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WMI Tasks using Delphi – Computer Hardware

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Determine how much free memory a computer has

Use the class Win32_OperatingSystem and the FreePhysicalMemory property.

const
  wbemFlagForwardOnly = $00000020;
var
  FSWbemLocator : OLEVariant;
  FWMIService   : OLEVariant;
  FWbemObjectSet: OLEVariant;
  FWbemObject   : OLEVariant;
  oEnum         : IEnumvariant;
  iValue        : LongWord;
begin;
  FSWbemLocator := CreateOleObject('WbemScripting.SWbemLocator');
  FWMIService   := FSWbemLocator.ConnectServer('localhost', 'root\cimv2', '', '');
  FWbemObjectSet:= FWMIService.ExecQuery('SELECT FreePhysicalMemory FROM Win32_OperatingSystem','WQL',wbemFlagForwardOnly);
  oEnum         := IUnknown(FWbemObjectSet._NewEnum) as IEnumVariant;
  if oEnum.Next(1, FWbemObject, iValue) = 0 then
  begin
    Writeln(Format('Available Physical Memory %d',[Integer(FWbemObject.FreePhysicalMemory)]));
    FWbemObject:=Unassigned;
  end;
end;

Determine whether a computer has a DVD drive

Use the Win32_CDROMDrive class and check for the acronym DVD in the Name or DeviceID property.

const
  wbemFlagForwardOnly = $00000020;
var
  FSWbemLocator : OLEVariant;
  FWMIService   : OLEVariant;
  FWbemObjectSet: OLEVariant;
  FWbemObject   : OLEVariant;
  oEnum         : IEnumvariant;
  iValue        : LongWord;
begin;
  FSWbemLocator := CreateOleObject('WbemScripting.SWbemLocator');
  FWMIService   := FSWbemLocator.ConnectServer('localhost', 'root\cimv2', '', '');
  FWbemObjectSet:= FWMIService.ExecQuery('SELECT * FROM Win32_CDROMDrive','WQL',wbemFlagForwardOnly);
  oEnum         := IUnknown(FWbemObjectSet._NewEnum) as IEnumVariant;
  while oEnum.Next(1, FWbemObject, iValue) = 0 do
  begin
    Writeln(Format('DeviceID    %s',[FWbemObject.DeviceID]));
    Writeln(Format('Description %s',[FWbemObject.Description]));
    Writeln(Format('Name        %s',[FWbemObject.Name]));
    Writeln('');
    FWbemObject:=Unassigned;
  end;
end;

Determine how much RAM is installed in a computer

Use the Win32_ComputerSystem class and check the value of the TotalPhysicalMemory property.

const
  wbemFlagForwardOnly = $00000020;
var
  FSWbemLocator : OLEVariant;
  FWMIService   : OLEVariant;
  FWbemObjectSet: OLEVariant;
  FWbemObject   : OLEVariant;
  oEnum         : IEnumvariant;
  iValue        : LongWord;
begin;
  FSWbemLocator := CreateOleObject('WbemScripting.SWbemLocator');
  FWMIService   := FSWbemLocator.ConnectServer('localhost', 'root\cimv2', '', '');
  FWbemObjectSet:= FWMIService.ExecQuery('SELECT TotalPhysicalMemory FROM Win32_ComputerSystem','WQL',wbemFlagForwardOnly);
  oEnum         := IUnknown(FWbemObjectSet._NewEnum) as IEnumVariant;
  if oEnum.Next(1, FWbemObject, iValue) = 0 then
  begin
    Writeln(Format('Total Physical Memory %d',[Integer(FWbemObject.TotalPhysicalMemory)]));
    FWbemObject:=Unassigned;
  end;
end;

Determine if a computer has more than one processor

Use the Win32_ComputerSystem class and the property NumberOfProcessors.

const
  wbemFlagForwardOnly = $00000020;
var
  FSWbemLocator : OLEVariant;
  FWMIService   : OLEVariant;
  FWbemObjectSet: OLEVariant;
  FWbemObject   : OLEVariant;
  oEnum         : IEnumvariant;
  iValue        : LongWord;
begin;
  FSWbemLocator := CreateOleObject('WbemScripting.SWbemLocator');
  FWMIService   := FSWbemLocator.ConnectServer('localhost', 'root\cimv2', '', '');
  FWbemObjectSet:= FWMIService.ExecQuery('SELECT NumberOfProcessors FROM Win32_ComputerSystem ','WQL',wbemFlagForwardOnly);
  oEnum         := IUnknown(FWbemObjectSet._NewEnum) as IEnumVariant;
  if oEnum.Next(1, FWbemObject, iValue) = 0 then
  begin
    Writeln(Format('Number Of Processors %d',[Integer(FWbemObject.NumberOfProcessors)]));
    FWbemObject:=Unassigned;
  end;
end;

Determine whether a computer has a PCMCIA slot

Use the Win32_PCMCIAController class.

const
  wbemFlagForwardOnly = $00000020;
var
  FSWbemLocator : OLEVariant;
  FWMIService   : OLEVariant;
  FWbemObjectSet: OLEVariant;
  FWbemObject   : OLEVariant;
  oEnum         : IEnumvariant;
  iValue        : LongWord;
  c             : Integer;
begin;
  FSWbemLocator := CreateOleObject('WbemScripting.SWbemLocator');
  FWMIService   := FSWbemLocator.ConnectServer('localhost', 'root\cimv2', '', '');
  FWbemObjectSet:= FWMIService.ExecQuery('SELECT DeviceID FROM Win32_PCMCIAController','WQL',wbemFlagForwardOnly);
  oEnum         := IUnknown(FWbemObjectSet._NewEnum) as IEnumVariant;
  c:=0;
  while oEnum.Next(1, FWbemObject, iValue) = 0 do
  begin
    inc(c);
    FWbemObject:=Unassigned;
  end;
  Writeln(Format('Number of PCMCIA slots %d',[c]));
end;

Identify devices that are not working (those marked with an exclamation point icon in Device Manager)

Use the Win32_PnPEntity class and use the following clause in your WQL query. WHERE ConfigManagerErrorCode <> 0.

const
  wbemFlagForwardOnly = $00000020;
var
  FSWbemLocator : OLEVariant;
  FWMIService   : OLEVariant;
  FWbemObjectSet: OLEVariant;
  FWbemObject   : OLEVariant;
  oEnum         : IEnumvariant;
  iValue        : LongWord;
begin;
  FSWbemLocator := CreateOleObject('WbemScripting.SWbemLocator');
  FWMIService   := FSWbemLocator.ConnectServer('localhost', 'root\cimv2', '', '');
  FWbemObjectSet:= FWMIService.ExecQuery('SELECT * FROM  Win32_PnPEntity WHERE ConfigManagerErrorCode <> 0','WQL',wbemFlagForwardOnly);
  oEnum         := IUnknown(FWbemObjectSet._NewEnum) as IEnumVariant;
  while oEnum.Next(1, FWbemObject, iValue) = 0 do
  begin
    Writeln(Format('Class GUID %s',[String(FWbemObject.ClassGUID)]));
    Writeln(Format('Description %s',[String(FWbemObject.Description)]));
    Writeln(Format('Device ID %s',[String(FWbemObject.DeviceID)]));
    Writeln(Format('Manufacturer %s',[String(FWbemObject.Manufacturer)]));
    Writeln(Format('Name %s',[String(FWbemObject.Name)]));
    Writeln(Format('PNP Device ID %s',[String(FWbemObject.PNPDeviceID)]));
    Writeln('');
    FWbemObject:=Unassigned;
  end;
end;

Determine the properties of the mouse used on computer

Use the Win32_PointingDevice class. This returns the properties of all pointing devices, not just mouse devices.

const
  wbemFlagForwardOnly = $00000020;
var
  FSWbemLocator : OLEVariant;
  FWMIService   : OLEVariant;
  FWbemObjectSet: OLEVariant;
  FWbemObject   : OLEVariant;
  oEnum         : IEnumvariant;
  iValue        : LongWord;
begin;
  FSWbemLocator := CreateOleObject('WbemScripting.SWbemLocator');
  FWMIService   := FSWbemLocator.ConnectServer('localhost', 'root\cimv2', '', '');
  FWbemObjectSet:= FWMIService.ExecQuery('SELECT * FROM  Win32_PointingDevice','WQL',wbemFlagForwardOnly);
  oEnum         := IUnknown(FWbemObjectSet._NewEnum) as IEnumVariant;
  while oEnum.Next(1, FWbemObject, iValue) = 0 do
  begin
    Writeln(Format('Device ID               %s',[String(FWbemObject.DeviceID)]));
    Writeln(Format('Description             %s',[String(FWbemObject.Description)]));
    Writeln(Format('Manufacturer            %s',[String(FWbemObject.Manufacturer)]));
    Writeln(Format('Device Interface        %s',[String(FWbemObject.DeviceInterface)]));
    Writeln(Format('PNP Device ID           %s',[String(FWbemObject.PNPDeviceID)]));

    if not VarIsNull(FWbemObject.DoubleSpeedThreshold) then
      Writeln(Format('Double Speed Threshold  %d',[Integer(FWbemObject.DoubleSpeedThreshold)]));

    if not VarIsNull(FWbemObject.Resolution) then
      Writeln(Format('Resolution %d',[Integer(FWbemObject.Resolution)]));

    if not VarIsNull(FWbemObject.SampleRate) then
      Writeln(Format('Sample Rate  %d',[Integer(FWbemObject.SampleRate)]));

    if not VarIsNull(FWbemObject.Synch) then
      Writeln(Format('Synch  %d',[Integer(FWbemObject.Synch)]));

    Writeln('');
    FWbemObject:=Unassigned;
  end;
end;

Determine the speed of a processor installed in a computer

Use the Win32_Processor class and check the value of the MaxClockSpeed property.

const
  wbemFlagForwardOnly = $00000020;
var
  FSWbemLocator : OLEVariant;
  FWMIService   : OLEVariant;
  FWbemObjectSet: OLEVariant;
  FWbemObject   : OLEVariant;
  oEnum         : IEnumvariant;
  iValue        : LongWord;
begin;
  FSWbemLocator := CreateOleObject('WbemScripting.SWbemLocator');
  FWMIService   := FSWbemLocator.ConnectServer('localhost', 'root\cimv2', '', '');
  FWbemObjectSet:= FWMIService.ExecQuery('SELECT * FROM  Win32_Processor','WQL',wbemFlagForwardOnly);
  oEnum         := IUnknown(FWbemObjectSet._NewEnum) as IEnumVariant;
  while oEnum.Next(1, FWbemObject, iValue) = 0 do
  begin
    Writeln(Format('Processor Id     %s',[String(FWbemObject.ProcessorId)]));
    Writeln(Format('Max Clock Speed  %d',[Integer(FWbemObject.MaxClockSpeed)]));

    Writeln('');
    FWbemObject:=Unassigned;
  end;
end;

Determine whether a computer is a tower, a mini-tower, a laptop, and so on

Use the Win32_SystemEnclosure class and check the value of the ChassisType property.

Value Meaning
1
 Other
2
 Unknown
3
 Desktop
4
 Low Profile Desktop
5
 Pizza Box
6
 Mini Tower
7
 Tower
8
 Portable
9
 Laptop
10
 Notebook
11
 Hand Held
12
 Docking Station
13
 All in One
14
 Sub Notebook
15
 Space-Saving
16
 Lunch Box
17
 Main System Chassis
18
 Expansion Chassis
19
 SubChassis
20
 Bus Expansion Chassis
21
 Peripheral Chassis
22
 Storage Chassis
23
 Rack Mount Chassis
24
 Sealed-Case PC 
const
  wbemFlagForwardOnly = $00000020;
var
  FSWbemLocator : OLEVariant;
  FWMIService   : OLEVariant;
  FWbemObjectSet: OLEVariant;
  FWbemObject   : OLEVariant;
  oEnum         : IEnumvariant;
  iValue        : LongWord;
  i             : integer;
begin;
  FSWbemLocator := CreateOleObject('WbemScripting.SWbemLocator');
  FWMIService   := FSWbemLocator.ConnectServer('localhost', 'root\cimv2', '', '');
  FWbemObjectSet:= FWMIService.ExecQuery('SELECT * FROM  Win32_SystemEnclosure','WQL',wbemFlagForwardOnly);
  oEnum         := IUnknown(FWbemObjectSet._NewEnum) as IEnumVariant;
  if oEnum.Next(1, FWbemObject, iValue) = 0 then
  begin
    for i := VarArrayLowBound(FWbemObject.ChassisTypes, 1) to VarArrayHighBound(FWbemObject.ChassisTypes, 1) do
     Writeln(Format('Chassis Types %d',[Integer(FWbemObject.ChassisTypes[i])]));
    FWbemObject:=Unassigned;
  end;
end;

Get the serial number and asset tag of a computer

Use the Win32_SystemEnclosure class, and the properties SerialNumber and SMBIOSAssetTag.

const
  wbemFlagForwardOnly = $00000020;
var
  FSWbemLocator : OLEVariant;
  FWMIService   : OLEVariant;
  FWbemObjectSet: OLEVariant;
  FWbemObject   : OLEVariant;
  oEnum         : IEnumvariant;
  iValue        : LongWord;
begin;
  FSWbemLocator := CreateOleObject('WbemScripting.SWbemLocator');
  FWMIService   := FSWbemLocator.ConnectServer('localhost', 'root\cimv2', '', '');
  FWbemObjectSet:= FWMIService.ExecQuery('SELECT * FROM  Win32_SystemEnclosure','WQL',wbemFlagForwardOnly);
  oEnum         := IUnknown(FWbemObjectSet._NewEnum) as IEnumVariant;
  if oEnum.Next(1, FWbemObject, iValue) = 0 then
  begin
    if not VarIsNull(FWbemObject.PartNumber) then
      Writeln(Format('Part Number      %s',[String(FWbemObject.PartNumber)]));
    if not VarIsNull(FWbemObject.SerialNumber) then
      Writeln(Format('Serial Number    %s',[String(FWbemObject.SerialNumber)]));
    if not VarIsNull(FWbemObject.SMBIOSAssetTag) then
      Writeln(Format('SMBIOS Asset Tag %s',[String(FWbemObject.SMBIOSAssetTag)]));
    FWbemObject:=Unassigned;
  end;
end;

Determine what kind of device is plugged into a USB port

Use the Win32_USBHub class and check the Description property. This property may have a value such as “Mass Storage Device” or “Printing Support”.

const
  wbemFlagForwardOnly = $00000020;
var
  FSWbemLocator : OLEVariant;
  FWMIService   : OLEVariant;
  FWbemObjectSet: OLEVariant;
  FWbemObject   : OLEVariant;
  oEnum         : IEnumvariant;
  iValue        : LongWord;
begin;
  FSWbemLocator := CreateOleObject('WbemScripting.SWbemLocator');
  FWMIService   := FSWbemLocator.ConnectServer('localhost', 'root\cimv2', '', '');
  FWbemObjectSet:= FWMIService.ExecQuery('SELECT * FROM  Win32_USBHub','WQL',wbemFlagForwardOnly);
  oEnum         := IUnknown(FWbemObjectSet._NewEnum) as IEnumVariant;
  while oEnum.Next(1, FWbemObject, iValue) = 0 do
  begin
    if not VarIsNull(FWbemObject.DeviceID) then
      Writeln(Format('Device ID        %s',[String(FWbemObject.DeviceID)]));
    if not VarIsNull(FWbemObject.PNPDeviceID) then
      Writeln(Format('PNP Device ID    %s',[String(FWbemObject.PNPDeviceID)]));
    if not VarIsNull(FWbemObject.Description) then
      Writeln(Format('Description      %s',[String(FWbemObject.Description)]));

    Writeln;
    FWbemObject:=Unassigned;
  end;
end;

This post is based in the MSDN entry WMI Tasks: Computer Hardware

Author: Rodrigo

Just another Delphi guy.

14 thoughts on “WMI Tasks using Delphi – Computer Hardware”

Leave a comment

  1. williamwmiller
    October 22, 2011 at 10:30 am

    It appears that FWbemObject.FreePhysicalMemory is not returning the correct result.

    Format( ‘%s’, [ string( FWbemObject.FreePhysicalMemory ) ] ) returns 5,808,468 bytes.

    GlobalMemoryStatusEx( Memory );
    Format( ‘%s’, [IntToStr( Memory.ullAvailPhys ) ) ] returns 6,011,977,728 bytes which is correct.

    Can you confirm this?

    Reply
  2. williamwmiller
    October 22, 2011 at 10:38 am

    this was tested on two different pc’s on Windows 7. FreePhysicalMemory was incorrect on both pc’s.

    Reply
    • Rodrigo
      October 22, 2011 at 3:35 pm

      The FreePhysicalMemory property returns the Number, in kilobytes, of physical memory currently unused and available.
      so you must multiply the value returned for this property.

      Check this sample

      const
  wbemFlagForwardOnly = $00000020;
var
  FSWbemLocator : OLEVariant;
  FWMIService   : OLEVariant;
  FWbemObjectSet: OLEVariant;
  FWbemObject   : OLEVariant;
  oEnum         : IEnumvariant;
  iValue        : LongWord;
  lpBuffer      : TMEMORYSTATUSEX;
  ullAvailPhys  : DWORDLONG;
begin;
  ZeroMemory(@lpBuffer,SizeOf(lpBuffer));
  lpBuffer.dwLength:=SizeOf(lpBuffer);
  FSWbemLocator := CreateOleObject('WbemScripting.SWbemLocator');
  FWMIService   := FSWbemLocator.ConnectServer('localhost', 'root\cimv2', '', '');
  FWbemObjectSet:= FWMIService.ExecQuery('SELECT FreePhysicalMemory FROM Win32_OperatingSystem','WQL',wbemFlagForwardOnly);
  GlobalMemoryStatusEx(lpBuffer);
  oEnum         := IUnknown(FWbemObjectSet._NewEnum) as IEnumVariant;
  if oEnum.Next(1, FWbemObject, iValue) = 0 then
  begin
    ullAvailPhys:=Integer(FWbemObject.FreePhysicalMemory)*UInt64(1024);
    Writeln(Format('WMI Available Physical Memory    %d',[ullAvailPhys]));
    Writeln(Format('WinApi Available Physical Memory %d',[lpBuffer.ullAvailPhys]));
    FWbemObject:=Unassigned;
  end;
end;

      Remember which can exist small differences because the physical memory can be released or reserved betwen the functions calls.

      Reply
  3. williamwmiller
    October 22, 2011 at 5:56 pm

    I get the correct results now…. This is a great blog…
    Thank-you.

    Reply
  4. williamwmiller
    October 23, 2011 at 12:55 pm

    Running Windows 7 on a Dell Studio XPS 9100 box. This function returns “Unknown”. System Information Shows:

    Intel(R) ICH10 Family USB Enhanced Host Controller – 3A3A PCI\VEN_8086&DEV_3A3A&SUBSYS_04821028&REV_00\3&11583659&0&EF
    Intel(R) ICH10 Family USB Enhanced Host Controller – 3A3C PCI\VEN_8086&DEV_3A3C&SUBSYS_04821028&REV_00\3&11583659&0&D7
    Intel(R) ICH10 Family USB Universal Host Controller – 3A34 PCI\VEN_8086&DEV_3A34&SUBSYS_04821028&REV_00\3&11583659&0&E8
    Intel(R) ICH10 Family USB Universal Host Controller – 3A35 PCI\VEN_8086&DEV_3A35&SUBSYS_04821028&REV_00\3&11583659&0&E9
    Intel(R) ICH10 Family USB Universal Host Controller – 3A36 PCI\VEN_8086&DEV_3A36&SUBSYS_04821028&REV_00\3&11583659&0&EA
    Intel(R) ICH10 Family USB Universal Host Controller – 3A37 PCI\VEN_8086&DEV_3A37&SUBSYS_04821028&REV_00\3&11583659&0&D0
    Intel(R) ICH10 Family USB Universal Host Controller – 3A38 PCI\VEN_8086&DEV_3A38&SUBSYS_04821028&REV_00\3&11583659&0&D1
    Intel(R) ICH10 Family USB Universal Host Controller – 3A39 PCI\VEN_8086&DEV_3A39&SUBSYS_04821028&REV_00\3&11583659&0&D2

    Did I make a mistake?

    function WMIGetNumberOfPCMCIASlots: string;
    // Get Number Of PCMCIA Slots
    const
    wbemFlagForwardOnly = $00000020;
    var
    FSWbemLocator: OleVariant;
    FWMIService: OleVariant;
    FWbemObjectSet: OleVariant;
    FWbemObject: OleVariant;
    oEnum: IEnumvariant;
    iValue: LongWord;
    begin
    FSWbemLocator := CreateOleObject( ‘WbemScripting.SWbemLocator’ );
    FWMIService := FSWbemLocator.ConnectServer( ‘localhost’, ‘root\cimv2’, ”, ” );
    FWbemObjectSet := FWMIService.ExecQuery( ‘SELECT * FROM Win32_PCMCIAController’, ‘WQL’, wbemFlagForwardOnly );
    oEnum := IUnknown( FWbemObjectSet._NewEnum ) as IEnumvariant;
    if oEnum.Next( 1, FWbemObject, iValue ) = 0 then
    begin
    if not VarIsNull( FWbemObject.Count ) then
    Result := Format( ‘%d’, [ Integer( FWbemObject.Count ) ] )
    else
    Result := ‘Unknown’;
    FWbemObject := Unassigned;
    end
    else
    Result := ‘Unknown’;
    end;

    Reply
  5. williamwmiller
    October 24, 2011 at 8:49 am

    The updated snippet reports: 0… but I have a lot of slots…4-5 on the Dell Box as well as 4 on the monitor. Does this snippet work on your Dell?

    Reply
  6. williamwmiller
    October 24, 2011 at 9:20 am

    Yes I think you are right. The slots are not the card slots on the motherboard but on the front of the Dell Box which typically load camera cards.

    Reply
  7. williamwmiller
    October 24, 2011 at 9:42 am

    I wrote a new function to return the number of processor cores:

    function WMIGetNumberOfCores: string;
// Get Number Of Processor Cores
const
  wbemFlagForwardOnly = $00000020;
var
  FSWbemLocator: OleVariant;
  FWMIService: OleVariant;
  FWbemObjectSet: OleVariant;
  FWbemObject: OleVariant;
  oEnum: IEnumvariant;
  iValue: LongWord;
begin ;
  FSWbemLocator := CreateOleObject( 'WbemScripting.SWbemLocator' );
  FWMIService := FSWbemLocator.ConnectServer( 'localhost', 'root\cimv2', '', '' );
  FWbemObjectSet := FWMIService.ExecQuery( 'SELECT * FROM  Win32_Processor', 'WQL', wbemFlagForwardOnly );
  oEnum := IUnknown( FWbemObjectSet._NewEnum ) as IEnumvariant;
  if oEnum.Next( 1, FWbemObject, iValue ) = 0 then
  begin
    Result := Format( '%d', [ Integer( FWbemObject.NumberOfCores ) ] );
    FWbemObject := Unassigned;
  end;
end;

//This returns 4.

    //This returns 8:
function GetNumberOfProcessorCores: string;
// return the number of Processor Cores from System_Info
var
  vSystemInfo: Windows._SYSTEM_INFO;
begin
  GetSystemInfo( vSystemInfo );
  Result := IntToStr( vSystemInfo.dwNumberOfProcessors );
end;

    is WMIGetNumberOfCores correct?

    Reply
  8. williamwmiller
    October 24, 2011 at 9:54 am

    Here are 2 more Win32_Processor functions:

    WMIGetNumberOfCores returns 4 here.
    WMIGetNumberOfLogicalProcessors returns 8 here.

    Feel free to add to your snippets if you like.

    function WMIGetNumberOfCores: string;
// Get Number Of Processor Cores
const
  wbemFlagForwardOnly = $00000020;
var
  FSWbemLocator: OleVariant;
  FWMIService: OleVariant;
  FWbemObjectSet: OleVariant;
  FWbemObject: OleVariant;
  oEnum: IEnumvariant;
  iValue: LongWord;
begin
  FSWbemLocator := CreateOleObject( 'WbemScripting.SWbemLocator' );
  FWMIService := FSWbemLocator.ConnectServer( 'localhost', 'root\cimv2', '', '' );
  FWbemObjectSet := FWMIService.ExecQuery( 'SELECT * FROM  Win32_Processor', 'WQL', wbemFlagForwardOnly );
  oEnum := IUnknown( FWbemObjectSet._NewEnum ) as IEnumvariant;
  if oEnum.Next( 1, FWbemObject, iValue ) = 0 then
  begin
    Result := Format( '%d', [ Integer( FWbemObject.NumberOfCores ) ] );
    FWbemObject := Unassigned;
  end;
end;

function WMIGetNumberOfLogicalProcessors: string;
// Get Number Of NumberOfLogicalProcessors
const
  wbemFlagForwardOnly = $00000020;
var
  FSWbemLocator: OleVariant;
  FWMIService: OleVariant;
  FWbemObjectSet: OleVariant;
  FWbemObject: OleVariant;
  oEnum: IEnumvariant;
  iValue: LongWord;
begin
  FSWbemLocator := CreateOleObject( 'WbemScripting.SWbemLocator' );
  FWMIService := FSWbemLocator.ConnectServer( 'localhost', 'root\cimv2', '', '' );
  FWbemObjectSet := FWMIService.ExecQuery( 'SELECT * FROM  Win32_Processor', 'WQL', wbemFlagForwardOnly );
  oEnum := IUnknown( FWbemObjectSet._NewEnum ) as IEnumvariant;
  if oEnum.Next( 1, FWbemObject, iValue ) = 0 then
  begin
    Result := Format( '%d', [ Integer( FWbemObject.NumberOfLogicalProcessors ) ] );
    FWbemObject := Unassigned;
  end;
end;
    Reply

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