Qt

 1 #include "mainwindow.h" 2 #include "ui_mainwindow.h" 3 #include <QFile> 4 #include <QMessageBox> 5 #include <QTextStream> 6  7 MainWindow::MainWindow(QWidget *parent) : 8     QMainWindow(parent), 9     ui(new Ui::MainWindow)10 {11     ui->setupUi(this);12 13     QString filename = "1.txt";        //当前文件夹中14     QString str = "Qt QFile Test...";  //保存的文本内容15     QFile file(filename);16     if(!file.open(QIODevice::ReadWrite|QIODevice::Text))17     {18         QMessageBox::warning(this,"file write","can't open",QMessageBox::Yes);19 20     }21     QTextStream in(&file);22     in<<str<<"\n";23 24 }25 26 MainWindow::~MainWindow()27 {28       file.close();   // 关闭file29     delete ui;30 }