DLL2 should implement interface defined in DLL1 - how?
- From: Axel Bock <axel.bock.news@xxxxxxxxxxxxxx>
- Date: Tue, 10 Jul 2007 04:39:28 -0700
Hi list,
I have this VERY annoying thing at my hands. I don't know COM too
much, so please forgive me if that's something every noob should
know.
So.
I have two DLL's with COM components. DLL one defines an interface
IMyInterface. I know want to have a 2nd DLL to have a class which
implements that interface, too.
The IDL of the second DLL looks like this:
[
object,
uuid(982F014C-579C-464E-BA9E-584419041811),
dual,
nonextensible,
helpstring("IMyOtherInterface-Schnittstelle"),
pointer_default(unique)
]
interface IMyOtherInterface : IDispatch{
};
[
uuid(A10B957D-305F-401A-B12F-58EE7D192F66),
version(1.0),
]
library MySecondDLLLibrary
{
importlib("stdole2.tlb");
importlib("../myfirstproject/Debug/firstDLL.tlb");
[
uuid(0AC402BF-7310-4C56-8E29-48EAF9D5BA76),
helpstring("MyOtherInterface Class")
]
coclass MyOtherInterface
{
[default] interface IMyOtherInterface;
interface IMyInterface;
};
};
Now that compiles just fine. I also checked with some MS DLLs in the
Windows directory, they look just the same.
The problem is now that I don't know how to do this on C++ level. What
I did until now was:
- I added the IDL files from the IMyInterface to the 2nd project
- I compiled the 2nd project without any modifications - works.
- I checked the code, the code looks like this:
// ADDED BY ME
#include "IMyInterfaceProject.idl"
// THE REST IS WIZARD CODE
// CMyOtherInterface
class ATL_NO_VTABLE CMyOtherInterface :
public CComObjectRootEx<CComSingleThreadModel>,
// TRIED TO ADD THE NEXT LINE
// public IMyInterface,
public CComCoClass<CMyOtherInterface,
&CLSID_MyOtherInterface>,
public IDispatchImpl<IMyOtherInterface,
&IID_IMyOtherInterface, &LIBID_Icw_Sdk_Module_Configuration_C, /
*wMajor =*/ 1, /*wMinor =*/ 0>
{
public:
CMyOtherInterface()
{
}
DECLARE_REGISTRY_RESOURCEID(IDR_MyOtherInterface)
DECLARE_NOT_AGGREGATABLE(CMyOtherInterface)
BEGIN_COM_MAP(CMyOtherInterface)
COM_INTERFACE_ENTRY(IMyOtherInterface)
// TRIED TO ADD THE NEXT LINE
// COM_INTERFACE_ENTRY(IMyInterface)
COM_INTERFACE_ENTRY(IDispatch)
END_COM_MAP()
DECLARE_PROTECT_FINAL_CONSTRUCT()
HRESULT FinalConstruct()
{
return S_OK;
}
void FinalRelease()
{
}
public:
};
OBJECT_ENTRY_AUTO(__uuidof(MyOtherInterface),
CMyOtherInterface)
Well. This is all fine, VS-wizard-generated code. But I missed the
references to IMyInterface, so I tried including them into the header
(the commented out lines). I also found an article in the internet
saying exactly that: http://vcfaq.mvps.org/com/7.htm .
Alas as soon as I include references to IMyInterface in the
inheritance chain, I get the following compiler error:
c:\.....\myotherinterface.h (36) : error C2594: 'static_cast' :
ambiguous conversions from 'CMyOtherInterface::_ComMapClass *' to
'IDispatch *'
I CAN import the IDL files into the 2nd project, but if I do that I
cannot use both at the same time from a third one - both will export
the IMyInterface definition, and the stub compiler - rightfully -
complains about redefinition, and I guess this is not the right way to
go. A look with OLEView at for example SRCHADM.DLL and MSSITLB.IDL
shows that this HAS to be possible :-) . But I only don't know
how ...
Any ideas? Anyone? :-) ? I hope this was enough information to get the
idea across.
Greetings & thanks,
Axel.
.
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