解決OCX （ActiveX）事件註冊IE事件回撥

阿新 • • 發佈：2019-01-14

OCX在事件註冊方面C#版本一般實現可能有問題——光使用事件代理註冊事件是不行的，需要註冊允許COM通訊。

引文講述

In IE11, the attachEvent has been dropped in favour of addEventListener.

Nevertheless, when I replace all the attachEvent instances that were used to bind to events triggered by the activeX, such events are no longer triggered.

Here are some html code examples that illustrate the problem.

(I have created a simple activeX based on an MFC activeX control that simply triggers an event inside OnCreate. This event sends 2 strings as parameters. If you need the code or even the ocx file for the activeX, please let me know.)

Test 1:

<!DOCTYPE html><html><head><title>TestEvent Example HTML</title><metacharset="utf-8"><metahttp-equiv="X-UA-Compatible"content="IE=edge"><metaname="description"content=""><metaname="viewport"content="width=device-width, initial-scale=1"><scriptlanguage 
='javascript'for="testAxEvent"event="testEvent(szType, szValue)">// Test 1 - statically load the script (This is the basis for the hack)// Works on IE8, IE9, IE10 and IE11var MSG = document.getElementById("msg");
			MSG.innerHTML = szType +" : "+ szValue;</script></head><body><table><tr><td><OBJECTID='testAxEvent'CLASSID='CLSID:BA19A985-C93E-491B-B801-2EB7F903C8CE'codebase="testAxEvent.cab"></OBJECT></td></tr><tr><tdheight='30'></td></tr><tr><tdalign=center><fontsize=5><divid='msg'></div></font></tr></table></body></html>

Test 2:

<!DOCTYPE html><html><head><title>TestEvent Example HTML</title><metacharset="utf-8"><metahttp-equiv="X-UA-Compatible"content="IE=edge"><metaname="description"content=""><metaname="viewport"content="width=device-width, initial-scale=1"></head><body><table><tr><td><OBJECTID='testAxEvent'CLASSID='CLSID:BA19A985-C93E-491B-B801-2EB7F903C8CE'codebase="testAxEvent.cab"width='120'height='80'></OBJECT></td></tr><tr><tdheight='30'></td></tr><tr><tdalign=center><fontsize=5><divid='msg'></div></font></tr></table></body><script>// Test 2 - attachEvent// Works on IE8, IE9 and IE10// Does not work on IE11function onTestEvent(szType, szValue){var MSG = document.getElementById("msg");
			MSG.innerHTML = szType +" : "+ szValue;}var elem = document.getElementById("testAxEvent");
		elem.attachEvent("testEvent", onTestEvent);</script></html>

Test 3:

<!DOCTYPE html><html><head><title>TestEvent Example HTML</title><metacharset="utf-8"><metahttp-equiv="X-UA-Compatible"content="IE=edge"><metaname="description"content=""><metaname="viewport"content="width=device-width, initial-scale=1"></head><body><table><tr><td><OBJECTID='testAxEvent'CLASSID='CLSID:BA19A985-C93E-491B-B801-2EB7F903C8CE'codebase="testAxEvent.cab"width='120'height='80'></OBJECT></td></tr><tr><tdheight='30'></td></tr><tr><tdalign=center><fontsize=5><divid='msg'></div></font></tr></table></body><script>function onTestEvent(szType, szValue){var MSG = document.getElementById("msg");
			MSG.innerHTML = szType +" : "+ szValue;}var elem = document.getElementById("testAxEvent");// Test 3 - addEventListener// Does not work on IE11 !
		elem.addEventListener("testEvent", onTestEvent,true);
		elem.addEventListener("testEvent", onTestEvent,false);</script></html>

Test 1 uses the "for" tag to setup the callback to the activeX event. This is successful on all versions IE8, 9, 10 and 11.

Test 2 uses attachEvent to bind the callback to the object element. The callback is correctly called on IE8, 9 and 10 but not on IE11, as was expected.

Test 3 replaces attachEvent with addEventListener. Still the event is not triggered on IE11.

What am I missing here? Am I not using the correct addEventListener syntax? Does addEventListener supports binding to activeX events at all? Do I need to make changes to the calling conventions on the activeX side?

解決方案

下面說一下關鍵步驟：

1、生產自己的ActiveX控制元件，相關的Guid需要注意。

2、定義自定義事件：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Runtime.InteropServices;
using System.Text;
using System.Threading.Tasks;

namespace CvNetVideo.Event
{
   
    /// <summary>
    /// 全屏事件代理
    /// </summary>
    public delegate void FullScreenEvent(bool isFullScreen);

    /// <summary>
    /// 直播結束事件代理
    /// </summary>
    public delegate void RealTimeLiveAllStopEvent();

    /// <summary>
    /// 控制元件雙擊事件代理
    /// </summary>
    public delegate void ControlDoubleClickEvent(bool isFullScreen);


    [GuidAttribute("1A585C4D-3371-48dc-AF8A-AFFECC1B0967")]
    [InterfaceTypeAttribute(ComInterfaceType.InterfaceIsIDispatch)]
    public interface ControlEvents
    {
        [DispIdAttribute(0x001)]
        void OnFullScreenEvent(bool isFullScreen);
        [DispIdAttribute(0x002)]
        void OnRealTimeLiveAllStopEvent();
        [DispIdAttribute(0x003)]
        void OnControlDoubleClickEvent(bool isFullScreen);
    }
}

3、控制元件註冊引用COM

 [Guid("2769FF99-A41F-4AC4-99AD-9CABEB8F83D4")]
    //指示應用該屬性的物件對COM可見
    [ComVisible(true)]
    //將事件接收介面連線到託管類
    [ComSourceInterfacesAttribute(typeof(ControlEvents))]
    public partial class UCVideo : ActiveXControl, ACDCallBack, ChejiCallBack, MPlayerCallBack
    {
        #region 控制元件與IE代理事件
        // 全屏或退出全屏事件
        public event FullScreenEvent OnFullScreenEvent;
        // 直播退出事件
        public event RealTimeLiveAllStopEvent OnRealTimeLiveAllStopEvent;
        // 控制元件雙擊事件
        public event ControlDoubleClickEvent OnControlDoubleClickEvent;
        #endregion

4、引用例項

 /// <summary>
        /// 全屏或關閉全屏(IE控制全屏)
        /// </summary>
        /// <param name="isFullScreen"></param>
        /// <returns></returns>
        public bool FullScreen(bool isFullScreen)
        {
            // 操作全屏或關閉全屏
            OpenOrCloseFullScreen(isFullScreen);
            // 全屏事件回撥註冊
            OnFullScreenEvent?.Invoke(isFullScreen);
            return isFullScreen;
        }

5、IE呼叫註冊事件

 <object id="cSharpActiveX" classid="clsid:2769FF99-A41F-4AC4-99AD-9CABEB8F83D4"></object>

    <script language="javascript" for="cSharpActiveX" event="OnFullScreenEvent(isFullScreen)" type="text/javascript">
        alert(isFullScreen ? "全屏事件" : "退出全屏事件");
    </script>

MFC可以參考：https://blog.csdn.net/wu_tongyu/article/details/39530349

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