c程序将媒体文件从一个位置复制到另一个位置

Question

#include<stdio.h>
#include<stat.h>
#include<fcntl.h>
main()
{
int inhandle,outhandle,bytes;
char source[128],target[128],buffer[512];
printf("enter source file name\n");
scanf("%s",source);

inhandle=open(source,O_RDONLY|O_BINARY);
if(inhandle==-1)
{
    printf("cannot open source file\n");
    exit(0);
}
printf("enter target file name\n");
scanf("%s",target);
outhandle=open(target,O_CREAT|O_BINARY,O_WRONLY,S_IWRITE);
if(outhandle==-1)
{

    printf("cannot open target file\n");
    close(outhandle);
    exit(0);
}
while(1)
{
    bytes=read(inhandle,buffer,512);
    if(bytes>0)
    {
        write(outhandle,buffer,bytes);
    }
    else
    break;
}
close(inhandle);
close(outhandle);
}

program compiles with 0 errors and when i pass the arguments in scanf there even no errors related to opening the file is thrown.i cannot seem to copy any media file like .avi format with this program,the file does gets created in its target location but with 0 bytes.

Answer 1

The problem is in your second open(2) call:

outhandle=open(target,O_CREAT|O_BINARY,O_WRONLY,S_IWRITE);
                                      ^        ^

Instead of the second comma, you probably meant a | . Because of that comma O_WRONLY will be the third argument, the mode and the file won't have the correct permissions.