Re: dllregisterserver not registering com classes

From:

Stuart Redmann <DerTopper@web.de>

Newsgroups:

microsoft.public.vc.language

Date:

Thu, 20 Jul 2006 09:26:36 +0200

Message-ID:

<e9nei3$56f$1@news.dtag.de>

>> PaulH wrote:
>>
>>> I have a COM DLL (created with the ATL COM wizard). It comes with
>>> the function:
>>>
>>> // DllRegisterServer - Adds entries to the system registry
>>> STDAPI DllRegisterServer(void)
>>> {
>>> // registers object, typelib and all interfaces in typelib
>>> HRESULT hr = _AtlModule.DllRegisterServer();
>>> return hr;
>>> }
>>>
>>> This function does get called when the object is registered, but
>>> none of the interfaces I have defined get registered.
>>> Do I need to put code in to manually register my objects? What does
>>> that function register, then?

[snipped suggestion that he may have forgotten to put the class id in
the OBJECT_MAP]

I don't have any BEGIN_OBJECT_MAP entries, but I think as of VC7, ATL
switched to using OBJECT_ENTRY_AUTO() macros instead. I'm using VS
2005, if that helps.

I do have an OBJECT_ENTRY_AUTO() macro at the bottom of my
wizard-generated IMyModule.h

OBJECT_ENTRY_AUTO(__uuidof(IMyModule), CIMyModule)

as well as a COM_MAP entry in my CIMyModule() class

    DECLARE_REGISTRY_RESOURCEID(IDR_IMYMODULE)

    BEGIN_COM_MAP(CIMyModule)
        COM_INTERFACE_ENTRY(IIMyModule)
        COM_INTERFACE_ENTRY2(IDispatch, IComponentRegistrar)
        COM_INTERFACE_ENTRY(IComponentRegistrar)
    END_COM_MAP()

I wasn't entirely correct before, though. The interface is being
properly put in to the registry, it's only that when I try to access
it, I get the REGDB_E_CLASSNOTREG error from:

This is getting a bit confusing. As I see it you have a class called
IMyModule that exposes an interface IIMyModule. That means I suspect you
have something like the following lines in your .idl file:

[
   ...
]
interface IIModule : ...

[
   ...
]
coclass IMyModule
{
   ...
};

This naming sceme is quite confusing, since one should only use the
prefix 'I' for interface names. You idl-file should read something like
that:
[...] interface IModule : ... {...};
[...] coclass MyModule {...};

When you say that your _interface_ is properly registered in the
registry, you certainly means that your _coclass_ is properly registered.

{
    //...
    MyModuleLib::IIMyModulePtr pModule = NULL;
    HRESULT hr = pModule.CreateInstance(TEXT("MyModule.IMyModule"));
    //...
}

Have you tried to create an instance of your coclass by class id? Under
VC6.0 this can be done by simply calling CreateInstance for a given
smart pointer without any arguments:
HRESULT hr = pModule.CreateInstance ();

Regards,
Stuart