CoCreateInstance FAILED

Hi all,

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

In particular this piece of code:

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!

Quote:

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Originally Posted by marco.bernasconi

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

Code:

---

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

---

Quote:

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Originally Posted by Igor Vartanov

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

---

Thanks Igor,

The value is -2147221164.

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

Quote:

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Originally Posted by VictorN

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.

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.

Quote:

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Originally Posted by 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.

---

That's the trick!!!


:D

Thanks!!!

Quote:

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Originally Posted by marco.bernasconi

That's the trick!!!

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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.

Quote:

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Originally Posted by Igor Vartanov

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