模拟登陆网站 之 C#版（内含两种版本的完整的可运行的代码）

【教程】模拟登陆网站 之 C#版（内含两种版本的完整的可运行的代码）

http://www.crifan.com/emulate_login_website_using_csharp/

这个网站很好   ，他研究了  很多 post的 基础知识。。。

还有 就是 他 驱动应该也 涉及过 

之前已经介绍过了网络相关的一些基础知识了：

【整理】关于抓取网页，分析网页内容，模拟登陆网站的逻辑/流程和注意事项

以及简单的网页内容抓取，用C#是如何实现的：

【教程】抓取网并提取网页中所需要的信息 之 C#版

现在接着来介绍，以模拟登陆百度首页：

http://www.baidu.com/

为例，说明如何通过C#模拟登陆网站。

不过，此处需要介绍一下此文前提：

假定你已经看完了：

【整理】关于抓取网页，分析网页内容，模拟登陆网站的逻辑/流程和注意事项

了解了基本的网络相关基本概念；

看完了：

【总结】浏览器中的开发人员工具（IE9的F12和Chrome的Ctrl+Shift+I）-网页分析的利器

知道了如何使用IE9的F12等工具去分析网页执行的过程。

---

1.模拟登陆网站之前，需要搞清楚，登陆该网站的内部执行逻辑

 

此想要通过程序，即C#代码，实现模拟登陆百度首页之前。

你自己本身先要搞懂，本身登陆该网站，内部的逻辑是什么样的。

而关于如何利用工具，分析出来，百度首页登录的内部逻辑过程，参见：

【教程】手把手教你如何利用工具(IE9的F12)去分析模拟登陆网站(百度首页)的内部逻辑过程

2.然后才是用对应的语言（C#）去实现，模拟登陆的逻辑

 

看懂了上述用F12分析出来的百度首页的登陆的内部逻辑过程，接下来，用C#代码去实现，相对来说，就不是很难了。

注：

（1）关于在C#中如何利用cookie，不熟悉的，先去看：

【经验总结】Http，网页访问，HttpRequest，HttpResponse相关的知识

（2）对于正则表达式不熟悉的，去参考：

正则表达式学习心得

（3）对C#中的正则表达式的类Regex，不熟悉的，可参考：

C#中的正则表达式的学习心得

此处，再把分析出来的流程，贴出来，以便方便和代码对照：

顺序

     

访问地址

     

访问类型

     

发送的数据

     

需要获得/提取的返回的值

 

 

   

 1http://www.baidu.com/GET无返回的cookie中的BAIDUID2https://passport.baidu.com/v2/api/?getapi&class=login&tpl=mn&tangram=trueGET包含BAIDUID这个cookie从返回的html中提取出token的值3https://passport.baidu.com/v2/api/?loginPOST一堆的post data，其中token的值是之前提取出来的需要验证返回的cookie中，是否包含BDUSS，PTOKEN，STOKEN，SAVEUSERID

然后，最终就可以写出相关的，用于演示模拟登录百度首页的C#代码了。

【版本1：C#实现模拟登陆百度首页的完整代码 之 精简版】

其中，通过UI中，点击“获取cookie BAIDUID”：

然后调用下面这部分代码：

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privatevoid btnGetBaiduid_Click(objectsender, EventArgs e)

{

    //http://www.baidu.com/

    stringbaiduMainUrl = txbBaiduMainUrl.Text;

    //generate http request

    HttpWebRequest req = (HttpWebRequest)WebRequest.Create(baiduMainUrl);

  

    //add follow code to handle cookies

    req.CookieContainer =new CookieContainer();

    req.CookieContainer.Add(curCookies);

  

    req.Method ="GET";

    //use request to get response

    HttpWebResponse resp = (HttpWebResponse)req.GetResponse();

    txbGotBaiduid.Text ="";

    foreach(Cookie ck inresp.Cookies)

    {

        txbGotBaiduid.Text +="[" + ck.Name +"]=" + ck.Value;

        if(ck.Name == "BAIDUID")

        {

            gotCookieBaiduid =true;

        }

    }

  

    if(gotCookieBaiduid)

    {

        //store cookies

        curCookies = resp.Cookies;

    }

    else

    {

        MessageBox.Show("错误：没有找到cookie BAIDUID ！");

    }

}

获得上述所看到的BAIDUID这个cookie的值了。

然后接着点击“获取token值”，然后调用下面的代码：

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privatevoid btnGetToken_Click(objectsender, EventArgs e)

{

    if(gotCookieBaiduid)

    {

        stringgetapiUrl = "https://passport.baidu.com/v2/api/?getapi&class=login&tpl=mn&tangram=true";

        HttpWebRequest req = (HttpWebRequest)WebRequest.Create(getapiUrl);

  

        //add previously got cookies

        req.CookieContainer =new CookieContainer();

        req.CookieContainer.Add(curCookies);

  

        req.Method ="GET";

        HttpWebResponse resp = (HttpWebResponse)req.GetResponse();

        StreamReader sr =new StreamReader(resp.GetResponseStream());

        stringrespHtml = sr.ReadToEnd();

  

        //bdPass.api.params.login_token='5ab690978812b0e7fbbe1bfc267b90b3';

        stringtokenValP = @"bdPass\.api\.params\.login_token='(?<tokenVal>\w+)';";

        Match foundTokenVal = (newRegex(tokenValP)).Match(respHtml);

        if(foundTokenVal.Success)

        {

            //extracted the token value

            txbExtractedTokenVal.Text = foundTokenVal.Groups["tokenVal"].Value;

            extractTokenValueOK =true;

        }

        else

        {

            txbExtractedTokenVal.Text ="错误：没有找到token的值！";

        }

  

    }

    else

    {

        MessageBox.Show("错误：之前没有正确获得Cookie：BAIDUID ！");

    }

}

就可以获取对应的token的值了：

接着再去填上你的百度的用户名和密码，然后再点击“模拟登陆百度首页”，就会调用如下代码：

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privatevoid btnEmulateLoginBaidu_Click(objectsender, EventArgs e)

{

    if(gotCookieBaiduid && extractTokenValueOK)

    {

        stringstaticpage = "http://www.baidu.com/cache/user/html/jump.html";

          

        //init post dict info

        Dictionary<string,string> postDict =new Dictionary<string,string>();

        //postDict.Add("ppui_logintime", "");

        postDict.Add("charset","utf-8");

        //postDict.Add("codestring", "");

        postDict.Add("token", txbExtractedTokenVal.Text);

        postDict.Add("isPhone","false");

        postDict.Add("index","0");

        //postDict.Add("u", "");

        //postDict.Add("safeflg", "0");

        postDict.Add("staticpage", staticpage);

        postDict.Add("loginType","1");

        postDict.Add("tpl","mn");

        postDict.Add("callback","parent.bdPass.api.login._postCallback");

        postDict.Add("username", txbBaiduUsername.Text);

        postDict.Add("password", txbBaiduPassword.Text);

        //postDict.Add("verifycode", "");

        postDict.Add("mem_pass","on");

  

        stringbaiduMainLoginUrl = "https://passport.baidu.com/v2/api/?login";

        HttpWebRequest req = (HttpWebRequest)WebRequest.Create(baiduMainLoginUrl);

        //add cookie

        req.CookieContainer =new CookieContainer();

        req.CookieContainer.Add(curCookies);

        //set to POST

        req.Method ="POST";

        req.ContentType ="application/x-www-form-urlencoded";

        //prepare post data

        stringpostDataStr = quoteParas(postDict);

        byte[] postBytes = Encoding.UTF8.GetBytes(postDataStr);

        req.ContentLength = postBytes.Length;

        //send post data

        Stream postDataStream = req.GetRequestStream();

        postDataStream.Write(postBytes, 0, postBytes.Length);

        postDataStream.Close();

        //got response

        HttpWebResponse resp = (HttpWebResponse)req.GetResponse();

        //got returned html

        StreamReader sr =new StreamReader(resp.GetResponseStream());

        stringloginBaiduRespHtml = sr.ReadToEnd();

  

        //check whether got all expected cookies

        Dictionary<string,bool> cookieCheckDict =new Dictionary<string,bool>();

        string[] cookiesNameList = {"BDUSS","PTOKEN", "STOKEN", "SAVEUSERID"};

        foreach(String cookieToCheck incookiesNameList)

        {

            cookieCheckDict.Add(cookieToCheck,false);

        }

  

        foreach(Cookie singleCookie inresp.Cookies)

        {

            if(cookieCheckDict.ContainsKey(singleCookie.Name))

            {

                cookieCheckDict[singleCookie.Name] =true;

            }

        }

  

        boolallCookiesFound = true;

        foreach(bool foundCurCookie in cookieCheckDict.Values)

        {

            allCookiesFound = allCookiesFound && foundCurCookie;

        }

  

  

        loginBaiduOk = allCookiesFound;

        if(loginBaiduOk)

        {

            txbEmulateLoginResult.Text ="成功模拟登陆百度首页！";

        }

        else

        {

            txbEmulateLoginResult.Text ="模拟登陆百度首页 失败！";

            txbEmulateLoginResult.Text += Environment.NewLine +"所返回的Header信息为：";

            txbEmulateLoginResult.Text += Environment.NewLine + resp.Headers.ToString();

            txbEmulateLoginResult.Text += Environment.NewLine + Environment.NewLine;

            txbEmulateLoginResult.Text += Environment.NewLine +"所返回的HTML源码为：";

            txbEmulateLoginResult.Text += Environment.NewLine + loginBaiduRespHtml;

        }

    }

    else

    {

        MessageBox.Show("错误：没有正确获得Cookie BAIDUID 和/或 没有正确提取出token值！");

    }

}

如果用户名和密码都是正确的话，即可成功登陆：

当然，如果故意输入错误的用户名和密码，则会显示登陆错误，并且打印出返回的headers值和html代码：

完整的C#模拟登陆百度首页的代码，如下：

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using System;

using System.Collections.Generic;

using System.ComponentModel;

using System.Data;

using System.Drawing;

using System.Text;

using System.Windows.Forms;

  

using System.Net;

using System.IO;

usingSystem.Text.RegularExpressions;

usingSystem.Web;

  

namespaceemulateLoginBaidu

{

    publicpartial classfrmEmulateLoginBaidu : Form

    {

        CookieCollection curCookies =null;

  

        boolgotCookieBaiduid, extractTokenValueOK, loginBaiduOk;

  

        publicfrmEmulateLoginBaidu()

        {

            InitializeComponent();

        }

  

        privatevoid frmEmulateLoginBaidu_Load(objectsender, EventArgs e)

        {

            //init

            curCookies =new CookieCollection();

            gotCookieBaiduid =false;

            extractTokenValueOK =false;

            loginBaiduOk =false;

        }

  

        /******************************************************************************

        functions in crifanLib.cs

        *******************************************************************************/

  

        //quote the input dict values

        //note: the return result for first para no '&'

        publicstring quoteParas(Dictionary<string,string> paras)

        {

            stringquotedParas = "";

            boolisFirst = true;

            stringval = "";

            foreach(string para in paras.Keys)

            {

                if(paras.TryGetValue(para, outval))

                {

                    if(isFirst)

                    {

                        isFirst =false;

                        quotedParas += para +"=" + HttpUtility.UrlPathEncode(val);

                    }

                    else

                    {

                        quotedParas +="&" + para +"=" + HttpUtility.UrlPathEncode(val);

                    }

                }

                else

                {

                    break;

                }

            }

  

            returnquotedParas;

        }

  

        /******************************************************************************

        Demo emulate login baidu related functions

        *******************************************************************************/

  

        privatevoid btnGetBaiduid_Click(objectsender, EventArgs e)

        {

            //http://www.baidu.com/

            stringbaiduMainUrl = txbBaiduMainUrl.Text;

            //generate http request

            HttpWebRequest req = (HttpWebRequest)WebRequest.Create(baiduMainUrl);

  

            //add follow code to handle cookies

            req.CookieContainer =new CookieContainer();

            req.CookieContainer.Add(curCookies);

  

            req.Method ="GET";

            //use request to get response

            HttpWebResponse resp = (HttpWebResponse)req.GetResponse();

            txbGotBaiduid.Text ="";

            foreach(Cookie ck inresp.Cookies)

            {

                txbGotBaiduid.Text +="[" + ck.Name +"]=" + ck.Value;

                if(ck.Name == "BAIDUID")

                {

                    gotCookieBaiduid =true;

                }

            }

  

            if(gotCookieBaiduid)

            {

                //store cookies

                curCookies = resp.Cookies;

            }

            else

            {

                MessageBox.Show("错误：没有找到cookie BAIDUID ！");

            }

        }

  

        privatevoid btnGetToken_Click(objectsender, EventArgs e)

        {

            if(gotCookieBaiduid)

            {

                stringgetapiUrl = "https://passport.baidu.com/v2/api/?getapi&class=login&tpl=mn&tangram=true";

                HttpWebRequest req = (HttpWebRequest)WebRequest.Create(getapiUrl);

  

                //add previously got cookies

                req.CookieContainer =new CookieContainer();

                req.CookieContainer.Add(curCookies);

  

                req.Method ="GET";

                HttpWebResponse resp = (HttpWebResponse)req.GetResponse();

                StreamReader sr =new StreamReader(resp.GetResponseStream());

                stringrespHtml = sr.ReadToEnd();

  

                //bdPass.api.params.login_token='5ab690978812b0e7fbbe1bfc267b90b3';

                stringtokenValP = @"bdPass\.api\.params\.login_token='(?<tokenVal>\w+)';";

                Match foundTokenVal = (newRegex(tokenValP)).Match(respHtml);

                if(foundTokenVal.Success)

                {

                    //extracted the token value

                    txbExtractedTokenVal.Text = foundTokenVal.Groups["tokenVal"].Value;

                    extractTokenValueOK =true;

                }

                else

                {

                    txbExtractedTokenVal.Text ="错误：没有找到token的值！";

                }

  

            }

            else

            {

                MessageBox.Show("错误：之前没有正确获得Cookie：BAIDUID ！");

            }

        }

  

        privatevoid btnEmulateLoginBaidu_Click(objectsender, EventArgs e)

        {

            if(gotCookieBaiduid && extractTokenValueOK)

            {

                stringstaticpage = "http://www.baidu.com/cache/user/html/jump.html";

                  

                //init post dict info

                Dictionary<string,string> postDict =new Dictionary<string,string>();

                //postDict.Add("ppui_logintime", "");

                postDict.Add("charset","utf-8");

                //postDict.Add("codestring", "");

                postDict.Add("token", txbExtractedTokenVal.Text);

                postDict.Add("isPhone","false");

                postDict.Add("index","0");

                //postDict.Add("u", "");

                //postDict.Add("safeflg", "0");

                postDict.Add("staticpage", staticpage);

                postDict.Add("loginType","1");

                postDict.Add("tpl","mn");

                postDict.Add("callback","parent.bdPass.api.login._postCallback");

                postDict.Add("username", txbBaiduUsername.Text);

                postDict.Add("password", txbBaiduPassword.Text);

                //postDict.Add("verifycode", "");

                postDict.Add("mem_pass","on");

  

                stringbaiduMainLoginUrl = "https://passport.baidu.com/v2/api/?login";

                HttpWebRequest req = (HttpWebRequest)WebRequest.Create(baiduMainLoginUrl);

                //add cookie

                req.CookieContainer =new CookieContainer();

                req.CookieContainer.Add(curCookies);

                //set to POST

                req.Method ="POST";

                req.ContentType ="application/x-www-form-urlencoded";

                //prepare post data

                stringpostDataStr = quoteParas(postDict);

                byte[] postBytes = Encoding.UTF8.GetBytes(postDataStr);

                req.ContentLength = postBytes.Length;

                //send post data

                Stream postDataStream = req.GetRequestStream();

                postDataStream.Write(postBytes, 0, postBytes.Length);

                postDataStream.Close();

                //got response

                HttpWebResponse resp = (HttpWebResponse)req.GetResponse();

                //got returned html

                StreamReader sr =new StreamReader(resp.GetResponseStream());

                stringloginBaiduRespHtml = sr.ReadToEnd();

  

                //check whether got all expected cookies

                Dictionary<string,bool> cookieCheckDict =new Dictionary<string,bool>();

                string[] cookiesNameList = {"BDUSS","PTOKEN", "STOKEN", "SAVEUSERID"};

                foreach(String cookieToCheck incookiesNameList)

                {

                    cookieCheckDict.Add(cookieToCheck,false);

                }

  

                foreach(Cookie singleCookie inresp.Cookies)

                {

                    if(cookieCheckDict.ContainsKey(singleCookie.Name))

                    {

                        cookieCheckDict[singleCookie.Name] =true;

                    }

                }

  

                boolallCookiesFound = true;

                foreach(bool foundCurCookie in cookieCheckDict.Values)

                {

                    allCookiesFound = allCookiesFound && foundCurCookie;

                }

  

  

                loginBaiduOk = allCookiesFound;

                if(loginBaiduOk)

                {

                    txbEmulateLoginResult.Text ="成功模拟登陆百度首页！";

                }

                else

                {

                    txbEmulateLoginResult.Text ="模拟登陆百度首页 失败！";

                    txbEmulateLoginResult.Text += Environment.NewLine +"所返回的Header信息为：";

                    txbEmulateLoginResult.Text += Environment.NewLine + resp.Headers.ToString();

                    txbEmulateLoginResult.Text += Environment.NewLine + Environment.NewLine;

                    txbEmulateLoginResult.Text += Environment.NewLine +"所返回的HTML源码为：";

                    txbEmulateLoginResult.Text += Environment.NewLine + loginBaiduRespHtml;

                }

            }

            else

            {

                MessageBox.Show("错误：没有正确获得Cookie BAIDUID 和/或 没有正确提取出token值！");

            }

        }

  

        privatevoid lklEmulateLoginTutorialUrl_LinkClicked(objectsender, LinkLabelLinkClickedEventArgs e)

        {

            stringemulateLoginTutorialUrl = "http://www.crifan.com/emulate_login_website_using_csharp";

            System.Diagnostics.Process.Start(emulateLoginTutorialUrl);

        }

  

        privatevoid btnClearAll_Click(objectsender, EventArgs e)

        {

            curCookies =new CookieCollection();

            gotCookieBaiduid =false;

            extractTokenValueOK =false;

            loginBaiduOk =false;

  

            txbGotBaiduid.Text ="";

            txbExtractedTokenVal.Text ="";

  

            txbBaiduUsername.Text ="";

            txbBaiduPassword.Text ="";

            txbEmulateLoginResult.Text ="";

        }

    }

}

对应的，完整的VS2010的C#项目，可以去这里下载：

emulateLoginBaidu_csharp_2012-11-07.7z

【版本2：C#实现模拟登陆百度首页的完整代码 之 crifanLib.py版】

后来，又把上述代码，改为利用我的C#版本的crifanLib.cs，以方便以后再次利用相关的网络方面的库函数。

下面是完整的，利用到crifanLib.cs的版本，的C#代码：

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using System;

using System.Collections.Generic;

using System.ComponentModel;

using System.Data;

using System.Drawing;

using System.Text;

using System.Windows.Forms;

  

using System.Net;

using System.IO;

usingSystem.Text.RegularExpressions;

usingSystem.Web;

  

namespaceemulateLoginBaidu

{

    publicpartial classfrmEmulateLoginBaidu : Form

    {

        CookieCollection curCookies =null;

  

        boolgotCookieBaiduid, extractTokenValueOK, loginBaiduOk;

  

        publicfrmEmulateLoginBaidu()

        {

            InitializeComponent();

        }

  

        privatevoid frmEmulateLoginBaidu_Load(objectsender, EventArgs e)

        {

            this.AcceptButton =this.btnEmulateLoginBaidu;

  

            //init for crifanLib.cs

            curCookies =new CookieCollection();

  

            //init for demo login

            gotCookieBaiduid =false;

            extractTokenValueOK =false;

            loginBaiduOk =false;

        }

  

        /******************************************************************************

        functions in crifanLib.cs

        Online browser:http://code.google.com/p/crifanlib/source/browse/trunk/csharp/crifanLib.cs

        Download:      http://code.google.com/p/crifanlib/

        *******************************************************************************/

  

        //quote the input dict values

        //note: the return result for first para no '&'

        publicstring quoteParas(Dictionary<string,string> paras)

        {

            stringquotedParas = "";

            boolisFirst = true;

            stringval = "";

            foreach(string para in paras.Keys)

            {

                if(paras.TryGetValue(para, outval))

                {

                    if(isFirst)

                    {

                        isFirst =false;

                        quotedParas += para +"=" + HttpUtility.UrlPathEncode(val);

                    }

                    else

                    {

                        quotedParas +="&" + para +"=" + HttpUtility.UrlPathEncode(val);

                    }

                }

                else

                {

                    break;

                }

            }

  

            returnquotedParas;

        }

  

  

        /*********************************************************************/

        /* cookie */

        /*********************************************************************/

  

        //add a single cookie to cookies, if already exist, update its value

        publicvoid addCookieToCookies(Cookie toAdd,ref CookieCollection cookies,bool overwriteDomain)

        {

            boolfound = false;

  

            if(cookies.Count > 0)

            {

                foreach(Cookie originalCookie incookies)

                {

                    if(originalCookie.Name == toAdd.Name)

                    {

                        // !!! for different domain, cookie is not same,

                        // so should not set the cookie value here while their domains is not same

                        // only if it explictly need overwrite domain

                        if((originalCookie.Domain == toAdd.Domain) ||

                            ((originalCookie.Domain != toAdd.Domain) && overwriteDomain))

                        {

                            //here can not force convert CookieCollection to HttpCookieCollection,

                            //then use .remove to remove this cookie then add

                            // so no good way to copy all field value

                            originalCookie.Value = toAdd.Value;

  

                            originalCookie.Domain = toAdd.Domain;

  

                            originalCookie.Expires = toAdd.Expires;

                            originalCookie.Version = toAdd.Version;

                            originalCookie.Path = toAdd.Path;

  

                            //following fields seems should not change

                            //originalCookie.HttpOnly = toAdd.HttpOnly;

                            //originalCookie.Secure = toAdd.Secure;

  

                            found =true;

                            break;

                        }

                    }

                }

            }

  

            if(!found)

            {

                if(toAdd.Domain != "")

                {

                    // if add the null domain, will lead to follow req.CookieContainer.Add(cookies) failed !!!

                    cookies.Add(toAdd);

                }

            }

  

        }//addCookieToCookies

  

        //add singel cookie to cookies, default no overwrite domain

        publicvoid addCookieToCookies(Cookie toAdd,ref CookieCollection cookies)

        {

            addCookieToCookies(toAdd,ref cookies,false);

        }

  

        //check whether the cookies contains the ckToCheck cookie

        //support:

        //ckTocheck is Cookie/string

        //cookies is Cookie/string/CookieCollection/string[]

        publicbool isContainCookie(objectckToCheck, objectcookies)

        {

            boolisContain = false;

  

            if((ckToCheck != null) && (cookies !=null))

            {

                stringckName = "";

                Type type = ckToCheck.GetType();

  

                //string typeStr = ckType.ToString();

  

                //if (ckType.FullName == "System.string")

                if(type.Name.ToLower() == "string")

                {

                    ckName = (string)ckToCheck;

                }

                elseif (type.Name == "Cookie")

                {

                    ckName = ((Cookie)ckToCheck).Name;

                }

  

                if(ckName != "")

                {

                    type = cookies.GetType();

  

                    // is single Cookie

                    if(type.Name == "Cookie")

                    {

                        if(ckName == ((Cookie)cookies).Name)

                        {

                            isContain =true;

                        }

                    }

                    // is CookieCollection

                    elseif (type.Name == "CookieCollection")

                    {

                        foreach(Cookie ck in(CookieCollection)cookies)

                        {

                            if(ckName == ck.Name)

                            {

                                isContain =true;

                                break;

                            }

                        }

                    }

                    // is single cookie name string

                    elseif (type.Name.ToLower() =="string")

                    {

                        if(ckName == (string)cookies)

                        {

                            isContain =true;

                        }

                    }

                    // is cookie name string[]

                    elseif (type.Name.ToLower() =="string[]")

                    {

                        foreach(string name in ((string[])cookies))

                        {

                            if(ckName == name)

                            {

                                isContain =true;

                                break;

                            }

                        }

                    }

                }

            }

  

            returnisContain;

        }//isContainCookie

  

        // update cookiesToUpdate to localCookies

        // if omitUpdateCookies designated, then omit cookies of omitUpdateCookies in cookiesToUpdate

        publicvoid updateLocalCookies(CookieCollection cookiesToUpdate,ref CookieCollection localCookies,object omitUpdateCookies)

        {

            if(cookiesToUpdate.Count > 0)

            {

                if(localCookies == null)

                {

                    localCookies = cookiesToUpdate;

                }

                else

                {

                    foreach(Cookie newCookie incookiesToUpdate)

                    {

                        if(isContainCookie(newCookie, omitUpdateCookies))

                        {

                            // need omit process this

                        }

                        else

                        {

                            addCookieToCookies(newCookie,ref localCookies);

                        }

                    }

                }

            }

        }//updateLocalCookies

          

        //update cookiesToUpdate to localCookies

        publicvoid updateLocalCookies(CookieCollection cookiesToUpdate,ref CookieCollection localCookies)

        {

            updateLocalCookies(cookiesToUpdate,ref localCookies,null);

        }

  

        /*********************************************************************/

        /* HTTP */

        /*********************************************************************/

  

        /* get url's response */

        publicHttpWebResponse getUrlResponse(stringurl,

                                        Dictionary<string,string> headerDict,

                                        Dictionary<string,string> postDict,

                                        inttimeout,

                                        stringpostDataStr)

        {

            //CookieCollection parsedCookies;

  

            HttpWebResponse resp =null;

  

            HttpWebRequest req = (HttpWebRequest)WebRequest.Create(url);

  

            req.AllowAutoRedirect =true;

            req.Accept ="*/*";

  

            //const string gAcceptLanguage = "en-US"; // zh-CN/en-US

            //req.Headers["Accept-Language"] = gAcceptLanguage;

  

            req.KeepAlive =true;

  

            //IE8

            //const string gUserAgent = "Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.1; WOW64; Trident/4.0; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; Media Center PC 6.0; InfoPath.3; .NET4.0C; .NET4.0E";

            //IE9

            //const string gUserAgent = "Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; WOW64; Trident/5.0)"; // x64

            conststring gUserAgent ="Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; Trident/5.0)";// x86

            //Chrome

            //const string gUserAgent = "Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US) AppleWebKit/533.4 (KHTML, like Gecko) Chrome/5.0.375.99 Safari/533.4";

            //Mozilla Firefox

            //const string gUserAgent = "Mozilla/5.0 (Windows; U; Windows NT 6.1; rv:1.9.2.6) Gecko/20100625 Firefox/3.6.6";

            req.UserAgent = gUserAgent;

  

            req.Headers["Accept-Encoding"] ="gzip, deflate";

            req.AutomaticDecompression = DecompressionMethods.GZip;

  

            req.Proxy =null;

  

            if(timeout > 0)

            {

                req.Timeout = timeout;

            }

  

            if(curCookies != null)

            {

                req.CookieContainer =new CookieContainer();

                req.CookieContainer.PerDomainCapacity = 40;// following will exceed max default 20 cookie per domain

                req.CookieContainer.Add(curCookies);

            }

  

            if(headerDict != null)

            {

                foreach(string header in headerDict.Keys)

                {

                    stringheaderValue = "";

                    if(headerDict.TryGetValue(header, outheaderValue))

                    {

                        // following are allow the caller overwrite the default header setting

                        if(header.ToLower() == "referer")

                        {

                            req.Referer = headerValue;

                        }

                        elseif (header.ToLower() =="allowautoredirect")

                        {

                            boolisAllow = false;

                            if(bool.TryParse(headerValue,out isAllow))

                            {

                                req.AllowAutoRedirect = isAllow;

                            }

                        }

                        elseif (header.ToLower() =="accept")

                        {

                            req.Accept = headerValue;

                        }

                        elseif (header.ToLower() =="keepalive")

                        {

                            boolisKeepAlive = false;

                            if(bool.TryParse(headerValue,out isKeepAlive))

                            {

                                req.KeepAlive = isKeepAlive;

                            }

                        }

                        elseif (header.ToLower() =="accept-language")

                        {

                            req.Headers["Accept-Language"] = headerValue;

                        }

                        elseif (header.ToLower() =="useragent")

                        {

                            req.UserAgent = headerValue;

                        }

                        else

                        {

                            req.Headers[header] = headerValue;

                        }

                    }

                    else

                    {

                        break;

                    }

                }

            }

  

            if(postDict != null|| postDataStr != "")

            {

                req.Method ="POST";

                req.ContentType ="application/x-www-form-urlencoded";

  

                if(postDict != null)

                {

                    postDataStr = quoteParas(postDict);

                }

  

                //byte[] postBytes = Encoding.GetEncoding("utf-8").GetBytes(postData);

                byte[] postBytes = Encoding.UTF8.GetBytes(postDataStr);

                req.ContentLength = postBytes.Length;

  

                Stream postDataStream = req.GetRequestStream();

                postDataStream.Write(postBytes, 0, postBytes.Length);

                postDataStream.Close();

            }

            else

            {

                req.Method ="GET";

            }

  

            //may timeout, has fixed in:

            //http://www.crifan.com/fixed_problem_sometime_httpwebrequest_getresponse_timeout/

            resp = (HttpWebResponse)req.GetResponse();

  

            updateLocalCookies(resp.Cookies,ref curCookies);

  

            returnresp;

        }

  

        publicHttpWebResponse getUrlResponse(stringurl,

                                    Dictionary<string,string> headerDict,

                                    Dictionary<string,string> postDict)

        {

            returngetUrlResponse(url, headerDict, postDict, 0, "");

        }

  

        publicHttpWebResponse getUrlResponse(stringurl)

        {

            returngetUrlResponse(url, null,null, 0, "");

        }

  

        // valid charset:"GB18030"/"UTF-8", invliad:"UTF8"

        publicstring getUrlRespHtml(stringurl,

                                        Dictionary<string,string> headerDict,

                                        stringcharset,

                                        Dictionary<string,string> postDict,

                                        inttimeout,

                                        stringpostDataStr)

        {

            stringrespHtml = "";

  

            //HttpWebResponse resp = getUrlResponse(url, headerDict, postDict, timeout);

            HttpWebResponse resp = getUrlResponse(url, headerDict, postDict, timeout, postDataStr);

  

            //long realRespLen = resp.ContentLength;

  

            StreamReader sr;

            if((charset != null) && (charset !=""))

            {

                Encoding htmlEncoding = Encoding.GetEncoding(charset);

                sr =new StreamReader(resp.GetResponseStream(), htmlEncoding);

            }

            else

            {

                sr =new StreamReader(resp.GetResponseStream());

            }

            respHtml = sr.ReadToEnd();

  

            returnrespHtml;

        }

  

        publicstring getUrlRespHtml(stringurl, Dictionary<string,string> headerDict,string charset, Dictionary<string,string> postDict,string postDataStr)

        {

            returngetUrlRespHtml(url, headerDict, charset, postDict, 0, postDataStr);

        }

  

        publicstring getUrlRespHtml(stringurl, Dictionary<string,string> headerDict, Dictionary<string,string> postDict)

        {

            returngetUrlRespHtml(url, headerDict, "", postDict,"");

        }

  

        publicstring getUrlRespHtml(stringurl, Dictionary<string,string> headerDict)

        {

            returngetUrlRespHtml(url, headerDict, null);

        }

  

        publicstring getUrlRespHtml(stringurl, stringcharset, inttimeout)

        {

            returngetUrlRespHtml(url, null, charset,null, timeout,"");

        }

  

        publicstring getUrlRespHtml(stringurl, stringcharset)

        {

            returngetUrlRespHtml(url, charset, 0);

        }

  

        publicstring getUrlRespHtml(stringurl)

        {

            returngetUrlRespHtml(url, "");

        }

  

  

        /******************************************************************************

        Demo emulate login baidu related functions

        *******************************************************************************/

  

        privatevoid btnGetBaiduid_Click(objectsender, EventArgs e)

        {

            //http://www.baidu.com/

            stringbaiduMainUrl = txbBaiduMainUrl.Text;

            HttpWebResponse resp = getUrlResponse(baiduMainUrl);

            txbGotBaiduid.Text ="";

            foreach(Cookie ck inresp.Cookies)

            {

                txbGotBaiduid.Text +="[" + ck.Name +"]=" + ck.Value;

                if(ck.Name == "BAIDUID")

                {

                    gotCookieBaiduid =true;

                }

            }

  

            if(gotCookieBaiduid)

            {

                //store cookies

                curCookies = resp.Cookies;

            }

            else

            {

                MessageBox.Show("错误：没有找到cookie BAIDUID ！");

            }

        }

  

        privatevoid btnGetToken_Click(objectsender, EventArgs e)

        {

            if(gotCookieBaiduid)

            {

                stringgetapiUrl = "https://passport.baidu.com/v2/api/?getapi&class=login&tpl=mn&tangram=true";

                stringrespHtml = getUrlRespHtml(getapiUrl);

  

                //bdPass.api.params.login_token='5ab690978812b0e7fbbe1bfc267b90b3';

                stringtokenValP = @"bdPass\.api\.params\.login_token='(?<tokenVal>\w+)';";

                Match foundTokenVal = (newRegex(tokenValP)).Match(respHtml);

                if(foundTokenVal.Success)

                {

                    //extracted the token value

                    txbExtractedTokenVal.Text = foundTokenVal.Groups["tokenVal"].Value;

                    extractTokenValueOK =true;

                }

                else

                {

                    txbExtractedTokenVal.Text ="错误：没有找到token的值！";

                }

  

            }

            else

            {

                MessageBox.Show("错误：之前没有正确获得Cookie：BAIDUID ！");

            }

        }

  

        privatevoid btnEmulateLoginBaidu_Click(objectsender, EventArgs e)

        {

            if(gotCookieBaiduid && extractTokenValueOK)

            {

                stringstaticpage = "http://www.baidu.com/cache/user/html/jump.html";

                  

                //init post dict info

                Dictionary<string,string> postDict =new Dictionary<string,string>();

                //postDict.Add("ppui_logintime", "");

                postDict.Add("charset","utf-8");

                //postDict.Add("codestring", "");

                postDict.Add("token", txbExtractedTokenVal.Text);

                postDict.Add("isPhone","false");

                postDict.Add("index","0");

                //postDict.Add("u", "");

                //postDict.Add("safeflg", "0");

                postDict.Add("staticpage", staticpage);

                postDict.Add("loginType","1");

                postDict.Add("tpl","mn");

                postDict.Add("callback","parent.bdPass.api.login._postCallback");

                postDict.Add("username", txbBaiduUsername.Text);

                postDict.Add("password", txbBaiduPassword.Text);

                //postDict.Add("verifycode", "");

                postDict.Add("mem_pass","on");

  

                stringbaiduMainLoginUrl = "https://passport.baidu.com/v2/api/?login";

                stringloginBaiduRespHtml = getUrlRespHtml(baiduMainLoginUrl,null, postDict);

  

                //check whether got all expected cookies

                Dictionary<string,bool> cookieCheckDict =new Dictionary<string,bool>();

                string[] cookiesNameList = {"BDUSS","PTOKEN", "STOKEN", "SAVEUSERID"};

                foreach(String cookieToCheck incookiesNameList)

                {

                    cookieCheckDict.Add(cookieToCheck,false);

                }

  

                foreach(Cookie singleCookie incurCookies)

                {

                    if(cookieCheckDict.ContainsKey(singleCookie.Name))

                    {

                        cookieCheckDict[singleCookie.Name] =true;

                    }

                }

  

                boolallCookiesFound = true;

                foreach(bool foundCurCookie in cookieCheckDict.Values)

                {

                    allCookiesFound = allCookiesFound && foundCurCookie;

                }

  

  

                loginBaiduOk = allCookiesFound;

                if(loginBaiduOk)

                {

                    txbEmulateLoginResult.Text ="成功模拟登陆百度首页！";

                }

                else

                {

                    txbEmulateLoginResult.Text ="模拟登陆百度首页 失败！";

                    txbEmulateLoginResult.Text += Environment.NewLine +"所返回的HTML源码为：";

                    txbEmulateLoginResult.Text += Environment.NewLine + loginBaiduRespHtml;

                }

            }

            else

            {

                MessageBox.Show("错误：没有正确获得Cookie BAIDUID 和/或 没有正确提取出token值！");

            }

        }

  

        privatevoid lklEmulateLoginTutorialUrl_LinkClicked(objectsender, LinkLabelLinkClickedEventArgs e)

        {

            stringemulateLoginTutorialUrl = "http://www.crifan.com/emulate_login_website_using_csharp";

            System.Diagnostics.Process.Start(emulateLoginTutorialUrl);

        }

  

        privatevoid btnClearAll_Click(objectsender, EventArgs e)

        {

            curCookies =new CookieCollection();

            gotCookieBaiduid =false;

            extractTokenValueOK =false;

            loginBaiduOk =false;

  

            txbGotBaiduid.Text ="";

            txbExtractedTokenVal.Text ="";

  

            txbBaiduUsername.Text ="";

            txbBaiduPassword.Text ="";

            txbEmulateLoginResult.Text ="";

        }

  

    }

}

完整的VS2010的项目，可去这里下载：

emulateLoginBaidu_csharp_crifanLibVersion_2012-11-07.7z

关于crifanLib.cs：

在线浏览：crifanLib.cs

下载：crifanLib_2012-11-07.7z

【总结】

可以看出，虽然之前分析出来的，模拟登陆百度首页的流程，相对不是那么复杂，但是实际上用C#实现起来，要比用Python实现出来，要复杂的多。

主要原因在于，Python中封装了很多常用的，好用的库函数。而C#中，很多细节，都需要自己处理，包括GET或POST时的各种参数，都要考虑到，另外尤其是涉及cookie等方面的内容，很是繁琐。

所以，对于抓取网页分析内容，和模拟登陆网站来说，还是Python用起来比较方便。

---

【后记 2013-09-11】

1.经过研究：

【记录】研究模拟登陆百度的C#代码为何在.NET 4.0中不工作

的确是：

之前的代码， 在.NET 3.5之前，都是正常工作的，而在.NET 4.0中，是不工作的；

2.现已找到原因并修复。

原因是：

.NET 4.0，对于没有指定expires域的cookie，会把cookie的expires域值设置成默认的0001年0分0秒，由此导致该cookie过期失效，导致百度的那个cookie：

H_PS_PSSID

失效，导致后续操作都异常了。

而.NET 3.5之前，虽然cookie的expires域值也是默认的0001年0分0秒，但是实际上cookie还是可用的，所以后续就正常，就不会发生此问题；

3.修复后的代码：

供下载：

（1）模拟百度登陆 独立完整代码版本 .NET 4.0

emulateLoginBaidu_csharp_independentCodeVersion_2013-09-11.7z

 

（2）模拟百度登陆 （利用我自己的）crifanLib版本 .NET 4.0

emulateLoginBaidu_csharp_crifanLibVersion_2013-09-11.7z

 

（抽空再上传上面两个文件，因为此处上传出错：

xxx.7z:

unknown Bytes complete FAILED!

:Upload canceled

: VIRUS DETECTED!

(Heuristics.Broken.Executable FOUND)

抽空换个时间上传试试。还是同样错误的话，再去解决。）

 

【总结】

.NET 不论是3.5以及之前，还是最新的4.0，在解析http的response中的Set-Cookie变成CookieCollection方面：

一直就是狗屎，bug一堆。

详见：

SetCookie解析有bug

以后，能少用那个resp.Cookies，就少用吧。

否则被C#玩死，都不知道怎么死的。

还是用自己写的那个解析函数去解析Set-Cookie，得到正确的CookieCollection吧。

详见：

解析（Http访问所返回的）Set-Cookie的字符串为Cookie数组:parseSetCookie