private static string GetDevicePath(IntPtr deviceInfoSet, NativeMethods.SP_DEVICE_INTERFACE_DATA deviceInterfaceData)
{
var bufferSize = 0;
var interfaceDetail = new NativeMethods.SP_DEVICE_INTERFACE_DETAIL_DATA {
Size = IntPtr.Size == 4 ? 4 + Marshal.SystemDefaultCharSize : 8
};
NativeMethods.SetupDiGetDeviceInterfaceDetailBuffer(deviceInfoSet, ref deviceInterfaceData, IntPtr.Zero, 0, ref bufferSize, IntPtr.Zero);
return(NativeMethods.SetupDiGetDeviceInterfaceDetail(deviceInfoSet, ref deviceInterfaceData, ref interfaceDetail, bufferSize, ref bufferSize, IntPtr.Zero) ?
interfaceDetail.DevicePath : null);
}
private static IEnumerable <string> EnumerateHidDevices()
{
var hidClass = HidClassGuid;
var deviceInfoSet = NativeMethods.SetupDiGetClassDevs(ref hidClass, null, 0, NativeMethods.DIGCF_PRESENT | NativeMethods.DIGCF_DEVICEINTERFACE);
if (deviceInfoSet.ToInt64() != NativeMethods.INVALID_HANDLE_VALUE)
{
var devices = new List <string>();
var deviceInfoData = CreateDeviceInfoData();
var deviceIndex = 0;
while (NativeMethods.SetupDiEnumDeviceInfo(deviceInfoSet, deviceIndex, ref deviceInfoData))
{
deviceIndex += 1;
var deviceInterfaceData = new NativeMethods.SP_DEVICE_INTERFACE_DATA();
deviceInterfaceData.cbSize = Marshal.SizeOf(deviceInterfaceData);
var deviceInterfaceIndex = 0;
while (NativeMethods.SetupDiEnumDeviceInterfaces(deviceInfoSet, 0, ref hidClass, deviceInterfaceIndex, ref deviceInterfaceData))
{
deviceInterfaceIndex++;
var devicePath = GetDevicePath(deviceInfoSet, deviceInterfaceData);
if (devices.Any(x => x == devicePath))
{
continue;
}
devices.Add(devicePath);
}
}
NativeMethods.SetupDiDestroyDeviceInfoList(deviceInfoSet);
foreach (string devicePath in devices)
{
yield return(devicePath);
}
}
}