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MM_MIM_MOREDATA
The MM_MIM_MOREDATA message is sent to a callback window when a MIDI message
is received by a MIDI input device but the application is not processing MIM_DATA messages fast enough to keep up with the input device driver. The window
receives this message only when the application specifies MIDI_IO_STATUS in the
call to the midiInOpen function.
MM_MIM_MOREDATA
wParam = (WPARAM) hInput
lParam = (LPARAM) (DWORD) lMidiMessage
Parameters
hInput
Handle of the MIDI input device that received the MIDI message.
lMidiMessage
Specifies the MIDI message that was received. The message is packed into a
doubleword value as follows:
High word
| High-order byte
| Not used.
|
| Low-order byte
| Contains a second byte of MIDI data (when needed).
| Low word
| High-order byte
| Contains the first byte of MIDI data (when needed).
|
| Low-order byte
| Contains the MIDI status.
|
The two MIDI data bytes are optional, depending on the MIDI status byte.
Return Values
This message does not return a value.
Remarks
If your application will receive MIDI data faster than it can process it, you
should not use a window callback mechanism. To maximize speed, use a callback
function, and use the MIM_MOREDATA message instead of MM_MIM_MOREDATA.
An application should do only a minimal amount of processing of
MM_MIM_MOREDATA messages. (In particular, applications should not call the PostMessage function while processing MM_MIM_MOREDATA.) Instead, the application should
place the event data into a buffer and then return.
When an application receives an MM_MIM_DATA message after a series of MM_MIM_MOREDATA messages, it has caught up with
incoming MIDI events and can safely call time-intensive functions.
MIDI messages received from a MIDI input port have running status disabled;
each message is expanded to include the MIDI status byte.
This message is not sent when a MIDI system-exclusive message is received. No
time stamp is available with this message. For time-stamped input data, you
must use the messages that are sent to callback functions.
See Also
midiInOpen, MIM_DATA, MIM_MOREDATA, MM_MIM_DATA, PostMessage
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