Closing a Device
) command releases access to a device or file. MCI frees a device when all
tasks using a device have closed it. To help MCI manage the devices, your
application must close each device or file when it is finished using it.
When you close an external MCI device that uses its own media instead of files
(such as CD audio), the driver leaves the device in its current mode of
operation. Thus, if you close a CD audio device that is playing, even though the
device driver is released from memory, the CD audio device will continue to play
until it reaches the end of its content.
Closing an application with open MCI devices can prevent other applications
from using those devices until Windows is restarted.
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