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Thread: How To Solve This 'ui' was not declared in this scope

  1. #1
    Join Date
    Dec 2017
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    Question How To Solve This 'ui' was not declared in this scope

    I am creating WordPad using C++ by using QT framework. And I have created mainwindow.cpp and mainwindow.h files. Then I have created wordpad.cpp and wordpad.h files. Still, I am very new to QT and C++. So, I don't know lots of things.

    But , when I try to build the project , it gives me this error in wordpad.cpp file.

    D:\Projects & Tests\C++\Projects\WordPad\wordpad.cpp:10: error: 'ui' was not declared in this scope
    ui->textEdit->copy();
    ^
    I added textEdit from QT GUI.

    How can I Fix this ??

    Here is the mainwindow.h file.
    Qt Code:
    1. #ifndef MAINWINDOW_H
    2. #define MAINWINDOW_H
    3.  
    4. #include <QMainWindow>
    5. #include "wordpad.h"
    6.  
    7. namespace Ui {
    8. class MainWindow;
    9. }
    10.  
    11. class MainWindow : public QMainWindow, WordPad
    12. {
    13. Q_OBJECT
    14.  
    15. public:
    16. explicit MainWindow(QWidget *parent = 0);
    17. ~MainWindow();
    18.  
    19. private slots:
    20. void on_actionCopy_triggered();
    21.  
    22. protected:
    23. Ui::MainWindow *ui;
    24.  
    25. };
    26.  
    27. #endif // MAINWINDOW_H
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    Here is the mainwindow.cpp file.
    Qt Code:
    1. #include "mainwindow.h"
    2. #include "ui_mainwindow.h"
    3.  
    4. MainWindow::MainWindow(QWidget *parent) :
    5. QMainWindow(parent),
    6. ui(new Ui::MainWindow)
    7. {
    8. ui->setupUi(this);
    9.  
    10. this->setCentralWidget(ui->textEdit);
    11. }
    12.  
    13. MainWindow::~MainWindow()
    14. {
    15. delete ui;
    16. }
    17.  
    18. void MainWindow::on_actionCopy_triggered()
    19. {
    20. WordPad copymain;
    21.  
    22. copymain.copy();
    23. }
    To copy to clipboard, switch view to plain text mode 

    Here is the wordpad.h file.
    Qt Code:
    1. #ifndef WORDPAD_H
    2. #define WORDPAD_H
    3.  
    4.  
    5. class WordPad
    6. {
    7. public:
    8. WordPad();
    9. void copy();
    10.  
    11. };
    12.  
    13. #endif // WORDPAD_H
    To copy to clipboard, switch view to plain text mode 

    Here is the wordpad.cpp file.
    Qt Code:
    1. #include "wordpad.h"
    2.  
    3. WordPad::WordPad()
    4. {
    5.  
    6. }
    7.  
    8. void WordPad::copy()
    9. {
    10. ui->textEdit->copy();
    11. }
    To copy to clipboard, switch view to plain text mode 
    Last edited by high_flyer; 7th December 2017 at 16:56.

  2. #2
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    Default Re: How To Solve This 'ui' was not declared in this scope

    1. Don't double post
    2. For code use CODE tags not QTCLASS tags.

    To your question:
    How can I Fix this ??
    Where in your WordPad class is any information about a 'ui' member?
    That it the error you got.
    In your MainWindows you have it defined, but not in your WorPad class.
    Last edited by high_flyer; 7th December 2017 at 17:05.
    ==========================signature=============== ==================
    S.O.L.I.D principles (use them!):
    https://en.wikipedia.org/wiki/SOLID_...iented_design)

    Do you write clean code? - if you are TDD'ing then maybe, if not, your not writing clean code.
    Watch these videos, and read his books they are must if you want to write clean code:
    https://sites.google.com/site/unclebobconsultingllc/

    Recommended off-line reading Qt:
    The Foundations of Qt Development (ISBN: 1-59059-831-8)

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