protected override void OnDownloadImageFinished(string imageUrl, int httpStatusCode, CefImage image)
            {
                System.Console.WriteLine("Entering OnDownloadImageFinished");

                int            width;
                int            height;
                CefBinaryValue cbv = image.GetAsPng(1, true, out width, out height);

                byte[] ba = cbv.ToArray();

                System.Console.WriteLine("Exiting OnDownloadImageFinished");
            }
        protected override void OnDownloadImageFinished(string imageUrl, int httpStatusCode, CefImage image)
        {
            int imageW, imageH;

            if (itemNumber >= 0)
            {
                if (image == null || image.Width == 0)
                {
                    MainForm.Instance.faTabStrip1.Items[itemNumber].ItemIcon         = Resources.blank;
                    MainForm.Instance.faTabStrip1.Items[itemNumber].BrowserIsLoading = false;
                    MainForm.Instance.faTabStrip1.Invalidate();
                }
                else
                {
                    try
                    {
                        if (((CefWebBrowser)(MainForm.Instance.faTabStrip1.Items[itemNumber].splic.Panel1.Controls[0])).Browser != null)//.Title.Contains("加载中...")!=true)
                        {
                            MainForm.Instance.faTabStrip1.Items[itemNumber].ItemIcon         = BytesToImage(image.GetAsPng(1f, true, out imageW, out imageH).ToArray());
                            MainForm.Instance.faTabStrip1.Items[itemNumber].BrowserIsLoading = false;
                            MainForm.Instance.faTabStrip1.Invalidate();
                        }
                        //}
                    }
                    catch
                    {
                        MainForm.Instance.faTabStrip1.Items[itemNumber].ItemIcon         = Resources.blank;
                        MainForm.Instance.faTabStrip1.Items[itemNumber].BrowserIsLoading = false;
                        MainForm.Instance.faTabStrip1.Invalidate();
                    }
                }
            }
            else if (itemNumber == -1) // 的时候,则为下载图片
            {
                WriteBytesToFile(filename, image.GetAsPng(1f, true, out imageW, out imageH).ToArray());
            }
            else if (itemNumber == -2)  //下载验证码
            {
                if (image == null)
                {
                    return;
                }
            }
        }