The MM_MIM_LONGDATA message is sent to a window when either a complete MIDI
system-exclusive message is received or when a buffer has been filled with
wParam = (WPARAM) hInput
lParam = (LPARAM) lpMidiHdr
Handle of the MIDI input device that received the data.
Address of a MIDIHDR
structure identifying the buffer.
This message does not return a value.
The returned buffer might not be full. To determine the number of bytes
recorded into the returned buffer, use the dwBytesRecorded
member of the MIDIHDR
structure pointed to by lpMidiHdr
No time stamp is available with this message. For time-stamped input data, you
must use the messages that are sent to callback functions.
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