Dear Phil,
wishing you a successful and pleasable 2013.
You might want to look into the attached issue. It looks like it is a sip
issue, althrough
I wouldn't exclude PyKDE wrapper issues here...
Cheers,
Pete
-- Weitergeleitete Nachricht --
Betreff: [Kde-bindings] problem with sip api 2 for QString
Datum: Freitag, 28. Dezember 2012, 15:03:17
Von: Wolfgang Rohdewald
An: KDE bindings for other programming languages
Hi,
could somebody please have a look at bug 253123?
https://bugs.kde.org/show_bug.cgi?id=253123
without this being fixed I will never be able to port the kde game kajongg to
the new API. I want to change to the new API before trying the port to python3.
re-tested again today:
the full test script is:
#!/usr/bin/env python3
import sip
sip.setapi('QString', 2)
from PyKDE4.kdeui import KConfigSkeleton
a = KConfigSkeleton()
name = 'tilesetName'
value = 'I am a value'
s = a.addItemString(name, value)
print('s.value():', s.value()) # - this prints random garbage,
accessing a freed object
doing something similar with addItemInt works.
it seems the code generated by sip frees the string value object when it should
not (by calling
sipReleaseType)
I know nothing about sip, so I have no idea how to fix this. That bug was
always there
since I reported it in oct 2010, now I get it with pykde4-4.9.4 with both
python 2.7.3 and
python 3.2 - so it really is version independent.
valgrind says
==6835== Invalid read of size 8
==6835==at 0x99C74CB: QString::toUcs4() const (in
/usr/lib/x86_64-linux-gnu/libQtCore.so.4.8.3)
==6835==by 0xF1B698F: ??? (in
/usr/lib/python3/dist-packages/PyQt4/QtCore.cpython-32mu.so)
==6835==by 0x79CFB38: sip_api_convert_from_type (in
/usr/lib/python3/dist-packages/sip.cpython-32mu.so)
==6835==by 0x1061B01B: meth_KCoreConfigSkeleton_ItemString_value
(sipkdecorepart6.cpp:12455)
==6835== Address 0x112f4800 is 0 bytes inside a block of size 8 free'd
==6835==at 0x4C2A44B: operator delete(void*) (in
/usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
==6835==by 0xF0FB872: ??? (in
/usr/lib/python3/dist-packages/PyQt4/QtCore.cpython-32mu.so)
==6835==by 0x106361F4: meth_KCoreConfigSkeleton_addItemString
(sipkdecorepart6.cpp:13726)
extracts from sipkdecorepart6.cpp (generated on kubuntu with apt-get --compile
source python-kde4):
extern "C" {static PyObject *meth_KCoreConfigSkeleton_ItemString_value(PyObject
*, PyObject *);}
static PyObject *meth_KCoreConfigSkeleton_ItemString_value(PyObject *sipSelf,
PyObject *sipArgs)
{
PyObject *sipParseErr = NULL;
{
KCoreConfigSkeleton::ItemString *sipCpp;
if (sipParseArgs(&sipParseErr, sipArgs, "B", &sipSelf,
sipType_KCoreConfigSkeleton_ItemString, &sipCpp))
{
QString *sipRes;
Py_BEGIN_ALLOW_THREADS
sipRes = &sipCpp->value(); --- this is line
12455
Py_END_ALLOW_THREADS
return sipConvertFromType(sipRes,sipType_QString,NULL);
}
}
extern "C" {static PyObject *meth_KCoreConfigSkeleton_addItemString(PyObject *,
PyObject *);}
static PyObject *meth_KCoreConfigSkeleton_addItemString(PyObject *sipSelf,
PyObject *sipArgs)
{
PyObject *sipParseErr = NULL;
{
const QString * a0;
int a0State = 0;
QString * a1;
int a1State = 0;
const QString& a2def = QLatin1String("");
const QString * a2 = &a2def;
int a2State = 0;
const QString& a3def = QString();
const QString * a3 = &a3def;
int a3State = 0;
KCoreConfigSkeleton *sipCpp;
if (sipParseArgs(&sipParseErr, sipArgs, "BJ1J1|J1J1", &sipSelf,
sipType_KCoreConfigSkeleton, &sipCpp, sipType_QString,&a0, &a0State,
sipType_QString,&a1, &a1State, sipType_QString,&a2, &a2State,
sipType_QString,&a3, &a3State))
{
KCoreConfigSkeleton::ItemString *sipRes;
Py_BEGIN_ALLOW_THREADS
sipRes = sipCpp->addItemString(*a0,*a1,*a2,*a3);
Py_END_ALLOW_THREADS
sipReleaseType(const_cast(a0),sipType_QString,a0State);
sipReleaseType(a1,sipType_QString,a1State);
--- this is line 13726
sipReleaseType(const_cast(a2),sipType_QString,a2State);
sipReleaseType(const_cast(a3),sipType_QString,a3State);
return
sipConvertFromType(sipRes,sipType_KCoreConfigSkeleton_ItemString,NULL);
}
--
Wolfgang
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