用C#扫描人机界面设备(HID)

Question

我正在开发一个C# .NET 2.0应用程序，其中我需要扫描附加的HID。这是如何做到的呢？因为它是HID，所以Windows不给它分配COM端口。我只需要以编程方式确定设备是否已附加。谢谢。

附加信息

当我将USB设备连接到我的计算机时，设备管理器中的人机界面设备下会出现两个条目。单击它们的属性将在各自的详细信息选项卡中生成这些信息：

符合HID的设备设备实例Id: HID\VID_1795&PID_6004\7&2694D932&0&0000

USB人机界面设备设备实例Id: USB\VID_1795&PID_6004\B973000000EB0D00

Answer 1

在WMI代码创建器中，选择以下选项：

命名空间: root\WMI

班级: MSWmi_PnPInstanceNames

从结果框中为下列代码选择InstanceNames：

using System;
using System.Management;
using System.Windows.Forms;

namespace WMISample
{
    public class MyWMIQuery
    {
        public static void Main()
        {
            try
            {
                ManagementObjectSearcher searcher = 
                    new ManagementObjectSearcher("root\\WMI", 
                    "SELECT * FROM MSWmi_PnPInstanceNames"); 

                foreach (ManagementObject queryObj in searcher.Get())
                {
                    Console.WriteLine("-----------------------------------");
                    Console.WriteLine("MSWmi_PnPInstanceNames instance");
                    Console.WriteLine("-----------------------------------");
                    Console.WriteLine("InstanceName: {0}", queryObj["InstanceName"]);
                }
            }
            catch (ManagementException e)
            {
                MessageBox.Show("An error occurred while querying for WMI data: " + e.Message);
            }
        }
    }
}

Answer 2

下面是在Windows上枚举Hid设备的示例：

    public static ConnectedDeviceDefinition GetDeviceDefinition(string deviceId, SafeFileHandle safeFileHandle)
    {
        try
        {
            var hidAttributes = GetHidAttributes(safeFileHandle);
            var hidCollectionCapabilities = GetHidCapabilities(safeFileHandle);
            var manufacturer = GetManufacturer(safeFileHandle);
            var serialNumber = GetSerialNumber(safeFileHandle);
            var product = GetProduct(safeFileHandle);

            return new ConnectedDeviceDefinition(deviceId)
            {
                WriteBufferSize = hidCollectionCapabilities.OutputReportByteLength,
                ReadBufferSize = hidCollectionCapabilities.InputReportByteLength,
                Manufacturer = manufacturer,
                ProductName = product,
                ProductId = (ushort)hidAttributes.ProductId,
                SerialNumber = serialNumber,
                Usage = hidCollectionCapabilities.Usage,
                UsagePage = hidCollectionCapabilities.UsagePage,
                VendorId = (ushort)hidAttributes.VendorId,
                VersionNumber = (ushort)hidAttributes.VersionNumber,
                DeviceType = DeviceType.Hid
            };
        }
        catch (Exception)
        {
            return null;
        }
    }

全班：https://github.com/MelbourneDeveloper/Device.Net/blob/master/src/Hid.Net/Windows/WindowsHidDeviceFactory.cs

这里的API调用：https://github.com/MelbourneDeveloper/Device.Net/blob/master/src/Hid.Net/Windows/HidAPICalls.cs

Windows 10 (UWP)也有类似的情况：

    public async Task<IEnumerable<ConnectedDeviceDefinition>> GetConnectedDeviceDefinitions(FilterDeviceDefinition deviceDefinition)
    {
        var aqsFilter = GetAqsFilter(deviceDefinition.VendorId, deviceDefinition.ProductId);

        var deviceInformationCollection = await wde.DeviceInformation.FindAllAsync(aqsFilter).AsTask();

        var deviceDefinitions = deviceInformationCollection.Select(d => GetDeviceInformation(d, DeviceType));

        var deviceDefinitionList = new List<ConnectedDeviceDefinition>();

        foreach (var deviceDef in deviceDefinitions)
        {
            var connectionInformation = await TestConnection(deviceDef.DeviceId);
            if (connectionInformation.CanConnect)
            {
                await Task.Delay(1000);

                deviceDef.UsagePage = connectionInformation.UsagePage;

                deviceDefinitionList.Add(deviceDef);
            }
        }

        return deviceDefinitionList;
    }

代码：https://github.com/MelbourneDeveloper/Device.Net/blob/77439b1ab0f4b3ad97376e4e62c7efac0a749783/src/Device.Net.UWP/UWPDeviceFactoryBase.cs#L47

安卓(https://github.com/MelbourneDeveloper/Device.Net/blob/77439b1ab0f4b3ad97376e4e62c7efac0a749783/src/Usb.Net.Android/AndroidUsbDeviceFactory.cs#L31)：

    public Task<IEnumerable<ConnectedDeviceDefinition>> GetConnectedDeviceDefinitions(FilterDeviceDefinition deviceDefinition)
    {
        return Task.Run<IEnumerable<ConnectedDeviceDefinition>>(() =>
        {
            //TODO: Get more details about the device.
            return UsbManager.DeviceList.Select(kvp => kvp.Value).Where(d => deviceDefinition.VendorId == d.VendorId && deviceDefinition.ProductId == d.ProductId).Select(GetAndroidDeviceDefinition).ToList();
        });
    }

使用Hid.Net，您可以在任何平台上以相同的方式枚举设备，如下所示。见整篇文章。

var devices = await DeviceManager.Current.GetConnectedDeviceDefinitions(new FilterDeviceDefinition { VendorId = 0x1209, ProductId = 0x53C1 });
foreach (var device in devices)
{
    Debug.WriteLine(device.DeviceId);
}