如何以编程方式控制我的电脑的音量？
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【中文标题】如何以编程方式控制我的电脑的音量？【英文标题】：How to programmatically control the volume of my pc? 【发布时间】：2011-01-23 11:50:31 【问题描述】：我有一个没有 music 键的键盘，用于在我的 PC 中调高和调低音乐的音量、播放、停止等。如果你不明白，this 是我的键盘，this 不是。
我想在 Windows 和 Delphi 或 C# 中实现一个键盘挂钩来在我的键盘中创建音量功能，但我不知道如何通过代码调高和调低它。我正在尝试this 和this 示例，但没有奏效（顺便说一句，全部在Delphi 中）。
你知道如何通过代码调高和调低音量吗？
【问题讨论】：
一些您可能想阅读的文章：codeguru.com/csharp/csharp/cs_graphics/sound/article.php/c10931dreamincode.net/forums/index.php?showtopic=45693 【参考方案1】：delphi 代码如下。
我的 keyhook 向我的主窗体发送一条消息，其中包含 LParam 中的密钥 VK 代码，
procedure TmainFrm.keyHook(var msg: TMessage);
begin
case msg.LParam of
VK_VOLUME_UP : g_mixer.volume := g_mixer.volume + 2048;
VK_VOLUME_DOWN: g_mixer.volume := g_mixer.volume - 2048;
VK_VOLUME_MUTE: g_mixer.muted := not g_mixer.muted;
end;
end;
音量范围是 0 .. 65535;带外值会被静默纠正。
-
unit Mixer;
interface
type
Tmixer = class
protected
function getMute: boolean; virtual; abstract;
function getVolume: integer; virtual; abstract;
procedure setVolume(Value: integer); virtual; abstract;
procedure setMute(Value: boolean); virtual; abstract;
public
property volume: integer read getVolume write setVolume;
property muted: boolean read getMute write setMute;
end;
function g_mixer: Tmixer;
implementation
uses
Windows, MMSystem, MMDevApi_tlb, ComObj, ActiveX, SysUtils;
// ---------------------------------------------------------------------------
type
TxpMixer = class(Tmixer)
private
Fmxct: integer;
Fmixer: HMIXER;
procedure chk(r: MMRESULT);
protected
function getMute: boolean; override;
function getVolume: integer; override;
procedure setVolume(Value: integer); override;
procedure setMute(Value: boolean); override;
public
constructor Create;
destructor Destroy; override;
end;
TvistaMixer = class(Tmixer)
private
FmmDev: IMMDevice;
FmmDevEnum: IMMDeviceEnumerator;
FmmEndpoint: IMMAudioEndpointVolume;
protected
function getMute: boolean; override;
function getVolume: integer; override;
procedure setVolume(Value: integer); override;
procedure setMute(Value: boolean); override;
public
constructor Create;
end;
// ---------------------------------------------------------------------------
var
_g_mixer: Tmixer;
function g_mixer: Tmixer;
var
VerInfo: TOSVersioninfo;
begin
if (_g_mixer = nil) then
begin
VerInfo.dwOSVersionInfoSize := SizeOf(TOSVersionInfo);
GetVersionEx(VerInfo);
if (VerInfo.dwMajorVersion >= 6) then
_g_mixer := TvistaMixer.Create
else
_g_mixer := TxpMixer.Create;
end;
result := _g_mixer;
end;
// ---------------------------------------------------------------------------
TxpMixer
procedure TxpMixer.chk(r: MMRESULT);
var
s: string;
begin
if (r = MMSYSERR_NOERROR) then
exit;
setLength(s, MMSystem.MAXERRORLENGTH + 1);
waveOutGetErrorText(r, @s[1], MMSystem.MAXERRORLENGTH);
raise Exception.Create(StrPas(pChar(s)));
end;
// ---------------------------------------------------------------------------
constructor TxpMixer.Create;
begin
Fmxct := MIXERLINE_COMPONENTTYPE_DST_SPEAKERS;
chk(mixerOpen(@Fmixer, 0, 0, 0, 0));
end;
// ---------------------------------------------------------------------------
destructor TxpMixer.Destroy;
begin
if (Fmixer <> 0) then
mixerClose(Fmixer);
inherited;
end;
// ---------------------------------------------------------------------------
function TxpMixer.getMute: boolean;
var
MasterMute: TMixerControl;
Details: TMixerControlDetails;
BoolDetails: TMixerControlDetailsBoolean;
Line: TMixerLine;
Controls: TMixerLineControls;
begin
ZeroMemory(@Line, SizeOf(Line));
Line.cbStruct := SizeOf(Line);
Line.dwComponentType := Fmxct;
chk(mixerGetLineInfo(0, @Line, MIXER_GETLINEINFOF_COMPONENTTYPE));
ZeroMemory(@Controls, SizeOf(Controls));
Controls.cbStruct := SizeOf(Controls);
Controls.dwLineID := Line.dwLineID;
Controls.cControls := 1;
Controls.dwControlType := MIXERCONTROL_CONTROLTYPE_MUTE;
Controls.cbmxctrl := SizeOf(MasterMute);
Controls.pamxctrl := @MasterMute;
chk(mixerGetLineControls(0, @Controls, MIXER_GETLINECONTROLSF_ONEBYTYPE));
Details.cbStruct := SizeOf(Details);
Details.dwControlID := MasterMute.dwControlID;
Details.cChannels := 1;
Details.cMultipleItems := 0;
Details.cbDetails := SizeOf(BoolDetails);
Details.paDetails := @BoolDetails;
chk(mixerGetControlDetails(0, @Details, MIXER_GETCONTROLDETAILSF_VALUE));
result := BoolDetails.fValue <> 0;
end;
// ---------------------------------------------------------------------------
function TxpMixer.getVolume: integer;
var
Line: TMixerLine;
Controls: TMixerLineControls;
MasterVolume: TMixerControl;
Details: TMixerControlDetails;
UnsignedDetails: TMixerControlDetailsUnsigned;
begin
ZeroMemory(@Line, SizeOf(Line));
Line.cbStruct := SizeOf(Line);
Line.dwComponentType := Fmxct;
chk(mixerGetLineInfo(Fmixer, @Line, MIXER_GETLINEINFOF_COMPONENTTYPE));
ZeroMemory(@Controls, SizeOf(Controls));
Controls.cbStruct := SizeOf(Controls);
Controls.dwLineID := Line.dwLineID;
Controls.cControls := 1;
Controls.dwControlType := MIXERCONTROL_CONTROLTYPE_VOLUME;
Controls.cbmxctrl := SizeOf(MasterVolume);
Controls.pamxctrl := @MasterVolume;
chk(mixerGetLineControls(Fmixer, @Controls, MIXER_GETLINECONTROLSF_ONEBYTYPE));
details.cbStruct := SizeOf(Details);
details.dwControlID := MasterVolume.dwControlID;
details.cChannels := 1;
details.cMultipleItems := 0;
details.cbDetails := SizeOf(UnsignedDetails);
details.paDetails := @UnsignedDetails;
chk(mixerGetControlDetails(Fmixer, @Details, MIXER_GETCONTROLDETAILSF_VALUE));
result := UnsignedDetails.dwValue;
end;
// ---------------------------------------------------------------------------
procedure TxpMixer.setMute(Value: boolean);
var
Line: TMixerLine;
Controls: TMixerLineControls;
MasterMute: TMixerControl;
Details: TMixerControlDetails;
BoolDetails: TMixerControlDetailsBoolean;
begin
ZeroMemory(@Line, SizeOf(Line));
Line.cbStruct := SizeOf(Line);
Line.dwComponentType := Fmxct;
chk(mixerGetLineInfo(Fmixer, @Line, MIXER_GETLINEINFOF_COMPONENTTYPE));
ZeroMemory(@Controls, SizeOf(Controls));
Controls.cbStruct := SizeOf(Controls);
Controls.dwLineID := Line.dwLineID;
Controls.cControls := 1;
Controls.dwControlType := MIXERCONTROL_CONTROLTYPE_MUTE;
Controls.cbmxctrl := SizeOf(masterMute);
Controls.pamxctrl := @masterMute;
chk(mixerGetLineControls(Fmixer, @Controls, MIXER_GETLINECONTROLSF_ONEBYTYPE));
details.cbStruct := SizeOf(Details);
details.dwControlID := MasterMute.dwControlID;
details.cChannels := 1;
details.cMultipleItems := 0;
details.cbDetails := SizeOf(BoolDetails);
details.paDetails := @BoolDetails;
mixerGetControlDetails(0, @Details, MIXER_GETCONTROLDETAILSF_VALUE);
if (Value) then
BoolDetails.fValue := 1
else
BoolDetails.fValue := 0;
chk(mixerSetControlDetails(0, @Details, MIXER_SETCONTROLDETAILSF_VALUE));
end;
// ---------------------------------------------------------------------------
procedure TxpMixer.setVolume(Value: integer);
var
Line: TMixerLine;
Controls: TMixerLineControls;
MasterVolume: TMixerControl;
Details: TMixerControlDetails;
UnsignedDetails: TMixerControlDetailsUnsigned;
begin
if (value < 0) then
value := 0;
if (value > 65535) then
value := 65535;
ZeroMemory(@Line, SizeOf(Line));
Line.cbStruct := SizeOf(Line);
Line.dwComponentType := Fmxct;
chk(mixerGetLineInfo(Fmixer, @Line, MIXER_GETLINEINFOF_COMPONENTTYPE));
ZeroMemory(@Controls, SizeOf(Controls));
Controls.cbStruct := SizeOf(Controls);
Controls.dwLineID := Line.dwLineID;
Controls.cControls := 1;
Controls.dwControlType := MIXERCONTROL_CONTROLTYPE_VOLUME;
Controls.cbmxctrl := SizeOf(MasterVolume);
Controls.pamxctrl := @MasterVolume;
chk(mixerGetLineControls(Fmixer, @Controls, MIXER_GETLINECONTROLSF_ONEBYTYPE));
details.cbStruct := SizeOf(Details);
details.dwControlID := MasterVolume.dwControlID;
details.cChannels := 1;
details.cMultipleItems := 0;
details.cbDetails := SizeOf(UnsignedDetails);
details.paDetails := @UnsignedDetails;
UnsignedDetails.dwValue := Value;
chk(mixerSetControlDetails(Fmixer, @Details, MIXER_SETCONTROLDETAILSF_VALUE));
end;
// ---------------------------------------------------------------------------
TvistaMixer
constructor TvistaMixer.Create;
begin
CoCreateInstance(CLSID_MMDeviceEnumerator, nil, CLSCTX_ALL, IID_IMMDeviceEnumerator, FmmDevEnum);
FmmDevEnum.GetDefaultAudioEndpoint(eRender, eMultimedia, FmmDev);
FmmDev.Activate(IID_IAudioEndpointVolume, CLSCTX_ALL, nil, FmmEndpoint);
end;
// ---------------------------------------------------------------------------
function TvistaMixer.getMute: boolean;
begin
FmmEndpoint.GetMute(Result);
end;
// ---------------------------------------------------------------------------
function TvistaMixer.getVolume: integer;
var
VolLevel: Single;
begin
FmmEndpoint.GetMasterVolumeLevelScalar(VolLevel);
result := Round(VolLevel * 65535);
end;
// ---------------------------------------------------------------------------
procedure TvistaMixer.setMute(Value: boolean);
begin
FmmEndpoint.SetMute(Value, nil);
end;
// ---------------------------------------------------------------------------
procedure TvistaMixer.setVolume(Value: integer);
var
fValue: Single;
begin
if (value < 0) then
value := 0;
if (value > 65535) then
value := 65535;
fValue := Value / 65535;
FmmEndpoint.SetMasterVolumeLevelScalar(fValue, nil);
end;
// ---------------------------------------------------------------------------
end.
-
unit MMDevApi_tlb;
interface
uses Windows, ActiveX, Classes, Graphics, OleServer, OleCtrls, StdVCL,ComObj;
const
// TypeLibrary Major and minor versions
CLSID_MMDeviceEnumerator: TGUID = 'BCDE0395-E52F-467C-8E3D-C4579291692E';
IID_IMMDeviceEnumerator: TGUID = 'A95664D2-9614-4F35-A746-DE8DB63617E6';
IID_IMMDevice: TGUID = 'D666063F-1587-4E43-81F1-B948E807363F';
IID_IMMDeviceCollection: TGUID = '0BD7A1BE-7A1A-44DB-8397-CC5392387B5E';
IID_IAudioEndpointVolume: TGUID = '5CDF2C82-841E-4546-9722-0CF74078229A';
IID_IAudioMeterInformation : TGUID = 'C02216F6-8C67-4B5B-9D00-D008E73E0064';
IID_IAudioEndpointVolumeCallback: TGUID = '657804FA-D6AD-4496-8A60-352752AF4F89';
GUID_NULL: TGUID = '00000000-0000-0000-0000-000000000000';
DEVICE_STATE_ACTIVE = $00000001;
DEVICE_STATE_UNPLUGGED = $00000002;
DEVICE_STATE_NOTPRESENT = $00000004;
DEVICE_STATEMASK_ALL = $00000007;
type
EDataFlow = TOleEnum;
const
eRender = $00000000;
eCapture = $00000001;
eAll = $00000002;
EDataFlow_enum_count = $00000003;
type
ERole = TOleEnum;
const
eConsole = $00000000;
eMultimedia = $00000001;
eCommunications = $00000002;
ERole_enum_count = $00000003;
type
IAudioEndpointVolumeCallback = interface(IUnknown)
['657804FA-D6AD-4496-8A60-352752AF4F89']
end;
IMMAudioEndpointVolume = interface(IUnknown)
['5CDF2C82-841E-4546-9722-0CF74078229A']
Function RegisterControlChangeNotify( AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;
Function UnregisterControlChangeNotify( AudioEndPtVol: IAudioEndpointVolumeCallback): Integer; stdcall;
Function GetChannelCount(out PInteger): Integer; stdcall;
Function SetMasterVolumeLevel(fLevelDB: single; pguidEventContext: PGUID):Integer; stdcall;
Function SetMasterVolumeLevelScalar(fLevelDB: single; pguidEventContext: PGUID):Integer; stdcall;
Function GetMasterVolumeLevel(out fLevelDB: single):Integer; stdcall;
Function GetMasterVolumeLevelScalar(out fLevel: single):Integer; stdcall;
Function SetChannelVolumeLevel(nChannel: Integer; fLevelDB: double; pguidEventContext: TGUID):Integer; stdcall;
Function SetChannelVolumeLevelScalar(nChannel: Integer; fLevelDB: single; pguidEventContext: TGUID):Integer; stdcall;
Function GetChannelVolumeLevel(nChannel: Integer; out fLevelDB: double) : Integer; stdcall;
Function GetChannelVolumeLevelScalar(nChannel: Integer; out fLevel: double) : Integer; stdcall;
Function SetMute(bMute: Boolean ; pguidEventContext: PGUID) :Integer; stdcall;
Function GetMute(out bMute: Boolean ) :Integer; stdcall;
Function GetVolumeStepInfo( pnStep: Integer; out pnStepCount: Integer):Integer; stdcall;
Function VolumeStepUp(pguidEventContext: TGUID) :Integer; stdcall;
Function VolumeStepDown(pguidEventContext: TGUID) :Integer; stdcall;
Function QueryHardwareSupport(out pdwHardwareSupportMask): Integer; stdcall;
Function GetVolumeRange(out pflVolumeMindB: double; out pflVolumeMaxdB: double; out pflVolumeIncrementdB: double): Integer; stdcall;
end;
IPropertyStore = interface(IUnknown)
end;
type
IMMDevice = interface(IUnknown)
['D666063F-1587-4E43-81F1-B948E807363F']
Function Activate( const refId :TGUID;
dwClsCtx: DWORD;
pActivationParams: PInteger ;
out pEndpointVolume: IMMAudioEndpointVolume): Hresult; stdCall;
Function OpenPropertyStore(stgmAccess: DWORD; out ppProperties :IPropertyStore): Hresult; stdcall;
Function GetId(out ppstrId: PLPWSTR ): Hresult; stdcall;
Function GetState(out State :Integer): Hresult; stdcall;
end;
IMMDeviceCollection = interface(IUnknown)
['0BD7A1BE-7A1A-44DB-8397-CC5392387B5E']
end;
IMMNotificationClient = interface (IUnknown)
['7991EEC9-7E89-4D85-8390-6C703CEC60C0']
end;
IMMDeviceEnumerator = interface(IUnknown)
['A95664D2-9614-4F35-A746-DE8DB63617E6']
Function EnumAudioEndpoints( dataFlow: EDataFlow; deviceState: SYSUINT; DevCollection:IMMDeviceCollection ): Hresult ; stdcall;
Function GetDefaultAudioEndpoint(EDF: SYSUINT; ER: SYSUINT; out Dev :IMMDevice ): Hresult ; stdcall;
Function GetDevice( pwstrId: pointer ; out Dev :IMMDevice) : HResult; stdcall;
Function RegisterEndpointNotificationCallback(pClient :IMMNotificationClient) :Hresult; stdcall;
end;
implementation
end.
【讨论】：
【参考方案2】：Autohotkey 可以解决问题。它有一个“SoundSet”命令，可以调整所有音频设备的音量/静音级别。
【讨论】：
它仍然需要编写一些脚本 - 如果您四处寻找，可能已经有人创建了自动热键脚本。 不错！！^!NumpadSub::Send Volume_Up 10^!NumpadAdd::Send Volume_Down 10^!NumpadEnter::Send Volume_Mute【参考方案3】：
这是对 glob 出色答案的补充。 SetMute/GetMute 函数声明必须使用 32 位整数值
unit MMDevApi_tlb;
const
DEVICE_STATE_ACTIVE = $00000001;
DEVICE_STATE_UNPLUGGED = $00000002;
DEVICE_STATE_NOTPRESENT = $00000004;
DEVICE_STATEMASK_ALL = $00000007;
IMMAudioEndpointVolume = interface(IUnknown)
['5CDF2C82-841E-4546-9722-0CF74078229A']
Function SetMute(iMute: Integer; pguidEventContext: PGUID) :Integer; stdcall;
Function GetMute(out iMute: Integer) :Integer; stdcall;
更改 SetMute 和 GetMute 声明以使用整数变量并将 Delphi 布尔值转换为整数。
然后是方法调用 变量 iMute：整数 AudioEndVol.SetMute(Integer(CheckBox1.Checked), @GUID_NULL); AudioEndVol.GetMute(iMute);
使用 bool 不会使托盘图标正确识别静音状态，并且 unmute 根本不起作用。 getmute 也是如此，它必须使用 32 位整数输出参数，否则内存对齐会随机损坏。我不明白一个推理，所以在谷歌上搜索并找到了一篇很棒的 JEDI 文章。
一些 win32 调用对按位值非常挑剔，Delphi Bool/Boolean 并不总是与 C 对应项配合得很好。使用 32 位整数来表示 C bool 变量以进行精确的按位匹配。大多数 win32 C 方法并不那么严格，并且可以与 bool/boolean 一起正常工作。这个特定的 MMDeviceAPI.SetMute 函数是一种罕见的极端情况，Delphi 程序员受到重创。 http://blog.delphi-jedi.net/2008/09/25/bool-boolean-and-integer/
【讨论】：
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