QT网络编程开发客户端

上一篇：QT网络编程开发服务端

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文章目录

• • • 基于Qt网络编程客户端
    • QTcpSocket
    • • 配置
      • Public
      • • connectToHost()
        • waitForConnected
      • SIGNAL
      • • disconnected()
        • readyRead()
    • TcpClient项目训练
    • • widget.h
      • widget.cpp

来源：微信公众号「编程学习基地」

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效果演示

QTcpSocket 类提供一个TCP套接字TCP是一个面向连接，可靠的的通信协议，非常适合于连续不断的数据传递

QTcpSocket 是QAbstractSocket类非常方便的一个子类，让你创建一个TCP连接和数据流交流。

QTcpSocket 信号：

readyRead()	//有数据发送过来时触发该信号
disconnected()	//socket->close()触发disconnected()信号,客户端服务端都触发
           

pro文件添加

QT += network
           

连接服务器，参数为服务器地址和端口号

QString ipAddressStr = ui->lineEditAddress->text();
quint16 port = ui->lineEditPort->text().toInt();
socket->connectToHost(ipAddressStr, port);
if(socket->waitForConnected(3000))
{
	//连接成功
	qDebug() << "connect secess";
}
else
{
    qDebug() << socket->errorString();
    return;
}
           

connect(socket, SIGNAL(disconnected()),this,SLOT(disconnectedSlot()));//客户端断开连接
           

connect(socket, SIGNAL(readyRead()),this, SLOT(readyReadSlot())); //接收消息
           

QByteArray dataBa = socket->readAll();
           

#ifndef WIDGET_H
#define WIDGET_H

#include <QWidget>
#include <QTcpSocket>
#include <QMessageBox>
#include <QDateTime>

namespace Ui {
class Widget;
}

class Widget : public QWidget
{
    Q_OBJECT

public:
    explicit Widget(QWidget *parent = nullptr);
    ~Widget();

private slots:
    void on_pushButtonConnect_clicked();
    void disconnectedSlot();
    void readyReadSlot();
    void on_pushButtonSend_clicked();

private:
    Ui::Widget *ui;
    QTcpSocket *socket;
    bool socketState;
};
#endif // WIDGET_H
           

#include "widget.h"
#include "ui_widget.h"

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

    socket = new QTcpSocket;
    socketState = false;

    connect(socket, SIGNAL(disconnected()),this, SLOT(disconnectedSlot()));     //客户端断开连接
    connect(socket, SIGNAL(readyRead()),this, SLOT(readyReadSlot()));           //接收消息
}

Widget::~Widget()
{
    delete ui;
}

void Widget::on_pushButtonConnect_clicked()
{
    QString ipAddressStr = ui->lineEditAddress->text();
    quint16 port = ui->lineEditPort->text().toInt();

    if(!socketState)
    {
        socket->connectToHost(ipAddressStr, port);
        if(socket->waitForConnected(3000))
        {
            qDebug() << "Connect2Server OK";
            ui->pushButtonConnect->setText("断开连接");
            socketState = true;
        }
        else
        {
            qDebug() << socket->errorString();
            return;
        }
    }
    else
    {
        socket->close();
        ui->pushButtonConnect->setText("连接");
        socketState = false;
    }
}

void Widget::disconnectedSlot()
{
    qDebug()<<"Socket close";
}

void Widget::readyReadSlot()
{
    QByteArray dataBa = socket->readAll();

    QString str = QString(QDateTime::currentDateTime().toString("yyyy.MM.dd hh:mm:ss ddd")) +
            ":Recv\n" + str.fromLocal8Bit(dataBa.data());    //本地GBK转Unicode 解决乱码
    ui->textBrowserRecv->append(QString(str));          //送显示
}

void Widget::on_pushButtonSend_clicked()
{
    QString dataStr = ui->textEditSend->toPlainText();
    //QByteArray data = dataStr.toUtf8();        //发送UTF编码数据
    QByteArray data = dataStr.toLocal8Bit();     //发送本地字符(GBK)

    if(socket->isOpen() && socket->isValid())
    {
        socket->write(data);
    }

    QString str = QString(QDateTime::currentDateTime().toString("yyyy.MM.dd hh:mm:ss ddd")) +
            ":Recv\n" + str.fromLocal8Bit(data.data());    //本地GBK转Unicode 解决乱码
    ui->textBrowserRecv->append(QString(str));          //送显示
}