mixerGetDevCaps function (mmeapi.h)

The mixerGetDevCaps function queries a specified mixer device to determine its capabilities.


MMRESULT mixerGetDevCaps(
  UINT        uMxId,
  LPMIXERCAPS pmxcaps,
  UINT        cbmxcaps



Identifier or handle of an open mixer device.


Pointer to a MIXERCAPS structure that receives information about the capabilities of the device.


Size, in bytes, of the MIXERCAPS structure.

Return value

Returns MMSYSERR_NOERROR if successful or an error otherwise. Possible error values include the following.

Return code Description
The specified device identifier is out of range.
The mixer device handle is invalid.
One or more parameters are invalid.


Use the mixerGetNumDevs function to determine the number of mixer devices present in the system. The device identifier specified by uMxId varies from zero to one less than the number of mixer devices present.

Only the number of bytes (or less) of information specified in cbmxcaps is copied to the location pointed to by pmxcaps. If cbmxcaps is zero, nothing is copied, and the function returns successfully.

This function also accepts a mixer device handle returned by the mixerOpen function as the uMxId parameter. The application should cast the HMIXER handle to a UINT.


Minimum supported client Windows 2000 Professional [desktop apps only]
Minimum supported server Windows 2000 Server [desktop apps only]
Target Platform Windows
Header mmeapi.h (include Windows.h)
Library Winmm.lib
DLL Winmm.dll

See also

Audio Mixer Functions

Audio Mixers