'Take a unique identifier associated with a file descriptor which must
have been received by now and use it to look up that descriptor in a
dictionary where they are kept.
@param inString: The base representation (as a byte string) of an
ordinal indicating which file descriptor corresponds to this usage
of this argument.
@type inString: C{str}
@param proto: The protocol used to receive this descriptor.  This
protocol must be connected via a transport providing
L{IUNIXTransport<twisted.internet.interfaces.IUNIXTransport>}.
@type proto: L{BinaryBoxProtocol}
@return: The file descriptor represented by C{inString}.
@rtype: C{int}'

def fromStringProto(self, inString, proto):

    return proto._getDescriptor(int(inString))
