#include <curl/curl.h>
#include <iostream>
#include <string>
using namespace std;
//处理接收到的下载数据的回调函数
size_t _process_data ( char* buffer, size_t size, size_t nmemb, string* user_p )
{
size_t totle = size * nmemb;
if ( user_p == NULL ) return totle;
user_p->append ( buffer, totle );
return totle;
}
int main()
{
//curl_global_init用来初始化libcurl要用到的一系列的全局常量
CURLcode code = curl_global_init ( CURL_GLOBAL_ALL );
if ( code != CURLE_OK )
{
cout << "test *** curl_global_init 调用失败 [" << code << "]\n";
return -1;
}
//curl_easy_init用来返回CRUL easy句柄;后续其他函数调用都要用到这个句柄
CURL* curl = curl_easy_init();
if ( NULL == curl )
{
cout << "test *** curl_easy_init 失败\n";
return -1;
}
//curl_easy_setopt用来设置参数或选项
//CURLOPT_HEADER设置是否将头包含在输出中
curl_easy_setopt ( curl, CURLOPT_HEADER, true );
//CURLOPT_TIMEOUT设置函数执行的最长时间,时间单位为s
curl_easy_setopt ( curl, CURLOPT_TIMEOUT, 300 );
curl_easy_setopt ( curl, CURLOPT_WRITEFUNCTION, &_process_data );
string buff;
//CURLOPT_WRITEDATA设置存储数据的变量
curl_easy_setopt ( curl, CURLOPT_WRITEDATA, &buff );
string url = "http://www.baidu.com";
//CURLOPT_URL设置要处理的URL地址
curl_easy_setopt ( curl, CURLOPT_URL, url.c_str() );
//curl_easy_perform用来执行下载,直到数据传输完成函数才返回
CURLcode return_code = curl_easy_perform ( curl );
if ( return_code != CURLE_OK )
{
cout << "test *** curl_easy_perform 调用失败 [" << return_code << "]\n";
return -1;
}
cout << "test *** curl ok [" << buff << "]\n";
//curl_easy_cleanup用来释放curl资源
curl_easy_cleanup ( curl );
//curl_global_cleanup用来释放libcurl用到的一系列资源
curl_global_cleanup();
return 0;
}
# g++ -o a.out main.cpp -lcurl
# a.out
输出百度首页的源代码