HttpWebRequest提交数据的问题；

Question

这几天想学着做一个自动投票的工具；
代码如下：void vote(string key,int userid,string pass)
        {
            string url = WebSite + voteSite;
            string  param = "key="+key+"&id="+userid.ToString()+"&pass="+pass;
            //byte[] postdata = Encoding.ASCII.GetBytes(param);            //Encoding myEncoding = Encoding.GetEncoding("gb2312");
            string address = url + param;
            HttpWebRequest req = (HttpWebRequest)HttpWebRequest.Create(address);
            req.ContentType = "application/x-www-form-urlencoded";
            req.UserAgent = "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; GoogleT5; .NET CLR 2.0.50727)";
            req.Referer = site;
            //req.ContentLength = postdata.Length;
            req.Method = "POST";
            try
            {
                using (Stream reqStream = req.GetRequestStream())
                {
                    //reqStream.Write(postdata, 0, postdata.Length);
                    reqStream.Close();
                }
            }
            catch (WebException e)
            {
                MessageBox.Show(e.Message);
            }
        }--------------------------------------------------------------------------
死也提交不进去；测试页面为:http://bb.beingmate.com/photo/detail-14910.html
上面的测试规则为一个面页一个小时只能投一次票；通过页面正常的提交所产生的Header信息为(用Fiddler)：如下：
POST /vote_.asp?key=b594&id=14910&pass=2723 HTTP/1.1
Accept: */*
Accept-Language: zh-cn
Referer: http://bb.beingmate.com/photo/detail-14910.html
Accept-Encoding: gzip, deflate
User-Agent: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; GoogleT5; .NET CLR 2.0.50727)
Host: bb.beingmate.com
Content-Length: 0
Proxy-Connection: Keep-Alive
Pragma: no-cache
Cookie: cnzz_a887707=28; rtime=0; ltime=1218008354359; cnzz_eid=60832741-; 14929=1; ASPSESSIONIDSARSCBTQ=EALHPNAAEKOFHMKDMFGFHIDH
-------------------------------------
POST /vote_.asp?key=b594&id=14910&pass=2723 HTTP/1.1,其中key,id和pass值在模仿的时候没有错；
key：表示自身一个随机值；id:表示投票对象的id；pass表示验证码；我上面所使用的代码有什么问题吗？
我将
HttpWebRequest req = (HttpWebRequest)HttpWebRequest.Create(address);
改为:HttpWebRequest req = (HttpWebRequest)HttpWebRequest.Create(url);
然后在流里写入表单的值(postdata)?
但通过正常方式在Fiddler里面看，key=b594&id=14910&pass=2723 的值不是以表单的形式提交上去的，而是出现在QueryString里面。在Body里面根本就没有数据。
我做成了将需要提交的数据放在reqStream.Write(postdata, 0, postdata.Length)里加入，但提交不上去；但是提交评论是可以通过的（将提交内容话reqStream中提交可以成功）；唯独提交投票不能通过；我的问题出在哪里呢？
真是好恼人。三天了，一直找不到问题所在；望高手帮忙！

Answer 1

en!是的。如果机器重新启一次，或者IP地址发生变化的情况下：key的值才会发生变化；一般情况下不会改变的；
可以将这个页面[http://bb.beingmate.com/photo/detail-14910.html]用webclient.downloaddata下载来来，在数据中可以找到key的值;一般情况下不会发生改变；

Answer 2

你没有带SESSION POST,当然有问题了,他的验证码要通过Cookie: cnzz_a887707=28; rtime=0; ltime=1218008354359; cnzz_eid=60832741-; 14929=1; ASPSESSIONIDSARSCBTQ=EALHPNAAEKOFHMKDMFGFHIDH 
去和POST /vote_.asp?key=b594&id=14910&pass=2723 HTTP/1.1 中的2723去验证的.

Answer 3

这样吗？
----
void vote(string key,int userid,string pass)
        {
            string url = WebSite + voteSite;
            string  param = "key="+key+"&id="+userid.ToString()+"&pass="+pass;
            //byte[] postdata = Encoding.ASCII.GetBytes(param);            //Encoding myEncoding = Encoding.GetEncoding("gb2312");
            string address = url + param;
            HttpWebRequest req = (HttpWebRequest)HttpWebRequest.Create(address);
            wr.CookieContainer = myCookieContainer;
            req.ContentType = "application/x-www-form-urlencoded";
            req.UserAgent = "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; GoogleT5; .NET CLR 2.0.50727)";
            req.Referer = site;
            //req.ContentLength = postdata.Length;
            req.Method = "POST";
            try
            {                using (Stream reqStream = req.GetRequestStream())
                {
                    //reqStream.Write(postdata, 0, postdata.Length);
                    reqStream.Close();
                }
            }
            catch (WebException e)
            {
                MessageBox.Show(e.Message);
            }
            using (HttpWebResponse wr = req.GetResponse())
            {
                wr.Cookies = myCookieContainer.GetCookies(wr.RequestUri);
            } 
}-------------------------------------------------------------
但这里的Cookie在提交的时候只是 ASPSESSIONIDSARSCBTQ=EALHPNAAEKOFHMKDMFGFHIDH 
而没有cnzz_a887707=28; rtime=0; ltime=1218008354359; cnzz_eid=60832741-; 14929=1; 
这是为什么？

Answer 4

HttpWebRequest有个类似cookie的属性

Answer 5

查查里面的属性cookiecontainer
http://msdn.microsoft.com/en-us/library/system.net.httpwebrequest_properties.aspx

Answer 6

lz为什么将编码注释掉？
 //byte[] postdata = Encoding.ASCII.GetBytes(param);
//Encoding myEncoding = Encoding.GetEncoding("gb2312");
你是不是从网上看的这段代码然后copy下来一运行
//req.ContentLength = postdata.Length;
这句话就报错？所以你就注释掉。
记住C#的默认编码是UTF-8，你不进行编码是会出错的。
前段时间搞过httpwebrequest,
给你看看我测试通过的例子：
  HttpWebRequest req = (HttpWebRequest)WebRequest.Create(url);   //根据登录页面创建请求 
                req.Method = "POST";   //一定要是大写
                req.ContentType = "application/x-www-form-urlencoded";
                req.AllowAutoRedirect = false;
                cookieCon = new CookieContainer();
                req.CookieContainer = cookieCon;   //创建存储登录后的对象的CookieContainer  ，内容主要包括sessionID 和 form验证的cookie                 StringBuilder UrlEncoded = new StringBuilder();
                Char[] reserved =   { '?', '=', '&' };
                byte[] SomeBytes = null;                if (paramList != null)     //根据传入的数据进行Post
                {
                    int i = 0, j;
                    while (i < paramList.Length)
                    {
                        j = paramList.IndexOfAny(reserved, i);
                        if (j == -1)
                        {
                            UrlEncoded.Append(HttpUtility.UrlEncode(paramList.Substring(i, paramList.Length - i)));
                            break;
                        }
                        UrlEncoded.Append(HttpUtility.UrlEncode(paramList.Substring(i, j - i)));
                        UrlEncoded.Append(paramList.Substring(j, 1));
                        i = j + 1;
                    }
                    SomeBytes = Encoding.UTF8.GetBytes(UrlEncoded.ToString());
                    req.ContentLength = SomeBytes.Length;
                    Stream newStream = req.GetRequestStream();
                    newStream.Write(SomeBytes, 0, SomeBytes.Length);
                    newStream.Close();

Answer 7

Stream newStream=myRequest.GetRequestStream();
            // Send the data.
            newStream.Write(data,0,data.Length);

Answer 8

首先,打开页面http://bb.beingmate.com/photo/detail-14910.html 
得到cookie和 页面的html ,然后立刻通过cookie到http://bb.beingmate.com/getcode.asp中读取验证码
通过html中有一个onclick=\"vote('14910','xxxx')之类的字样,得到投票的key
代码如下:
 private string GetHTMLstring(string url)
        {
            HttpWebRequest httpWebRequest;
            HttpWebResponse webResponse;
            Stream stream;
            byte[] byteRequest ={ };            httpWebRequest = (HttpWebRequest)HttpWebRequest.Create(url);  //加载URL
            httpWebRequest.ContentType = "application/x-www-form-urlencoded";
            httpWebRequest.Method = "Post";
            httpWebRequest.ContentLength = byteRequest.Length;  //设置Header            stream = httpWebRequest.GetRequestStream();
            stream.Write(byteRequest, 0, byteRequest.Length); //POST信息
            stream.Close();            webResponse = (HttpWebResponse)httpWebRequest.GetResponse(); //收到应答
            StreamReader sr = new StreamReader(webResponse.GetResponseStream(), System.Text.Encoding.Default);            string c = webResponse.Headers.Get("Set-Cookie");
            cookie = c.Substring(0, c.IndexOf(";"));
            textBox1.Text = cookie;
            Image img = new Bitmap(GetYZMpicture("http://bb.beingmate.com/getcode.asp"));//获得验证码图片
            pictureBox1.Image = img;            return (sr.ReadToEnd());
        }        private Stream GetYZMpicture(string url)  //发送Cookie取得验证码
        {
            long contentLength;
            HttpWebRequest httpWebRequest;
            HttpWebResponse webResponse;
            Stream stream;
            byte[] byteRequest ={ };            httpWebRequest = (HttpWebRequest)HttpWebRequest.Create(url);  //加载URL
            CookieContainer cookie_container = new CookieContainer();     //加载Cookie
            cookie_container.SetCookies(new Uri(url), cookie);
            httpWebRequest.CookieContainer = cookie_container;            httpWebRequest.ContentType = "application/x-www-form-urlencoded";
            httpWebRequest.Accept = "image/gif, image/x-xbitmap, image/jpeg, image/pjpeg, application/x-shockwave-flash, application/vnd.ms-excel, application/vnd.ms-powerpoint, application/msword, */*";
            httpWebRequest.Method = "Post";
            httpWebRequest.ContentLength = byteRequest.Length;  //设置Header            stream = httpWebRequest.GetRequestStream();
            stream.Write(byteRequest, 0, byteRequest.Length); //POST信息
            stream.Close();            webResponse = (HttpWebResponse)httpWebRequest.GetResponse(); //收到应答
            stream = webResponse.GetResponseStream();
            contentLength = webResponse.ContentLength;            byte[] outBytes = new byte[contentLength]; //转换为Byte
            outBytes = ReadFully(stream);
            stream.Close();            return (new MemoryStream(outBytes));        }        public static byte[] ReadFully(Stream stream)
        {
            byte[] buffer = new byte[128];
            using (MemoryStream ms = new MemoryStream())
            {
                while (true)
                {
                    int read = stream.Read(buffer, 0, buffer.Length);
                    if (read <= 0)
                        return ms.ToArray();
                    ms.Write(buffer, 0, read);
                }
            }
        }        private void button4_Click(object sender, EventArgs e)
        {
            backstr=GetHTMLstring("http://bb.beingmate.com/photo/detail-14910.html");
            votestr = "http://bb.beingmate.com/vote_.asp?key=" + backstr.Substring(backstr.IndexOf("onclick=\"vote('14910'") + 23, 4) + "&id=14910&pass=";
        }其中textBox1为显示cookie的,pictureBox1.Image 为显示当前cookie所对应的验证码.
第二步,手工输入验证码,(自动的高手自己去做吧)到textBox6 (变量有些乱,上面的button4也是)点击一个按钮,模拟投票.
        private void button1_Click(object sender, EventArgs e)
        {
            votestr += textBox6.Text;
            GetVoteResult(votestr);
        }这时votestr为 /vote_.asp?key=b594&id=14910&pass=2723 的串public void GetVoteResult(string url)  //发送投票
        {
            HttpWebRequest httpWebRequest;
            HttpWebResponse webResponse;
            Stream stream;
            byte[] byteRequest = System.Text.Encoding.Default.GetBytes("");            httpWebRequest = (HttpWebRequest)HttpWebRequest.Create(url);  //加载URL
            CookieContainer cookie_container = new CookieContainer();     //加载Cookie
            cookie_container.SetCookies(new Uri(url), cookie);
            httpWebRequest.CookieContainer = cookie_container;            httpWebRequest.Method = "POST";
            httpWebRequest.ContentType = "application/x-www-form-urlencoded";
            httpWebRequest.ContentLength = byteRequest.Length;
            httpWebRequest.Accept = "image/gif, image/x-xbitmap, image/jpeg, image/pjpeg, application/vnd.ms-excel, application/vnd.ms-powerpoint, application/msword, application/x-silverlight, application/x-shockwave-flash, */*";
            httpWebRequest.Referer = "http://bb.beingmate.com/photo/detail-14910.html";
            httpWebRequest.UserAgent = "Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1; .NET CLR 2.0.50727)";            stream = httpWebRequest.GetRequestStream();
            stream.Write(byteRequest, 0, byteRequest.Length); //POST信息
            stream.Close();            webResponse = (HttpWebResponse)httpWebRequest.GetResponse();
            StreamReader sr = new StreamReader(webResponse.GetResponseStream(), System.Text.Encoding.Default);
            sr.Close();
            webResponse.Close();        }
通过代码将session和验证码等post出去.
这样,投票就成功了.
但是成功后没有返回的信息,只能通过打开IE查看投票数+1了,并且立刻投票说需要间隔1小时.所以应该是成功了.

Answer 9

那就用get
看那个网站是用什么方式网页处理的喽~自动投票页是在登录页???
要获取COOKIES在提交后就可以从RESPONSE流读取,保存在SESSION里也可,下回,就用HTTPWEBREQUEST的COOKIECONTAINER赋值为保存的SESSION,具体不知道那个网站的处理用户交互得到数据的机制.