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midiStreamProperty
The midiStreamProperty function sets or retrieves properties of a MIDI data stream associated with a
MIDI output device.
MMRESULT midiStreamProperty(
HMIDISTRM hm,
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| LPBYTE lppropdata,
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| DWORD dwProperty
|
| );
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|
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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