[C++-sig] type convert: python file <-> C++ FILE*

[Liwei Peng]

Hi,

For converting python file to/from C++ FILE*,
I tried the suggested code. It didn't work.
I got the same error message like before.

Here is my c++ code:
-----------------------------------------
#include <boost/python.hpp>

namespace python = boost::python;

struct FILE_to_pyfile
{
    static PyObject* convert(FILE const& x)
    {        
	return PyFile_FromFile((FILE*)(&x), "", "", NULL);
    }
};

FILE* getfile(const char* fname)
{
    printf("openning file: %s\n", fname);
    FILE* f = fopen(fname, "w");
    fprintf(f, "initial words\n");
    return f;
}

BOOST_PYTHON_MODULE(numbermod)
{
    python::to_python_converter<FILE,
FILE_to_pyfile>();
    python::def("getfile", getfile,
	
python::return_value_policy<python::reference_existing_object>());
}

--------------------------------
The only change I made to the suggested code is
to cast "&x" (whose type is const FILE*) to 'FILE*".
Without this, the code won't compile.

Here is how I compile the code:
---------------------------------
g++ -I/usr/include/python2.2 -fPIC  -c number_wrap1.C
g++ -shared number_wrap1.o  -o numbermod.so
-lboost_python

--------------------------
I am using g++ 3.2, python 2.2.1.

The error message from python code:
-------------------------------------------

Python 2.2.1 (#1, Sep  9 2002, 09:26:21)
[GCC 3.2 (Mandrake Linux 9.0 3.2-1mdk)] on linux-i386
Type "help", "copyright", "credits" or "license" for
more information.
>>>
>>> from numbermod import *
>>> f = getfile('hello.txt')
Traceback (most recent call last):
  File "<stdin>", line 1, in ?
TypeError: bad argument type for built-in operation
>>>

Can anyone please help me out?

Thanks in advance,

liwei

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