Re: COM Server Registration

From:

"Alexander Nickolov" <agnickolov@mvps.org>

Newsgroups:

microsoft.public.vc.atl

Date:

Wed, 26 Sep 2007 16:45:09 -0700

Message-ID:

<OM1BwcJAIHA.748@TK2MSFTNGP04.phx.gbl>

Well, the last thing I can think of is that you don't have
permissions to access the DLL where your COM object
resides. Try copying it in a shared location and registering
it there.

Well, one more wild guess is you might be running a 64-bit
client and the DLL is only registered for 32-bit...

If you don't see your DLL loading I suppose the problem
can't be that you haven't exported the class factory from
DllGetClassObject. And marshaling only kicks in later
during IClassFactory::CreateInstance, so that shouldn't
be a problem either.

--
=====================================
Alexander Nickolov
Microsoft MVP [VC], MCSD
email: agnickolov@mvps.org
MVP VC FAQ: http://vcfaq.mvps.org
=====================================

"Lamefif" <Leonardo.Pjetri@googlemail.com> wrote in message
news:1190795205.621759.121470@19g2000hsx.googlegroups.com...

On Sep 25, 6:55 pm, "Alexander Nickolov" <agnicko...@mvps.org> wrote:

Can you check if the DLL of your COM object is loaded
upon the crash? See the list of modules for the process in
the debugger.

--
=====================================
Alexander Nickolov
Microsoft MVP [VC], MCSD
email: agnicko...@mvps.org
MVP VC FAQ:http://vcfaq.mvps.org
=====================================

"Lamefif" <Leonardo.Pje...@googlemail.com> wrote in message

news:1190666174.251967.259670@r29g2000hsg.googlegroups.com...

On Sep 24, 8:07 pm, "Alexander Nickolov" <agnicko...@mvps.org> wrote:

Are you sure it's CoGetClassObject that fails and not
IClassFactory::CreateInstance? You don't seem to be
checking errors in your code...

--
=====================================
Alexander Nickolov
Microsoft MVP [VC], MCSD
email: agnicko...@mvps.org
MVP VC FAQ:http://vcfaq.mvps.org
=====================================

"Lamefif" <Leonardo.Pje...@googlemail.com> wrote in message

news:1190412251.715325.207940@50g2000hsm.googlegroups.com...

On Sep 21, 9:25 pm, "Alexander Nickolov" <agnicko...@mvps.org>
wrote:

Make sure the CLSID in your code matches the CLSID in
your registration script.

--
=====================================
Alexander Nickolov
Microsoft MVP [VC], MCSD
email: agnicko...@mvps.org
MVP VC FAQ:http://vcfaq.mvps.org
=====================================

"Lamefif" <Leonardo.Pje...@googlemail.com> wrote in message

news:1190404670.848755.259250@g4g2000hsf.googlegroups.com...

hi, im reading this book on com and need some help with the
examples.
i have compiled the server, and to register it i have
written a .reg file as instructed.
-----.reg file--
REGEDIT
HKEY_CLASSES_ROOT\CarInProcServer.CoCar\CLSID =
{6F0BA608-CDA6-44ba-
AC80-F2B31B8A496C}
HKEY_CLASSES_ROOT\CLSID\{6F0BA608-CDA6-44ba-AC80-F2B31B8A496C} =
CarInProcServer.CoCar
\InprocServer32 = C:\Documents and Settings\Leonardo\My Documents
\Visual Studio
2005\Projects\CarInProcServer\Debug\CarInProcServer.dll
------
when run the file above works, it adds to registry the server.

hr = CoGetClassObject(CLSID_CoCar, CLSCTX_INPROC_SERVER,
                        NULL, IID_IClassFactory, (void**)&pCF);
here however CovetClassObject returns a "Class not registered"
and i
get access violation at run time.

--client---
int main()
{
CoInitialize(NULL);
    HRESULT hr = NULL;
    IClassFactory* pCF = NULL;
    ICreateCar* pICreateCar = NULL;
    IStats* pStats = NULL;
    IEngine* pEngine = NULL;
// Get the class factory pointer of CoCar.
    hr = CoGetClassObject(CLSID_CoCar, CLSCTX_INPROC_SERVER,
                        NULL, IID_IClassFactory, (void**)&pCF);
      // Make a CoCar & get ICreateCar.
    hr = pCF->CreateInstance(NULL, IID_ICreateCar,
(void**)&pICreateCar);
........

thanks

i have double checked that and i think im using the right one:

// {CB430D57-73BA-46d8-B749-8317D93CEA23}
DEFINE_GUID(IID_IEngine,
0xcb430d57, 0x73ba, 0x46d8, 0xb7, 0x49, 0x83, 0x17, 0xd9, 0x3c,
0xea,
0x23);

// {C0DE508D-CE8F-4991-967F-B3E396C11E07}
DEFINE_GUID(IID_IStats,
0xc0de508d, 0xce8f, 0x4991, 0x96, 0x7f, 0xb3, 0xe3, 0x96, 0xc1,
0x1e,
0x7);

// {E0173D16-2397-43f9-9E25-301F7C0B93F6}
DEFINE_GUID(IID_ICreateCar,
0xe0173d16, 0x2397, 0x43f9, 0x9e, 0x25, 0x30, 0x1f, 0x7c, 0xb, 0x93,
0xf6);

// {6F0BA608-CDA6-44ba-AC80-F2B31B8A496C}
DEFINE_GUID(CLSID_CoCar,
0x6f0ba608, 0xcda6, 0x44ba, 0xac, 0x80, 0xf2, 0xb3, 0x1b, 0x8a,
0x49,
0x6c);

im using the last one CLSID_CoCar..

i cant see where im going wrong :(

thanks

eloview.exe gives me on create instance:

CoGetClassObject failed.
Class not registered
REGDB_E_CLASSNOTREG ($80040154)

   hr = CoGetClassObject(CLSID_CoCar, CLSCTX_INPROC_SERVER,
                        NULL, IID_IClassFactory, (void**)&pCF);
      // Make a CoCar & get ICreateCar.
    hr = pCF->CreateInstance(NULL, IID_ICreateCar,
(void**)&pICreateCar); <-- the program breaks here with access
violation

-2147221164 <--hr value

nope is not loaded.