public static IEnumerable <DeviceInfo> EnumerateHidDevices()
{
var devices = new List <DeviceInfo>();
var hidClass = HidDevices.HidClassGuid;
var deviceInfoSet = NativeMethods.SetupDiGetClassDevs(
classGuid: ref hidClass,
enumerator: null,
hwndParent: 0,
flags: NativeMethods.DIGCF_PRESENT | NativeMethods.DIGCF_DEVICEINTERFACE
);
if (deviceInfoSet.ToInt64() != NativeMethods.INVALID_HANDLE_VALUE)
{
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, ref deviceInfoData, ref hidClass, deviceInterfaceIndex, ref deviceInterfaceData))
{
deviceInterfaceIndex++;
var devicePath = GetDevicePath(deviceInfoSet, deviceInterfaceData);
var description = GetBusReportedDeviceDescription(deviceInfoSet, ref deviceInfoData) ??
GetDeviceDescription(deviceInfoSet, ref deviceInfoData);
devices.Add(new DeviceInfo {
Path = devicePath,
Description = description
});
}
}
NativeMethods.SetupDiDestroyDeviceInfoList(deviceInfoSet);
}
return(devices);
}
/// <summary>
/// Document how that looks like for the controllers
/// </summary>
/// <param name="deviceInfoSet"></param>
/// <param name="deviceInterfaceData"></param>
/// <returns></returns>
private static string GetDevicePath(IntPtr deviceInfoSet, NativeMethods.SP_DEVICE_INTERFACE_DATA deviceInterfaceData)
{
var bufferSize = 0;
const int intPtrByteSize32Bits = 4;
const int intPtrByteSize64Bits = 8;
int deviceInterfaceDetailDataSize = intPtrByteSize64Bits;
if (IntPtr.Size == intPtrByteSize32Bits)
{
deviceInterfaceDetailDataSize = intPtrByteSize32Bits + Marshal.SystemDefaultCharSize;
}
var deviceInterfaceDetailData = new NativeMethods.SP_DEVICE_INTERFACE_DETAIL_DATA {
Size = deviceInterfaceDetailDataSize
};
NativeMethods.SetupDiGetDeviceInterfaceDetailBuffer(
deviceInfoSet,
ref deviceInterfaceData,
deviceInterfaceDetailData: IntPtr.Zero, // no details
deviceInterfaceDetailDataSize: 0,
requiredSize: ref bufferSize,
deviceInfoData: IntPtr.Zero
);
var success = NativeMethods.SetupDiGetDeviceInterfaceDetail(
deviceInfoSet,
ref deviceInterfaceData,
ref deviceInterfaceDetailData,
deviceInterfaceDetailDataSize: bufferSize,
requiredSize: ref bufferSize,
deviceInfoData: IntPtr.Zero
);
if (success)
{
return(deviceInterfaceDetailData.DevicePath);
}
return(null);
}
