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 system-exclusive data.
MM_MIM_LONGDATA wParam = (WPARAM) hInput lParam = (LPARAM) lpMidiHdr
Handle to the MIDI input device that received the data.
Pointer to 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.
** Windows NT/2000/XP:** Included in Windows NT 3.1 and later.
** Windows 95/98/Me:** Included in Windows 95 and later.
** Header:** Declared in Mmsystem.h; include Windows.h.