72

How do I know which version of Qt I am using? When I open Qt Creator it shows "Welcome to Qt Creator 2.3". In the build setting, however, it shows Qt Version 4.7.1.

Marcucciboy2
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user3472783
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8 Answers8

72

qmake-qt5 --version

or

qmake --version

Geremia
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48

Starting with Qt 5.3 you can use:

qtdiag

This prints a bunch of useful information. The first line includes the version:

Qt 5.5.1 (x86_64-little_endian-lp64 shared (dynamic) release build; by GCC 5.3.1 20160407) on "xcb"
David
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23

All the version info is in PyQt5.Qt: 

import inspect
from PyQt5 import Qt

vers = ['%s = %s' % (k,v) for k,v in vars(Qt).items() if k.lower().find('version') >= 0 and not inspect.isbuiltin(v)]
print('\n'.join(sorted(vers)))

prints

PYQT_VERSION = 328193
PYQT_VERSION_STR = 5.2.1
QOpenGLVersionProfile = <class 'PyQt5.QtGui.QOpenGLVersionProfile'>
QT_VERSION = 328192
QT_VERSION_STR = 5.2.0
qVersion = <built-in function qVersion>
qWebKitMajorVersion = <built-in function qWebKitMajorVersion>
qWebKitMinorVersion = <built-in function qWebKitMinorVersion>
qWebKitVersion = <built-in function qWebKitVersion>

The functions can be called too: 

>>> vers = ['%s = %s' % (k,v()) for k,v in vars(Qt).items() if k.lower().find('version') >= 0 and inspect.isbuiltin(v)]
>>> print('\n'.join(sorted(vers)))
qVersion = 5.2.0
qWebKitMajorVersion = 538
qWebKitMinorVersion = 1
qWebKitVersion = 538.1
Neil G
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Oliver
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  • Very useful, thank you for sharing your knowledge. Of the ones you wrote about above I use `print("Qt version: " + str(QtCore.qVersion()))` and `print("PyQt (Python module) version: " + str(Qt.PYQT_VERSION_STR))` – sunyata Jan 26 '17 at 19:56
8

You are using Qt version 4.7.1, because that is the version of the qmake. You can also from shell type qmake -v to get it. The other version, namely 2.3, is the version of Qt Creator, not of Qt

MenzZana
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  • Thanks @menzZana , can you tell me how to upgrade qt 4.7.1 to qt 5.2.1 – user3472783 Apr 14 '14 at 12:05
  • You can install new Qt version at http://qt-project.org/downloads Also you can add the new Qt directly to your Qt Creator, so it uses the new Qt by going to Tools>Options>Build&Run>Qt version and add the new version in Qt Creator – MenzZana Apr 14 '14 at 12:10
  • My operating System is Fedora 16, is it is possible to install Qt5 ? – user3472783 Apr 14 '14 at 12:18
  • Sorry I do not know, since I have never used fedora, but do try to install it. It should work – MenzZana Apr 14 '14 at 12:23
6

my usual starting point to investigate which software is installed is with

dpkg -l | grep "what I am looking for"

you should get a list of installed packages. Then with

dpkg -L "packagename" # (or whatever your package manager is)

you get a list of installed files for that package

Community
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Francesco Casablanca
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4

If you're using Python:

from PyQt5 import QtCore
print(QtCore.qVersion())

If you're using C++:

#include <QtGlobal>
std::cout << qVersion();
Konstantin Burlachenko
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3

For qt4 :

QT_SELECT=4 qmake -v

for qt5 :

QT_SELECT=5 qmake -v

SebMa
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0

You can use qmake -query QT_VERSION:

➜  ~ qmake -query QT_VERSION
4.8.7

➜  ~ Qt/5.15.0/gcc_64/bin/qmake -query QT_VERSION
5.15.0

➜  ~ qt-6.0.0/bin/qmake -query QT_VERSION
6.0.0
mnesarco
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