Problem With findchild()

Hi i am trying to use the findChlid(), and i was getting error after running it that is
The program has unexpectedly finished

Here is my Code:
The Header File

Code:

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class menuprocess : public QWidget
{
	Q_OBJECT
public:
	menuprocess();
	~menuprocess();
private:
QLabel *io_one;
private slots:
int tester();
};

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The CPP File

Code:

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menuprocess::menuprocess()
{
io_one = new QLabel(this);
testButton = new QPushButton(this);
    testButton->setText("Test");
    testButton->setGeometry(250,130,40,30);
}
 
int menuprocess::tester()
{
QStringList ios;
    ios << "RFID" << "MagSwipe" << "RTC" << "IFD" <<"PM";
QStringList obs;
    obs << "io_one" << "io_two" << "io_three" << "io_four";
        QLabel *label = parentWidget()->findChild<QLabel *>(obs.at(j));[B]I have used both the Lines this one and the next one by commenting one among this[/B]
        QLabel *label = this->findChild<QLabel *>(obs.at(j));
        qDebug()<<"The OBJECT NAME is"<<label->objectName();//at this line i am getting error[B]The program has unexpectedly finished[/B]
label->setText(ios.at(i));[B]//And here too the same error if i comment the QDebug Line[/B]
}

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Is it possible todo so in this manner if yes

Please do need ful

Thanks in advance

Regards,
Rohith.G

Hi, findChild() uses the object name of a QObject, not the name of the variable where you store your pointer. So I guess in your case "label" is always NULL, and that's why the program crashes. Use setObjectName() when you create your label in the menuprocess-constructor.

Ginsengelf

Quote:

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Originally Posted by gunturrohith

The program has unexpectedly finished

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Meaning it crashed.
You should have gotten a stack trace when running this in a debugger.

Quote:

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Originally Posted by gunturrohith

Here is my Code:

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Don't write that when the code is not actually your code.

Quote:

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Originally Posted by gunturrohith

Is it possible todo so in this manner if yes

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Yes, this is possible, as Ginsengelf already wrote.

However, what do you need this for?
Why not just store the widgets you need access to in a way to allows you to access them directly?

Cheers,
_

Quote:

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Don't write that when the code is not actually your code.

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Hi anda_soka,

Thanks for replying and helping and apologies for asking explanation,may i know the reason behind for stating this sentence
Don't write that when the code is not actually your code. I may not be a great programmer in Qt but all the lines i have written on my own by considering the Qt assistant as reference.

Thanks in advance,
Rohith.G

Hi, anda_skoa probably meant that your code won't compile the way you posted it and this means that it is not your complete code. For example i and j are undeclared in menuprocess::tester()

Ginsengelf

Quote:

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Originally Posted by Ginsengelf

Hi, anda_skoa probably meant that your code won't compile the way you posted it and this means that it is not your complete code.

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Exactly!

Cheers,
_