QT编写tcp通信工具(Server端)
本文实例为大家分享了QT编写Server端的tcp通信工具的具体代码,供大家参考,具体内容如下
1.说明
使用qt写一个类似网上常见的网络调试工具。此篇为Server端。Client端在上一篇。
2.基本流程
新建QTcpServer对象,为其newConnection信号写槽函数。此为新的Client连接信号,在其对应槽函数里使用nextPendingConnection方法获取Client对象,并为Client添加readyRead(读数据),disconnected(断开连接)两个信号写槽函数。
开始监听使用Server的listen方法,停止监听使用Server的close方法。
主动断开某个连接可使用Client对象的disconnectFromHost方法。需要注意的是,这会触发disconnected信号。应小心处理,避免重复删除链表,导致程序崩溃。
3.代码
这是mainwindow.cpp文件
#include "mainwindow.h" #include <QApplication> MainWindow::MainWindow(QWidget *parent) : QMainWindow(parent), ui(new Ui::MainWindow) { ui->setupUi(this); ui->splitter->setStretchFactor(0,2); ui->splitter->setStretchFactor(1,1); tcpServer = new QTcpServer(this); //qWarning()<<QNetworkInterface().allAddresses(); QString ip=getLocalip(); if( ip.isEmpty() ) { QMessageBox::about(this,tr("提示"),tr("无本地IP。") ) ; } else{ ui->ledtIp->setText( ip ); //本地IP } ui->labHostName->setText(tr("HostName:")+ QHostInfo::localHostName() ); ui->labHostName->adjustSize(); ui->ledtPort->setText(tr("8080")); ui->btnOpen->setEnabled(true); ui->btnSend->setEnabled(false); iplistMenu = new QMenu( ui->lwdgClientsIp ); iplistMenu->addAction(ui->actiondel); connect( ui->actiondel, SIGNAL(triggered()), this, SLOT(slot_delmenu())); connect(tcpServer, SIGNAL(newConnection()), this, SLOT(slot_newConnectionClient())); } MainWindow::~MainWindow() { delete ui; } //获取本地IP /* QString MainWindow::getLocalip() { QHostInfo info = QHostInfo::fromName( QHostInfo::localHostName() ); foreach(QHostAddress addr,info.addresses()) { if(addr.protocol()==QAbstractSocket::IPv4Protocol) { return addr.toString(); } } return ""; } */ QString MainWindow::getLocalip() { QList<QHostAddress> list = QNetworkInterface::allAddresses(); foreach (QHostAddress address, list) { if( address.protocol() == QAbstractSocket::IPv4Protocol) { return address.toString(); } } return ""; } //处理来自新的client连接 void MainWindow::slot_newConnectionClient() { while (tcpServer->hasPendingConnections()) { QTcpSocket *client = tcpServer->nextPendingConnection(); tcpClients.append(client); ui->lwdgClientsIp->addItem( tr("%1:%2").arg(client->peerAddress().toString()).arg(client->peerPort()) ); connect(client, SIGNAL(readyRead()), this, SLOT(slot_readData())); connect(client, SIGNAL(disconnected()), this, SLOT(slot_disconnectedClient())); } } //接收数据 void MainWindow::slot_readData() { QTcpSocket *obj = (QTcpSocket*)sender(); QByteArray buf = obj->readAll(); if(buf.isEmpty()) return; QString ipc; ipc = tr("[%1:%2]>").arg(obj->peerAddress().toString()).arg(obj->peerPort()); ui->teRecive->appendPlainText(ipc); ui->teRecive->appendPlainText(buf); } //断开连接处理 void MainWindow::slot_disconnectedClient() { if( !tcpClients.isEmpty() ){ QTcpSocket *obj = (QTcpSocket*)sender(); QListWidgetItem *item = ui->lwdgClientsIp->findItems( tr("%1:%2")\ .arg( obj->peerAddress().toString())\ .arg( obj->peerPort()),Qt::MatchContains|Qt::MatchEndsWith ).at(0); ui->lwdgClientsIp->removeItemWidget( item ); delete item; obj->close(); tcpClients.removeOne(obj); } } //打开监听与停止 void MainWindow::on_btnOpen_clicked() { if(ui->btnOpen->text() == "停止")//主动停止监听 { if( !tcpClients.isEmpty() ) for(int i=0; i<tcpClients.length(); i++)//断开所有连接 { tcpClients[i]->disconnectFromHost(); //会触发disconnected信号 } tcpClients.clear(); tcpServer->close(); ui->lwdgClientsIp->clear(); ui->btnOpen->setText("监听"); ui->btnSend->setEnabled(false); }else{ //打开监听 if( ui->ledtPort->text().toInt() == 0 ) { QMessageBox::about(this,tr("提示"),tr("请输入端口号。") ) ; } else if( tcpServer->listen( QHostAddress::AnyIPv4 , ui->ledtPort->text().toInt() ) ) { ui->btnOpen->setText("停止"); ui->btnSend->setEnabled(true); } } } //发送数据,UTF8模式 void MainWindow::on_btnSend_clicked() { if( ui->lwdgClientsIp->selectedItems().length() >0 ){ foreach( QListWidgetItem* item ,ui->lwdgClientsIp->selectedItems() ) { QString clientIP = item->text().split(":")[0]; int clientPort = item->text().split(":")[1].toInt(); for(int i=0; i<tcpClients.length(); i++) { if(tcpClients[i]->peerAddress().toString()==clientIP && tcpClients[i]->peerPort()==clientPort) { tcpClients[i]->write(ui->teSend->toPlainText().toUtf8() ); break; } } } } } //“删除”菜单,停止某个Client void MainWindow:: slot_delmenu() { if( lwdgitem != NULL ) { if( !tcpClients.isEmpty() ){ QString clientIP = lwdgitem->text().split(":")[0]; int clientPort = lwdgitem->text().split(":")[1].toInt(); for(int i=0; i<tcpClients.length(); i++) { if(tcpClients[i]->peerAddress().toString()==clientIP && tcpClients[i]->peerPort()==clientPort) { tcpClients[i]->disconnectFromHost(); break; } } } } } //弹出菜单 void MainWindow::on_lwdgClientsIp_customContextMenuRequested(const QPoint &pos) { lwdgitem=ui->lwdgClientsIp->itemAt(pos ) ;//判断是否在项目上 if( lwdgitem != NULL ) { iplistMenu->exec(QCursor::pos()); } }
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