midiStreamProperty function

Articolo
06/06/2016

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

Syntax

MMRESULT midiStreamProperty(
   HMIDISTRM hm,
   LPBYTE    lppropdata,
   DWORD     dwProperty
);

Parameters

hm
Handle to the MIDI device that the property is associated with.
lppropdata
Pointer to 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.

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
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.

Requirements

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

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