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ComputingIoBinary

file Length Cpp

viewed 4257 times and licensed 62 times
Calculate the length of C++ - style files
Controller: CodeCogs

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Interface

C++

FileLengthCpp

 
intfileLengthCppstd::fstream*file )
The C++ - version of Will Bateman's binary/file_length

Returns the length of a file in bytes. Useful when you need to dynamically allocate memory to hold the contents of a file you intend to read. This function was designed to replicated the similarly named filelength function that comes with some distributions of C/C++, particularly on DOS platforms. There doesn't appear to be an equivalent in Unix.

Example 1

#include <stdio.h>
#include <codecogs/computing/io/binary/file_length.h>
 
using namespace Computing::IO::Binary;
 
int main ()
{
  FILE* stream = fopen("/codecogs/io/binary/file_length.h","rb");
  printf("\n File length=%d", fileLength(stream));
  fclose(stream);
 
  return 0;
}

Parameters

streamA pointer to the file stream

Returns

The length of the file in bytes. Return -1 if an error is encountered.

Authors

Will Bateman (March 2005)

References:

fileLength

Example 2

#include <iostream>
#include <fstream>
#include <codecogs/computing/io/binary/file_length_cpp.h>
 
using namespace std;
 
int main(int argc, char** argv)
{
        if(argc < 2) return (-1);

fstream a(argv[1]); cout <<"The file "<<argv[1] <<" is "<<fileLengthCpp(&a) <<"bytes long."<<endl; return (0); }

Parameters

fileis a pointer referring to a C++ fstream object.

Returns

fileLengthCpp returns the length of the input file in bytes. On failure it returns -1.

Authors

Robert Schwede
Source Code

Source code is available when you agree to a GP Licence.

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