ui->addTab "index out of range" !?

[Niagarer]

@SGaist
uuuhhm..
I'm sorry, can you give me a link or sth. where I can see how...
Unfortunately don't really know what you mean... (do you men an exeption output? )

[SGaist]

What platform are you on ?

[Niagarer]

@SGaist
windows 10 x64

[SGaist]

MinGW or Visual Studio ?

[Niagarer]

@SGaist
MinGW 32bit

[SGaist]

Then you already have a debugger. Just start your application in debug mode, make it crash and you'll have the stack trace.

[Niagarer]

@SGaist
There is nothing under Stack when I am debugging...
Are my settings wrong? I can't find anything wrong.
Also nothing under Breakpoints, Threads, Modules, Source Files, Snapshots and Registers.
Only the Debugger Log shows content

[SGaist]

Silly question but are you starting the application as usual or are you starting it with the other button which means "debug the application" ?

[Niagarer]

@SGaist
No, I click Start Debugging
(but as I see now, there is Output in Modules tab when I am not closing the error message but it doesn't matter I think)

[Niagarer]

@SGaist
UPDATE
Ok now I know, there are two points in my function, where the program crashes.
My function:

    GraphWidget *newGraphWidget = new GraphWidget(this);
    graphWidgets.append(newGraphWidget);
    QString name = "tab " + QString::number(tabCounter);

    qDebug() << ui->Graph->currentIndex();

    //ui->Graph->addTab(newGraphWidget, "title");          // !? PROBLEM !?

    qDebug() << ui->Graph->currentIndex();


    tabCounter += 1;

    QVBoxLayout *vBoxLayout = new QVBoxLayout();
    vBoxLayout->setAlignment(Qt::AlignTop);
    QWidget *allNodesWidget = new QWidget();
    allNodesWidget->setLayout(vBoxLayout);
    //ui->allNodes_scrollArea->setWidget( allNodesWidgets[ui->Graph->currentIndex()] );     // !? PROBLEM !?
    allNodesWidgets.append(allNodesWidget);

The two lines where I commented !? PROBLEM !? are the two lines. If I uncomment one of these, the program crashes with the Index error. (UPDATE: the second one is because ui->Graph->currentIndex() is -1)
I have really no Idea what this means...
Help please!

[Vinod Kuntoji]

@Niagarer ,

What is the initial value of tabCounter? What is the vector size?

[VRonin]

This post is deleted!

[VRonin]

allNodesWidgets[ui->Graph->currentIndex()]

ui->Graph->currentIndex() is almost certainly out of bounds

[Niagarer]

@VRonin
Oh, yes you are right, thanks.
But it unfortunately does not solve teh actual problem :/

[Niagarer]

@Vinod-Kuntoji
The initial value of TabCounter is 0.
The vector has no specific size, it gets bigger when I add new items... what exactely do you mean?

[Paul Busovikov]

@Niagarer when you add new tab it do not mean that current index will be changed

[Niagarer]

@Paul-Busovikov
Yes...?
To get sure I wrote

    qDebug() << ui->Graph->currentIndex();

before and after adding a new tab

[Niagarer]

To make it easier:
the line

    ui->Graph->addTab(new QWidget(this), "hello");

does not work. Doesn't matter where I call it.

[mrjj]

@Niagarer
a QWidget is not really visible. (it paints nothing)
Try with other type

[Niagarer]

@mrjj
Ok.
This also does not work:

    GraphWidget *newGraphWidget = new GraphWidget(this); //GraphWidget is a QGraphicsView
    ui->Graph->addTab(newGraphWidget, "hello");