C#创建ActiveX

因为最近的项目可能会用到调用外部设备，读取信息。为了和现有的BS系统兼容，并以较小的代价满足需求，于是想到了使用ActiveX技术（也有人建议使用Silverlight），这技术虽然比较早了，但还是能够满足目前的需求的

所以在网上找了找资料看看，折腾了两天，总算有点效果了

现在记录一下大致的过程

1、创建一个类库，用于生成ActiveX组件

　　A、实现IObjectSafety接口

    [ComImport, GuidAttribute("CB5BDC81-93C1-11CF-8F20-00805F2CD064")]
    [InterfaceTypeAttribute(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);
    }

　　B、实现IOleClientSite接口

    [ComImport, Guid("00000118-0000-0000-C000-000000000046"), InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
    public interface IOleClientSite
    {
        void SaveObject();
        void GetMoniker(uint dwAssign, uint dwWhichMoniker, object ppmk);
        void GetContainer(out IOleContainer ppContainer);
        void ShowObject();
        void OnShowWindow(bool fShow);
        void RequestNewObjectLayout();
    }

　　C、实现IOleContainer接口

    [ComImport, Guid("0000011B-0000-0000-C000-000000000046"), InterfaceTypeAttribute(ComInterfaceType.InterfaceIsIUnknown)]
    public interface IOleContainer
    {
        void EnumObjects([In, MarshalAs(UnmanagedType.U4)] int grfFlags,
          [Out, MarshalAs(UnmanagedType.LPArray)] object[] ppenum);
        void ParseDisplayName([In, MarshalAs(UnmanagedType.Interface)] object pbc,
          [In, MarshalAs(UnmanagedType.BStr)] string pszDisplayName,
          [Out, MarshalAs(UnmanagedType.LPArray)] int[] pchEaten,
          [Out, MarshalAs(UnmanagedType.LPArray)] object[] ppmkOut);
        void LockContainer([In, MarshalAs(UnmanagedType.I4)] int fLock);
    }

其中A为ActiveX组件必需，

B和C是为了与页面中的JS进行交互

以下为A在组件中的实现

#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

以下为B和C的使用（这是使用的一个示例，可以根据需要自行处理）

#region CallJavaScript

        private void CallJavaScript(string Filenames)

        {
            Type typeIOleObject = this.GetType().GetInterface("IOleObject", true);

            object oleClientSite = typeIOleObject.InvokeMember(
                                                        "GetClientSite",
                                                        BindingFlags.Instance | BindingFlags.InvokeMethod | BindingFlags.Public,
                                                        null,
                                                        this,
                                                        null);

            IOleClientSite oleClientSite2 = oleClientSite as IOleClientSite;

            IOleContainer pObj;

            oleClientSite2.GetContainer(out pObj);

            //参数数组

            object[] args = new object[1];

            args[0] = Filenames;

            //获取页面的Script集合

            IHTMLDocument pDoc2 = (IHTMLDocument)pObj;

            object script = pDoc2.Script;

            try

            {
                //调用JavaScript方法OnScaned并传递参数，因为此方法可能并没有在页面中实现，所以要进行异常处理
                script.GetType().InvokeMember(
                                        "OnScaned",
                                        BindingFlags.Instance | BindingFlags.InvokeMethod | BindingFlags.Public,
                                        null,
                                        script,
                                        args);
            }
            catch { }
        }

        #endregion CallJavaScript

上面的代码基本上就是ActiveX实现的内容了，再实现自己一些Public方法就可以了，下面说说如何打包

（一些设置之类的，网上都有说）

        /// <summary>
        /// 获取客户端主机的MAC地址
        /// </summary>
        /// <returns></returns>
        public string GetMacAddress()
        {
            var mc = new ManagementClass("Win32_NetworkAdapterConfiguration");
            var mos = mc.GetInstances();
            var sb = new StringBuilder();

            foreach (ManagementObject mo in mos)
            {
                var macAddress = mo["MacAddress"];

                if (macAddress != null)
                    sb.AppendLine(macAddress.ToString());
            }

            return sb.ToString();
        }

　　另见：注意事项

　　附件：

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