C# 带有Facebook验证码的HTTP帖子

我正在尝试用c#获取facebook验证码图像，然后将其显示在我的应用程序中，并将响应发送回facebook。我的应用程序运行良好，基本上可以与facebook进行通信，但过了一段时间，它会要求验证码。我加入了输入验证码的功能，当我使用webclient将其发送到facebook时，它只会在响应中感知另一个验证码。我与TemperData inn Firefox进行了双重检查，设置了正确的标题信息和所有字段，但仍然没有将我重定向到正确的页面。事实上，在响应头中，与数据相比，我可以看到缺少一个字段

    req = (HttpWebRequest)WebRequest.Create("https://www.facebook.com/recover/initiate");
        req.Host = "www.facebook.com";
        req.CookieContainer = cookies;
        req.Method = "GET";
        req.UserAgent = "Mozilla/5.0 (Windows NT 6.2; WOW64; rv:22.0) Gecko/20100101 Firefenter code hereox/22.0";
    req.KeepAlive = true;
    resp = req.GetResponse();
    streamReader = new StreamReader(resp.GetResponseStream());
    s = streamReader.ReadToEnd().Trim();

    index = s.IndexOf("https://www.facebook.com/captcha/tfbimage.php?");
    if (index == -1)
        continue;
    string uri = s.Substring(index);
    uri = uri.Substring(0, uri.IndexOf("\\\"") - 1);

    string captcha_persist_data = s.Substring(s.IndexOf("captcha_persist_data"));                    
    captcha_persist_data = captcha_persist_data.Substring(captcha_persist_data.IndexOf("value") + 7);
    captcha_persist_data = captcha_persist_data.Substring(0, 1156);

    string lsd = s.Substring(s.IndexOf("lsd"));
    lsd = lsd.Substring(lsd.IndexOf("value") + 7);
    lsd = lsd.Substring(0, 8);
    client = new WebClient();
    coo += "act=1375466977443%2F3;_e_0p4M_2=%5B%220p4M%22%2C1375466960620%2C%22act%22%2C1375466960619%2C2%2C%22captcha_response%22%2C%22click%22%2C%22click%22%2C%22-%22%2C%22r%22%2C%22%2Frecover%2Finitiate%22%2C%7B%22ft%22%3A%7B%7D%2C%22gt%22%3A%7B%7D%7D%2C0%2C0%2C0%2C1423%2C16%5D;wd=1920x796;_e_0p4M_3=%5B%220p4M%22%2C1375466977445%2C%22act%22%2C1375466977443%2C3%2C%22captcha_submit%22%2C%22click%22%2C%22click%22%2C%22-%22%2C%22r%22%2C%22%2Frecover%2Finitiate%22%2C%7B%22ft%22%3A%7B%7D%2C%22gt%22%3A%7B%7D%7D%2C0%2C0%2C0%2C1423%2C16%5D";

    client.Headers[HttpRequestHeader.Host] = "www.facebook.com";
    client.Headers[HttpRequestHeader.UserAgent] = "Mozilla/5.0 (Windows NT 6.2; WOW64; rv:22.0) Gecko/20100101 Firefox/22.0";
    client.Headers[HttpRequestHeader.Accept] = "text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8";
    client.Headers[HttpRequestHeader.AcceptLanguage] = "en-US,en;q=0.5";
    //client.Headers[HttpRequestHeader.AcceptEncoding] = "gzip, deflate";
    client.Headers[HttpRequestHeader.Referer]="https://www.facebook.com/recover/initiate";
    client.Headers[HttpRequestHeader.Cookie] = coo;
    //client.Headers[HttpRequestHeader.Connection] = "keep-alive";
    client.Headers[HttpRequestHeader.ContentType] = "application/x-www-form-urlencoded";
    //client.Headers[HttpRequestHeader.ContentLength] = "1235";

  image1.Source = new BitmapImage(new Uri(uri));
    MessageBox.Show("Alert");
    streamReader = new StreamReader("D:\\abc.txt");
    string newStr = streamReader.ReadLine();
    streamReader.Close();

    nameValuePairs = new NameValueCollection();
    nameValuePairs.Add("lsd", lsd);

    nameValuePairs.Add("captcha_persist_data", captcha_persist_data);

    nameValuePairs.Add("captcha_response", newStr);

    nameValuePairs.Add("captcha_submit", "Submit");

    response = client.UploadValues("https://www.facebook.com/recover/initiate", nameValuePairs);
    chars = new char[response.Length];
    for (int i = 0; i < response.Length; i++)
    {
        chars[i] = Convert.ToChar(response[i]);
    }
    s = new string(chars);

req=（HttpWebRequest）WebRequest.Create（“https://www.facebook.com/recover/initiate");
req.Host=“www.facebook.com”；
req.CookieContainer=cookies；
req.Method=“GET”；
req.UserAgent=“Mozilla/5.0（Windows NT 6.2；WOW64；rv:22.0）Gecko/20100101 Firefenter代码hereox/22.0”；
req.KeepAlive=true；
resp=req.GetResponse（）；
streamReader=新的streamReader（resp.GetResponseStream（））；
s=streamReader.ReadToEnd（）.Trim（）；
索引=s.IndexOf（“https://www.facebook.com/captcha/tfbimage.php?");
如果（索引==-1）
继续；
字符串uri=s.Substring（索引）；
uri=uri.Substring（0，uri.IndexOf（“\\\”）-1）；
字符串captcha_persist_data=s.Substring（s.IndexOf（“captcha_persist_data”）；
captcha\u persist\u data=captcha\u persist\u data.Substring（captcha\u persist\u data.IndexOf（“值”）+7）；
captcha_persist_data=captcha_persist_data.Substring（01156）；
字符串lsd=s.Substring（s.IndexOf（“lsd”）；
lsd=lsd.子字符串（lsd.IndexOf（“值”）+7）；
lsd=lsd.子串（0,8）；
客户端=新的WebClient（）；
coo+=“act=1375466977443%2F3_e_0p4; u 2=%5B%220p4M%22%2C1375466960620%2C%22act%22%2C1375466960619%2C2%2C%22captcha_响应%22%2C%22click%22%2C%22%2C%22%2C%22r%22%2C%22%2C%7B%22ft%22%3A%7B%7D%22gt%22%3A%7D%7D%2C0%2C0%2C1423%2C16%5D；wd=1920x796_e_0p4M_3=%5B%220p4M%22%2C1375466977445%2C%22act%22%2C1375466977443%2C3%2C%22captcha_提交%22%2C%22click%22%2C%22-%2C%22r%22%2C%22%2F恢复%2F启动%22%2C%7B%7D%22ft%22%3A%7D%22gt%22%3A%7B%7D%7D%2C0%2C0%2C0%2C16%5D”；
client.Headers[HttpRequestHeader.Host]=“www.facebook.com”；
client.Headers[HttpRequestHeader.UserAgent]=“Mozilla/5.0（Windows NT 6.2；WOW64；rv:22.0）Gecko/20100101 Firefox/22.0”；
client.Headers[HttpRequestHeader.Accept]=“text/html，application/xhtml+xml，application/xml；q=0.9，*/*；q=0.8”；
client.Headers[HttpRequestHeader.AcceptLanguage]=“en-US，en；q=0.5”；
//client.Headers[HttpRequestHeader.AcceptEncoding]=“gzip，deflate”；
client.Headers[HttpRequestHeader.Referer]=”https://www.facebook.com/recover/initiate";
client.Headers[HttpRequestHeader.Cookie]=coo；
//client.Headers[HttpRequestHeader.Connection]=“保持活动状态”；
client.Headers[HttpRequestHeader.ContentType]=“application/x-www-form-urlencoded”；
//client.Headers[HttpRequestHeader.ContentLength]=“1235”；
image 1.Source=新的位图图像（新的Uri（Uri））；
MessageBox.Show（“警报”）；
streamReader=新的streamReader（“D:\\abc.txt”）；
字符串newStr=streamReader.ReadLine（）；
streamReader.Close（）；
nameValuePairs=新的NameValueCollection（）；
nameValuePairs.Add（“lsd”，lsd）；
nameValuePairs.Add（“captcha\u persist\u data”，captcha\u persist\u data）；
nameValuePairs.Add（“验证码响应”，newStr）；
添加（“验证码提交”、“提交”）；
响应=客户端。上载值（“https://www.facebook.com/recover/initiate“，nameValuePairs）；
chars=新字符[response.Length]；
for（int i=0；i

---

任何帮助都将不胜感激。

您应该使用Facebook API。