简介

通过TCP使PC和android手机相互通讯。

准备

使用QT的网络模块

QT       += core gui network

greaterThan(QT_MAJOR_VERSION, 4): QT += widgets

.h

定义TCP接口

#include <QTcpSocket>

class MainWindow : public QMainWindow
{
    Q_OBJECT

public:
    explicit MainWindow(QWidget *parent = 0);
    ~MainWindow();

private slots:
	void socket_ReadData();
	void socket_Disconnected();
private:
    Ui::MainWindow *ui;
    QTcpSocket *socket;
};

.cpp

MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);

    socket = new QTcpSocket();

    //连接信号槽
    QObject::connect(socket, &QTcpSocket::readyRead, this, &MainWindow::socket_Read_Data);
    QObject::connect(socket, &QTcpSocket::disconnected, this, &MainWindow::socket_Disconnected);
}

void tcpDemo(bool isConnect, QString IP,int port)
{
    //获取IP地址: IP
    //获取端口号: port
	if(isConnect)
	{
    //取消已有的连接
    socket->abort();
    //连接服务器
    socket->connectToHost(IP, port);

    //等待连接成功
    if(!socket->waitForConnected(30000))
    {
        qDebug() << "Connection failed!";
        return;
    }
    qDebug() << "Connect successfully!";)
    }
    else
    {
        //断开连接
        socket->disconnectFromHost();
	}
}

发送TCP数据

void Send_data(QString data)
{
     //获取文本框内容并以ASCII码形式发送
    socket->write(data).toLatin1());
    socket->flush();
}

读取TCP数据

void MainWindow::socket_ReadData()
{
    QByteArray buffer;
    //读取缓冲区数据
    buffer = socket->readAll();
    if(!buffer.isEmpty())
    {
    	//读取TCP数据
        QString str = ui->textEdit_Recv->toPlainText();
        str+=tr(buffer);
        
        //str数据处理
       		 //。。。
    }
}

void MainWindow::socket_Disconnected()
{
    qDebug() << "Disconnected!";
}