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/
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