IRunningObjectTable::GetObject return a error

Question

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

Answer 1

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

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

Answer 2

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

Answer 3

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