The MM_MIM_LONGERROR message is sent to a window when an invalid or incomplete MIDI system-exclusive message is received.
MM_MIM_LONGERROR
wParam = (WPARAM) hInput
lParam = (LPARAM) lpMidiHdr
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 specified by lpMidiHdr.
Windows NT: Requires version 3.1 or later.
Windows: Requires Windows 95 or later.
Windows CE: Unsupported.
Header: Declared in mmsystem.h.
Musical Instrument Digital Interface (MIDI) Overview, MIDI Messages, MIDIHDR