Qt中利用TCP实现客户端与服务器端的数据传输

最近想用Qt做一个简单的聊天室,用到了TCP传输,在此整理一下有关TCP传输的东西。(只是简单的实现数据传送,对于一些出错情况没有考虑,适于新手学习,本人也是个菜鸟)

在Qt中有QTcpsockey和QTcpserver两个类,QTcpserver主要是用来在服务器端监听客户端的连接请求,QTcpsocket用来传输数据。

服务器的建立:在.h文件中添加  

    QTcpSocket *m_tcpsocket;
    QTcpServer *m_tcpserver;
.cpp中添加:
 
  
    m_tcpserver = new QTcpServer(this);
    m_tcpsocket = new QTcpSocket(this);
    m_tcpserver->listen(QHostAddress::Any,6666);//监听的端口号
    connect(m_tcpserver,SIGNAL(newConnection()),
            this,SLOT(newConnect()));
 
  
 
  
void Widget::newConnect()
{
    m_tcpsocket = m_tcpserver->nextPendingConnection();//设置监听
 
  
    connect(m_tcpsocket,SIGNAL(readyRead()),
            this,SLOT(readMessage())); //服务器接收客户端的消息
    connect(m_tcpsocket,SIGNAL(disconnected()),
                m_tcpsocket,SLOT(deleteLater()));
 
  
}

服务器端发送数据:
 
  
void Widget::readMessage()
{
    QDataStream in(m_tcpsocket);
    in.setVersion (QDataStream::Qt_5_4);
    in >> message;
    qDebug() << "ser message" << message;
    ui->textBrowser->setText(tr("reveived client message: '%1'").arg(message));
}
服务器端接受数据:
 
  
void Widget::sendMessage()
{
    QString string = ui->lineEdit->text();
    QByteArray message;
    QDataStream out(&message,QIODevice::WriteOnly);
    out.setVersion(QDataStream::Qt_5_4);
    out< 
  
    m_tcpsocket->write(message);
}

客户端的建立
在.h中:
 
  
   QTcpSocket *m_tcpsocket;
在.cpp中
 
  
void Widget::tcpServerConnect()
{
    m_tcpsocket = new QTcpSocket(this);
    m_tcpsocket->abort();
    m_tcpsocket->connectToHost(QHostAddress::LocalHost,6666);//设置客户端的端口号
    connect(m_tcpsocket,SIGNAL(readyRead()),
            this,SLOT(readMessage()));//用于接受数据
//    m_tcpsocket->connectToHost("localhost",6666);
}
发送数据:
void Widget::sendMessage()
{
     QString string = ui->lineEdit->text();
     QByteArray message;
     QDataStream out(&message,QIODevice::WriteOnly);
     out.setVersion(QDataStream::Qt_5_4);
     out< 
  
     m_tcpsocket->write(message);
 
  
}
接收数据
void Widget::readMessage()
{
    QDataStream in(m_tcpsocket);
    in.setVersion(QDataStream::Qt_5_4);
 
  
    QString greeting;
    in >> greeting;
    ui->lineEdit_2->setText(tr("received server message '%1'").arg(greeting));
}
希望大家共同学习,有错误积极指出。 
  
完整代码下载地址:http://download.csdn.net/download/qq_33425353/9573296

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