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function GetCPUUsage(var liOldIdleTime, liOldSystemTime: LARGE_INTEGER): string;
type
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;
TSystem_Performance_Information = packed record
liIdleTime: LARGE_INTEGER; {LARGE_INTEGER}
dwSpare: array[0..75] of DWORD;
end;
TSystem_Time_Information = packed record
liKeBootTime: LARGE_INTEGER;
liKeSystemTime: LARGE_INTEGER;
liExpTimeZoneBias: LARGE_INTEGER;
uCurrentTimeZoneId: ULONG;
dwReserved: DWORD;
end;
TNtQuerySystemInformation = function(infoClass: DWORD; buffer: Pointer; bufSize: DWORD; var returnSize: Dword): DWORD; stdcall;
var
NtQuerySystemInformation: TNtQuerySystemInformation;
SysBaseInfo: TSystem_Basic_Information;
SysPerfInfo: TSystem_Performance_Information;
SysTimeInfo: TSystem_Time_Information;
status: DWORD; {long}
dbSystemTime: Double;
dbIdleTime: Double;
begin
Result := '<N/A>';
NtQuerySystemInformation := GetProcAddress(GetModuleHandle('ntdll.dll'), 'NtQuerySystemInformation');
if @NtQuerySystemInformation = nil then Exit;
if (NtQuerySystemInformation(0, @SysBaseInfo, SizeOf(SysBaseInfo), status) <> 0)
or (NtQuerySystemInformation(3, @SysTimeInfo, SizeOf(SysTimeInfo), status) <> 0)
or (NtQuerySystemInformation(2, @SysPerfInfo, SizeOf(SysPerfInfo), status) <> 0) then Exit;
if liOldIdleTime.QuadPart <> 0 then
begin
// CurrentValue = NewValue - OldValue
dbIdleTime := Int64(SysPerfInfo.liIdleTime) - Int64(liOldIdleTime);
dbSystemTime := Int64(SysTimeInfo.liKeSystemTime) - Int64(liOldSystemTime);
// CurrentCpuIdle = IdleTime / SystemTime
dbIdleTime := dbIdleTime / dbSystemTime;
// CurrentCpuUsage% = 100 - (CurrentCpuIdle * 100) / NumberOfProcessors
dbIdleTime := 100.0 - dbIdleTime * 100.0 / SysBaseInfo.bKeNumberProcessors{ + 0.5};
// Show Percentage
Result := FormatFloat('0.00 %',dbIdleTime);
end;
liOldIdleTime := SysPerfInfo.liIdleTime;
liOldSystemTime := SysTimeInfo.liKeSystemTime;
end;
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