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
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