Opening and Closing Device Drivers
You must open a MIDI device before using it, and you should close the device
as soon as you finish using it. Windows provides the following functions to open
and close different types of MIDI devices:
Each function that opens a MIDI device takes as parameters a device
identifier, an address of a memory location, and some parameters unique to MIDI devices.
The memory location is filled with a device handle, which is used to identify
the open audio device in calls to other audio functions.
Many MIDI functions can accept either a device handle or a device identifier.
Although you can use a device handle wherever you would use a device
identifier, you cannot always use a device identifier when a handle is called for.
MIDI devices are not necessarily shareable, so a particular device may not
be available when a user requests it. If this happens, the application should
notify the user and allow the user to try to open the device again.
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