delphi控制系统音频设置!

[sgw520]

如何通过编程实现勾选“录音控制”中的选项,比如勾选“麦克风”或“立体声混音”。
网上搜到有用Mixer API函数控制音量，但不知道能不能达到上面的要求!
请各位大哥、大姐、大叔、大妈、大侠们给个例子。

[liuhengwinner]

可以实现的，这是以前的代码，摘出一段

uses
MMSystem

type
Tvolume=record // 控制主音量
left,right:word; // 取值范围 0--65535
end;
TVolumeRec = record //mic
case Integer of
0: (LongVolume: Longint) ;
1: (LeftVolume, RightVolume : Word) ;
end;

procedure SetMicVolume(aValue: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
// Uberprufen, ob ein Mixer vorhanden
nMixerDevs := mixerGetNumDevs();
if (nMixerDevs < 1) then
begin
Exit;
end;
// open the mixer
intRet := mixerOpen(@hMix, 0, 0, 0, 0);
if intRet <> MMSYSERR_NOERROR then Exit;
Try
mxl.dwComponentType := MIXERLINE_COMPONENTTYPE_SRC_MICROPHONE;
mxl.cbStruct := SizeOf(mxl);
// get line info
intRet := mixerGetLineInfo(hMix, @mxl, MIXER_GETLINEINFOF_COMPONENTTYPE);
if intRet = MMSYSERR_NOERROR then
begin
ZeroMemory(@mxlc, SizeOf(mxlc));
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
ZeroMemory(@mxcd, SizeOf(mxcd));
mxcd.dwControlID := mxc.dwControlID;
mxcd.cbStruct := SizeOf(mxcd);
mxcd.cMultipleItems := 0;
mxcd.cbDetails := SizeOf(Vol);
mxcd.paDetails := @vol;
mxcd.cChannels := 1;
// vol.dwValue := mxlc.pamxctrl.Bounds.lMinimum; Set min. Volume / Minimum setzen
// vol.dwValue := mxlc.pamxctrl.Bounds.lMaximum; Set max. Volume / Maximum setzen
vol.dwValue := aValue;
intRet := mixerSetControlDetails(hMix, @mxcd,
MIXER_SETCONTROLDETAILSF_VALUE);
if intRet <> MMSYSERR_NOERROR then Raise Exception.Create('SetControlDetails Error');
end else Raise Exception.Create('SetControlDetails Error');
end;
finally
intRet := mixerClose(hMix);
end;
end;

function GetMicVolume:Cardinal;
var Vol: TVolumeRec;
begin
AuxGetVolume(UINT(4),@Vol.LongVolume) ;
Result:=(Vol.LeftVolume + Vol.RightVolume) shr 9;
end;

function SetMicrophoneVolume(bValue: Word): Boolean;
var {0..65535}
hMix: HMIXER;
mxlc: MIXERLINECONTROLS;
mxcd: TMIXERCONTROLDETAILS;
vol: TMIXERCONTROLDETAILS_UNSIGNED;
mxc: MIXERCONTROL;
mxl: TMixerLine;
intRet: Integer;
nMixerDevs: Integer;
begin
// Check if Mixer is available
// ??berprüfen, ob ein Mixer vorhanden
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
mxl.dwComponentType := MIXERLINE_COMPONENTTYPE_SRC_MICROPHONE;
mxl.cbStruct := SizeOf(mxl);

// get line info
intRet := mixerGetLineInfo(hMix, @mxl, MIXER_GETLINEINFOF_COMPONENTTYPE);

if intRet = MMSYSERR_NOERROR then
begin
ZeroMemory(@mxlc, SizeOf(mxlc));
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
{
// Microphone Name
Label1.Caption := mxlc.pamxctrl.szName;

// Min/Max Volume
Label2.Caption := IntToStr(mxc.Bounds.dwMinimum) + '->' + IntToStr(mxc.Bounds.dwMaximum);
}
ZeroMemory(@mxcd, SizeOf(mxcd));
mxcd.dwControlID := mxc.dwControlID;
mxcd.cbStruct := SizeOf(mxcd);
mxcd.cMultipleItems := 0;
mxcd.cbDetails := SizeOf(Vol);
mxcd.paDetails := @vol;
mxcd.cChannels := 1;

// vol.dwValue := mxlc.pamxctrl.Bounds.lMinimum; Set min. Volume / Minimum setzen
// vol.dwValue := mxlc.pamxctrl.Bounds.lMaximum; Set max. Volume / Maximum setzen
vol.dwValue := bValue;

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;

[sgw520]

1楼,我要的是勾选“麦克风”或“立体声混音”。 不是控制音量.