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C#編寫ActiveX網(wǎng)頁截圖控件

 更新時(shí)間：2020年04月16日 10:42:07   作者：大蘿卜控  
這篇文章主要介紹了C#編寫ActiveX網(wǎng)頁截圖控件,作為學(xué)習(xí)C#編寫ActiveX的一個(gè)簡單入門教程，文中示例代碼介紹的非常詳細(xì)，具有一定的參考價(jià)值，感興趣的小伙伴們可以參考一下

故事背景：Java組的小伙伴需要一個(gè)能在IE（還是6。。。）下截圖并返回給網(wǎng)頁的功能，但是IE做起來很麻煩（可能根本做不到），于是找到我寫一個(gè)ActiveX控件實(shí)現(xiàn)此功能，想著可能還有其他小伙伴需要這個(gè)功能，于是就PO出來，供需要的人使用，當(dāng)然也可以作為學(xué)習(xí)C#編寫ActiveX的一個(gè)簡單入門教程（VC++效果更好）。
功能截圖如下：

代碼分為兩個(gè)核心部分：1、C#屏幕截圖；2、C#開發(fā)ActivX控件。
 1、屏幕截圖，這個(gè)在網(wǎng)上找到了一個(gè)只需要5行代碼的實(shí)現(xiàn)（超級精簡），當(dāng)然你也可以費(fèi)點(diǎn)功夫?qū)崿F(xiàn)自由區(qū)域截取圖片，截圖后保存到本地，然后使用二進(jìn)制讀取jpg文件，并編碼為base64返回給網(wǎng)頁

 public string PrintScreen()
  {
   Image baseImage = new Bitmap(Screen.PrimaryScreen.Bounds.Width, Screen.PrimaryScreen.Bounds.Height);
   Graphics g = Graphics.FromImage(baseImage);
   g.CopyFromScreen(new Point(0, 0), new Point(0, 0), Screen.AllScreens[0].Bounds.Size);
   g.Dispose();
   baseImage.Save("D:\\screen.jpg", ImageFormat.Jpeg);
   Stream file = new FileStream("D:\\screen.jpg", FileMode.Open);
   BinaryReader bw = new BinaryReader(file);
   var buffer = new byte[file.Length];
   bw.Read(buffer, 0, buffer.Length);
   bw.Close();
   string b64 = Convert.ToBase64String(buffer);
   return b64;
  }

2、c#開發(fā)ActiveX控件，網(wǎng)上示例比較多
先新建一個(gè)類庫，并設(shè)置項(xiàng)目屬性，COM可見 

并為COM互注冊，這樣編譯完了會自動注冊COM控件

完成設(shè)置后，編寫代碼，如下： 

using System;
using System.Collections.Generic;
using System.Text;
using System.Runtime.InteropServices;

namespace PrintScreenLib
{
 //為了讓ActiveX控件獲得客戶端的信任，控件類需要實(shí)現(xiàn)一個(gè)名為“IObjectSafety”的接口。先創(chuàng)建該接口（注意，不能修改該接口的GUID值）
 [ComImport, Guid("CB5BDC81-93C1-11CF-8F20-00805F2CD064")]
 [InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
 public interface IObjectSafety
 {
 [PreserveSig]
 int GetInterfaceSafetyOptions(ref Guid riid, [MarshalAs(UnmanagedType.U4)] ref int pdwSupportedOptions, [MarshalAs(UnmanagedType.U4)] ref int pdwEnabledOptions);

 [PreserveSig()]
 int SetInterfaceSafetyOptions(ref Guid riid, [MarshalAs(UnmanagedType.U4)] int dwOptionSetMask, [MarshalAs(UnmanagedType.U4)] int dwEnabledOptions);
 }
}

新建用戶控件，并派生IObjectSafe接口，接口實(shí)現(xiàn)是固定內(nèi)容 

 [Guid("61D7F413-A1B2-48A9-B851-5BFBCF50280C")] //使用VS工具里的GUID生成器生成唯一碼
 public partial class PSLib : UserControl, IObjectSafety
 {
 #region IObjectSafety 成員
 private const string _IID_IDispatch = "{00020400-0000-0000-C000-000000000046}";
 private const string _IID_IDispatchEx = "{a6ef9860-c720-11d0-9337-00a0c90dcaa9}";
 private const string _IID_IPersistStorage = "{0000010A-0000-0000-C000-000000000046}";
 private const string _IID_IPersistStream = "{00000109-0000-0000-C000-000000000046}";
 private const string _IID_IPersistPropertyBag = "{37D84F60-42CB-11CE-8135-00AA004BB851}";

 private const int INTERFACESAFE_FOR_UNTRUSTED_CALLER = 0x00000001;
 private const int INTERFACESAFE_FOR_UNTRUSTED_DATA = 0x00000002;
 private const int S_OK = 0;
 private const int E_FAIL = unchecked((int)0x80004005);
 private const int E_NOINTERFACE = unchecked((int)0x80004002);

 private bool _fSafeForScripting = true;
 private bool _fSafeForInitializing = true;


 public int GetInterfaceSafetyOptions(ref Guid riid, ref int pdwSupportedOptions, ref int pdwEnabledOptions)
 {
 int Rslt = E_FAIL;

 string strGUID = riid.ToString("B");
 pdwSupportedOptions = INTERFACESAFE_FOR_UNTRUSTED_CALLER | INTERFACESAFE_FOR_UNTRUSTED_DATA;
 switch (strGUID)
 {
 case _IID_IDispatch:
 case _IID_IDispatchEx:
  Rslt = S_OK;
  pdwEnabledOptions = 0;
  if (_fSafeForScripting == true)
  pdwEnabledOptions = INTERFACESAFE_FOR_UNTRUSTED_CALLER;
  break;
 case _IID_IPersistStorage:
 case _IID_IPersistStream:
 case _IID_IPersistPropertyBag:
  Rslt = S_OK;
  pdwEnabledOptions = 0;
  if (_fSafeForInitializing == true)
  pdwEnabledOptions = INTERFACESAFE_FOR_UNTRUSTED_DATA;
  break;
 default:
  Rslt = E_NOINTERFACE;
  break;
 }

 return Rslt;
 }

 public int SetInterfaceSafetyOptions(ref Guid riid, int dwOptionSetMask, int dwEnabledOptions)
 {
 int Rslt = E_FAIL;

 string strGUID = riid.ToString("B");
 switch (strGUID)
 {
 case _IID_IDispatch:
 case _IID_IDispatchEx:
  if (((dwEnabledOptions & dwOptionSetMask) == INTERFACESAFE_FOR_UNTRUSTED_CALLER) &&
  (_fSafeForScripting == true))
  Rslt = S_OK;
  break;
 case _IID_IPersistStorage:
 case _IID_IPersistStream:
 case _IID_IPersistPropertyBag:
  if (((dwEnabledOptions & dwOptionSetMask) == INTERFACESAFE_FOR_UNTRUSTED_DATA) &&
  (_fSafeForInitializing == true))
  Rslt = S_OK;
  break;
 default:
  Rslt = E_NOINTERFACE;
  break;
 }

 return Rslt;
 }
 #endregion

IE調(diào)用ActiveX控件： 

<!DOCTYPE html>
<html>
 <head>
 <title>測試</title>
 
 <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
 <meta http-equiv="description" content="this is my page">
 <meta http-equiv="content-type" content="text/html; charset=UTF-8">
 <script>
 function jt(){
 var str="";
 try
 {
 var obj = document.getElementById("MyActiveX"); 
  str=obj.PrintScreen();
 }
 catch(e)
 {
 alert(e);
 return;
 }

 var img=document.getElementById("img");
 img.src="data:image/jpeg;base64,"+str;//接受base64編碼后的圖片
 }
 </script>
 </head>
 
 <body>
 <OBJECT ID="MyActiveX" WIDTH="120" HEIGHT=20" CLASSID="CLSID:61D7F413-A1B2-48A9-B851-5BFBCF50280C"></OBJECT>
 <input type="button" value="截圖" onclick="jt();">
 <Image id ="img" />
 </body>
</html>

一個(gè)完整的ActvieX控件就完成了，這里沒有使用到事件，如果使用事件的話會更加麻煩一點(diǎn)。

下載：屏幕截圖ActivX控件

以上就是本文的全部內(nèi)容，希望對大家的學(xué)習(xí)有所幫助，也希望大家多多支持腳本之家。

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