About Device Handles

Each function that opens an audio device takes as parameters a device identifier, a pointer to a memory location, and some parameters unique to each type of device. The memory location is filled with a device handle. Use this device handle of identify the open audio device when calling other audio functions.

The distinction between audio-device identifiers and audio-device handles is subtle, but very important. Don't confuse the two in your application. The following are differences between device identifiers and device handles.

There are no functions for opening and closing auxiliary audio devices. Auxiliary audio devices don't need to be opened and closed like MIDI and waveform devices because there is no continuous data transfer associated with them. All auxiliary audio functions take device identifiers to identify devices.

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