WMI query not returning any values

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Hi there,

I'm trying to query the WMI for serial port connections (COM ports). I can see the ports on the Device Manager but when trying to query them through WMI (Win32_SerialPort), nothing shows up. I am able to connect to one of the ports (COM7) via the HyperTerminal. It is a GSM/GPRS modem that I am attempting to connect to using C#.

The description in Device Manager for the modem is HSPADatacard NMEA Device (COM7).

Attempting to do this on a Win10 machine.

Any help is much appreciated.

What I have tried:

Running cmd with admin rights, the 'mode' command does reflect the additional COM ports when the modem is plugged in.

Using a WMICodeCreator to generate a VBscript to report on the ports did not yield any results either.

Script generated:

JavaScript

strComputer = "." 
<pre>Set objWMIService = GetObject("winmgmts:\\" & strComputer & "\root\CIMV2") 
Set colItems = objWMIService.ExecQuery( _
    "SELECT * FROM Win32_SerialPort",,48) 
For Each objItem in colItems 
    Wscript.Echo "-----------------------------------"
    Wscript.Echo "Win32_SerialPort instance"
    Wscript.Echo "-----------------------------------"
    Wscript.Echo "Caption: " & objItem.Caption
    Wscript.Echo "Description: " & objItem.Description
    Wscript.Echo "DeviceID: " & objItem.DeviceID
    Wscript.Echo "Name: " & objItem.Name
Next

Posted 21-Aug-18 18:44pm

Hazel J Chua

Updated 22-Aug-18 15:37pm

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2 solutions

Solution 1

The Win32\_SerialPort class | Microsoft Docs[^] lists only physical serial ports and not virtual ones provided by device drivers.

One solution is to use the MSSerial_PortName class in the \root\WMI namespace. See also List of SerialPorts queried using WMI differs from devicemanager? - Stack Overflow[^].

Posted 22-Aug-18 3:16am

Jochen Arndt

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Hazel J Chua · Accepted Answer · 2018-08-22T15:38:00

@Jochen Arndt, Tried changing the query to use MSSerial_PortName and all I got was an error in the query with no results returned.

After some reading the following query did work:

JavaScript

strComputer = "." 
Set objWMIService = GetObject("winmgmts:\\" & strComputer & "\root\CIMV2") 
Set colItems = objWMIService.ExecQuery( _
    "SELECT * FROM Win32_PnPEntity WHERE Name LIKE '%COM%' AND PNPClass = 'Ports'",,48) 
For Each objItem in colItems 
    Wscript.Echo "-----------------------------------"
    Wscript.Echo "Win32_PnPEntity instance"
    Wscript.Echo "-----------------------------------"
    Wscript.Echo "Caption: " & objItem.Caption
    Wscript.Echo "Description: " & objItem.Description
    Wscript.Echo "DeviceID: " & objItem.DeviceID
    If isNull(objItem.HardwareID) Then
        Wscript.Echo "HardwareID: "
    Else
        Wscript.Echo "HardwareID: " & Join(objItem.HardwareID, ",")
    End If
    Wscript.Echo "Manufacturer: " & objItem.Manufacturer
    Wscript.Echo "Name: " & objItem.Name
    Wscript.Echo "PNPClass: " & objItem.PNPClass
    Wscript.Echo "PNPDeviceID: " & objItem.PNPDeviceID
Next

That generated the output of :

Quote:
-----------------------------------
Win32_PnPEntity instance
-----------------------------------
Caption: HSPADataCard NMEA Device (COM7)
Description: HSPADataCard NMEA Device
DeviceID: USB\VID_19D2&PID_0082&MI_01\6&1C9A94D5&0&0001
HardwareID: USB\VID_19D2&PID_0082&REV_0000&MI_01,USB\VID_19D2&PID_0082&MI_01
Manufacturer: HSPADataCard
Name: HSPADataCard NMEA Device (COM7)
PNPClass: Ports
PNPDeviceID: USB\VID_19D2&PID_0082&MI_01\6&1C9A94D5&0&0001

The next step will be to query and/or set the relevant port's parameters (like Baud rate, parity etc)