C文件拷贝实例

C文件拷贝实例

使用的C语言的文件API。以参数传递要拷贝的文件以及目标文件。

#include <iostream>
#include <cstdio>
#include <ctime>
#include <cstdint>
using namespace std;
void printerror(const char *p){
    if(!p)
        return;
    cout<<"================================!========================="<<endl;
    cout<<"can't open "<<p<<endl;
    cout<<"================================!========================="<<endl;
}
int file_copy(const char *arg1,const char *arg2){
    int n=0;
    char *buf=new char[1024];
    FILE *fp1=fopen(arg1,"rb");
    if(NULL==fp1){
        printerror(arg1);
        return -1;
    }
    FILE *fp2=fopen(arg2,"wb");
    if(NULL==fp2){
        printerror(arg2);
        return -1;
    }
    cout<<"Start copy file "<<arg1<<endl;
    time_t time_use=time(NULL);
    while((n=fread(buf,sizeof(char),1024,fp1))){
        fwrite(buf,sizeof(char),1024,fp2);
    }
    fclose(fp1);
    fclose(fp2);
    cout<<"time use:"<<(time(NULL)-time_use)<<"s"<<endl;
    cout<<"file copy done"<<endl;
    delete buf;
    return 0;
}
int main(int argc ,char **argv)
{
    if(argc<3){
        cout<<"Usage:"<<argv[0]<<" "<<"argv[1] argv[2]"<<endl;
        return -1;
    }
    return file_copy(argv[1],argv[2]);
}