对QT学习之路12－14的源代码补充与修正

      QT学习之路12－14的源代码有些不完整，为了更好的让大家学习，本人做了一点修正与补充，谢谢。源代码如下：

      头文件：     

#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QtGui/QMainWindow>
#include <QLabel>
#include <QStatusBar>

class QAction;
//public class QLabel;

class MainWindow : public QMainWindow
{
        Q_OBJECT

public:
        MainWindow(QWidget *parent = 0);
        ~MainWindow();
private slots:
        void open();

private:
        QAction *openAction;
        QLabel  *msgLabel;
};

#endif // MAINWINDOW_H

主源代码：mainwindow.cpp

#include <QtGui/QAction>
#include <QtGui/QMenu>
#include <QtGui/QMenuBar>
#include <QtGui/QKeySequence>
#include <QtGui/QToolBar>
#include <QMessageBox>
//#include <QLabel>
#include "mainwindow.h"

MainWindow::MainWindow(QWidget *parent)
        : QMainWindow(parent)
{
        openAction = new QAction(tr("&Open"), this);
        openAction->setShortcut(QKeySequence::Open);
        openAction->setStatusTip(tr("Open a file."));
        openAction->setIcon(QIcon(":/2.png"));
        connect(openAction, SIGNAL(triggered()), this, SLOT(open()));

        QMenu *file = menuBar()->addMenu(tr("&File"));
        file->addAction(openAction);

        QToolBar *toolBar = addToolBar(tr("&File"));
        toolBar->addAction(openAction);
        msgLabel = new QLabel;
        msgLabel->setMinimumSize(msgLabel->sizeHint());
        msgLabel->setAlignment(Qt::AlignHCenter);
        statusBar()->addWidget(msgLabel);
}
void MainWindow::open()
{
        QMessageBox::information(NULL, tr("Open"), tr("Open a file"));
}

MainWindow::~MainWindow()
{

}

主函数main.cpp

 

#include <QtGui/QApplication>
#include "mainwindow.h"

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    MainWindow w;
    w.show();
    return a.exec();
}

图标文件依据原文制作使用