QList of pointers is broken in Js

[svalaskevicius]

pasted from #22:

hi @svalaskevicius, I have a question about using QList in Javascript.
I was intending to use QList in Js, and i added following code segment in qtjs-generator/metagen/qtQml_cfg.js as following:

predefinedTemplateInstances: [
'QList < QQuickGradientStop* > ', 'QList_QQuickGradientStop_Ptr',
]

And i used QList_QQuickGradientStop_Ptr in my test.js as following:

var list = new qt.QList_QQuickGradientStop_Ptr();

var stop1 = new qt.QQuickGradientStop();
var color1 = new qt.QColor("red");
stop1.setColor(color1);
console.log("in stop1:", stop1.color().value());
stop1.setPosition(0.33);
console.log("in stop1:", stop1.position());

list.append(stop1);

console.log("in list:", list.value(0).color().value());
console.log("in list:", list.value(0).position());

It comes up with the result as :

in stop1: 255
in stop1: 0.33
in list: 0
in list: 6.9415221825227e-310

In above code block, after list.append(stop1), it turned out the result the list is not correctly evaluated by stop1.

Would you please help me to find out what the problem is ? Thanks a lot ~

---

a similar, easier to reproduce testcase:

var obj = new qt.QObject();
obj.setProperty("propName", new qt.QVariant(new qt.QString("aaa")));
console.log(obj.property("propName").toString().toLatin1().constData());

var list = new qt.QList_QObject_ptr();
list.append(obj);
console.log(list.front().property("propName").toString().toLatin1().constData());

where the last line segfaults..

[svalaskevicius]

Hi @yinyi26, I've created a failing test case in cpgf (see the last link referenced in this PR) for this issue for now, but as this is a rather complicated one, I'll have to come back on that later when I have a bit more time..

Is this issue urgent for you?

[yinyi26]

Thanks @svalaskevicius a lot for your quick response, it is not so urgent for me. However in future maybe i still need to use QList of Pointer in JS, i will keep on watching on this issue :)

[svalaskevicius]

Hi @yinyi26,

@wqking has fixed the underlying issue and I can confirm it solves the problem with QList of pointers :)

I've updated cpgf in the master branch, but as it has more changes now (update to Qt5.3.2), you might want to try first by just these commands:

cd lib/cpgf
git checkout 3affe48
cd ../cpgf-build/build
rm libcpgf.so
make -j4
cd ../../../build/
make -j4

Hope it helps - please let me know if you find any more issues :)

Thanks!

[yinyi26]

Hi @svalaskevicius @wqking, I have confirmed it works fine. Thanks a lot ~