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How to call an object created in another function.

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c++function
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  • ronyNSR Offline
    ronyNSR Offline
    ronyNS
    wrote on last edited by
    #5

    Yes i am aware of that , but this is the problem https://forum.qt.io/topic/69999/how-to-add-a-label-on-a-layout-that-covers-the-entire-window/2
    This is the reason i am using resizeEvent.

    mrjjM 1 Reply Last reply
    0
    • ronyNSR ronyNS

      Yes i am aware of that , but this is the problem https://forum.qt.io/topic/69999/how-to-add-a-label-on-a-layout-that-covers-the-entire-window/2
      This is the reason i am using resizeEvent.

      mrjjM Offline
      mrjjM Offline
      mrjj
      Lifetime Qt Champion
      wrote on last edited by
      #6

      @ronyNS
      ok :)
      Still not sure why layout wont work but resize event will then.
      You just want qLabel to cover all mainwindow ?

      1 Reply Last reply
      2
      • ronyNSR Offline
        ronyNSR Offline
        ronyNS
        wrote on last edited by
        #7

        Yes , like i want to cover my login form , but when i drag the label on the ui it resizes according to the layout.
        I used size policy , but when i run it , the main window size is fixed and cannot be reduced.
        If there is an easy way , please tell me :)

        mrjjM 1 Reply Last reply
        0
        • ronyNSR ronyNS

          Yes , like i want to cover my login form , but when i drag the label on the ui it resizes according to the layout.
          I used size policy , but when i run it , the main window size is fixed and cannot be reduced.
          If there is an easy way , please tell me :)

          mrjjM Offline
          mrjjM Offline
          mrjj
          Lifetime Qt Champion
          wrote on last edited by
          #8

          @ronyNS
          ok, sounds like i dont understand the full setup then.
          Maybe resize event will just be easier :)

          1 Reply Last reply
          2
          • ronyNSR Offline
            ronyNSR Offline
            ronyNS
            wrote on last edited by
            #9

            Yes , Thank you ! :)

            1 Reply Last reply
            1
            • ronyNSR Offline
              ronyNSR Offline
              ronyNS
              wrote on last edited by
              #10

              Hey now i am getting 'Expected specifier before Qlabel' error . Please help

              mrjjM 1 Reply Last reply
              0
              • ronyNSR ronyNS

                Hey now i am getting 'Expected specifier before Qlabel' error . Please help

                mrjjM Offline
                mrjjM Offline
                mrjj
                Lifetime Qt Champion
                wrote on last edited by mrjj
                #11

                @ronyNS said:

                Expected

                show line where it says it :)

                did u include <QLabel>
                in mainwindow. h?

                if its for the line
                QLabel *lbl1;

                1 Reply Last reply
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                • ronyNSR Offline
                  ronyNSR Offline
                  ronyNS
                  wrote on last edited by
                  #12
                  void createlbl(){
                  lbl1 = new QLabel("Hello");
                  }
                  

                  Error is for this line only when i use lbl1 in other functions. Yes i have included Qlabel in .h file

                  mrjjM 1 Reply Last reply
                  0
                  • ronyNSR ronyNS
                    void createlbl(){
                    lbl1 = new QLabel("Hello");
                    }
                    

                    Error is for this line only when i use lbl1 in other functions. Yes i have included Qlabel in .h file

                    mrjjM Offline
                    mrjjM Offline
                    mrjj
                    Lifetime Qt Champion
                    wrote on last edited by mrjj
                    #13

                    @ronyNS
                    well u are not in mainwindow method..

                    void XXXX::createlbl(){

                    XXXX should be mainwindow

                    when there is no NAME:: in front, its NOT a member function. just a plain function.

                    ronyNSR 1 Reply Last reply
                    0
                    • mrjjM mrjj

                      @ronyNS
                      well u are not in mainwindow method..

                      void XXXX::createlbl(){

                      XXXX should be mainwindow

                      when there is no NAME:: in front, its NOT a member function. just a plain function.

                      ronyNSR Offline
                      ronyNSR Offline
                      ronyNS
                      wrote on last edited by
                      #14

                      @mrjj
                      Still the same error

                      void MainWindow:: createlbl(){
                          lbl1 = new Qlabel();
                      }
                      

                      'expected type-specifier before QLabel

                      mrjjM 1 Reply Last reply
                      0
                      • ronyNSR ronyNS

                        @mrjj
                        Still the same error

                        void MainWindow:: createlbl(){
                            lbl1 = new Qlabel();
                        }
                        

                        'expected type-specifier before QLabel

                        mrjjM Offline
                        mrjjM Offline
                        mrjj
                        Lifetime Qt Champion
                        wrote on last edited by mrjj
                        #15

                        but it should work. ?

                        show mainwindow.h

                        here is sample that does so
                        https://www.dropbox.com/s/i0qj2e9mxbggymt/mylabel.zip?dl=0

                        1 Reply Last reply
                        2
                        • ronyNSR Offline
                          ronyNSR Offline
                          ronyNS
                          wrote on last edited by
                          #16

                          my mainwindow.h

                          #ifndef MAINWINDOW_H
                          #define MAINWINDOW_H
                          #include<QLabel>
                          #include <QMainWindow>
                          
                          namespace Ui {
                          class MainWindow;
                          }
                          
                          class MainWindow : public QMainWindow
                          {
                              Q_OBJECT
                          
                          public:
                              explicit MainWindow(QWidget *parent = 0);
                              ~MainWindow();
                              QLabel *lbl;
                          
                          protected:
                              void resizeEvent(QResizeEvent *evt) override;
                          
                          private:
                              Ui::MainWindow *ui;
                          };
                          
                          #endif // MAINWINDOW_H
                          

                          my mainwindow.cpp

                          #include "mainwindow.h"
                          #include "ui_mainwindow.h"
                          #include<QLabel>
                          
                          MainWindow::MainWindow(QWidget *parent) :
                              QMainWindow(parent),
                              ui(new Ui::MainWindow)
                          {
                              ui->setupUi(this);
                          }
                          
                          void MainWindow:: createlbl(){
                              lbl = new Qlabel();
                          }
                          
                          void MainWindow :: resizeEvent(QResizeEvent *evt)
                          {
                              MainWindow::setCentralWidget(lbl);
                              lbl->setStyleSheet("Background-color:pink");
                          
                              QMainWindow::resizeEvent(evt); //call base implementation
                          }
                          
                          MainWindow::~MainWindow()
                          {
                              delete ui;
                          }
                          
                          
                          
                          1 Reply Last reply
                          0
                          • mrjjM Offline
                            mrjjM Offline
                            mrjj
                            Lifetime Qt Champion
                            wrote on last edited by
                            #17

                            @ronyNS said:

                            lbl = new Qlabel();

                            misspelled ?
                            its QLabel ?

                            lbl = new QLabel();
                            big L ?

                            1 Reply Last reply
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