<![CDATA[Mine field Layout problem (solved).]]>Hi everyone, I've recently started to develope a simple game (mine field) and I already have a problem.
I create a QPushButton "newGame", which purpose is to create a grid of buttons.
I post some lines of the code to help the explanation:

@
mine_field::mine_field(QWidget *parent) : QWidget(parent) {

QHBoxLayout *menuLayout = new QHBoxLayout();
QPushButton *newGame = new QPushButton(tr("New Game"));
menuLayout->addWidget(newGame);

QVBoxLayout *mainLayout = new QVBoxLayout();
mainLayout->addLayout(menuLayout);
setLayout(mainLayout);

connect(newGame, SIGNAL(clicked()), this, SLOT(create()));
}

void mine_field::create()
{
QGridLayout *buttonLayout = new QGridLayout();
for (int i=0;i<10;++i)
for (int j=0; j<10; ++j){
QPushButton *button = new QPushButton();
buttonLayout->addWidget(button, i, j);
}
mainLayout -> addLayout(buttonLayout);
}
@

I get a segmentation fault, I think because mainLayout is not defined in function create().
Anyone can help me?
Thanks.

]]>https://forum.qt.io/topic/35116/mine-field-layout-problem-solvedRSS for NodeThu, 14 May 2026 12:43:03 GMTThu, 05 Dec 2013 08:11:07 GMT60<![CDATA[Reply to Mine field Layout problem (solved). on Thu, 05 Dec 2013 17:10:13 GMT]]>You're welcome !

Since you have it working now, please update the thread title by prepending [solved] so the other forum users may know a solution has been found :)

]]>https://forum.qt.io/post/206427https://forum.qt.io/post/206427Thu, 05 Dec 2013 17:10:13 GMT<![CDATA[Reply to Mine field Layout problem (solved). on Thu, 05 Dec 2013 16:10:55 GMT]]>Ok, I resolved the problem just declaring in constructor:
@menuLayout = new QHBoxLayout ();@

Thank you for your patience :)

]]>https://forum.qt.io/post/206424https://forum.qt.io/post/206424Thu, 05 Dec 2013 16:10:55 GMT<![CDATA[Reply to Mine field Layout problem (solved). on Thu, 05 Dec 2013 13:18:54 GMT]]>Yes, I declared it in header file:
@ private:
QHBoxLayout *menuLayout; @

So instead of write in constructor:
@ QHBoxLayout *menuLayout = new QHBoxLayout (); @

Can I use it as?
@ this->menuLayout @

]]>https://forum.qt.io/post/206393https://forum.qt.io/post/206393Thu, 05 Dec 2013 13:18:54 GMT<![CDATA[Reply to Mine field Layout problem (solved). on Thu, 05 Dec 2013 12:25:23 GMT]]>Seems you already do have it as a class member. Otherwise you wouldn't be able to compile

]]>https://forum.qt.io/post/206380https://forum.qt.io/post/206380Thu, 05 Dec 2013 12:25:23 GMT<![CDATA[Reply to Mine field Layout problem (solved). on Thu, 05 Dec 2013 11:19:20 GMT]]>Thank for the answer, how can I set mainLayout as global, visible both for constructor and for create() ?

]]>https://forum.qt.io/post/206371https://forum.qt.io/post/206371Thu, 05 Dec 2013 11:19:20 GMT<![CDATA[Reply to Mine field Layout problem (solved). on Thu, 05 Dec 2013 08:21:39 GMT]]>Hi and welcome to devnet,

You are shadowing mainLayout in your constructor that's why it crashes in create()

]]>https://forum.qt.io/post/206352https://forum.qt.io/post/206352Thu, 05 Dec 2013 08:21:39 GMT