[DELPHI] - Get CPU Usage

Code:

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uses
  Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs,
  ComCtrls, CommCtrl, StdCtrls, Menus,WinSpool, ExtCtrls, Buttons, Registry;

type
  TForm1 = class(TForm)
    Button1: TButton;
    Label1: TLabel;
    Label2: TLabel;
    Timer1: TTimer;
    Button2: TButton;
    procedure Button1Click(Sender: TObject);
    procedure Button2Click(Sender: TObject);
    procedure Timer1Timer(Sender: TObject);
  private
    { Private declarations }
    started : boolean;
    reg : TRegistry;
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.DFM}

procedure TForm1.Button1Click(Sender: TObject);
var
  Dummy : array[0..1024] of byte;
begin

  Reg:=TRegistry.Create;
  Reg.RootKey:=HKEY_DYN_DATA; topic
  Reg.OpenKey('PerfStats\StartStat',false)
  Reg.ReadBinaryData('KERNEL\CPUUsage',Dummy,Sizeof(Dummy));
  Reg.CloseKey;
  started:=true;
end;

procedure TForm1.Timer1Timer(Sender: TObject);
var
  CPUU : integer;
begin
  if started then
  begin
    Reg.OpenKey('PerfStats\StatData',false);
    Reg.ReadBinaryData('KERNEL\CPUUsage',CPUU,SizeOf(Integer));
    Reg.CloseKey;
    Label1.Caption:=IntToStr(CPUU)+'%';
  end;
end;

procedure TForm1.Button2Click(Sender: TObject);
var
  Dummy : array[0..1024] of byte;
begin
  Reg.OpenKey('PerfStats\StopStat',false);
  Reg.ReadBinaryData('KERNEL\CPUUsage',Dummy,SizeOf(Dummy));
  Reg.Free;
  Started:=false;
end;

end.

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