VC使用libcurl模拟登录CSDN并自动评论资源以获取积分

环境：Win7 64位+VC2008

软件及源码下载：(http://pan.baidu.com/s/1jGE52pK)

涉及到的知识点：

C++多线程编程

libcurl的使用（包括发送http请求、发送cookie给服务器、保存cookie）

关于libcurl的资料，推荐大家参考下官方文档：http://curl.haxx.se/libcurl/c/example.html

软件运行结果

libcurl中的所有函数

curl_easy_cleanup  

curl_easy_duphandle 
curl_easy_escape 
curl_easy_getinfo 
curl_easy_init 
curl_easy_pause 
curl_easy_perform 
curl_easy_recv 
curl_easy_reset 
curl_easy_send 
curl_easy_setopt 
curl_easy_strerror 
curl_easy_unescape 
curl_escape (deprecated, do not use) 
curl_formadd 
curl_formfree 
curl_formget 
curl_free 
curl_getdate 
curl_getenv (deprecated, do not use) 
curl_global_cleanup 
curl_global_init 
curl_global_init_mem 
curl_mprintf (deprecated, do not use) 
curl_multi_add_handle 
curl_multi_assign 
curl_multi_cleanup 
curl_multi_fdset 
curl_multi_info_read 
curl_multi_init 
curl_multi_perform 
curl_multi_remove_handle 
curl_multi_setopt 
curl_multi_socket 
curl_multi_socket_action 
curl_multi_strerror 
curl_multi_timeout 
curl_share_cleanup 
curl_share_init 
curl_share_setopt 
curl_share_strerror 
curl_slist_append 
curl_slist_free_all 
curl_strequal (deprecated, do not use) 
curl_strnequal (deprecated, do not use) 
curl_unescape (deprecated, do not use) 
curl_version 
curl_version_info

以下几个函数需要重点掌握

curl_easy_init 

curl_easy_cleanup  

curl_easy_getinfo 

curl_easy_perform 

curl_easy_setopt 

curl_global_cleanup 

curl_version 

CURLcode curl_global_init(long flags)
描述：这个函数只能用一次。(其实在调用curl_global_cleanup 函数后仍然可再用)
如果这个函数在curl_easy_init函数调用时还没调用，它将由libcurl库自动完成。

参数：flags
CURL_GLOBAL_ALL           //初始化所有的可能的调用。
CURL_GLOBAL_SSL           //初始化支持 安全套接字层。
CURL_GLOBAL_WIN32         //初始化win32套接字库。
CURL_GLOBAL_NOTHING     //没有额外的初始化。

void curl_global_cleanup(void);
描述：在结束libcurl使用的时候，用来对curl_global_init做的工作清理。类似于close的函数。

char *curl_version( );

描述: 打印当前libcurl库的版本

CURL * curl_easy_init( );

描述:curl_easy_init用来初始化一个CURL的指针(有些像返回FILE类型的指针一样). 相应的在调用结束时要用curl_easy_cleanup函数清理.
一般curl_easy_init意味着一个会话的开始. 它的返回值一般都用在easy系列的函数中

void curl_easy_cleanup(CURL *handle);

描述:这个调用用来结束一个会话.与curl_easy_init配合着用.
参数:CURL类型的指针.

CURLcode curl_easy_setopt(CURL *handle, CURLoption option, parameter);
描述: 这个函数最重要了.几乎所有的curl 程序都要频繁的使用它.
它告诉curl库.程序将有如何的行为. 比如要查看一个网页的html代码等.
(这个函数有些像ioctl函数)
参数:
1 CURL类型的指针
2 各种CURLoption类型的选项.(都在curl.h库里有定义,man 也可以查看到)
3 parameter 这个参数 既可以是个函数的指针,也可以是某个对象的指针,也可以是个long型的变量.它用什么这取决于第二个参数.
CURLoption 这个参数的取值很多.具体的可以查看man手册.

CURLcode curl_easy_perform(CURL *handle);

描述:这个函数在初始化CURL类型的指针 以及curl_easy_setopt完成后调用. 就像字面的意思所说perform就像是个舞台.让我们设置的
option 运作起来.
参数:
CURL类型的指针

如何操作cookie

通过curl_easy_setopt函数的第二个参数，就可以很容易的操作cookie

保存cookie信息到本地的cookie.txt文件

curl_easy_setopt(curl, CURLOPT_COOKIEJAR, "cookie.txt");

读取本地的cookie.txt文件中的cookie信息

curl_easy_setopt(easy_handle, CURLOPT_COOKIEFILE, "cookie.txt");

模拟登录csdn

ReturnInfo CCSDNDlg::LoginServer(CString strUser,CString strPass)
{
	ReturnInfo returnInfo;
	returnInfo.bReturn = FALSE;

	CURL *curl;
	CURLcode res;
	struct curl_slist *headers = NULL;
	curl_global_init(CURL_GLOBAL_ALL);
	curl = curl_easy_init();
	if(curl){
		//初始化cookie引擎
		curl_easy_setopt(curl, CURLOPT_COOKIEFILE, "");
		curl_easy_setopt(curl,CURLOPT_FOLLOWLOCATION, 1L);

		//http请求头
		headers = curl_slist_append(headers,"User-Agent:Mozilla/5.0 (Windows NT 6.1; WOW64; rv:25.0) Gecko/20100101 Firefox/25.0");	//模拟浏览器
		headers = curl_slist_append(headers,"Host:passport.csdn.net");
		headers = curl_slist_append(headers,"Accept:*/*");
		headers = curl_slist_append(headers,"Accept-Language:zh-cn,zh;q=0.8,en-us;q=0.5,en;q=0.3");
		headers = curl_slist_append(headers,"Accept-Encoding:gzip, deflate");
		headers = curl_slist_append(headers,"X-Requested-With:XMLHttpRequest");
		headers = curl_slist_append(headers,"Referer:https://passport.csdn.net/account/loginbox?callback=logined&hidethird=1&from=http%3a%2f%2fwww.csdn.net%2f");
		headers = curl_slist_append(headers,"Connection:keep-alive");
		
		curl_easy_setopt(curl, CURLOPT_COOKIEJAR, "cookie.txt");		//把服务器发过来的cookie保存到cookie.txt

		//发送http请求头
		curl_easy_setopt(curl, CURLOPT_HTTPHEADER, headers);
		char url[256];
		sprintf(url,"http://passport.csdn.net/ajax/accounthandler.ashx?t=log&u=%s&p=%s&remember=0&f=http%3A%2F%2Fwww.csdn.net%2F&rand=0.47590136872096434",strUser,strPass);
		curl_easy_setopt(curl, CURLOPT_URL,url);

		string content;
		//设置回调函数
		res = curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, writer);
		res = curl_easy_setopt(curl, CURLOPT_WRITEDATA, &content);

		//执行http请求
		res = curl_easy_perform(curl);

		string returnVal;
		Utf8ToMb((char*)content.c_str(),content.length(),returnVal);
		int pos = returnVal.find("\"status\":true");
		if ( pos >= 0){
			returnInfo.bReturn = TRUE;
			int nStartPos = content.find("data\":");
			int nEndPos	  = content.rfind("\"}}");
			returnInfo.data = content.substr(nStartPos+6,nEndPos - nStartPos-4);
		}else{
			int nStartPos = returnVal.find("error\":");
			int nEndPos	  = returnVal.find("data\":",nStartPos);
			returnInfo.strErrorInfo = returnVal.substr(nStartPos+8,nEndPos-nStartPos-11);
		}
		//释放资源
		curl_easy_cleanup(curl);
		curl_slist_free_all(headers);
		headers = NULL;
	}
	curl_global_cleanup();
	return returnInfo;
}

根据给定的网址获取网页源码

static string GetHtmlPage(string url)
{
	CURL *easy_handle;
	CURLcode res;
	string content;
	curl_global_init(CURL_GLOBAL_ALL);
	easy_handle = curl_easy_init();
	if( easy_handle )
	{
		//初始化cookie引擎
		curl_easy_setopt(easy_handle, CURLOPT_COOKIEFILE,"");
		curl_easy_setopt(easy_handle,CURLOPT_TIMEOUT,5);			//设置请求超时时间
		//curl_easy_setopt(easy_handle,CURLOPT_VERBOSE,1);			//输出请求头和响应头
		//curl_easy_setopt(easy_handle,CURLOPT_HEADER,1);
		curl_easy_setopt(easy_handle,CURLOPT_FOLLOWLOCATION, 1L);

		//http请求头
		struct curl_slist *headers = NULL;
		headers = curl_slist_append(headers,"Host: download.csdn.net");
		headers = curl_slist_append(headers,"User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:25.0) Gecko/20100101 Firefox/25.0");
		headers = curl_slist_append(headers,"Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8");
		headers = curl_slist_append(headers,"Accept-Language: zh-cn,zh;q=0.8,en-us;q=0.5,en;q=0.3");		
		headers = curl_slist_append(headers,"Referer: http://www.csdn.net/");
		headers = curl_slist_append(headers,"Connection: keep-alive");
		curl_easy_setopt(easy_handle, CURLOPT_HTTPHEADER, headers);

		curl_easy_setopt(easy_handle, CURLOPT_COOKIEFILE, "cookie.txt");		//读取本地存储的cookie

		if(!InitCurl(easy_handle,res,url,content))
		{
			//释放资源
			curl_slist_free_all(headers);
			curl_easy_cleanup(easy_handle);
			return NULL;
		}
		//释放资源
		curl_slist_free_all(headers);
		curl_easy_cleanup(easy_handle);
	}
	curl_global_cleanup();
	string tt;
	Utf8ToMb((char *)content.c_str(),content.length(),tt);
	return tt;
}

获取下载资源总页数

static int GetTotalPageNum()
{
	string url = "http://download.csdn.net/my/downloads/1";

	string html = GetHtmlPage(url);
	int nPos = html.rfind("尾页");
	if (nPos == -1)
		return -1;
	nPos -= 2;
	int nStartPos = html.rfind("/",nPos);
	string strTotal = html.substr(nStartPos+1,nPos - nStartPos - 1);
	return atoi(strTotal.c_str());
}

获取待评论的资源列表

static vector<DownResourceInfo> GetToCommentList(int pageNum)
{
	vector<DownResourceInfo> vtDownload;
	char url[128] = {0};
	sprintf(url,"http://download.csdn.net/my/downloads/%d",pageNum);
	string html = GetHtmlPage(url);
	int nPos = 0;
	int n = 0;
	int flag = 1;
	while((nPos = html.find("#comment",n)) != -1)
	{
		n = nPos+1;
		int nStartPos = html.rfind("/",nPos);
		string strUrl = html.substr(nStartPos+1,nPos - nStartPos -1);
		DownResourceInfo info;
		info.strResourceCurl = strUrl;
		//获取资源的名字
		nStartPos = html.find(strUrl,nPos+1);
		if(nStartPos == -1)
			return vtDownload;
		nStartPos += 2;
		nStartPos += strUrl.length();
		int nEndPos = html.find("</a>",nStartPos);
		string ResourceName = html.substr(nStartPos,nEndPos - nStartPos);
		info.strResourceName = ResourceName;		
		vtDownload.push_back(info);
	}
	return vtDownload;
}

发表评论

static BOOL AddComment(string sourceId)
{
	CURL *easy_handle;
	CURLcode res;
	string content;
	curl_global_init(CURL_GLOBAL_ALL);
	easy_handle = curl_easy_init();
	if( easy_handle )
	{
		//初始化cookie引擎
		curl_easy_setopt(easy_handle, CURLOPT_COOKIEFILE,"");		
		curl_easy_setopt(easy_handle,CURLOPT_FOLLOWLOCATION, 1L);		
		string url = "http://download.csdn.net/index.php/comment/post_comment?jsonpcallback=jsonp1385304626524&sourceid="+sourceId+"&content=%E9%9D%9E%E5%B8%B8%E6%84%9F%E8%B0%A2%EF%BC%8C%E8%BF%99%E8%B5%84%E6%BA%90%E6%88%91%E6%89%BE%E4%BA%86%E5%A5%BD%E4%B9%85%E4%BA%86%EF%BC%81&rating=5&t=1385304679900";
		string referer = "Referer: http://download.csdn.net/detail/wasdzxce/"+sourceId;
		//http请求头
		struct curl_slist *headers = NULL;		
		headers = curl_slist_append(headers,"Host: download.csdn.net");
		headers = curl_slist_append(headers,"User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:25.0) Gecko/20100101 Firefox/25.0");
		headers = curl_slist_append(headers,"Accept: text/javascript, application/javascript, */*");
		headers = curl_slist_append(headers,"Accept-Language: zh-cn,zh;q=0.8,en-us;q=0.5,en;q=0.3");
		headers = curl_slist_append(headers,"Accept-Encoding: gzip, deflate");
		headers = curl_slist_append(headers,"Content-Type: application/x-www-form-urlencoded");
		headers = curl_slist_append(headers,"X-Requested-With: XMLHttpRequest");
		headers = curl_slist_append(headers,referer.c_str());
		headers = curl_slist_append(headers,"Connection: keep-alive");
		curl_easy_setopt(easy_handle, CURLOPT_HTTPHEADER, headers);
		curl_easy_setopt(easy_handle, CURLOPT_COOKIEFILE, "cookie.txt");        //读取本地存储的cookie
		if(!InitCurl(easy_handle,res,url,content))
		{
			//释放资源
			curl_slist_free_all(headers);
			curl_easy_cleanup(easy_handle);
			curl_global_cleanup();
			return FALSE;
		}
		//释放资源
		curl_slist_free_all(headers);
		curl_easy_cleanup(easy_handle);
	}
	curl_global_cleanup();
	int pos = content.find("\"succ\":1");
	if (pos>=0)
		return TRUE;
	else
		return FALSE;
}

原文地址：曾是土木人