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.NET Forum / .NET Framework / Interop / September 2005Simply Call a method from a OCX?
Hello alltogether. I hope anyone of you can help me. I have a OCX-file (arsole.ocx) which contains one class. I need to call some methods of this class. They have BSTR parameters and return SHORTs (The return codes are not required to catch). When I am trying to include the OCX through the automatic generated wrapper (Interop.ARSOLELib) then all calls fail ("catastrophic failure")... I do not need a instance of the class itself. I just need to call some simple methods. Thanks in advance. Hi! > I have a OCX-file (arsole.ocx) which contains one class. I need to call > some methods of this class. They have BSTR parameters and return SHORTs [quoted text clipped - 6 lines] > I do not need a instance of the class itself. I just need to call some > simple methods. You definitely need an instance. Rob Hi Robert. How can I easily get an instance to call those methods. Is there any way to instance a OCX classwithout using a wrapper? In old VB you could create an object through late binding. Isnt it possible to do this in .NET? Are there any tutorials on that matter? Thanks in advance. Sebastian > Hi Robert. > > How can I easily get an instance to call those methods. Is there any > way to instance a OCX classwithout using a wrapper? > In old VB you could create an object through late binding. Isnt it > possible to do this in .NET? You can use reflection: object comObject = Activator.CreateInstance ( Type.GetTypeFromProgID("ProgId")); object result = comObject.GetType().InvokeMember ( "MethodName", BindingFlags.InvokeMethod, null, comObject, new object[] {arg1, arg2 , ...} ); Rob Hi Robert. Thanks for the answer. It worked so far that I can get a instance of my class (I used the GetTypeFromCLSID function). But my problem is that I cannot invoke any methods. When I am listing all methods of the type (using type.GetMethods) it seems that the object is represented as a MarshalByRefObject class. The List of available methods consists of: - CreateObjRef - GetLifetimeService - InitializeLifetimeService What shall I do to get a real method of the class invoked? Tanks in advance Sebastian Hi! > Thanks for the answer. It worked so far that I can get a instance of my > class (I used the GetTypeFromCLSID function). [quoted text clipped - 8 lines] > > What shall I do to get a real method of the class invoked? Please post some parts of the IDL of the OCX, especially the coclass and its interfaces. Rob Where do I get the IDL from? ILDASM of the Interop-class? Sebastian > Where do I get the IDL from? > ILDASM of the Interop-class? > > Sebastian OleView on the ocx. Rob library ARSOLELib { // TLib : // TLib : OLE Automation : {00020430-0000-0000-C000-000000000046} importlib("stdole2.tlb"); // Forward declare all types defined in this typelib dispinterface _DArsOle; dispinterface _DArsOleEvents; [ uuid(B374D541-4DA7-11D0-B540-0004AC94759C), version(1.0), helpstring("Dispatch interface for OnDemand Control"), hidden ] dispinterface _DArsOle { properties: methods: [id(0x00000001)] short GetControlId(VARIANT* pControlId); [id(0x00000002)] short GetNumServers(VARIANT* pNumServers); [id(0x00000003)] short GetServerNames( IUnknown* pNames, short MaxNames); [id(0x00000004)] short Logon( BSTR pServer, BSTR pUserId, BSTR pPassword); ... [id(0xfffffdd8)] void AboutBox(); }; [ uuid(B374D542-4DA7-11D0-B540-0004AC94759C), version(1.0), helpstring("Event interface for OnDemand Control") ] dispinterface _DArsOleEvents { properties: methods: ... }; [ uuid(B374D543-4DA7-11D0-B540-0004AC94759C), version(1.0), helpstring("OnDemand Control"), control ] coclass ArsOle { [default] dispinterface _DArsOle; [default, source] dispinterface _DArsOleEvents; }; }; Free MagazinesGet these publications absolutely FREE for up to 12 months. There are no hidden fees and no obligation. Simply choose a title, complete the application form and submit it. Read more ...
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