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Default Behavior of Drivers
In many situations, the MCI command specifications define the default values
and behavior for drivers of a particular device type. Since multimedia devices
can have a wide range of features (and limitations), there can be undefined
areas of behavior. Also, drivers might handle exceptions differently, based on the
capabilities of the device.
For example, consider the following commands sent to a waveform-audio driver:
mciSendString("open sound.wav alias sound", lpszReturnString,
lstrlen(lpszReturnString), NULL);
mciSendString("play sound notify", lpszReturnString,
lstrlen(lpszReturnString), NULL);
mciSendString("record sound from 0 notify", lpszReturnString,
lstrlen(lpszReturnString), NULL);
The record command returns a "Parameter out of range" value and stops the playback
started by the previous play command. One might expect the driver to validate the record command before stopping playback, but the driver stops the playback first.
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