Microsoft.Win32.RegistryKey.InternalSubKeyCountCore C# (CSharp) 메소드

        private int InternalSubKeyCountCore()
        {
            int subkeys = 0;
            int junk = 0;
            int ret = Interop.Advapi32.RegQueryInfoKey(_hkey,
                                      null,
                                      null,
                                      IntPtr.Zero,
                                      ref subkeys,  // subkeys
                                      null,
                                      null,
                                      ref junk,     // values
                                      null,
                                      null,
                                      null,
                                      null);

            if (ret != 0)
            {
                Win32Error(ret, null);
            }

            return subkeys;
        }