哎呀，怎么取得CPU的速度呀

[Moon80]

如题，提供源代码更好

[Wally_wu]

unit UCPUSpd;

interface

uses
Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs,
ComCtrls, StdCtrls, Buttons;

type
TFormCPUSpeed = class(TForm)
PageControl: TPageControl;
BitBtnStart: TBitBtn;
BitBtnStop: TBitBtn;
TabSheet: TTabSheet;
LabelCPUSpeed: TLabel;
LabelInfo: TLabel;
LabelWeb: TLabel;
procedure BitBtnStartClick(Sender: TObject);
procedure BitBtnStopClick(Sender: TObject);
private
{ Private declarations }
Stop: Boolean;
public
{ Public declarations }
end;

var
FormCPUSpeed: TFormCPUSpeed;

implementation

{$R *.DFM}

function GetCPUSpeed: Double;
const
DelayTime = 500; // measure time in ms
var
TimerHi, TimerLo: DWORD;
PriorityClass, Priority: Integer;
begin
PriorityClass := GetPriorityClass(GetCurrentProcess);
Priority := GetThreadPriority(GetCurrentThread);

SetPriorityClass(GetCurrentProcess, REALTIME_PRIORITY_CLASS);
SetThreadPriority(GetCurrentThread, THREAD_PRIORITY_TIME_CRITICAL);

Sleep(10);
asm
dw 310Fh // rdtsc
mov TimerLo, eax
mov TimerHi, edx
end;
Sleep(DelayTime);
asm
dw 310Fh // rdtsc
sub eax, TimerLo
sbb edx, TimerHi
mov TimerLo, eax
mov TimerHi, edx
end;

SetThreadPriority(GetCurrentThread, Priority);
SetPriorityClass(GetCurrentProcess, PriorityClass);

Result := TimerLo / (1000.0 * DelayTime);
end;

procedure TFormCPUSpeed.BitBtnStartClick(Sender: TObject);
begin
BitBtnStart.Enabled := False;
BitBtnStop.Enabled := True;

Stop := False;
while not Stop do
begin
LabelCPUSpeed.Caption := Format('CPU speed: %f MHz', [GetCPUSpeed]);
Application.ProcessMessages;
end;

BitBtnStart.Enabled := True;
BitBtnStop.Enabled := False;
end;

procedure TFormCPUSpeed.BitBtnStopClick(Sender: TObject);
begin
Stop := True;
end;

end.

[naughtyboy]

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