程序代码：

void fileOperate_rw(){


    char path_1[100] = "D:\\desktop\\第1讲 6.2-6.2.5不局限内存-文件.mp4";
    char path_2[100] = "D:\\desktop\\2.mp4";

    FILE* pfa = fopen(path_1,"rb");
    FILE* pfb = fopen(path_2,"wb");

    if(pfa == NULL && pfb == NULL){
        printf("error,file not found");
    }else{
        //fseek(pf1,0,SEEK_END);
        //int count_file_b = ftell(pf1);
        char buff[1024] = {0};
        int result;
        while((result = fread(buff,sizeof(buff),1,pfa))!=0){
            //printf("%d\n",result);
            fwrite(buff,sizeof(buff),result,pfb);

            /*fgets(buff,sizeof(buff),pfa);
            fputs(buff,pfb);*/
        }
    }

    fclose(pfa);
    fclose(pfb);

 }