qt_client/mainwindow.cpp

#include "mainwindow.h"
#include "./ui_mainwindow.h"

MainWindow::MainWindow(QWidget *parent)
    : QMainWindow(parent), ui(new Ui::MainWindow)
{
    ui->setupUi(this);
    ui->le_server_ip->setText("127.0.0.1");
    ui->le_port->setText("1234");
    // ui->rb_con_sta->setEnabled(false);
    ui->rb_con_sta->setCheckable(false);
    ui->rb_con_sta->setChecked(false);
    connect(ui->bt_start,QPushButton::clicked,this, &MainWindow::start_connet);
    connect(ui->bt_stop,QPushButton::clicked,this, &MainWindow::stop_connet);
    connect(ui->bt_cmd,QPushButton::clicked,this, &MainWindow::send_cmd);
    tcp_socket = nullptr;
}

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

void MainWindow::start_connet()
{
    if (tcp_socket == nullptr)
    {
        tcp_socket = new QTcpSocket(this);
        tcp_socket->connectToHost(ui->le_server_ip->text(), ui->le_port->text().toInt());
        connect(tcp_socket, &QTcpSocket::connected, this, &MainWindow::connected);
        connect(tcp_socket, &QTcpSocket::readyRead, this, &MainWindow::receive_cmd);
    }
}
void MainWindow::connected(){
    ui->rb_con_sta->setCheckable(true);
    ui->rb_con_sta->setChecked(true);
}
void MainWindow::stop_connet()
{
    if (tcp_socket != nullptr)
    {
        tcp_socket->disconnectFromHost();
        delete tcp_socket;
        tcp_socket = nullptr;

    }
    ui->rb_con_sta->setChecked(false);
    ui->rb_con_sta->setCheckable(false);
}

void MainWindow::send_cmd(){

    if (tcp_socket != nullptr)
    {
        ui->tb_msgbox->append("[S]" + ui->le_cmd->text());
        QByteArray data = ui->le_cmd->text().toUtf8();
        tcp_socket->write(data);
    }
}
void MainWindow::receive_cmd()
{
    QByteArray data = tcp_socket->readAll();
    QString str = data.data();
    str="[R]" + str;
    ui->tb_msgbox->append(str);
}