使用libcurl进行HTTP GET操作

Working example how to do a GET request with libcurl and save it to a string

variable for future use.

 #include <stdio.h>

 #include <curl/curl.h>

 #include <string>

 #include <iostream>

 size_t writeToString(void *ptr, size_t size, size_t count, void *stream)

 {

     ((std::string*)stream)->append((char*)ptr, , size* count);

     return size* count;

 }

 int main(int argc, char *argv[])

 {

     if (argc != )

     {

         fprintf(stderr, "Usage: %s HTTP Address\n", argv[]);

         return -;

     }

   CURL *curl;

   CURLcode res;

   curl = curl_easy_init();

   if(curl) {

     const std::string url = argv[];

     std::string data;

     curl_easy_setopt(curl, CURLOPT_URL, url.c_str());

     curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, writeToString);

     curl_easy_setopt(curl, CURLOPT_WRITEDATA, &data);

     // data now holds response

     // write curl response to string variable..

     res = curl_easy_perform(curl);

     /* Check for errors */

     if(res != CURLE_OK)

       fprintf(stderr, "curl_easy_perform() failed: %s\n",

               curl_easy_strerror(res));

     std::cout << data << std::endl;

     /* always cleanup */

     curl_easy_cleanup(curl);

   }

   return ;

 }

make:

g++ -g LibCurlHttpGet.cpp -o LibCurlHttpGet -lcurl

command:

./LibCurlHttpGet http://www.baidu.com

 <!DOCTYPE html><!--STATUS OK--><html><head><meta http-equiv="content-type" content="text/html;charset=utf-8"><link rel="dns-prefetch" href="//s1.bdstatic.com"/><link rel="dns-prefetch" href="//t1.baidu.com"/><link rel="dns-prefetch" href="//t2.baidu.com"/><link rel="dns-prefetch" href="//t3.baidu.com"/><link rel="dns-prefetch" href="//t10.baidu.com"/><link rel="dns-prefetch" href="//t11.baidu.com"/><link rel="dns-prefetch" href="//t12.baidu.com"/><title>百度一下，你就知道</title><style >html,body{height:100%}html{overflow-y:auto}#wrapper{position:relative;_position:;min-height:100%}#content{padding-bottom:100px;text-align:center}#ftCon{height:100px;position:absolute;bottom:44px;text-align:center;width:100%;margin:0 auto;z-index:0;overflow:hidden}#ftConw{width:720px;margin:0 auto}body{font:12px 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