midiStreamProperty

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
);

Parameters

hm

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

lppropdata

Address of the property data.

dwProperty

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:

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:

MMSYSERR_INVALHANDLE	The specified handle is not a stream handle.
MMSYSERR_INVALPARAM	The given handle or flags parameter is invalid.

Remarks

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

See Also

MIDIPROPTEMPO, MIDIPROPTIMEDIV

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