Qt实现简单的TCP协议（客户端的实现）

1、QT提供了QTcpSocket类，可以直接实例化一个客户端。需要在pro文件中添加   QT += network

2、连接服务端

connect(connectbutton,SIGNAL(clicked()),this,SLOT(on_connect_cliked()));

void MyDialog::on_connect_cliked(){

    if(connectbutton->text()=="连接")

    {

        m_socket->connectToHost("192.168.0.103",8899,QTcpSocket::ReadWrite);

        if(!m_socket->waitForConnected())

        {

            qDebug()<<"client connect error";

        }

        else{

            qDebug()<<"已连接上";

            connectbutton->setText("断开");

        }

    }

    else

    {

        m_socket->disconnectFromHost();

        if(m_socket->state()==QAbstractSocket::UnconnectedState

                || m_socket->waitForDisconnected(1000))

        {

            qDebug()<<"已断开";

            connectbutton->setText("连接");

        }

    }

}
3、接受服务端发来的数据

    QTimer *timer = new QTimer;

    connect(timer,SIGNAL(timeout()),this,SLOT(receive_repeat()));

    timer->start(1);

void MyDialog::readData(){

    QByteArray buffer = m_socket->readAll();

    if(!buffer.isEmpty())

    {

       receivee.append(buffer);

       qDebug()<<"添加了数据";

    }

}
4、给服务端发送数据

connect(sendbutton,SIGNAL(clicked()),this,SLOT(send_msg()));

void MyDialog::send_msg(){

    QString data = sendtext->toPlainText();

    if(data != "")

    {

//        qDebug()<<"mydialog sendtext2"<<data;

        m_socket->write(data.toLatin1());

    }

}