Hi Nicolas
At my first look I get this working changing the register function:
<< to_python_converter<wchar_t*,wchar_t_to_python_str>();
>> to_python_converter<wchar_t,wchar_t_to_python_str>();
<< static PyObject* convert(wchar_t* const& w)
>> static PyObject* convert(wchar_t const& w)
<< wchar_t* w2 = w;
<< while(*w2++ != 0){
<< s += *w2;
>> wchar_t w2 = w;
>> while(w2++ != 0){
>> s += w2;
and the function signature:
<< void testArgument(wchar_t * w){
>> void testArgument(const wchar_t &w){
this make everything works fine:
I don't know how get this working with wchar_t* in function signature.
Maybe create a class_ for w_char_t.
On Mon, Jun 22, 2009 at 2:27 PM, Nicolas Lara<nicolasl...@gmail.com> wrote:
> 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
>
--
BR
Renato Araujo Oliveira Filho
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