using System;using System.Collections.Generic;using System.Text;using System.Runtime.InteropServices;using System.Runtime.InteropServices.ComTypes;using System.Drawing;using System.Windows.Forms;namespace SnapLibrary{  /// <summary>  /// ActiveX 組件快照類，用于網頁拍照，將網頁保存成圖片  /// AcitveX 必須實現 IViewObject 接口  /// 作者:隨飛  /// </summary>  public class Snapshot  {    /// <summary>    /// 取快照    /// </summary>    /// <param name="pUnknown">Com 對象</param>    /// <param name="bmpRect">圖象大小</param>    /// <returns></returns>    public Bitmap TakeSnapshot(object pUnknown, Rectangle bmpRect)    {      if (pUnknown == null)        return null;      //必須為com對象      if (!Marshal.IsComObject(pUnknown))        return null;      //IViewObject 接口      SnapLibrary.UnsafeNativeMethods.IViewObject ViewObject = null;      IntPtr pViewObject = IntPtr.Zero;      //內存圖      Bitmap pPicture = new Bitmap(bmpRect.Width, bmpRect.Height);      Graphics hDrawDC = Graphics.FromImage(pPicture);      //獲取接口      object hret = Marshal.QueryInterface(Marshal.GetIUnknownForObject(pUnknown),        ref UnsafeNativeMethods.IID_IViewObject, out pViewObject);      try      {        ViewObject = Marshal.GetTypedObjectForIUnknown(pViewObject, typeof(SnapLibrary.UnsafeNativeMethods.IViewObject)) as SnapLibrary.UnsafeNativeMethods.IViewObject;        //調用Draw方法        ViewObject.Draw((int)DVASPECT.DVASPECT_CONTENT,          -1,          IntPtr.Zero,          null,          IntPtr.Zero,          hDrawDC.GetHdc(),          new NativeMethods.COMRECT(bmpRect),          null,          IntPtr.Zero,          0);        Marshal.Release(pViewObject);      }      catch (Exception ex)      {        Console.WriteLine(ex.Message);        throw ex;      }      //釋放      hDrawDC.Dispose();      return pPicture;    }  }}