Get CPU usage with Delphi [duplicate] - windows

Question

I am trying to get the % of total CPU usage to a label1.Caption
I've searched and found these:
didn't work - http://www.vbforums.com/showthread.php?345723-DELPHI-Get-CPU-Usage
not what I need - http://delphi.cjcsoft.net/viewthread.php?tid=42837
also found bunch of solutions regarding calculating the Usage per process but that is not what i am looking for , i just want the total CPU usage
like this widget :
this is what i am working on :
I believe there is a simple way like when we get RAM usage.
GlobalMemoryStatus(RamStats);
Label1.Caption := Format('RAM: %d %%', [RamStats.dwMemoryLoad]);

Answer 1

I have found an article, determine-cpu-usage-of-current-process-c-and-c, about how to get the CPU usage of the current process.
Now we need to do a bit more to compute the Total CPU usage percentage by adding up CPU usage percentage for each running processes:
function GetTotalCpuUsagePct(): Double;
var
ProcessID: TProcessID;
RunningProcessIDs : TArray<TProcessID>;
begin
Result := 0.0;
RunningProcessIDs := GetRunningProcessIDs;
DeleteNonExistingProcessIDsFromCache(RunningProcessIDs);
for ProcessID in RunningProcessIDs do
Result := Result + GetProcessCpuUsagePct( ProcessID );
end;
After getting running process id's, we start out calling
DeleteNonExistingProcessIDsFromCache to clean up the cache, that holds previous Cpu usage times needed in GetProcessCpuUsagePct: Every process that has been stopped since last query is removed from this cache.
The GetProcessCpuUsagePct is the core, which is a translation of determine-cpu-usage-of-current-process-c-and-c. This function needs to retrieve the previous reading from the Cpu Usage Cache LatestProcessCpuUsageCache (global in the unit) using the ProcessID.
Note, it is not recommended to call GetToalCpuUsageCpu less than every 200 ms, as it may give wrong results.
function GetProcessCpuUsagePct(ProcessID: TProcessID): Double;
function SubtractFileTime(FileTime1: TFileTIme; FileTime2: TFileTIme): TFileTIme;
begin
Result := TFileTIme(Int64(FileTime1) - Int64(FileTime2));
end;
var
ProcessCpuUsage: TProcessCpuUsage;
ProcessHandle: THandle;
SystemTimes: TSystemTimesRec;
SystemDiffTimes: TSystemTimesRec;
ProcessDiffTimes: TProcessTimesRec;
ProcessTimes: TProcessTimesRec;
SystemTimesIdleTime: TFileTime;
ProcessTimesCreationTime: TFileTime;
ProcessTimesExitTime: TFileTime;
begin
Result := 0.0;
LatestProcessCpuUsageCache.TryGetValue(ProcessID, ProcessCpuUsage);
if ProcessCpuUsage = nil then
begin
ProcessCpuUsage := TProcessCpuUsage.Create;
LatestProcessCpuUsageCache.Add(ProcessID, ProcessCpuUsage);
end;
// method from:
// http://www.philosophicalgeek.com/2009/01/03/determine-cpu-usage-of-current-process-c-and-c/
ProcessHandle := OpenProcess(PROCESS_QUERY_INFORMATION or PROCESS_VM_READ, False, ProcessID);
if ProcessHandle <> 0 then
begin
try
if GetSystemTimes(SystemTimesIdleTime, SystemTimes.KernelTime, SystemTimes.UserTime) then
begin
SystemDiffTimes.KernelTime := SubtractFileTime(SystemTimes.KernelTime, ProcessCpuUsage.LastSystemTimes.KernelTime);
SystemDiffTimes.UserTime := SubtractFileTime(SystemTimes.UserTime, ProcessCpuUsage.LastSystemTimes.UserTime);
ProcessCpuUsage.LastSystemTimes := SystemTimes;
if GetProcessTimes(ProcessHandle, ProcessTimesCreationTime, ProcessTimesExitTime, ProcessTimes.KernelTime, ProcessTimes.UserTime) then
begin
ProcessDiffTimes.KernelTime := SubtractFileTime(ProcessTimes.KernelTime, ProcessCpuUsage.LastProcessTimes.KernelTime);
ProcessDiffTimes.UserTime := SubtractFileTime(ProcessTimes.UserTime, ProcessCpuUsage.LastProcessTimes.UserTime);
ProcessCpuUsage.LastProcessTimes := ProcessTimes;
if (Int64(SystemDiffTimes.KernelTime) + Int64(SystemDiffTimes.UserTime)) > 0 then
Result := (Int64(ProcessDiffTimes.KernelTime) + Int64(ProcessDiffTimes.UserTime)) / (Int64(SystemDiffTimes.KernelTime) + Int64(SystemDiffTimes.UserTime)) * 100;
end;
end;
finally
CloseHandle(ProcessHandle);
end;
end;
end;
Here is a screen shot of the result on a Windows 7.
Full Listing of unit:
unit uTotalCpuUsagePct;
interface
function GetTotalCpuUsagePct : Double;
implementation
uses
SysUtils, DateUtils, Windows, PsAPI, TlHelp32, ShellAPI, Generics.Collections;
type
TProcessID = DWORD;
TSystemTimesRec = record
KernelTime: TFileTIme;
UserTime: TFileTIme;
end;
TProcessTimesRec = record
KernelTime: TFileTIme;
UserTime: TFileTIme;
end;
TProcessCpuUsage = class
LastSystemTimes: TSystemTimesRec;
LastProcessTimes: TProcessTimesRec;
ProcessCPUusagePercentage: Double;
end;
TProcessCpuUsageList = TObjectDictionary<TProcessID, TProcessCpuUsage>;
var
LatestProcessCpuUsageCache : TProcessCpuUsageList;
LastQueryTime : TDateTime;
(* -------------------------------------------------------------------------- *)
function GetRunningProcessIDs: TArray<TProcessID>;
var
SnapProcHandle: THandle;
ProcEntry: TProcessEntry32;
NextProc: Boolean;
begin
SnapProcHandle := CreateToolhelp32Snapshot(TH32CS_SNAPPROCESS, 0);
if SnapProcHandle <> INVALID_HANDLE_VALUE then
begin
try
ProcEntry.dwSize := SizeOf(ProcEntry);
NextProc := Process32First(SnapProcHandle, ProcEntry);
while NextProc do
begin
SetLength(Result, Length(Result) + 1);
Result[Length(Result) - 1] := ProcEntry.th32ProcessID;
NextProc := Process32Next(SnapProcHandle, ProcEntry);
end;
finally
CloseHandle(SnapProcHandle);
end;
TArray.Sort<TProcessID>(Result);
end;
end;
(* -------------------------------------------------------------------------- *)
function GetProcessCpuUsagePct(ProcessID: TProcessID): Double;
function SubtractFileTime(FileTime1: TFileTIme; FileTime2: TFileTIme): TFileTIme;
begin
Result := TFileTIme(Int64(FileTime1) - Int64(FileTime2));
end;
var
ProcessCpuUsage: TProcessCpuUsage;
ProcessHandle: THandle;
SystemTimes: TSystemTimesRec;
SystemDiffTimes: TSystemTimesRec;
ProcessDiffTimes: TProcessTimesRec;
ProcessTimes: TProcessTimesRec;
SystemTimesIdleTime: TFileTime;
ProcessTimesCreationTime: TFileTime;
ProcessTimesExitTime: TFileTime;
begin
Result := 0.0;
LatestProcessCpuUsageCache.TryGetValue(ProcessID, ProcessCpuUsage);
if ProcessCpuUsage = nil then
begin
ProcessCpuUsage := TProcessCpuUsage.Create;
LatestProcessCpuUsageCache.Add(ProcessID, ProcessCpuUsage);
end;
// method from:
// http://www.philosophicalgeek.com/2009/01/03/determine-cpu-usage-of-current-process-c-and-c/
ProcessHandle := OpenProcess(PROCESS_QUERY_INFORMATION or PROCESS_VM_READ, False, ProcessID);
if ProcessHandle <> 0 then
begin
try
if GetSystemTimes(SystemTimesIdleTime, SystemTimes.KernelTime, SystemTimes.UserTime) then
begin
SystemDiffTimes.KernelTime := SubtractFileTime(SystemTimes.KernelTime, ProcessCpuUsage.LastSystemTimes.KernelTime);
SystemDiffTimes.UserTime := SubtractFileTime(SystemTimes.UserTime, ProcessCpuUsage.LastSystemTimes.UserTime);
ProcessCpuUsage.LastSystemTimes := SystemTimes;
if GetProcessTimes(ProcessHandle, ProcessTimesCreationTime, ProcessTimesExitTime, ProcessTimes.KernelTime, ProcessTimes.UserTime) then
begin
ProcessDiffTimes.KernelTime := SubtractFileTime(ProcessTimes.KernelTime, ProcessCpuUsage.LastProcessTimes.KernelTime);
ProcessDiffTimes.UserTime := SubtractFileTime(ProcessTimes.UserTime, ProcessCpuUsage.LastProcessTimes.UserTime);
ProcessCpuUsage.LastProcessTimes := ProcessTimes;
if (Int64(SystemDiffTimes.KernelTime) + Int64(SystemDiffTimes.UserTime)) > 0 then
Result := (Int64(ProcessDiffTimes.KernelTime) + Int64(ProcessDiffTimes.UserTime)) / (Int64(SystemDiffTimes.KernelTime) + Int64(SystemDiffTimes.UserTime)) * 100;
end;
end;
finally
CloseHandle(ProcessHandle);
end;
end;
end;
(* -------------------------------------------------------------------------- *)
procedure DeleteNonExistingProcessIDsFromCache(const RunningProcessIDs : TArray<TProcessID>);
var
FoundKeyIdx: Integer;
Keys: TArray<TProcessID>;
n: Integer;
begin
Keys := LatestProcessCpuUsageCache.Keys.ToArray;
for n := Low(Keys) to High(Keys) do
begin
if not TArray.BinarySearch<TProcessID>(RunningProcessIDs, Keys[n], FoundKeyIdx) then
LatestProcessCpuUsageCache.Remove(Keys[n]);
end;
end;
(* -------------------------------------------------------------------------- *)
function GetTotalCpuUsagePct(): Double;
var
ProcessID: TProcessID;
RunningProcessIDs : TArray<TProcessID>;
begin
Result := 0.0;
RunningProcessIDs := GetRunningProcessIDs;
DeleteNonExistingProcessIDsFromCache(RunningProcessIDs);
for ProcessID in RunningProcessIDs do
Result := Result + GetProcessCpuUsagePct( ProcessID );
end;
(* -------------------------------------------------------------------------- *)
initialization
LatestProcessCpuUsageCache := TProcessCpuUsageList.Create( [ doOwnsValues ] );
// init:
GetTotalCpuUsagePct;
finalization
LatestProcessCpuUsageCache.Free;
end.
Test Code:
unit Unit1;
interface
uses
Vcl.Forms, System.SysUtils, Vcl.Controls, Vcl.StdCtrls, System.Classes,
Vcl.ExtCtrls,
uTotalCpuUsagePct;
type
TForm1 = class(TForm)
Timer1: TTimer;
Label1: TLabel;
procedure Timer1Timer(Sender: TObject);
procedure FormCreate(Sender: TObject);
private
{ Private declarations }
public
{ Public declarations }
end;
var
Form1: TForm1;
implementation
{$R *.dfm}
procedure TForm1.FormCreate(Sender: TObject);
begin
// start cpu load thread
TThread.CreateAnonymousThread(
procedure
begin
while True do
begin
end;
end).Start;
end;
procedure TForm1.Timer1Timer(Sender: TObject);
var
TotalCPUusagePercentage: Double;
begin
TotalCPUusagePercentage := GetTotalCpuUsagePct();
Label1.Caption := 'Total cpu: ' + IntToStr(Round(TotalCPUusagePercentage)) + '%';
end;
end.

Answer 2

You can achieve your goal using the Performance Counters Functions from Microsoft.
Limited User Access Support
Only the administrator of the computer or users in the Performance Logs User Group can log and view counter data. Users in the Administrator group can log and view counter data only if the tool they use to log and view counter data is started from a Command Prompt window that is opened with Run as administrator.... Users in the Performance Monitoring Users group can view counter data.
I have found this answer - see CPU currently used - from the Lanzelot user here on SO and I have done some porting to Delphi.
Raw porting:
program Project1;
{$APPTYPE CONSOLE}
uses
SysUtils,
pdh in 'pdh.pas';
var
cpuQuery: HQUERY;
cpuTotal: HCOUNTER;
i: Integer;
procedure init;
begin
PdhOpenQuery(nil, 0, cpuQuery);
PdhAddCounter(cpuQuery, '\Processor(_Total)\% Processor Time', 0, cpuTotal);
PdhCollectQueryData(cpuQuery);
end;
function getCurrentValue: Double;
var
counterVal: TPdhFmtCounterValue;
begin
PdhCollectQueryData(cpuQuery);
PdhGetFormattedCounterValue(cpuTotal, PDH_FMT_DOUBLE, nil, counterVal);
Result := counterVal.doubleValue;
end;
The example requires the pdh unit which I have grabbed from here.
The WinPerf unit is needed by the pdh and I have downloaded it from here.
Basic test in a console application:
begin
init;
for i := 1 to 60 do begin
//let's monitor the CPU usage for one minute
WriteLn(getCurrentValue);
Sleep(1000);
end;
PdhCloseQuery(cpuQuery);
end.
A more useful example based on the TThread class.
This allows to obtain different counters based on the parameter passed to the ACounterPath argument in the constructor.
counterThread.pas
unit counterThread;
interface
uses
Classes, Windows, SyncObjs, pdh;
type
TCounterNotifyEvent = procedure(AValue: Double) of object;
TCounterThread = class(TThread)
private
FInterval: Integer;
FWaitEvent: TEvent;
FHQuery: HQUERY;
FHCounter: HCOUNTER;
procedure checkSuccess(AResult: Integer);
protected
procedure Execute; override;
procedure TerminatedSet; override;
public
OnCounter: TCounterNotifyEvent;
constructor Create(const ACounterPath: PChar; AInterval: Cardinal; ACreateSuspended: Boolean);
destructor Destroy; override;
end;
implementation
uses
SysUtils;
procedure TCounterThread.checkSuccess(AResult: Integer);
begin
if ERROR_SUCCESS <> AResult then
RaiseLastOSError;
end;
constructor TCounterThread.Create(const ACounterPath: PChar; AInterval: Cardinal; ACreateSuspended: Boolean);
begin
inherited Create(ACreateSuspended);
FInterval := AInterval;
FWaitEvent := TEvent.Create(nil, False, False, '');
FHQuery := INVALID_HANDLE_VALUE;
checkSuccess(PdhOpenQuery(nil, 0, FHQuery));
checkSuccess(PdhAddCounter(FHQuery, ACounterPath, 0, FHCounter));
//checkSuccess(PdhAddEnglishCounter(FHQuery, ACounterPath, 0, FHCounter));
checkSuccess(PdhCollectQueryData(FHQuery));
end;
destructor TCounterThread.Destroy;
begin
FWaitEvent.Free;
if (FHQuery <> 0) and (FHQuery <> INVALID_HANDLE_VALUE) then
PdhCloseQuery(FHQuery);
inherited;
end;
procedure TCounterThread.TerminatedSet;
begin
inherited;
FWaitEvent.SetEvent;
end;
procedure TCounterThread.Execute;
var
counterVal: TPdhFmtCounterValue;
begin
inherited;
while not Terminated do begin
checkSuccess(PdhCollectQueryData(FHQuery));
FillChar(counterVal, SizeOf(TPdhFmtCounterValue), 0);
checkSuccess(PdhGetFormattedCounterValue(FHCounter, PDH_FMT_DOUBLE, nil, counterVal));
if Assigned(OnCounter) then
OnCounter(counterVal.doubleValue);
FWaitEvent.WaitFor(FInterval);
end;
end;
end.
Unit1.pas
unit Unit1;
interface
uses
Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
Dialogs, StdCtrls,
counterThread;
type
TForm1 = class(TForm)
Edit1: TEdit;
Button1: TButton;
Label1: TLabel;
procedure Button1Click(Sender: TObject);
procedure FormDestroy(Sender: TObject);
private
{ Private declarations }
FCpuCounter: TCounterThread;
procedure CpuCounterCounter(AValue: Double);
public
{ Public declarations }
end;
var
Form1: TForm1;
implementation
{$R *.dfm}
procedure TForm1.Button1Click(Sender: TObject);
begin
FCpuCounter := TCounterThread.Create('\Processor(_Total)\% Processor Time', 1000, False);
//'\Processore(_Total)\% Tempo Processore'
with FCpuCounter do begin
FreeOnTerminate := True;
OnCounter := CpuCounterCounter;
end;
Button1.Enabled := False;
end;
procedure TForm1.CpuCounterCounter(AValue: Double);
begin
Edit1.Text := FloatToStr(AValue);
end;
procedure TForm1.FormDestroy(Sender: TObject);
begin
if Assigned(FCpuCounter) then
FCpuCounter.Terminate;
end;
end.
Unit1.dfm
object Form1: TForm1
Left = 0
Top = 0
Caption = 'Form1'
ClientHeight = 123
ClientWidth = 239
Color = clBtnFace
Font.Charset = DEFAULT_CHARSET
Font.Color = clWindowText
Font.Height = -11
Font.Name = 'Tahoma'
Font.Style = []
OldCreateOrder = False
OnDestroy = FormDestroy
PixelsPerInch = 96
TextHeight = 13
object Label1: TLabel
Left = 8
Top = 24
Width = 97
Height = 13
Caption = 'Total CPU usage %:'
end
object Edit1: TEdit
Left = 111
Top = 21
Width = 99
Height = 21
TabOrder = 0
end
object Button1: TButton
Left = 111
Top = 80
Width = 99
Height = 25
Caption = 'Start monitoring'
TabOrder = 1
OnClick = Button1Click
end
end
OFF TOPIC
I'm currently at home and I've not a Delphi XE here so I coded it with Turbo Delphi, I have no pdh unit installed on my machine and I can't know at the moment if Delphi XE has the units.
NOTICE
I have used the PdhAddCounter function instead of the PdhAddEnglishCounter because the function reference is missing in the unit. Unfortunately, after I added the reference, the function was still missing in the Pdh.dll on my old Windows XP.
The szFullCounterPath of the PdhAddCounter is localized so I have to use the italian localized path on my Windows \Processore(_Total)\% Tempo Processore.
If you use the PdhAddEnglishCounter function or your locale is english, you have to use the path \Processor(_Total)\% Processor Time.
If your system locale is other than english or italian, you have to find the path by yourself using the PdhBrowseCounters function.
The very basic function usage which follows needs the PdhMsg unit.
See also MSDN Browsing Performance Counters for further reference.
function CounterPathCallBack(dwArg: DWORD_PTR): Longint; stdcall;
begin
Form1.Memo1.Lines.Add(PChar(dwArg));
Result := ERROR_SUCCESS;
end;
procedure TForm1.Button2Click(Sender: TObject);
const
PDH_MAX_COUNTER_PATH = 255;//maybe ?
BROWSE_DIALOG_CAPTION: PChar = 'Select a counter to monitor.';
var
browseDlgData: TPdhBrowseDlgConfig;
counterPathBuffer: array [0..PDH_MAX_COUNTER_PATH-1] of Char;
status: LongInt;
begin
FillChar(browseDlgData, SizeOf(TPdhBrowseDlgConfig), 0);
with browseDlgData do begin
{bIncludeInstanceIndex = FALSE;
bSingleCounterPerAdd = TRUE;
bSingleCounterPerDialog = TRUE;
bLocalCountersOnly = FALSE;
bWildCardInstances = TRUE;
bHideDetailBox = TRUE;
bInitializePath = FALSE;
bDisableMachineSelection = FALSE;
bIncludeCostlyObjects = FALSE;
bShowObjectBrowser = FALSE;}
hWndOwner := Self.Handle;
szReturnPathBuffer := #counterPathBuffer[0];
cchReturnPathLength := PDH_MAX_COUNTER_PATH;
pCallBack := CounterPathCallBack;
dwCallBackArg := DWORD_PTR(#counterPathBuffer[0]);
CallBackStatus := ERROR_SUCCESS;
dwDefaultDetailLevel := PERF_DETAIL_WIZARD;
szDialogBoxCaption := BROWSE_DIALOG_CAPTION;
end;
status := PdhBrowseCounters(browseDlgData);
case status of
PDH_DIALOG_CANCELLED, ERROR_SUCCESS:
;
else
RaiseLastOSError;
end;
end;

Answer 3

http://www.magsys.co.uk/delphi/
Get the MagWMI component. It's free.
This component will allow you to access the WMI pretty easily which already has the info you want. I just tested an old program I had using this on Win 10 and it correctly found all 8 of my cores and the processor usage.
And then do something like this:
var
compname:string;
WmiResults: T2DimStrArray ;
instances, i : Integer
Begin
compname:=getcompname; // a function in the MagWMI to get the computer name.
MagWmiGetInfoEx (compname, '', '',
'', 'SELECT percentidletime FROM Win32_PerfFormattedData_PerfOS_Processor', WmiResults, instances, errstr) ;
for i := 1 to instances do
begin
// wmiresults[i,2] will hold the percentage for each processor found.
end;

Answer 4

I solve this way:
function TCPU.get_param_value(param_name: String): String;
var
command,
file_out: String;
data_file: TStringList;
begin
data_file := TStringList.Create;
try
try
file_out := TPath.GetTempPath + FormatDateTime('yyyymmddhhnnss', Now) + '_CPUInfo.txt';
comando := '"wmic cpu get '+param_name+' /value | find "'+param_name+'" > ' +
file_out + '&&exit"';
// "runas" for admin privileges, or "open" to any user
ShellExecute(0, 'open', 'cmd.exe', PChar('/k ' + command), nil, SW_HIDE);
// Wait 4 sec to cmd release the process...
Sleep(4000);
data_file.LoadFromFile(file_out);
Result := data_file.Values[param_name];
except
Result := '';
end;
finally
TFile.Delete(file_out);
data_file.Free;
end;
In this way, you can get any param values from wmic

Answer 5

I found t h i s
does the job
uses adCpuUsage;
procedure TForm1.Button1Click(Sender: TObject);
var
i:integer;
u:string;
begin
collectcpudata;
for i:=0 to GetCPUCount-1 do
u:=FloatToStr(Round(getcpuusage(i)*100)); //Round to approximate 1.0003 to 1
label1.Caption:=u
end;
end.
worked for me