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Thread: My class isnt working properly and i dont know why (Newbie)

  1. #1
    Join Date
    Apr 2020
    Posts
    3
    Qt products
    Qt4
    Platforms
    Windows

    Unhappy My class isnt working properly and i dont know why (Newbie)

    Hi!
    Im new to Qt and im trying to make a class, that will create a board of buttons, depending on a user's choice but it doesnt work properly and i dont know why...

    here is my code

    rysuj_plansze.h

    Qt Code:
    1. #ifndef RYSUJ_PLANSZE_H
    2. #define RYSUJ_PLANSZE_H
    3.  
    4. #include <QPushButton>
    5. #include <QGridLayout>
    6.  
    7.  
    8. class rysuj_plansze
    9. {
    10. public:
    11. void rysuj();
    12. private:
    13. QPushButton *button;
    14. };
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    rysuj_plansze.cpp

    Qt Code:
    1. #include "rysuj_plansze.h"
    2. #include <QApplication>
    3. #include <QLabel>
    4. #include <QtWidgets>
    5. #include <QtCore>
    6. #include <QMessageBox>
    7. #include <QDialog>
    8.  
    9. void rysuj_plansze::rysuj()
    10. {
    11.  
    12. QWidget *window = new QWidget;
    13. QGridLayout *layout = new QGridLayout;
    14. window->setWindowTitle("TIc-Tac-Toe");
    15.  
    16.  
    17.  
    18. QMessageBox msgBox;
    19. msgBox.addButton("3na3", QMessageBox::YesRole);
    20. msgBox.addButton("5na5", QMessageBox::NoRole);
    21. msgBox.setIcon(QMessageBox::Question);
    22. msgBox.setText("Which board do you chose?");
    23. msgBox.exec();
    24.  
    25.  
    26.  
    27.  
    28. if(msgBox.exec() == QMessageBox::Yes)
    29. {
    30. int width = 3;
    31. int height = 3;
    32.  
    33. for(int i = 0; i<height; i++)
    34. {
    35. for(int j = 0; j<width; j++)
    36. {
    37. QPushButton *button = new QPushButton;
    38. layout->addWidget(button,i,j);
    39. }
    40. }
    41. }
    42.  
    43.  
    44.  
    45. else if(msgBox.exec() == QMessageBox::No)
    46. {
    47. int width = 20;
    48. int height = 20;
    49.  
    50. for(int i = 0; i<height; i++)
    51. {
    52. for(int j = 0; j<width; j++)
    53. {
    54. QPushButton *button = new QPushButton;
    55. layout->addWidget(button,i,j);
    56. }
    57. }
    58. }
    59.  
    60.  
    61.  
    62. window->setLayout(layout);
    63. window->show();
    64. }
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    main.cpp

    Qt Code:
    1. #include "rysuj_plansze.h"
    2. #include <QApplication>
    3. #include <QLabel>
    4. #include <QtWidgets>
    5. #include <QtCore>
    6. #include <QDialog>
    7.  
    8. int main(int argc, char *argv[])
    9. {
    10. QApplication app(argc, argv);
    11.  
    12.  
    13. rysuj_plansze R;
    14. R.rysuj();
    15.  
    16.  
    17. return app.exec();
    18. }
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    When i try to run it in main.cpp the messagebox is displayed multiple times (instead of being displayed once) and in the end the window with the board is empty(instead of being 3on3 or 20on20)
    Last edited by 22eragon22; 20th April 2020 at 23:18.

  2. #2
    Join Date
    Jul 2008
    Location
    Germany
    Posts
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    Thanks
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    Qt products
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    Platforms
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    Default Re: My class isnt working properly and i dont know why (Newbie)

    Hi, you call QMessageBox::exec() multiple times:
    line 23: msgBox.exec();
    line 28: if(msgBox.exec() == QMessageBox::Yes)
    line 45: else if(msgBox.exec() == QMessageBox::No)
    Each time the messagebox is shown. Call exec() only once and store the return value for use in the if() and else if() lines, or use switch-case.

    Ginsengelf

  3. #3
    Join Date
    Apr 2020
    Posts
    3
    Qt products
    Qt4
    Platforms
    Windows

    Default Re: My class isnt working properly and i dont know why (Newbie)

    Thank You! its working rn!!!

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