midiStreamProperty function

The midiStreamProperty function sets or retrieves properties of a MIDI data stream associated with a MIDI output device.


MMRESULT midiStreamProperty(
  LPBYTE    lppropdata,
  DWORD     dwProperty



Handle to the MIDI device that the property is associated with.


Pointer to the property data.


Flags that specify the action to perform and identify the appropriate property of the MIDI data stream. The midiStreamProperty function requires setting two flags in each use. One flag (either MIDIPROP_GET or MIDIPROP_SET) specifies an action, and the other identifies a specific property to examine or edit.

Value Meaning
MIDIPROP_GET Retrieves the current setting of the given property.
MIDIPROP_SET Sets the given property.
MIDIPROP_TEMPO Retrieves the tempo property. The lppropdata parameter points to a MIDIPROPTEMPO structure. The current tempo value can be retrieved at any time. Output devices set the tempo by inserting MEVT_TEMPO events into the MIDI data.
MIDIPROP_TIMEDIV Specifies the time division property. You can get or set this property. The lppropdata parameter points to a MIDIPROPTIMEDIV structure. This property can be set only when the device is stopped.

Return Value

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

Return code Description
The specified handle is not a stream handle.
The given handle or flags parameter is invalid.


These properties are the default properties defined by the system. Driver writers can implement and document their own properties.


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

MIDI Functions