www.pudn.com > vc-network-communication.rar > VolumeCtrl.cpp

//NetTalk 
/*------------------------------------------------------------------------------*\ 
 ============================= 
   模块名称: VolumeCtrl.cpp 
 ============================= 
  
 [版权] 
  
   2000-2002  115软件工厂  版权所有 
                                               
\*------------------------------------------------------------------------------*/ 
//not used 
#include "wndx.h" 
#include  
#include "VolumeCtrl.h" 
 
/*------------------------------------------------------------------------------*/ 
CVolumeCtrl::CVolumeCtrl() 
{ 
	m_h=0; 
} 
/*------------------------------------------------------------------------------*/ 
CVolumeCtrl::~CVolumeCtrl() 
{ 
	Close(); 
} 
/*------------------------------------------------------------------------------*/ 
BOOL CVolumeCtrl::Open(UINT uDevHandle,BOOL bFlag) 
{ 
	BOOL bRet=FALSE; 
	Close(); 
	DWORD f; 
	if(bFlag) 
		f=MIXER_OBJECTF_HWAVEOUT; 
	else 
		f=MIXER_OBJECTF_HWAVEIN; 
	MMRESULT mmr; 
	mmr=mixerOpen(&m_h,uDevHandle,0,0,f); 
	if(mmr!=MMSYSERR_NOERROR) 
		goto RET; 
	 
	m_mxl.cbStruct      = sizeof(m_mxl); 
	m_mxl.dwDestination = 0; 
	mmr = mixerGetLineInfo((HMIXEROBJ)m_h, &m_mxl, MIXER_GETLINEINFOF_DESTINATION); 
	if (MMSYSERR_NOERROR != mmr) 
		goto RET; 
	 
	m_mxlc.cbStruct       = sizeof(m_mxlc); 
	m_mxlc.dwLineID       = m_mxl.dwLineID; 
	m_mxlc.cControls      = m_mxl.cControls; 
	m_mxlc.cbmxctrl       = sizeof(m_mxctrl); 
	m_mxlc.dwControlType  = MIXERCONTROL_CONTROLTYPE_VOLUME; 
	m_mxlc.pamxctrl       = &m_mxctrl; 
	mmr = mixerGetLineControls((HMIXEROBJ)m_h, &m_mxlc, MIXER_GETLINECONTROLSF_ONEBYTYPE); 
	if (MMSYSERR_NOERROR != mmr) 
		goto RET; 
 
	bRet=TRUE; 
RET: 
	if(!bRet) 
		Close(); 
	return bRet; 
} 
/*------------------------------------------------------------------------------*/ 
BOOL CVolumeCtrl::Close() 
{ 
	MMRESULT mmr; 
	if(m_h) 
		mmr=mixerClose(m_h); 
	m_h=0; 
	if(mmr==MMSYSERR_NOERROR) return TRUE; 
	else return FALSE; 
} 
/*------------------------------------------------------------------------------*/ 
DWORD CVolumeCtrl::GetVolume() 
{ 
	if(!m_h) return 0; 
	MIXERCONTROLDETAILS mxcd; 
	MIXERCONTROLDETAILS_UNSIGNED mxcd_u; 
	mxcd.cbStruct=sizeof(mxcd); 
	mxcd.cChannels=1; 
	mxcd.dwControlID=m_mxctrl.dwControlID; 
	mxcd.paDetails=&mxcd_u; 
	mxcd.cbDetails=4; 
	mxcd.cMultipleItems=m_mxctrl.cMultipleItems; 
	MMRESULT mmr; 
	mmr=mixerGetControlDetails((HMIXEROBJ)m_h,&mxcd,MIXER_SETCONTROLDETAILSF_VALUE); 
	if(mmr!=MMSYSERR_NOERROR) 
		return 0; 
	else 
		return (mxcd_u.dwValue-m_mxctrl.Bounds.dwMinimum)*100/(m_mxctrl.Bounds.dwMaximum-m_mxctrl.Bounds.dwMinimum); 
} 
/*------------------------------------------------------------------------------*/ 
BOOL CVolumeCtrl::SetVolume(DWORD dwValue) 
{ 
	if(!m_h) return FALSE; 
 
	MIXERCONTROLDETAILS mxcd; 
	MIXERCONTROLDETAILS_UNSIGNED mxcd_u; 
	mxcd.cbStruct=sizeof(mxcd); 
	mxcd.cChannels=1; 
	mxcd.dwControlID=m_mxctrl.dwControlID; 
	mxcd.paDetails=&mxcd_u; 
	mxcd.cbDetails= sizeof(MIXERCONTROLDETAILS_UNSIGNED); 
	mxcd.cMultipleItems=0; 
	mxcd_u.dwValue=dwValue*(m_mxctrl.Bounds.dwMaximum-m_mxctrl.Bounds.dwMinimum)/100+m_mxctrl.Bounds.dwMinimum; 
	MMRESULT mmr; 
	mmr=mixerSetControlDetails((HMIXEROBJ)m_h,&mxcd,MIXER_SETCONTROLDETAILSF_VALUE); 
	if(mmr!=MMSYSERR_NOERROR) 
		return FALSE; 
	return TRUE; 
}