Qt snippet — 打开文件&保存文件

打开文件：

 void Notepad::on_actionOpen_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();
         }
 }

保存文件：

 void Notepad::on_actionSave_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();
                 }
             }
 }