【Roger Wo】在.NET程序中控制系统音量
在windows下控制系统音量，需要通过使用win32的WDM audio components（winmm.dll）来实现，为了方便起见，将其封装到了一个AudioMixerHelper类中，可以直接通过GetVolume()和SetVolume方法来改变音量。
using System; using System.Runtime.InteropServices; namespace Microsoft 
{ 
public 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,ref MIXERCONTROLDETAILS 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, &nbs
来自 “ ITPUB博客 ” ，链接：https://blog.itpub.net/12639172/viewspace-349324/ ，如需转载，请注明出处，否则将追究法律责任。
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