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...die CPU Auslastung unter Windows NT/2000/XP ermitteln?
Autor: Thomas Stutz
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Tip Bewertung (35):  
     


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;


// for 95/98/NT/2000/XP: http://tinyurl.com/77j2

 

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