QTcpSocket网络套字节通讯

实现服务器端和客户端，接收方式均采用槽接收方式，过程中可F1 F2查看官方文档

服务端

新建类，选择基类

源文件

.h文件

#ifndef SOCKET_H
#define SOCKET_H


#include <QObject>
#include <qtcpserver.h>
#include <qtcpsocket.h>


class socket : public QObject
{
    Q_OBJECT
public:
    explicit socket(int port,QObject *parent = nullptr);


    QTcpServer *tcpServer;
    QTcpSocket *tcpSocket;
    void WriteData(QByteArray bytes);
public slots:
    void acceptConnection();
    void readData();
};


#endif // SOCKET_H

.cpp文件

#include "socket.h"


socket::socket(int port, QObject *parent) : QObject(parent)
{
    tcpServer = new QTcpServer();
    tcpServer->listen(QHostAddress::Any,port);
    tcpSocket = nullptr;
    connect(tcpServer,SIGNAL(newConnection()),this,SLOT(acceptConnection()));
}


void socket::acceptConnection(){
    qDebug()<<"connect";
    tcpSocket = tcpServer->nextPendingConnection();
    connect(tcpSocket,SIGNAL(readyRead()),this,SLOT(readData()));
    connect(tcpSocket, &QAbstractSocket::disconnected,tcpSocket, &QObject::deleteLater);
}


void socket::readData(){
    QByteArray bytes = tcpSocket->readAll();
    qDebug()<<bytes;
}


void socket::WriteData(QByteArray bytes){
    if(tcpSocket->isOpen()){
        tcpSocket->write(bytes);
    }
}

需要注意的点

1. 需要引用两个头文件qtcpserver.h 和 qtcpsocket.h，两个里面包含了服务端和客户端
2. 服务端等待连接，有连接过来需要使用socket来进行通讯，里面readyData信号
3. 使用方式在主界面初始化时，socket *m = new socket(6789);

客户端

新建类，选择基类，和服务端一样

源文件

.cpp

#include "socket.h"
#include "servo.h"
#include "vrep.h"


socket::socket(QObject *parent) : QObject(parent)
{
    tcpSocket = new QTcpSocket(parent);
    connect(tcpSocket,SIGNAL(readyRead()),this,SLOT(readData()));
}


void socket::ConnectServer(const QString &hostName,int port){
    tcpSocket->connectToHost(hostName,port);
}
void socket::readData(){
    QByteArray bytes = tcpSocket->readAll();
    qDebug()<<bytes;
}


void socket::WriteData(QByteArray bytes){
    if(tcpSocket!=nullptr && tcpSocket->isOpen()){
        tcpSocket->write(bytes);
    }
    else
        qDebug()<<"disconnection";
}

.h

#ifndef SOCKET_H
#define SOCKET_H


#include <QObject>
#include <qtcpserver.h>
#include <qtcpsocket.h>

class socket : public QObject
{
    Q_OBJECT
public:
    explicit socket(QObject *parent = nullptr);


    QByteArray m_bytes;
    QTcpSocket *tcpSocket;


    void ConnectServer(const QString &hostName,int port);
    void WriteData(QByteArray bytes);
    uint8_t getCheck(QByteArray bytes);
private:
    int receiveLength;
public slots:
    void readData();
};

#endif // SOCKET_H

注意

实例化需要在可访问ui线程中

m_socket = new socket(this);