C#下载验证码图片

最新推荐文章于 2019-07-08 13:27:28 发布

原创最新推荐文章于 2019-07-08 13:27:28 发布 · 857 阅读

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#c# #验证码

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本文介绍了如何在网页加载完成后，获取并下载验证码图片，并利用Web客户端进行下载操作，最终展示在图片框中，实现自动化处理流程。

<span style="font-size:18px;">//webBrowser.DocumentCompleted
            if (isLoad==1)
            {
                timer1.Enabled = false;

                string strHtmlsoure = GetHtmlSoure();

                string str = mid(strHtmlsoure, "/commbank\\", "\"");
                str = "" + str;

                WebClient w = new WebClient();
                WebClient webClient = new WebClient();
                string imgName;
                imgName = n++ + ".jpg";
                webClient.DownloadFile(str, "d:\\temp\\" + imgName);

                webBrowser.Navigate(Me.loginCarIdUrl);
                timer1.Enabled = true;
            }
            timer1.Enabled = false;</span>

mid()是获取中间字符

isload是否加载完

新方案：

HtmlElement ImgeTag = webBrowser.Document.All["img2"];
            Image numPic = Me.GetWebImage(webBrowser, ImgeTag); // 得到验证码图片
            pictureBox1.Image = numPic;

 public static Image GetWebImage(WebBrowser WebCtl, HtmlElement ImgeTag)
        {
            HTMLDocument doc = (HTMLDocument)WebCtl.Document.DomDocument;
            HTMLBody body = (HTMLBody)doc.body;
            IHTMLControlRange rang = (IHTMLControlRange)body.createControlRange();
            IHTMLControlElement Img = (IHTMLControlElement)ImgeTag.DomElement; //图片地址

            Image oldImage = Clipboard.GetImage();
            rang.add(Img);
            rang.execCommand("Copy", false, null);  //拷贝到内存
            Image numImage = Clipboard.GetImage();
            try
            {
                Clipboard.SetImage(oldImage);
            }
            catch
            {
            }

            return numImage;
        }