#MICROSOFT MIDI MAPPER FAILED WINDOWS 10 CODE#
To correct the code in the posted question, two of the lines of code could be changed to the following: header.dwBufferLength = sizeof( *event ) - sizeof( event->dwParms ) It turns out that the fourth member of the structure, dwParms, should actually be omitted from short messages. The problem was that I was using the entire event structure as the buffer for the MIDI stream. MidiStreamOut( midi, &header, sizeof( header ) ) MidiOutPrepareHeader( ( HMIDIOUT )midi, &header, sizeof( header ) ) Header.dwBytesRecorded = sizeof( *event ) Header.dwBufferLength = sizeof( *event ) Here is the code to send the MIDI message: MIDIHDR header Įvent = ( MIDIEVENT * )malloc( sizeof( *event ) ) Įvent->dwEvent = ( MEVT_F_SHORT | MEVT_SHORTMSG ) << 24 | ( msg & 0x00FFFFFF ) MidiStreamOpen( &midi, &device_id, 1, ( DWORD_PTR )hwnd, 0, CALLBACK_WINDOW ) Here is the code to open the MIDI stream: UINT device_id = MIDI_MAPPER //Also tried 0, 1, 2 and 3 I am using Windows 7 (64-bit) and have tried opening the MIDI stream with device IDs of both MIDI_MAPPER and all four MIDI output devices on my system, and still receive the exact same error message. The current MIDI Mapper setup refers to a MIDI device that is not installed on the system. midiOutGetErrorText gives the following description of the error:
However, midiStreamOut always returns error code 68, which is #defined to MCIERR_WAVE_OUTPUTUNSPECIFIED. If I use midiOutShortMsg to send a non-queued MIDI message to the stream, it works correctly. I'm writing a Windows program using C++ and the Windows API, and, am trying to queue MIDI messages in a MIDI stream, but am receiving a strange error when I try to do so.
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