QT5实现简单的TCP通信例程

#include "mainwindow.h" #include "ui_mainwindow.h" MainWindow::MainWindow(QWidget *parent) : QMainWindow(parent), ui(new Ui::MainWindow) { ui->setupUi(this); ui->lineEdit_Port->setText("8765"); ui->pushButton_Send->setEnabled(false); server = new QTcpServer(); //连接信号槽 connect(server,&QTcpServer::newConnection,this,&MainWindow::server_New_Connect); } MainWindow::~MainWindow() { server->close(); server->deleteLater(); delete ui; } void MainWindow::on_pushButton_Listen_clicked() { if(ui->pushButton_Listen->text() == tr("侦听")) { //从输入框获取端口号 int port = ui->lineEdit_Port->text().toInt(); //监听指定的端口 if(!server->listen(QHostAddress::Any, port)) { //若出错，则输出错误信息 qDebug()<<server->errorString(); return; } //修改按键文字 ui->pushButton_Listen->setText("取消侦听"); qDebug()<< "Listen succeessfully!"; } else { //如果正在连接 if(socket->state() == QAbstractSocket::ConnectedState) { //关闭连接 socket->disconnectFromHost(); } //取消侦听 server->close(); //修改按键文字 ui->pushButton_Listen->setText("侦听"); //发送按键失能 ui->pushButton_Send->setEnabled(false); } } void MainWindow::on_pushButton_Send_clicked() { qDebug() << "Send: " << ui->textEdit_Send->toPlainText(); //获取文本框内容并以ASCII码形式发送 socket->write(ui->textEdit_Send->toPlainText().toLatin1()); socket->flush(); } void MainWindow::server_New_Connect() { //获取客户端连接 socket = server->nextPendingConnection(); //连接QTcpSocket的信号槽，以读取新数据 QObject::connect(socket, &QTcpSocket::readyRead, this, &MainWindow::socket_Read_Data); QObject::connect(socket, &QTcpSocket::disconnected, this, &MainWindow::socket_Disconnected); //发送按键使能 ui->pushButton_Send->setEnabled(true); qDebug() << "A Client connect!"; } void MainWindow::socket_Read_Data() { QByteArray buffer; //读取缓冲区数据 buffer = socket->readAll(); if(!buffer.isEmpty()) { QString str = ui->textEdit_Recv->toPlainText(); str+=tr(buffer); //刷新显示 ui->textEdit_Recv->setText(str); } } void MainWindow::socket_Disconnected() { //发送按键失能 ui->pushButton_Send->setEnabled(false); qDebug() << "Disconnected!"; }