asp.net C#實現根據網址抓取網頁截屏成圖片

 

代碼如下

複製代碼

using System.Drawing; using System.Drawing.Imaging; using System.IO; using System.Threading; using System.Windows.Forms; public class WebsiteToImage { private Bitmap m_Bitmap; private string m_Url; private string m_FileName = string.Empty; public WebsiteToImage(string url) { // Without file m_Url = url; } public WebsiteToImage(string url, string fileName) { // With file m_Url = url; m_FileName = fileName; } public Bitmap Generate() { // Thread var m_thread = new Thread(_Generate); m_thread.SetApartmentState(ApartmentState.STA); m_thread.Start(); m_thread.Join(); return m_Bitmap; } private void _Generate() { var browser = new WebBrowser { ScrollBarsEnabled = false }; browser.Navigate(m_Url); browser.DocumentCompleted += WebBrowser_DocumentCompleted; while (browser.ReadyState != WebBrowserReadyState.Complete) { Application.DoEvents(); } browser.Dispose(); } private void WebBrowser_DocumentCompleted(object sender, WebBrowserDocumentCompletedEventArgs e) { // Capture var browser = (WebBrowser)sender; browser.ClientSize = new Size(browser.Document.Body.ScrollRectangle.Width, browser.Document.Body.ScrollRectangle.Bottom); browser.ScrollBarsEnabled = false; m_Bitmap = new Bitmap(browser.Document.Body.ScrollRectangle.Width, browser.Document.Body.ScrollRectangle.Bottom); browser.BringToFront(); browser.DrawToBitmap(m_Bitmap, browser.Bounds); // Save as file? if (m_FileName.Length > 0) { // Save m_Bitmap.SaveJPG100(m_FileName); } } } public static class BitmapExtensions { public static void SaveJPG100(this Bitmap bmp, string filename) { var encoderParameters = new EncoderParameters(1); encoderParameters.Param[0] = new EncoderParameter(System.Drawing.Imaging.Encoder.Quality, 100L); bmp.Save(filename, GetEncoder(ImageFormat.Jpeg), encoderParameters); } public static void SaveJPG100(this Bitmap bmp, Stream stream) { var encoderParameters = new EncoderParameters(1); encoderParameters.Param[0] = new EncoderParameter(System.Drawing.Imaging.Encoder.Quality, 100L); bmp.Save(stream, GetEncoder(ImageFormat.Jpeg), encoderParameters); } public static ImageCodecInfo GetEncoder(ImageFormat format) { var codecs = ImageCodecInfo.GetImageDecoders(); foreach (var codec in codecs) { if (codec.FormatID == format.Guid) { return codec; } } // Return return null; } }

調用方式如下：

代碼如下	複製代碼
WebsiteToImage websiteToImage = new WebsiteToImage( http://www.111cn.net, @"D:Some Folderkeleyi.jpg"); websiteToImage.Generate();

這種方式使用了WebBrowser控制項，所以必須引用 System.Windows.Forms 命名空間