在C＃中显示来自Webbrowser的验证码

Question

So I am trying to set up a tool that auto creates accounts but users need to complete captcha codes to verify they are human, I want to get what ever the captcha code image is and show it to the users, I know the elements ID but how would I get a component (or what component would I use) so it only shows that part of the webbroswer ?

My code...

webBrowser1.Document.GetElementById("recaptcha_challenge_image")

But after that I am not sure what I would do ? I tried something like...

webBrowser1.Document.GetElementById("recaptcha_challenge_image") = pictureBox1.BackgroundImage;

I am not quite sure what to do the site I am trying to get the captcha code from is https://account.sonyentertainmentnetwork.com/liquid/reg/account/create-account!input.action

Answer 1

Put your code in the DocumentCompleted event to make sure the document has loaded:

WebBrowser browser = new WebBrowser();
browser.DocumentCompleted += browser_DocumentCompleted;
browser.Navigate("https://account.sonyentertainmentnetwork.com/liquid/reg/account/create-account!input.action");

The DocumentCompleted event will fire several times, sometimes before the captcha has finished loading, so check for null before using it. The code for the event looks as follows:

void browser_DocumentCompleted(object sender, WebBrowserDocumentCompletedEventArgs e)
    {
        WebBrowser browser = (WebBrowser)sender;
        var item = browser.Document.GetElementById("recaptcha_challenge_image");
        if (item != null)
            pictureBox1.Load(item.GetAttribute("src"));
    }