private static Dictionary <string, string> GetDeviceIds(IntPtr hDevInfoSet, NativeMethods.DevInfoData devInfoData)
{
var buffer = new StringBuilder(256);
var length = (uint)buffer.Capacity;
NativeMethods.SetupDiGetDeviceRegistryProperty(hDevInfoSet, ref devInfoData, NativeMethods.DeviceInfoRegistryProperty.SPDRP_HARDWAREID, out _, buffer, length, out _);
var result = new Dictionary <string, string>();
var regex = new Regex(@"(?<Enum>[^\\]*)\\((?<ID>[^&]+)&?)+"); //Matches 'USB\VID_123&PID_456&REV_001' or 'root\GenericDevice'
var match = regex.Match(buffer.ToString());
if (!match.Success || !match.Groups["ID"].Success)
{
return(result); //empty result. The ID group should always match if the match succeeded. But testing here for completeness.
}
foreach (var id in match.Groups["ID"].Captures)
{
var splitIndex = id.ToString().IndexOf('_');
if (splitIndex < 0)
{
result.Add("GENERIC", id.ToString());
}
else
{
result.Add(id.ToString().Substring(0, splitIndex), id.ToString().Substring(splitIndex + 1));
}
}
return(result);
}
private static string GetDescription(IntPtr hDevInfoSet, NativeMethods.DevInfoData devInfoData)
{
var buffer = new StringBuilder(256);
var length = (uint)buffer.Capacity;
NativeMethods.SetupDiGetDeviceRegistryProperty(hDevInfoSet, ref devInfoData, NativeMethods.DeviceInfoRegistryProperty.SPDRP_DEVICEDESC, out _, buffer, length, out _);
return(buffer.ToString());
}
private static string GetFriendlyName(IntPtr hDevInfoSet, NativeMethods.DevInfoData devInfoData)
{
var buffer = new StringBuilder(256);
var length = (uint)buffer.Capacity;
NativeMethods.SetupDiGetDeviceRegistryProperty(hDevInfoSet, ref devInfoData, NativeMethods.DeviceInfoRegistryProperty.SPDRP_FRIENDLYNAME, out _, buffer, length, out _);
return(buffer.ToString());
}
public static IEnumerable <UsbSerialDevice> EnumerateDevices(bool presentOnly = true)
{
var hDevInfoSet = NativeMethods.SetupDiGetClassDevs(
ref NativeMethods.GUID_DEVINTERFACE_SERENUM_BUS_ENUMERATOR,
null,
IntPtr.Zero,
presentOnly ? NativeMethods.DiGetClassFlags.DIGCF_PRESENT : 0);
if (hDevInfoSet.ToInt64() == NativeMethods.INVALID_HANDLE_VALUE)
{
yield break;
}
try
{
var devInfoData = new NativeMethods.DevInfoData {
CbSize = (uint)Marshal.SizeOf <NativeMethods.DevInfoData>()
};
for (uint i = 0; NativeMethods.SetupDiEnumDeviceInfo(hDevInfoSet, i, ref devInfoData); i++)
{
var id = GetDeviceIds(hDevInfoSet, devInfoData);
var device = new UsbSerialDevice
{
PortName = GetPortName(hDevInfoSet, devInfoData),
FriendlyName = GetFriendlyName(hDevInfoSet, devInfoData),
Description = GetDescription(hDevInfoSet, devInfoData),
Vid = id.ContainsKey("VID") ? (int?)int.Parse(id["VID"], System.Globalization.NumberStyles.HexNumber) : null,
Pid = id.ContainsKey("PID") ? (int?)int.Parse(id["PID"], System.Globalization.NumberStyles.HexNumber) : null,
Rev = id.ContainsKey("REV") ? (int?)int.Parse(id["REV"], System.Globalization.NumberStyles.HexNumber) : null,
};
yield return(device);
}
if (Marshal.GetLastWin32Error() != NativeMethods.NO_ERROR &&
Marshal.GetLastWin32Error() != NativeMethods.ERROR_NO_MORE_ITEMS)
{
throw new Win32Exception(Marshal.GetLastWin32Error(), $"Failed to enumerate USB serial devices. Error: [{Marshal.GetLastWin32Error()}] HR: [{Marshal.GetHRForLastWin32Error()}]");
}
}
finally
{
NativeMethods.SetupDiDestroyDeviceInfoList(hDevInfoSet);
}
}
private static string GetPortName(IntPtr hDevInfoSet, NativeMethods.DevInfoData devInfoData)
{
var hRegKey = NativeMethods.SetupDiOpenDevRegKey(
hDevInfoSet,
ref devInfoData,
NativeMethods.DeviceInfoPropertyScope.DICS_FLAG_GLOBAL,
0,
NativeMethods.DeviceInfoRegistryKeyType.DIREG_DEV,
NativeMethods.RegistrySpecificAccessRights.KEY_QUERY_VALUE);
if (hRegKey == IntPtr.Zero)
{
return(string.Empty);
}
var safeHandle = new SafeRegistryHandle(hRegKey, true);
var key = RegistryKey.FromHandle(safeHandle);
return(key.GetValue(@"PortName") as string);
}
