I'm developing a GUI application based on widget in Ubuntu. I would like to print some debug information to console with printf. Is it possible to show console window while debugging application in Qt?
-
If you use Qtcreator this should be standard when you run it in debug mode.Clearer– Clearer2018-04-03 13:26:43 +00:00Commented Apr 3, 2018 at 13:26
Add a comment
|
2 Answers
Sure. Just run your application in the debugger from a terminal (like gdb myapp) or instruct your IDE (whatever it is) to run the program in a terminal - both qtcreator, visual studio and others support this.
2 Comments
vico
How to tell QT to run application in terminal?
Jesper Juhl
@vico Qt or no Qt is irrelevant. step 1) open a terminal window. step 2) navigate to the directory with your application. step) run your application from the terminal window.
Yes, that's easily possible. Since you're working with a Qt Application, I would utilize the Qt debugging module; QDebug. To have the console appear on a GUI application you need to edit the CONFIG parameter in the *.pro file like below:
CONFIG += console
This will force any Qt Application to also spawn a console along side it, even if started with a desktop shortcut. Finally, instead of using printf(..), I would use qDebug(). It's built into Qt and simplistic to use. In the files you would like to use qDebug, just add:
#include <QDebug>
When you would like to output a message to the console just write:
qDebug() << "This will output to the spawned console!";
or,
qDebug() << QString("This will output to the spawned console!");
Finally, using the qDebug method allow's you to provide classes with debug operators like below:
class MyClass {
public:
MyClass(..);
QDebug operator<< (QDebug d, const MyClass &myclass) {
d << "This is what I want to output to the console!";
return d;
}
This will allow you to make cleaner code than using fprint(..) throughout your project, hope it helps!
