How to find Version of Qt?
Qt4PyqtQt CreatorQtcoreQtcpsocketQt4 Problem Overview
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.
Qt4 Solutions
Solution 1 - Qt4
qmake-qt5 --version
or
qmake --version
Solution 2 - Qt4
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"
Solution 3 - Qt4
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
Solution 4 - Qt4
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
Solution 5 - Qt4
For qt4 :
QT_SELECT=4 qmake -v
for qt5 :
QT_SELECT=5 qmake -v
Solution 6 - Qt4
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
Solution 7 - Qt4
If you're using Python:
from PyQt5 import QtCore
print(QtCore.qVersion())
If you're using C++:
#include <QtGlobal>
std::cout << qVersion();
Solution 8 - Qt4
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