抓取网页为图片

 论坛的提问贴，有实用价值：http://topic.csdn.net/u/20071009/10/ee7b6234-2c8b-4eeb-9b13-199f09d22303.html

 

using System;
using System.Data;
using System.Windows.Forms;
using System.Drawing;

/// <summary>
/// WebSnap ：网页抓图对象
/// </summary>
public class WebSnap
{


    public WebSnap()
    {
        //
        // TODO: 在此处添加构造函数逻辑
        //
    }

    /// <summary>
    /// 开始一个抓图并返回图象
    /// </summary>
    /// <param name="Url">要抓取的网页地址</param>
    /// <returns></returns>
    public Bitmap StartSnap(string Url)
    {
        WebBrowser myWB = this.GetPage(Url);
        Bitmap returnValue = this.SnapWeb(myWB);
        myWB.Dispose();
        return returnValue;
    }

    private WebBrowser GetPage(string Url)
    {
        WebBrowser myWB = new WebBrowser();
        myWB.ScrollBarsEnabled = false;
        myWB.Navigate(Url);
        while (myWB.ReadyState != WebBrowserReadyState.Complete)
        {
            System.Windows.Forms.Application.DoEvents();
        }
        return myWB;
    }

    private Bitmap SnapWeb(WebBrowser wb)
    {
        HtmlDocument hd = wb.Document;
        int height = Convert.ToInt32(hd.Body.GetAttribute("scrollHeight")) + 10;
        int width = Convert.ToInt32(hd.Body.GetAttribute("scrollWidth")) + 10;
        wb.Height = height;
        wb.Width = width;
        Bitmap bmp = new Bitmap(width, height);
        Rectangle rec = new Rectangle();
        rec.Width = width;
        rec.Height = height;
        wb.DrawToBitmap(bmp, rec);
        return bmp;
    }

}

 

    protected void Button1_Click(object sender, EventArgs e)
    {
        WebSnap ws = new WebSnap();
        Bitmap bmp = ws.StartSnap(TextBox1.Text);
        System.IO.MemoryStream ms = new System.IO.MemoryStream();
        bmp.Save(ms, System.Drawing.Imaging.ImageFormat.Jpeg);
        Response.BinaryWrite(ms.GetBuffer());
    }