QT【day4】

chat_QT服务器端：

//.h
#ifndef WIDGET_H
#define WIDGET_H#include <QWidget>
#include<QTcpServer>    //服务器类
#include<QTcpSocket>    //客户端类
#include<QMessageBox>   //对话框类
#include<QList>     //链表容器
#include<QDebug>    //信息调试类QT_BEGIN_NAMESPACE
namespace Ui { class Widget; }
QT_END_NAMESPACEclass Widget : public QWidget
{Q_OBJECTpublic:Widget(QWidget *parent = nullptr);~Widget();private slots:void on_pushButton_clicked();void newConnection_slot();void readyRead_muslot();private:Ui::Widget *ui;//定义服务器指针QTcpServer *server;//定义客户端容器QList<QTcpSocket *>socketList;};
#endif // WIDGET_H

//.cpp
#include "widget.h"
#include "ui_widget.h"Widget::Widget(QWidget *parent): QWidget(parent), ui(new Ui::Widget)
{ui->setupUi(this);//给服务器指针实例化空间server = new QTcpServer(this);
}Widget::~Widget()
{delete ui;
}void Widget::on_pushButton_clicked()
{//获取ui界面上的端口号quint16 port = ui->lineEdit->text().toUInt();//将服务器设置监听状态if(server->listen(QHostAddress::Any, port)){QMessageBox::information(this, "提示", "客户端连接成功");}else{QMessageBox::information(this, "提示", "客户端连接失败");}//将客户端想要连接时服务器发射的newConnect信号与对应槽函数连接connect(server, &QTcpServer::newConnection, this, &Widget::newConnection_slot);}//处理newCOnnection信号对应的槽函数
void Widget::newConnection_slot(){//获取最新连接的客户端套接字QTcpSocket *s = server->nextPendingConnection();//将套接字放入客户端容器中socketList.push_back(s);//将readyRead信号与对应的槽函数连接connect(s, &QTcpSocket::readyRead, this, &Widget::readyRead_muslot);}void Widget::readyRead_muslot(){//移除无效的客户端for(int i = 0; i < socketList.count(); i++){//查看客户端状态if(socketList.at(i) == 0){socketList.removeAt(i);}}//遍历客户端套接字，查看那个客户端有数据for(int i = 0; i < socketList.count(); i++){//判断套接字中是否有数据QByteArray msg = socketList.at(i)->readAll();//将数据显示到ui界面上ui->listWidget->addItem(QString::fromLocal8Bit(msg));//将数据发射给所有的客户端套接字中for(int j = 0; j < socketList.count(); j++){socketList.at(j)->write(msg);}}}

思维导图：