Qt 강좌 22 QFile 파일

Qt 강좌 22 QFile 파일 

레이아웃 : plainTextEdit, Push Button 2개

소스코드

#include "mainwindow.h"

#include "ui_mainwindow.h"

#include <QFile>

#include <QTextStream>

#include <QMessageBox>

MainWindow::MainWindow(QWidget *parent) :

    QMainWindow(parent),

    ui(new Ui::MainWindow)

{

    ui->setupUi(this);

}

MainWindow::~MainWindow()

{

    delete ui;

}

void MainWindow::on_pushButton_clicked()

{

    QFile file("/home/pi/qtfile.txt");

    if(!file.open(QFile::WriteOnly | QFile::Text))

    {

        QMessageBox::warning(this,"title","file not open");

    }

    QTextStream out(&file);

    QString text = ui->plainTextEdit->toPlainText();

    out << text;

    file.flush();

    file.close();

}

void MainWindow::on_pushButton_2_clicked()

{

    QFile file("/hoem/pi/qtfile.txt");

    if(!file.open(QFile::ReadOnly | QFile::Text))

    {

        QMessageBox::warning(this,"title","file not open");

    }

    QTextStream in(&file);

    QString text = in.readAll();

    ui->plainTextEdit->setPlainText(text);

    file.close();

}