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

MMRESULT midiStreamProperty(
  HMIDISTRM hm,       
  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 Values

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

Value Description
MMSYSERR_INVALHANDLE The specified handle is not a stream handle.
MMSYSERR_INVALPARAM 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.


  Windows NT/2000/XP: Included in Windows NT 3.1 and later.
  Windows 95/98/Me: Included in Windows 95 and later.
  Header: Declared in Mmsystem.h; include Windows.h.
  Library: Use Winmm.lib.

See Also

Musical Instrument Digital Interface (MIDI), MIDI Functions, MIDIPROPTEMPO, MIDIPROPTIMEDIV