How to alocate a double pointer to QPushbutton

Adrian.Aioanei

Hey guys,

I need to create a number of buttons from user input. So i have a class with a member

QPushButton** buttons;

And then i have a function

void networkDivide::generateLabelForNetwork(int value)
{
    networkDivide::numberOfWidgets = value;
    QHBoxLayout* layout = new QHBoxLayout();
    *buttons= new QPushButton[value]();
    for(int i=0;i<value;i++)
    {
        buttons[i] = new QPushButton("Butt");
        layout->addWidget(buttons[i]);
    }
    m_networkGroup->setLayout(layout);
}

Dosen't give any error but it fails when alocate memory.
How should I allocate a double pointer of QPushButton type?

raven-worx

@Adrian.Aioanei
most easiest would be to store the pointers in one of Qt's container classes, like QList for example.
Unless you are dependent on a pointer-to-pointer list?

Adrian.Aioanei

I am not dependent of this. All i try to do is to create a number of buttons after a user input.
I have a label how takes that value and after this, i create a number of buttons.
How does QList help me in this case? :)

J.Hilk

@Adrian.Aioanei
e.g:

QList<QPushButton *> btnList;

for(int i = 0; i < 10; i++){
    QPushButton *btn = new QPushButton();
    QString text = QString::number(i);
    btn->setText(text);
    btn->setObjectName("MyButton"+text);
   .....
   
    btnList.append(btn);
}

Adrian.Aioanei

This looks ok I will try it.
One more question...the button is created in for loop. This pointer will not be deleted after the function reach "}" ?

Vinod Kuntoji

@Adrian-Aioanei
QPushButton **buttons;

void networkDivide::generateLabelForNetwork(int value)
{
networkDivide::numberOfWidgets = value;
QHBoxLayout* layout = new QHBoxLayout();
buttons= new QPushButton *[value];
for(int i = 0; i < value; i++) {
buttons[i] = NULL;
}
for(int i=0;i<value;i++)
{
buttons[i] = new QPushButton("Butt");
layout->addWidget(buttons[i]);
}
m_networkGroup->setLayout(layout);
}