MIDIOUTCAPS

The MIDIOUTCAPS structure describes the capabilities of a MIDI output device.

typedef struct { 
    WORD      wMid; 
    WORD      wPid; 
    MMVERSION vDriverVersion; 
    CHAR      szPname[MAXPNAMELEN]; 
    WORD      wTechnology; 
    WORD      wVoices; 
    WORD      wNotes; 
    WORD      wChannelMask; 
    DWORD     dwSupport; 
} MIDIOUTCAPS;

Members

wMid

Manufacturer identifier of the device driver for the MIDI output device. Manufacturer identifiers are defined in Manufacturer and Product Identifiers.

wPid

Product identifier of the MIDI output device. Product identifiers are defined in Manufacturer and Product Identifiers.

vDriverVersion

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

Product name in a null-terminated string.

wTechnology

Flags describing the type of the MIDI output device. It can be one of the following:

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

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

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

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

Optional functionality supported by the device. It can be one or more of the following:

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.

QuickInfo

  Windows NT: Requires version 3.1 or later.
  Windows: Requires Windows 95 or later.
  Windows CE: Unsupported.
  Header: Declared in mmsystem.h.
  Unicode: Defined as Unicode and ANSI structures.

MIDIOUTCAPS

Members

QuickInfo

See Also