C#实现在网页中根据url截图并输出到网页的方法

本文实例讲述了c#实现在网页中根据url截图并输出到网页的方法。分享给大家供大家参考，具体如下：

网页截图是很多站点的一个小需求，这段代码实现的是如何根据url获得网页截图并输出到网页中。

using system;
using system.collections.generic;
using system.linq;
using system.web;
using system.web.ui;
using system.web.ui.webcontrols;
using system.threading;
using system.windows.forms;
using system.drawing;
using system.io;
/// <summary>
/// this page show the way of generate a image in website
/// </summary>
public partial class default2 : system.web.ui.page
{
  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);
  }
}
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);
  }
}

希望本文所述对大家c#程序设计有所帮助。