Ui not in scope

[davidrhcp]

This is my code for main.cpp
@
#include "mainwindow.h"
#include <QApplication>
#include <cstdlib>
#include <QNetworkConfiguration>
#include <QDebug>
#include <QDir>
#include <QFileInfo>
#include <QNetworkAccessManager>
#include <QNetworkConfiguration>
#include <mainwindow.h>
#include <QFile>
#include <QString>
#include <QIODevice>
#include <QtGui>

void Write(QString MBW){

QFile mFile(MBW);

if (mFile.open(QIODevice::WriteOnly))
{
QTextStream out(&mFile);
out << ui->lineEdit->text();
}

}
int main(int argc, char *argv[])
{

QApplication a(argc, argv);
MainWindow w;
w.show();

// creating directory upon run for user input
QDir mDir;
mDir.mkpath("C:/Monice/BW");


QString mFile = ("C:/Monice/BW/MBW.txt");

return a.exec();

}
@
The ui apparently is not in the declared in the scope
not sure what to do

[andreyc EDIT]: Added '@' around the code. Please use '@' around your source code, log output, etc.

[andreyc]

What are you trying to achieve?

ui is a member of MainWindow class and is not accessible from standalone function void Write(QString MBW)

[davidrhcp]

im trying to get a push button to save the text entered by a user into a line edit box to save the text to a file in a directory. this is the main.cpp

@#include "mainwindow.h"
#include <QApplication>
#include <cstdlib>
#include <QNetworkConfiguration>
#include <QDebug>
#include <QDir>
#include <QFileInfo>
#include <QNetworkAccessManager>
#include <QNetworkConfiguration>
#include <mainwindow.h>
#include <QFile>
#include <QString>
#include <QIODevice>
#include <QtGui>

void Write(QString MBW){

QFile mFile(MBW);

if (mFile.open(QIODevice::WriteOnly))

{
QTextStream out(&mFile);
out << ui->lineEdit->text();
}

}
int main(int argc, char *argv[])
{

QApplication a(argc, argv);
MainWindow w;
w.show();

// creating directory upon run for user input
QDir mDir;
mDir.mkpath("C:/Monice/BW");


QString mFile = ("C:/Monice/BW/MBW.txt");

return a.exec();

}
@

This is the main window.cpp

@#include "mainwindow.h"
#include "ui_mainwindow.h"
#include "QObject"
#include "QtCore"
#include "QNetworkConfigurationManager"
#include "QNetworkInterface"
#include "QHostAddress"
#include "QString"
#include "QFile"
#include "QLineEdit"
#include "QDir"
#include "QApplication"
#include "QMainWindow"

MainWindow::MainWindow(QWidget *parent) :
QMainWindow(parent),
ui(new Ui::MainWindow)

{
ui->setupUi(this);

//display network interfaces
QList<QNetworkInterface> list = QNetworkInterface::allInterfaces();

// each interface is allocated one after the other in a list

foreach (QNetworkInterface mon, list)

//adding the list to be shown in the interface combobox
{
ui->comboBox_Interface->addItem(mon.name());
}

// a for loop that counts from 50-90 in multiples of 5
for (int i = 50; i <= 90; i += 5)
//selecting the combox alert to diplay the figures 50-90 with a % symbol
{
    ui->comboBox_Alert->addItem(QString::number(i) + "%");
}

}

MainWindow::~MainWindow()
{
delete ui;
}

QFile::MBW()
{
mfile;
}

void MainWindow::on_save_clicked()
{

}
@

and this is the header

@#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QMainWindow>
#include <QString>
#include <QObject>
#include <QFile>
namespace Ui {
class MainWindow;
}

class MainWindow : public QMainWindow
{
Q_OBJECT

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

private slots:

void on_save_clicked();

private:
Ui::MainWindow *ui;
};

#endif // MAINWINDOW_H
@

[edit: added missing coding tags @ SGaist]

[andreyc]

Please add '@' around your code to make it better readable.

You use private variable of a class MainWindow in standalone function. It is not going to work in C++.

Make Write() a member of MainWindow
or
provide a getter function in MainWindow for ui and use it in Write.

[davidrhcp]

thanks
how would i make the write() a function. a lot of QT documents is about the Q strings and so fourth. i dont even understand members, functions and classes, could you suggest a link that may help? also sorry about the code thing, how do i add @ around the code?

[andreyc]

[quote author="davidrhcp" date="1399404981"]i don't even understand members, functions and classes, could you suggest a link that may help? [/quote]
I would suggest to read some books about C++ to get more info about classes, etc
"Here is good list of the books":http://stackoverflow.com/questions/388242/the-definitive-c-book-guide-and-list
"Online C++ tutorial":http://www.learncpp.com/
"another C++ tutorial":http://www.cplusplus.com/doc/tutorial/

[quote author="davidrhcp" date="1399404981"]also sorry about the code thing, how do i add @ around the code?[/quote]
To make your code looks pretty just put character "@" before the code and after.
Like below but without quotation marks
"@"
int main()
{
}
"@"

[andreyc]

In your example try to delete function Write() from main.cpp
and put its content into void MainWindow::on_save_clicked()

@
void MainWindow::on_save_clicked()
{
// creating directory upon run for user input
QDir mDir;
mDir.mkpath("C:/Monice/BW");

QString MBW = ("C:/Monice/BW/MBW.txt");

QFile mFile(MBW);

if (mFile.open(QIODevice::WriteOnly))
{
    QTextStream out(&mFile);
    out << ui->lineEdit->text();
} 

}
@

[davidrhcp]

thank u, you have been an awesome help! some good sources there as well really appreciated