Как узнать загрузку процессора (NT – 2000 - XP)

const

  SystemBasicInformation = 0;
  SystemPerformanceInformation = 2;
  SystemTimeInformation = 3;

type

  TPDWord = ^DWORD;

  TSystem_Basic_Information = packed
 record

    dwUnknown1: DWORD;
    uKeMaximumIncrement: ULONG;
    uPageSize: ULONG;
    uMmNumberOfPhysicalPages: ULONG;
    uMmLowestPhysicalPage: ULONG;
    uMmHighestPhysicalPage: ULONG;
    uAllocationGranularity: ULONG;
    pLowestUserAddress: Pointer;
    pMmHighestUserAddress: Pointer;
    uKeActiveProcessors: ULONG;
    bKeNumberProcessors: byte;
    bUnknown2: byte;
    wUnknown3: word;
  end
;

type

  TSystem_Performance_Information = packed
 record

    liIdleTime: LARGE_INTEGER; {LARGE_INTEGER}
    dwSpare: array
[0..75] of
 DWORD;
  end
;

type

  TSystem_Time_Information = packed
 record

    liKeBootTime: LARGE_INTEGER;
    liKeSystemTime: LARGE_INTEGER;
    liExpTimeZoneBias: LARGE_INTEGER;
    uCurrentTimeZoneId: ULONG;
    dwReserved: DWORD;
  end
;

var

  NtQuerySystemInformation: function
(infoClass: DWORD;
    buffer: Pointer;
    bufSize: DWORD;
    returnSize: TPDword): DWORD; stdcall
 = nil
;

  liOldIdleTime: LARGE_INTEGER = ();
  liOldSystemTime: LARGE_INTEGER = ();

function
 Li2Double(x: LARGE_INTEGER): Double;
begin

  Result := x.HighPart * 4.294967296E9 + x.LowPart
end
;

procedure
 GetCPUUsage;
var

  SysBaseInfo: TSystem_Basic_Information;
  SysPerfInfo: TSystem_Performance_Information;
  SysTimeInfo: TSystem_Time_Information;
  status: Longint; {long}
  dbSystemTime: Double;
  dbIdleTime: Double;

  bLoopAborted: boolean;

begin

  if
 @NtQuerySystemInformation = nil
 then

    NtQuerySystemInformation := GetProcAddress(GetModuleHandle('ntdll.dll'),
      'NtQuerySystemInformation');

  // get number of processors in the system

  status := NtQuerySystemInformation(SystemBasicInformation, @SysBaseInfo,
    SizeOf(SysBaseInfo), nil
);
  if
 status <> 0 then

    Exit;

  // Show some information
  with
 SysBaseInfo do

  begin

    ShowMessage(
      Format('uKeMaximumIncrement: %d'#13'uPageSize: %d'#13   +
      'uMmNumberOfPhysicalPages: %d' + #13 + 'uMmLowestPhysicalPage: %d' + #13 +
      'uMmHighestPhysicalPage: %d' + #13 + 'uAllocationGranularity: %d'#13 +
      'uKeActiveProcessors: %d'#13'bKeNumberProcessors: %d'  ,
      [uKeMaximumIncrement, uPageSize, uMmNumberOfPhysicalPages,
      uMmLowestPhysicalPage, uMmHighestPhysicalPage, uAllocationGranularity,
        uKeActiveProcessors, bKeNumberProcessors]));
  end
;

  bLoopAborted := False;

  while
 not
 bLoopAborted do

  begin


    // get new system time
    status := NtQuerySystemInformation(SystemTimeInformation, @SysTimeInfo,
      SizeOf(SysTimeInfo), 0);
    if
 status <> 0 then

      Exit;

    // get new CPU's idle time
    status := NtQuerySystemInformation(SystemPerformanceInformation,
      @SysPerfInfo, SizeOf(SysPerfInfo), nil
);
    if
 status <> 0 then

      Exit;

    // if it's a first call - skip it
    if
 (liOldIdleTime.QuadPart <> 0) then

    begin


      // CurrentValue = NewValue - OldValue
      dbIdleTime := Li2Double(SysPerfInfo.liIdleTime) -
        Li2Double(liOldIdleTime);
      dbSystemTime := Li2Double(SysTimeInfo.liKeSystemTime) -
        Li2Double(liOldSystemTime);

      // CurrentCpuIdle = IdleTime / SystemTime
      dbIdleTime := dbIdleTime / dbSystemTime;

      // CurrentCpuUsage% = 100 - (CurrentCpuIdle * 100) / NumberOfProcessors
      dbIdleTime := 100.0 - dbIdleTime * 100.0 / SysBaseInfo.bKeNumberProcessors
        + 0.5;

      // Show Percentage
      Form1.Label1.Caption := FormatFloat('CPU Usage: 0.0 %', dbIdleTime);

      Application.ProcessMessages;

      // Abort if user pressed ESC or Application is terminated
      bLoopAborted := (GetKeyState(VK_ESCAPE) and
 128 = 128) or

        Application.Terminated;

    end
;

    // store new CPU's idle and system time
    liOldIdleTime := SysPerfInfo.liIdleTime;
    liOldSystemTime := SysTimeInfo.liKeSystemTime;

    // wait one second
    Sleep(1000);
  end
;
end
;

procedure
 TForm1.Button1Click(Sender: TObject);
begin

  GetCPUUsage
end
;

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