Visual Basic WMI System Services
Win32_DesktopMonitor: WMI Desktop Monitor Info
Posted:   Monday March 25, 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_DesktopMonitor: WMI Desktop Monitor Info
Win32_DisplayConfiguration: WMI Display Configuration Info
Win32_VideoController: WMI Video Controller 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.

The Win32_DesktopMonitor WMI class represents the type of monitor or display device attached to the computer system.

This demo and illustration only shows 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.
'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 , , "Device ID"
      .ColumnHeaders.Add , , "Caption"
      .ColumnHeaders.Add , , "Manu"
      .ColumnHeaders.Add , , "Stat"
      .ColumnHeaders.Add , , "Availability"
      .View = lvwReport
      .Sorted = False
   End With
   Command1.Caption = "Desktop Monitor Info"
End Sub

Private Sub Command1_Click()

   Call wmiDesktopMonitorInfo
   Call lvAutosizeControl(ListView1)
End Sub

Private Sub lvAutosizeControl(lv As ListView)

   Dim col2adjust As Long

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

   lv.Visible = True
End Sub

Private Sub wmiDesktopMonitorInfo()

   Dim dtmSet As SWbemObjectSet
   Dim dtm As SWbemObject
   Dim itmx As ListItem
   Dim msg As String
   Set dtmSet = GetObject("winmgmts:{impersonationLevel=impersonate}"). _
   On Local Error Resume Next
   For Each dtm In dtmSet
      Set itmx = ListView1.ListItems.Add(, , dtm.DeviceID)
      itmx.SubItems(1) = dtm.Caption
      itmx.SubItems(2) = dtm.MonitorManufacturer
      itmx.SubItems(3) = dtm.Status
      Select Case dtm.Availability
         Case 1: msg = "other"
         Case 2: msg = "unknown "
         Case 3: msg = "running/full power"
         Case 4: msg = "warning "
         Case 5: msg = "in test "
         Case 6: msg = "not applicable "
         Case 7: msg = "power off "
         Case 8: msg = "off line "
         Case 9: msg = "off duty "
         Case 10: msg = "degraded "
         Case 11: msg = "not installed "
         Case 12: msg = "install error "
         Case 13: msg = "power save - unknown "
         Case 14: msg = "power save - low power mode "
         Case 15: msg = "power save - standby "
         Case 16: msg = "power cycle "
         Case 17: msg = "power save - warning "
         Case 18: msg = "paused "
         Case 19: msg = "not ready "
         Case 20: msg = "not configured "
         Case 21: msg = "quiesced"
      End Select
      itmx.SubItems(4) = msg
End Sub
All information returned in the Win32_DesktopMonitor class (note that some systems may not return information in all class properties):
uint16 Availability
uint32 Bandwidth
string Caption
uint32 ConfigManagerErrorCode
boolean ConfigManagerUserConfig
string CreationClassName
string Description
string DeviceID
uint16 DisplayType
boolean ErrorCleared
string ErrorDescription
datetime InstallDate
boolean IsLocked
uint32 LastErrorCode
string MonitorManufacturer
string MonitorType
string Name
uint32 PixelsPerXLogicalInch
uint32 PixelsPerYLogicalInch
string PNPDeviceID
uint16 PowerManagementCapabilities[]
boolean PowerManagementSupported
uint32 ScreenHeight
uint32 ScreenWidth
string Status
uint16 StatusInfo
string SystemCreationClassName
string SystemName


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