QTextStream 实时输出到文件

#include "mainwindow.h" #include "ui_mainwindow.h" MainWindow::MainWindow(QWidget *parent) : QMainWindow(parent), ui(new Ui::MainWindow) { ui->setupUi(this); m_file = nullptr; m_stream = nullptr; init(); } MainWindow::~MainWindow() { delete ui; } void MainWindow::on_inputBtn_clicked() { QString str = ui->plainTextEdit->toPlainText(); if(m_stream != nullptr) { *m_stream << str << "\r\n"; m_stream->flush(); } } void MainWindow::init() { QString filePath = qApp->applicationDirPath() + "/log.txt"; m_file = new QFile(filePath); m_stream = new QTextStream(m_file); m_file->open(QIODevice::WriteOnly | QIODevice::Append); } void MainWindow::on_clostBtn_clicked() { if(m_file != nullptr) { m_file->close(); delete m_file; m_file = nullptr; } if(m_stream != nullptr) { delete m_stream; m_stream = nullptr; } }