Public Const MMSYSERR_INVALHANDLE = (MMSYSERR_BASE + 5) ' device handle is invalid
Public Const MIDIERR_BASE = 64
Public Const MIDIERR_STILLPLAYING = (MIDIERR_BASE + 1) ' still something playing
Public Const MIDIERR_NOTREADY = (MIDIERR_BASE + 3) ' hardware is still busy
Public Const MIDIERR_BADOPENMODE = (MIDIERR_BASE + 6) ' operation unsupported w/ open mode
'User-defined variable the stores information about the MIDI output device.
Type MIDIOUTCAPS
wMid As Integer ' Manufacturer identifier of the device driver for the MIDI output device
' For a list of identifiers, see the Manufacturer Indentifier topic in the
' Multimedia Reference of the Platform SDK.
wPid As Integer ' Product Identifier Product of the MIDI output device. For a list of
' product identifiers, see the Product Identifiers topic in the Multimedia
' Reference of the Platform SDK.
vDriverVersion As Long ' Version number of the device driver for the MIDI output device.
' The high-order byte is the major version number, and the low-order byte is
' the minor version number.
szPname As String * MAXPNAMELEN ' Product name in a null-terminated string.
wTechnology As Integer ' One of the following that describes the MIDI output device:
' MOD_FMSYNTH-The device is an FM synthesizer.
' MOD_MAPPER-The device is the Microsoft MIDI mapper.
' MOD_MIDIPORT-The device is a MIDI hardware port.
' MOD_SQSYNTH-The device is a square wave synthesizer.
' MOD_SYNTH-The device is a synthesizer.
wVoices As Integer ' Number of voices supported by an internal synthesizer device. If the
' device is a port, this member is not meaningful and is set to 0.
wNotes As Integer ' Maximum number of simultaneous notes that can be played by an internal
' synthesizer device. If the device is a port, this member is not meaningful
' and is set to 0.
wChannelMask As Integer ' Channels that an internal synthesizer device responds to, where the least
' significant bit refers to channel 0 and the most significant bit to channel
' 15. Port devices that transmit on all channels set this member to 0xFFFF.
dwSupport As Long ' One of the following describes the optional functionality supported by
' the device:
' MIDICAPS_CACHE-Supports patch caching.
' MIDICAPS_LRVOLUME-Supports separate left and right volume control.
' MIDICAPS_STREAM-Provides direct support for the midiStreamOut function.
' MIDICAPS_VOLUME-Supports volume control.
'
' If a device supports volume changes, the MIDICAPS_VOLUME flag will be set
' for the dwSupport member. If a device supports separate volume changes on
' the left and right channels, both the MIDICAPS_VOLUME and the
' MIDICAPS_LRVOLUME flags will be set for this member.
End Type
Declare Function midiOutGetNumDevs Lib "winmm" () As Integer
' This function retrieves the number of MIDI output devices present in the system.
' The function returns the number of MIDI output devices. A zero return value means
' there are no MIDI devices in the system.
Declare Function midiOutGetDevCaps Lib "winmm.dll" Alias "midiOutGetDevCapsA" (ByVal uDeviceID As Long, lpCaps As MIDIOUTCAPS, ByVal uSize As Long) As Long
' This function queries a specified MIDI output device to determine its capabilities.
' The function requires the following parameters;
' uDeviceID- unsigned integer variable identifying of the MIDI output device. The
' device identifier specified by this parameter varies from zero to one
' less than the number of devices present. This parameter can also be a
' properly cast device handle.
' lpMidiOutCaps- address of a MIDIOUTCAPS structure. This structure is filled with
' information about the capabilities of the device.
' cbMidiOutCaps- the size, in bytes, of the MIDIOUTCAPS structure. Use the Len
' function with the MIDIOUTCAPS variable as the argument to get
' this value.
'
' The function returns MMSYSERR_NOERROR if successful or one of the following error values:
' MMSYSERR_BADDEVICEID The specified device identifier is out of range.
' MMSYSERR_INVALPARAM The specified pointer or structure is invalid.
' MMSYSERR_NODRIVER The driver is not installed.
' MMSYSERR_NOMEM The system is unable to load mapper string description.
Declare Function midiOutClose Lib "winmm.dll" (ByVal hMidiOut As Long) As Long
' The function closes the specified MIDI output device. The function requires a
' handle to the MIDI output device. If the function is successful, the handle is no
' longer valid after the call to this function. A successful function call returns
' MMSYSERR_NOERROR.
' A failure returns one of the following:
' MIDIERR_STILLPLAYING Buffers are still in the queue.
' MMSYSERR_INVALHANDLE The specified device handle is invalid.
' MMSYSERR_NOMEM The system is unable to load mapper string description.
Declare Function midiOutOpen Lib "winmm.dll" (lphMidiOut As Long, ByVal uDeviceID As Long, ByVal dwCallback As Long, ByVal dwInstance As Long, ByVal dwFlags As Long) As Long
' The function opens a MIDI output device for playback. The function requires the
' following parameters
' lphmo- Address of an HMIDIOUT handle. This location is filled with a
' handle identifying the opened MIDI output device. The handle
' is used to identify the device in calls to other MIDI output
' functions.
' uDeviceID- Identifier of the MIDI output device that is to be opened.
' dwCallback- Address of a callback function, an event handle, a thread
' identifier, or a handle of a window or thread called during
' MIDI playback to process messages related to the progress of
' the playback. If no callback is desired, set this value to 0.
' dwCallbackInstance- User instance data passed to the callback. Set this value to 0.
