MM_WIM_DATA message

The MM_WIM_DATA message is sent to a window when waveform-audio data is present in the input buffer and the buffer is being returned to the application. The message can be sent either when the buffer is full or after the waveInReset function is called.

wParam = (WPARAM) hInputDev 
lParam = (LONG) lpwvhdr 



Handle to the waveform-audio input device that received the data.


Pointer to a WAVEHDR structure that identifies the buffer containing the data.

Return Value

This message does not return a value.


The returned buffer might not be full. Use the dwBytesRecorded member of the WAVEHDR structure specified by lParam to determine the number of bytes recorded into the returned buffer.


Requirement Value
Minimum supported client
Windows 2000 Professional [desktop apps only]
Minimum supported server
Windows 2000 Server [desktop apps only]
Mmsystem.h (include Windows.h)

See also

Waveform Audio

Waveform Messages