升级到 Windows 10 后 WMI 无法正常工作 [英] WMI not working after upgrading to Windows 10

问题描述

我一直在 Windows 8 上的 Visual Studio 中为控制台应用程序使用以下代码，以返回连接的串行设备的描述和设备 ID.我在我正在创建的应用程序中使用它的修改版本来自动检测 Arduino 的 COM 端口.自从我使用 Windows 10 进行全新安装后，它不再返回任何内容.我有一个 USB 转串行 AVR 编程器，但是仍然使用此代码显示.我检查了注册表，Arduino 列在 SERIALCOMM 中，Arduino 在设备管理器的端口(COM 和 LPT)"下显示为USB 串行端口(COM6)"，我可以使用 Arduino 软件对 Arduino 进行编程.我不知道为什么它不再工作了.

I had been using the code below for a console application in Visual Studio on Windows 8 to return the description and device ID of connected serial devices. I was using a modified version of this in an application I'm creating to automatically detect the COM port of an Arduino. It no longer returns anything since I've done a fresh install with Windows 10. I have a USB to serial AVR programmer that still shows up using this code however. I checked the registry and the Arduino is listed in SERIALCOMM, the Arduino is showing as 'USB Serial Port (COM6)' under 'Ports (COM & LPT)' in Device Manager and I can program the Arduino using the Arduino software. I have no idea why it isn't working any more.

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Management;
using System.IO.Ports;
using System.Diagnostics;

namespace ConsoleApplication1
{
    class Program
    {
        static void Main() 
        {


            ManagementScope connectionScope = new ManagementScope();
            SelectQuery serialQuery = new SelectQuery("SELECT * FROM Win32_SerialPort");
            ManagementObjectSearcher searcher = new ManagementObjectSearcher(connectionScope, serialQuery);

            try
            {
                foreach (ManagementObject item in searcher.Get())
                {
                    string desc = item["Description"].ToString();
                    string deviceId = item["DeviceID"].ToString();

                    Console.WriteLine(desc);
                    Console.WriteLine(deviceId);
                }
            }
            catch (ManagementException e)
            {
                Console.WriteLine(e.Message);
            }

            Console.ReadKey();
        }
    }
}

这也可能是相关的，在尝试寻找解决方案时，我发现了以下实现来使用 MSSerial_PortName 查找端口名称，但我收到了拒绝访问错误.

It might also be relevant that while trying to find a solution I found the following implementation to find port names using MSSerial_PortName and I got an Access Denied error.

using System;
using System.Management;

namespace ConsoleApplication1
{
    class Program
    {
        static void Main() 
        {
            try
            {
                ManagementObjectSearcher MOSearcher = new ManagementObjectSearcher("root\WMI", "SELECT * FROM MSSerial_PortName");

                foreach (ManagementObject MOject in MOSearcher.Get())
                {
                    Console.WriteLine(MOject["PortName"]); 
                }
            }
            catch (ManagementException me)
            {
                Console.WriteLine("An error occurred while querying for WMI data: " + me.Message);
            }
            Console.ReadKey();
        }
    }
}

推荐答案

好的，我想我现在看到了问题(我会添加一个新答案，但不会替换旧答案，以防有人发现信息有用).

Ok, I think I see the issue now (I will add a new answer, but won't replace the old in case someone finds the information useful).

Win32_SerialPort 仅检测硬件串行端口(例如 RS232).Win32_PnPEntity 识别即插即用设备，包括硬件和虚拟串行端口(例如由 FTDI 驱动程序创建的 COM 端口).

Win32_SerialPort only detects hardware serial ports (e.g. RS232). Win32_PnPEntity identifies plug-and-play devices including hardware and virtual serial ports (e.g. COM port created by the FTDI driver).

要使用 Win32_PnPEntity 来识别驱动程序需要一些额外的工作.以下代码识别系统上的所有 COM 端口并生成所述端口的列表.从这个列表中，您可以确定合适的 COM 端口号来创建您的 SerialPort 对象.

To use Win32_PnPEntity to identify a driver requires a little extra work. The following code identifies all COM ports on the system and produces a list of said ports. From this list, you may identify the appropriate COM port number to create your SerialPort object.

// Class to contain the port info.
public class PortInfo
{
  public string Name;
  public string Description;
}

// Method to prepare the WMI query connection options.
public static ConnectionOptions PrepareOptions ( )
{
  ConnectionOptions options = new ConnectionOptions ( );
  options . Impersonation = ImpersonationLevel . Impersonate;
  options . Authentication = AuthenticationLevel . Default;
  options . EnablePrivileges = true;
  return options;
}

// Method to prepare WMI query management scope.
public static ManagementScope PrepareScope ( string machineName , ConnectionOptions options , string path  )
{
  ManagementScope scope = new ManagementScope ( );
  scope . Path = new ManagementPath ( @"\" + machineName + path );
  scope . Options = options;
  scope . Connect ( );
  return scope;
}

// Method to retrieve the list of all COM ports.
public static List<PortInfo> FindComPorts ( )
{
  List<PortInfo> portList = new List<PortInfo> ( );
  ConnectionOptions options = PrepareOptions ( );
  ManagementScope scope = PrepareScope ( Environment . MachineName , options , @"
ootCIMV2" );

  // Prepare the query and searcher objects.
  ObjectQuery objectQuery = new ObjectQuery ( "SELECT * FROM Win32_PnPEntity WHERE ConfigManagerErrorCode = 0" );
  ManagementObjectSearcher portSearcher = new ManagementObjectSearcher ( scope , objectQuery );

  using ( portSearcher )
  {
    string caption = null;
    // Invoke the searcher and search through each management object for a COM port.
    foreach ( ManagementObject currentObject in portSearcher . Get ( ) )
    {
      if ( currentObject != null )
      {
        object currentObjectCaption = currentObject [ "Caption" ];
        if ( currentObjectCaption != null )
        {
          caption = currentObjectCaption . ToString ( );
          if ( caption . Contains ( "(COM" ) )
          {
            PortInfo portInfo = new PortInfo ( );
            portInfo . Name = caption . Substring ( caption . LastIndexOf ( "(COM" ) ) . Replace ( "(" , string . Empty ) . Replace ( ")" , string . Empty );
            portInfo . Description = caption;
            portList . Add ( portInfo );
          }
        }
      }
    }
  }
  return portList;
}

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