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Parentheses expected, but code has sets of parentheses

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  • M micha_eleric

    error:

    QObject::connect: Parentheses expected, slot QMainWindow::CGUI::Btn_test_clicked in ../GUI/CGUI.cpp:2518
    QObject::connect:  (sender name:   'pushButton_22')
    QObject::connect:  (receiver name: 'MainWindow')
    Press <RETURN> to close this window...
    

    code at line 2518:

    ui->pushButton_22->connect(ui->pushButton_22, SIGNAL (clicked()),this, SLOT (CGUI::Btn_test_clicked) );
    

    is it complaining about somewhere else?

    JKSHJ Offline
    JKSHJ Offline
    JKSH
    Moderators
    wrote on last edited by
    #2

    @micha_eleric CGUI::Btn_test_clicked needs parentheses.

    But anyway, the new syntax is more recommended nowadays: https://doc.qt.io/qt-5/signalsandslots-syntaxes.html

    Qt Doc Search for browsers: forum.qt.io/topic/35616/web-browser-extension-for-improved-doc-searches

    M 1 Reply Last reply
    3
    • JKSHJ JKSH

      @micha_eleric CGUI::Btn_test_clicked needs parentheses.

      But anyway, the new syntax is more recommended nowadays: https://doc.qt.io/qt-5/signalsandslots-syntaxes.html

      M Offline
      M Offline
      micha_eleric
      wrote on last edited by
      #3

      @JKSH said in Parentheses expected, but code has sets of parentheses:

      parentheses

      ????
      looks like it has parentheses

      JKSHJ 1 Reply Last reply
      0
      • Kent-DorfmanK Offline
        Kent-DorfmanK Offline
        Kent-Dorfman
        wrote on last edited by Kent-Dorfman
        #4

        SIGNAL and SLOT are macros. you should not put a space before their opening paren.

        M 1 Reply Last reply
        1
        • Kent-DorfmanK Kent-Dorfman

          SIGNAL and SLOT are macros. you should not put a space before their opening paren.

          M Offline
          M Offline
          micha_eleric
          wrote on last edited by
          #5

          @Kent-Dorfman said in Parentheses expected, but code has sets of parentheses:

          SIGNAL and SLOT are macros. you should not put a space before their opening paren.

          i removed spaces, and same errors

          Kent-DorfmanK 1 Reply Last reply
          0
          • M micha_eleric

            @Kent-Dorfman said in Parentheses expected, but code has sets of parentheses:

            SIGNAL and SLOT are macros. you should not put a space before their opening paren.

            i removed spaces, and same errors

            Kent-DorfmanK Offline
            Kent-DorfmanK Offline
            Kent-Dorfman
            wrote on last edited by
            #6

            @micha_eleric See @JKSH response above.

            M 1 Reply Last reply
            0
            • Kent-DorfmanK Kent-Dorfman

              @micha_eleric See @JKSH response above.

              M Offline
              M Offline
              micha_eleric
              wrote on last edited by
              #7

              @Kent-Dorfman said in Parentheses expected, but code has sets of parentheses:

              @micha_eleric See @JKSH response above.

              i did, and i responded.

              1 Reply Last reply
              0
              • M micha_eleric

                @JKSH said in Parentheses expected, but code has sets of parentheses:

                parentheses

                ????
                looks like it has parentheses

                JKSHJ Offline
                JKSHJ Offline
                JKSH
                Moderators
                wrote on last edited by
                #8

                @micha_eleric said in Parentheses expected, but code has sets of parentheses:

                ????
                looks like it has parentheses

                • clicked() <-- has parentheses
                • CGUI::Btn_test_clicked <-- doesn't have parentheses

                And did you read the link I gave you?

                Qt Doc Search for browsers: forum.qt.io/topic/35616/web-browser-extension-for-improved-doc-searches

                M 1 Reply Last reply
                0
                • JKSHJ JKSH

                  @micha_eleric said in Parentheses expected, but code has sets of parentheses:

                  ????
                  looks like it has parentheses

                  • clicked() <-- has parentheses
                  • CGUI::Btn_test_clicked <-- doesn't have parentheses

                  And did you read the link I gave you?

                  M Offline
                  M Offline
                  micha_eleric
                  wrote on last edited by
                  #9

                  @JKSH said in Parentheses expected, but code has sets of parentheses:

                  @micha_eleric said in Parentheses expected, but code has sets of parentheses:

                  ????
                  looks like it has parentheses

                  • clicked() <-- has parentheses
                  • CGUI::Btn_test_clicked <-- doesn't have parentheses

                  And did you read the link I gave you?

                  thank you for the explanation.
                  and yes, i am reading the link you posted. got questions, trying to figure it out.

                  JKSHJ 1 Reply Last reply
                  0
                  • M micha_eleric

                    error:

                    QObject::connect: Parentheses expected, slot QMainWindow::CGUI::Btn_test_clicked in ../GUI/CGUI.cpp:2518
                    QObject::connect:  (sender name:   'pushButton_22')
                    QObject::connect:  (receiver name: 'MainWindow')
                    Press <RETURN> to close this window...
                    

                    code at line 2518:

                    ui->pushButton_22->connect(ui->pushButton_22, SIGNAL (clicked()),this, SLOT (CGUI::Btn_test_clicked) );
                    

                    is it complaining about somewhere else?

                    JonBJ Offline
                    JonBJ Offline
                    JonB
                    wrote on last edited by
                    #10

                    @micha_eleric
                    Your original, old-style should have read like this:

                    ui->pushButton_22->connect(ui->pushButton_22, SIGNAL(clicked()), this, SLOT(CGUI::Btn_test_clicked()) );
                    

                    And the preferable, new-style equivalent would be:

                    ui->pushButton_22->connect(ui->pushButton_22, &QPushButton::clicked, this, &CGUI::Btn_test_clicked);
                    
                    M 1 Reply Last reply
                    4
                    • JonBJ JonB

                      @micha_eleric
                      Your original, old-style should have read like this:

                      ui->pushButton_22->connect(ui->pushButton_22, SIGNAL(clicked()), this, SLOT(CGUI::Btn_test_clicked()) );
                      

                      And the preferable, new-style equivalent would be:

                      ui->pushButton_22->connect(ui->pushButton_22, &QPushButton::clicked, this, &CGUI::Btn_test_clicked);
                      
                      M Offline
                      M Offline
                      micha_eleric
                      wrote on last edited by micha_eleric
                      #11

                      @JonB

                      thank you. i was about half way there

                      1 Reply Last reply
                      0
                      • M micha_eleric

                        @JKSH said in Parentheses expected, but code has sets of parentheses:

                        @micha_eleric said in Parentheses expected, but code has sets of parentheses:

                        ????
                        looks like it has parentheses

                        • clicked() <-- has parentheses
                        • CGUI::Btn_test_clicked <-- doesn't have parentheses

                        And did you read the link I gave you?

                        thank you for the explanation.
                        and yes, i am reading the link you posted. got questions, trying to figure it out.

                        JKSHJ Offline
                        JKSHJ Offline
                        JKSH
                        Moderators
                        wrote on last edited by
                        #12

                        @micha_eleric said in Parentheses expected, but code has sets of parentheses:

                        thank you for the explanation.

                        You're most welcome.

                        and yes, i am reading the link you posted. got questions, trying to figure it out.

                        Feel free to post your questions here.

                        Qt Doc Search for browsers: forum.qt.io/topic/35616/web-browser-extension-for-improved-doc-searches

                        1 Reply Last reply
                        0

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