Qt error: `qApp' was not declared in this scope

Question

As I know qApp is global pointer so it should be accessible anywhere but I am getting this error error: qApp was not declared in this scope.

  1 #include "textEdit.h"
  2
  3 TextEdit::TextEdit() {
  4 }
  5
  6 void TextEdit::insertFromMimeData (const QMimeData * source) {
  7     if (qApp->mouseButtons() == Qt::MidButton) {
  8         return;
  9     }
 10     QTextEdit::insertFromMimeData(source);
 11 }
 12
 13

#include<QApplication> qt-project.org/doc/qt-5.0/qtwidgets/qapplication.html#qApp — Marek R
– Marek R, Commented Jul 23, 2013 at 15:44

Muckle_ewe · Accepted Answer · 2016-11-25 10:43:31Z

18

You need to use

#include <QApplication>

to use the qApp macro. See documentation at http://doc.qt.io/qt-5/qapplication.html#qApp

edited Nov 25, 2016 at 10:43

answered Jul 23, 2013 at 15:43

Muckle_ewe

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Johny · Accepted Answer · 2013-07-23 15:43:15Z

6

You probably forgot to include header with the declaration.

 #include <QApplication>

answered Jul 23, 2013 at 15:43

Johny

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sh03 · Accepted Answer · 2013-07-23 15:53:42Z

3

qApp is declared in qapplication.h file. Include it.

edited Jul 23, 2013 at 15:53

sh03

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answered Jul 23, 2013 at 15:43

RadhaKrishna

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