Vba Read in Entire File Binary Array Bytes
Read entire file
Y'all are encouraged to solve this job co-ordinate to the task description, using whatsoever language you may know.
- Task
Load the unabridged contents of some text file as a single cord variable.
If applicable, hash out: encoding selection, the possibility of retentivity-mapping.
Of course, in do one should avoid reading an entire file at one time if the file is big and the job can be accomplished incrementally instead (in which case bank check File IO); this is for those cases where having the entire file is really what is wanted.
Contents
- 1 11l
- ii 8th
- 3 Activeness!
- iv Ada
- 4.1 Ada.Direct_IO
- 4.two POSIX.Memory_Mapping
- 5 ALGOL 68
- vi Amazing Hopper
- 7 AppleScript
- eight Arturo
- 9 ATS
- ten AutoHotkey
- 11 AutoIt
- 12 AWK
- 13 BaCon
- xiv BASIC
- 14.1 Commodore BASIC
- 15 BBC Basic
- 16 Bracmat
- 17 Brainf***
- 18 Brat
- 19 C
- nineteen.1 Retentiveness map
- twenty C#
- 21 C++
- 22 Clojure
- 23 CMake
- 24 Mutual Lisp
- 25 Crystal
- 26 D
- 27 Delphi
- 28 Déjà Vu
- 29 Due east
- 30 Elixir
- 31 Emacs Lisp
- 32 Erlang
- 33 Euphoria
- 34 F#
- 35 Factor
- 36 Fantom
- 37 Along
- 38 Fortran
- 38.1 Intel Fortran on Windows
- 39 FreeBASIC
- twoscore Frink
- 41 FutureBasic
- 42 Gambas
- 43 GAP
- 44 Genie
- 45 Go
- 46 Bully
- 47 GUISS
- 48 Haskell
- 49 Icon and Unicon
- 50 Inform vii
- 51 J
- 52 Coffee
- 53 JavaScript
- 54 jq
- 55 Jsish
- 56 Julia
- 57 KAP
- 58 Kotlin
- 59 LabVIEW
- 60 Lang5
- 61 Lasso
- 62 LFE
- 63 Liberty BASIC
- 64 Lingo
- 65 LiveCode
- 66 Lua
- 67 M2000 Interpreter
- 68 M4
- 69 Make
- 70 Maple
- 71 Mathematica/Wolfram Language
- 72 MATLAB / Octave
- 73 Mercury
- 74 Microsoft Pocket-sized Basic
- 75 Nanoquery
- 76 Neko
- 77 NetRexx
- 78 NewLISP
- 79 Nim
- 80 Objeck
- 81 Objective-C
- 82 OCaml
- 83 Ol
- 84 ooRexx
- 84.1 version 1
- 84.2 version 2 EXECIO
- 85 OxygenBasic
- 86 Oz
- 87 Panda
- 88 PARI/GP
- 89 Pascal
- ninety Perl
- 90.1 Memory-mapping
- 91 Phix
- 92 PHP
- 93 PicoLisp
- 94 Expressway
- 95 PL/I
- 96 PowerShell
- 97 PureBasic
- 98 Python
- 99 Quackery
- 100 Q
- 101 R
- 102 Racket
- 103 Raku
- 104 Raven
- 105 REALbasic
- 106 REBOL
- 107 Retro
- 108 REXX
- 108.i using LINEIN
- 108.2 using CHARIN
- 109 Band
- 110 Ruby
- 111 Run BASIC
- 112 Rust
- 113 Scala
- 114 Scheme
- 115 Seed7
- 116 SenseTalk
- 117 Sidef
- 118 Smalltalk
- 119 SNOBOL4
- 120 Sparkling
- 121 SPL
- 122 Standard ML
- 123 Stata
- 124 Swift
- 125 Tcl
- 126 TUSCRIPT
- 127 TXR
- 128 UNIX Shell
- 129 Ursa
- 130 Vala
- 131 VBScript
- 132 Vedit macro language
- 133 Visual Bones
- 134 Visual Bones .Cyberspace
- 135 Wart
- 136 Wren
- 137 XPL0
- 138 Xtend
- 139 Yorick
- 140 zkl
11l [edit]
File(filename).read()
8th [edit]
The "slurp" word volition read the unabridged contents of the file into memory, every bit-is, and give a "buffer". The ">south" converts that to a string, once again "as-is"
"somefile.txt" f:slurp >s
Action! [edit]
proc MAIN()
char array STRING
open (one,"D:FILE.TXT",four,0)
inputsd(i,STRING)
close(1)
return
Ada [edit]
Ada.Direct_IO [edit]
Using Ada.Directories to outset inquire for the file size and and then Ada.Direct_IO to read the whole file in one clamper:
with Ada.Directories,
Ada.Direct_IO,
Ada.Text_IO;procedure Whole_File is
File_Name : String := "whole_file.adb";
File_Size : Natural := Natural (Ada.Directories.Size (File_Name) );subtype File_String is String ( 1 .. File_Size );
packet File_String_IO is new Ada.Direct_IO (File_String);File : File_String_IO.File_Type;
Contents : File_String;begin
File_String_IO.Open (File, Mode => File_String_IO.In_File,
Name => File_Name);
File_String_IO.Read (File, Item => Contents);
File_String_IO.Close (File);Ada.Text_IO.Put (Contents);
end Whole_File;
This kind of solution is limited a flake by the fact that the GNAT implementation of Ada.Direct_IO first allocates a re-create of the read object on the stack within Ada.Direct_IO.Read. On Linux yous can apply the command "limit stacksize 1024M" to increase the bachelor stack for your processes to 1Gb, which gives your program more than freedom to use the stack for allocating objects.
POSIX.Memory_Mapping [edit]
Mapping the whole file into the address infinite of your process then overlaying the file with a String object.
with Ada.Text_IO,
POSIX.IO,
POSIX.Memory_Mapping,
System.Storage_Elements;process Read_Entire_File is
apply POSIX, POSIX.IO, POSIX.Memory_Mapping;
utilise Organisation.Storage_Elements;Text_File : File_Descriptor;
Text_Size : Organisation.Storage_Elements.Storage_Offset;
Text_Address : Organisation.Address;begin
Text_File := Open (Name => "read_entire_file.adb",
Mode => Read_Only);
Text_Size := Storage_Offset (File_Size (Text_File) );
Text_Address := Map_Memory (Length => Text_Size,
Protection => Allow_Read,
Mapping => Map_Shared,
File => Text_File,
Offset => 0 );declare
Text : String ( ane .. Natural (Text_Size) );
for Text'Address employ Text_Address;
begin
Ada.Text_IO.Put (Text);
cease;Unmap_Memory (First => Text_Address,
Length => Text_Size);
Close (File => Text_File);
end Read_Entire_File;
Character encodings and their handling are non really specified in Ada. What Ada does specify is 3 different graphic symbol types (and corresponding string types):
- Graphic symbol - containing the set of ISO-8859-1 characters.
- Wide_Character - containing the set up of ISO-10646 BMP characters.
- Wide_Wide_Character - containing the full set up of ISO-10646 characters.
The GNU Ada compiler (GNAT) seems to read in text files as bytes, completely ignoring any operating system information on grapheme encoding. You can use -gnatW8 in Ada 2005 way to utilize UTF-eight characters in identifier names.
ALGOL 68 [edit]
In official ALGOL 68 a file is equanimous of pages, lines and characters, still for ALGOL 68 Genie and ELLA ALGOL 68RS this concept is not supported as they prefer the Unix concept of files being "flat", and hence contain only characters.
The book tin incorporate new pages and new lines, are non of any item grapheme fix, hence are system contained. The character set is set by a call to brand conv, eg brand conv(tape, ebcdic conv); - c.f. Character_codes for more than details.
In official/standard ALGOL 68 but:
MODE BOOK = FLEX [0] FLEX [0] FLEX [0] CHAR ; ¢ pages of lines of characters ¢
BOOK volume;FILE book file;
INT errno = open (volume file, "book.txt" , stand up in channel ) ;go(book file, book)
Once a "book" has been read into a book array it can still be associated with a virtual file and again exist accessed with standard file routines (such as readf, printf, putf, getf, new line etc). This means data can be directly manipulated from a array cached in "core" using transput (stdio) routines.
In official/standard ALGOL 68 only:
FILE cached book file;
associate (buried book file, volume)
Amazing Hopper [edit]
Hopper only stores 1 BM of characters for each string variable. If the file to be read "all at in one case" exceeds that size, the file can be read, and every 1MB saved in a row of a dynamic array of strings, using the Push pedagogy for each portion read. In this mode, it is possible to work with portions of a file.
For at present, only a simple version is shown.
#include <hopper.h>main:
south=""
load str ("archivo.txt") (s)
println ( "File loaded:\n",s )
exit(0)
File loaded: RX/RY,A,B,C,D,E,F,G,H,I,J fila 1,1,two,iii,4,5,half dozen,7.998,8,9.034,ten fila 2,x,20,xxx,40,l,lx,70,80,90,100 fila 3,100,200,300.5,400,500,600,700,800,900,1000 fila 4,5,10,15,twenty,25,thirty,35,twoscore,45,50 fila five,a,b,c,d,e,f,k,h,i,j fila 6,1,2,3,iv,5,6,7,8,9,x
AppleScript [edit]
set up pathToTextFile to ( ( path to desktop folder as string ) & "testfile.txt" )-- short way: open, read and close in ane step
set up fileContent to read file pathToTextFile-- long way: open a file reference, read content and close access
ready fileRef to open for access pathToTextFile
set fileContent to read fileRef
shut access fileRef
Arturo [edit]
contents: read "input.txt"
ATS [edit]
There are various functions in the ATS prelude, including this one that is based on fread(iii) and returns Strptr1:
val s = fileref_get_file_string (stdin_ref)
Because Strptr1 is a NUL-terminated string, fileref_get_file_string cannot be used for data that contains bytes equal to zilch.
AutoHotkey [edit]
fileread , varname, C:\filename.txt ; adding "MsgBox %varname%" (no quotes) to the side by side line will display the file contents.
This script works fine equally-is provided C:\filename.txt exists.
AutoIt [edit]
$fileOpen = FileOpen ( "file.txt" )
$fileRead = FileRead ( $fileOpen )
FileClose ( $fileOpen )
AWK [edit]
#!/usr/bin/awk -f
Brainstorm {
## empty record separate,
RS="";
## read line (i.e. whole file) into $0
getline;
## print line number and content of line
print "=== line " NR,":",$0;
}
{
## no further line is read printed
print "=== line " NR,":",$0;
}
#!/usr/bin/awk -f@include "readfile"
Begin {
str = readfile( "file.txt" )
impress str}
BaCon [edit]
For string data:
content$ = LOAD$(filename$)
For retentivity mapped binary data:
binary = BLOAD ( "somefile.bin" )
Print "First two bytes are: ", PEEK ( binary ), " ", PEEK ( binary+1 )
FREE binary
BASIC [edit]
Whether or not various encodings are supported is implementation-specific.
DIM f AS Cord
OPEN "file.txt" FOR BINARY AS 1
f = Infinite$ ( LOF ( 1 ) )
Get #one , i , f
Close one
Commodore BASIC [edit]
ten rem load the unabridged contents of some text file every bit a unmarried string variable.
twenty rem should avert reading an entire file at once if the file is large
30 rem ================================
40 print chr$(14) : rem switch to upper+lowercase character set
50 open four,8,4,"data.txt,seq,read"
sixty n=0
70 for i=0 to i
80 get#4,10$
90 i=st and 64 : rem check for 'finish-of-file'
100 if i=0 then a$=a$+x$ : n=due north+1
110 if n=255 then i=ane : rem max cord length is 255 only
120 next
130 close 4
140 end
BBC Bones [edit]
In BBC BASIC for Windows and Brandy BASIC the maximum string length is 65535 characters.
file% = OPENIN("input.txt")
strvar$ = ""
WHILE Non EOF#file%
strvar$ += CHR$(BGET#file%)
ENDWHILE
CLOSE #file% API version:
file% = OPENIN("input.txt")
strvar$ = STRING$(EXT#file%, " ")
SYS "ReadFile", @hfile%(file%), !^strvar$, EXT#file%, ^temp%, 0
CLOSE #file% Bracmat [edit]
become'(filename,STR):?myString
Brainf*** [edit]
While the language certainly doesn't back up strings in the traditional sense, relaxing the definition to mean any face-to-face sequence of null-terminated bytes permits a reasonable facsimile. This cat program eschews the simpler byte-by-byte approach (,[.,]) to demonstrate the technique.
> Keep cell 0 at 0 every bit a sentinel value
, [ > , ] Read into successive cells until EOF
< [ < ] Go all the way back to the commencement
> [ . > ] Print successive cells while nonzero
$ curl -Ls rosettacode.org | bf ">,[>,]<[<]>[.>]" <!DOCTYPE html> ... </html> Tape: [0, 60, 33, 68, 79, 67, 84, 89, 80, 69, 32, 104, 116, 109, 108, 62, 10 ... 60, 47, 104, 116, 109, 108, 62, x, 0]
Brat [edit]
include :filefile.read file_name
C [edit]
It is not possible to specify encodings: the file is read every bit binary data (on some organisation, the b flag is ignored and at that place's no difference between "r" and "rb"; on others, information technology changes the mode the "new lines" are treated, merely this should not affect fread)
#include <stdio.h>
#include <stdlib.h>int main( )
{
char *buffer;
FILE *fh = fopen ( "readentirefile.c" , "rb" ) ;
if ( fh != Naught )
{
fseek (fh, 0L , SEEK_END) ;
long s = ftell (fh) ;
rewind (fh) ;
buffer = malloc (s) ;
if ( buffer != Naught )
{
fread (buffer, south, 1 , fh) ;
// we can now shut the file
fclose (fh) ; fh = NULL;// exercise something, east.g.
fwrite (buffer, south, 1 , stdout) ;gratuitous (buffer) ;
}
if (fh != NULL) fclose (fh) ;
}
return EXIT_SUCCESS;
}
Memory map [edit]
Nosotros can retentivity-map the file.
#include <stdio.h>
#include <stdlib.h>
#include <sys/mman.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <fcntl.h>int master( )
{
char *buffer;
struct stat s;int fd = open( "readentirefile_mm.c" , O_RDONLY) ;
if (fd < 0 ) return EXIT_FAILURE;
fstat(fd, &s) ;
/* PROT_READ disallows writing to buffer: volition segv */
buffer = mmap( 0 , s.st_size , PROT_READ, MAP_PRIVATE, fd, 0 ) ;if ( buffer != ( void * ) - 1 )
{
/* exercise something */
fwrite (buffer, s.st_size , 1 , stdout) ;
munmap(buffer, s.st_size ) ;
}close(fd) ;
return EXIT_SUCCESS;
}
Memory map on Windows. Run across MSDN, starting with File Mapping. In practice, information technology would be necessary to check for errors, and to accept care of large files. Also, this instance is using a view on the whole file, but it's possible to create a smaller view.
#include <windows.h>
#include <stdio.h>int main( ) {
HANDLE hFile, hMap;
DWORD filesize;
char *p;hFile = CreateFile( "mmap_win.c" , GENERIC_READ, 0 , Cypher, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, Aught) ;
filesize = GetFileSize(hFile, NULL) ;
hMap = CreateFileMapping(hFile, NULL, PAGE_READONLY, 0 , 0 , Nil) ;
p = MapViewOfFile(hMap, FILE_MAP_READ, 0 , 0 , 0 ) ;fwrite (p, filesize, 1 , stdout) ;
CloseHandle(hMap) ;
CloseHandle(hFile) ;
return 0 ;
}
C# [edit]
using System.IO ;class Plan
{
static void Main( string [ ] args)
{
var fileContents = File. ReadAllText ( "c:\\autoexec.bat" ) ;
// Can optionally take a second parameter to specify the encoding, e.one thousand. File.ReadAllText("c:\\autoexec.bat", Encoding.UTF8)
}
}
C++ [edit]
#include <iostream>
#include <fstream>
#include <string>
#include <iterator>int main( )
{
if (std:: ifstream infile( "sample.txt" ) )
{
// construct string from iterator range
std:: cord fileData(std:: istreambuf_iterator < char > (infile), std:: istreambuf_iterator < char > ( ) ) ;cout << "File has " << fileData.size ( ) << "chars\n" ;
// don't need to manually shut the ifstream; information technology will release the file when it goes out of scope
render 0 ;
}
else
{
std:: cout << "file non found!\north" ;
return i ;
}
}
Clojure [edit]
The core function slurp does the play tricks; y'all tin specify an encoding as an optional second argument:
(slurp "myfile.txt" )
(slurp "my-utf8-file.txt" "UTF-viii" )
CMake [edit]
Sets a variable named cord.
file (READ /etc/passwd string)
This works with text files, but fails with binary files that incorporate NUL characters. CMake truncates the string at the get-go NUL grapheme, and at that place is no way to detect this truncation.
The only manner to read binary files is to utilize the HEX keyword to convert the unabridged file to a hexadecimal string.
file (READ /etc/pwd.db string HEX)
Common Lisp [edit]
The following will read and store the file as a sequence of bytes.
( defun file-cord (path)
(with-open up-file (stream path)
( allow ( (information (make-string (file-length stream) ) ) )
(read-sequence data stream)
data) ) )
The macro with-open up-file could be passed :external-format :utf-viii on some implementations (which it would laissez passer on to open) so that reading would occur by unicode character merely (file-length stream) would continue to return the number of bytes, not characters, necessary for storing it.
Crystal [edit]
The simplest fashion to read an entire file to a string is by using File.read:
content = File.read ( "input.txt" )
puts content
Lorem ipsum dolor sit amet, consectetur adipiscing elit nullam.
The encoding is UTF-8 by default, only it can be explicitly specified:
content = File.read ( "input.txt", "UTF-sixteen" )
or
content = File.read ( "input.txt", encoding: "UTF-16" )
File.open up allows for more options and closes the file implicitly. Combine information technology with File#gets_to_end to read the entire file:
content = File.open up ( "input.txt" ) do |file|
file.gets_to_end
stop
Or no implicit closing at all with File.new:
file = File.new ( "input.txt" )
content = file.gets_to_end
file.shut
D [edit]
import std.file : read, readText;void master( ) {
// To read a whole file into a dynamic array of unsigned bytes:
auto information = cast ( ubyte [ ] )read( "unixdict.txt" ) ;// To read a whole file into a validated UTF-viii cord:
cord txt = readText( "unixdict.txt" ) ;
}
Delphi [edit]
Using TStringList
program ReadAll;{$APPTYPE CONSOLE}
uses Classes;
var
i: Integer ;
lList: TStringList;
brainstorm
lList : = TStringList. Create ;
try
lList. LoadFromFile ( 'c:\input.txt' ) ;
// Write everything at once
Writeln (lList. Text ) ;
// Write 1 line at a time
for i : = 0 to lList. Count - ane do
Writeln (lList[i] ) ;
finally
lList. Free ;
end ;
end .
Works with: Delphi 2010 and above
program ReadAll;{$APPTYPE Console}
uses
SysUtils, IOUtils;begin
// with default encoding:
Writeln (TFile. ReadAllText ( 'C:\autoexec.bat' ) ) ;
// with encoding specified:
Writeln (TFile. ReadAllText ( 'C:\autoexec.bat' , TEncoding. ASCII ) ) ;
Readln;
end .
Déjà Vu [edit]
To get a string from a file, you demand to explicitly decode the binary blob that is read. Currently merely UTF-8 is supported past vu.
local :filecontents !decode!utf-eight !read "file.txt"
E [edit]
<file:foo.txt >.getText ( )
The file is assumed to exist in the default encoding.
Elixir [edit]
2 solutions in the FileReader namespace. File returns a tuple: {:ok, file} is successful or {:error, reason} if unsuccessful. Errors tin can be defenseless and turned into fault strings via Erlang'south :file.format_error office.
defmodule FileReader practice
# Read in the file
def read(path) do
case File.read(path) do
{:ok, body} ->
IO.audit body
{:error,reason} ->
:file.format_error(reason)
stop
end# Open up the file path, and so read in the file
def bit_read(path) practise
case File.open(path) practise
{:ok, file} ->
# :all tin can be replaced with :line, or with a positive integer to specify the number of characters to read.
IO.read(file,:all)
|> IO.inspect
{:mistake,reason} ->
:file.format_error(reason)
end
cease
terminate
Emacs Lisp [edit]
insert-file-contents does all Emacs' usual grapheme coding, magic file names, decompression, format decoding, etc. (insert-file-contents-literally can avert that if unwanted.)
( setq my-variable (with-temp-buffer
(insert-file-contents "foo.txt" )
(buffer-cord) ) )
(If an existing buffer is visiting the file, maybe nonetheless unsaved, information technology may be helpful to take its contents instead of re-reading the file. find-buffer-visiting tin can locate such a buffer.)
Erlang [edit]
{ok, B } = file:read_file ( "myfile.txt" ) .
This reads the entire file into a binary object.
Euphoria [edit]
Euphoria cannot natively handle multibyte graphic symbol encodings. The openEuphoria team is/was working on supporting it. It may take been implemented past now.
role load_file( sequence filename)
integer fn,c
sequence data
fn = open (filename, "r" ) -- "r" for text files, "rb" for binary files
if (fn = - i ) then render { } end if -- failed to open up the filedata = { } -- init to empty sequence
c = getc (fn) -- prime the char buffer
while (c != - one ) practice -- while non EOF
data &= c -- append each character
c = getc (fn) -- next char
cease whileclose (fn)
return data
terminate function
F# [edit]
// read entire file into variable using default arrangement encoding or with specified encoding
open System.IO
let data = File.ReadAllText (filename)
allow utf8 = File.ReadAllText (filename, Organisation.Text.Encoding.UTF8 )
Factor [edit]
USING: io.encodings.ascii io.encodings.binary io.files ;! to read unabridged file equally binary
"foo.txt" binary file-contents! to read unabridged file every bit lines of text
"foo.txt" ascii file-lines
Fantom [edit]
Provide the filename to read from as a command-line parameter.
class ReadString
{
public static Void main (Str[] args)
{
Str contents := File(args[0].toUri).readAllStr
echo ("contents: $contents")
}
}
Forth [edit]
s" foo.txt" slurp-file ( str len )
Fortran [edit]
Reading the entire source file in memory, then printing it. Information technology relies on the SIZE attribute of the INQUIRE argument returning the size of the file in bytes, whereupon the Allocate statement prepares a variable of the correct size to receive the whole content. This SIZE facility was introduced with F2003, and prior to F90 there was no ALLOCATE facility: the size of variables was stock-still at compile time.
program read_file
implicit none
integer :: northward
character ( : ), allocatable :: due southopen( unit of measurement = x, file = "read_file.f90", action = "read", &
form = "unformatted", admission = "stream" )
inquire( unit = 10, size =n)
classify ( character (northward) :: s )
read( 10 ) southward
close( 10 )print "(A)", s
end programme
Intel Fortran on Windows [edit]
Here is a solution using the Windows API to create a retentivity map of a file. It is used to print the source code of the program on the console.
plan file_win
use kernel32
use iso_c_binding
implicit noneinteger (HANDLE) :: hFile, hMap, hOutput
integer (DWORD) :: fileSize
integer (LPVOID) :: ptr
integer (LPDWORD) :: charsWritten
integer (BOOL) :: southhFile = CreateFile( "file_win.f90" // c_null_char, GENERIC_READ, &
0, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, Null)
filesize = GetFileSize(hFile, Cypher)
hMap = CreateFileMapping(hFile, Cipher, PAGE_READONLY, 0, 0, NULL)
ptr = MapViewOfFile(hMap, FILE_MAP_READ, 0, 0, 0 )hOutput = GetStdHandle(STD_OUTPUT_HANDLE)
s = WriteConsole(hOutput, ptr, fileSize, transfer (c_loc(charsWritten), 0_c_intptr_t), Nil)
s = CloseHandle(hMap)
due south = CloseHandle(hFile)
end program
FreeBASIC [edit]
' FB i.05.0 Win64Open "input.txt" For Input Encoding "ascii" As #1
Dim fileLen Equally LongInt = Lof ( i ) '' get file length in bytes
Dim buffer As Cord = Infinite (fileLen) '' allocate a string of size 'fileLen' bytes
Get #i, ane, buffer '' read all data from start of file into the buffer
Print buffer '' print to console
buffer = "" '' release retention used past setting buffer to empty
Close #1
Sleep
Frink [edit]
The read[URL] part reads the entire contents of a URL. The encoding can be specified if necessary.
a = read["file:yourfile.txt"]
b = read["file:yourfile.txt", "UTF-eight"]
FutureBasic [edit]
Notation: This code goes beyond simply specifying the file to open up. Information technology includes a dialog window that allows the user to select a text file to read. Depending on system memory, equally many as iv.2 billion characters can be read. The file contents are placed in a convenient console window with automatic save as, copy and paste, select all and undo commands. (Did I mention that FutureBasic -- or FB as developers prefer to phone call it -- is handy for Macintosh development!) Of course, the programmer is gratis to lawmaking his own window and bill of fare options.
include "ConsoleWindow"local fn ReadTextFile
dim as CFURLRef fileRef
dim as Handle h
dim as CFStringRef cfStr : cfStr = Zippo
dim as long fileLenif ( files$( _CFURLRefOpen, "TEXT", "Select text file...", @fileRef ) )
open "i", 2, fileRef
fileLen = lof( two, 1 )
h = fn NewHandleClear( fileLen )
if ( h )
read file ii, [h], fileLen
close #2
cfStr = fn CFStringCreateWithBytes( _kCFAllocatorDefault, #[h], fn GetHandleSize(h), _kCFStringEncodingMacRoman, _false )
fn DisposeH( h )
stop if
else
// User canceled
end iffn HIViewSetText( sConsoleHITextView, cfStr )
CFRelease( cfStr )
stop fnfn ReadTextFile
This tin be shortened considerably by wrapping Objective-C code:
include "ConsoleWindow" local fn ReadTextFile dim every bit CFURLRef fileRef dim every bit CFStringRef cfStr : cfStr = NULL if ( files$( _CFURLRefOpen, "TEXT", "Select text file...", @fileRef ) ) BeginCCode cfStr = (CFStringRef)[[NSString alloc] initWithContentsOfURL:(NSURL *)fileRef encoding:NSUTF8StringEncoding fault:zilch]; EndC fn HIViewSetText( sConsoleHITextView, cfStr ) CFRelease( cfStr ) else // User canceled end if finish fn fn ReadTextFile
Gambas [edit]
Public Sub Form_Open( )
Dim sFile As StringsFile = File.Load ( User.home &/ "file.txt" )
End
GAP [edit]
InputTextFile("input.txt");
s := ReadAll(f);; # two semicolons to hibernate the result, which may exist long
CloseStream(f); Genie [edit]
[indent= four ]
/*
Read entire file, in Genievalac readEntireFile.gs
./readEntireFile [filename]
*/init
fileName: string
fileContents: string
fileName = (args[ one ] is cypher ) ? "readEntireFile.gs" : args[ 1 ]try
FileUtils.get_contents (fileName, out fileContents)
except exc:Mistake
impress "Error: %s", exc.message
returnstdout.printf ( "%d bytes read from %s\due north", fileContents.length, fileName)
prompt$ valac readEntireFile.gs prompt$ ./readEntireFile 443 bytes read from readEntireFile.gs prompt$ ./readEntireFile nofile Error: Failed to open up file ?nofile?: No such file or directory prompt$ ./readEntireFile leapYear.gs 291 bytes read from leapYear.gs
Become [edit]
Go has practiced back up for working with strings as UTF-eight, merely there is no requirement that strings be UTF-eight and in fact they tin can hold capricious data. ioutil.ReadFile returns the contents of the file unaltered as a byte assortment. The conversion in the side by side line from byte assortment to cord as well makes no changes to the data. In the example below sv will have an exact re-create of the data in the file, without regard to encoding.
import "io/ioutil"data, err := ioutil.ReadFile(filename)
sv := cord (information)
Go besides supports memory mapped files on OSes with a mmap syscall (eastward.g. Unix-like). The following prints the contents of "file". (The included "build constraint" prevents this from existence compiled on architectures known to lack syscall.Mmap, another source file with the opposite build constraint could utilise ioutil.ReadFile as above).
// +build !windows,!plan9,!nacl // These lack syscall.Mmappackage main
import (
"fmt"
"log"
"os"
"syscall"
)func main() {
f, err := os.Open( "file" )
if err != cypher {
log.Fatal(err)
}
fi, err := f.Stat()
if err != nil {
log.Fatal(err)
}
data, err := syscall.Mmap( int (f.Fd()), 0 , int (fi.Size()),
syscall.PROT_READ, syscall.MAP_PRIVATE)
if err != nil {
log.Fatal(err)
}
fmt.Println( cord (data))
}
Cracking [edit]
def fileContent = new File ( "c:\\file.txt" ).text
GUISS [edit]
Offset,Programs,Accessories,Notepad,Menu:File,Open,Doubleclick:Icon:Notes.TXT,Button:OK
Haskell [edit]
In the IO monad:
do text <- readFile filepath
-- do stuff with text
Notation that readFile is lazy. If you lot desire to ensure the unabridged file is read in at once, before any other IO deportment are run, try:
eagerReadFile :: FilePath -> IO String
eagerReadFile filepath = do
text <- readFile filepath
last text `seq` return text
Icon and Unicon [edit]
The first code snippet below reads from stdin direct into the string fs, preserving line separators (if whatever) and reading in large chunks.
every (fs := "" ) ||:= | reads ( 1000000 )
The 2nd code snippet beneath performs the same performance using an intermediate list fL and applying a function (east.g. FUNC) to each line. Use this class when you lot demand to perform boosted string functions such as 'trim' or 'map' on each line. This avoids unnecessary garbage collections which will occur with larger files. The list tin be discarded when done. Line separators are mapped into newlines.
every put (fL := [ ] ,|FUNC( read ( ) ) )
every (fs := "" ) ||:= !fL || "\northward"
fL := & nix
Inform seven [edit]
File access is sandboxed by the interpreter, so this solution essentially requires that the file accept been previously written by an Inform program running from the same location under the same interpreter.
Dwelling is a room.The File of Testing is called "exam".
When play begins:
say "[text of the File of Testing]";
end the story.
J [edit]
require 'files' NB. not needed for J7 & later
var=: freads 'foo.txt'
To retentivity map the file:
require 'jmf'
JCHAR map_jmf_ 'var';'foo.txt'
Circumspection: updating the value of the retentiveness mapped variable will update the file, and this characteristic remains when the variable'southward value is passed, unmodified, to a verb which modifies its own local variables.
Coffee [edit]
There is no unmarried method to do this in Java 6 and below (probably considering reading an entire file at once could make full upward your retentiveness quickly), so to do this you could merely append the contents as you read them into a buffer.
import coffee.io.BufferedReader ;
import java.io.FileReader ;
import coffee.io.IOException ;public grade ReadFile {
public static void principal( Cord [ ] args) throws IOException {
String fileContents = readEntireFile( "./foo.txt" ) ;
}private static String readEntireFile( String filename) throws IOException {
FileReader in = new FileReader (filename) ;
StringBuilder contents = new StringBuilder( ) ;
char [ ] buffer = new char [ 4096 ] ;
int read = 0 ;
do {
contents.append (buffer, 0, read) ;
read = in.read (buffer) ;
} while (read >= 0 ) ;
in.close ( ) ;
render contents.toString ( ) ;
}
}
I can memory-map the file in Java, simply there's little to proceeds if one is to create a String out of the file:
import java.nio.channels.FileChannel.MapMode ;
import java.nio.MappedByteBuffer ;
import java.io.RandomAccessFile ;
import coffee.io.IOException ;
import java.io.File ;public course MMapReadFile {
public static void chief( Cord [ ] args) throws IOException {
MappedByteBuffer vitrify = getBufferFor( new File (args[ 0 ] ) ) ;
String results = new String (buff.asCharBuffer ( ) ) ;
}public static MappedByteBuffer getBufferFor( File f) throws IOException {
RandomAccessFile file = new RandomAccessFile (f, "r" ) ;MappedByteBuffer buffer = file.getChannel ( ).map (MapMode.READ_ONLY, 0, f.length ( ) ) ;
file.close ( ) ;
return buffer;
}
}
or one tin take a shortcut:
String content = new Scanner( new File ( "foo" ), "UTF-8" ).useDelimiter ( "\\A" ).adjacent ( ) ;
this works because Scanner will search the file for a delimiter and return everything before that. \A is the beginning of the file, which it will never notice until the end of the file is reached.
Coffee vii added coffee.nio.file.Files which has ii methods for accomplishing this chore: Files.readAllLines and Files.readAllBytes:
import java.util.List ;
import java.nio.charset.Charset ;
import java.nio.file.* ;public class ReadAll {
public static List < String > readAllLines( Cord filesname) {
Path file = Paths.get (filename) ;
return Files.readAllLines (file, Charset.defaultCharset ( ) ) ;
}public static byte [ ] readAllBytes( String filename) {
Path file = Paths.go (filename) ;
render Files.readAllBytes (file) ;
}
}
JavaScript [edit]
This works in IExplorer or a standalone js file. Annotation the similarity to the VBScript code.
var fso= new ActiveXObject( "Scripting.FileSystemObject" ) ;
var f=fso.OpenTextFile ( "c:\\myfile.txt" , 1 ) ;
var s=f.ReadAll ( ) ;
f.Close ( ) ;
try {alert(south) } catch (e) {WScript.Echo (s) }
The post-obit works in all browsers, including IE10.
var file = certificate.getElementById ( "fileInput" ).files.item ( 0 ) ; //a file input element
if (file) {
var reader = new FileReader( ) ;
reader.readAsText (file, "UTF-eight" ) ;
reader.onload = loadedFile;
reader.onerror = errorHandler;
}
function loadedFile(effect) {
var fileString = effect.target.outcome ;
alert(fileString) ;
}
function errorHandler(result) {
alert(issue) ;
}
jq [edit]
The . filter volition read in a file of raw text, e.one thousand. if the file is named input.txt and nosotros wanted to emit it as a single JSON string:
jq -R -s . input.txt
In practice, this is probably non very useful. It would be more than typical to collect the raw lines into an array of JSON strings.
If it is known that the lines are delimited by a single "newline" character, then ane could simply pipe from one jq command to another:
jq -R . input.txt | jq -s .
Equivalently:
jq -R -southward 'split("\n")' input.txt Other cases can be similarly handled.
Jsish [edit]
var contents = File.read ( "filename" )
From the shell:
prompt$ jsish Jsish interactive: see 'help [cmd]' # var contents = File.read("README") variable # contents "Jsi is a small javascript interpreter for embedded-C development. Internally Jsi emulates Tcl. The parser and execution engine originate from quad_wheel, It is existence developed under an MIT license. " Julia [edit]
The built-in function read, when used with a second argument of Cord, reads the whole file named by its kickoff statement into a string (assuming UTF8 encoding).
read("/devel/myfile.txt", String) # read file into a string Alternatively, for files that are also big to read into memory without swapping, in that location are a diversity of ways to memory-map the file, for instance as an array of bytes:
A = Mmap.mmap(open("/devel/myfile.txt"), Assortment{UInt8,ane}) KAP [edit]
The built-in function io:readFile volition read the entire content of the file as a cord:
content ← io:readFile "file.txt"
The function io:read tin can be used to return all the lines in the file as an assortment:
content ← io:read "file.txt"
Kotlin [edit]
import coffee.io.Filefun main(args: Array<String> ) {
println(File( "unixdict.txt" ).readText (charset = Charsets.UTF_8 ) )
}
LabVIEW [edit]
This image is a VI Snippet, an executable image of LabVIEW code. The LabVIEW version is shown on the top-right mitt corner. Y'all can download it, and so drag-and-drop it onto the LabVIEW block diagram from a file browser, and it will appear as runnable, editable code.
Lang5 [edit]
'foo.txt slurp
Lasso [edit]
By default, cord objects, which are always Unicode, are created with the supposition that the file contains UTF-8 encoded data. This assumption can be changed by settings the file objects's graphic symbol encoding value. When reading the data as a bytes object, the unaltered file information is returned.
local(f) = file('foo.txt')
#f->readString LFE [edit]
( set `#(ok ,information) (file: read_file "myfile.txt" ) )
Liberty Basic [edit]
filedialog "Open up a Text File" , "*.txt" ,file$
if file$<> "" then
open up file$ for input equally # i
unabridged$ = input$( # one , lof ( # one ) )
shut # 1
print entire$
finish if
Lingo [edit]
----------------------------------------
-- Reads whole file, returns cord
-- @param {string} tFile
-- @return {cord|false}
----------------------------------------
on readFile (tFile)
fp = xtra("fileIO").new()
fp.openFile(tFile, 1)
if fp.status() then render false
res = fp.readFile()
fp.closeFile()
return res
cease
LiveCode [edit]
Livecode offers 2 ways:
Using URL
put URL "file:///usr/share/dict/words" into tVar
put the number of lines of tVar
Using file open + read + close
local tFile,tLinecount
put "/usr/share/dict/words" into tFile
open file tFile for text read
read from file tFile until EOF
put the number of lines of it -- file contents held in "it" variable
close file tFile
Lua [edit]
--If the file opens with no problems, io.open will return a
--handle to the file with methods fastened.
--If the file does not exist, io.open will return null and
--an error message.
--assert will render the handle to the file if present, or
--it volition throw an error with the message returned second
--by io.open.
local file = assert ( io.open (filename) )
--Without wrapping io.open up in an affirm, local file would be null,
--which would cause an 'endeavour to alphabetize a zip value' fault when
--calling file:read.--file:read takes the number of bytes to read, or a string for
--special cases, such as "*a" to read the entire file.
local contents = file: read '*a'--If the file handle was local to the expression
--(ie. "assert(io.open(filename)):read'a'"),
--the file would remain open until its handle was
--garbage collected.
file:close( )
M2000 Interpreter [edit]
Module checkit {
\\ prepare a file
\\ Salve.Physician and Append.Doc to file, Load.Physician and Merge.Medico from file
document a$
a$={First Line
Second line
Third Line
Ελληνικά Greek Messages
}
Save.Physician a$, "checkthis.txt", 2 ' 2 for UTF-8Buffer1=Buffer("checkthis.txt")
Print Len(Buffer1)=Filelen("checkthis.txt")
b$=String$(Eval$(Buffer1, 0) as UTF8Dec)
Written report b$
openfile$=FILE$("text file","txt")
Merge.physician a$, openfile$
Edit.Doc a$
}
checkit
M4 [edit]
An approximation to file reading tin can be had past include() which reads a file as M4 input. If it'southward inside a define() then the input is captured equally a definition. But this is extremely limited since any macro names, parens, commas, quote characters etc in the file volition expand and upset the capture.
ascertain(`foo',include(`file.txt'))
defn(`foo')
defn(`foo')
Make [edit]
contents := $ ( shell true cat foo.txt)
This is from the GNU Make manual. Equally noted at that place, newlines are converted to spaces in the $(contents) variable. This might be adequate for files which are a list of words anyway.
Maple [edit]
First solution:
s1 := readbytes( "file1.txt", infinity, TEXT ):
2d solution:
s2 := FileTools:-Text:-ReadFile( "file2.txt" ):
Mathematica/Wolfram Linguistic communication [edit]
Import["filename","Cord"]
MATLAB / Octave [edit]
fid = fopen ( 'filename','r' );
[str,count] = fread (fid, [ 1,inf ], 'uint8=>char' ); % s will be a graphic symbol array, count has the number of bytes
fclose (fid);
Mercury [edit]
:- module read_entire_file.
:- interface.:- import_module io.
:- pred master(io::di, io::uo) is det.:- implementation.
:- import_module string.principal(!IO) :-
io.open_input("file.txt", OpenResult, !IO),
(
OpenResult = ok(File),
io.read_file_as_string(File, ReadResult, !IO),
(
ReadResult = ok(FileContents),
io.write_string(FileContents, !IO)
;
ReadResult = fault(_, IO_Error),
io.stderr_stream(Stderr, !IO),
io.write_string(Stderr, io.error_message(IO_Error) ++ "\n", !IO)
)
;
OpenResult = fault(IO_Error),
io.stderr_stream(Stderr, !IO),
io.write_string(Stderr, io.error_message(IO_Error) ++ "\n", !IO)
).
Microsoft Small Bones [edit]
v=File.ReadContents(filename)
Nanoquery [edit]
import Nanoquery.IO
contents = new(File, "example.txt").readAll()
Neko [edit]
/**
Read entire file
Tectonics:
nekoc read-entire-file.neko
neko read-entire-file
*/var file_contents = $loader.loadprim ( "[email protected]_contents", i );
try {
var entire_file = file_contents( "read-entire-file.neko" );
$print( "Read: ", $ssize(entire_file), " bytes\northward" );
} catch e {
$impress( "Exception: ", e, "\n" );
}
prompt$ nekoc read-entire-file.neko prompt$ neko read-entire-file.n Read: 325 bytes
NetRexx [edit]
/* NetRexx */
options supervene upon format comments java crossref symbols nobinaryparse arg inFileName .
if inFileName = '' | inFileName = '.' so inFileName = './information/dwarfs.json'
fileContents = slurp(inFileName)
say fileContentsreturn
-- Slurp a file and return contents as a Rexx string
method slurp(inFileName) public static returns Rexxslurped = Rexx naught
slurpStr = StringBuilder( )
ioBuffer = byte[ 1024 ]
inBytes = int 0practise
inFile = File(inFileName)
inFileIS = BufferedInputStream(FileInputStream(inFile) )loop label ioLoop until inBytes = -one
slurpStr.suspend (Cord(ioBuffer, 0, inBytes) )
inBytes = inFileIS.read (ioBuffer)
end ioLoopcatch exFNF = FileNotFoundException
exFNF.printStackTrace
take hold of exIO = IOException
exIO.printStackTrace
finally
do
inFileIS.close ( )
catch ex = IOException
ex.printStackTrace
stop
endslurped = Rexx(slurpStr.toString )
return slurped
NewLISP [edit]
( read-file "filename" )
Nim [edit]
To read the content of a file specified by its proper name:
readFile(filename)
To read the contents of an opened file:
readAll(f)
Objeck [edit]
string := FileReader-> ReadFile ( "in.txt" ) ;
Objective-C [edit]
/*** 0. PREPARATION */
// We demand a text file to read; let's redirect a C string to a new file
// using the shell by way of the stdlib arrangement() function.
system ( "repeat \"Hello, World!\" > ~/HelloRosetta" );/*** 1. THE Job */
// Instantiate an NSString which describes the filesystem location of
// the file nosotros will be reading.
NSString *filePath = [NSHomeDirectory( ) stringByAppendingPathComponent: @ "HelloRosetta" ];// The selector we're going to use to complete this job,
// stringWithContentsOfFile:encoding:error, has an optional `error'
// parameter which tin exist used to return data about whatever
// errors it might run into. Information technology's optional, but we'll create an NSError
// anyways to demonstrate best practice.
NSError *anError;// And finally, the task: read and shop the contents of a file as an
// NSString.
NSString *aString = [ NSString stringWithContentsOfFile:filePath
encoding:NSUTF8StringEncoding
error:&anError];// If the file read was unsuccessful, display the mistake description.
// Otherwise, display the NSString.
if ( !aString) {
NSLog( @ "%@", [anError localizedDescription] );
} else {
NSLog( @ "%@", aString);
}
OCaml [edit]
For virtually uses we can utilise this part:
let load_file f =
let ic = open_in f in
let n = in_channel_length ic in
permit s = Bytes.create northward in
really_input ic s 0 n;
close_in ic;
(s)
Nosotros tin replace the last line with the ane beneath if we want to return a type string instead of bytes:
(Bytes.unsafe_to_string southward)
There is no problem reading an entire file with the function really_input considering this function is implemented appropriately with an internal loop, but it can but load files which size is equal or inferior to the maximum length of an ocaml string. This maximum size is available with the variable Sys.max_string_length. On 32 bit machines this size is most 16Mo.
To load bigger files several solutions exist, for example create a structure that contains several strings where the contents of the file can be separate. Or some other solution that is often used is to employ a bigarray of chars instead of a string:
type big_string =
( char, Bigarray .int8_unsigned_elt, Bigarray .c_layout) Bigarray .Array1.t
The function beneath returns the contents of a file with this type big_string, and it does so with "memory-mapping":
allow load_big_file filename =
let fd = Unix .openfile filename [ Unix .O_RDONLY] 0o640 in
let len = Unix .lseek fd 0 Unix .SEEK_END in
let _ = Unix .lseek fd 0 Unix .SEEK_SET in
let shared = false in (* modifications are done in memory only *)
allow bstr = Bigarray .Array1.map_file fd
Bigarray . char Bigarray .c_layout shared len in
Unix .close fd;
(bstr)
So the length of the information can exist get with Bigarray.Array1.dim instead of String.length, and we tin can access to a given char with the syntactic sugar bstr.{i} (instead of str.[i]) as shown in the minor slice of code beneath (similar to the cat control):
permit ( ) =
let bstr = load_big_file Sys .argv. ( one ) in
let len = Bigarray .Array1.dim bstr in
for i = 0 to pred len do
let c = bstr. {i} in
print_char c
done
Ol [edit]
( define content (bytes-> cord
(vec-iter
(file-> vector "file.txt" ) ) ) )(impress content)
ooRexx [edit]
version 1 [edit]
file = 'c:\test.txt'
myStream = . stream~new(file)
myString = myStream~charIn (,myStream~chars )
Streams are opened on demand and closed when the script finishes. It is possible if you wish to open and close the streams explicitly
file = 'c:\test.txt'
myStream = . stream~new(file)
if mystream~open( 'read' ) = 'Set:'
then do
myString = myStream~charIn (,myStream~chars )
myStream~shut
end
version ii EXECIO [edit]
One can also use EXECIO as it is known from VM/CMS and MVS/TSO:
address hostemu 'execio * diskr "./st.in" (finis stem in.'
Say in.0 'lines in file st.in'
v=''
Do i=1 To in.0
Say i '>'in.i'<'
v=v||in.i
Stop
say 'v='v
::requires "hostemu" LIBRARY
E:\>rexx ref 6 lines in file st.in one >accost hostemu 'execio * diskr "./st.in" (finis stem in.'< 2 >Say in.0< 3 >Do i=i To in.0< four > Say i '>'in.i'<'< 5 > End< 6 >::requires "hostemu" LIBRARY< v=address hostemu 'execio * diskr "./st.in" (finis stem in.'Say in.0Do i=1 To in .0 Say i '>'in.i'<' Stop::requires "hostemu" LIBRARY
OxygenBasic [edit]
2 Formats:
string s 'Every bit FUNCTION southward=GetFile "t.txt" 'AS PROCEDURE Getfile "t.txt",s
Oz [edit]
The interface for file operations is object-oriented.
declare
FileHandle = {New Open up.file init(name:"examination.txt" ) }
FileContents = {FileHandle read(size:all listing:$) }
in
{FileHandle close}
{Organization.printInfo FileContents}
FileContents is a listing of bytes. The operation does non presume whatever particular encoding.
Panda [edit]
It returns a unicode string of type 'text'.
file:readme.txt .text
PARI/GP [edit]
The GP interpreter'due south ability to read files is extremely express; reading an entire file is nearly all that it tin can do. The C lawmaking PARI library is not similarly limited.
readstr() returns a vector of strings which are the file lines, without newlines. They tin be concatenated to brand a single string.
str = concat ( use (s-> concat (s, "\n" ) , readstr( "file.txt" ) ) )
Since readstr() returns strings without newlines at that place's no manner to tell whether the terminal line had a newline or not. This is fine for its intended utilize on text files, but non good for reading binary files.
Pascal [edit]
Run into TStrignList case of Delphi
Perl [edit]
The modern recommended way, is using one of these CPAN modules:
-
use File:: Slurper 'read_text' ;
my $text = read_text( $filename , $data ) ; -
utilize Path:: Tiny ;
my $text = path( $filename ) -> slurp_utf8 ; -
use IO:: All ;
$text = io( $filename ) -> utf8 -> all ;
Traditional ways, without CPAN modules:
-
open up my $fh , '<:encoding(UTF-eight)' , $filename or dice "Could non open up '$filename': $!" ;
my $text ;
read $fh , $text , - s $filename ;
close $fh ; -
my $text ;
{
local $/ = undef ;
open my $fh , '<:encoding(UTF-8)' , $filename or die "Could not open up '$filename': $!" ;
$text = < $fh >;
shut $fh ;
} -
my $text = practice { local ( @ ARGV , $/ ) = ( $filename ) ; <> } ;
For a one-liner from beat, employ -0[code]. It normally specifies the oct char lawmaking of tape separator ($/), so for example perl -n -040 would read chunks of text ending at each space ($/ = ' '). However, -0777 has special meaning: $/ = undef, and so the whole file is read in at once (chr 0777 happens to be "Ç¿", merely Larry doesn't recollect 1 should apply that every bit tape separator).
perl -n -0777 -eastward 'print "file len: ".length' stuff.txt
Memory-mapping [edit]
utilize File:: Map 'map_file' ;
map_file( my $str , "foo.txt" ) ;
print $str ;
use Sys:: Mmap ;
Sys:: Mmap -> new ( my $str , 0 , 'foo.txt' )
or die "Cannot Sys::Mmap->new: $!" ;
print $str ;
File::Map has the advantage of non requiring an explicit munmap(). Its necktie is faster than the tie form of Sys::Mmap too.
Phix [edit]
? get_text ( command_line ()[ ii ])
"?get_text(command_line()[ii])\r\northward"
The value returned past get_text is actually a cord containing raw binary data (no \r\due north -> \northward substitution, even when the file is opened in text mode) and is not limited to text files.
In that location is no builtin method for handling dissimilar encodings, but demo\edita handles all such files with ease, including the nifty footling encoding drop-down on the open up/shut dialog.
PHP [edit]
Read as string
file_get_contents ( $filename )
Read as array, i element per line
file ( $filename )
PicoLisp [edit]
Using 'till' is the shortest style:
(in "file" (till NIL T))
To read the file into a list of characters:
(in "file" (till NIL))
or, more than explicit:
(in "file" (make (while (char) (link @))))
Encoding is ever assumed to be UTF-8.
Freeway [edit]
string content=Stdio.File ( "foo.txt" ) ->read( ) ;
would be the generic fashion of reading an entire file, but at that place is besides a special role for information technology:
string content=Stdio.read_file ( "foo.txt" ) ;
PL/I [edit]
get file (in) edit ((substr(s, i, 1) do i = i to 32767)) (a);
PowerShell [edit]
Get-Content foo.txt This will but detect Unicode correctly with a BOM in place (even for UTF-viii). With explicit selection of encoding:
Become-Content foo.txt -Encoding UTF8
However, both return an array of strings which is fine for pipeline use but if a single string is desired the array needs to be joined:
( Become-Content foo.txt) -join "`n"
PureBasic [edit]
A file tin can be read with any of the congenital in commands
Number.b = ReadByte (#File)
Length.i = ReadData (#File, *MemoryBuffer, LengthToRead)
Number.c = ReadCharacter (#File)
Number.d = ReadDouble (#File)
Number.f = ReadFloat (#File)
Number.i = ReadInteger(#File)
Number.l = ReadLong (#File)
Number.q = ReadQuad (#File)
Text$ = ReadString (#File [, Flags] )
Number.w = ReadWord (#File)
If the file is due south pure text file (no CR/LF etc.), this volition work and will read each line untill EOL is found.
If ReadFile ( 0, "RC.txt" )
Variable$= ReadString ( 0 )
CloseFile ( 0 )
EndIf
Since PureBasic terminates strings with a #NULL and also split the ReadString() is encountering new line chars, whatsoever file containing these must be treated as a data stream.
Title$= "Select a file"
Pattern$= "Text (.txt)|*.txt|All files (*.*)|*.*"
fileName$ = OpenFileRequester (Title$,"",Design$,0 )
If fileName$
If ReadFile ( 0, fileName$)
length = Lof ( 0 )
*MemoryID = AllocateMemory (length)
If *MemoryID
bytes = ReadData ( 0, *MemoryID, length)
MessageRequester ( "Info",Str (bytes) + " was read" )
EndIf
CloseFile ( 0 )
EndIf
EndIf
Python [edit]
open up (filename).read ( )
This returns a byte string and does not assume any item encoding.
In Python 3 strings are in unicode, yous can specify encoding when reading:
open (filename, encoding= 'utf-viii' ).read ( )
Python docs recommend dealing with files using the with statement:
with open up (filename) as f:
data = f.read ( )
Starting in Python iii.4, nosotros can use pathlib to reduce boilerplate:
from pathlib import Pathany_string = Path(filename).read_text (encoding= 'utf-8' )
any_binary_data = Path(filename).read_bytes ( )
Quackery [edit]
sharefile takes a file proper name in a cord as an argument, appends a file path if there is one on the ancillary stack filepath, and returns the contents of the file as a cord, and 1 (i.e. true) if the file exists. If the file does non exist it returns the proper noun of the file and 0 (i.e. simulated).
$ "myfile.txt" sharefile
Q [edit]
q)file:read0 `:file.txt
"First line of file"
"Second line of file"
""
R [edit]
fname <- "notes.txt"
contents <- readChar(fname, file.info(fname)$size)
Dissonance [edit]
(file->string "foo.txt")
Raku [edit]
(formerly Perl vi)
my $cord = slurp 'sample.txt' ;
The default encoding is UTF-8. The :enc adverb tin be used to specify a unlike one:
my $cord = slurp 'sample.txt' , :enc<UTF- 16 >;
IO::Path objects also provide slurp as a method:
my $cord = 'sample.txt' . IO . slurp ;
Raven [edit]
'myfile.txt' read every bit $content_as_string
or
'file://r:/home/me/myfile.txt' open up every bit $handle
$handle read as $content_as_string
$handle close
REALbasic [edit]
This office accepts a file (FolderItem object) and an optional TextEncoding class. If the TextEncoding is not divers, then REALbasic defaults to UTF-eight. Since information technology is intended for cross-platform evolution, REALbasic has a number of built-in tools for working with different text encodings, line terminators, etc. [one]
Office readFile(theFile As FolderItem, txtEncode As TextEncoding = Zippo) As Cord
Dim fileContents As String
Dim tis As TextInputStream
tis = tis.Open(theFile)
fileContents = tis.ReadAll(txtEncode)
tis.Close
Return fileContentsException err As NilObjectException
MsgBox("File Not Found.")
Cease Function
REBOL [edit]
read %my-file ; read equally text
read /binary %my-file ; preserve contents exactly
Retro [edit]
here 'input.txt file:slurp
REXX [edit]
using LINEIN [edit]
/*REXX programme reads an entire file line-past-line and stores it as a continuous string.*/
parse arg iFID . /*obtain optional statement from the CL.*/
if iFID=='' then iFID= 'a_file' /*Not specified? And so utilize the default.*/
$= /*a string of file's contents (and so far).*/
exercise while lines (iFID) \==0 /*read the file'due south lines until finished.*/
$=$ || linein (iFID) /*append a (file's) line to the string,*/
end /*while*/ /*stick a fork in it, nosotros're all done. */
using CHARIN [edit]
Note that CRLF are in the resulting string.
/*REXX program reads a file and stores information technology every bit a continuous character str.*/
Parse Version v
iFID = 'st.in' /*name of the input file. */
If left(v,eleven)='REXX-Regina' |,
left(five,11)='REXX-ooRexx' Then Practise
len=chars(iFid) /*size of the file */
five = charin(iFid,,len) /*read entire file */
End
Else Do /* for other Rexx Interpreters */
v=''
Do while chars(iFid)>0 /* read the file chunk by chunk */
five=v||charin(iFid,,500)
End
End
say 'v='v
say 'length(5)='length(v)
E:\>rexx refc v=line 1 of three line 2 of 3 line 3 of three length(v)=39
Ring [edit]
# Read the file
cStr = read("myfile.txt")
# print the file content
Encounter cStr
Besides in one line nosotros can read and print the file content.
cStr = read("myfile.txt") See cStr
Nosotros can avoid the string, merely it's required in the job.
See read("myfile.txt")
Ruby [edit]
IO.read is for text files. It uses the default text encodings, and on Microsoft Windows, information technology likewise converts "\r\n" to "\n".
# Read entire text file.
str = IO.read "foobar.txt"# It tin can also read a subprocess.
str = IO.read "| grep ftp /etc/services"
Caution! IO.read and File.read take a portname. To open an arbitrary path (which might kickoff with "|"), you must use File.open, then IO#read.
path = "|strange-name.txt"
str = File.open (path) { |f| f.read }
To read a binary file, open it in binary fashion.
# Read entire binary file.
str = File.open (path, "rb" ) { |f| f.read }
Scarlet ane.nine can read text files in different encodings.
# Read EUC-JP text from file.
str = File.open (path, "r:euc-jp" ) { |f| f.read }# Read EUC-JP text from file; transcode text from EUC-JP to UTF-8.
str = File.open (path, "r:euc-jp:utf-8" ) { |f| f.read }
Run Basic [edit]
open DefaultDir$ + "/public/test.txt" for binary as #f
fileLen = LOF(#f)
a$ = input$(#f, fileLen)
print a$
close #f
Rust [edit]
use std::fs::File;
use std::io::Read;fn main() {
let mut file = File::open("somefile.txt").unwrap();let mut contents: Vec<u8> = Vec::new();
// Returns amount of bytes read and append the result to the buffer
let result = file.read_to_end(&mut contents).unwrap();
println!("Read {} bytes", issue);// To print the contents of the file
let filestr = String::from_utf8(contents).unwrap();
println!("{}", filestr);
}
Scala [edit]
object TextFileSlurper extends App {
val fileLines =
try scala.io.Source.fromFile ( "my_file.txt", "UTF-8" ).mkString catch {
case east: java.io.FileNotFoundException => e.getLocalizedMessage ( )
}
}
Scheme [edit]
Uses SRFI-13:
( with-input-from-file "foo.txt"
( lambda ( )
(opposite-list-> string
( let loop ( (char ( read-char ) )
(result '( ) ) )
( if ( eof-object? char)
result
(loop ( read-char ) ( cons char result) ) ) ) ) ) )
Works with Craven Scheme:
( with-input-from-file "foo.txt" read- string )
In GNU Guile, with decoding into Unicode code points:
(employ-modules (ice- nine textual-ports) )
( call-with-input-file "foo.txt" get-string-all)
Seed7 [edit]
The library getf.s7i defines the function getf, which reads a whole file into a cord:
$ include "seed7_05.s7i";
include "getf.s7i";const proc: main is func
local
var string: fileContent is "";
begin
fileContent := getf("text.txt");
finish func;
SenseTalk [edit]
Put file "~/Documents/myFile.txt" into TestFile
put testFile
Sidef [edit]
Reading an entire file equally a cord, tin can be achieved with the FileHandle.slurp() method, as illustrated blare:
var file = File.new ( __FILE__ );
var content = file.open_r.slurp;
impress content;
Starting with version 2.30, File.read() can do the same:
var file = File ( __FILE__ )
var content = file.read ( :utf8 )
print content
Smalltalk [edit]
( StandardFileStream oldFileNamed: 'foo.txt' ) contents
'foo.txt' asFilename contentsAsString SNOBOL4 [edit]
In SNOBOL4, file I/O is done by associating a variable with the desired file, via the input() built-in function. After the association, each reference to the named variable provides as the variable's value the side by side cake or line of data from the corresponding file. The exact format of the input() function parameters tends to vary based on the implementation in employ. In this example, the code reads the file in blocks of 512k bytes (or less) until the entire file has been read into one long string in memory.
input(.inbin,21,"filename.txt [-r524288]") :f(finish)
rdlp buf = inbin :south(rdlp)
*
* at present procedure the 'buf' containing the file
*
end
Sparkling [edit]
let contents = readfile("foo.txt"); SPL [edit]
text = #.readtext("filename.txt") Standard ML [edit]
fun readFile path =
(fn strm =>
TextIO.inputAll strm earlier TextIO.closeIn strm) (TextIO.openIn path)
Stata [edit]
Information technology'due south possible to get the entire content as an array of lines with cat. However, here we want a unmarried cord. See fopen and related functions.
mata
f = fopen("somedata.txt", "r")
fseek(f, 0, 1)
n = ftell(f)
fseek(f, 0, -i)
s = fread(f, north)
fclose(f)
terminate
Swift [edit]
import Foundationlet path = "~/input.txt".stringByExpandingTildeInPath
if permit cord = String(contentsOfFile: path, encoding: NSUTF8StringEncoding) {
println(string) // print contents of file
}
Tcl [edit]
This reads the information in as text, applying the default encoding translations.
set f [ open $filename ]
set data [ read $f ]
close $f
To read the information in as uninterpreted bytes, either use fconfigure to put the handle into binary way before reading, or (from Tcl viii.5 onwards) do this:
set f [ open $filename "rb" ]
set data [ read $f ]
close $f
TUSCRIPT [edit]
$$ MODE TUSCRIPT
ERROR/Finish Open ("rosetta.txt",READ,-std-)
var=FILE ("rosetta.txt")
TXR [edit]
@(next "foo.txt")
@(freeform)
@LINE
The freeform directive in TXR causes the remaining lines of the text stream to be treated as 1 big line, catenated together. The default line terminator is the newline "\n". This lets the entire input be captured into a single variable as a whole-line match.
UNIX Shell [edit]
We commencement a 'true cat' procedure to read the entire file, and use '$(...)' to grab the output of 'cat'. We utilize 'printf' which might be more portable than 'echo'. Because '$(...)' can chop off a newline at the end of the file, we tell 'printf' to add an extra newline.
f=`cat foo.txt` # f volition contain the entire contents of the file
printf '%southward\n' "$f"
f=$( true cat foo.txt)
printf '%due south\n' "$f"
Some shells provide a shortcut to read a file without starting a 'cat' process.
f=$( <foo.txt)
echo -E "$f"
file=$( <foo.txt)
print $file
alternatively
zmodload zsh/mapfile
impress $mapfile [foo.txt]
Ursa [edit]
decl string contents
decl file f
f.open "filename.txt"
set contents (f.readall)
Vala [edit]
string file_contents;
FileUtils.get_contents ( "foo.txt", out file_contents) ;
VBScript [edit]
Read text file with default encoding into variable and display
dim southward
southward = createobject("scripting.filesystemobject").opentextfile("slurp.vbs",1).readall
wscript.echo s
Read text file with UTF-16 encoding into retentiveness and display
wscript.repeat createobject("scripting.filesystemobject").opentextfile("utf16encoded.txt",one,-1).readall
Vedit macro linguistic communication [edit]
In Vedit Macro Language, a "cord variable" can exist either an edit buffer or a text register.
Text registers can hold simply a express amount of data (about 120 KB each in current version).
Edit buffers tin handle files of unlimited size (even larger than the size of virtual memory). For large files, just a part of the file is kept in retentivity, but from users point of view there is no practical divergence to having the whole file in memory.
Read file into edit buffer. The buffer is allocated automatically:
File_Open( "example.txt" )
Read file into text annals ten:
Reg_Load( x , "instance.txt" )
Visual Basic [edit]
Declare Part MultiByteToWideChar Lib "kernel32.dll" ( _
ByVal CodePage Equally Long, _
ByVal dwFlags As Long, _
ByVal lpMultiByteStr As Long, _
ByVal cchMultiByte Equally Long, _
ByVal lpWideCharStr As Long, _
ByVal cchWideChar Equally Long) As Long
Const CP_UTF8 As Long = 65001Sub Main()
Dim fn Equally Integer
Dim i As Long
Dim b() As Byte
Dim southward As Stringfn = FreeFile()
Open "c:\exam.txt" For Binary Access Read Equally #fn
ReDim b(0 To (LOF(fn) - 1))
Get #fn, one, b()If b(0) = &HFF And b(1) = &HFE Then
'UTF-16, little-endian
ReDim b(0 To (LOF(fn) - three))
Get #fn, iii, b()
s = b()
ElseIf b(0) = &HEF And b(1) = &HBB And b(ii) = &HBF Then
'UTF-8
i = MultiByteToWideChar(CP_UTF8, 0&, VarPtr(b(3)), LOF(fn) - three, StrPtr(southward), 0)
s = Infinite$(i)
i = MultiByteToWideChar(CP_UTF8, 0&, VarPtr(b(3)), LOF(fn) - 3, StrPtr(due south), Len(s))
Else
'assume ANSI
due south = StrConv(b(), vbUnicode)
Cease If
Close #fn
Debug.Print s
End Sub
Visual Basic .NET [edit]
Imports System. IOPublic Grade Form1
' Read all of the lines of a file.
' Part assumes that the file exists.
Individual Sub ReadLines( ByVal FileName As String )Dim oReader Every bit New StreamReader(FileName)
Dim sLine Equally String = oReader. ReadToEnd ( )oReader. Close ( )
Finish Sub
Stop Grade
Wart [edit]
with infile "x"
with outstring
whilet line (read_line)
prn line
Wren [edit]
Wren'due south File.Read(path) static method reads the entire contents of the file at path and returns information technology every bit a string.
Every bit per the documentation: "No encoding or decoding is washed. If the file is UTF-8, so the resulting string will be a UTF-8 string. Otherwise, it will exist a string of bytes in whatsoever encoding the file uses."
For the following script, a file called "input.txt" has been created which contains the cord "abcdefghijklmnopqrstuvwxyz".
import "io" for FileOrganisation. impress (File. read ( "input.txt" ) )
abcdefghijklmnopqrstuvwxyz
XPL0 [edit]
This example reads its own source code file and displays it equally a string. The command line is: readfile <readfile.xpl
include c:\cxpl\codes; \intrinsic 'code' declarations
string 0; \use zero-terminated cord convention
int I;
char Str;
[Str:= GetHp; \starting address of cake of local "heap" memory
I:= 0; \ [does the exact aforementioned matter as Reserve(0)]
loop [Str(I):= ChIn(1);
if Str(I) = $1A\EOF\ and then [Str(I):= 0; quit];
I:= I+1;
];
SetHp(Str+I+1); \set heap arrow beyond Str (not really needed here)
Text(0, Str); \show file as a string
]
include c:\cxpl\codes; \intrinsic 'lawmaking' declarations string 0; \utilise nada-terminated string convention int I; char Str; [Str:= GetHp; \starting address of cake of local "heap" retentivity I:= 0; \ [does the exact aforementioned affair as Reserve(0)] loop [Str(I):= Chin(1); if Str(I) = $1A\EOF\ then [Str(I):= 0; quit]; I:= I+1; ]; SetHp(Str+I+1); \ready heap pointer beyond Str (not really needed here) Text(0, Str); \show file as a string ]
Xtend [edit]
package com.rosetta.exampleimport coffee.io.File
import coffee.io.PrintStreamclass ReadFile {
def static main( Cord ... args ) {
val content = new String (Files.readAllBytes (Paths.get ( "file.txt" ) ) )
}
}
Yorick [edit]
This loads foo.txt into lines as an array of strings. Each array element is one line. Each line'southward trailing newline is removed.
lines = rdfile("foo.txt"); This loads foo.txt into content every bit a single scalar string, without losing newlines.
f = open up("foo.txt", "rb");
raw = array(char, sizeof(f));
_read, f, 0, raw;
close, f;
content = strchar(raw); zkl [edit]
data := File("foo.txt","r").read() The file parameters are the same as C's
Source: http://www.rosettacode.org/wiki/Read_entire_file
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