c# ActiveX 控件的开发

2022-09-10 07:58:12

关于ActiveX控件的开发,网上很多例子,昨天也整整研究一天才捋顺了.

网上大部分例子都是js调用控件的方法,由于要实现在html页面"相应"控件的事件,整整折腾一天.

关键点在于 "创建ActiveX控件" 的第2,和第7

该技术局限性较大,如浏览器端需安装 .net 框架,仅限于IE浏览器.

关于ActiveX的证书及浏览器安装时设置,可参考 http://www.cnblogs.com/weixing/archive/2013/06/28/3161165.html 这也是我看到比较详细的介绍了.

创建ActiveX控件
1.创建一个类库;
2.项目属性-应用程序-程序集信息-"使程序集COM可见"勾上;
3.项目属性-生成-"为COM互操作注册"勾上.(这个折腾一天,否则注册事件不可用);
4.创建接口: IObjectSafety (注意GUID不能变);
5.创建ActiveX控件的基类并实现IObjectSafety,ActiveX控件可以继承它来减少代码;
6.创建一个ActiveX自定义控件如:ActiveXDemo1;
7.定义ActiveXDemo1的"方法接口"及"事件接口".(如使用自定义事件需用此方式), "事件接口"成员应加上[DispId(x)]标识;
8.创建ActiveX控件完成.

IObjectSafety 接口定义

    [ComImport, Guid("4A359FBB-C9A4-494E-B048-AC068DB4FCB2")] //该GUID不能变
    [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);
    }
}

ActiveX控件基类(ActiveXControlBase)

    public class ActiveXControlBase : IObjectSafety
    {
        #region IObjectSafety 成员

        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
    }

　　自定义ActiveX控件

    [ComVisible(true)]
    [Guid("684AAD87-C086-4F27-AE55-941A1AAC7212")]
    [InterfaceType(ComInterfaceType.InterfaceIsIDispatch)]
    public interface IThreadDemoEvent
    {
        [DispId(1)] //使用事件,必须加上该标识
        void ShowMessage1(string str_Msg);
        [DispId(2)]
        void ShowMessage2(string str_Msg);
    }

    [ComVisible(true)]
    [Guid("4D12136B-9545-423B-A110-B9405ADF8B30")]
    [InterfaceType(ComInterfaceType.InterfaceIsDual)]
    public interface IThreadDemo
    {
        string StartTimer();
        string StopTimer();
    }

    [Guid("2B4FCB85-A3B7-43BD-B104-7380E7F3483F"),
     ClassInterface(ClassInterfaceType.AutoDual),
     ComDefaultInterface(typeof(IThreadDemo)),
     ComSourceInterfaces(typeof(IThreadDemoEvent)),
     ComVisible(true)
    ]
    public class ActivexThreadDemo : ActiveXControlBase, IThreadDemo
    {
        ~ActivexThreadDemo()
        {
            ShowMessage1("释放了啊");
        }

        Thread _th;
        bool _isStop;

        public event ShowMessageHandle ShowMessage1;
        public event ShowMessageHandle ShowMessage2;

        void ThreadMethd()
        {
            while (true)
            {
                Thread.Sleep(3000);
                if (ShowMessage1 != null)
                {
                    ShowMessage1.Invoke(DateTime.Now.ToString());
                }
                if (_isStop) break;
            }
            _th.Abort();
            _th = null;
        }

        public string StartTimer()
        {
            if (_th == null)
            {
                _isStop = false;
                _th = new Thread(ThreadMethd);
                _th.IsBackground = false;
                _th.Start();
                return "开起计时";
            }
            if (ShowMessage2 != null)
            {
                ShowMessage2("执行了 StartTimer");
            }
            return "已经开起过计时;";
        }

        public string StopTimer()
        {            
            if (_isStop)
            {                
                return "已经停止计时了!";
            }
            else
            {
                _isStop = true;
                return "停止计时";
            }            
        }
    }

注意:
不能使用泛型委托来声明事件,如:public event Action<T> ShowMessageHandle;
当类里面包含 static成员,刷新页面不会清空
跨线程触发事件: [事件].Invoke(参数1,参数2 ...);

ActiveX控件Setup
1.创建Installer项目;
2.右击项目添加->项目输出打开添加项目输出组对话框，并选择ActiveX控件类库;
3.主输出文件的属性 Register 值为 vsdrpCOM (关键),RemovePreviousVersions 设置为true

web页面测试;
1.创建一个object 标签,calassid为控件GUID
<object id="ActiveXObj1" classid="clsid:3BCF612C-91CF-4543-83BB-FD2331FDDCB6" ></object>
2.调用控件方法
var r = document.ActiveXObj1.Test1();
3."注册控件的事件"
<script language="javascript" type="text/javascript" for="ActiveXObj1" event="ShowMessage1(msg)">
alert("ActiveXObj1 ："+ msg )
</script>

<html xmlns="http://www.w3.org/1999/xhtml">
<head>
    <title>ActiveX测试页面</title>    
    
    <script type="text/javascript">

        function test1() {
            var r = document.ActiveXObj1.Test1();
            window.status = r;
        }

        function StartTimer() {
            alert(document.ActiveThreadEvent);
            var r = document.ActiveThreadEvent.StartTimer();
            window.status = r;
        }
        function StopTimer() {
            var r = document.ActiveThreadEvent.StopTimer();
            window.status = r;
        }
    </script>
    <!--事件的注册-->
    <script language="javascript" type="text/javascript" for="ActiveXObj1" event="ShowMessage1(msg)">           
        alert("ActiveXObj1 ："+ msg )
    </script>
     <script language="javascript" type="text/javascript" for="ActiveXObj1" event="ShowMessage2(msg)">           
        alert("ActiveXObj1:" + msg)
    </script>

    <!--线程事件注册-->
    <script language="javascript" type="text/javascript" for="ActiveThreadEvent" event="ShowMessage1(msg)">           
        alert("ActiveThreadEvent ："+ msg )
    </script>
     <script language="javascript" type="text/javascript" for="ActiveThreadEvent" event="ShowMessage2(msg)">           
        alert("ActiveThreadEvent:" + msg)
    </script>
</head>
<body> 
 <object id="ActiveXObj1" classid="clsid:3BCF612C-91CF-4543-83BB-FD2331FDDCB6" ></object>
 <br />
 <object id="ActiveThreadEvent" classid="clsid:2B4FCB85-A3B7-43BD-B104-7380E7F3483F" ></object>
 <br />
  <br />
  <input type="button" value="测试4-相应事件!" onclick="test1();" /><br />
  <input type="button" value="开始计时!" onclick="StartTimer();" /><br />
  <input type="button" value="停止计时!" onclick="StopTimer();" /><br />
  
</body>
</html>

源码共享: 戳我

c# ActiveX 控件的开发

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