Serial port enumeration in Delphi using SetupDiGetClassDevs

Question

I\'m trying to enumerate \"friendly names\" for COM ports. The ports may dynamically change as USB-serial devices are connected and disconnected at runtime.

Based on

Answer 1

The following procedure is working correctly for me (in Windows 8.1). It is important to use the parameter KEY_READ in the TRegistry.Constructor.

procedure  EnumComPorts(const   Ports:  TStringList);

var
  nInd:  Integer;

begin  { EnumComPorts }
  with  TRegistry.Create(KEY_READ)  do
    try
      RootKey := HKEY_LOCAL_MACHINE;
      if  OpenKey('hardware\devicemap\serialcomm', False)  then
        try
          Ports.BeginUpdate();
          try
            GetValueNames(Ports);
            for  nInd := Ports.Count - 1  downto  0  do
              Ports.Strings[nInd] := ReadString(Ports.Strings[nInd]);
            Ports.Sort()
          finally
            Ports.EndUpdate()
          end { try-finally }
        finally
          CloseKey()
        end { try-finally }
      else
        Ports.Clear()
    finally
      Free()
    end { try-finally }
end { EnumComPorts };