No such file or directory #include <QtWidgets>

Xander84

you have to include the Qt classes you need, for a simple program like this you can include the whole module but I would not recommend that because it will drastically increase compile time.
@
#include <QApplication>
#include <QWidget>
#include <QPushButton>
@
essentially you have to include all Qt classes like this, if you want to do it right. :)

if you are lazy or have a super fast computer you can include whole Qt modules at once with
@
#include <QtCore>
#include <QtGui>
#include <QtWidgets>
...
@
i would only use that if you need many classes from one module.

tymop

Thank you,
with your help, I managed to run the example.

I find it unfortunate that the examples do not work as they are.
That make the learning more difficult.

clochydd

Usually, the examples work as they are.
I have opened your examples/widgets/tutorials/addressbook/part1 with the Qt Creator, built it and had no errors.
How did you work with the example?

tymop

That is strange, because, as I said, I just install qtcreator with the script qt-opensource-linux-x64-1.5.0-2-online.run, in the /opt directory/

Then, I open it and tried some examples, and I have the same problem eact time.

Xander84

Do you open the examples from Qt creator directly? (Welcome -> examples)
they should work out of the box.

And is there a reason you use and old version of Qt? I mean that is like 2 years old or something. :)

tymop

Do you open the examples from Qt creator directly? No : I opened with open file or project

And is there a reason you use and old version of Qt? I used the version found on the site web qt-opensource-linux-x64-1.5.0-2-online.run

I tried another version comming from the ubuntu deposite(Qt Creator 3.0.1) , but there was another problem because the binary /usr/bin/qmlpuppet was not installed (because not in the ubuntu deposite), and I did not find he way to install it.

Xander84

I have Qt 5.2.1 running on my Ubuntu machine, using the online installer (qt-linux-opensource-1.5.0-x64-online.run in my case), worked like a charm so I don't know what you did. You have so weird bugs, I have no idea why, sorry.

clochydd

I think we should try to find out, what happend to your install.
If you look at your Creator's About screen, do you see this:
Qt Creator 3.1.0 (opensource)
Based on Qt 5.2.1 (GCC 4.6.1, 64 bit)
Try to compare your Creator settings with "this: ":http://qt-project.org/doc/qtcreator-3.1/creator-configuring.html

tymop

Thank form your help.
This is the version installed
@Qt Creator 3.0.1
Based on Qt 5.2.1 (GCC 4.8.2, 64 bit)
Built on Apr 9 2014 at 09:12:59
@

And the version from the .run
@Qt Creator 3.1.0 (opensource)
Basé sur Qt 5.2.1 (GCC 4.6.1, 64 bit)
Compilé le Apr 14 2014 à 15:03:42
Depuis la révision 52592aa879@

But it is strange because, now, the qtcreator installed from the unbuntu deposites is now working. Maybe the .run install added the missing files ?

clochydd

As the Qt Creator 3.1.0 is the newest version it would be better to use it instead of 3.0.1 - but if you succeed with 3.0.1 you shouldn't have problems.
Perhaps you may give 5.3.0 a try when it's released in a few days.

AlexeiK

@tymop
Провести настройку комплектов под Qt5
На вкладке Проекты провести настройку проекта заново с верными компеляторами