Visual Basic WMI System Services
Obtaining Temperature Probe Information using WMI
Posted:   Monday March 05, 2002
Updated:   Monday November 28, 2011
Applies to:   VB5, VB6
Developed with:   VB6, Windows XP
OS restrictions:   Windows NT, 2000, XP. See Prerequisites below.
Author:   VBnet - Randy Birch


Win32_BaseBoard: WMI Baseboard (Motherboard) Info
Win32_BIOS: WMI System BIOS Information

Win32_Processor: WMI Processor Information
Win32_CacheMemory: WMI System Cache Memory Info
Win32_TemperatureProbe: WMI Temperature Probe Info
Windows Script Host is built into Microsoft Windows 98, 2000, ME and XP. If you are running Windows 95 or NT4, you can download Windows Script Host from the Microsoft Windows Script Technologies Web site at Some information is not returned on non-NT-based systems.

A reference set in Projects / References to the Microsoft WMI Scripting Library.

Please note: some systems may not report temperature information. Therefore, while informative I do not recommend using this code in a mission-critical application unless you are assured the target machines will return this information, and regardless of application appropriate error handling should be employed.

The Win32_TemperatureProbe WMI class represents the properties of a temperature sensor (electronic thermometer).  (Can't believe I missed the 'e' in 'probe' in the button caption.)

This demo and illustration only show some of the available information from the class. For a complete listing see the table in the Comments section below. Note that some systems may not return information in all class properties.

 BAS Module Code

 Form Code
To a form add a command button (Command1) and a listview (Listview1). Set a reference in Projects / References to the Microsoft WMI Scripting Library, and add the following to the form:

Option Explicit
' Copyright 1996-2011 VBnet/Randy Birch, All Rights Reserved.
' Some pages may also contain other copyrights by the author.
' Distribution: You can freely use this code in your own
'               applications, but you may not reproduce 
'               or publish this code on any web site,
'               online service, or distribute as source 
'               on any media without express permission.
'/* Below used for listview column auto-resizing
Private Const LVM_FIRST As Long = &H1000
Private Const LVM_SETCOLUMNWIDTH As Long = (LVM_FIRST + 30)
Private Const LVSCW_AUTOSIZE As Long = -1

Private Declare Function SendMessage Lib "user32" _
   Alias "SendMessageA" _
  (ByVal hwnd As Long, _
   ByVal wMsg As Long, _
   ByVal wParam As Long, _
   lParam As Any) As Long

Private Sub Form_Load()

   With ListView1
      .ColumnHeaders.Add , , "Desc"
      .ColumnHeaders.Add , , "Name"
      .ColumnHeaders.Add , , "Device ID"
      .ColumnHeaders.Add , , "Status"
      .ColumnHeaders.Add , , "Resolution"
      .ColumnHeaders.Add , , "Tolerance"
      .ColumnHeaders.Add , , "Accuracy"
      .View = lvwReport
      .Sorted = False
   End With
   Command1.Caption = "Temperature Probe Info"
End Sub

Private Sub Command1_Click()

   Call wmiProbeInfo
   Call lvAutosizeControl(ListView1)
End Sub

Private Sub lvAutosizeControl(lv As ListView)

   Dim col2adjust As Long

  '/* Size each column based on the maximum of
  '/* EITHER the columnheader text width, or,
  '/* if the items below it are wider, the
  '/* widest list item in the column
   For col2adjust = 0 To lv.ColumnHeaders.Count - 1
      Call SendMessage(lv.hwnd, _
                       LVM_SETCOLUMNWIDTH, _
                       col2adjust, _
                       ByVal LVSCW_AUTOSIZE_USEHEADER)

End Sub

Private Sub wmiProbeInfo()

   Dim wmiObjSet As SWbemObjectSet
   Dim obj As SWbemObject   'CurrentProbe
   Dim itmx As ListItem

   On Local Error Resume Next
   Set wmiObjSet = GetObject("winmgmts:{impersonationLevel=impersonate}"). _
   For Each obj In wmiObjSet
      Set itmx = ListView1.ListItems.Add(, , obj.Description)
      itmx.SubItems(1) = obj.Name
      itmx.SubItems(2) = obj.DeviceID
      itmx.SubItems(3) = obj.Status
      itmx.SubItems(4) = obj.Resolution
      itmx.SubItems(5) = obj.Tolerance
      itmx.SubItems(6) = obj.Accuracy / obj.Resolution / obj.Tolerance & " %"
End Sub
All information returned in the Win32_TemperatureProbe class (note that some systems may not return information in all class properties):
sint32 Accuracy
uint16 Availability
string Caption
uint32 ConfigManagerErrorCode
boolean ConfigManagerUserConfig
string CreationClassName
sint32 CurrentReading
string Description
string DeviceID
boolean ErrorCleared
string ErrorDescription
datetime InstallDate
boolean IsLinear
uint32 LastErrorCode
sint32 LowerThresholdCritical
sint32 LowerThresholdFatal
sint32 LowerThresholdNonCritical
sint32 MaxReadable
sint32 MinReadable
string Name
sint32 NominalReading
sint32 NormalMax
sint32 NormalMin
string PNPDeviceID
uint16 PowerManagementCapabilities[]
boolean PowerManagementSupported
uint32 Resolution
string Status
uint16 StatusInfo
string SystemCreationClassName
string SystemName
sint32 Tolerance
sint32 UpperThresholdCritical
sint32 UpperThresholdFatal
sint32 UpperThresholdNonCritical


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