webBrowser获取验证码内存图片到picturebox中

转自:http://blog.csdn.net/wwm402654282/article/details/6209653

在COM 页上， 选择 Microsoft HTML Object Library ,添加mshtml 的引用。

使用命名空间 using mshtml。

核心代码：

 //页面有框架
 HTMLDocument html = (HTMLDocument)this.webBrowser1.Document.Window.Frames["login_iframe"].Document.DomDocument;
             HTMLDocument doc = (HTMLDocument)webBrowser1.Document.DomDocument;
             HTMLBody body = (HTMLBody)doc.body;
             IHTMLControlElement img = (IHTMLControlElement)webBrowser1.Document.Window.Frames["login_iframe"].Document.Images["imgVerify"].DomElement;
             IHTMLControlRange range = (IHTMLControlRange)((HTMLBody)html.body).createControlRange();
             range.add(img);
             range.execCommand("Copy", false, null);
             img = null;
             range = null;
             html = null;

             if (Clipboard.ContainsImage())
             {
                 this.pictureBox1.Image = Clipboard.GetImage();
             }
             else
             {
                 MessageBox.Show("执行不成功");
             }

             Clipboard.Clear();