Note
Access to this page requires authorization. You can try signing in or changing directories.
Access to this page requires authorization. You can try changing directories.
When you want to use a mixer device, you can simply begin using it or you can explicitly open the device before using it.
Explicitly opening a mixer device offers two main benefits:
- It guarantees the continued existence of that mixer device.
- It lets you receive notification of audio line and control changes.
You can use the mixerOpen function to explicitly open a mixer device. This function takes as parameters a device identifier, a pointer to a memory location, and other values unique to each type of device.
The memory location is filled with a device handle. Use this device handle to identify the open mixer device when calling other audio mixer functions. As long as a handle of a mixer device exists, the device continues to exist in the system.
If a configuration change occurs to the mixer device and it has not been explicitly opened, your application might suddenly be unable to access it.
**Note **The difference between device identifiers and device handles is important. Device handles are returned when you open a device driver using mixerOpen.
You can use the mixerClose function to close a mixer device. You should close the device after you finish using it.
See Also
Send Feedback on this topic to the authors