A class that controls the volume.

 

 

When writing multimedia applications, you often need to use volume control, which provides you with a very convenient

Volume processing method.

 

 This class provides the following public interfaces. (In the file IVolume. h ).

 

 BoolIsAvailable ()-Says whether the volume controling is possible

 VoidEnable ()-Enables the line of the volume control

 VoidDisable ()-Disables the line of the volume control

 DWORDGetVolumeMetric ()-Retrieves the granularity of volume

 DWORDGetMinimalVolume ()-Retrieves the minimal volume that can be set

 DWORDGetMaximalVolume ()-Retrieves the maximal volume that can be set

 DWORDGetCurrentVolume ()-Retrieve the current volume

 VoidSetCurrentVolume (DWORD dwValue)-Set the volume

 

In addition, the last function allows you to register a user-defined callback function to handle notifications of volume changes.

VoidRegisterNotificationSink (PONMICVOULUMECHANGE, DWORD)

 

This interface usesVolumeOutMaster (VolumeOutMaster. h/cpp), CVolumeOutWave (VolumeOutWave. h/cpp)

AndCVolumeInXXX (VolumeInXXX. h/cpp) class.

 

These classes are very simple to use., There are detailed instructions for use in the source code compressed file, which will not be described here.