模仿qq聊天设计的界面，具有登录和局域网内多人聊天功能

#include "qqchat.h" #include "ui_qqchat.h" #include<QDataStream> #include<QMessageBox> #include<QDateTime> #include<QTableWidget> #include<QComboBox> #include<QFont> #include<QColorDialog> #include<QFileDialog> #include<QDebug> QQChat::QQChat(QWidget *parent,QString name) : QMainWindow(parent), ui(new Ui::QQChat) { ui->setupUi(this); this->myname=name; port=9999; udpSocket=new QUdpSocket(this); //允许其他服务器连接相同端口和地址|重新连接服务器 udpSocket->bind(port,QUdpSocket::ShareAddress|QUdpSocket::ReuseAddressHint); //发送按钮 connect(ui->sendBtn_5,&QPushButton::clicked,this,[=](){ sendMsg(Msg); }); //监听别人发送的数据 connect(udpSocket,&QUdpSocket::readyRead,this,&QQChat::receiveMessage); //新用户进入 sendMsg(UserEnter); connect(ui->exitBtn_5,&QPushButton::clicked,this,[=](){ this->close(); }); //字体 connect(ui->fontCbx_5,&QFontComboBox::currentFontChanged,this,[=](const QFont &font){ //设置全局字体 ui->msgTxtEdit_5->setFontFamily(font.toString()); ui->msgTxtEdit_5->setFocus(); }); //字体大小 void (QComboBox:: *sizeBtn)(const QString &text)=&QComboBox::currentTextChanged; connect(ui->sizeCbx_5,sizeBtn,this,[=](const QString &text){ ui->msgTxtEdit_5->setFontPointSize(text.toDouble()); ui->msgTxtEdit_5->setFocus(); }); //加粗 connect(ui->boldBtn_5,&QToolButton::clicked,this,[=](bool checked){ //是否按下 if(checked){ ui->msgTxtEdit_5->setFontWeight(QFont::Bold); }else{ ui->msgTxtEdit_5->setFontWeight(QFont::Normal); } }); //倾斜 connect(ui->italicTbtn_5,&QToolButton::clicked,this,[=](bool checked){ ui->msgTxtEdit_5->setFontItalic(checked); ui->msgTxtEdit_5->setFocus(); }); //下划线 connect(ui->underlineTbtn_5,&QToolButton::clicked,this,[=](bool checked){ ui->msgTxtEdit_5->setFontUnderline(checked); ui->msgTxtEdit_5->setFocus(); }); //清空 connect(ui->clearTbtn_5,&QToolButton::clicked,this,[=](){ ui->msgBrowser_5->clear(); }); //字体颜色 connect(ui->colorTbtn_5,&QToolButton::clicked,this,[=](){ QColor color=QColorDialog::getColor(color,this); ui->msgTxtEdit_5->setTextColor(color); }); //保存聊天记录 connect(ui->saveTbtn_5,&QToolButton::clicked,this,[=](){ if(ui->msgBrowser_5->toPlainText().isEmpty()){ QMessageBox::warning(this,"警告","保存内容不能为空"); return; } //获取保存文件绝对路径/文件名(窗口标题,文件名,类型) QString fileName=QFileDialog::getSaveFileName(this,"保存聊天记录","聊天记录","(*.txt)"); if(!fileName.isEmpty()){ QFile file(fileName); file.open(QIODevice::WriteOnly|QFile::Text); QTextStream stream(&file); stream<<ui->msgBrowser_5->toPlainText(); file.close(); } }); } QQChat::~QQChat() { delete ui; } void QQChat::closeEvent(QCloseEvent *) { emit closeWidget(); sendMsg(UserLeft); udpSocket->close(); udpSocket->destroyed(); } void QQChat::sendMsg(QQChat::msgType type) { QByteArray array; QDataStream stream(&array,QIODevice::WriteOnly); stream<<type<<this->getName(); switch (type) { case Msg: if(ui->msgTxtEdit_5->toPlainText()=="") { QMessageBox::warning(this,"警告","发送的聊天内容不能为空!"); return; } stream<<this->getMsg(); break; case UserEnter: break; case UserLeft: break; } //书写报文 udpSocket->writeDatagram(array.data(),array.size(),QHostAddress::Broadcast,this->port); } QString QQChat::getName() { return myname; } QString QQChat::getMsg() { QString msg=ui->msgTxtEdit_5->toHtml(); ui->msgTxtEdit_5->clear(); ui->msgTxtEdit_5->setFocus(); return msg; } void QQChat::userEnter(QString username) { bool IsEmpty=ui->tableWidget_5->findItems(username,Qt::MatchExactly).isEmpty(); if(IsEmpty) { QTableWidgetItem *table=new QTableWidgetItem(username); ui->tableWidget_5->insertRow(0); ui->tableWidget_5->setItem(0,0,table); ui->msgBrowser_5->setTextColor(QColor(Qt::gray)); ui->msgBrowser_5->append(username+"已上线"); ui->userNumLbl_5->setText(QString("在线人数:%1").arg(ui->tableWidget_5->rowCount())); sendMsg(UserEnter); } } void QQChat::userLeft(QString username, QString time) { bool isEmpty=ui->tableWidget_5->findItems(username,Qt::MatchExactly).isEmpty(); if(!isEmpty){ int row=ui->tableWidget_5->findItems(username,Qt::MatchExactly).first()->row(); ui->tableWidget_5->removeRow(row); ui->msgBrowser_5->append(username+"用户于"+time+"离开"); ui->userNumLbl_5->setText(QString("在线人数:%1").arg(ui->tableWidget_5->rowCount())); } } void QQChat::receiveMessage() { qint64 size=udpSocket->pendingDatagramSize(); //int mysize= static_cast<int>(size); QByteArray array=QByteArray(size,0); udpSocket->readDatagram(array.data(),size); QDataStream stream(&array,QIODevice::ReadOnly); int mytype; QString name,msg;//用户名 聊天内容 QString time=QDateTime::currentDateTime().toString("yyyy-MM-dd hh:mm:ss"); stream>>mytype; switch (mytype) { case Msg: stream>>name>>msg; ui->msgBrowser_5->setTextColor(QColor(Qt::blue)); ui->msgBrowser_5->append("["+name+"]"+time); ui->msgBrowser_5->append(msg); break; case UserLeft: stream>>name; userLeft(name,time); break; case UserEnter: stream>>name; userEnter(name); break; } }