I tried to pass a bytearray and that's also not currently supported. Any clue about what should I do with the exception? It definitely shouldn't crash the process. I need it to raise a python exception instead. בתאריך 20 בינו 2015 17:49, "Amaury Forgeot d'Arc" <amaur...@gmail.com> כתב:
> 2015-01-20 16:07 GMT+01:00 Omer Katz <omer.d...@gmail.com>: > >> That's correct but can't we handle those cases in cppyy? >> We should provide a native Python interface whenever it's possible. >> > > It's not possible to take a Python string as mutable reference. > > Here are some options that cppyy could implement: > > - Use bytearray, which is mutable. > a = bytearray() > e.SerializeToString(a) > s = str(a) > > - Pass a list, and expect the function to append a (python) string > l = [] > e.SerializeToString(s) > s = l[0] > > - Change the signature of the function so that it *returns* the string > (like swig's OUTPUT > <http://www.swig.org/Doc3.0/Arguments.html#Arguments_nn5>) > result, s = e.SerializeToString() > > I don't know which method is the most convenient with cppyy. > > > >> >> 2015-01-20 15:40 GMT+02:00 Amaury Forgeot d'Arc <amaur...@gmail.com>: >> >>> Hi, >>> >>> 2015-01-20 14:14 GMT+01:00 Omer Katz <omer.d...@gmail.com>: >>> >>>> The documentation is unclear how you can pass a pointer to a Python >>>> variable e.g.: >>>> str = "" >>>> >>>> e.SerializeToString(str) >>>> >>> >>> Message::SerializeToString() updates its argument in-place, but Python >>> strings are not mutable. >>> You should allocate a std::string from Python code, and pass it to the >>> function. >>> Maybe something like: >>> >>> s = cppyy.gbl.std.string() >>> e.SerializeToString(s) >>> print s >>> >>> >>> >>> >>>> >>>> --------------------------------------------------------------------------- >>>> TypeError Traceback (most recent call >>>> last) >>>> <ipython-input-7-993880892d74> in <module>() >>>> ----> 1 e.SerializeToString(str) >>>> >>>> TypeError: none of the 5 overloaded methods succeeded. Full details: >>>> bool google::protobuf::MessageLite::SerializeToString(std::string*) => >>>> TypeError: cannot pass str as basic_string<char> >>>> bool google::protobuf::MessageLite::SerializeToString(std::string*) => >>>> TypeError: cannot pass str as basic_string<char> >>>> bool google::protobuf::MessageLite::SerializeToString(std::string*) => >>>> TypeError: cannot pass str as basic_string<char> >>>> bool google::protobuf::MessageLite::SerializeToString(std::string*) => >>>> TypeError: cannot pass str as basic_string<char> >>>> bool google::protobuf::MessageLite::SerializeToString(std::string*) => >>>> TypeError: cannot pass str as basic_string<char> >>>> >>>> Best Regards, >>>> Omer Katz. >>>> >>>> _______________________________________________ >>>> pypy-dev mailing list >>>> pypy-dev@python.org >>>> https://mail.python.org/mailman/listinfo/pypy-dev >>>> >>>> >>> >>> >>> -- >>> Amaury Forgeot d'Arc >>> >> > > > -- > Amaury Forgeot d'Arc >
_______________________________________________ pypy-dev mailing list pypy-dev@python.org https://mail.python.org/mailman/listinfo/pypy-dev
