COGetClassObject and 0x80004002 (No such interface supported)   

Hi,

In one process I'm calling CoRegisterClassObject(clsid, svcptr, 
CLSCTX_LOCAL_SERVER, REGCLS_MULTIPLEUSE, &somecookie). The pointer that I 
pass to CoRegisterClassObject implements custom IDispatch derived interface. 
As such, the implementation responds properly to QI for IID_IUnknown and 
IID_IDispatch. For everything else it returns E_NOINTERFACE. 
CoRegisterClassObject returns S_OK.

Now, I have a 2nd process which calls CoGetClassObject(clsid, 
CLSCTX_LOCAL_SERVER, 0, IID_IDispatch, svcptr).

This works in 99% of cases\machines (win9x,NT4,win2k+). However, sometimes 
CoGetClassObject fails with 0x80004002 (No such interface supported) in 2nd 
process.

Does anyone see what's wrong in the above scheme? Should I only ask for 
IClassFactory in CoGetClassObject? I don't think that's a requirement. The 
CLSID value used in failed case was: dc9745ec-7861-42f9-9896-e83516ff3cc6. 
It doesn't seem to overlap with anything. I generate new value dynamically 
through CoCreateGUID for process lifetime.

Thank you for any help on this!

date: Tue, 13 Dec 2005 21:59:33 -0500   author:   Leon Finker am