QT网络编程Tcp下C/S架构的即时通信实例分享

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先写一个客户端，实现简单的，能加入聊天，以及加入服务器的界面。

  #ifndef TCPCLIENT_H  #define TCPCLIENT_H     #include <QDialog>  #include <QListWidget>  #include <QLineEdit>  #include <QPushButton>  #include <QLabel>  #include <QGridLayout>  #include <QtNetWork/QHostAddress>  #include <QtNetWork/QTcpSocket>     class TcpClient : public QDialog  {   Q_OBJECT     public:   TcpClient(QWidget *parent = 0,Qt::WindowFlags f=0);   ~TcpClient();  private:   QListWidget *contentListWidget;   QLineEdit *sendLineEdit;   QPushButton *sendBtn;   QLabel *userNameLabel;   QLineEdit *userNameLineEdit;   QLabel *serverIPLabel;   QLineEdit *serverIPLineEdit;   QLabel *portLabel;   QLineEdit *portLineEdit;   QPushButton *enterBtn;   QGridLayout *mainLayout;   bool status;   int port;   QHostAddress *serverIP;   QString userName;   QTcpSocket *tcpSocket;  public slots:   void slotEnter();   void slotConnected();   void slotDisconnected();   void dataReceived();   void slotSend();  };     #endif // TCPCLIENT_H

有一个加入服务器的按钮，还有一个发送消息的按钮，在头文件，先定义两个函数。

  #include "tcpclient.h"  #include <QMessageBox>  #include <QHostInfo>     TcpClient::TcpClient(QWidget *parent,Qt::WindowFlags f)   : QDialog(parent,f)  {   setWindowTitle(tr("TCP Client"));      contentListWidget = new QListWidget;      sendLineEdit = new QLineEdit;   sendBtn = new QPushButton(tr("send"));      userNameLabel = new QLabel(tr("name"));   userNameLineEdit = new QLineEdit;      serverIPLabel = new QLabel(tr("server"));   serverIPLineEdit = new QLineEdit;      portLabel = new QLabel(tr("port"));   portLineEdit = new QLineEdit;      enterBtn= new QPushButton(tr("join chat"));      mainLayout = new QGridLayout(this);   mainLayout->addWidget(contentListWidget,0,0,1,2);   mainLayout->addWidget(sendLineEdit,1,0);   mainLayout->addWidget(sendBtn,1,1);   mainLayout->addWidget(userNameLabel,2,0);   mainLayout->addWidget(userNameLineEdit,2,1);   mainLayout->addWidget(serverIPLabel,3,0);   mainLayout->addWidget(serverIPLineEdit,3,1);   mainLayout->addWidget(portLabel,4,0);   mainLayout->addWidget(portLineEdit,4,1);   mainLayout->addWidget(enterBtn,5,0,1,2);      status = false;      port = 8010;   portLineEdit->setText(QString::number(port));      serverIP =new QHostAddress();      connect(enterBtn,SIGNAL(clicked()),this,SLOT(slotEnter()));   connect(sendBtn,SIGNAL(clicked()),this,SLOT(slotSend()));      sendBtn->setEnabled(false);  }     TcpClient::~TcpClient()  {     }     void TcpClient::slotEnter()  {   if(!status)   {    QString ip = serverIPLineEdit->text();    if(!serverIP->setAddress(ip))    {     QMessageBox::information(this,tr("error"),tr("server ip address error!"));     return;    }       if(userNameLineEdit->text()=="")    {     QMessageBox::information(this,tr("error"),tr("User name error!"));     return;    }       userName=userNameLineEdit->text();       tcpSocket = new QTcpSocket(this);    connect(tcpSocket,SIGNAL(connected()),this,SLOT(slotConnected()));    connect(tcpSocket,SIGNAL(disconnected()),this,SLOT(slotDisconnected()));    connect(tcpSocket,SIGNAL(readyRead()),this,SLOT(dataReceived()));       tcpSocket->connectToHost(*serverIP,port);       status=true;   }   else   {    int length=0;    QString msg=userName+tr(":Leave Chat Room");    if((length=tcpSocket->write(msg.toLatin1(),msg.length()))!=msg. length())    {     return;    }       tcpSocket->disconnectFromHost();       status=false;   }  }     void TcpClient::slotConnected()  {   sendBtn->setEnabled(true);   enterBtn->setText(tr("离开"));      int length=0;   QString msg=userName+tr(":Enter Chat Room");   if((length=tcpSocket->write(msg.toLatin1(),msg.length()))!=msg.length())   {    return;   }  }     void TcpClient::slotSend()  {   if(sendLineEdit->text()=="")   {    return ;   }      QString msg=userName+":"+sendLineEdit->text();      tcpSocket->write(msg.toLatin1(),msg.length());   sendLineEdit->clear();  }     void TcpClient::slotDisconnected()  {   sendBtn->setEnabled(false);   enterBtn->setText(tr("join chat"));  }     void TcpClient::dataReceived()  {   while(tcpSocket->bytesAvailable()>0)   {    QByteArray datagram;    datagram.resize(tcpSocket->bytesAvailable());       tcpSocket->read(datagram.data(),datagram.size());       QString msg=datagram.data();    contentListWidget->addItem(msg.left(datagram.size()));   }  }

实现界面布局。在Enter槽函数中，确定加入还是离开的服务器的功能。如果加入了，就将消息，写到tcpsocket中，构造消。

服务端的头文件：

  #ifndef TCPSERVER_H  #define TCPSERVER_H     #include <QDialog>  #include <QListWidget>  #include <QLabel>  #include <QLineEdit>  #include <QPushButton>  #include <QGridLayout>  #include "server.h"     class TcpServer : public QDialog  {   Q_OBJECT     public:   TcpServer(QWidget *parent = 0,Qt::WindowFlags f=0);   ~TcpServer();  private:   QListWidget *ContentListWidget;   QLabel *PortLabel;   QLineEdit *PortLineEdit;   QPushButton *CreateBtn;   QGridLayout *mainLayout;   int port;   Server *server;  public slots:   void slotCreateServer();   void updateServer(QString,int);  };     #endif // TCPSERVER_H

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