base.py 文件源码

def __pack__(self):
        fmt = self.endian
        value_list = []
        for field in self._field_names_:
            fmt_ = self._field_format_[field]
            val = getattr(self, field)
            if isinstance(fmt_, StructArray):
                value_list.extend([
                    getattr(struct_, field)
                    for struct_ in fmt_.structure_list
                    for field in struct_._field_names_
                ])
            elif isinstance(fmt_, basestring) and (fmt_.startswith('BBB') or fmt_.startswith('bbb')):
                value_list.extend([(val >> i & 0xFF) for i in [x for x in range(0, len(fmt_) * 8, 8)]])
            else:    
                try:
                    value_list.append(val.encode('ascii', 'ignore'))
                except AttributeError:
                    value_list.append(val)
            fmt += str(len(val)) + 's' if fmt_ == 'variable' else fmt_.get_struct() if isinstance(fmt_, StructArray) else fmt_
        try:
            return struct.pack(fmt, *value_list)
        except struct.error as exc:
            raise_from(PackError("Unable to pack structure"), exc)