Re: CoCreateInstance function returns NULL

From:
"Heinz Ozwirk" <hozwirk.SPAM@arcor.de>
Newsgroups:
microsoft.public.vc.mfc
Date:
Wed, 17 May 2006 20:07:00 +0200
Message-ID:
<446b6645$0$11079$9b4e6d93@newsread4.arcor-online.net>
"nagar" <nagarpradeep@gmail.com> schrieb im Newsbeitrag =
news:1147879053.907059.71920@u72g2000cwu.googlegroups.com...

Hi All,
I'm trying to access some classes than an OLE server expose,
I know the CLSID of such classes because they are placed in Windows
Registry.
 
I use the :
STDAPI CoCreateInstance(
   REFCLSID rclsid, //Class identifier
   LPUNKNOWN pUnkOuter, //Object is or isn't part of an aggregate
   DWORD dwClsContext, //Context for running executable code
   REFIID riid, //Interface identifier
   LPVOID * ppv //Pointer to storage of interface pointer
  );
 
 
This is the program I use in Borland C++ 5 to instance a class
LPVOID ppv;
CLSID pclsidobjeto={0x12345678, 0x1234, =

0x1234,0x1234,0x123456789ABC}

CoCreateInstance(pclsidobjeto,NULL,CLSCTX_ALL,IID_IClassFactory,&ppv);
 
 
this function should return a pointer to an object of the class
instantiated
on ppv but it returns NULL.
 
 
AnyBody could tell me where is the error or if there is another way
to instance the class?


For a quick start, you could examine the return value of the function.

    Heinz

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