QLabel added in Designer, no corresponding object in ui*.h

Dave Colter

Hi, I'm enhancing a program I wrote in Qt last year.

It is a touch screen-based app with a very simple UI hierarchy like this:

MainApp (QMainWindow)
    centralWidget (QWidget)
        label1 (QLabel)
        label2 (QLabel)
        label3 (QLabel)

In ui_mainapp.h, the following was generated:

class Ui_MainApp
{
public:
    QWidget *centralWidget;
    QLabel *label1;
    QLabel *label2;
    QLabel *label3;
// etc.
}

Now, I'd like to add a fourth QLabel. So I drag and drop the label in Qt Designer. It appears in the edit window, I can set its properties and it is shown in the object list with the other three. However, no object is created in the ui_mainapp.h file. Consequently, I have nothing to reference in my code

Is there something I'm missing?

Thanks in advance.

Dave

Pl45m4

@Dave-Colter said in QLabel added in Designer, no corresponding object in ui*.h:

I tried commenting one of the QLabel declarations in ui_mainapp.h and rebuilt

You dont have to edit the ui_xxxx.h at all. It's generated by qmake from your Qt Designer file (*.ui).
So yes, you can delete it.

Try:
Close your project and Qt Creator / Designer and re-open it again. Sometimes there are cached or autosaved files, so qmake doesnt see any changes.

Pl45m4

@Dave-Colter

Clean up your project, then run qmake / build and compile again.

Dave Colter

@Pl45m4

Thanks for the reply. Tried that to no avail. I get the message

make: Nothing to be done for 'qmake_all'.

Now you say "clean up your project". I did a Clean All from the build menu; is there anything else I can do? I tried commenting one of the QLabel declarations in ui_mainapp.h and rebuilt. I got the compile errors you might expect, so the file is not being regenerated, even on a Clean All/Rebuild All. Can the file be safely deleted to force regeneration?

Pl45m4

@Dave-Colter said in QLabel added in Designer, no corresponding object in ui*.h:

I tried commenting one of the QLabel declarations in ui_mainapp.h and rebuilt

You dont have to edit the ui_xxxx.h at all. It's generated by qmake from your Qt Designer file (*.ui).
So yes, you can delete it.

Try:
Close your project and Qt Creator / Designer and re-open it again. Sometimes there are cached or autosaved files, so qmake doesnt see any changes.

CP71

@Dave-Colter
Hi,
Try to remove build directory from file manager, sometimes I saw that clear all isn't useful to remove this issue,

Dave Colter

@Pl45m4

OK -- I deleted all the ui_.h files, all the moc_.cpp files and the debug folder. Then I did a Clean All/qmake/Rebuild All.

It works!! Thank you!!

The only odd thing is that now the generated files are saved only in my debug folder. I used to have copies in my main project folder. However, when I initially created this app last year, I was learning Qt from scratch. I guess it was something I did back then that left the copies in my main folder.

Thanks again!

Dave

Dave Colter

@CP71

Hi, just seeing your reply now as I've been banging away on my project. Deleting the build (debug) folder was indeed part of the solution. Thanks for your reply.