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Re: C extension module doesn't throw exception after setting error indicator through PyErr_SetString()

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On 02/08/2012 09:57, rahul wrote:
> I am implementing a C extension module, during this I saw that when I
> set the global error indicator and error message through
> PyErr_SetString() API and return false.
> 
> But it doesn't throw any error when I tried to check the error
> through sys.exc_info() then it returns (NULL, NULL, NULL) tuple.
> 
> When I return NULL through the C extension module's function then it
> works correctly and throws the exception as expected.
> 
> The skeleton looks like:
> 
> static PyObject* check(PyObject* sef, PyObject* args) { PyObject*
> input = NULL; if (!PyArg_ParseTuple(args, "O", &input)){ return
> NULL; } ..... ..... PyErr_SetString(PyExc_Exception, "Throwing Error
> through check function"); Py_RETURN_FALSE; }
> 
> Any idea on why this is happening? Any help will be appreciated.


Because you're returning False. You should be returning NULL. Which is
why it works when you do :)

Have a look at the first line of this page:

http://docs.python.org/py3k/extending/extending.html#intermezzo-errors-and-exceptions


Which piece of documentation led you to think that returning False was
the thing to do here? Perhaps there's a doc that needs fixing?


TJG

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C extension module doesn't throw exception after setting error indicator through PyErr_SetString() rahul <rahul03535@gmail.com> - 2012-08-02 01:57 -0700
  Re: C extension module doesn't throw exception after setting error indicator through PyErr_SetString() Tim Golden <mail@timgolden.me.uk> - 2012-08-02 10:06 +0100
    Re: C extension module doesn't throw exception after setting error indicator through PyErr_SetString() rahul <rahul03535@gmail.com> - 2012-08-02 02:21 -0700
    Re: C extension module doesn't throw exception after setting error indicator through PyErr_SetString() rahul <rahul03535@gmail.com> - 2012-08-02 02:21 -0700
      Re: C extension module doesn't throw exception after setting error indicator through PyErr_SetString() Tim Golden <mail@timgolden.me.uk> - 2012-08-02 10:37 +0100
        Re: C extension module doesn't throw exception after setting error indicator through PyErr_SetString() rahul <rahul03535@gmail.com> - 2012-08-02 02:50 -0700
          Re: C extension module doesn't throw exception after setting error indicator through PyErr_SetString() Tim Golden <mail@timgolden.me.uk> - 2012-08-02 11:45 +0100
          Re: C extension module doesn't throw exception after setting error indicator through PyErr_SetString() Stefan Behnel <stefan_ml@behnel.de> - 2012-08-02 12:54 +0200
        Re: C extension module doesn't throw exception after setting error indicator through PyErr_SetString() rahul <rahul03535@gmail.com> - 2012-08-02 02:50 -0700

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