[0nni]

От себя отрываю =)

Код:

unit qraTaskCpu;

interface

uses windows;

function GetCPUUsage : byte;

implementation

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;

function GetCPUUsage : byte;
var
  SysBaseInfo: TSystem_Basic_Information;
  SysPerfInfo: TSystem_Performance_Information;
  SysTimeInfo: TSystem_Time_Information;
  status: Longint; {long}
  dbSystemTime: Double;
  dbIdleTime: Double;
begin
  {todo : в модуле отсутствовала проверка даления на "0",
    для вещественных чисел это оборочивальсь простым выходом из процедр
    без каких либо ошибок}
  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;
  }


    // 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
      if dbSystemTime <> 0 then
      dbIdleTime := dbIdleTime / dbSystemTime else dbIdleTime := 0; 


      // CurrentCpuUsage% = 100 - (CurrentCpuIdle * 100) / NumberOfProcessors
      if SysBaseInfo.bKeNumberProcessors <> 0 then
      dbIdleTime := 100.0 - dbIdleTime * 100.0 / SysBaseInfo.bKeNumberProcessors
        + 0.5
        else
         dbIdleTime := 0;
      if dbIdleTime > 100 then dbIdleTime := 0;
      // Show Percentage
      result := Trunc(dbIdleTime);


      // Abort if user pressed ESC or Application is terminated

    end;

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

    // wait one second
end;

end.