对指定的网页进行截图(C#版)

2010-08-28 10:52:01来源：西部e网作者：

碰到一个项目，需要对指定的网页进行截图保存，晕死！

需求永远都是怪异的.....
解决是关键～

遂写了以下代码，快准狠!（因为赶时间！）
可以实现对指定的页面获取，按指定的大小生成缩略图，当然也可以1：1的产生图，
页面上的javascript 运行对截图貌似没任何影响，相当的正常，我个人都觉得很神奇。

首先对项目添加系统引用
System.Drawing;
System.Drawing.Design;
System.Windows.Forms;

获取指定网页并转换成图片的类：

using System;
using System.Collections.Generic;
using System.Text;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Drawing.Imaging;
using System.Windows.Forms;
using System.Diagnostics;

namespace MyLib
{
    public class GetImage
    {
        private int S_Height;
        private int S_Width;
        private int F_Height;
        private int F_Width;
        private 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.ScreenWidth = ScreenWidth;
            this.ScreenHeight = ScreenHeight;
            this.ImageHeight = ImageHeight;
            this.ImageWidth = ImageWidth;
        }

        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;
        }
    }

    class WebPageBitmap
    {
        WebBrowser MyBrowser;
        string URL;
        int Height;
        int Width;

        public WebPageBitmap(string url, int width, int height)
        {
            this.Height = height;
            this.Width = width;
            this.URL = url;
            MyBrowser = new WebBrowser();
            MyBrowser.ScrollBarsEnabled = false;
            MyBrowser.Size = new Size(this.Width, this.Height);
        }

        public void GetIt()
        {
            MyBrowser.Navigate(this.URL);
            while (MyBrowser.ReadyState != WebBrowserReadyState.Complete)
            {
                Application.DoEvents();
            }
        }

        public Bitmap DrawBitmap(int theight, int twidth)
        {
            Bitmap myBitmap = new Bitmap(Width, Height);
            Rectangle DrawRect = new Rectangle(0, 0, Width, Height);
            MyBrowser.DrawToBitmap(myBitmap, DrawRect);
            System.Drawing.Image imgOutput = myBitmap;
            System.Drawing.Image oThumbNail = new Bitmap(twidth, theight, imgOutput.PixelFormat);
            Graphics g = Graphics.FromImage(oThumbNail);
            g.CompositingQuality = CompositingQuality.HighSpeed;
            g.SmoothingMode = SmoothingMode.HighSpeed;
            g.InterpolationMode = InterpolationMode.HighQualityBilinear;
            Rectangle oRectangle = new Rectangle(0, 0, twidth, theight);
            g.DrawImage(imgOutput, oRectangle);
            try
            {

                return (Bitmap)oThumbNail;
            }
            catch (Exception ex)
            {
                return null;
            }
            finally
            {
                imgOutput.Dispose();
                imgOutput = null;
                MyBrowser.Dispose();
                MyBrowser = null;
            }
        }
    }

}

以下是调用方法，懒省事的方法，嘿嘿，赶时间就不说什么了，反正上面的抓取转换类已经写出来了，大家尽情的用异步，线程等方法自己玩吧！～

    string UrlPath;
    bool CaptureState = false;
    Guid guid;
    protected bool SaveOriginalPageToImage(Guid myGuid)
    {
//使用guid 来命名
        guid = myGuid;
        if (this.CurrentPageAct == PageAct.Edit)
        {
            string PagePath = Request.Url.LocalPath;
            PagePath = PagePath.Replace("Operation", "Capture");

            UrlPath = PagePath + "?act=view&ProjectNo=" + _projectNo;

            Thread NewTh = new Thread(CaptureImage);
            NewTh.SetApartmentState(ApartmentState.STA);
            NewTh.Start();
            while (NewTh.ThreadState == ThreadState.Running)
            {
            }
            //返回截取状态
            return CaptureState;
        }
        return false;
    }

       /// <summary>
    /// 捕获屏幕
    /// </summary>
    /// <param name="UrlPath"></param>
    /// <returns></returns>
    public void CaptureImage()
    {
        try
        {
            string url = "http://" + Request.Url.Host + ":" + Request.Url.Port.ToString();
            url = url + UrlPath;

            GetImage thumb = new GetImage(url, 1024, 1200, 1024, 1200);
            System.Drawing.Bitmap x = thumb.GetBitmap();
            string FileName = DateTime.Now.ToString("yyyyMMddhhmmss");

            x.Save(Server.MapPath("~/Capture/SavePage") + "\\" + guid + ".jpg");
            CaptureState = true;
        }
        catch (Exception ex)
        {
            CaptureState = false;
        }
    }

关键词：C#

对指定的网页进行截图(C#版)

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