C# 使用SetupApi获取SPDRP_LOCATION_PATHS

在C#中使用SetupApi获取SPDRP_LOCATION_PATHS的步骤如下：

1. 首先要导入`SetupApi`相关的命名空间：

using System.Runtime.InteropServices;
using System.Text;
using Microsoft.Win32.SafeHandles;

2. 定义`SetupApi`中相关的结构体和常量：

private const int DIGCF_ALLCLASSES = 0x00000004;
private const int DIGCF_PRESENT = 0x00000002;
private const int SPDRP_LOCATION_PATHS = 0x0015;
private const int MAX_DEVICE_ID_LEN = 200;

[StructLayout(LayoutKind.Sequential)]
public struct SP_DEVINFO_DATA
{
    public int cbSize;
    public Guid ClassGuid;
    public int DevInst;
    public IntPtr Reserved;
}

[StructLayout(LayoutKind.Sequential)]
public struct SP_DEVICE_INTERFACE_DATA
{
    public int cbSize;
    public Guid InterfaceClassGuid;
    public int Flags;
    public IntPtr Reserved;
}

[StructLayout(LayoutKind.Sequential)]
public struct SP_DEVICE_INTERFACE_DETAIL_DATA
{
    public int cbSize;
    [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 256)]
    public string DevicePath;
}

[DllImport("setupapi.dll", SetLastError = true)]
public static extern IntPtr SetupDiGetClassDevs(ref Guid ClassGuid, IntPtr Enumerator, IntPtr hwndParent, int Flags);

[DllImport("setupapi.dll", SetLastError = true)]
public static extern bool SetupDiEnumDeviceInfo(IntPtr DeviceInfoSet, int MemberIndex, ref SP_DEVINFO_DATA DeviceInfoData);

[DllImport("setupapi.dll", SetLastError = true)]
public static extern bool SetupDiEnumDeviceInterfaces(IntPtr DeviceInfoSet, ref SP_DEVINFO_DATA DeviceInfoData, ref Guid InterfaceClassGuid, int MemberIndex, ref SP_DEVICE_INTERFACE_DATA DeviceInterfaceData);

[DllImport("setupapi.dll", SetLastError = true, CharSet = CharSet.Auto)]
public static extern bool SetupDiGetDeviceInterfaceDetail(IntPtr DeviceInfoSet, ref SP_DEVICE_INTERFACE_DATA DeviceInterfaceData, IntPtr DeviceInterfaceDetailData, int DeviceInterfaceDetailDataSize, ref int RequiredSize, IntPtr DeviceInfoData);

[DllImport("setupapi.dll", SetLastError = true)]
public static extern bool SetupDiDestroyDeviceInfoList(IntPtr DeviceInfoSet);

[DllImport("setupapi.dll", CharSet = CharSet.Auto, SetLastError = true)]
public static extern bool SetupDiGetDeviceRegistryProperty(IntPtr DeviceInfoSet, ref SP_DEVINFO_DATA DeviceInfoData, int Property, out int PropertyRegDataType, StringBuilder PropertyBuffer, int PropertyBufferSize, out int RequiredSize);

3. 实现获取设备路径的方法`GetDevicePath`：

public static string GetDevicePath(Guid classGuid)
{
    IntPtr deviceInfoSet = SetupDiGetClassDevs(ref classGuid, IntPtr.Zero, IntPtr.Zero, DIGCF_ALLCLASSES | DIGCF_PRESENT);
    if (deviceInfoSet == IntPtr.Zero)
    {
        return null;
    }

    SP_DEVINFO_DATA deviceInfoData = new SP_DEVINFO_DATA();
    deviceInfoData.cbSize = Marshal.SizeOf(typeof(SP_DEVINFO_DATA));
    int memberIndex = 0;
    while (SetupDiEnumDeviceInfo(deviceInfoSet, memberIndex, ref deviceInfoData))
    {
        StringBuilder deviceInstanceId = new StringBuilder(MAX_DEVICE_ID_LEN);
        if (SetupDiGetDeviceRegistryProperty(deviceInfoSet, ref deviceInfoData, SPDRP_LOCATION_PATHS, out _, deviceInstanceId, MAX_DEVICE_ID_LEN, out _))
        {
            return deviceInstanceId.ToString();
        }

        memberIndex++;
    }

    SetupDiDestroyDeviceInfoList(deviceInfoSet);
    return null;
}

4. 调用`GetDevicePath`方法获取设备路径：

Guid classGuid = new Guid("{4d36e978-e325-11ce-bfc1-08002be10318}"); // USB设备类GUID
string devicePath = GetDevicePath(classGuid);

以上就是在C#中使用SetupApi获取SPDRP_LOCATION_PATHS的方法。