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Ställa in volymen
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Kategori: Multimedia
Inlagt: 2002-09-03
Läst: 1297
Inlagt av: Staffan Berg
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Beskrivning |
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Ett kodexempel som ställer in mastervolymen till ditt ljudprogram.
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Kod |
interface
uses
SysUtils, Windows, MMSystem;
procedure SetMasterVolume(Mixer: hMixerObj; Value: Word);
implementation
function GetMasterVolumeControl( Mixer: hMixerObj; var Control: TMixerControl): MMResult;
//Returns True on success
var
Line: TMixerLine;
Controls: TMixerLineControls;
begin
ZeroMemory(@Line, SizeOf(Line));
Line.cbStruct := SizeOf(Line);
Line.dwComponentType := MIXERLINE_COMPONENTTYPE_DST_SPEAKERS;
Result := mixerGetLineInfo(Mixer, @Line, MIXER_GETLINEINFOF_COMPONENTTYPE);
if Result = MMSYSERR_NOERROR then
begin
ZeroMemory(@Controls, SizeOf(Controls));
Controls.cbStruct := SizeOf(Controls);
Controls.dwLineID := Line.dwLineID;
Controls.cControls := 1;
Controls.dwControlType := MIXERCONTROL_CONTROLTYPE_VOLUME;
Controls.cbmxctrl := SizeOf(Control);
Controls.pamxctrl := @Control;
Result := mixerGetLineControls(Mixer, @Controls, MIXER_GETLINECONTROLSF_ONEBYTYPE);
end;
end;
procedure SetMasterVolume(Mixer: hMixerObj; Value: Word);
var
MasterVolume: TMixerControl;
Details: TMixerControlDetails;
UnsignedDetails: TMixerControlDetailsUnsigned;
Code: MMResult;
begin
Code := GetMasterVolumeControl(Mixer, MasterVolume);
if Code = MMSYSERR_NOERROR then
begin
with Details do
begin
cbStruct := SizeOf(Details);
dwControlID := MasterVolume.dwControlID;
cChannels := 1; {set all channels}
cMultipleItems := 0;
cbDetails := SizeOf(UnsignedDetails);
paDetails := @UnsignedDetails;
end;
UnsignedDetails.dwValue := Value;
Code := mixerSetControlDetails(Mixer, @Details, MIXER_SETCONTROLDETAILSF_VALUE);
end;
if Code <> MMSYSERR_NOERROR then
raise Exception.CreateFmt('SetMasterVolume failure, ' + 'multimedia system error #%d', [Code]);
end;
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