waveInProc callback function

The waveInProc function is the callback function used with the waveform-audio input device. This function is a placeholder for the application-defined function name. The address of this function can be specified in the callback-address parameter of the waveInOpen function.

Syntax

void CALLBACK waveInProc(
   HWAVEIN   hwi,
   UINT      uMsg,
   DWORD_PTR dwInstance,
   DWORD_PTR dwParam1,
   DWORD_PTR dwParam2
);

Parameters

• hwi
  Handle to the waveform-audio device associated with the callback function.

• uMsg
  Waveform-audio input message. It can be one of the following messages.

  Value	Meaning
  WIM_CLOSE	Sent when the device is closed using the waveInClose function.
  WIM_DATA	Sent when the device driver is finished with a data block sent using the waveInAddBuffer function.
  WIM_OPEN	Sent when the device is opened using the waveInOpen function.

   

• dwInstance
  User instance data specified with waveInOpen.

• dwParam1
  Message parameter.

• dwParam2
  Message parameter.

Return value

This function does not return a value.

Remarks

Applications should not call any system-defined functions from inside a callback function, except for EnterCriticalSection, LeaveCriticalSection, midiOutLongMsg, midiOutShortMsg, OutputDebugString, PostMessage, PostThreadMessage, SetEvent, timeGetSystemTime, timeGetTime, timeKillEvent, and timeSetEvent. Calling other wave functions will cause deadlock.

Requirements

See also

Waveform Audio

Waveform Functions