fastest way to copy binary files...

[Unregistered]

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

[ygfperson]

i think so. if speed is really an issue, you could use a FILE* pointer from C.

[Unregistered]

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?

[Unregistered]

#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?

[Prelude]

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

[Salem]

> 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.

#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;
}

[Unregistered]

thank you salem and prelude your great!