Question

我正在尝试访问有关蓝牙串行端口的特定信息。我可以在蓝牙设置中找到此窗口，该窗口向我显示了与COM端口相关的蓝牙设备的端口，方向和名称。

当前，为了获取此信息，我一直在使用WQL查询某些Windows管理类。

# I don't really mind if it is run in a Powershell environment
gwmi -query "SELECT * FROM Win32_PnPEntity WHERE Name LIKE '%COM%' AND PNPDeviceID LIKE '%BTHENUM%' AND PNPClass = 'Ports'"

//or a C# environment
ManagementObjectCollection results = new ManagementObjectSearcher("SELECT * FROM Win32_PnPEntity WHERE Name LIKE '%COM%' AND PNPDeviceID LIKE 'USB%' AND PNPClass = 'Ports'").Get();

#This is a lot slower but it gets a bit more information about the serial ports
gwmi -query "SELECT * FROM Win32_SerialPort WHERE Name LIKE '%COM%' AND PNPDeviceID LIKE '%BTHENUM%'"

但是，下面的查询不包括名称（如屏幕快照中所示）和COM端口的方向。是否可以使用WQL获得此信息？

Answer 1

虽然我不确定是否可以使用WQL做到100％，但我能够用C＃编写一个处理该问题的小程序。

通过在某些Win32_PnPEntity属性中查找模式来工作。

它从所有存储的蓝牙设备中提取一个标识符，并将该标识符与COM端口上的相同标识符进行比较。如果找到它，则找到传出的COM端口。

传出端口和传入端口都具有相似的硬件ID，其中第一部分相同。然后，程序将使用此信息来识别传入的COM端口（如果存在）。

要以问题图像中所示的格式获取它，可以运行一个powershell命令来查询传出端口的DEVPKEY_Device_BusReportedDeviceDesc。这是传出端口上名称的'Dev B'部分。

所有这些操作都是异步完成的，因此在找到结果时会填充列表。

XAML

<Window x:Class="BluetoothInformation.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        xmlns:local="clr-namespace:BluetoothInformation"
        mc:Ignorable="d"
        Title="MainWindow" Height="450" Width="800">
    <Window.Resources>
        <local:DirectionConverter x:Key="directionConverter"/>
    </Window.Resources>
    <Grid>
        <Grid.RowDefinitions>
            <RowDefinition Height="*"/>
            <RowDefinition Height="auto"/>
        </Grid.RowDefinitions>
        <DataGrid ItemsSource="{Binding COMPorts}"
                  CanUserAddRows="False"
                  ColumnWidth="*"
                  AutoGenerateColumns="False"
                  VerticalScrollBarVisibility="Visible"
                  Background="Transparent"
                  RowBackground="Transparent"
                  IsReadOnly="True">
            <DataGrid.CellStyle>
                <Style TargetType="{x:Type DataGridCell}">
                    <Setter Property="Focusable"
                            Value="False"/>
                    <Style.Triggers>
                        <Trigger Property="IsSelected"
                                 Value="True">
                            <Setter Property="Background"
                                    Value="Transparent" />
                        </Trigger>
                    </Style.Triggers>
                </Style>
            </DataGrid.CellStyle>
            <DataGrid.Columns>
                <DataGridTextColumn Header="COM Port"
                                    Binding="{Binding COMPortPort}"/>
                <DataGridTextColumn Header="Direction"
                                    Binding="{Binding COMPortDirection, Converter={StaticResource directionConverter}}"/>
                <DataGridTextColumn Header="Name"
                                    Binding="{Binding COMPortName}"/>
            </DataGrid.Columns>
        </DataGrid>
        <Button Grid.Row="1"
                Content="Refresh"
                IsEnabled="{Binding CanRefresh}"
                Click="Button_Click"/>
    </Grid>
</Window>

C＃

using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.ComponentModel;
using System.Globalization;
using System.Management;
using System.Management.Automation;
using System.Runtime.CompilerServices;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Data;

namespace BluetoothInformation
{
    public partial class MainWindow : Window, INotifyPropertyChanged
    {
        public event PropertyChangedEventHandler PropertyChanged;

        private void RaisePropertyChanged([CallerMemberName] string propertyName = null)
        {
            PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
        }

        private ObservableCollection<COMPort> comPorts = new ObservableCollection<COMPort>();
        public ObservableCollection<COMPort> COMPorts {
            get => comPorts;
            set {
                comPorts = value;
                RaisePropertyChanged();
            }
        }

        private bool canRefresh = false;
        public bool CanRefresh {
            get => canRefresh;
            set {
                canRefresh = value;
                RaisePropertyChanged();
            }
        }

        public MainWindow()
        {
            InitializeComponent();
            DataContext = this;

            GetBluetoothCOMPort();
        }

        private string ExtractBluetoothDevice(string pnpDeviceID)
        {
            int startPos = pnpDeviceID.LastIndexOf('_') + 1;
            return pnpDeviceID.Substring(startPos);
        }

        private string ExtractDevice(string pnpDeviceID)
        {
            int startPos = pnpDeviceID.LastIndexOf('&') + 1;
            int length = pnpDeviceID.LastIndexOf('_') - startPos;
            return pnpDeviceID.Substring(startPos, length);
        }

        private string ExtractCOMPortFromName(string name)
        {
            int openBracket = name.IndexOf('(');
            int closeBracket = name.IndexOf(')');
            return name.Substring(openBracket + 1, closeBracket - openBracket - 1);
        }

        private string ExtractHardwareID(string fullHardwareID)
        {
            int length = fullHardwareID.LastIndexOf('_');
            return fullHardwareID.Substring(0, length);
        }

        private bool TryFindPair(string pairsName, string hardwareID, List<ManagementObject> bluetoothCOMPorts, out COMPort comPort)
        {
            foreach (ManagementObject bluetoothCOMPort in bluetoothCOMPorts)
            {
                string itemHardwareID = ((string[])bluetoothCOMPort["HardwareID"])[0];
                if (hardwareID != itemHardwareID && ExtractHardwareID(hardwareID) == ExtractHardwareID(itemHardwareID))
                {
                    comPort = new COMPort(ExtractCOMPortFromName(bluetoothCOMPort["Name"].ToString()), Direction.INCOMING, pairsName);
                    return true;
                }
            }
            comPort = null;
            return false;
        }

        private string GetDataBusName(string pnpDeviceID)
        {
            using (PowerShell PowerShellInstance = PowerShell.Create())
            {
                PowerShellInstance.AddScript($@"Get-PnpDeviceProperty -InstanceId '{pnpDeviceID}' -KeyName 'DEVPKEY_Device_BusReportedDeviceDesc' | select-object Data");

                Collection<PSObject> PSOutput = PowerShellInstance.Invoke();

                foreach (PSObject outputItem in PSOutput)
                {
                    if (outputItem != null)
                    {
                        Console.WriteLine(outputItem.BaseObject.GetType().FullName);
                        foreach (var p in outputItem.Properties)
                        {
                            if (p.Name == "Data")
                            {
                                return p.Value?.ToString();
                            }
                        }
                    }
                }
            }
            return string.Empty;
        }

        private void Button_Click(object sender, RoutedEventArgs e)
        {
            GetBluetoothCOMPort();
        }

        private async void GetBluetoothCOMPort()
        {
            CanRefresh = false;
            COMPorts.Clear();

            await Task.Run(() => {
                ManagementObjectCollection results = new ManagementObjectSearcher(@"SELECT PNPClass, PNPDeviceID, Name, HardwareID FROM Win32_PnPEntity WHERE (Name LIKE '%COM%' AND PNPDeviceID LIKE '%BTHENUM%' AND PNPClass = 'Ports') OR (PNPClass = 'Bluetooth' AND PNPDeviceID LIKE '%BTHENUM\\DEV%')").Get();

                List<ManagementObject> bluetoothCOMPorts = new List<ManagementObject>();
                List<ManagementObject> bluetoothDevices = new List<ManagementObject>();

                foreach (ManagementObject queryObj in results)
                {
                    if (queryObj["PNPClass"].ToString() == "Bluetooth")
                    {
                        bluetoothDevices.Add(queryObj);
                    }
                    else if (queryObj["PNPClass"].ToString() == "Ports")
                    {
                        bluetoothCOMPorts.Add(queryObj);
                    }
                }

                foreach (ManagementObject bluetoothDevice in bluetoothDevices)
                {
                    foreach (ManagementObject bluetoothCOMPort in bluetoothCOMPorts)
                    {
                        string comPortPNPDeviceID = bluetoothCOMPort["PNPDeviceID"].ToString();
                        if (ExtractBluetoothDevice(bluetoothDevice["PNPDeviceID"].ToString()) == ExtractDevice(comPortPNPDeviceID))
                        {
                            COMPort outgoingPort = new COMPort(ExtractCOMPortFromName(bluetoothCOMPort["Name"].ToString()), Direction.OUTGOING, $"{bluetoothDevice["Name"].ToString()} \'{GetDataBusName(comPortPNPDeviceID)}\'");

                            Dispatcher.Invoke(() => {
                                COMPorts.Add(outgoingPort);
                            });

                            if (TryFindPair(bluetoothDevice["Name"].ToString(), ((string[])bluetoothCOMPort["HardwareID"])[0], bluetoothCOMPorts, out COMPort incomingPort))
                            {
                                Dispatcher.Invoke(() => {
                                    COMPorts.Add(incomingPort);
                                });
                            }
                        }
                    }
                }
            });

            CanRefresh = true;
        }
    }

    public class COMPort : INotifyPropertyChanged
    {
        public event PropertyChangedEventHandler PropertyChanged;

        private void RaisePropertyChanged([CallerMemberName] string propertyName = null)
        {
            PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
        }

        private string comPortPort;
        public string COMPortPort {
            get => comPortPort;
            set {
                comPortPort = value;
                RaisePropertyChanged();
            }
        }

        private Direction comPortDirection;
        public Direction COMPortDirection {
            get => comPortDirection;
            set {
                comPortDirection = value;
                RaisePropertyChanged();
            }
        }

        private string comPortName;
        public string COMPortName {
            get => comPortName;
            set {
                comPortName = value;
                RaisePropertyChanged();
            }
        }

        public COMPort(string comPortPort, Direction comPortDirection, string comPortName)
        {
            COMPortPort = comPortPort;
            COMPortDirection = comPortDirection;
            COMPortName = comPortName;
        }
    }

    [ValueConversion(typeof(Direction), typeof(string))]
    public class DirectionConverter : IValueConverter
    {
        private const string UNDEFINED_DIRECTION = "UNDEFINED";
        private const string INCOMING_DIRECTION = "Incoming";
        private const string OUTGOING_DIRECTION = "Outgoing";

        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
        {
            switch ((Direction)value)
            {
                case Direction.UNDEFINED:
                    return UNDEFINED_DIRECTION;
                case Direction.INCOMING:
                    return INCOMING_DIRECTION;
                case Direction.OUTGOING:
                    return OUTGOING_DIRECTION;
            }

            return string.Empty;
        }

        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
        {
            throw new NotImplementedException();
        }
    }

    public enum Direction
    {
        UNDEFINED,
        INCOMING,
        OUTGOING
    }
}

获取蓝牙COM端口

1 个答案: