QVariant
QPython::getattr(QVariant obj, QString attr) {
if (!SINCE_API_VERSION(1, 4)) {
emitError(QString("Import PyOtherSide 1.4 or newer to use getattr()"));
return QVariant();
}
ENSURE_GIL_STATE;
PyObjectRef pyobj(convertQVariantToPyObject(obj), true);
if (!pyobj) {
emitError(QString("Failed to convert %1 to python object: '%1' (%2)").arg(obj.toString()).arg(priv->formatExc()));
return QVariant();
}
QByteArray byteArray = attr.toUtf8();
const char *attrStr = byteArray.data();
PyObjectRef o(PyObject_GetAttrString(pyobj.borrow(), attrStr), true);
if (!o) {
emitError(QString("Attribute not found: '%1' (%2)").arg(attr).arg(priv->formatExc()));
return QVariant();
}
return convertPyObjectToQVariant(o.borrow());
}
void
TestPyOtherSide::testConvertToPythonAndBack()
{
QVariantList l;
l << "Hello" << 123 << 45.667 << true;
QVariantList l2;
l2 << "A" << QVariant() << "B" << 4711;
l << QVariant(l2);
QVariant v(l);
PyObject *o = convertQVariantToPyObject(v);
QVariant v2 = convertPyObjectToQVariant(o);
QVERIFY(v == v2);
}
PyObject *
pyotherside_qrc_list_dir(PyObject *self, PyObject *dirname)
{
QString qdirname = qstring_from_pyobject_arg(dirname);
if (qdirname.isNull()) {
return NULL;
}
QDir dir(":" + qdirname);
if (!dir.exists()) {
PyErr_SetString(PyExc_ValueError, "Directory not found");
return NULL;
}
return convertQVariantToPyObject(dir.entryList());
}
void
TestPyOtherSide::testPyObjectRefRoundTrip()
{
// Simulate a complete round-trip of a PyObject reference, from PyOtherSide
// to QML and back.
// Create a Python object, i.e. in a Python function.
bool destructor_called = false;
PyObject *o = PyCapsule_New(&destructor_called, "test", destruct);
QVERIFY(o->ob_refcnt == 1);
// Convert the object to a QVariant and increment its refcount.
QVariant v = convertPyObjectToQVariant(o);
// Decrement refcount and pass QVariant to QML.
QVERIFY(o->ob_refcnt == 2);
Py_DECREF(o);
QVERIFY(o->ob_refcnt == 1);
// Pass QVariant back to PyOtherSide, which converts it to a PyObject,
// incrementing its refcount.
PyObject *o2 = convertQVariantToPyObject(v);
QVERIFY(o->ob_refcnt == 2);
// The QVariant is deleted, i.e. by a JS variable falling out of scope.
// This deletes the PyObjectRef and thus decrements the object's refcount.
v = QVariant();
// At this point, we only have one reference (the one from o2)
QVERIFY(o->ob_refcnt == 1);
// There's still a reference, so the destructor must not have been called
QVERIFY(!destructor_called);
// Now, at this point, the last remaining reference is removed, which
// will cause the destructor to be called
Py_DECREF(o2);
// There are no references left, so the capsule's destructor is called.
QVERIFY(destructor_called);
}
QVariant
QPython::call_sync(QVariant func, QVariant args)
{
ENSURE_GIL_STATE;
PyObjectRef callable;
QString name;
if (SINCE_API_VERSION(1, 4)) {
if (static_cast<QMetaType::Type>(func.type()) == QMetaType::QString) {
// Using version >= 1.4, but func is a string
callable = PyObjectRef(priv->eval(func.toString()), true);
name = func.toString();
} else {
// Try to interpret "func" as a Python object
callable = PyObjectRef(convertQVariantToPyObject(func), true);
PyObjectRef repr = PyObjectRef(PyObject_Repr(callable.borrow()), true);
name = convertPyObjectToQVariant(repr.borrow()).toString();
}
} else {
// Versions before 1.4 only support func as a string
callable = PyObjectRef(priv->eval(func.toString()), true);
name = func.toString();
}
if (!callable) {
emitError(QString("Function not found: '%1' (%2)").arg(name).arg(priv->formatExc()));
return QVariant();
}
QVariant v;
QString errorMessage = priv->call(callable.borrow(), name, args, &v);
if (!errorMessage.isNull()) {
emitError(errorMessage);
}
return v;
}