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| uses MMSystem
function TMain.GetWaveVolume(var LVol: DWORD; var RVol: DWORD): Boolean;
var
WaveOutCaps: TWAVEOUTCAPS;
Volume: DWORD;
begin
Result := False;
if WaveOutGetDevCaps(WAVE_MAPPER, @WaveOutCaps, SizeOf(WaveOutCaps)) = MMSYSERR_NOERROR then
if WaveOutCaps.dwSupport and WAVECAPS_VOLUME = WAVECAPS_VOLUME then
begin
Result := WaveOutGetVolume(WAVE_MAPPER, @Volume) = MMSYSERR_NOERROR;
LVol := LoWord(Volume);
RVol := HiWord(Volume);
end;
end;
function TMain.SetWaveVolume(const AVolume: DWORD): Boolean;
var
WaveOutCaps: TWAVEOUTCAPS;
begin
Result := False;
if WaveOutGetDevCaps(WAVE_MAPPER, @WaveOutCaps, SizeOf(WaveOutCaps)) = MMSYSERR_NOERROR then
if WaveOutCaps.dwSupport and WAVECAPS_VOLUME = WAVECAPS_VOLUME then
Result := WaveOutSetVolume(WAVE_MAPPER, AVolume) = MMSYSERR_NOERROR;
end;
var
LVol: DWORD;
RVol: DWORD;
begin
GetWaveVolume(LVol, RVol)
end;
var
iVol: Integer;
iVol2: Integer;
begin
SetWaveVolume(MakeLong(iVol, iVol2));
end; |