Question

我正在尝试在我的程序中登录Facebook并从那里解析一些信息（如姓名，个人资料照片等）。

每次执行下面的代码时，我都会被重定向回Facebook的主页面。

string email = "email";
string pw = "pw";
string PostData = String.Format("email={0}&pass={1}", email, pw);

CookieContainer cookieContainer = new CookieContainer();

HttpWebRequest req = (HttpWebRequest)HttpWebRequest.Create("");
req.CookieContainer = cookieContainer;
req.Method = "POST";
req.ContentLength = PostData.Length;
req.ContentType = "application/x-www-form-urlencoded";
req.AllowAutoRedirect = true;
req.UserAgent = "Mozilla/5.0 (Windows NT 6.1) AppleWebKit/535.2 (KHTML, like Gecko) Chrome/15.0.874.121 Safari/535.2";

ASCIIEncoding encoding = new ASCIIEncoding();
byte[] loginDataBytes = encoding.GetBytes(PostData);
req.ContentLength = loginDataBytes.Length;
Stream stream = req.GetRequestStream();
stream.Write(loginDataBytes, 0, loginDataBytes.Length);

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

Stream datastream = webResp.GetResponseStream();
StreamReader reader = new StreamReader(datastream);
webBrowser1.DocumentText = reader.ReadToEnd();

foreach (Cookie cookies in webResp.Cookies)
{
    MessageBox.Show(cookies.Name + "   " + cookies.Value);
}

我在这里做错了什么？任何帮助将不胜感激，非常感谢！：）

编辑：我发布后不久就发现了如何做到这一点。

Facebook每次访问时都会发送一个cookie，看你是否启用了cookie，我所做的是向Facebook的登录页面发送请求以获取cookie，然后发送另一个带有POST数据的cookie。它以这种方式工作，我成功登录。

非常感谢！：）

Answer 1

我很高兴你找到了答案，我也可以使用HttpWebRequest登录facebook，就像你说的那样..这是一个可接受的解决方法：

首先请求：获取Cookie。

 CookieCollection cookies = new CookieCollection();
 HttpWebRequest request = (HttpWebRequest)WebRequest.Create("https://www.facebook.com); 
 request.CookieContainer = new CookieContainer();
 request.CookieContainer.Add(cookies);
 //Get the response from the server and save the cookies from the first request..
 HttpWebResponse response = (HttpWebResponse)request.GetResponse();
 cookies = response.Cookies;

第二个请求：发布表单数据并从第一个请求中恢复Cookie ..

 string getUrl = "https://www.facebook.com/login.php?login_attempt=1";
 string postData = String.Format("email={0}&pass={1}", "value1", "value2");
 HttpWebRequest getRequest = (HttpWebRequest)WebRequest.Create(getUrl);
 getRequest.CookieContainer = new CookieContainer();
 getRequest.CookieContainer.Add(cookies); //recover cookies First request
 getRequest.Method = WebRequestMethods.Http.Post;
 getRequest.UserAgent = "Mozilla/5.0 (Windows NT 6.1) AppleWebKit/535.2 (KHTML, like Gecko) Chrome/15.0.874.121 Safari/535.2";
 getRequest.AllowWriteStreamBuffering = true;
 getRequest.ProtocolVersion = HttpVersion.Version11;
 getRequest.AllowAutoRedirect = true;
 getRequest.ContentType = "application/x-www-form-urlencoded";

 byte[] byteArray = Encoding.ASCII.GetBytes(postData);
 getRequest.ContentLength = byteArray.Length;   
 Stream newStream = getRequest.GetRequestStream(); //open connection
 newStream.Write(byteArray, 0, byteArray.Length); // Send the data.
 newStream.Close();

 HttpWebResponse getResponse = (HttpWebResponse)getRequest.GetResponse();
 using (StreamReader sr = new StreamReader(getResponse.GetResponseStream()))
 {
   string sourceCode = sr.ReadToEnd();               
 }

这是与HttpWebRequest一起使用的众多方法之一，如果您更喜欢使用WebBrowser，则使用以下方法可以接受：

webBrowser1.Navigate("https://www.facebook.com/login.php?login_attempt=1", "",byteArray, "Content-Type: application/x-www-form-urlencoded");

我刚刚意识到它与InternetSetCookie不兼容，原因可能是因为从Facebook返回的Cookie具有“HttpOnly”属性（true），并且客户无法访问它 - 边脚本。

Answer 2

有时使用网络浏览器更容易，您可以在后台运行隐藏的浏览器。稍后你可以获得内部html或者下载图像。无论你需要做什么。这是一个使用Windows窗体的示例。

创建一个新的win表单应用程序，添加一个按钮并将该代码粘贴到其中。不要添加它应该工作的任何其他东西......

private void button1_Click(object sender, EventArgs e)
{
    string email = "Your email";
    string password = "your password";

    // create a new browser
    WebBrowser w = new WebBrowser();
    w.Dock = DockStyle.Fill;
    this.Controls.Add(w); // you may add the controll to your windows forms if  you want to see what is going on
    // latter you may not chose to add the browser or you can even set it to invisible... 


    // navigate to facebook
    w.Navigate(@"http://www.facebook.com/");

    // wait a little
    for (int i = 0; i < 100; i++)
    {
        System.Threading.Thread.Sleep(10);
        System.Windows.Forms.Application.DoEvents();
    }


    HtmlElement temp=null;

    // while we find an element by id named email
    while (temp == null)
    {
        temp = w.Document.GetElementById("email");
        System.Threading.Thread.Sleep(10);
        System.Windows.Forms.Application.DoEvents();
    }

    // once we find it place the value
    temp.SetAttribute("value", email);


    temp = null;
    // wiat till element with id pass exists
    while (temp == null)
    {
        temp = w.Document.GetElementById("pass");
        System.Threading.Thread.Sleep(10);
        System.Windows.Forms.Application.DoEvents();
    }
    // once it exist set it value equal to passowrd
    temp.SetAttribute("value", password);

    // if you already found the last fields the button should also be there...

    var inputs = w.Document.GetElementsByTagName("input");

    int counter = 0;
    bool enableClick = false;

    // iterate through all the inputs in the document
    foreach (HtmlElement btn in inputs)
    {

        try
        {
            var att = btn.GetAttribute("tabindex");
            var name = btn.GetAttribute("id");

            if (enableClick)// button to submit always has a differnt id. it should be after password textbox
            {
                btn.InvokeMember("click");
                counter++;
            }

            if (name.ToUpper().Contains("PASS") || att=="4") 
            {
                enableClick = true;  // button should be next to the password input                    
            }

            // try a max of 5 times
            if (counter > 5)
                break;
        }
        catch
        {

        }
    }
}

Answer 3

webbrowser1.navigate("www.facebook.com");
webbrowser1.GetElementByiId("email").value="your mail ID";
webbrowser1.GetElementByiId("pass").value="password";
HtmlElement form = webBrowser1.Document.GetElementById("FormID");
if (form != null)
form.InvokeMember("submit");

C＃ - HttpWebRequest POST（登录Facebook）

3 个答案: