fastest way to copy binary files...

This is a discussion on fastest way to copy binary files... within the C++ Programming forums, part of the General Programming Boards category; would this be using ios::binary? since i will be copying *.exe so im wondering how it should be done... i ...

  1. #1
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    fastest way to copy binary files...

    would this be using ios::binary? since i will be copying *.exe so im wondering how it should be done... i dont want to use system since speed is an issue

  2. #2
    Just because ygfperson's Avatar
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    i think so. if speed is really an issue, you could use a FILE* pointer from C.

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    Code:
    FILE *OriginalFile = fopen(Progname, "rb");
    FILE *CopiedFile = fopen(RndWords, "wb");
    int gk;
    while ((gk = fgetc(OriginalFile)) != EOF); 
    fputc(gk, CopiedFile);
    does this look right? and can anyone explain to what this does line for line?

  4. #4
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    Code:
    #include <iostream.h>
    #include <stdio.h>
    #include <stdlib.h>
    
    int main()
    {
    	FILE *OriginalFile = fopen("C:\\Microsoft Visual Studio\\compile files\\Debug\\filecopy.exe", "rb");
    	FILE *CopiedFile = fopen("C:\\Microsoft Visual Studio\\compile files\\copyfile.exe", "wb");
    	int gk;
    	while ((gk = fgetc(OriginalFile)) != EOF); 
    	fputc(gk, CopiedFile);
    	return (0);
    }
    ok it copies the file but one file is 165kb big the orignal and the other is 1b big? what am i doing wrong?

  5. #5
    Code Goddess Prelude's Avatar
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    A search of the boards would give you a very informative thread with quite a few different methods. Here, I'll give you a little boost:
    http://www.cprogramming.com/cboard/s...threadid=16157

    It's in C, but all of the methods can be converted to C++ fairly easily.

    -Prelude
    My best code is written with the delete key.

  6. #6
    and the hat of wrongness Salem's Avatar
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    > while ((gk = fgetc(OriginalFile)) != EOF);
    Remove the ;

    It means you do nothing until you reach the end of file, then you write a single char

    For speed, you need to copy a block at a time, not a char
    Eg.
    Code:
    #include <stdio.h>
    
    int main ( ) {
        char    buff[BUFSIZ];
        FILE    *in, *out;
        size_t  n;
    
        in = fopen( "a.exe", "rb" );
        out= fopen( "test.bin", "wb" );
        while ( (n=fread(buff,1,BUFSIZ,in)) != 0 ) {
            fwrite( buff, 1, n, out );
        }
        return 0;
    }

  7. #7
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    thank you salem and prelude your great!

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