C#教程之C#实现将网页保存成图片的网页拍照功能

当前位置:

首页 > c#编程 >

C#教程之C#实现将网页保存成图片的网页拍照功能

本文实例主要实现了网页照相机程序的功能。C#实现将网页保存成图片格式，简单实现网页拍照，主要是基于ActiveX 组件的网页快照类，AcitveX 必须实现 IViewObject 接口。因此读者完全可扩展此类将其用于你的C#软件项目中。在此特别感谢作者：随飞提供的代码。

主要功能代码如下：

			?

								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 组件快照类，用于网页拍照，将网页保存成图片

								  /// AcitveX 必须实现 IViewObject 接口

								  /// 作者:随飞

								  /// </summary>

								  public class Snapshot

								  {

								    /// <summary>

								    /// 取快照

								    /// </summary>

								    /// <param name="pUnknown">Com 对象</param>

								    /// <param name="bmpRect">图象大小</param>

								    /// <returns></returns>

								    public Bitmap TakeSnapshot(object pUnknown, Rectangle bmpRect)

								    {

								      if (pUnknown == null)

								        return null;

								      //必须为com对象

								      if (!Marshal.IsComObject(pUnknown))

								        return null;

								      //IViewObject 接口

								      SnapLibrary.UnsafeNativeMethods.IViewObject ViewObject = null;

								      IntPtr pViewObject = IntPtr.Zero;

								      //内存图

								      Bitmap pPicture = new Bitmap(bmpRect.Width, bmpRect.Height);

								      Graphics hDrawDC = Graphics.FromImage(pPicture);

								      //获取接口

								      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;

								        //调用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;

								      }

								      //释放

								      hDrawDC.Dispose();

								      return pPicture;

								    }

								  }

								}

栏目列表