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());
}
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 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 bufferID = new StringBuilder(256);
var lengthID = (uint)buffer.Capacity;
NativeMethods.SetupDiGetDeviceInstanceIdW(hDevInfoSet, ref devInfoData, bufferID, lengthID, 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 regexID = new Regex(@"\\[A-Za-z0-9]&(?<ID>[A-Fa-f0-9]*)&"); //Matches 'USB\VID_123&PID_456&REV_001' or 'root\GenericDevice'
var match = regex.Match(buffer.ToString());
var matchID = regexID.Match(bufferID.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.
}
result.Add("ID", matchID.Groups[1].ToString());
foreach (var id in match.Groups["ID"].Captures)
{
var splitIndex = id.ToString().IndexOf('_');
if (splitIndex < 0)
{
if (id.ToString().Contains("PID"))
{
result.Add("PID", id.ToString().Replace("PID", ""));
}
if (id.ToString().Contains("VID"))
{
result.Add("VID", id.ToString().Replace("VID", ""));
}
if (id.ToString().Contains("REV"))
{
result.Add("REV", id.ToString().Replace("REV", ""));
}
}
else
{
result.Add(id.ToString().Substring(0, splitIndex), id.ToString().Substring(splitIndex + 1));
}
}
return(result);
}
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);
}
public static IEnumerable <ModemDevice> EnumerateModemDevices(bool presentOnly = true)
{
var Type = "Modem";
uint n = 0;
Guid gid = new Guid();
NativeMethods.SetupDiClassGuidsFromNameW(Type, ref gid, 0, ref n);
NativeMethods.SetupDiClassGuidsFromNameW(Type, ref gid, n, ref n);
var ModemhDevInfoSet = NativeMethods.SetupDiGetClassDevs(
ref gid,
null,
IntPtr.Zero,
presentOnly ? NativeMethods.DiGetClassFlags.DIGCF_PRESENT : 0);
if (ModemhDevInfoSet.ToInt64() == NativeMethods.INVALID_HANDLE_VALUE)
{
yield break;
}
var SerialhDevInfoSet = NativeMethods.SetupDiGetClassDevs(
ref NativeMethods.GUID_DEVINTERFACE_SERENUM_BUS_ENUMERATOR,
null,
IntPtr.Zero,
presentOnly ? NativeMethods.DiGetClassFlags.DIGCF_PRESENT : 0);
if (SerialhDevInfoSet.ToInt64() == NativeMethods.INVALID_HANDLE_VALUE)
{
yield break;
}
try
{
var ModemdevInfoData = new NativeMethods.DevInfoData {
CbSize = (uint)Marshal.SizeOf <NativeMethods.DevInfoData>()
};
var SerialdevInfoData = new NativeMethods.DevInfoData {
CbSize = (uint)Marshal.SizeOf <NativeMethods.DevInfoData>()
};
for (uint i = 0; NativeMethods.SetupDiEnumDeviceInfo(ModemhDevInfoSet, i, ref ModemdevInfoData); i++)
{
var Modemid = GetDeviceIds(ModemhDevInfoSet, ModemdevInfoData);
var device = new ModemDevice
{
ModemPortName = GetPortName(ModemhDevInfoSet, ModemdevInfoData),
FriendlyName = GetFriendlyName(ModemhDevInfoSet, ModemdevInfoData),
Description = GetDescription(ModemhDevInfoSet, ModemdevInfoData),
ID = Modemid["ID"],
Vid = Modemid.ContainsKey("VID") ? (int?)int.Parse(Modemid["VID"], System.Globalization.NumberStyles.HexNumber) : null,
Pid = Modemid.ContainsKey("PID") ? (int?)int.Parse(Modemid["PID"], System.Globalization.NumberStyles.HexNumber) : null,
Rev = Modemid.ContainsKey("REV") ? (int?)int.Parse(Modemid["REV"], System.Globalization.NumberStyles.HexNumber) : null,
MI = Modemid.ContainsKey("MI") ? (int?)int.Parse(Modemid["MI"], System.Globalization.NumberStyles.HexNumber) : null,
};
for (uint j = 0; NativeMethods.SetupDiEnumDeviceInfo(SerialhDevInfoSet, j, ref SerialdevInfoData); j++)
{
var Serialid = GetDeviceIds(SerialhDevInfoSet, SerialdevInfoData);
if (Modemid["ID"] == Serialid["ID"])
{
var PortName = GetPortName(SerialhDevInfoSet, SerialdevInfoData);
var MI = Modemid.ContainsKey("MI") ? (int?)int.Parse(Serialid["MI"], System.Globalization.NumberStyles.HexNumber) : null;
switch (MI)
{
case 1: device.VoicePortName = PortName; break;
case 2: device.DiagnosePortName = PortName; break;
}
}
}
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(ModemhDevInfoSet);
NativeMethods.SetupDiDestroyDeviceInfoList(SerialhDevInfoSet);
}
}
