C++-Qt【2】-实现一个简单的记事本
用Qt实现一个简单的记事本:
#include "helloqt.h" #include <qfiledialog.h> #include <qfile.h> #include <qmessagebox.h> #include <qtextstream.h> #include <qdebug.h> //#if _MSC_VER >= 1600 //#pragma execution_character_set("utf-8") //#endif HelloQt::HelloQt(QWidget *parent) : QMainWindow(parent) { ui.setupUi(this); } HelloQt::~HelloQt() { } void HelloQt::on_pushButton_clicked() { qDebug() << "new line"; ui.textEdit->append("你点击了我!"); } void HelloQt::on_action_Open_triggered() { QString fileName = QFileDialog::getOpenFileName(this, tr("Open File"), QString(), tr("Text Files (*.txt);;C++ Files (*.cpp *.h)")); if (!fileName.isEmpty()) { QFile file(fileName); if (!file.open(QIODevice::ReadOnly)) { QMessageBox::critical(this, tr("Error"), tr("Could not open file")); return; } QTextStream in(&file); ui.textEdit->setText(in.readAll()); file.close(); } } void HelloQt::on_action_Save_triggered() { QString fileName = QFileDialog::getSaveFileName(this, tr("Save File"), QString(), tr("Text Files (*.txt);;C++ Files (*.cpp *.h)")); if (!fileName.isEmpty()) { QFile file(fileName); if (!file.open(QIODevice::WriteOnly)) { // error message } else { QTextStream stream(&file); stream << ui.textEdit->toPlainText(); stream.flush(); file.close(); } } } void HelloQt::on_action_Exit_triggered() { qApp->exit(0); }