（十五）qt-tcp

基本流程

QT       += core gui network

#include "tcp.h"
#include "ui_tcp.h"
#include <QDebug>

Tcp::Tcp(QWidget *parent) :
    QWidget(parent),
    ui(new Ui::Tcp)
{
    ui->setupUi(this);
    // ui init
    ui->ip_edit->setText("127.0.0.1");
    ui->port_edit->setText("9999");
    // 实例化
    server = new QTcpServer(this);
    // 监听
    server->listen(QHostAddress("127.0.0.1"),9999);
    // 新的链接
    connect(server, &QTcpServer::newConnection, this, [=](){
        // 接收客户端套接字对象
        // sock_addr 结构体 == 类 QTcpSocket
        conn = server->nextPendingConnection();
        ui->log_text->append("有新的链接");
        // 接收数据
        connect(conn,&QTcpSocket::readyRead, this, [=](){
            QByteArray array = conn->readAll();
            ui->log_text->append(array);
        });

    });
    connect(ui->send, &QPushButton::clicked, this, [=](){
        // 发送数据 QTextEdit
       conn->write(ui->input_text->toPlainText().toUtf8());
       ui->log_text->append("Me Say: " + ui->input_text->toPlainText());
       ui->input_text->clear();
    });

}

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

#ifndef TCP_H
#define TCP_H

#include <QWidget>
#include <QTcpSocket>
#include <QTcpServer>

namespace Ui {
class Tcp;
}

class Tcp : public QWidget
{
    Q_OBJECT

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

private:
    Ui::Tcp *ui;

    QTcpServer *server;
    QTcpSocket *conn;
};

#endif // TCP_H

#include "client.h"
#include "ui_client.h"

Client::Client(QWidget *parent) :
    QWidget(parent),
    ui(new Ui::Client)
{
    ui->setupUi(this);
    // ui init
    ui->cip_edit->setText("127.0.0.1");
    ui->cport_edit->setText("9999");
    // 实例化
    client = new QTcpSocket(this);
    // 链接服务器
    client->connectToHost(QHostAddress("127.0.0.1"),9999);

    // 接收数据
    connect(client, &QTcpSocket::readyRead, this, [=](){
        QByteArray array = client->readAll();
        ui->clog_text->append(array);
    });

    connect(ui->csend, &QPushButton::clicked, this, [=](){
       client->write(ui->cinput_text->toPlainText().toUtf8());
       ui->clog_text->append("Me Say: " + ui->cinput_text->toPlainText().toUtf8());
       ui->cinput_text->clear();
    });

}

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

#ifndef CLIENT_H
#define CLIENT_H

#include <QWidget>
#include <QTcpServer>
#include <QTcpSocket>

namespace Ui {
class Client;
}

class Client : public QWidget
{
    Q_OBJECT

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

private:
    Ui::Client *ui;

    QTcpSocket* client;
};

#endif // CLIENT_H