WMI查询不返回任何值 [英] WMI query not returning any values

问题描述

您好，



我正在尝试查询WMI以获取串行端口连接（COM端口）。我可以看到设备管理器上的端口，但在尝试通过WMI（Win32_SerialPort）查询它们时，没有任何显示。我可以通过HyperTerminal连接到其中一个端口（COM7）。它是我尝试使用C＃连接的GSM / GPRS调制解调器。



调制解调器的设备管理器中的描述是HSPADatacard NMEA设备（COM7）。 br />


尝试在Win10机器上执行此操作。



非常感谢任何帮助。



我尝试过：



使用管理员权限运行cmd，'模式'当插入调制解调器时，命令确实反映了额外的COM端口。



使用WMICodeCreator生成VBscript来报告端口也没有产生任何结果。< br $>


脚本生成：

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:

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

推荐答案

Win32 \_SerialPort类| Microsoft Docs [ ^ ]仅列出物理串行端口，而不是设备驱动程序提供的虚拟串行端口。



一种解决方案是使用 MSSerial_PortName \root \ WMI 命名空间中的c $ c>类。另请参阅使用WMI查询的SerialPorts列表与devicemanager不同？ - 堆栈溢出 [ ^ ]。

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[^].

@Jochen Arndt，尝试更改查询以使用MSSerial_PortName，我得到的只是查询中的错误，没有返回任何结果。



经过一番阅读后，以下查询确实有效：

@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:

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

生成输出：

That generated the output of :

引用：

----------------------------- ------

Win32_PnPEntity实例

-------------------------- ---------

说明：HSPADataCard NMEA设备（COM7）

描述：HSPADataCard NMEA设备

DeviceID：USB \\ \\ _VID_19D2& PID_0082& MI_01 \6& 1C9A94D5& 0& 0001

硬件ID：USB \VID_19D2& PID_0082& REV_0000& MI_01，USB \VID_19D2& PID_0082& MI_01

制造商：HSPADataCard

名称：HSPADataCard NMEA设备（COM7）

PNPClass：端口

PNPDeviceID：USB \VID_19D2& PID_0082& MI_01 \ 6& 1C9A94D5& 0& 0001

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

下一步将是查询和/或设置相关端口的参数（如波特率，奇偶校验等）

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

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