This message is sent to a window when an input buffer has been filled with MIDI system-exclusive data and is being returned to the application.
WORD wParam
Specifies a handle to the MIDI input device that received the data.
LONG lParam
Specifies a far pointer to a MIDIHDR structure identifying the buffer.
None
The returned buffer may not be full. The dwBytesRecorded field of the MIDIHDR structure specified by lParam will specify the number of bytes recorded into the buffer.
No timestamp is available with this message. For timestamped input data, you must use the messages that are sent to low-level callback functions.
MM_MIM_DATA, MIM_LONGDATA