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libcurl获取网页内容的C/C++代码_c++访问百度

作者：小小林熬夜学编程 | 2024-03-30 06:46:50

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c++访问百度

       我们之前用socket API写过访问百度服务的程序， 今天我们用libcurl来写写。 实际上后者是对前者的封装。 代码如下(注意：你要包含curl.h文件， 并在makefile中加入对应的静态库， 否则编译不过)：

 

  1. #include <iostream>
  2. #include <stdio.h>
  3. #include "curl.h"
  4. using namespace std;
  5.  
  6. static size_t downloadCallback(void *buffer, size_t sz, size_t nmemb, void *writer)
  7. {
  8. 	string* psResponse = (string*) writer;
  9. 	size_t size = sz * nmemb;
  10. 	psResponse->append((char*) buffer, size);
  11.  
  12. 	return sz * nmemb;
  13. }
  14.  
  15. int main()
  16. {
  17. 	string strUrl = "http://www.baidu.com";
  18. 	string strTmpStr;
  19. 	CURL *curl = curl_easy_init();
  20. 	curl_easy_setopt(curl, CURLOPT_URL, strUrl.c_str());
  21. 	curl_easy_setopt(curl, CURLOPT_NOSIGNAL, 1L);
  22. 	curl_easy_setopt(curl, CURLOPT_TIMEOUT, 2);
  23. 	curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, downloadCallback); 
  24. 	curl_easy_setopt(curl, CURLOPT_WRITEDATA, &strTmpStr);
  25. 	CURLcode res = curl_easy_perform(curl);
  26. 	curl_easy_cleanup(curl);
  27. 	string strRsp;
  28. 	if (res != CURLE_OK)
  29. 	{
  30. 		strRsp = "error";
  31. 	}
  32. 	else
  33. 	{
  34. 		strRsp = strTmpStr;
  35. 	}
  36. 	
  37. 	printf("strRsp is |%s|\n", strRsp.c_str());
  38. 	return 0;
  39. }

      结果：

 

strRsp is |<!DOCTYPE html><!--STATUS OK-->
<html>
<head>
        <meta http-equiv="content-type" content="text/html;charset=utf-8">
        <meta http-equiv="X-UA-Compatible" content="IE=Edge">
        <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"/>
        <link rel="dns-prefetch" href="//b1.bdstatic.com"/>
        <title>百度一下，你就知道</title>
        <link href="http://s1.bdstatic.com/r/www/cache/static/home/css/index.css" rel="stylesheet" type="text/css" />
        <!--[if lte IE 8]><style index="index" >#content{height:480px\9}#m{top:260px\9}</style><![endif]-->
        <!--[if IE 8]><style index="index" >#u1 a.mnav,#u1 a.mnav:visited{font-family:simsun}</style><![endif]-->
        <script>var hashMatch = document.location.href.match(/#+(.*wd=[^&].+)/);if (hashMatch && hashMatch[0] && hashMatch[1]) {document.location.replace("http://"+location.host+"/s?"+hashMatch[1]);}var ns_c = function(){};</script>
        <script>function h(obj){obj.style.behavior='url(#default#homepage)';var a = obj.setHomePage('//www.baidu.com/');}</script>
        <noscript><meta http-equiv="refresh" content="0; url=/baidu.html?from=noscript"/></noscript>
        <script>window._ASYNC_START=new Date().getTime();</script>
</head>
<body link="#0000cc"><div id="wrapper" style="display:none;"><div id="u"><a href="//www.baidu.com/gaoji/preferences.html"  οnmοusedοwn="return user_c({'fm':'set','tab':'setting','login':'0'})">搜索设置</a>|<a id="btop" href="/"  οnmοusedοwn="return user_c({'fm':'set','tab':'index','login':'0'})">百度首页</a>|<a id="lb" href="https://passport.baidu.com/v2/?login&tpl=mn&u=http%3A%2F%2Fwww.baidu.com%2F" οnclick="return false;"  οnmοusedοwn="return user_c({'fm':'set','tab':'login'})">登录</a><a href="https://passport.baidu.com/v2/?reg®Type=1&tpl=mn&u=http%3A%2F%2Fwww.baidu.com%2F"  οnmοusedοwn="return user_c({'fm':'set','tab':'reg'})" target="_blank" class="reg">注册</a></div><div id="head"><div class="s_nav"><a href="/" class="s_logo" οnmοusedοwn="return c({'fm':'tab','tab':'logo'})"><img src="//www.baidu.com/img/baidu_jgylogo3.gif" width="117" height="38" border="0" alt="到百度首页" title="到百度首页"></a><div class="s_tab" id="s_tab"><a href="http://news.baidu.com/ns?cl=2&rn=20&tn=news&word=" wdfield="word"  οnmοusedοwn="return c({'fm':'tab','tab':'news'})">新闻</a>　<b>网页</b>　<a href="http://tieba.baidu.com/f?kw=&fr=wwwt" wdfield="kw"  οnmοusedοwn="return c({'fm':'tab','tab':'tieba'})">贴吧</a>　<a href="http://zhidao.baidu.com/q?ct=17&pn=0&tn=ikaslist&rn=10&word=&fr=wwwt" wdfield="word"  οnmοusedοwn="return c({'fm':'tab','tab':'zhidao'})">知道</a>　<a href="http://music.baidu.com/search?fr=ps&key=" wdfield="key"  οnmοusedοwn="return c({'fm':'tab','tab':'music'})">音乐</a>　<a href="http://image.baidu.com/i?tn=baiduimage&ps=1&ct=201326592&lm=-1&cl=2&nc=1&word=" wdfield="word"  οnmοusedοwn="return c({'fm':'tab','tab':'pic'})">图片</a>　<a href="http://v.baidu.com/v?ct=301989888&rn=20&pn=0&db=0&s=25&word=" wdfield="word"   οnmοusedοwn="return c({'fm':'tab','tab':'video'})">视频</a>　<a href="http://map.baidu.com/m?word=&fr=ps01000" wdfield="word"  οnmοusedοwn="return c({'fm':'tab','tab':'map'})">地图</a>　<a href="http://wenku.baidu.com/search?word=&lm=0&od=0" wdfield="word"  οnmοusedοwn="return c({'fm':'tab','tab':'wenku'})">文库</a>　<a href="//www.baidu.com/more/"  οnmοusedοwn="return c({'fm':'tab','tab':'more'})">更多»</a></div></div><form id="form" name="f" action="/s" class="fm" ><input type="hidden" name="ie" value="utf-8"><input type="hidden" name="f" value="8"><input type="hidden" name="rsv_bp" value="1"><span class="bg s_ipt_wr"><input name="wd" id="kw" class="s_ipt" value="" maxlength="100"></span><span class="bg s_btn_wr"><input type="submit" id="su" value="百度一下" class="bg s_btn" οnmοusedοwn="this.className='bg s_btn s_btn_h'" οnmοuseοut="this.className='bg s_btn'"></span><span class="tools"><span id="mHolder"><div id="mCon"><span>输入法</span></div><ul id="mMenu"><li><a href="javascript:;" name="ime_hw">手写</a></li><li><a href="javascript:;" name="ime_py">拼音</a></li><li class="ln"></li><li><a href="javascript:;" name="ime_cl">关闭</a></li></ul></span><span class="shouji"><strong>推荐 : </strong><a href="http://w.x.baidu.com/go/mini/8/10000020" οnmοusedοwn="return ns_c({'fm':'behs','tab':'bdbrowser'})">百度浏览器，打开网页快2秒！</a></span></span></form></div><div id="content"><div id="u1"><a href="http://news.baidu.com" name="tj_trnews" class="mnav">新闻</a><a href="http://www.hao123.com" name="tj_trhao123" class="mnav">hao123</a><a href="http://map.baidu.com" name="tj_trmap" class="mnav">地图</a><a href="http://v.baidu.com" name="tj_trvideo" class="mnav">视频</a><a href="http://tieba.baidu.com" name="tj_trtieba" class="mnav">贴吧</a><a href="https://passport.baidu.com/v2/?login&tpl=mn&u=http%3A%2F%2Fwww.baidu.com%2F" name="tj_login" id="lb" οnclick="return false;">登录</a><a href="//www.baidu.com/gaoji/preferences.html" name="tj_settingicon" id="pf">设置</a><a href="//www.baidu.com/more/" name="tj_briicon" id="bri">更多产品</a></div><div id="m"><p id="lg"><img src="//www.baidu.com/img/bd_logo.png" width="270" height="129"></p><p id="nv"><a href="http://news.baidu.com">新 闻</a>　<b>网 页</b>　<a href="http://tieba.baidu.com">贴 吧</a>　<a href="http://zhidao.baidu.com">知 道</a>　<a href="http://music.baidu.com">音 乐</a>　<a href="http://image.baidu.com">图 片</a>　<a href="http://v.baidu.com">视 频</a>　<a href="http://map.baidu.com">地 图</a></p><div id="fm"><form id="form1" name="f1" action="/s" class="fm"><span class="bg s_ipt_wr"><input type="text" name="wd" id="kw1" maxlength="100" class="s_ipt"></span><input type="hidden" name="rsv_bp" value="0"><input type=hidden name=ch value=""><input type=hidden name=tn value="baidu"><input type=hidden name=bar value=""><input type="hidden" name="rsv_spt" value="3"><input type="hidden" name="ie" value="utf-8"><span class="bg s_btn_wr"><input type="submit" value="百度一下" id="su1" class="bg s_btn" οnmοusedοwn="this.className='bg s_btn s_btn_h'" οnmοuseοut="this.className='bg s_btn'"></span></form><span class="tools"><span id="mHolder1"><div id="mCon1"><span>输入法</span></div></span></span><ul id="mMenu1"><div class="mMenu1-tip-arrow"><em></em><ins></ins></div><li><a href="javascript:;" name="ime_hw">手写</a></li><li><a href="javascript:;" name="ime_py">拼音</a></li><li class="ln"></li><li><a href="javascript:;" name="ime_cl">关闭</a></li></ul></div><p id="lk"><a href="http://baike.baidu.com">百科</a>　<a href="http://wenku.baidu.com">文库</a>　<a href="http://www.hao123.com">hao123</a><span> | <a href="//www.baidu.com/more/">更多>></a></span></p><p id="lm"></p></div></div><div id="ftCon"><div id="ftConw"><p id="lh"><a id="seth" onClick="h(this)" href="/" οnmοusedοwn="return ns_c({'fm':'behs','tab':'homepage','pos':0})">把百度设为主页</a><a id="setf" href="//www.baidu.com/cache/sethelp/index.html" οnmοusedοwn="return ns_c({'fm':'behs','tab':'favorites','pos':0})" target="_blank">把百度设为主页</a><a οnmοusedοwn="return ns_c({'fm':'behs','tab':'tj_about'})" href="http://home.baidu.com">关于百度</a><a οnmοusedοwn="return ns_c({'fm':'behs','tab':'tj_about_en'})" href="http://ir.baidu.com">About Baidu</a></p><p id="cp">©2014 Baidu <a href="/duty/" name="tj_duty">使用百度前必读</a> 京ICP证030173号 <img src="http://s1.bdstatic.com/r/www/cache/static/global/img/gs_237f015b.gif"></p></div></div><div id="wrapper_wrapper"></div></div><div class="c-tips-container" id="c-tips-container"></div>
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       有点意思。

 

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