VC调节音量

//----------------------------设定音量--------------------------------------- bool GetVolumeControl(HMIXER hmixer ,long componentType,long ctrlType,MIXERCONTROL* mxc) { MIXERLINECONTROLS mxlc; MIXERLINE mxl; mxl.cbStruct = sizeof(mxl); mxl.dwComponentType = componentType; if(!mixerGetLineInfo((HMIXEROBJ)hmixer, &mxl, MIXER_GETLINEINFOF_COMPONENTTYPE)) { mxlc.cbStruct = sizeof(mxlc); mxlc.dwLineID = mxl.dwLineID; mxlc.dwControlType = ctrlType; mxlc.cControls = 1; mxlc.cbmxctrl = sizeof(MIXERCONTROL); mxlc.pamxctrl = mxc; if(mixerGetLineControls((HMIXEROBJ)hmixer,&mxlc,MIXER_GETLINECONTROLSF_ONEBYTYPE)) return 0; else return 1; } return 0; } //--------------------------------------------------------------------------- long GetMuteValue(HMIXER hmixer ,MIXERCONTROL *mxc) { MIXERCONTROLDETAILS mxcd; MIXERCONTROLDETAILS_BOOLEAN mxcdMute; mxcd.hwndOwner = 0; mxcd.cbStruct = sizeof(mxcd); mxcd.dwControlID = mxc->dwControlID; mxcd.cbDetails = sizeof(mxcdMute); mxcd.paDetails = &mxcdMute; mxcd.cChannels = 1; mxcd.cMultipleItems = 0; if (mixerGetControlDetails((HMIXEROBJ)hmixer, &mxcd,MIXER_OBJECTF_HMIXER|MIXER_GETCONTROLDETAILSF_VALUE)) return -1; return mxcdMute.fValue; } //--------------------------------------------------------------------------- unsigned GetVolumeValue(HMIXER hmixer ,MIXERCONTROL *mxc) { MIXERCONTROLDETAILS mxcd; MIXERCONTROLDETAILS_UNSIGNED vol; vol.dwValue=0; mxcd.hwndOwner = 0; mxcd.cbStruct = sizeof(mxcd); mxcd.dwControlID = mxc->dwControlID; mxcd.cbDetails = sizeof(vol); mxcd.paDetails = &vol; mxcd.cChannels = 1; if(mixerGetControlDetails((HMIXEROBJ)hmixer, &mxcd, MIXER_OBJECTF_HMIXER|MIXER_GETCONTROLDETAILSF_VALUE)) return -1; return vol.dwValue; } //--------------------------------------------------------------------------- bool SetMuteValue(HMIXER hmixer ,MIXERCONTROL *mxc, bool mute) { MIXERCONTROLDETAILS mxcd; MIXERCONTROLDETAILS_BOOLEAN mxcdMute;mxcdMute.fValue=mute; mxcd.hwndOwner = 0; mxcd.dwControlID = mxc->dwControlID; mxcd.cbStruct = sizeof(mxcd); mxcd.cbDetails = sizeof(mxcdMute); mxcd.paDetails = &mxcdMute; mxcd.cChannels = 1; mxcd.cMultipleItems = 0; if (mixerSetControlDetails((HMIXEROBJ)hmixer, &mxcd, MIXER_OBJECTF_HMIXER|MIXER_SETCONTROLDETAILSF_VALUE)) return 0; return 1; } //--------------------------------------------------------------------------- bool SetVolumeValue(HMIXER hmixer ,MIXERCONTROL *mxc, long volume) { MIXERCONTROLDETAILS mxcd; MIXERCONTROLDETAILS_UNSIGNED vol;vol.dwValue = volume; mxcd.hwndOwner = 0; mxcd.dwControlID = mxc->dwControlID; mxcd.cbStruct = sizeof(mxcd); mxcd.cbDetails = sizeof(vol); mxcd.paDetails = &vol; mxcd.cChannels = 1; if(mixerSetControlDetails((HMIXEROBJ)hmixer, &mxcd, MIXER_OBJECTF_HMIXER|MIXER_SETCONTROLDETAILSF_VALUE)) return 0; return 1; } //--------------------------------------------------------------------------- unsigned WINAPI GetVolume(int dev)//得到设备的音量dev=0主音量，1WAVE ,2MIDI ,3 LINE IN { long device;unsigned rt=0; MIXERCONTROL volCtrl; HMIXER hmixer; switch (dev) { case 1: device=MIXERLINE_COMPONENTTYPE_SRC_WAVEOUT; break; case 2: device=MIXERLINE_COMPONENTTYPE_SRC_SYNTHESIZER; break; case 3: // device=MIXERLINE_COMPONENTTYPE_SRC_COMPACTDISC; break; // cd 音量 // device=MIXERLINE_COMPONENTTYPE_SRC_MICROPHONE; break; //麦克风音量 // device=MIXERLINE_COMPONENTTYPE_SRC_LINE; break; //PC 扬声器音量 device=MIXERLINE_COMPONENTTYPE_SRC_COMPACTDISC; break; default: device=MIXERLINE_COMPONENTTYPE_DST_SPEAKERS; } if(mixerOpen(&hmixer, 0, 0, 0, 0)) return 0; if(!GetVolumeControl(hmixer,device,MIXERCONTROL_CONTROLTYPE_VOLUME,&volCtrl)) return 0; rt=GetVolumeValue(hmixer,&volCtrl)*100/volCtrl.Bounds.lMaximum; mixerClose(hmixer); return rt; } //--------------------------------------------------------------------------- bool WINAPI SetVolume(long dev,long vol)//设置设备的音量 { // dev =0,1,2 分别表示主音量,波形,MIDI ,LINE IN // vol=0-100 表示音量的大小 , 设置与返回音量的值用的是百分比，即音量从0 - 100，而不是设备的绝对值 // retrun false 表示设置音量的大小的操作不成功 // retrun true 表示设置音量的大小的操作成功 long device; bool rc=false; MIXERCONTROL volCtrl; HMIXER hmixer; switch (dev) { case 1: device=MIXERLINE_COMPONENTTYPE_SRC_WAVEOUT; break; case 2: device=MIXERLINE_COMPONENTTYPE_SRC_SYNTHESIZER; break; case 3: device=MIXERLINE_COMPONENTTYPE_SRC_COMPACTDISC; break; default: device=MIXERLINE_COMPONENTTYPE_DST_SPEAKERS; } if(mixerOpen(&hmixer, 0, 0, 0, 0)) return 0; if(GetVolumeControl(hmixer,device,MIXERCONTROL_CONTROLTYPE_VOLUME,&volCtrl)) { vol=vol*volCtrl.Bounds.lMaximum/100; if(SetVolumeValue(hmixer,&volCtrl,vol)) rc=true; } mixerClose(hmixer); return rc; } //--------------------------------------------------------------------------- bool WINAPI SetMute(long dev,long vol)//设置设备静音 { // dev =0,1,2 分别表示主音量,波形,MIDI ,LINE IN // vol=0,1 分别表示取消静音,设置静音 // retrun false 表示取消或设置静音操作不成功 // retrun true 表示取消或设置静音操作成功 long device; bool rc=false; MIXERCONTROL volCtrl; HMIXER hmixer; switch (dev) { case 1: device=MIXERLINE_COMPONENTTYPE_SRC_WAVEOUT; break; case 2: device=MIXERLINE_COMPONENTTYPE_SRC_SYNTHESIZER; break; case 3: device=MIXERLINE_COMPONENTTYPE_SRC_COMPACTDISC; break; default: device=MIXERLINE_COMPONENTTYPE_DST_SPEAKERS; } if(mixerOpen(&hmixer, 0, 0, 0, 0)) return 0; if(GetVolumeControl(hmixer,device,MIXERCONTROL_CONTROLTYPE_MUTE,&volCtrl)) if(SetMuteValue(hmixer,&volCtrl,(bool)vol)) rc=true; mixerClose(hmixer); return rc; } //--------------------------------------------------------------------------- bool WINAPI GetMute(long dev)//检查设备是否静音 { //dev =0,1,2 分别表示主音量，波形,MIDI ,LINE IN // retrun false 表示没有静音 // retrun true 表示静音 long device; bool rc=false; MIXERCONTROL volCtrl; HMIXER hmixer; switch (dev) { case 1: device=MIXERLINE_COMPONENTTYPE_SRC_WAVEOUT; break; case 2: device=MIXERLINE_COMPONENTTYPE_SRC_SYNTHESIZER; break; case 3: device=MIXERLINE_COMPONENTTYPE_SRC_COMPACTDISC; break; default: device=MIXERLINE_COMPONENTTYPE_DST_SPEAKERS; } if(mixerOpen(&hmixer, 0, 0, 0, 0)) return 0; if(GetVolumeControl(hmixer,device,MIXERCONTROL_CONTROLTYPE_MUTE,&volCtrl)) rc=GetMuteValue(hmixer,&volCtrl); mixerClose(hmixer); return rc; } 使用： //调节音量 void __fastcall TForm1::TrackBar0Change(TObject *Sender) { SetVolume(0,TrackBar0->Position*10); } //静音 void __fastcall TForm1::CheckBox0Click(TObject *Sender) { SetMute(0,CheckBox0->Checked); }