Querying MIDI Devices
Before playing or recording MIDI data, you must determine the capabilities of
the MIDI hardware present in the system. MIDI capability can vary from one
multimedia computer to the next; applications should not make assumptions about the
hardware present in a given system.
Windows provides the following functions to determine how many MIDI devices
are available for input or output in a given system:
||Retrieves the number of MIDI input devices present in the system.
||Retrieves the number of MIDI output devices present in the system.
Like other audio devices, MIDI devices are identified by a device identifier,
which is determined implicitly from the number of devices present in a given
system. Device identifiers range from zero to the number of devices present,
minus one. For example, if there are two MIDI output devices in a system, valid
device identifiers are 0 and 1.
After you determine how many MIDI input or output devices are present in a
system, you can inquire about the capabilities of each device. Windows provides
the following functions to determine the capabilities of audio devices:
Each of these functions has a parameter specifying the address of a structure
that the function fills with information about the capabilities of a specified
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