html网页转快照,C#实现HTML转图片-网页快照

一、实现方法

//WebSiteThumbnail.cs文件，在BS项目中需要添加对System.Windows.Forms的引用

using System;

using System.Data;

using System.Configuration;

using System.Web;

using System.Web.Security;

using System.Web.UI;

using System.Web.UI.WebControls;

using System.Web.UI.WebControls.WebParts;

using System.Web.UI.HtmlControls;

using System.Drawing;

using System.Threading;

using System.Windows.Forms;

namespace TestWebApp

{

public class WebSiteThumbnail

{

Bitmap m_Bitmap;

string m_Url;

int m_BrowserWidth, m_BrowserHeight, m_ThumbnailWidth, m_ThumbnailHeight;

public WebSiteThumbnail(string Url, int BrowserWidth, int BrowserHeight, int ThumbnailWidth, int ThumbnailHeight)

{

m_Url = Url;

m_BrowserHeight = BrowserHeight;

m_BrowserWidth = BrowserWidth;

m_ThumbnailWidth = ThumbnailWidth;

m_ThumbnailHeight = ThumbnailHeight;

}

public static Bitmap GetWebSiteThumbnail(string Url, int BrowserWidth, int BrowserHeight, int ThumbnailWidth, int ThumbnailHeight)

{

WebSiteThumbnail thumbnailGenerator = new WebSiteThumbnail(Url, BrowserWidth, BrowserHeight, ThumbnailWidth, ThumbnailHeight);

return thumbnailGenerator.GenerateWebSiteThumbnailImage();

}

public Bitmap GenerateWebSiteThumbnailImage()

{

Thread m_thread = new Thread(new ThreadStart(_GenerateWebSiteThumbnailImage));

m_thread.SetApartmentState(ApartmentState.STA);

m_thread.Start();

m_thread.Join();

return m_Bitmap;

}

private void _GenerateWebSiteThumbnailImage()

{

WebBrowser m_WebBrowser = new WebBrowser();

m_WebBrowser.ScrollBarsEnabled = false;

m_WebBrowser.Navigate(m_Url);

m_WebBrowser.DocumentCompleted += new WebBrowserDocumentCompletedEventHandler(WebBrowser_DocumentCompleted);

while (m_WebBrowser.ReadyState != WebBrowserReadyState.Complete)

Application.DoEvents();

m_WebBrowser.Dispose();

}

private void WebBrowser_DocumentCompleted(object sender, WebBrowserDocumentCompletedEventArgs e)

{

WebBrowser m_WebBrowser = (WebBrowser)sender;

m_WebBrowser.ClientSize = new Size(this.m_BrowserWidth, this.m_BrowserHeight);

m_WebBrowser.ScrollBarsEnabled = false;

m_Bitmap = new Bitmap(m_WebBrowser.Bounds.Width, m_WebBrowser.Bounds.Height);

m_WebBrowser.BringToFront();

m_WebBrowser.DrawToBitmap(m_Bitmap, m_WebBrowser.Bounds);

m_Bitmap = (Bitmap)m_Bitmap.GetThumbnailImage(m_ThumbnailWidth, m_ThumbnailHeight, null, IntPtr.Zero);

}

}

}

二、调用方法

//在任意网页中的Page_Load事件时，加入如下代码：

protected void Page_Load(object sender, EventArgs e)

{

Bitmap m_Bitmap = WebSiteThumbnail.GetWebSiteThumbnail("http://www.google.cn", 600, 600, 600, 600);             MemoryStream ms = new MemoryStream();             m_Bitmap.Save(ms, System.Drawing.Imaging.ImageFormat.Png);//JPG、GIF、PNG等均可             byte[] buff = ms.ToArray();             Response.BinaryWrite(buff);        }