QTcpSocket QTcpServer构建数据网络传输 网络模块（十）

一、简介
QTcpServer Class
The QTcpServer class provides a TCP-based server

QTcpSocket Class
The QTcpSocket class provides a TCP socket

二、代码

#ifndef TCPCLIENT_H
#define TCPCLIENT_H

#include <QObject>
#include <QTcpSocket>
#include <QTcpServer>
#include <QRunnable>
class tcpclient : public QObject
{
    Q_OBJECT
public:
    tcpclient(QObject *parent = nullptr);
private slots:
    void connected();
    void readyRead();
    void error(QAbstractSocket::SocketError socketError);
private:
    QTcpSocket* m_pTcpSocket;
};
class ClientRunnable : public QRunnable
{
public:
    void run();
};

class tcpserver : public QObject
{
    Q_OBJECT
public:
    tcpserver(QObject *parent = nullptr);
private slots:
    void onNewConnection();
    void onReadMessage();

private:
    QTcpServer * m_pTcpServer;
    QTcpSocket * m_pTcpSocket;
};

#endif // TCPCLIENT_H

#include "tcpclient.h"
#include <QTimer>
#include <QDataStream>
#include <QTextCodec>
tcpclient::tcpclient(QObject *parent):
    QObject(parent)
{
    //1. 创建TCP套接字对象
    m_pTcpSocket = new QTcpSocket(this);
    //2. 已连接、数据可读、失败信号连接
    connect(m_pTcpSocket, &QTcpSocket::connected, this, &tcpclient::connected);
    connect(m_pTcpSocket, &QIODevice::readyRead, this, &tcpclient::readyRead);
    typedef void (QAbstractSocket::*QAbstractSocketErrorSignal)(QAbstractSocket::SocketError);
    connect(m_pTcpSocket, static_cast<QAbstractSocketErrorSignal>(&QTcpSocket::error), this, &tcpclient::error);
    //3. 与服务器端建立连接
    m_pTcpSocket->connectToHost("127.0.0.1", 8888);

     QTimer *ptimer = new QTimer;
    connect(ptimer,&QTimer::timeout,this,[=](){
        QString txt = "client:你好";
        m_pTcpSocket->write(txt.toUtf8());
    });
    ptimer->start(500);

}
void tcpclient::readyRead()
{
    QByteArray ba = m_pTcpSocket->readAll();
    qDebug()<<"tcpclient:"<<QString::fromUtf8(ba);
}

void tcpclient::connected()
{
    qDebug() << "SimpleTcpSocketClientDemo::connected  successfully";
}

void tcpclient::error(QAbstractSocket::SocketError socketError)
{
    qDebug() << "tcpclient::error " << socketError;
}

void ClientRunnable::run()
{
    tcpclient* pSimpleTcpSocketClient = new tcpclient;
}

tcpserver::tcpserver(QObject *parent):
    QObject(parent)
{
    m_pTcpServer = new QTcpServer();
    m_pTcpServer->listen(QHostAddress::Any,8888);
    connect(m_pTcpServer,&QTcpServer::newConnection,this,&tcpserver::onNewConnection);
}
void tcpserver::onNewConnection()
{
    m_pTcpSocket = m_pTcpServer->nextPendingConnection();
    connect(m_pTcpSocket,&QTcpSocket::readyRead,this,&tcpserver::onReadMessage);
}
void tcpserver::onReadMessage()
{
    QByteArray ba = m_pTcpSocket->readAll();
    qDebug()<<"tcpserver:"<<QString::fromUtf8(ba);
    QString txt = "server:你好";
    m_pTcpSocket->write(txt.toUtf8());
}

三、总结
1.客户端创建套接字，连接指定ip和端口，等待套接字触发的readyRead()信号
2.服务端创建QTcpServer监听端口，获取有效链接，等待套接字触发的readyRead()信号
3.注意发送方 接收方编码解码，不然会有乱码显示