网页照相机代码及分析

此代码出自CSDN
http://download.csdn.net/source/1383175
我对代码进行了一些简单的分析
如下：

        public Form1()

        {

            InitializeComponent();

            //先定义控件的DocumentCompleted事件，网页加载完毕

            //System.Windows.Forms.WebBrowser

            this.webBrowser1.DocumentCompleted += new WebBrowserDocumentCompletedEventHandler(webBrowser1_DocumentCompleted);

        }

        /// <summary>

        /// 委托事件，网页加载完就触发

        /// </summary>

        /// <param name="sender"></param>

        /// <param name="e"></param>

        void webBrowser1_DocumentCompleted(object sender, WebBrowserDocumentCompletedEventArgs e)

        {

            GetImage();

        }

        void GetImage()

        {

            if (webBrowser1.Document == null) return;

            try

            {

                //得到网页的高度

                int scrollHeight = webBrowser1.Document.Body.ScrollRectangle.Height;

                //得到网页的宽度

                int scrollWidth = webBrowser1.Document.Body.ScrollRectangle.Width;

                //重新设置控件的大小

                webBrowser1.Size = new Size(scrollWidth, scrollHeight);

                //创造一个空图片

                Bitmap bm = new Bitmap(scrollWidth, scrollHeight);

                //把控件画到这个图片中去

                webBrowser1.DrawToBitmap(bm, new Rectangle(0, 0, bm.Width, bm.Height));

                //制造一个文件名

                string saveAsName;

                saveAsName = Regex.Replace(txtURL.Text, @"(\\|\/|\:|\*|\?|\""|\<|\>|\|)?", "");

                //按这个文件名保存图片

                bm.Save(saveAsName + ".png", System.Drawing.Imaging.ImageFormat.Png);

                //释放这个图片

                bm.Dispose();

            }

            catch (Exception e)

            {

                MessageBox.Show(e.Message, "保存失败", MessageBoxButtons.OK, MessageBoxIcon.Error);

            }

            finally

            {

            }

            btnOK.Enabled = true;

        }

        private void buttonCapture_Click(object sender, EventArgs e)

        {

            //开始加载一个网页，加载完了就执行委托事件

            webBrowser1.Navigate(txtURL.Text);

            btnOK.Enabled = false;

        }

 

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