QTcpServer简单用法

   我们都知道TCP是面向流的，连接的可靠传输协议。QTcpServer就是基于TCP协议的服务端。它调用listen() 方法进行监听客户端的连接，建立连接之后便可以进行通信。以下是简单的demo。

服务器代码

class TCPServer: public QObject{Q_OBJECTpublic:TCPServer(QObject *parent = NULL);~TCPServer();void star();void close();protected slots:void newConnectSlot();void showReceiptMessageSlot();private:QTcpServer              *m_pServer;};

TCPServer::TCPServer(QObject *parent /* = NULL */):QObject(parent){}TCPServer::~TCPServer(){}void TCPServer::star(){m_pServer = new QTcpServer();m_pServer->listen(QHostAddress::Any,8888);connect(m_pServer,SIGNAL(newConnection ()),this,SLOT(newConnectSlot()));cout<<"Server Running ......"<<endl;}void TCPServer::close(){m_pServer->close();}void TCPServer::newConnectSlot(){QTcpSocket *pSocket = m_pServer->nextPendingConnection();m_SocketVec.push_back(pSocket);connect(pSocket,SIGNAL(readyRead()),this,SLOT(showReceiptMessageSlot()));}void TCPServer::showReceiptMessageSlot(){QTcpSocket *pSenderSocket = qobject_cast<QTcpSocket*>(sender());QByteArray mesArray = pSenderSocket->readAll();string strMes(mesArray);std::cout<<strMes<<endl;pSenderSocket->write("hi,welcome...");    //回发给客户端的消息}

客户端代码

class Client : public QDialog{Q_OBJECTpublic:Client(QWidget *parent = 0, Qt::WFlags flags = 0);~Client();private slots:void sendMessageClickSlot();void showReceiveMessageSlot();private:QTcpSocket     *m_pSocket;QLabel         *m_pRecieveMesLbl;QLabel         *m_pMessageLbl;QLineEdit      *m_pMessageLEdit;QPushButton    *m_pSendMesBtn;};

Client::Client(QWidget *parent, Qt::WFlags flags): QDialog(parent, flags){m_pMessageLbl = new QLabel(tr("Message:"),this);m_pMessageLEdit = new QLineEdit(this);m_pSendMesBtn = new QPushButton(tr("Sending"),this);m_pSocket = new QTcpSocket();m_pRecieveMesLbl = new QLabel(this);m_pRecieveMesLbl->setGeometry(5,30,200,20);m_pMessageLbl->setGeometry(5,5,100,20);m_pMessageLEdit->setGeometry(110,5,100,20);m_pSendMesBtn->setGeometry(220,5,50,20);m_pSocket->connectToHost(QHostAddress::LocalHost,8888);connect(m_pSendMesBtn,SIGNAL(clicked()),this,SLOT(sendMessageClickSlot()));connect(m_pSocket,SIGNAL(readyRead()),this,SLOT(showReceiveMessageSlot()));//ui.setupUi(this);}Client::~Client(){}void Client::sendMessageClickSlot(){QString text = m_pMessageLEdit->text();m_pSocket->write(text.toLocal8Bit());}void Client::showReceiveMessageSlot(){QByteArray mesArray = m_pSocket->readAll();QString strMes(mesArray);m_pRecieveMesLbl->setText(tr(mesArray.constData()));}

结果截图