QT TCP通信收发数据

首先在工程文件.pro中加入

QT       += network

需要加的头文件

#include <QTcpServer>
#include <QTcpSocket>

---

服务端

1.创建初始化对象

mServer = new QTcpServer();

mSocket = new QTcpSocket();

2.关联客户端

connect(mServer,SIGNAL(newConnection()),this,SLOT(new_client()));

3.启动监听服务

mServer->listen(QHostAddress::Any,1122);

4.接受数据

mSocket = mServer->nextPendingConnection();//与客户端通信的套接字

connect(mSocket,SIGNAL(readyRead()),this,SLOT(read_client_data()));

5.发送数据

mSocket->write((char*)msg,5);

---

实现代码

 1 tcpServer::tcpServer(QWidget *parent) : 2     QDialog(parent), 3     ui(new Ui::tcpServer) 4 { 5     ui->setupUi(this); 6     mServer = new QTcpServer(); 7     //关联客户端连接信号newConnection 8     connect(mServer,SIGNAL(newConnection()),this,SLOT(new_client())); //连接客户端 9     //启动服务器监听10     mServer->listen(QHostAddress::Any,1122);11 }12 tcpServer::~tcpServer()13 {14     delete ui;15 }16 void tcpServer::new_client()17 {18      mSocket = mServer->nextPendingConnection();//与客户端通信的套接字19      //关联接收客户端数据信号readyRead信号（客户端有数据就会发readyRead信号）20      connect(mSocket,SIGNAL(readyRead()),this,SLOT(read_client_data()));21  }22 void tcpServer::read_client_data()23 {24      //可以实现同时读取多个客户端发送过来的消息25      QTcpSocket *obj = (QTcpSocket*)sender();26      QByteArray msg = obj->readAll();27      unsigned short size = msg.size();28      unsigned char msg1[10] = {0};29      memcpy(msg1, msg.data(), size);30      qDebug()<<msg1[0]<<msg1[1]<<msg1[2]<<msg1[3];31 }32  33 void tcpServer::on_pushButton_clicked()34 {35     unsigned char msg[10];36     msg[0]='*';37     msg[1]=10;38     msg[2]=30;39     msg[4]=1;40     mSocket->write((char*)msg,5);41 }

---

客户端

1.创建初始化

mSocket = new QTcpSocket();

2.连接服务器，设置IP和端口

mSocket->connectToHost(QHostAddress::LocalHost,1122);

3.接收数据

connect(mSocket,SIGNAL(readyRead()),this,SLOT(read_data()));

QByteArray msg = mSocket->readAll();

4.发送数据

mSocket->write((char*)msg,5);

---

实现代码

 1 tcpClick::tcpClick(QWidget *parent) : 2     QWidget(parent), 3     ui(new Ui::tcpClick) 4 { 5     ui->setupUi(this); 6     mSocket = new QTcpSocket(); 7    //关联数据信号 8    connect(mSocket,SIGNAL(readyRead()),this,SLOT(read_data())); 9   //连接服务器，设置ip和端口号10     mSocket->connectToHost(QHostAddress::LocalHost,1122);11 }12 tcpClick::~tcpClick()13 {14     delete ui;15 }16 void tcpClick::read_data()17 {18     QByteArray msg = mSocket->readAll();19     unsigned short size = msg.size();20     unsigned char msg1[10] = {0};21     memcpy(msg1, msg.data(), size);22     qDebug()<<msg1[0]<<msg1[1]<<msg1[2]<<msg1[3];23 }24  25 void tcpClick::on_pushButton_clicked()26 {27     unsigned char msg[10];28     msg[0]='*';29     msg[1]=30;30     msg[2]=20;31     msg[4]=11;32     mSocket->write((char*)msg,5);33 }