想实现dos下文件复制。为什么复制文档正确，像图片之类的东西复制后的就无法打开啊？想复制任何文件应该怎么写啊？（不用FileCopy()函数...）
#include"stdio.h"
main(int argc,char *argv[])
{
    FILE *in,*out;
    char ch;
    if(argc!=3)
    {
        printf("error!\n");
        exit(1);
    }
    if((in=fopen(argv[1],"r"))==NULL)
    {
        printf("can't open %s.\n",argv[1]);
        exit(1);
    }
    if((out=fopen(argv[2],"w"))==NULL)
    {
        printf("can't open %s.\n",argv[2]);
        exit(1);
    }
    ch=fgetc(in);
    while(!feof(in))
    {
        fputc(ch,out);
        ch=fgetc(in);
    }
    fclose(in);
    fclose(out);
}

哦,好使了~多谢