Qt(day4)

思维导图

 QT连接TCP网络通信

服务器

ser.h

#ifndef SER_H
#define SER_H
 
#include 
#include    //服务器头文件
#include    //客户端头文件
#include   //消息对话框
#include         //链表头文件
 
QT_BEGIN_NAMESPACE
namespace Ui { class Ser; }
QT_END_NAMESPACE
 
class Ser : public QWidget
{
    Q_OBJECT
 
public:
    Ser(QWidget *parent = nullptr);
    ~Ser();
 
private slots:
    void on_connectbtn_clicked();
 
    void newConnection_slot();  //处理newConnection信号的槽函数
    void readyRead_slot();      //处理readyRead信号的槽函数
 
private:
    Ui::Ser *ui;
 
    QTcpServer *server;             //定义服务器指针
    QList clientList; //定义客户端容器
};
#endif // SER_H

ser.cpp

#include "ser.h"
#include "ui_ser.h"
 
Ser::Ser(QWidget *parent)
    : QWidget(parent)
    , ui(new Ui::Ser)
{
    ui->setupUi(this);
 
    server=new QTcpServer(this);    //实例化一个服务器
 
    connect(server,&QTcpServer::newConnection,this,&Ser::newConnection_slot);
}
 
Ser::~Ser()
{
    delete ui;
}
 
//启动服务器按钮对应的槽函数
void Ser::on_connectbtn_clicked()
{
    quint16 port=ui->portbtn->text().toUInt();
    if(server->listen(QHostAddress::Any,port)){
        QMessageBox::information(this,"成功","服务器启动成功");
    }
    else{
        QMessageBox::information(this,"失败","服务器启动失败");
        return;
    }
}
//处理newConnection信号的槽函数
void Ser::newConnection_slot(){
    QTcpSocket *s=server->nextPendingConnection();  //获取最新连接的客户端套接字
 
    clientList.push_back(s);    //将套接字放入客户端链表中
 
    connect(s,&QTcpSocket::readyRead,this,&Ser::readyRead_slot);
}
//处理readyRead信号的槽函数
void Ser::readyRead_slot(){
    for(int i=0;i<clientList.count();i++){
        if(clientList[i]->state()==0){
            clientList.removeAt(i);
        }
    }
 
    for(int i=0;i<clientList.count();i++){
        if(clientList[i]->bytesAvailable()!=0){
            QByteArray msg=clientList[i]->readAll();
            ui->msgwidget->addItem(QString::fromLocal8Bit(msg));
 
            for(int j=0;j<clientList.count();j++){
                clientList[j]->write(msg);
            }
        }
    }
}

客户端

cli.h

#ifndef CLI_H
#define CLI_H
 
#include 
#include
#include
 
QT_BEGIN_NAMESPACE
namespace Ui { class cli; }
QT_END_NAMESPACE
 
class cli : public QWidget
{
    Q_OBJECT
 
public:
    cli(QWidget *parent = nullptr);
    ~cli();
 
private slots:
    void on_connectbtn_clicked();
    void on_sendbtn_clicked();
    void on_disconnectbtn_clicked();
 
    void connected_slot();
    void readyRead_slot();
    void disconnected_slot();
 
 
private:
    Ui::cli *ui;
 
    QTcpSocket *socket;
 
    QString username;
};
#endif // CLI_H

cli.cpp

#include "cli.h"
#include "ui_cli.h"
 
cli::cli(QWidget *parent)
    : QWidget(parent)
    , ui(new Ui::cli)
{
    ui->setupUi(this);
 
    socket=new QTcpSocket(this);
 
    ui->disconnectbtn->setEnabled(false);
    ui->sendbtn->setEnabled(false);
    ui->msgedit->setEnabled(false);
 
    connect(socket,&QTcpSocket::connected,this,&cli::connected_slot);
 
    connect(socket,&QTcpSocket::readyRead,this,&cli::readyRead_slot);
 
    connect(socket, &QTcpSocket::disconnected, this, &cli::disconnected_slot);
}
 
cli::~cli()
{
    delete ui;
}
 
void cli::on_connectbtn_clicked()
{
    username=ui->usernameedit->text();
    QString ip=ui->ipedit->text();
    quint16 port=ui->portedit->text().toUInt();
 
    socket->connectToHost(ip,port);
}
 
void cli::connected_slot(){
    ui->disconnectbtn->setEnabled(true);
    ui->sendbtn->setEnabled(true);
    ui->msgedit->setEnabled(true);
    ui->usernameedit->setEnabled(false);
    ui->ipedit->setEnabled(false);
    ui->portedit->setEnabled(false);
    ui->connectbtn->setEnabled(false);
    QMessageBox::information(this,"成功","成功进入聊天室");
    QString msg=username+": 进入聊天室";
 
    socket->write(msg.toLocal8Bit());
}
 
void cli::readyRead_slot(){
    QByteArray msg=socket->readAll();
 
    ui->msgwidget->addItem(QString::fromLocal8Bit(msg));
}
 
void cli::on_sendbtn_clicked()
{
    QString msg=username+": "+ui->msgedit->text();
 
    socket->write(msg.toLocal8Bit());
 
    ui->msgedit->clear();
}
 
void cli::on_disconnectbtn_clicked()
{
    QString msg=username+": 离开聊天室";
 
    socket->write(msg.toLocal8Bit());
 
    socket->disconnectFromHost();
}
 
void cli::disconnected_slot(){
    ui->disconnectbtn->setEnabled(false);
    ui->sendbtn->setEnabled(false);
    ui->msgedit->setEnabled(false);
    ui->usernameedit->setEnabled(true);
    ui->ipedit->setEnabled(true);
    ui->portedit->setEnabled(true);
    ui->connectbtn->setEnabled(true);
    QMessageBox::information(this,"退出","退出成功");
}

效果图

 绘制一个时钟

clockwidget.h

#ifndef CLOCKWIDGET_H
#define CLOCKWIDGET_H
 
#include 
#include
#include
#include
 
class ClockWidget : public QWidget
{
    Q_OBJECT
public:
    ClockWidget(QWidget *parent = nullptr);
 
protected:
    void paintEvent(QPaintEvent *);
};
 
#endif // CLOCKWIDGET_H

clockwidget.cpp

#include "clockwidget.h"
 
 
ClockWidget::ClockWidget(QWidget *parent) : QWidget(parent)
{
    setFixedSize(400, 400);
 
    QTimer *timer = new QTimer(this);
    connect(timer, &QTimer::timeout, this, QOverload<>::of(&ClockWidget::update));
    timer->start(1000);
}
 
void ClockWidget::paintEvent(QPaintEvent *)
{
    QPainter painter(this);
    QTime currentTime = QTime::currentTime();
 
    painter.setRenderHint(QPainter::Antialiasing, true);
    painter.translate(width() / 2, height() / 2);
    painter.scale(width() / 200.0, height() / 200.0);
    painter.setPen(Qt::NoPen);
    painter.setBrush(Qt::white);
    painter.drawEllipse(QPoint(0, 0), 90, 90);
 
    painter.setPen(Qt::black);
    for (int i = 1; i <= 12; ++i) {
        painter.drawLine(0, 70, 0, 80);
        painter.rotate(30);
    }
 
    painter.setPen(Qt::gray);
    for (int i = 0; i < 60; ++i) {
        if (i % 5 != 0)
            painter.drawLine(0, 70, 0, 75);
        painter.rotate(6);
    }
 
    //时针
    painter.setPen(Qt::black);
    painter.save();
    painter.rotate(30.0 * ((currentTime.hour() + currentTime.minute() / 60.0)));
    painter.drawLine(0, 0, 0, -40);
    painter.restore();
 
    //分针
    painter.setPen(Qt::blue);
    painter.save();
    painter.rotate(6.0 * ((currentTime.minute() + currentTime.second() / 60.0)));
    painter.drawLine(0, 0, 0, -60);
    painter.restore();
 
    //秒针
    painter.setPen(Qt::red);
    painter.save();
    painter.rotate(6.0 * currentTime.second());
    painter.drawLine(0, 0, 0, -70);
    painter.restore();
 
    painter.setPen(Qt::black);
    painter.setBrush(Qt::black);
    painter.drawEllipse(QPoint(0, 0), 3, 3);
}

效果图