www.pudn.com > direct_mp3.rar > IVolume.h

// IVolume.h : IVolume interface definition. 
// Developer : Alex Chmut 
// Created : 8/11/98 
#pragma once 
 
#include  
// User-defined callback for volume change notification 
typedef void (CALLBACK *PONMICVOULUMECHANGE)( DWORD dwCurrentVolume, DWORD dwUserValue ); 
 
//////////////////////////////////////////////////////////////////////// 
// IVolume interface 
class __declspec(novtable) IVolume 
{ 
public: 
	virtual BOOL	IsAvailable() = 0; 
	virtual void	Enable() = 0; 
	virtual void	Disable() = 0; 
 
	virtual DWORD	GetVolumeMetric() = 0; 
 
	virtual DWORD	GetMinimalVolume() = 0; 
	virtual DWORD	GetMaximalVolume() = 0; 
 
	virtual DWORD	GetCurrentVolume() = 0; 
	virtual void	SetCurrentVolume( DWORD dwValue ) = 0; 
 
	virtual void	RegisterNotificationSink( PONMICVOULUMECHANGE, DWORD ) = 0; 
};