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Question

如何在delphi中编程得到cpu的占用比率！？

Answer 1

在C++Builder论坛里，有一个 Win 2000/XP 下的代码，你自己看一下：
http://expert.csdn.net/Expert/TopicView1.asp?id=1671459

Answer 2

http://www.swissdelphicenter.ch/torry/showcode.php?id=969
 How to get the CPU usage in percent
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;