C# · 12月 26, 2021

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,hDrawDC.GetHdc(),new NativeMethods.COMRECT(bmpRect),0); Marshal.Release(pViewObject); } catch (Exception ex) { Console.WriteLine(ex.Message); throw ex; } //释放 hDrawDC.Dispose(); return pPicture; } }}