QT TCP通信收發數據

首先在工程文件.pro中加入

QT       += network

需要加的頭文件

#include <QTcpServer>
#include <QTcpSocket>

---

 

服務端

1.創建初始化對象

mServer = new QTcpServer();

mSocket = new QTcpSocket();

2.關聯客戶端

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

3.啟動監聽服務

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

4.接受數據

mSocket = mServer->nextPendingConnection();//與客戶端通信的套接字

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

5.發送數據

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

---

 

實現代碼

tcpServer::tcpServer(QWidget *parent) :
    QDialog(parent),
    ui(new Ui::tcpServer)
{
    ui->setupUi(this);
    mServer = new QTcpServer();
    //關聯客戶端連接信號newConnection
    connect(mServer,SIGNAL(newConnection()),this,SLOT(new_client())); //連接客戶端
    //啟動服務器監聽
    mServer->listen(QHostAddress::Any,1122);
}
tcpServer::~tcpServer()
{
    delete ui;
}
void tcpServer::new_client()
{
     mSocket = mServer->nextPendingConnection();//與客戶端通信的套接字
     //關聯接收客戶端數據信號readyRead信號（客戶端有數據就會發readyRead信號）
     connect(mSocket,SIGNAL(readyRead()),this,SLOT(read_client_data()));
 }
void tcpServer::read_client_data()
{
     //可以實現同時讀取多個客戶端發送過來的消息
     QTcpSocket *obj = (QTcpSocket*)sender();
     QByteArray msg = obj->readAll();
     unsigned short size = msg.size();
     unsigned char msg1[10] = {0};
     memcpy(msg1, msg.data(), size);
     qDebug()<<msg1[0]<<msg1[1]<<msg1[2]<<msg1[3];
}
 
void tcpServer::on_pushButton_clicked()
{
    unsigned char msg[10];
    msg[0]='*';
    msg[1]=10;
    msg[2]=30;
    msg[4]=1;
    mSocket->write((char*)msg,5);
}

 

---

客戶端

1.創建初始化

mSocket = new QTcpSocket();

2.連接服務器，設置IP和端口

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

3.接收數據

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

QByteArray msg = mSocket->readAll();

4.發送數據

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

---

 

實現代碼

tcpClick::tcpClick(QWidget *parent) :
    QWidget(parent),
    ui(new Ui::tcpClick)
{
    ui->setupUi(this);
    mSocket = new QTcpSocket();
   //關聯數據信號
   connect(mSocket,SIGNAL(readyRead()),this,SLOT(read_data()));
  //連接服務器，設置ip和端口號
    mSocket->connectToHost(QHostAddress::LocalHost,1122);
}
tcpClick::~tcpClick()
{
    delete ui;
}
void tcpClick::read_data()
{
    QByteArray msg = mSocket->readAll();
    unsigned short size = msg.size();
    unsigned char msg1[10] = {0};
    memcpy(msg1, msg.data(), size);
    qDebug()<<msg1[0]<<msg1[1]<<msg1[2]<<msg1[3];
}
 
void tcpClick::on_pushButton_clicked()
{
    unsigned char msg[10];
    msg[0]='*';
    msg[1]=30;
    msg[2]=20;
    msg[4]=11;
    mSocket->write((char*)msg,5);
}