Send a 'picture' message to the socket (or actor). This is a va_list
version of zsock_send (), so please consult its documentation for the
details.

def vsend(self, picture, argptr):
        """
        Send a 'picture' message to the socket (or actor). This is a va_list
version of zsock_send (), so please consult its documentation for the
details.
        """
        return lib.zsock_vsend(self._as_parameter_, picture, argptr)