Re: Passing SAFEARRAY of SHORTs in event causes EEMessageException

From:
"Igor Tandetnik" <itandetnik@mvps.org>
Newsgroups:
microsoft.public.vc.atl
Date:
Thu, 29 Nov 2007 13:05:20 -0500
Message-ID:
<Ob2yoJrMIHA.280@TK2MSFTNGP03.phx.gbl>
Bjoern <bjoern.d.rasmussen@gmail.com> wrote:

HRESULT Fire_OnUserAudioData( LONG nUserID, LONG nSampleRate,
SAFEARRAY* pRawAudio, LONG nSamples)
{
HRESULT hr = S_OK;
T * pThis = static_cast<T *>(this);
int cConnections = m_vec.GetSize();
for (int iConnection = 0; iConnection < cConnections; iConnection++)
{
pThis->Lock();
CComPtr<IUnknown> punkConnection = m_vec.GetAt(iConnection);
pThis->Unlock();
IDispatch * pConnection = static_cast<IDispatch
*>(punkConnection.p);
if (pConnection)
{
CComVariant avarParams[4];
avarParams[3] = nUserID;
avarParams[3].vt = VT_I4;
avarParams[2] = nSampleRate;
avarParams[2].vt = VT_I4;
avarParams[1] = pRawAudio;


You never set avarParams[1].vt, so it retains its default value of
VT_EMPTY. Set it to VT_I2 | VT_ARRAY

I've also noticed in the above code that avarParams[1] isn't assigned
a type. I've tried to set the type to (VT_I2 | VT_SAFEARRAY) but it
didn't change anything. It still throws the EEMessageException.


It's VT_ARRAY, not VT_SAFEARRAY
--
With best wishes,
    Igor Tandetnik

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