调节音量的方法我已查出,不是采用楼上的这些方法,楼上的方法我感觉不是很好.我感觉比较好的方法如下(可以控制Master, Microphone, WaveOut, Synth):
//在进行多媒体软件开发时,经常要调整各种设备的音量和设置静音,有人编写了一个单元,四个函数,分别用于获取音量(GetVolume(DN))、设置音量(SetVolume(DN,Value))、获取静音(GetVolumeMute(DN))及设置静音(SetVolumeMute(DN,Value))。
unit funVolume;
interface
uses MMSystem, Dialogs;
Type TDeviceName = (Master, Microphone, WaveOut, Synth);
function GetVolume(DN:TDeviceName) : Word ;
//获取音量 (0~65535)
procedure SetVolume(DN:TDeviceName;
Value:Word);
//设置音量
function GetVolumeMute(DN:TDeviceName) : Boolean;
//获取静音
procedure SetVolumeMute(DN:TDeviceName;
Value:Boolean);
//设置静音
implementation
//获取音量
function GetVolume(DN:TDeviceName) : Word;
var
hMix: HMIXER;
mxlc: MIXERLINECONTROLS;
mxcd: TMIXERCONTROLDETAILS;
vol: TMIXERCONTROLDETAILS_UNSIGNED;
mxc: MIXERCONTROL;
mxl: TMixerLine;
intRet: Integer;
nMixerDevs: Integer;
begin
// Check if Mixer is available
nMixerDevs := mixerGetNumDevs();
if (nMixerDevs < 1) then
begin
Exit;
end;
// open the mixer
intRet := mixerOpen(@hMix, 0, 0, 0, 0);
if intRet = MMSYSERR_NOERROR then
begin
case DN of
Master : mxl.dwComponentType := MIXERLINE_COMPONENTTYPE_DST_SPEAKERS;
Microphone :
mxl.dwComponentType := MIXERLINE_COMPONENTTYPE_SRC_MICROPHONE;
WaveOut : mxl.dwComponentType := MIXERLINE_COMPONENTTYPE_SRC_WAVEOUT;
Synth : mxl.dwComponentType := MIXERLINE_COMPONENTTYPE_SRC_SYNTHESIZER;
end;
mxl.cbStruct := SizeOf(mxl);
// get line info
intRet := mixerGetLineInfo(hMix, @mxl, MIXER_GETLINEINFOF_COMPONENTTYPE);
if intRet = MMSYSERR_NOERROR then
begin
FillChar(mxlc, SizeOf(mxlc),0);
mxlc.cbStruct := SizeOf(mxlc);
mxlc.dwLineID := mxl.dwLineID;
mxlc.dwControlType := MIXERCONTROL_CONTROLTYPE_VOLUME;
mxlc.cControls := 1;
mxlc.cbmxctrl := SizeOf(mxc);
mxlc.pamxctrl := @mxc;
intRet := mixerGetLineControls(hMix, @mxlc, MIXER_GETLINECONTROLSF_ONEBYTYPE);
if intRet = MMSYSERR_NOERROR then
begin
FillChar(mxcd, SizeOf(mxcd),0);
mxcd.dwControlID := mxc.dwControlID;
mxcd.cbStruct := SizeOf(mxcd);
mxcd.cMultipleItems := 0;
mxcd.cbDetails := SizeOf(Vol);
mxcd.paDetails := @vol;
mxcd.cChannels := 1;
intRet := mixerGetControlDetails(hMix, @mxcd,MIXER_SETCONTROLDETAILSF_VALUE);
Result := vol.dwValue ;
if intRet <> MMSYSERR_NOERROR then
ShowMessage('GetControlDetails Error');
end
else
ShowMessage('GetLineInfo Error');
end;
intRet := mixerClose(hMix);
end;
end;
//设置音量
procedure setVolume(DN:TDeviceName;
Value : Word);
var
hMix: HMIXER;
mxlc: MIXERLINECONTROLS;
mxcd: TMIXERCONTROLDETAILS;
vol: TMIXERCONTROLDETAILS_UNSIGNED;
mxc: MIXERCONTROL;
mxl: TMixerLine;
intRet: Integer;
nMixerDevs: Integer;
begin
// Check if Mixer is available
nMixerDevs := mixerGetNumDevs();
if (nMixerDevs < 1) then
begin
Exit;
end;
// open the mixer
intRet := mixerOpen(@hMix, 0, 0, 0, 0);
if intRet = MMSYSERR_NOERROR then
begin
case DN of
Master : mxl.dwComponentType := MIXERLINE_COMPONENTTYPE_DST_SPEAKERS;
Microphone :
mxl.dwComponentType := MIXERLINE_COMPONENTTYPE_SRC_MICROPHONE;
WaveOut : mxl.dwComponentType := MIXERLINE_COMPONENTTYPE_SRC_WAVEOUT;
Synth : mxl.dwComponentType := MIXERLINE_COMPONENTTYPE_SRC_SYNTHESIZER;
end;
mxl.cbStruct := SizeOf(mxl);
// get line info
intRet := mixerGetLineInfo(hMix, @mxl, MIXER_GETLINEINFOF_COMPONENTTYPE);
if intRet = MMSYSERR_NOERROR then
begin
FillChar(mxlc, SizeOf(mxlc),0);
mxlc.cbStruct := SizeOf(mxlc);
mxlc.dwLineID := mxl.dwLineID;
mxlc.dwControlType := MIXERCONTROL_CONTROLTYPE_VOLUME;
mxlc.cControls := 1;
mxlc.cbmxctrl := SizeOf(mxc);
mxlc.pamxctrl := @mxc;
intRet := mixerGetLineControls(hMix, @mxlc, MIXER_GETLINECONTROLSF_ONEBYTYPE);
if intRet = MMSYSERR_NOERROR then
begin
FillChar(mxcd, SizeOf(mxcd),0);
mxcd.dwControlID := mxc.dwControlID;
mxcd.cbStruct := SizeOf(mxcd);
mxcd.cMultipleItems := 0;
mxcd.cbDetails := SizeOf(Vol);
mxcd.paDetails := @vol;
mxcd.cChannels := 1;
vol.dwValue := Value;
intRet := mixerSetControlDetails(hMix, @mxcd,MIXER_SETCONTROLDETAILSF_VALUE);
if intRet <> MMSYSERR_NOERROR then
ShowMessage('SetControlDetails Error');
end
else
ShowMessage('GetLineInfo Error');
end;
intRet := mixerClose(hMix);
end;
end;
//获取静音
function GetVolumeMute(DN:TDeviceName) : Boolean;
var
hMix: HMIXER;
mxlc: MIXERLINECONTROLS;
mxcd: TMIXERCONTROLDETAILS;
vol: TMIXERCONTROLDETAILS_UNSIGNED;
mxc: MIXERCONTROL;
mxl: TMixerLine;
intRet: Integer;
nMixerDevs: Integer;
mcdMute: MIXERCONTROLDETAILS_BOOLEAN;
begin
// Check if Mixer is available
nMixerDevs := mixerGetNumDevs();
if (nMixerDevs < 1) then
begin
Exit;
end;
// open the mixer
intRet := mixerOpen(@hMix, 0, 0, 0, 0);
if intRet = MMSYSERR_NOERROR then
begin
case DN of
Master : mxl.dwComponentType := MIXERLINE_COMPONENTTYPE_DST_SPEAKERS;
Microphone :
mxl.dwComponentType := MIXERLINE_COMPONENTTYPE_SRC_MICROPHONE;
WaveOut : mxl.dwComponentType := MIXERLINE_COMPONENTTYPE_SRC_WAVEOUT;
Synth : mxl.dwComponentType := MIXERLINE_COMPONENTTYPE_SRC_SYNTHESIZER;
end;
mxl.cbStruct := SizeOf(mxl);
// mixerline info
intRet := mixerGetLineInfo(hMix, @mxl, MIXER_GETLINEINFOF_COMPONENTTYPE);
if intRet = MMSYSERR_NOERROR then
begin
FillChar(mxlc, SizeOf(mxlc),0);
mxlc.cbStruct := SizeOf(mxlc);
mxlc.dwLineID := mxl.dwLineID;
mxlc.dwControlType := MIXERCONTROL_CONTROLTYPE_MUTE;
mxlc.cControls := 1;
mxlc.cbmxctrl := SizeOf(mxc);
mxlc.pamxctrl := @mxc;
// Get the mute control
intRet := mixerGetLineControls(hMix, @mxlc, MIXER_GETLINECONTROLSF_ONEBYTYPE);
if intRet = MMSYSERR_NOERROR then
begin
FillChar(mxcd, SizeOf(mxcd),0);
mxcd.cbStruct := SizeOf(TMIXERCONTROLDETAILS);
mxcd.dwControlID := mxc.dwControlID;
mxcd.cChannels := 1;
mxcd.cbDetails := SizeOf(MIXERCONTROLDETAILS_BOOLEAN);
mxcd.paDetails := @mcdMute;
// Get mute
intRet := mixerGetControlDetails(hMix, @mxcd, MIXER_SETCONTROLDETAILSF_VALUE);
if mcdMute.fValue = 0 then
Result:=false
else
Result := True;
if intRet <> MMSYSERR_NOERROR then
ShowMessage('SetControlDetails Error');
end
else
ShowMessage('GetLineInfo Error');
end;
intRet := mixerClose(hMix);
end;
end;
//设置静音
procedure SetVolumeMute(DN:TDeviceName;
Value:Boolean);
var
hMix: HMIXER;
mxlc: MIXERLINECONTROLS;
mxcd: TMIXERCONTROLDETAILS;
vol: TMIXERCONTROLDETAILS_UNSIGNED;
mxc: MIXERCONTROL;
mxl: TMixerLine;
intRet: Integer;
nMixerDevs: Integer;
mcdMute: MIXERCONTROLDETAILS_BOOLEAN;
begin
// Check if Mixer is available
nMixerDevs := mixerGetNumDevs();
if (nMixerDevs < 1) then
begin
Exit;
end;
// open the mixer
intRet := mixerOpen(@hMix, 0, 0, 0, 0);
if intRet = MMSYSERR_NOERROR then
begin
case DN of
Master : mxl.dwComponentType := MIXERLINE_COMPONENTTYPE_DST_SPEAKERS;
Microphone :
mxl.dwComponentType := MIXERLINE_COMPONENTTYPE_SRC_MICROPHONE;
WaveOut : mxl.dwComponentType := MIXERLINE_COMPONENTTYPE_SRC_WAVEOUT;
Synth : mxl.dwComponentType := MIXERLINE_COMPONENTTYPE_SRC_SYNTHESIZER;
end;
mxl.cbStruct := SizeOf(mxl);
// mixerline info
intRet := mixerGetLineInfo(hMix, @mxl, MIXER_GETLINEINFOF_COMPONENTTYPE);
if intRet = MMSYSERR_NOERROR then
begin
FillChar(mxlc, SizeOf(mxlc),0);
mxlc.cbStruct := SizeOf(mxlc);
mxlc.dwLineID := mxl.dwLineID;
mxlc.dwControlType := MIXERCONTROL_CONTROLTYPE_MUTE;
mxlc.cControls := 1;
mxlc.cbmxctrl := SizeOf(mxc);
mxlc.pamxctrl := @mxc;
// Get the mute control
intRet := mixerGetLineControls(hMix, @mxlc, MIXER_GETLINECONTROLSF_ONEBYTYPE);
if intRet = MMSYSERR_NOERROR then
begin
FillChar(mxcd, SizeOf(mxcd),0);
mxcd.cbStruct := SizeOf(TMIXERCONTROLDETAILS);
mxcd.dwControlID := mxc.dwControlID;
mxcd.cChannels := 1;
mxcd.cbDetails := SizeOf(MIXERCONTROLDETAILS_BOOLEAN);
mxcd.paDetails := @mcdMute;
// Set and UnSet mute
mcdMute.fValue := Ord(Value);
intRet := mixerSetControlDetails(hMix, @mxcd, MIXER_SETCONTROLDETAILSF_VALUE);
if intRet <> MMSYSERR_NOERROR then
ShowMessage('SetControlDetails Error');
end
else
ShowMessage('GetLineInfo Error');
end;
intRet := mixerClose(hMix);
end;
end;
end.