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; } } }
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