Re: CoCreateInstance bad variable type

"Igor Tandetnik" <>
Thu, 24 May 2007 07:53:50 -0400
"Sue" <> wrote in message

On May 23, 7:53 pm, "Igor Tandetnik" <> wrote:

"Sue" <> wrote in message

I was trying to use CoCreateInstance and get a return result "bad
variable type". can anyone tell me what could be the cause of it?
How do I know if the COM component is registered OK? Thanks.

IHandler* pI;
HRESULT hr = CoCreateInstance(CLSID_Handler, NULL,
CLSCTX_INPROC_SERVER, IID_IHandler, (void**)&pI);

You are probably misinterpreting the HRESULT. What is the exact
numeric value you get from CoCreateInstance?


This is indeed DISP_E_BADVARTYPE. I'm not sure why it would be returned
from CoCreateInstance. But see

The poster there seems to have the same problem, and it was likely
caused by adding non-automation-compatible method to an automation

How is IHandler defined in the IDL? Do you get any warnings from MIDL
when this IDL file is compiled?
With best wishes,
    Igor Tandetnik

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