curl 以http方式读取文件并保存

以下为主函数代码：

void main(){

    //initialization
    CURL *curl;
    CURLcode res;
    curl = curl_easy_init();
    
    if(curl){

        //define file for store downloaded file
        FILE* fp;
        fp = fopen( "c:/test.rar", "wb");
        string fileurl = "http://localhost/files/test.rar";
        curl_easy_setopt(curl, CURLOPT_URL, fileurl.c_str() );
        
        /* Define our callback to get called when there's data to be written */ 
        curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, curlCallBackFileWrite);
        /* Set a pointer to our struct to pass to the callback */ 
        curl_easy_setopt(curl, CURLOPT_WRITEDATA, fp);

        res = curl_easy_perform(curl);
        
        //always close file
        fclose(fp);
        }
    }
    
    //always cleanup
    curl_easy_cleanup(curl);
}

以下为 curlCallBackFileWrite 回调处理：

static size_t curlCallBackFileWrite(void *buffer, size_t size, size_t nmemb, void *stream)
{
    int written = fwrite(buffer, size, nmemb , (FILE *)stream); 
    return written; 
}

完。
这当然也可以存储页面文件。
curl 的功能还有很多，比如FTP,SSL等，可以参考官方示例
链接：http://curl.haxx.se/libcurl/c/example.html