type
  TProcessCpuUsage = record
  private
    FLastUsed, FLastTime: Int64;
    FCpuCount:Integer;
  public
    class function Create: TProcessCpuUsage; static;
    function Current: Single;
  end;

 

class function TProcessCpuUsage.Create: TProcessCpuUsage;
begin
  Result.FLastTime := 0;
  Result.FLastUsed := 0;
  Result.FCpuCount := 0;
end;

 

function TProcessCpuUsage.Current: Single;
var
  Usage, ACurTime: UInt64;
  CreateTime, ExitTime, IdleTime, UserTime, KernelTime: TFileTime;
  function FileTimeToI64(const ATime: TFileTime): Int64;
  begin
    Result := (Int64(ATime.dwHighDateTime) shl 32) + ATime.dwLowDateTime;
  end;
  function GetCPUCount: Integer;
  var
    SysInfo: TSystemInfo;
  begin
    GetSystemInfo(SysInfo);
    Result := SysInfo.dwNumberOfProcessors;
  end;

 

begin
  Result := 0;
  if GetProcessTimes(GetCurrentProcess, CreateTime, ExitTime, KernelTime,
    UserTime) then
  begin
    ACurTime := GetTickCount;
    Usage := FileTimeToI64(UserTime) + FileTimeToI64(KernelTime);
    if FLastTime <> 0 then
      Result := (Usage - FLastUsed) / (ACurTime - FLastTime) /
        FCpuCount / 100
    else
      FCpuCount:=GetCpuCount;
    FLastUsed := Usage;
    FLastTime := ACurTime;
  end;
end;