On Tue, 16 Oct 2007 18:55:22 +0000, Duncan Booth wrote:
> Sami Vaisanen <[EMAIL PROTECTED]> wrote:
>
>> Hello group,
>>
>> I'm writing a C++ based application that embeds the python engine. Now I
>> have a problem regarding exception/error information. Is there a way to
>> get the exception message and possibly the traceback into a string for
>> example? I've been eyeballing the PyErr_ module and it seems fairly
>> limited. In other words PyErr_Print() calls the right functions for
>> getting the exception information but unfortunately it is hardwired to
>> print this data directly into sys.stderr, and for an embedded application
>> this is completely inappropriate.
>>
>>
>> Please advice how to do this.
>>
> All you have to do is call whatever functions you would call from Python.
> e.g. from C you need to import traceback, then call getattr to get the
> appropriate function (e.g. format_exc or format_exception), then just call
> it.
void get_python_exception(string& message, string& traceback)
{
GIL g;
PyObject* type = NULL;
PyObject* value = NULL;
PyObject* trace = NULL;
PyErr_Fetch(&type, &value, &trace);
py_ref ref_type(type);
py_ref ref_value(value);
py_ref ref_trace(trace);
py_ref name(PyString_FromString("traceback"));
py_ref module(PyImport_Import(name.get()));
if (module)
{
py_ref fun(PyObject_GetAttrString(module.get(), "format_exc"));
if (fun)
{
PyErr_Restore(type, value, trace);
ref_type.release();
ref_value.release();
ref_trace.release();
py_ref ret(PyObject_CallObject(fun.get(), NULL));
if (ret && PyString_Check(ret.get()))
{
char* str = PyString_AsString(ret.get());
message = str;
traceback = "traceback not available";
return;
}
}
}
message = "message not available";
traceback = "traceback not available";
}
str evaluates to "None", any ideas what gives here? I've also tried to
call the traceback with a different function, such as
PyObject_CallFunctionObjArgs but the result is still same.
Thanks
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