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Reading CPU and memory usage

Use the function GetCPUUsage() from below

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 = ();
Usage: Double;

procedure GetCPUUsage;
var
SysBaseInfo: TSystem_Basic_Information;
SysPerfInfo: TSystem_Performance_Information;
SysTimeInfo: TSystem_Time_Information;
status: Longint; {long}
dbSystemTime: Double;
dbIdleTime: Double;
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;
// get new system time
status := NtQuerySystemInformation(SystemTimeInformation, @SysTimeInfo, SizeOf
                                     (SysTimeInfo), nil);
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
    Usage := dbIdleTime;
    if Usage>100 then
      Usage := 100
end;
// store new CPU's idle and system time
liOldIdleTime := SysPerfInfo.liIdleTime;
liOldSystemTime := SysTimeInfo.liKeSystemTime
end;

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