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.

Quote:

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

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I added textEdit from QT GUI.

How can I Fix this ??

Quote:

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Here is the mainwindow.h file.

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Code:

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#ifndef MAINWINDOW_H
#define MAINWINDOW_H
 
#include <QMainWindow>
#include "wordpad.h"
 
namespace Ui {
class MainWindow;
}
 
class MainWindow : public QMainWindow, WordPad
{
    Q_OBJECT
 
public:
    explicit MainWindow(QWidget *parent = 0);
    ~MainWindow();
 
private slots:
    void on_actionCopy_triggered();
 
protected:
    Ui::MainWindow *ui;
 
};
 
#endif // MAINWINDOW_H

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Quote:

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Here is the mainwindow.cpp file.

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Code:

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#include "mainwindow.h"
#include "ui_mainwindow.h"
 
MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);
 
    this->setCentralWidget(ui->textEdit);
}
 
MainWindow::~MainWindow()
{
    delete ui;
}
 
void MainWindow::on_actionCopy_triggered()
{
    WordPad copymain;
 
    copymain.copy();
}

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Quote:

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Here is the wordpad.h file.

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Code:

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#ifndef WORDPAD_H
#define WORDPAD_H
 
 
class WordPad
{
public:
    WordPad();
    void copy();
 
};
 
#endif // WORDPAD_H

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Quote:

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Here is the wordpad.cpp file.

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Code:

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#include "wordpad.h"
 
WordPad::WordPad()
{
 
}
 
void WordPad::copy()
{
    ui->textEdit->copy();
}

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

To your question:

Quote:

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How can I Fix this ??

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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.