Windows Dev Center

Collapse the table of content
Expand the table of content
Expand Minimize
The topic you requested is included in another documentation set. For convenience, it's displayed below. Choose Switch to see the topic in its original location.

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.


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



Community Additions

© 2015 Microsoft