Qt - setText() crahses program

Question

I'm trying to get some text input for the user for further use. For this, I used a QInputDialog:

bool ok;
QString text = QInputDialog::getText(this, tr("QInputDialog::getText()"),
                                     tr("Your input:"), QLineEdit::Normal,
                                     QDir::home().dirName(), &ok);
if (ok && !text.isEmpty()) {
    textLabel->setText(text);
}

This crahses my program at the line textLabel->setText(text);. If I comment it out, it does not crash, but the text variable stays empty. What am I missing? Thank you!

I defined it in the .h file as `QLabel* textLabel;` and is not used before. I guess it is. Should it be? — lte__, May 02 '16 at 12:38
Something like "textLabel= new QLabel('some text');" or pass the reference to an existing QLabel. — Lucas Araujo, May 02 '16 at 12:42
Oh, stupid me! That was it. Now it does not crash. Thank you! — lte__, May 02 '16 at 12:45
Great, may I post it as an answer and you accept it? if you belive that it was the right one. — Lucas Araujo, May 02 '16 at 12:48

score 1 · Accepted Answer · answered May 02 '16 at 12:57

1

First, you should initialize textLabel or give it a reference to an existing QLabel.

You can initialize it like this:

textLabel= new QLabel('some text');

Also, see QLabel documentation for more information on QLabel constructors.

answered May 02 '16 at 12:57

Lucas Araujo

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Qt - setText() crahses program

1 Answers1