富贵资源网

ASP.NET实现根据URL生成网页缩略图的方法
站长资源 2024/11/18 佚名
70 1538
富贵资源网 Design By www.hznty.com

本文实例讲述了ASP.NET实现根据URL生成网页缩略图的方法。分享给大家供大家参考，具体如下：

工作中需要用到根据URL生成网页缩略图功能，提前做好准备。

在网上找了份源码，但是有错误:当前线程不在单线程单元中，因此无法实例化 ActiveX 控件“8856f961-340a-11d0-a9”，解决后运行良好，记录在此备用！

起始页：Default.aspx

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Default.aspx.cs" Inherits="CaptureToImage._Default" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head id="Head1" runat="server">
 <title>Snap</title>
</head>
<body>
 <form id="form1" runat="server">
 <div>
 <input type="button" onclick="window.open('Snap.aspx" value="生成网页缩略图"/>
 </div>
 </form>
</body>
</html>

调用页：Snap.aspx

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Snap.aspx.cs" Inherits="CaptureToImage.Snap" AspCompat="true" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
 <title>无标题页</title>
</head>
<body>
 <form id="form1" runat="server">
 <div>
 </div>
 </form>
</body>
</html>

PS：红色字体部分是为解决错误增加的代码，强制程序在单线程环境下运行！

调用页：Snap.aspx.cs

using System;
using System.Data;
using System.Configuration;
using System.Collections;
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.Imaging;
namespace CaptureToImage
{
 public partial class Snap : System.Web.UI.Page
 {
  protected void Page_Load(object sender, EventArgs e)
  {
   string url = string.Empty;
   url = Request.QueryString[0];
   try
   {
    GetImage thumb = new GetImage(url, 1024, 768, 800, 600);
    System.Drawing.Bitmap x = thumb.GetBitmap();
    x.Save(Response.OutputStream, ImageFormat.Jpeg);
    Response.ContentType = "image/jpeg";
   }
   catch (Exception ex)
   {
    Response.Write(ex.Message);
   }
  }
 }
}

类文件：GetImage.cs

using System;
using System.Drawing;
using System.Drawing.Imaging;
using System.Windows.Forms;
using System.Web.UI;
namespace CaptureToImage
{
 public class GetImage
 {
  int S_Height;
  int S_Width;
  int F_Height;
  int F_Width;
  string MyURL;
  public int ScreenHeight
  {
   get
   {
    return S_Height;
   }
   set
   {
    S_Height = value;
   }
  }
  public int ScreenWidth
  {
   get
   {
    return S_Width;
   }
   set
   {
    S_Width = value;
   }
  }
  public int ImageHeight
  {
   get
   {
    return F_Height;
   }
   set
   {
    F_Height = value;
   }
  }
  public int ImageWidth
  {
   get
   {
    return F_Width;
   }
   set
   {
    F_Width = value;
   }
  }
  public string WebSite
  {
   get
   {
    return MyURL;
   }
   set
   {
    MyURL = value;
   }
  }
  public GetImage(string WebSite, int ScreenWidth, int ScreenHeight, int ImageWidth, int ImageHeight)
  {
   this.WebSite = WebSite;
   this.ScreenHeight = ScreenHeight;
   this.ScreenWidth = ScreenWidth;
   this.ImageHeight = ImageHeight;
   this.ImageWidth = ImageWidth;
  }
  [STAThread]
  public Bitmap GetBitmap()
  {
   WebPageBitmap Shot = new WebPageBitmap(this.WebSite, this.ScreenWidth, this.ScreenHeight);
   Shot.GetIt();
   Bitmap Pic = Shot.DrawBitmap(this.ImageHeight, this.ImageWidth);
   return Pic;
  }
 }
 public class WebPageBitmap
 {
  WebBrowser MyBrowser;
  string URL;
  int Height;
  int Width;
  public WebPageBitmap(string url, int width, int height)
  {
   this.URL = url;
   this.Width = width;
   this.Height = height;
   MyBrowser = new WebBrowser();
   MyBrowser.ScrollBarsEnabled = false;
   MyBrowser.Size = new Size(this.Width, this.Height);
  }
  public void GetIt()
  {
   NavigateUrl(this.URL);
   while (MyBrowser.ReadyState != WebBrowserReadyState.Complete)
   {
    Application.DoEvents();
   }
  }
  public delegate void DelUserHandler(string url);
  public void NavigateUrl(string url)
  {
   try
   {
    if (this.MyBrowser.InvokeRequired)
    {
     DelUserHandler handler = new DelUserHandler(NavigateUrl);
     MyBrowser.Invoke(handler, url);
    }
    else
    {
     this.MyBrowser.Navigate(url);
    }
   }
   catch (Exception ex)
   {
    throw new Exception("NavigateUrl()" + ex.Message);
   }
  }
  public Bitmap DrawBitmap(int theight, int twidth)
  {
   Bitmap myBitmap = new Bitmap(this.Width, this.Height);
   Rectangle DrawRect = new Rectangle(0, 0, this.Width, this.Height);
   MyBrowser.DrawToBitmap(myBitmap, DrawRect);
   System.Drawing.Image imgOutput = myBitmap;
   System.Drawing.Bitmap oThumbNail = new Bitmap(twidth, theight, imgOutput.PixelFormat);
   Graphics g = Graphics.FromImage(oThumbNail);
   g.CompositingQuality = System.Drawing.Drawing2D.CompositingQuality.HighSpeed;
   g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighSpeed;
   g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBilinear;
   Rectangle oRectangle = new Rectangle(0, 0, twidth, theight);
   g.DrawImage(imgOutput, oRectangle);
   try
   {
    return oThumbNail;
   }
   catch
   {
    return null;
   }
   finally
   {
    imgOutput.Dispose();
    imgOutput = null;
    MyBrowser.Dispose();
    MyBrowser = null;
   }
  }
 }
}

PS：项目中需要添加引用System.Windows.Forms

希望本文所述对大家asp.net程序设计有所帮助。

富贵资源网 Design By www.hznty.com
广告合作：本站广告合作请联系QQ：858582 申请时备注：广告合作（否则不回）
免责声明：本站资源来自互联网收集,仅供用于学习和交流,请遵循相关法律法规,本站一切资源不代表本站立场,如有侵权、后门、不妥请联系本站删除！
富贵资源网 Design By www.hznty.com
www.hznty.com 富贵资源网
20,135影音资源
44,641技术资源
2,817软件资源
435,032站长资源

友情链接

杰晶网络 DDR爱好者之家 桃源资源网 杰网资源 富贵资源网 南强小屋 铁雪资源网 幽灵资源网 万梅资源网 狼山资源网 白云岛资源网 昆仑资源网 相思资源网 明霞山资源网 内蒙古资源网 黑松山资源网 茶园资源网 饿虎岗资源网 大旗谷资源网 常春岛资源网 岱庙资源网 兴国资源网 快活林资源网 蝙蝠岛资源网 帝王谷资源网 白云城资源网 伏龙阁资源网 清风细雨楼 天枫庄资源网 圆月山庄资源网 无争山庄资源网 神水资源网 移花宫资源网 神剑山庄资源网 无为清净楼资源网 金钱帮资源网 丐帮资源网 华山资源网 极乐门资源网 小李飞刀资源网 凤求凰客栈 风云阁资源网 金狮镖局 鸳鸯亭资源网 千金楼资源网 更多链接
富贵资源网 Design By www.hznty.com