Win 2000

Denne kode virker kun under win 2000, ikke under win 98. Kan man få den til at virke under win 2000? Koden giver udslag i forhold til lyden. Her er koden:


{
  Every line going into and out of the mixer has a number of "controls"
  associated with it. Some of those controls are "meters," which give
  you a real-time value of the sound level on the corresponding line.
  Not all lines have meter controls, and not all sound cards provide
  support for meters.

  Here's some code that will retrieve a handle to the meter attached to
  the WaveOut source of the speaker line, if there is one:
}

uses
  MMSystem;

procedure TForm1.Button1Click(Sender: TObject);
var
  MixerControl: TMixerControl;
  MixerControlDetails: TMixerControlDetails;
  MixerControlDetailsSigned: TMixerControlDetailsSigned;
  Mixer: THandle;
  MixerLine: TMixerLine;
  MixerLineControls: TMixerLineControls;
  PeakMeter: DWORD;
  Rslt: DWORD;
  SourceCount: Cardinal;
  WaveOut: DWORD;
  I: Integer;
  X: Integer;
  Y: Integer;
begin
  Rslt := mixerOpen(@Mixer, 0, 0, 0, 0);
  if Rslt <> 0 then
    raise Exception.CreateFmt('Can''t open mixer (%d)', [Rslt]);
  FillChar(MixerLine, SizeOf(MixerLine), 0);
  MixerLine.cbStruct := SizeOf(MixerLine);
  MixerLine.dwComponentType := MIXERLINE_COMPONENTTYPE_DST_SPEAKERS;
  Rslt := mixerGetLineInfo(Mixer, @MixerLine,
    MIXER_GETLINEINFOF_COMPONENTTYPE);
  if Rslt <> 0 then
    raise Exception.CreateFmt('Can''t find speaker line (%d)', [Rslt]);
  SourceCount := MixerLine.cConnections;
  WaveOut := $FFFFFFFF;
  for I := 0 to SourceCount - 1 do
  begin
    MixerLine.dwSource := I;
    Rslt := mixerGetLineInfo(Mixer, @MixerLine,
      MIXER_GETLINEINFOF_SOURCE);
    if Rslt <> 0 then
      raise Exception.CreateFmt('Can''t get source line (%d)', [Rslt]);
    if MixerLine.dwComponentType = MIXERLINE_COMPONENTTYPE_SRC_WAVEOUT then
    begin
      WaveOut := MixerLine.dwLineId;
      Break;
    end;
  end;
  if WaveOut = $FFFFFFFF then
    raise Exception.Create('Can''t find wave out device');
  FillChar(MixerLineControls, SizeOf(MixerLineControls), 0);
  with MixerLineControls do
  begin
    cbStruct := SizeOf(MixerLineControls);
    dwLineId := WaveOut;
    dwControlType := MIXERCONTROL_CONTROLTYPE_PEAKMETER;
    cControls := 1;
    cbmxctrl := SizeOf(TMixerControl);
    pamxctrl := @MixerControl;
  end;
  Rslt := mixerGetLineControls(Mixer, @MixerLineControls,
    MIXER_GETLINECONTROLSF_ONEBYTYPE);
  if Rslt <> 0 then
    raise Exception.CreateFmt('Can''t find peak meter control (%d)',
      [Rslt]);
  PeakMeter := MixerControl.dwControlID;

  // at this point, I have the meter control ID, so I can
  // repeatedly query its value and plot the resulting data
  // on a canvas

  X := 0;
  FillChar(MixerControlDetails, SizeOf(MixerControlDetails), 0);
  with MixerControlDetails do
  begin
    cbStruct := SizeOf(MixerControlDetails);
    dwControlId := PeakMeter;
    cChannels := 1;
    cbDetails := SizeOf(MixerControlDetailsSigned);
    paDetails := @MixerControlDetailsSigned;
  end;
  repeat
    Sleep(10);
    Rslt := mixerGetControlDetails(Mixer, @MixerControlDetails,
      MIXER_GETCONTROLDETAILSF_VALUE);
    if Rslt <> 0 then
      raise Exception.CreateFmt('Can''t get control details (%d)',
        [Rslt]);
    Application.ProcessMessages;
    Inc(X);
    Y := 300 - Round(300 * Abs(MixerControlDetailsSigned.lValue) / 32768);
    with Canvas do
    begin
      MoveTo(X, 0);
      Pen.Color := clBtnFace;
      LineTo(X, 300);
      Pen.Color := clWindowText;
      LineTo(X, Y);
    end;
  until X > 500;

  // don't forget to close the mixer handle when you're done

  Rslt := mixerClose(Mixer);
  if Rslt <> 0 then
    raise Exception.CreateFmt('Can''t close mixer (%d)', [Rslt]);
end;



Kan nogen lave den om, så den virker under Win 2000, eller har nogen en alternativ måde til at få lyden til at give udslag. Det behøver ikke tegnes på formen det kan også bare være i en progressbar, så får han de 200 point.

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