[C#] 控制系统音量-第一章

一直想控制系统音量，但是似乎C#都有着很多的问题，索性去看API。

最后找到了一个外国友人的东西，外国友人写的类就是好看，感觉比自己写的要规范好多啊！

自己使用了此类后发现了一个问题，在XP系统下正常，但是Win7以上都不能正常使用。

然后又查了一下官方的解释，原来微软win7后就改动了底层的音量控制的东西。

现在贴出来，希望大家对大家有帮助，在后面将讲解在Win7及其以上怎么操作系统音量的问题！

    class AudioMixerHelper{public const int MMSYSERR_NOERROR = 0;public const int MAXPNAMELEN = 32;public const int MIXER_LONG_NAME_CHARS = 64;public const int MIXER_SHORT_NAME_CHARS = 16;public const int MIXER_GETLINEINFOF_COMPONENTTYPE = 0x3;public const int MIXER_GETCONTROLDETAILSF_VALUE = 0x0;public const int MIXER_GETLINECONTROLSF_ONEBYTYPE = 0x2;public const int MIXER_SETCONTROLDETAILSF_VALUE = 0x0;public const int MIXERLINE_COMPONENTTYPE_DST_FIRST = 0x0;public const int MIXERLINE_COMPONENTTYPE_SRC_FIRST = 0x1000;public const int MIXERLINE_COMPONENTTYPE_DST_SPEAKERS =(MIXERLINE_COMPONENTTYPE_DST_FIRST + 4);public const int MIXERLINE_COMPONENTTYPE_SRC_MICROPHONE =(MIXERLINE_COMPONENTTYPE_SRC_FIRST + 3);public const int MIXERLINE_COMPONENTTYPE_SRC_LINE = (MIXERLINE_COMPONENTTYPE_SRC_FIRST + 2);public const int MIXERCONTROL_CT_CLASS_FADER = 0x50000000;public const int MIXERCONTROL_CT_UNITS_UNSIGNED = 0x30000;public const int MIXERCONTROL_CONTROLTYPE_FADER = (MIXERCONTROL_CT_CLASS_FADER | MIXERCONTROL_CT_UNITS_UNSIGNED);public const int MIXERCONTROL_CONTROLTYPE_VOLUME = (MIXERCONTROL_CONTROLTYPE_FADER + 1);[DllImport("winmm.dll", CharSet=CharSet.Ansi)]private static extern int mixerClose (int hmx);[DllImport("winmm.dll", CharSet=CharSet.Ansi)]private static extern int mixerGetControlDetailsA (int hmxobj,refMIXERCONTROLDETAILS pmxcd , int fdwDetails);[DllImport("winmm.dll", CharSet=CharSet.Ansi)]private static extern int mixerGetDevCapsA(int uMxId, MIXERCAPS pmxcaps, int cbmxcaps);[DllImport("winmm.dll", CharSet=CharSet.Ansi)]private static extern int mixerGetID (int hmxobj, int pumxID, int fdwId);[DllImport("winmm.dll", CharSet=CharSet.Ansi)]private static extern int mixerGetLineControlsA (int hmxobj,ref MIXERLINECONTROLS pmxlc, int fdwControls);[DllImport("winmm.dll", CharSet=CharSet.Ansi)]private static extern int mixerGetLineInfoA (int hmxobj,ref MIXERLINE pmxl , int fdwInfo);[DllImport("winmm.dll", CharSet=CharSet.Ansi)]private static extern int mixerGetNumDevs();[DllImport("winmm.dll", CharSet=CharSet.Ansi)]private static extern int mixerMessage(int hmx , int uMsg , int dwParam1 , int dwParam2);[DllImport("winmm.dll", CharSet=CharSet.Ansi)]private static extern int mixerOpen (out int phmx , int uMxId ,int dwCallback , int dwInstance , int fdwOpen);[DllImport("winmm.dll", CharSet=CharSet.Ansi)]private static extern int mixerSetControlDetails(int hmxobj ,ref MIXERCONTROLDETAILS pmxcd , int fdwDetails);public struct MIXERCAPS{public int wMid;public int wPid;public int vDriverVersion;[MarshalAs(UnmanagedType.ByValTStr, SizeConst=MAXPNAMELEN)]public string szPname;public int fdwSupport;public int cDestinations;}public struct MIXERCONTROL{public int cbStruct;public int dwControlID;public int dwControlType;public int fdwControl;public int cMultipleItems;[MarshalAs(UnmanagedType.ByValTStr,SizeConst=MIXER_SHORT_NAME_CHARS)]public string szShortName ;[MarshalAs( UnmanagedType.ByValTStr,SizeConst=MIXER_LONG_NAME_CHARS)]public string szName;public int lMinimum;public int lMaximum;[MarshalAs(UnmanagedType.U4, SizeConst=10)]public int reserved;}public struct MIXERCONTROLDETAILS{public int cbStruct;public int dwControlID;public int cChannels;public int item;public int cbDetails;public IntPtr paDetails;}public struct MIXERCONTROLDETAILS_UNSIGNED{public int dwValue;}public struct MIXERLINE{public int cbStruct;public int dwDestination;public int dwSource;public int dwLineID;public int fdwLine;public int dwUser;public int dwComponentType;public int cChannels;public int cConnections;public int cControls;[MarshalAs(UnmanagedType.ByValTStr,SizeConst=MIXER_SHORT_NAME_CHARS)]public string szShortName;[MarshalAs(UnmanagedType.ByValTStr,SizeConst=MIXER_LONG_NAME_CHARS )]public string szName;public int dwType;public int dwDeviceID;public int wMid;public int wPid;public int vDriverVersion ;[MarshalAs(UnmanagedType.ByValTStr, SizeConst=MAXPNAMELEN)]public string szPname ;}public struct MIXERLINECONTROLS{public int cbStruct;public int dwLineID;public int dwControl;public int cControls;public int cbmxctrl;public IntPtr pamxctrl;}private static bool GetVolumeControl(int hmixer, int componentType,int ctrlType, out MIXERCONTROL mxc, out int vCurrentVol){// This function attempts to obtain a mixer control.// Returns True if successful.MIXERLINECONTROLS mxlc = new MIXERLINECONTROLS();MIXERLINE mxl = new MIXERLINE();MIXERCONTROLDETAILS pmxcd = new MIXERCONTROLDETAILS();MIXERCONTROLDETAILS_UNSIGNED du = new MIXERCONTROLDETAILS_UNSIGNED();mxc = new MIXERCONTROL();int rc;bool retValue;vCurrentVol = -1;mxl.cbStruct = Marshal.SizeOf(mxl);mxl.dwComponentType = componentType;rc = mixerGetLineInfoA(hmixer,ref mxl,MIXER_GETLINEINFOF_COMPONENTTYPE );if(MMSYSERR_NOERROR == rc){int sizeofMIXERCONTROL = 152;int ctrl = Marshal.SizeOf(typeof(MIXERCONTROL));mxlc.pamxctrl = Marshal.AllocCoTaskMem(sizeofMIXERCONTROL);mxlc.cbStruct = Marshal.SizeOf(mxlc);mxlc.dwLineID = mxl.dwLineID;mxlc.dwControl = ctrlType;mxlc.cControls = 1;mxlc.cbmxctrl = sizeofMIXERCONTROL;// Allocate a buffer for the controlmxc.cbStruct = sizeofMIXERCONTROL;// Get the controlrc = mixerGetLineControlsA(hmixer,ref mxlc,MIXER_GETLINECONTROLSF_ONEBYTYPE);if(MMSYSERR_NOERROR == rc){retValue = true;// Copy the control into the destination structuremxc = (MIXERCONTROL)Marshal.PtrToStructure(mxlc.pamxctrl,typeof(MIXERCONTROL));}else{retValue = false;}int sizeofMIXERCONTROLDETAILS = Marshal.SizeOf(typeof(MIXERCONTROLDETAILS));int sizeofMIXERCONTROLDETAILS_UNSIGNED = Marshal.SizeOf(typeof(MIXERCONTROLDETAILS_UNSIGNED));pmxcd.cbStruct = sizeofMIXERCONTROLDETAILS;pmxcd.dwControlID = mxc.dwControlID;pmxcd.paDetails = Marshal.AllocCoTaskMem(sizeofMIXERCONTROLDETAILS_UNSIGNED) ;pmxcd.cChannels = 1;pmxcd.item = 0;pmxcd.cbDetails = sizeofMIXERCONTROLDETAILS_UNSIGNED;rc = mixerGetControlDetailsA(hmixer,ref pmxcd,MIXER_GETCONTROLDETAILSF_VALUE);du = (MIXERCONTROLDETAILS_UNSIGNED)Marshal.PtrToStructure(pmxcd.paDetails, typeof(MIXERCONTROLDETAILS_UNSIGNED));vCurrentVol = du.dwValue;return retValue;}retValue = false;return retValue;}private static bool SetVolumeControl(int hmixer, MIXERCONTROL mxc,int volume){// This function sets the value for a volume control.// Returns True if successfulbool retValue;int rc;MIXERCONTROLDETAILS mxcd = new MIXERCONTROLDETAILS();MIXERCONTROLDETAILS_UNSIGNED vol = new MIXERCONTROLDETAILS_UNSIGNED();mxcd.item = 0;mxcd.dwControlID = mxc.dwControlID;mxcd.cbStruct = Marshal.SizeOf(mxcd);mxcd.cbDetails = Marshal.SizeOf(vol);// Allocate a buffer for the control value buffermxcd.cChannels = 1;vol.dwValue = volume;// Copy the data into the control value buffermxcd.paDetails = Marshal.AllocCoTaskMem(Marshal.SizeOf(typeof(MIXERCONTROLDETAILS_UNSIGNED)));Marshal.StructureToPtr(vol, mxcd.paDetails,false);// Set the control valuerc = mixerSetControlDetails(hmixer,ref mxcd,MIXER_SETCONTROLDETAILSF_VALUE);if(MMSYSERR_NOERROR == rc){retValue = true;}else{retValue = false;} return retValue;}public static int GetVolume(){int mixer;MIXERCONTROL volCtrl = new MIXERCONTROL();int currentVol;mixerOpen(out mixer,0 ,0 ,0, 0);int type = MIXERCONTROL_CONTROLTYPE_VOLUME;GetVolumeControl(mixer,MIXERLINE_COMPONENTTYPE_DST_SPEAKERS,type,out volCtrl, out currentVol);mixerClose(mixer);return currentVol;}public static void SetVolume(int vVolume){int mixer;MIXERCONTROL volCtrl = new MIXERCONTROL();int currentVol;mixerOpen(out mixer,0 ,0 ,0, 0);int type = MIXERCONTROL_CONTROLTYPE_VOLUME;GetVolumeControl(mixer,MIXERLINE_COMPONENTTYPE_DST_SPEAKERS,type,out volCtrl, out currentVol);if(vVolume > volCtrl.lMaximum) vVolume = volCtrl.lMaximum;if(vVolume < volCtrl.lMinimum) vVolume = volCtrl.lMinimum;SetVolumeControl(mixer, volCtrl, vVolume);GetVolumeControl(mixer, MIXERLINE_COMPONENTTYPE_DST_SPEAKERS,type,out volCtrl, out currentVol);if(vVolume != currentVol){throw new Exception("Cannot Set Volume");}mixerClose(mixer);}}

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