网页照相机代码及分析

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;
}