#include "widget.h"
#include "ui_widget.h"Widget::Widget(QWidget *parent): QWidget(parent), ui(new Ui::Widget)
{ui->setupUi(this);// 服务端有QTcpServer库，封装了监听操作server = new QTcpServer();// 直接监听，内部根据传入的ip和端口进行绑定server->listen(QHostAddress::AnyIPv4, SERVER_PORT);// 对server进行新的连接信号建立信号槽connect(server, &QTcpServer::newConnection, this, &Widget::newClientHandler);}Widget::~Widget()
{delete ui;
}void Widget::newClientHandler()
{// 将获取到的新的连接套接字中获取客户端ip和端口socket = server->nextPendingConnection();ui->hostLineEdit->setText(socket->peerAddress().toString());ui->portLineEdit->setText(QString::number(socket->peerPort()));// 新的消息到来时，connect 数据read和处理信号槽函数connect(socket, &QTcpSocket::readyRead, this, &Widget::clientInfoSlot);
}void Widget::clientInfoSlot()
{ui->chatLineEdit->setText(QString(socket->readAll()));
}void Widget::on_closeButton_clicked()
{socket->close();
}

// tcpclient
#include "widget.h"
#include "ui_widget.h"Widget::Widget(QWidget *parent): QWidget(parent), ui(new Ui::Widget)
{ui->setupUi(this);socket = new QTcpSocket;
}Widget::~Widget()
{delete ui;
}void Widget::on_connectButton_clicked()
{// 连接服务器socket->connectToHost(ui->hostLineEdit->text(), ui->portLineEdit->text().toInt());// 连接成功后，socket会发出一个connected的信号，使用lambda作为信号槽函数connect(socket, &QTcpSocket::connected, [this](){// 打开一个新的聊天窗口，这里不能局部变量，因为新窗口需要长久显示// 在堆区申请空间，否则对象生命周期结束后就释放了// 聊天窗口需要进行发送，所以需要socket// 原来的登录窗口需要进行隐藏this->hide();Chat *ct = new Chat(socket);ct->show();});
}

// 建立连接成功后的聊天窗口
#include "chat.h"
#include "ui_chat.h"
#
Chat::Chat(QTcpSocket *socket, QWidget *parent) :QWidget(parent),ui(new Ui::Chat)
{ui->setupUi(this);this->socket = socket;
}Chat::~Chat()
{delete ui;
}void Chat::on_sendButton_clicked()
{QByteArray ba;ba.append(ui->chatLineEdit->text());socket->write(ba);
}