translating C++ exceptions to python

[calin.hanchevici]

Hi all,

I have a C++ library I call from python. The problem is I have c++
exceptions that i want to be translated to python. I want to be able to
do stuff like:
try:
my_cpp_function ()
except cpp_exception_1 :
do_stuff
except cpp_exception_2 :
do_other_stuff

any ideas how can i do the translation?
Thanks, calin

[Denis S. Otkidach]

On 13 Jun 2005 04:23:03 -0700
ca************* *@gmail.com wrote:

Hi all,

I have a C++ library I call from python. The problem is I have c++
exceptions that i want to be translated to python. I want to be able to
do stuff like:
try:
my_cpp_function ()
except cpp_exception_1 :
do_stuff
except cpp_exception_2 :
do_other_stuff

any ideas how can i do the translation?

1. Create Python class for your exception. For simple case the code
will be:

static PyObject *YouExceptionCl ass;

# and in module initialization function:
YouExceptionCla ss = PyErr_NewExcept ion("YourModule .YourException" , 0, 0);

2. Add it to module dictionary.

3. In wrapper for my_cpp_function use something like the following
code:

try {
my_cpp_function _impl();
} catch (YouException &exc) {
PyErr_SetString (YouExceptionCl ass, exc.what());
return 0;
}

--
Denis S. Otkidach
http://www.python.ru/ [ru]

[harold fellermann]

On 13.06.2005, at 13:23, ca************* *@gmail.com wrote:

Hi all,

I have a C++ library I call from python. The problem is I have c++
exceptions that i want to be translated to python. I want to be able to
do stuff like:
try:
my_cpp_function ()
except cpp_exception_1 :
do_stuff
except cpp_exception_2 :
do_other_stuff

any ideas how can i do the translation?

If you do not already use it, have a look at
http://www.boost.org/libs/python/ a C++ -- library to wrap the
Python C API, i.e. it helps you to extend Python in C++.
AFAIK it has fascilities to transform exceptions from one type
into the other.

- harold -

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