[Qt-interest] Adding widget to QGraphicsView

[Srdjan Todorovic]

Hi,

On 22/07/2009, Yuvaraj R <yuvaraj at ongobiz.com> wrote:
> I declared the the Qlabel ,QlineEdit as private in Class..
>
> if use the label apart from the constrcutor application crashing..

> QLabel *label = new QLabel();

This is local to the constructor?
Falls out of scope soon...

> void Widget::show_message1()
>
> {
>
> QMessageBox::information(0,"",QString("yuvaraj"));
>
> label->hide();

BANG!
Class member pointer 'label' is not initialised at this point.

> }

Do you understand the concept of scope?

If yes
{
   fix your code
}

else
   find and read a good C/C++ book

You did not run a debugger to discover that label is not a valid pointer.

Srdjan