CoCreateInstance FAILED

[marco.bernasconi]

Hi all,

I'm following a sample from a third part SDK.

In particular this piece of code:

CComPtr<INVRAdapter> _adapter;

CLSID clsOCAdapter;
HRESULT hr1 = CLSIDFromProgID(L"OnSSI.OCAdapter.1", &clsOCAdapter);

HRESULT hr2 = CoCreateInstance(clsOCAdapter,
		NULL,
		CLSCTX_INPROC_SERVER,
		__uuidof(INVRAdapter),
		(void**)&_adapter);

if (FAILED(hr2))
{
//code
}

The result is that hr2 is negative, so it fails.

I've checked in the registry and the OnSSI.OCAdapter.1 record exists.


What's the problem?

Thank you very much!

[Igor Vartanov]

What's the problem?

The problem can be understood from hr2 exact value, which you did not provide on some reason.

Most probably you do not initialize COM on the thread.

Besides, as long as you deal with CComPtr, your code might look just like

CComPtr<INVRAdapter> _adapter;
HRESULT hr = _adapter.CoCreateInstance(L"OnSSI.OCAdapter");

[marco.bernasconi]

The problem can be understood from hr2 exact value, which you did not provide on some reason.

Thanks Igor,

The value is -2147221164.

[VictorN]

It is REGDB_E_CLASSNOTREG (hex value 0x80040154):
Class not registered

[marco.bernasconi]

It is REGDB_E_CLASSNOTREG (hex value 0x80040154):
Class not registered

Mmmh...in the registry (HKEY_LOCAL_MACHINE/SOFTWARE/Classes) I see OnSSI.OCAdapter.1.

I've registered it using regasm.

[OReubens]

If it's in-process... Are you sure the bitness of your app is the same as the bitness of your registered COM object ?

you can't call a 64bit in-process COM object from a 32bit app and vice versa.

[marco.bernasconi]

If it's in-process... Are you sure the bitness of your app is the same as the bitness of your registered COM object ?

you can't call a 64bit in-process COM object from a 32bit app and vice versa.

That's the trick!!!




Thanks!!!

[Igor Vartanov]

That's the trick!!!

What's the trick? HRESULT never lies. In case it says Class not registered, the class is not registered. 64-bit and 32-bit processes have different registry hives for COM class registration.

[marco.bernasconi]

What's the trick? HRESULT never lies. In case it says Class not registered, the class is not registered. 64-bit and 32-bit processes have different registry hives for COM class registration.

I didn't know that there are different registries for COM class.

I'm not a guru in this field

Thanks for all!

Marco