qt base64轉碼（可用於用戶名密碼的簡單加密）

#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QMainWindow>

namespace Ui {
class MainWindow;
}

class MainWindow : public QMainWindow
{
    Q_OBJECT

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

private slots:
    void on_btn_encode_clicked();

    void on_btn_decode_clicked();

private:
    Ui::MainWindow *ui;
};

#endif // MAINWINDOW_H

#include "mainwindow.h"
#include "ui_mainwindow.h"

MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);
}

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

void MainWindow::on_btn_encode_clicked()
{
    QString src=ui->lineEdit->text();
    ui->lineEdit_2->setText(src.toUtf8().toBase64());
}

void MainWindow::on_btn_decode_clicked()
{
    ui->lineEdit_3->setText(QByteArray::fromBase64(ui->lineEdit_2->text().toUtf8()));
}