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waveOutOpen () callback function problem

yragael
yragael asked
on
1,992 Views
Last Modified: 2008-03-17
I can't set the callback function for the waveOutOpen () windows API call. Here is my callback function:

procedure Callback (hWave: HWAVEOUT; uMsg: UINT; dwInstance:DWORD; dwParam1:DWORD; dwParam2: DWORD);
begin
  if (uMsg = MM_WOM_DONE) then
    Application.MessageBox ('done',done',mb_Ok);
end;


and here is my waveOutOpen () system call:

waveOutOpen (@AHWaveOut,
             wCount,
             @AWaveFormatEx,
             DWORD (@Callback),
             0,
             CALLBACK_FUNCTION);

This works fine without callback function. Why doesn't this work with this callback function ? The system crashes or tells me about an illegal read...

Help !
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