Hi Renato, Thanks for the reply. Here's some test code. (I pasted it to make it more friendly =) http://paste.pocoo.org/show/124521/
Testing it in python: http://paste.pocoo.org/show/124523/ Thanks in advance! Best Regards For the archives: === test.cpp #include "CLucene.h" #include <string> #include <boost/python.hpp> using namespace boost::python; struct wchar_t_to_python_str { static PyObject* convert(wchar_t* const& w) { string s = ""; wchar_t* w2 = w; while(*w2++ != 0){ s += *w2; } return boost::python::incref(boost::python::object(s).ptr()); } }; struct wchar_t_from_python_str { wchar_t_from_python_str() { boost::python::converter::registry::push_back( &convertible, &construct, boost::python::type_id<wchar_t>()); } static void* convertible(PyObject* obj_ptr) { if (!PyString_Check(obj_ptr)) return 0; return obj_ptr; } static void construct( PyObject* obj_ptr, boost::python::converter::rvalue_from_python_stage1_data* data) { const char* value = PyString_AsString(obj_ptr); Py_ssize_t l = PyString_Size(obj_ptr); if (value == 0) boost::python::throw_error_already_set(); void* storage = ( (boost::python::converter::rvalue_from_python_storage<wchar_t*>*) data)->storage.bytes; wchar_t* w = new wchar_t[l]; for(int i=0;i<l;i++){ w[i] = value[i]; } data->convertible = w; } }; void init_module() { to_python_converter<wchar_t*,wchar_t_to_python_str>(); wchar_t_from_python_str(); } struct Test { Test(){} wchar_t * testReturnValue(string s){ wchar_t *p=new wchar_t[s.size()]; for(string::size_type i=0; i<s.size(); ++i) p[i]=s[i]; return p; } void testArgument(wchar_t * w){ printf("ok\n"); } }; BOOST_PYTHON_MODULE(test){ init_module(); class_<Test>("Test") //.def("testReturnValue", &Test::testReturnValue) // <- desn't compile .def("testArgument", &Test::testArgument); ; } ==== testing it in python >>> import test >>> t = test.Test() >>> t.testArgument(u"") --------------------------------------------------------------------------- ArgumentError Traceback (most recent call last) /home/.../build/<ipython console> in <module>() ArgumentError: Python argument types in Test.testArgument(Test, unicode) did not match C++ signature: testArgument(Test {lvalue}, wchar_t*) >>> t.testArgument("") --------------------------------------------------------------------------- ArgumentError Traceback (most recent call last) /home/.../build/<ipython console> in <module>() ArgumentError: Python argument types in Test.testArgument(Test, str) did not match C++ signature: testArgument(Test {lvalue}, wchar_t*) >>> from ctypes import c_wchar_p >>> c_wchar_p("hello") >>> c_wchar_p(u'hello') >>> w = c_wchar_p("hello") >>> t.testArgument(w) --------------------------------------------------------------------------- ArgumentError Traceback (most recent call last) /home/nicolas/devel/CyLucene/build/<ipython console> in <module>() ArgumentError: Python argument types in Test.testArgument(Test, c_wchar_p) did not match C++ signature: testArgument(Test {lvalue}, wchar_t*) On Mon, Jun 22, 2009 at 1:48 PM, Renato Araujo<rena...@gmail.com> wrote: > Hi Nicolas, > > Can you send a simple example, where the convention fail (c++ to > python or python to c++)? What kind of test you are running? > > BR > Renato > > > > On Mon, Jun 22, 2009 at 8:31 AM, Nicolas Lara<nicolasl...@gmail.com> wrote: >> Hello, >> I'm new to Boost::Python and am encountering a problem that seem to be >> quite common: I need to expose a class to C++ whose constructor takes >> a wchar_t* as a parameter. >> The problem is that there is no default type converter from wchar_t to >> python and vice-versa. >> >> I wanted to know if there was a standard way of doing this. Or if >> anyone could point me to an implementation of this type conversion. >> >> So far I'm doing this (based on the faq): >> >> struct wchar_t_to_python_str >> { >> static PyObject* convert(wchar_t* const& w) >> { >> string s = ""; >> wchar_t* w2 = w; >> while(*w2++ != 0){ >> s += *w2; >> } >> return boost::python::incref(boost::python::object(s).ptr()); >> } >> }; >> >> struct wchar_t_from_python_str >> { >> wchar_t_from_python_str() >> { >> boost::python::converter::registry::push_back( >> &convertible, >> &construct, >> boost::python::type_id<wchar_t>()); >> } >> >> static void* convertible(PyObject* obj_ptr) >> { >> if (!PyString_Check(obj_ptr)) return 0; >> return obj_ptr; >> } >> >> static void construct( >> PyObject* obj_ptr, >> >> boost::python::converter::rvalue_from_python_stage1_data* data) >> { >> const char* value = PyString_AsString(obj_ptr); >> Py_ssize_t l = PyString_Size(obj_ptr); >> if (value == 0) boost::python::throw_error_already_set(); >> void* storage = ( >> >> (boost::python::converter::rvalue_from_python_storage<wchar_t*>*) >> data)->storage.bytes; >> >> wchar_t* w = new wchar_t[l]; >> for(int i=0;i<l;i++){ >> w[i] = value[i]; >> } >> data->convertible = w; >> } >> }; >> void init_module() >> { >> to_python_converter<wchar_t*,wchar_t_to_python_str>(); >> wchar_t_from_python_str(); >> } >> >> BOOST_PYTHON_MODULE(queryparser){ >> init_module(); >> } >> >> But it doesn't seem to be working. It compiles, but python doesn't >> understand the conversion. >> Any thoughts? >> >> >> Thanks in advance! >> >> -- >> Nicolas Lara >> Linux user #380134 >> http://nicolas-lara.blogspot.com/ >> Public key id: 0x152e7713 at http://subkeys.pgp.net/ >> _______________________________________________ >> Cplusplus-sig mailing list >> Cplusplus-sig@python.org >> http://mail.python.org/mailman/listinfo/cplusplus-sig >> > > > > -- > Renato Araujo Oliveira Filho > _______________________________________________ > Cplusplus-sig mailing list > Cplusplus-sig@python.org > http://mail.python.org/mailman/listinfo/cplusplus-sig > -- Nicolas Lara Linux user #380134 http://nicolas-lara.blogspot.com/ Public key id: 0x152e7713 at http://subkeys.pgp.net/ _______________________________________________ Cplusplus-sig mailing list Cplusplus-sig@python.org http://mail.python.org/mailman/listinfo/cplusplus-sig
