On 2019-04-23 20:21, Vincent Vande Vyvre wrote:
Le 23/04/19 à 20:54, Chris Angelico a écrit :
On Wed, Apr 24, 2019 at 4:47 AM Vincent Vande Vyvre
<vincent.vande.vy...@telenet.be> wrote:
Into the lib:
static int
ImgProc_init(ImgProc *self, PyObject *args, PyObject *kwds)
{
PyObject *tmp;
char *fname;
if (!PyArg_ParseTuple(args, "s", &fname))
return NULL;
tmp = self->src;
self->src = PyUnicode_FromString(fname);
Py_XDECREF(tmp);
return 0;
}
If i do:
try:
tif = ImgProc(123)
except Exception as why:
print(sys.exc_info())
raise
I get:
(<class 'SystemError'>, SystemError("<class '_liboqapy.ImgProc'>
returned a result with an error set",), <traceback object at
0x7f3bcac748c8>)
TypeError: argument 1 must be str, not int
The above exception was the direct cause of the following exception:
Traceback (most recent call last):
File "/home/vincent/oqapy-3/trunk/filters/ui_lenscorrection.py", line
104, in on_main_cursor_changed
self.prepare_preview_process()
File "/home/vincent/oqapy-3/trunk/filters/ui_lenscorrection.py", line
137, in prepare_preview_process
self.main.process_on_preview(params)
File "/home/vincent/oqapy-3/trunk/filters/lenscorrection.py", line
56, in process_on_preview
tif = ImgProc(123)
SystemError: <class '_liboqapy.ImgProc'> returned a result with an error set
--------------------------------------------------------------------------------
Why a SystemError ?
The SystemError means that you're using the Python C API in a way that
doesn't make sense to the interpreter. You're leaving a marker saying
"hey, I need you to throw an exception" but then you're also returning
a value. You'll need to figure out where that's happening and exactly
what is being called. How are you setting up your class?
ChrisA
The syntaxe
if (!PyArg_ParseTuple(args, "s", &fname))
return NULL;
Is the usage described in the doc [*]
And without block try-except I get the good one error.
[*]
https://docs.python.org/3.5//extending/extending.html#back-to-the-example
If you look at the previous example, the function's return type is
"PyObject *".
On success it returns a reference (pointer) to an object; on error it
returns NULL.
Your function's return type is int.
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