音量调节滑动条

[bruce2017]

想做一个音量调节的界面，目前已经将初始音量设置的功能实现，现在想做一个滑动条来控制系统音量，请问如何实现，音量设置部分的代码如下，请各位帮忙下，写具体点，小弟很菜，解决立即结贴，在线等！

MMRESULT rc;
HMIXER hMixer;
MIXERCONTROL mxc;
MIXERLINE mxl;
MIXERLINECONTROLS mxlc;

//
rc = mixerOpen(&hMixer, 0,0,0,0);
if (MMSYSERR_NOERROR != rc) {

}


ZeroMemory(&mxl,sizeof(mxl));
mxl.cbStruct = sizeof(mxl);


mxl.dwComponentType = MIXERLINE_COMPONENTTYPE_DST_SPEAKERS;

rc = mixerGetLineInfo((HMIXEROBJ)hMixer, &mxl,
MIXER_GETLINEINFOF_COMPONENTTYPE);
if (MMSYSERR_NOERROR == rc) {

}

ZeroMemory(&mxlc, sizeof(mxlc));
mxlc.cbStruct = sizeof(mxlc);
mxlc.dwLineID = mxl.dwLineID;
mxlc.dwControlType = MIXERCONTROL_CONTROLTYPE_VOLUME;
mxlc.cControls = 1;
mxlc.cbmxctrl = sizeof(mxc);
mxlc.pamxctrl = &mxc;
ZeroMemory(&mxc, sizeof(mxc));
mxc.cbStruct = sizeof(mxc);
rc = mixerGetLineControls((HMIXEROBJ)hMixer,&mxlc,
MIXER_GETLINECONTROLSF_ONEBYTYPE);
if (MMSYSERR_NOERROR != rc) {

}



MIXERCONTROLDETAILS mxcd;
MIXERCONTROLDETAILS_SIGNED volStruct;
long volume;


ZeroMemory(&mxcd, sizeof(mxcd));
mxcd.cbStruct = sizeof(mxcd);
mxcd.cbDetails = sizeof(volStruct);
mxcd.dwControlID = mxc.dwControlID;
mxcd.paDetails = &volStruct;
mxcd.cChannels = 1;


rc = mixerGetControlDetails((HMIXEROBJ)hMixer, &mxcd,
MIXER_GETCONTROLDETAILSF_VALUE);
if (MMSYSERR_NOERROR == rc) {

}
volume = volStruct.lValue;


volStruct.lValue = 0;
rc = mixerSetControlDetails((HMIXEROBJ)hMixer, &mxcd,
MIXER_SETCONTROLDETAILSF_VALUE);

[bruce2017]

我是在对话框上放一个Slider 控件，为此控件定义变量m_Slider

[carrera007]

CSliderCtrl *pDance=(CSliderCtrl*)GetDlgItem(IDC_SLIDER1); //用pDance获取控件的指针，IDC_SLIDER为资源名称
float fPitch=(float)pDance->GetPos(); //GetPos()方法为获取滑块当前位置

[bruce2017]

Hi carrera007,还是没有办法调节，请帮忙看下我的哪里有问题，谢谢！

void CAudioSetDlg::OnNMCustomdrawSlider1(NMHDR *pNMHDR, LRESULT *pResult)
{
LPNMCUSTOMDRAW pNMCD = reinterpret_cast<LPNMCUSTOMDRAW>(pNMHDR);
// TODO: Add your control notification handler code here

MMRESULT rc; // Return code.
HMIXER hMixer; // Mixer handle used in mixer API calls.
MIXERCONTROL mxc; // Holds the mixer control data.
MIXERLINE mxl; // Holds the mixer line data.
MIXERLINECONTROLS mxlc; // Obtains the mixer control.

// 打开mixer. 单声卡的deviceID为0.
rc = mixerOpen(&hMixer, 0,0,0,0);
if (MMSYSERR_NOERROR != rc) {
// Couldn't open the mixer.
}

// 初始化MIXERLINE结构体.
ZeroMemory(&mxl,sizeof(mxl));
mxl.cbStruct = sizeof(mxl);

// 指出需要获取的通道，扬声器用MIXERLINE_COMPONENTTYPE_DST_SPEAKERS
// mxl.dwComponentType = MIXERLINE_COMPONENTTYPE_DST_SPEAKERS;
mxl.dwComponentType = MIXERLINE_COMPONENTTYPE_SRC_WAVEOUT;;

rc = mixerGetLineInfo((HMIXEROBJ)hMixer, &mxl,
MIXER_GETLINEINFOF_COMPONENTTYPE);
if (MMSYSERR_NOERROR == rc) {
// Couldn't get the mixer line.
}

// 取得控制器.
ZeroMemory(&mxlc, sizeof(mxlc));
mxlc.cbStruct = sizeof(mxlc);
mxlc.dwLineID = mxl.dwLineID;
mxlc.dwControlType = MIXERCONTROL_CONTROLTYPE_VOLUME;
mxlc.cControls = 1;
mxlc.cbmxctrl = sizeof(mxc);
mxlc.pamxctrl = &mxc;
ZeroMemory(&mxc, sizeof(mxc));
mxc.cbStruct = sizeof(mxc);
rc = mixerGetLineControls((HMIXEROBJ)hMixer,&mxlc,
MIXER_GETLINECONTROLSF_ONEBYTYPE);
if (MMSYSERR_NOERROR != rc) {
// Couldn't get the control.
}

// 获取控制器中的值的音量范围：mxc.Bounds.lMinimum到mxc.Bounds.lMaximum.

MIXERCONTROLDETAILS mxcd; // Gets the control values.
MIXERCONTROLDETAILS_SIGNED volStruct; // Gets the control values.
long volume; // Holds the final volume value.

// 初始化MIXERCONTROLDETAILS结构体
ZeroMemory(&mxcd, sizeof(mxcd));
mxcd.cbStruct = sizeof(mxcd);
mxcd.cbDetails = sizeof(volStruct);
mxcd.dwControlID = mxc.dwControlID;
mxcd.paDetails = &volStruct;
mxcd.cChannels = 1;

// 获得音量值
rc = mixerGetControlDetails((HMIXEROBJ)hMixer, &mxcd,
MIXER_GETCONTROLDETAILSF_VALUE);
if (MMSYSERR_NOERROR == rc) {
// Couldn't get the current volume.
}
// volume = volStruct.lValue;

// volStruct.lValue = 25000; //想要设置的值
// volStruct.lValue = 65535;
// rc = mixerSetControlDetails((HMIXEROBJ)hMixer, &mxcd,
// MIXER_SETCONTROLDETAILSF_VALUE);





CSliderCtrl *pDance=(CSliderCtrl*)GetDlgItem(IDC_SLIDER1);
float fPitch=(float)pDance->GetPos();
fPitch = volStruct.lValue;


rc = mixerSetControlDetails((HMIXEROBJ)hMixer, &mxcd,
MIXER_SETCONTROLDETAILSF_VALUE);

*pResult = 0;
}

[wu_qing_yun]

判断Slider拖动的位置，然后定义音量