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