This message is sent to waveform input device drivers to stop waveform recording and return all buffers in the input queue to the client.
DWORD dwParam1
Unused.
DWORD dwParam2
Unused.
The return value is an error code, or zero (MMSYSERR_NOERROR) if the operation is successful. Possible error codes are:
MMSYSERR_NOTENABLED
The driver failed to load or initialize.
The driver should stop recording even if in the paused state. It should set the WHDR_DONE bit and clear the WHDR_INQUEUE bit in the dwFlags field of the WAVEHDR structure for each buffer in the input queue. It should also be sure the dwBytesRecorded field contains the number of bytes recorded for each buffer and reset the position count to zero. The driver should then notify the client by using DriverCallback to send a WOM_DONE message for each buffer.