How to get rid of changed code lingering in the moc?

[landslyde]

In my main menu, I had an action set up and its accompanying code. Then I decided to change the action name on the menu to something else. I did that and took the code from the first, no-longer-needed action and gave it to the new action. Now I get this each time I run it:

QMetaObject::connectSlotsByName: No matching signal for on_actionA_lter_triggered()

I've tried to "Clean" the build, thinking that would cure the moc's ailment, but no dice. So what can I do to fix this? This is the ONE thing about Qt that drives me crazy.

[aha_1980]

hi @landslyde

you most likely still have the slot function in you code, but the signal no longer exists.

that's what the connect error message is going to tell you.

[landslyde]

I've tried taking it out. That only throws an error in the moc. I'll post this.

Code commented out:

//void MainWindow::on_actionA_lter_triggered()
//{

//}

Error thrown in the moc:

/home/slyde/Desktop/Qt/build-Qt_Stacked_Widget-Desktop_Qt_5_11_0_GCC_64bit-Debug/moc_mainwindow.cpp:100: error: undefined reference to `MainWindow::on_actionA_lter_triggered()'

The error code:

void MainWindow::qt_static_metacall(QObject *_o, QMetaObject::Call _c, int _id, void **_a)
{
    if (_c == QMetaObject::InvokeMetaMethod) {
        MainWindow *_t = static_cast<MainWindow *>(_o);
        Q_UNUSED(_t)
        switch (_id) {
        case 0: _t->on_actionE_xit_triggered(); break;
        case 1: _t->on_actionA_lter_triggered(); break;  // throws error here
        case 2: _t->on_action_Add_triggered(); break;
        case 3: _t->on_action_Delete_triggered(); break;
        case 4: _t->on_action_View_triggered(); break;
        case 5: _t->on_action_Search_triggered(); break;
        case 6: _t->on_btnCancel_add_recipe_clicked(); break;
        case 7: _t->on_action_Edit_triggered(); break;
        default: ;
        }
    }
    Q_UNUSED(_a);
}

I can comment out that line "case 1:" and I go back to getting a warning. There has to be a way for this to be cleaned out of the code. I know I'm not the first person that's ever changed his mind on the name of something.

[landslyde]

Fixed it. Thank you, aha_1980.

[aha_1980]

Hi @landslyde,

glad you figured it out.

Running Qmake most often helps, in very rare cases you need to delete your build folder to get the error away.

[landslyde]

Actually, while I'd deleted the action code from mainwindow.cpp, I hadn't deleted its prototype in mainwindow.h. That's what the compiler was complaining about. So I deleted it in the .h and then ran Build -> Clean All. Doing that removed the reference to the deleted action in the moc file. Problem solved. Thanks again for your help.