IRunningObjectTable::GetObject return a error

Mon, 07 Jul 2008 04:09:19 Z

Hi,
When I use RunningObjectTable, there is a puzzling error. Why I can't get a right pointer by IRunningObjectTable::GetObject.

Here is the test code:

int main(int argc, char* argv[])
{
CoInitialize(NULL);

    {
        CComPtr<IHello> ptr;
        ptr.CoCreateInstance(CLSID_Hello);

ptr->Hello(); // I can InternalAddRef() in this function.
} // So, when ptr is auto released, the object in COM server end will not be desstructed.

    {
        HRESULT hr = S_OK;
        IRunningObjectTable* pROT = NULL;

        const WCHAR szDelim[2] = L"!";
        IMoniker*   pmkService = NULL;

        CComBSTR    bstrMkItemName("12345678");

        hr = CreateItemMoniker( szDelim, bstrMkItemName, &pmkService );
        if( FAILED( hr ) )
        {
            return hr;
        }


        hr = GetRunningObjectTable( 0, &pROT );
        if( FAILED( hr ) )
        {
            return hr;
        }


        IUnknown* pUnk;
        pROT->GetObject(pmkService, &pUnk);          // after this line, why pUnk = NULL?

IHello* iptr;
pUnk->QueryInterface(&iptr);

iptr->Hello();
}

return 0;
}

The code in COM server end:

STDMETHODIMP CHello::Hello()
{
MessageBox(NULL, "Hello", "", MB_OK);

HRESULT hr = S_OK;
IRunningObjectTable* pROT = NULL;

const WCHAR szDelim[2] = L"!";
IMoniker* pmkService = NULL;

CComBSTR bstrMkItemName("12345678");

hr = CreateItemMoniker( szDelim, bstrMkItemName, &pmkService );
if( FAILED( hr ) )
{
return hr;
}

hr = GetRunningObjectTable( 0, &pROT );
if( FAILED( hr ) )
{
return hr;
}

hr = pROT->Register(0, this, pmkService, &m_dwRegister);

this->InternalAddRef();
return S_OK;
}

thanks.
liixixi

IRunningObjectTable::GetObject return a error

Mon, 07 Jul 2008 18:13:10 Z

What is the value of HRESULT returned by GetObject()?

Is the COM Server a DLL, a DCOM executable or a DCOM service?

IRunningObjectTable::GetObject return a error

Tue, 08 Jul 2008 03:15:40 Z

The problem has reseloved, it should use ROTFLAGS_REGISTRATIONKEEPSALIVE to register the object to ROT.

IRunningObjectTable::GetObject return a error

Tue, 08 Jul 2008 05:06:22 Z

Out of curiosity, did the HRESULT value returned by GetObject() help you deduce the problem?