<![CDATA[GUI app print to console]]>Hello,

I am creating app with GUI (widgets) for Linux. If you run my app it shows GUI (widget), but I want to make my app to be available for console only Linux too (without desktop environment).

So is possible that if someone runs my app through console it will not shows GUI (because you can't) but instead of that I will outputs some text into console?

]]>https://forum.qt.io/topic/91512/gui-app-print-to-consoleRSS for NodeSun, 03 May 2026 21:19:15 GMTSat, 09 Jun 2018 21:50:54 GMT60<![CDATA[Reply to GUI app print to console on Sun, 08 Jul 2018 20:02:00 GMT]]>Hi,

Qt already provides macros for the OS it supports. See here.

]]>https://forum.qt.io/post/468198https://forum.qt.io/post/468198Sun, 08 Jul 2018 20:02:00 GMT<![CDATA[Reply to GUI app print to console on Sun, 08 Jul 2018 18:23:18 GMT]]>@t0msk
hi
Yes, that's the normal way to have different code for
each platform since same calls wont work.
So if you wrap it up in a nice class, and add code for each platform
it will be crossplatform :)

]]>https://forum.qt.io/post/468186https://forum.qt.io/post/468186Sun, 08 Jul 2018 18:23:18 GMT<![CDATA[Reply to GUI app print to console on Sun, 08 Jul 2018 18:28:06 GMT]]>@mrjj I think it could be cross platform, if I added support for Linux, Windows and Mac like:

#ifdef __linux__ 
    //linux code goes here
#elif _WIN32
    //windows code goes here
#else

#endif
]]>https://forum.qt.io/post/468183https://forum.qt.io/post/468183Sun, 08 Jul 2018 18:28:06 GMT<![CDATA[Reply to GUI app print to console on Sun, 08 Jul 2018 17:17:59 GMT]]>@t0msk
hi
ok, well it would be ok fine to do in a Qt app.
but its not crossplatform.

]]>https://forum.qt.io/post/468177https://forum.qt.io/post/468177Sun, 08 Jul 2018 17:17:59 GMT<![CDATA[Reply to GUI app print to console on Sun, 08 Jul 2018 17:12:30 GMT]]>Thank you :) I consider Qt as framework for C++ :) By pure C++ I meant code without Qt classes :)

]]>https://forum.qt.io/post/468175https://forum.qt.io/post/468175Sun, 08 Jul 2018 17:12:30 GMT<![CDATA[Reply to GUI app print to console on Sun, 08 Jul 2018 17:04:55 GMT]]>@t0msk
Hi
Qt is pure c++. :)
But there would not be a Qt class for it.
You would use native windows / linux apis
something like shown here
https://stackoverflow.com/questions/9009333/how-to-check-if-the-program-is-run-from-a-console

]]>https://forum.qt.io/post/468172https://forum.qt.io/post/468172Sun, 08 Jul 2018 17:04:55 GMT<![CDATA[Reply to GUI app print to console on Sun, 08 Jul 2018 16:52:34 GMT]]>Thank you and does have Qt access to some of these API calls? Or it must be done in pure C++?

]]>https://forum.qt.io/post/468170https://forum.qt.io/post/468170Sun, 08 Jul 2018 16:52:34 GMT<![CDATA[Reply to GUI app print to console on Sun, 08 Jul 2018 16:49:10 GMT]]>@t0msk
Well it uses the parameter to know, so it needs some flag in some form or another.
I have not seen other methods, but some could exists involving navtive api calls
to find out if run from a shell or via other means of activation.

]]>https://forum.qt.io/post/468167https://forum.qt.io/post/468167Sun, 08 Jul 2018 16:49:10 GMT<![CDATA[Reply to GUI app print to console on Sun, 08 Jul 2018 16:42:56 GMT]]>Thank you very much, sorry for late reply, just one more question this is only one way?

Or is possible that program will detect if it is run from command line or just by arguments like:

"-no-gui"

?

]]>https://forum.qt.io/post/468166https://forum.qt.io/post/468166Sun, 08 Jul 2018 16:42:56 GMT<![CDATA[Reply to GUI app print to console on Sat, 09 Jun 2018 22:27:37 GMT]]>Hi
yes, its possible.
Doc has sample.
http://doc.qt.io/qt-5/qapplication.html#details
The trick is to use QCoreApplication instead of QApplication and
a parameter telling when to run non gui.

But for this to work as intended, you must design your app
so any data it needs or function do not
live in mainwindow or other widgets.
Then your app can work in both modes.

]]>https://forum.qt.io/post/462857https://forum.qt.io/post/462857Sat, 09 Jun 2018 22:27:37 GMT