下面的例子是采用MFC,在菜单中添加命令项,然后在view类中响应菜单命令来控制系统音量:Project->Setting->Link中添加:Winmm.lib在XXXXXview.cpp中:#include <windows.h>
#include <mmsystem.h>void CMixerOpeninMFXView::OnCustAction() //菜单命令响应函数
{
// TODO: Add your command 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. // Open the mixer. This opens the mixer with a deviceID of 0. If you
// have a single sound card/mixer, then this will open it. If you have
// multiple sound cards/mixers, the deviceIDs will be 0, 1, 2, and
// so on.
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); // Specify the line you want to get.
mxl.dwComponentType = MIXERLINE_COMPONENTTYPE_DST_SPEAKERS; rc = mixerGetLineInfo((HMIXEROBJ)hMixer, &mxl,
MIXER_GETLINEINFOF_COMPONENTTYPE);
if (MMSYSERR_NOERROR == rc) {
// Couldn't get the mixer line.
} // 取得控制
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.
} // After successfully getting the peakmeter control, the volume range
// will be specified by mxc.Bounds.lMinimum to 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 structure
ZeroMemory(&mxcd, sizeof(mxcd));
mxcd.cbStruct = sizeof(mxcd);
mxcd.cbDetails = sizeof(volStruct);
mxcd.dwControlID = mxc.dwControlID;
mxcd.paDetails = &volStruct;
mxcd.cChannels = 1; // 取得当前的音量值
rc = mixerGetControlDetails((HMIXEROBJ)hMixer, &mxcd,
MIXER_GETCONTROLDETAILSF_VALUE);
if (MMSYSERR_NOERROR == rc) {
// Couldn't get the current volume.
}
volume = volStruct.lValue; volStruct.lValue = 30000; //设置想要设置的音量值
rc = mixerSetControlDetails((HMIXEROBJ)hMixer, &mxcd,
MIXER_SETCONTROLDETAILSF_VALUE);
}如果需要进一步的信息,您可以参看:
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/multimed/mmfunc_0icz.asp等有关信息。
- 微软全球技术中心 VC技术支持本贴子以“现状”提供且没有任何担保,同时也没有授予任何权利。具体事项可参见使用条款
(http://support.microsoft.com/directory/worldwide/zh-cn/community/terms_chs.asp)。为了为您创建更好的讨论环境,请参加我们的用户满意度调查
(http://support.microsoft.com/directory/worldwide/zh-cn/community/survey.asp?key=(S,49854782))。
#include <mmsystem.h>void CMixerOpeninMFXView::OnCustAction() //菜单命令响应函数
{
// TODO: Add your command 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. // Open the mixer. This opens the mixer with a deviceID of 0. If you
// have a single sound card/mixer, then this will open it. If you have
// multiple sound cards/mixers, the deviceIDs will be 0, 1, 2, and
// so on.
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); // Specify the line you want to get.
mxl.dwComponentType = MIXERLINE_COMPONENTTYPE_DST_SPEAKERS; rc = mixerGetLineInfo((HMIXEROBJ)hMixer, &mxl,
MIXER_GETLINEINFOF_COMPONENTTYPE);
if (MMSYSERR_NOERROR == rc) {
// Couldn't get the mixer line.
} // 取得控制
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.
} // After successfully getting the peakmeter control, the volume range
// will be specified by mxc.Bounds.lMinimum to 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 structure
ZeroMemory(&mxcd, sizeof(mxcd));
mxcd.cbStruct = sizeof(mxcd);
mxcd.cbDetails = sizeof(volStruct);
mxcd.dwControlID = mxc.dwControlID;
mxcd.paDetails = &volStruct;
mxcd.cChannels = 1; // 取得当前的音量值
rc = mixerGetControlDetails((HMIXEROBJ)hMixer, &mxcd,
MIXER_GETCONTROLDETAILSF_VALUE);
if (MMSYSERR_NOERROR == rc) {
// Couldn't get the current volume.
}
volume = volStruct.lValue; volStruct.lValue = 30000; //设置想要设置的音量值
rc = mixerSetControlDetails((HMIXEROBJ)hMixer, &mxcd,
MIXER_SETCONTROLDETAILSF_VALUE);
}如果需要进一步的信息,您可以参看:
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/multimed/mmfunc_0icz.asp等有关信息。
- 微软全球技术中心 VC技术支持本贴子以“现状”提供且没有任何担保,同时也没有授予任何权利。具体事项可参见使用条款
(http://support.microsoft.com/directory/worldwide/zh-cn/community/terms_chs.asp)。为了为您创建更好的讨论环境,请参加我们的用户满意度调查
(http://support.microsoft.com/directory/worldwide/zh-cn/community/survey.asp?key=(S,49854782))。
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