如何将两个大文件合并？

[kevin6]

我指的是不生成新的文件，而直接让它们合并。当然字节数是簇大小的倍数，能做到吗？

[phiger]

CreateFileMapping and MapViewOfFile, write filemapping directly!!

[qing_li73]

Just use a buffer, transfer the data between the two files

The follow sample showes u copy data from a buffer, u can adjust it for ur requirement

Example

/* WRITE.C: This program opens a file for output
* and uses _write to write some bytes to the file.
*/

#include <io.h>
#include <stdio.h>
#include <stdlib.h>
#include <fcntl.h>
#include <sys/types.h>
#include <sys/stat.h>

char buffer[] = "This is a test of '_write' function";

void main( void )
{
int fh;
unsigned byteswritten;

if( (fh = _open( "write.o", _O_RDWR | _O_CREAT,
_S_IREAD | _S_IWRITE )) != -1 )
{
if(( byteswritten = _write( fh, buffer, sizeof( buffer ))) == -1 )
perror( "Write failed" );
else
printf( "Wrote %u bytes to file\n", byteswritten );

_close( fh );
}
}


Output

Wrote 36 bytes to file