resolver.py 文件源码

def _win32_is_nic_enabled(self, lm, guid, interface_key):
         # Look in the Windows Registry to determine whether the network
         # interface corresponding to the given guid is enabled.
         #
         # (Code contributed by Paul Marks, thanks!)
         #
         try:
             # This hard-coded location seems to be consistent, at least
             # from Windows 2000 through Vista.
             connection_key = _winreg.OpenKey(
                 lm,
                 r'SYSTEM\CurrentControlSet\Control\Network'
                 r'\{4D36E972-E325-11CE-BFC1-08002BE10318}'
                 r'\%s\Connection' % guid)

             try:
                 # The PnpInstanceID points to a key inside Enum
                 (pnp_id, ttype) = _winreg.QueryValueEx(
                     connection_key, 'PnpInstanceID')

                 if ttype != _winreg.REG_SZ:
                     raise ValueError

                 device_key = _winreg.OpenKey(
                     lm, r'SYSTEM\CurrentControlSet\Enum\%s' % pnp_id)

                 try:
                     # Get ConfigFlags for this device
                     (flags, ttype) = _winreg.QueryValueEx(
                         device_key, 'ConfigFlags')

                     if ttype != _winreg.REG_DWORD:
                         raise ValueError

                     # Based on experimentation, bit 0x1 indicates that the
                     # device is disabled.
                     return not (flags & 0x1)

                 finally:
                     device_key.Close()
             finally:
                 connection_key.Close()
         except (EnvironmentError, ValueError):
             # Pre-vista, enabled interfaces seem to have a non-empty
             # NTEContextList; this was how dnspython detected enabled
             # nics before the code above was contributed.  We've retained
             # the old method since we don't know if the code above works
             # on Windows 95/98/ME.
             try:
                 (nte, ttype) = _winreg.QueryValueEx(interface_key,
                                                     'NTEContextList')
                 return nte is not None
             except WindowsError:
                 return False