VC ATL, C++ COM-Object with COM-Object as parameter

C++ COM-Object with COM-Object as parameter

Author	Message
markus244.. #1 / 5	C++ COM-Object with COM-Object as parameter Hi, i'm new in programming COM-objects and it would be very nice if someone could help me with the following problem. I have to create an COM-object in C++ and the Interface has to be able to get an COM-object as parameter. Is it possible to do this and if yes how would be the syntax? Thanks in advance Markus Sent via Deja.com http://www.--*.com/
Mon, 07 Jul 2003 15:51:48 GMT

y.. #2 / 5	C++ COM-Object with COM-Object as parameter Quote: > Hi, > i'm new in programming COM-objects and it would be very nice if someone > could help me with the following problem. > I have to create an COM-object in C++ and the Interface has to be able > to get an COM-object as parameter. > Is it possible to do this and if yes how would be the syntax? > Thanks in advance > Markus> Hi, there. It's easy - every COM interface is derived from IUnknown, so just pass IUnknown* of any COM object and inside the interface function do QueryInterface(....). BTW, don't forget AddRef() and Release(). Regards. Sent via Deja.com http://www.deja.com/
Tue, 08 Jul 2003 20:53:54 GMT

markus244.. #3 / 5	C++ COM-Object with COM-Object as parameter Quote: > Hi, there. > It's easy - every COM interface is derived from IUnknown, so > just pass IUnknown* of any COM object and inside the interface > function do QueryInterface(....). BTW, don't forget AddRef() and > Release(). > Regards. > Sent via Deja.com > http://www.deja.com/ Thanks very much. I have to use the typ VARIANT because i need the COM-Object in a VBScript application. e.g. testmethod(VARIANT* objectVar) Do you know how to get out the IUnknown* - Interface out of objectVar? Markus Sent via Deja.com http://www.deja.com/
Fri, 11 Jul 2003 17:24:29 GMT

Andy Walldorf #4 / 5	C++ COM-Object with COM-Object as parameter IUnknown pUnk; if( objectVar.vt == VT_UNKNOWN ) pUnk = objectVar.punkVal; else if( objectVar.vt == VT_UNKOWN \| VT_BYREF ) pUnk = objectVar.ppunkVal; else cerr << "Not an IUnknown Object" Quote: > > Hi, there. > > It's easy - every COM interface is derived from IUnknown, so > > just pass IUnknown* of any COM object and inside the interface > > function do QueryInterface(....). BTW, don't forget AddRef() and > > Release(). > > Regards. > > Sent via Deja.com > > http://www.deja.com/ > Thanks very much. > I have to use the typ VARIANT because i need the COM-Object in a > VBScript application. > e.g. testmethod(VARIANT* objectVar) > Do you know how to get out the IUnknown* - Interface out of objectVar? > Markus > Sent via Deja.com > http://www.deja.com/
Fri, 11 Jul 2003 21:16:04 GMT

markus244.. #5 / 5	C++ COM-Object with COM-Object as parameter Quote: > IUnknown pUnk; > if( objectVar.vt == VT_UNKNOWN ) > pUnk = objectVar.punkVal; > else if( objectVar.vt == VT_UNKOWN \| VT_BYREF ) > pUnk = objectVar.ppunkVal; > else > cerr << "Not an IUnknown Object" Thanks yery much, i tried it and i works very fine in one way i made it to instantiate a com-object inside my c++ com-object-server and return it to VB-Script - Client ... works very well But i still have a problem: I have to return the object again to the server: e.g. <...> Set firstObject=CreateObject("Myfirst.first") Dim secondObject set secondObject = firstObject.someFunction(...) ' i return the secondObject from my C++ Server ' with variant-type VT_UNKNOWN set secondObject.testmethod(...) 'works fine firstObject.someMethod(secondObject) 'my C++ COM-Server gets the Object with VT_IDISPATCH set --> why ??? <...> Is there a problem if i ignore the VT_IDISPATCH Type and just handle it as normal VT_IUNKNOWN or do i have to do something like Invoke? Thanks Markus Sent via Deja.com http://www.deja.com/
Sun, 13 Jul 2003 05:46:04 GMT

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