QCommandLineParser print data to dos window

[gong]

Hello everyone,

I am the beginner of Qt development, my Qt version is 6.6.3.I try to make my application to run batch.
The QCommandLineParser work well but cannot print any data to dos window. My code as below: qDebug print nothing but QMessageBox show normally. And the version, help command(-v , -h )will show the data in new window, not in dos window.

Is there any advice to show the data in dos window? Thank a lot!

[Bonnie]

Is your application supposed to be a console application or a gui application?

[gong]

@Bonnie thanks for your reply, it is the gui application.

[jsulm]

@gong In future please post code as text, not pictures.
Do you start your application from a terminal (cmd.exe) or from QtCreator?
You can also set "Run in terminal" checkbox in Run settings of your project in "Build & Run" in QtCreator.

[Bonnie]

@gong gui application doesn't have console output by default on windows.
Try add win32:CONFIG += console in your .pro file.
If you uses cmake, I've searched what's the equivalent, seems if you create a gui project by qt creator wizard, WIN32_EXECUTABLE TRUE is set in set_target_properties automatically and it should be removed to have console feature.

[gong]

@Bonnie @jsulm Thank you very much for the help! The issue is solved.
After adding "CONFIG+=console", start application from cmd, qDebug will print in the dos window. But it print so many now, is it possilbe to control, for example, print qInfo only and ignore the others, I just want to show the key results(one or several line) in dos window.

[Christian Ehrlicher]

See https://doc.qt.io/qt-6/qtlogging.html#qInstallMessageHandler on how to filter and format the debug output.

[Bonnie]

@gong One simple but not so ideal solution is adding DEFINES_RELEASE += QT_NO_DEBUG_OUTPUT in the .pro file.
Then qDebug() will only print in the debug version, not the release one.

[gong]

Thanks a lot! I use the "qInstallMessageHandler" to solve the issue and show the printed result in dos window. I think the topic is finished perfectlly and thank you for the help, BTW how to set the topic as solved?