&m_ulAdvise is passed to Advise(). For 64bit, it should not work.
This is a pointer. Assuming that m_ulAdvise is a DWORD variable then &m_ulAdvise is using the address-of operator which passes a pointer in the sample code. address-of-operator-amp
IConnectionPoint Advise 64bit
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(307.2, 63%, 39%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EMD%3C/text%3E%3C/svg%3E)
Mingyang Du
21
Reputation points
Hi there,
IConnectionPoint
HRESULT Advise(
[in] IUnknown *pUnkSink,
[out] DWORD *pdwCookie
);
[out] pdwCookie
A pointer to a returned token that uniquely identifies this connection.
We're porting our 32bit application to 64bit.
For 32bit application, there's no issue for pdwCookie as DWORD.
For 64bit, DWORD is not enough for 64bit pointer.
Any suggestion for this?
Thanks in advance,
Mingyang
Windows development | Windows API - Win32
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![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(179.20000000000002, 34%, 27%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EXY%3C/text%3E%3C/svg%3E)
Xiaopo Yang - MSFT 12,736 Reputation points Microsoft External Staff2021-12-15T09:25:53.683+00:00 For 64bit, DWORD is not enough for 64bit pointer.
What‘s mean?
The DWORD uniquely identifies a connection. pdwCookie is a pointer.
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Answer accepted by question author
RLWA32
52,571
Reputation points
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Mingyang Du 21 Reputation points
2021-12-16T04:57:19.07+00:00 Thanks a lot! I misunderstood the usage of pdwCookie
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1 additional answer
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RLWA32 52,571 Reputation points
2021-12-15T08:26:11.233+00:00 You are misinterpreting the code. pdwCookie is a pointer to a DWORD. So in 64 bit code pdwCookie is a 64 bit pointer to a 32 bit value.
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Mingyang Du 21 Reputation points
2021-12-15T08:51:42.083+00:00 Thanks for your reply.
Below is an example from above link.
&m_ulAdvise is passed to Advise(). For 64bit, it should not work.
HRESULT COperator::RegisterTapiEventInterface()
{
HRESULT hr = S_OK;
IConnectionPointContainer * pCPC;
IConnectionPoint * pCP;hr = m_pTapi->QueryInterface( IID_IConnectionPointContainer, (void **)&pCPC ); if ( SUCCEEDED( hr ) ) { hr = pCPC->FindConnectionPoint( IID_ITTAPIEventNotification, &pCP ); pCPC->Release(); } if ( SUCCEEDED( hr ) ) { hr = pCP->Advise( m_pTAPIEventNotification, ); pCP->Release(); } return hr;} /
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