libcurl之curl_easy_getinfo的使用教程

http://blog.csdn.net/php_fly/article/details/17171985

执行结果

代码

[cpp]view plain copy

// getinfo.cpp : 定义控制台应用程序的入口点。
//
#include "stdafx.h"
#include <iostream>
using namespace std;
#include "curl/curl.h"
#pragma comment(lib, "curllib.lib")
//回调函数
size_t process_data(void *buffer, size_t size, size_t nmemb, void *user_p)
{
FILE *fp = (FILE *)user_p;
size_t return_size = fwrite(buffer, size, nmemb, fp);
//cout << (char *)buffer << endl;
return return_size;
}
void print_cookies(CURL *curl)
{
CURLcode res;
struct curl_slist *cookies;
struct curl_slist *nc;
int i;
printf("Cookies, curl knows:\n");
res = curl_easy_getinfo(curl, CURLINFO_COOKIELIST, &cookies);
if (res != CURLE_OK) {
fprintf(stderr, "Curl curl_easy_getinfo failed: %s\n", curl_easy_strerror(res));
exit(1);
}
nc = cookies, i = 1;
while (nc) {
printf("[%d]: %s\n", i, nc->data);
nc = nc->next;
i++;
}
if (i == 1) {
printf("(none)\n");
}
curl_slist_free_all(cookies);
}
int _tmain(int argc, _TCHAR* argv[])
{
// 初始化libcurl
CURLcode return_code;
return_code = curl_global_init(CURL_GLOBAL_WIN32);
if (CURLE_OK != return_code)
{
cerr << "init libcurl failed." << endl;
return -1;
}
// 获取easy handle
CURL *easy_handle = curl_easy_init();
if (NULL == easy_handle)
{
cerr << "get a easy handle failed." << endl;
curl_global_cleanup();
return -1;
}
FILE *fp = fopen("data.html", "ab+");
char *url = "http://blog.csdn.com/php_fly";
//char *url = "http://www.csdn.com";
// 设置easy handle属性
curl_easy_setopt(easy_handle, CURLOPT_URL, url);
curl_easy_setopt(easy_handle, CURLOPT_WRITEFUNCTION, &process_data);
// curl_easy_setopt(easy_handle, CURLOPT_VERBOSE, 1L);
//curl_easy_setopt(easy_handle, CURLOPT_COOKIEFILE, ""); /* just to start the cookie engine */
//fp：回调函数的参数
curl_easy_setopt(easy_handle, CURLOPT_WRITEDATA, fp);
// 执行数据请求
return_code = curl_easy_perform(easy_handle);
if (return_code != CURLE_OK)
{
printf( "Failed to get '%s' [%s]\n",url, return_code);
return 0;
}
//
int totalTime = 0;
return_code = curl_easy_getinfo(easy_handle,CURLINFO_TOTAL_TIME,&totalTime);
if((CURLE_OK==return_code) && totalTime)
cout<<"耗时:"<<totalTime<<endl;
long downLength = 0;
return_code = curl_easy_getinfo(easy_handle,CURLINFO_CONTENT_LENGTH_DOWNLOAD,&downLength);
if((CURLE_OK==return_code) && downLength)
cout<<"下载的文件大小:"<<downLength<<endl;
long retcode = 0;
return_code = curl_easy_getinfo(easy_handle, CURLINFO_RESPONSE_CODE , &retcode);
if((CURLE_OK==return_code) && retcode)
cout<<"状态码:"<<retcode<<endl;
char *contentType={0};
return_code = curl_easy_getinfo(easy_handle, CURLINFO_CONTENT_TYPE , &contentType);
if((CURLE_OK==return_code) && contentType)
cout<<"请求的文件类型:"<<contentType<<endl;
//输出cookie信息
print_cookies(easy_handle);
long filetime = 0;
return_code = curl_easy_getinfo(easy_handle, CURLINFO_FILETIME , &filetime);
if((CURLE_OK==return_code) && filetime)
cout<<"远程获取文档的时间:"<<filetime<<endl;
long namelookuptime = 0;
return_code = curl_easy_getinfo(easy_handle, CURLINFO_NAMELOOKUP_TIME , &namelookuptime);
if((CURLE_OK==return_code) && namelookuptime)
cout<<"名称解析所消耗的时间:"<<namelookuptime<<""<<endl;
long requestSize = 0;
return_code = curl_easy_getinfo(easy_handle, CURLINFO_REQUEST_SIZE , &requestSize);
if((CURLE_OK==return_code) && requestSize)
cout<<"请求头大小:"<<requestSize<<"字节"<<endl;
long headerSize = 0;
return_code = curl_easy_getinfo(easy_handle, CURLINFO_HEADER_SIZE , &headerSize);
if((CURLE_OK==return_code) && headerSize)
cout<<"响应头大小:"<<headerSize<<"字节"<<endl;
//获取URL重定向地址
curl_easy_setopt(easy_handle, CURLOPT_FOLLOWLOCATION, true);
char* redirectUrl = {0};
return_code = curl_easy_getinfo(easy_handle, CURLINFO_REDIRECT_URL , &redirectUrl);
if((CURLE_OK==return_code) && redirectUrl)
cout<<"URL重定向地址:"<<redirectUrl<<endl;
else
cout<<"URL重定向地址:"<<NULL<<endl;
char *ipAddress={0};
return_code = curl_easy_getinfo(easy_handle, CURLINFO_PRIMARY_IP,&ipAddress);
if((CURLE_OK==return_code) && ipAddress)
cout<<"请求的服务器IP:"<<ipAddress<<endl;
long downloadSpeed = 0;
return_code = curl_easy_getinfo(easy_handle, CURLINFO_SPEED_DOWNLOAD , &downloadSpeed);
if((CURLE_OK==return_code) && downloadSpeed)
printf("平均下载速度: %0.3f kb/s.\n", downloadSpeed/ 1024);
//
// 释放资源
fclose(fp);
curl_easy_cleanup(easy_handle);
curl_global_cleanup();
getchar();
return 0;
}

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libcurl之curl_easy_getinfo的使用教程

执行结果

代码

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