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  • S Offline
    S Offline
    situ117
    wrote on last edited by
    #5

    Check this signal:

    http://doc.qt.nokia.com/4.7/qlcdnumber.html#overflow

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    • G Offline
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      goetz
      wrote on last edited by
      #6

      [quote author="Revu" date="1298007867"]I got it done with the QtCreator.
      I used the following code to validate my lineEdit to accept only numbers.

      QRegExp rx( "^[0-9]*$" );
      QValidator *validator = new QRegExpValidator(rx, this);
      lineEdit->setValidator( validator );

      Thank You[/quote]

      You could also use "QSpinBox":http://doc.qt.nokia.com/4.7/qspinbox.html instead of a line editor or use a ready built "QIntValidator":http://doc.qt.nokia.com/4.7/qintvalidator.html on your line edit.

      http://www.catb.org/~esr/faqs/smart-questions.html

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      • P Offline
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        prajnaranjan.das
        wrote on last edited by
        #7

        Go through this link...This may be helpful to you..

        http://doc.qt.nokia.com/4.7/tutorials-addressbook.html

        Prajnaranjan Das

        e mail: prajnaranjan.das@gmail.com

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        • R Offline
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          Revu
          wrote on last edited by
          #8

          @All thank you

          Every fall is to raise higher than Before.

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          • R Offline
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            Revu
            wrote on last edited by
            #9

            Now I have a new problem.

            I have two forms in QtCreator.How do I link both?
            A click of a button on the main window should display the other window.
            Can I do this by saving both the forms into the same folder and then create a slot in the mainwindow?

            Please help me...
            Reply at the earliest will help me a lot.

            Thanks in advance

            Every fall is to raise higher than Before.

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            • G Offline
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              giesbert
              wrote on last edited by
              #10

              First: for new questions, a new thread would be fine, so the topics are separated.

              Regarding your problem: You have a class that implements your form. In this class you have the slots for the buttons. There you can show the other form, same as showing dialogs etc.

              Nokia Certified Qt Specialist.
              Programming Is Like Sex: One mistake and you have to support it for the rest of your life. (Michael Sinz)

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              • R Offline
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                Revu
                wrote on last edited by
                #11

                @Geroif:ok sorry for that...

                I thought this is concerned with slot so i could post here..

                Well still am not clear about the solution.It would be better if it is in steps.

                Thank you

                Every fall is to raise higher than Before.

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                • G Offline
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                  giesbert
                  wrote on last edited by
                  #12

                  The normal way of using designer created forms is:

                  create them in designer

                  in your project, create a class that uses the QtDesigner created ui stuff to build it's UI and implement the logic in the class

                  in this class you implement the slots, so you can also implement a slot for a button (see the docs, bock, examples...)

                  in that slot you can show your second form. (MyDesignerClass2.show() ) where MyDesignerClass2 is the class you use for implementing the UI for the second form. It can't be done directly in QtDesigner.

                  Nokia Certified Qt Specialist.
                  Programming Is Like Sex: One mistake and you have to support it for the rest of your life. (Michael Sinz)

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                  • R Offline
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                    Revu
                    wrote on last edited by
                    #13

                    @Geroif:I will try out with it .
                    Thank You

                    Every fall is to raise higher than Before.

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                    • R Offline
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                      Revu
                      wrote on last edited by
                      #14

                      @Geroif:I think almost is done.But how to declare the second designer form in the scope of first form in its .cpp file.

                      Every fall is to raise higher than Before.

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                      • G Offline
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                        goetz
                        wrote on last edited by
                        #15

                        [quote author="Revu" date="1298372699"]@Geroif:I think almost is done.But how to declare the second designer form in the scope of first form in its .cpp file.[/quote]

                        The usual way is to have one cpp class per form file (.ui). To use one of the forms in another cpp file, include the headers as you do for ordinary classes too.

                        http://www.catb.org/~esr/faqs/smart-questions.html

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                        • R Offline
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                          Revu
                          wrote on last edited by
                          #16

                          @Volker:Thanks for that tip.

                          Should I have a file(.h) for my second form too?

                          Every fall is to raise higher than Before.

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                          • G Offline
                            G Offline
                            goetz
                            wrote on last edited by
                            #17

                            Yes.

                            http://www.catb.org/~esr/faqs/smart-questions.html

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                            • G Offline
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                              giesbert
                              wrote on last edited by
                              #18

                              Of course!

                              Each form should be a class, and a class should have header and cpp (if its not pure inline or template).
                              The designer is only some helper tool to not do all the coding for ui representation by hand (what I personally prefer).

                              Nokia Certified Qt Specialist.
                              Programming Is Like Sex: One mistake and you have to support it for the rest of your life. (Michael Sinz)

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                              • R Offline
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                                Revu
                                wrote on last edited by
                                #19

                                am not able to get it done...how could I attach my code with the message to get help ?

                                Every fall is to raise higher than Before.

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                                • R Offline
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                                  Revu
                                  wrote on last edited by
                                  #20

                                  Am getting error after compiling.The code is as follows:
                                  @#include <QtGui>

                                  #include "mainwindow.h"
                                  #include "subWindow.h"

                                  int main(int argc , char *argv[])
                                  {
                                  QApplication app(argc,argv);

                                      mainwindow mWindow;
                                      mWindow.show();
                                      subWindow window;
                                      window.show();
                                  
                                      QObject::connect( &mWindow, SIGNAL(Clicked()),
                                      &window, SLOT(on_next_clicked()));
                                  
                                      return app.exec();
                                  

                                  }
                                  @

                                  the error is:

                                  main.cpp: In function ‘int main(int, char**)’:
                                  main.cpp:10: error: ‘mainwindow’ was not declared in this scope
                                  main.cpp:10: error: expected ‘;’ before ‘mWindow’
                                  main.cpp:11: error: ‘mWindow’ was not declared in this scope
                                  make: *** [main.o] Error 1

                                  please help

                                  Every fall is to raise higher than Before.

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                                  • A Offline
                                    A Offline
                                    andre
                                    wrote on last edited by
                                    #21

                                    Are you sure this is the whole output? It seems like something is wrong in your mainwindow.h. Please post both the complete compilation output, and the contents of mainwindow.h.

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                                    • G Offline
                                      G Offline
                                      goetz
                                      wrote on last edited by
                                      #22

                                      [quote author="Revu" date="1298453513"]
                                      main.cpp: In function ‘int main(int, char**)’:
                                      main.cpp:10: error: ‘mainwindow’ was not declared in this scope
                                      main.cpp:10: error: expected ‘;’ before ‘mWindow’
                                      main.cpp:11: error: ‘mWindow’ was not declared in this scope
                                      make: *** [main.o] Error 1

                                      please help[/quote]

                                      Seems that you should read some C++ tutorial first. This are some basic error messages from the compiler. You must be familiar with header and implementation files before you can use Qt successfully.

                                      And as Andre already mentioned, it's hard to analyze the error without the contents of mainwindow.h.

                                      http://www.catb.org/~esr/faqs/smart-questions.html

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                                      • R Offline
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                                        Revu
                                        wrote on last edited by
                                        #23

                                        the code is as below:
                                        @#ifdef MAINWINDOW_H
                                        #define MAINWINDOW_H

                                        #include<QDialog>
                                        #include"subWindow.h"
                                        #include "ui_main.h"

                                        namespace Ui
                                        {
                                        class mainwindow;
                                        }

                                        class mainwindow:public QDialog,public Ui::main
                                        {
                                        Q_OBJECT

                                        public:
                                        explicit mainwindow(QWidget *parent=0);
                                        ~mainwindow();

                                        private slots:
                                        void on_next_click();

                                        };
                                        #endif@

                                        Every fall is to raise higher than Before.

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                                        • R Offline
                                          R Offline
                                          Revu
                                          wrote on last edited by
                                          #24

                                          @Volker:Thank You for your advice.

                                          Can you suggest me few online tutorials to understand the concepts clearly?

                                          Every fall is to raise higher than Before.

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