QT4 一个简单的打开文件功能

header.h文件代码

#ifndef HEADER_H
#define HEADER_H
#include <QMainWindow>
#include <QLabel>
class QTextEdit;
class QFileDialog;
class CMainWindow :public QMainWindow{
    Q_OBJECT
public:
    CMainWindow();
private:
    //QDockWidget* dockWidget;
    QLabel * label;
    QLabel * label2;
    QMenu *menuF;
    QMenu *menuT;
    QMenu *menuE;
    QToolBar *filetoolbar;
    QToolBar *edittoolbar;
    QToolBar *toolbar;
    QAction *actNew;
    QAction *actSave;
    QAction *actSaveAs;
    QAction *actOpen;
    QAction *actClose;
    QAction *actQuit;
    QAction *actUndo;
    QAction *actCut;
    QAction *actCopy;
    QAction *actPast;
    QAction *actAll;
    QAction *actFind;
    QTextEdit *textEdit;
    QFileDialog *filedialog;
    void inimenu();
    void iniDockWidth();
    void iniToolBar();
    void iniCentraWidget();
    void findDialog();
public slots:
    void openFile();
    void loadFile(const QString filename);
};
#endif // HEADER_H

main.cpp 代码

#include <QMainWindow>
#include <QDockWidget>
#include <QApplication>
#include <QFileDialog>
#include <QMessageBox>
#include <QTextEdit>
#include <QTextStream>
#include <QPushButton>
#include "header.h"
CMainWindow::CMainWindow(){
    textEdit=new QTextEdit(this);
    this->setCentralWidget(textEdit);
    QPushButton *btn=new QPushButton(this);
    btn->setText("OPen File");
    btn->show();
    connect(btn,SIGNAL(clicked()),this,SLOT(openFile()));
}
void CMainWindow::openFile(){
    filedialog=new QFileDialog(this);
    QString filename=filedialog->getOpenFileName(this);
    if(!filename.isEmpty()){
        loadFile(filename);
    }
}
void CMainWindow::loadFile(const QString filename){
    QFile file(filename);
    if(!file.open(QFile::ReadOnly | QFile::Text)){
        QMessageBox msg;
        msg.setText("error !");
        msg.show();
    }
    QTextStream in(&file);
    textEdit->setText(in.readAll());
}
int main(int argc,char **argv){
    QApplication app(argc,argv);
    CMainWindow main;
    main.show();
    return app.exec();
}

本来是要做个记事本的。。时间不多了 先放上 下面 将会一步步完善这个记事本功能。。。。