QLabel pointer - seg fault

[Tomasz]

Hello!

I've got some problems with QLabel and pointers. I've created window with 4 labels. Then in my include file I've got something like this:

class app : public QDialog
{
    Q_OBJECT
 
public:
[...]
 
public slots:
[..]
 
private:
    QLabel *myLabels[4]; 
};

class app : public QDialog
{
    Q_OBJECT

public:
[...]

public slots:
[..]

private:
    QLabel *myLabels[4]; 
};

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In app.cpp I've got:

[...]
{
    ui->setupUi(this);
[...]
 
myLabels[0]=ui->label1;
myLabels[1]=ui->label2;
myLabels[2]=ui->label3;
myLabels[3]=ui->label4;
}

[...]
{
    ui->setupUi(this);
[...]

myLabels[0]=ui->label1;
myLabels[1]=ui->label2;
myLabels[2]=ui->label3;
myLabels[3]=ui->label4;
}

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And then I've got function:

bool app::myFunc()
{
for (int i=0; i<4; i++)
{
myLabels[i]->setText( "test" );
}
}

bool app::myFunc()
{
for (int i=0; i<4; i++)
{
myLabels[i]->setText( "test" );
}
}

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And myFunc() causes segmentation fault. Any idea why?

When I do:

ui->label1->setText( "test" );

ui->label1->setText( "test" );

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Everything is OK.

thanks in advance
best regards
Tomasz

[wysota]

Please provide a minimal compilable example reproducing the problem.

[FelixB]

maybe you forgot to initialize your array?

maybe you call myFunc before assigning the labels to the array?

[Tomasz]

maybe you call myFunc before assigning the labels to the array?

I've analysed my code, and You're right. My stupid mistake.

thanks
best regards
Tomasz