[C++-sig] [pybindgen] Problems on PyObject* param

[Olaf Peter]

Hi,

I try out some binding generator tools and start with pybindgen :)

Anyway, here my script:


import pybindgen
import sys

# convinience
param=pybindgen.param
retval=pybindgen.retval

mod = pybindgen.Module('redirector')
mod.add_include('"redirector.hpp"')

stdout_py = mod.add_class('StdoutPy')
stdout_py.add_constructor([])
stdout_py.add_method('write', None, [param('PyObject*', 'value')])
stdout_py.add_method('flush', None, [])

stderr_py = mod.add_class('StderrPy')
stderr_py.add_constructor([])
stderr_py.add_method('write', None, [param('PyObject*', 'value')])
stderr_py.add_method('flush', None, [])

stdin_py  = mod.add_class('StdinPy')
stdin_py.add_constructor([])
stdin_py.add_method('readline', retval('PyObject*'), [param('PyObject*',
'value')])

mod.generate(sys.stdout)

for this classes:

	class PyConsole;

	class StdoutPy
		: public boost::noncopyable
	{
	public:
		StdoutPy(PyConsole* console);
		void write(PyObject* args);
		void flush();
	private:
		PyConsole*			m_console;
	};


	class StderrPy
		: public boost::noncopyable
	{
	public:
		StderrPy(PyObject* console);
		void write(PyObject* args);
		void flush();
	private:
		PyConsole*			m_console;
	};


	class StdinPy
		: public boost::noncopyable
	{
	public:
		StdinPy(PyConsole* console);
		PyObject* readline(PyObject* args);
	private:
		PyConsole*			m_console;
	};

as you assume, topic is redirection of the sys write function to a gui.
Anyway, I've got errors. Any help?

$ python redirector.py
/usr/lib/python2.5/site-packages/pybindgen/typehandlers/base.py:1173:
UserWarning: Exception '__init__() takes at least 4 arguments (3 given)'
in type handler <class
'pybindgen.typehandlers.pyobjecttype.PyObjectParam'> constructor
  warnings.warn("Exception %r in type handler %s constructor" %
(str(ex), type_handler_class))
Traceback (most recent call last):
  File "redirector.py", line 13, in <module>
    stdout_py.add_method('write', None, [param('PyObject*', 'value')])
  File "/usr/lib/python2.5/site-packages/pybindgen/cppclass.py", line
1127, in add_method
    meth = CppMethod(*args, **kwargs)
  File "/usr/lib/python2.5/site-packages/pybindgen/cppmethod.py", line
104, in __init__
    parameters = [utils.eval_param(param, self) for param in parameters]
  File "/usr/lib/python2.5/site-packages/pybindgen/utils.py", line 205,
in eval_param
    TypeLookupError))
  File "/usr/lib/python2.5/site-packages/pybindgen/utils.py", line 115,
in call_with_error_handling
    return callable(*args, **kwargs)
  File
"/usr/lib/python2.5/site-packages/pybindgen/typehandlers/base.py", line
1171, in new
    return type_handler_class(*args, **kwargs)
TypeError: __init__() takes at least 4 arguments (3 given)

The idea is to create the object in C++ and then set it to python,
inside PyConsole class like:

stdoutPy = new StdoutPy(this);
...
PySys_SetObject("stdout", stdoutPy);

and the redirect the member calls from python into C++.

Thanks,
Olaf