Qt学习之路_6(Qt局域网聊天软件)

在上2次文章Qt学习之路_5(Qt TCP的初步使用)   Qt学习之路_4(Qt UDP的初步使用) 中已经初步介绍了群聊功能和文件传输功能，这一节中主要在这个基础上加入一个私聊功能。

　　参考文献依旧是：《Qt及Qt Quick开发实战精解》一书中的第5个例子以及http://www.yafeilinux.com/ 网站上的源码。另外这次的私聊功能也是参考网友http://www.qtcn.org/bbs/read-htm-tid-32609.html的，他的程序有些bug，其中最严重的bug是当私聊第二次聊天的时候对方会接收不到信息。这次主要是将这个bug和其它一些小bug修补了，但是仍然有一个漏洞就是：当第二次私聊时，后面那个的发送方收到信息的时候有可能会多一个窗口弹出来。目前还找不到其原因。猜想是：在第一次聊天接收时关闭聊天窗口后，其内存没有释放。但是当窗口关闭时我们觉得其内存释放应该在Qt内部自己实现。

     下面来讲一下私聊发送端和接收端具体实现过程。

     发送端流程图如下：

     

　　

   

　　接收端的流程图如下：

 　　

　　

　　下面来介绍下2者实现的具体过程：

　　A方(主动开始首次发送的一方)：

1. 在主窗口右侧双击自己想与之聊天的B方，此时A方实际上完成的工作有：用B方的主机名和ip地址新建了私聊的类privatechat，在新建该类的过程中，已经设置了显示顶端为：与***聊天中，对方IP：***，且绑定了本地ip和私聊的专用端口，同时设置了信号与槽的联系，即该端口如果有数据输入，则触发槽函数processPendingDatagrams().该函数是char.cpp中的。
2. 当上面的新建私聊类完成后，用通讯对方ip地址和其群聊专用的端口（但用的是主udp群聊的socket进行的）将以下内容分别发送出去：消息类型(Xchat)，用户名，主机名，本地ip地址。完成后，在屏幕中显示私聊窗口。
3. 在私聊窗口中输入需要聊天的内容，单击发送键。该过程玩成的内容有：分别将消息类型(Message)+用户名+本地名+本地IP+消息内容本身通过私聊专用端口发送出去。在私聊窗口中显示主机名+聊天时间，换行后显示消息内容本身。

 

　　B方(第一次信息是他人发送过来的)：

1. 当A在2步骤中用群聊的方法发送其消息类型(Xchat)，其用户名，其主机名，其ip地址后，由于程序运行时已经初始化了widget.cpp中的构造函数，所以每个程序都绑定了本地地址+群聊专用的端口，一旦有数据传入，就触发widget.cpp中的槽函数processPendingDatagrams().
2. 在processPendingDatagrams()函数中，判断消息类型为Xchat后，接收缓存区内接收对方用户名，对方主机名和对方ip地址。并用接收到的主机名和ip地址新建一个私聊类。新建该私聊的过程与A中的步骤1一样。完后在程序中显示私聊窗口。
3. 当对方A按完发送按钮后，通过私聊专用端口绑定槽函数来触发chart.cpp中的processPendingDatagrams()函数，该函数中先读取消息类型(Message)，然后依次读取用户名，主机名，ip地址，消息内容本身，并将对方信息和消息内容显示在聊天窗口中。

 

　　实验结果如下：

　　群聊界面：

 　　

　　

　　私聊界面：

 　　

　　

　　文件传输过程截图：

 　　

　　

 

　　实验总结（下面几点只是暂时的理解）：

1. 使用类时，如果直接用构造函数定义该类的对象，则定义该类的函数接收时，该对象的生命也就结束了，所以如果要在其他函数中定义一个类的对象时并长久使用，可以使用new定义一个对象的初始指针。这样就在内存中永存了。
2. 如果某个窗口类需要显示时直接调用其指针->show()或者其对象-.show(),这个函数只是将内存中该类的对象显示出来而已（因为与界面有关），并不是重新建一个类对象。其表示该类的界面等可以显示，所以一旦show过即使改变了界面的内容，后面也无需一直调用show函数，界面会自动显示的。
3. 当关闭某个窗口时，只是将其隐藏，并没有释放其内存。

 

程序源码（附录有工程code下载链接）：

　widget.h

#ifndef WIDGET_H#define WIDGET_H#include <QWidget>#include <QtNetwork>#include <QtGui>#include "tcpclient.h"#include "tcpserver.h"#include "chat.h"using namespace std::tr1;namespace Ui {    class Widget;}//enum MessageType//{//    Message,//    NewParticipant,//    ParticipantLeft,//    FileName,//    Refuse,//    xchat//};//枚举变量标志信息的类型，分别为消息，新用户加入，和用户退出class Widget : public QWidget{    Q_OBJECTpublic:    explicit Widget(QWidget *parent = 0);    ~Widget();    QString getUserName();    QString getMessage();    chat* privatechat;    chat* privatechat1;protected:    void changeEvent(QEvent *e);    void sendMessage(MessageType type,QString serverAddress="");    void newParticipant(QString userName,QString localHostName,QString ipAddress);    void participantLeft(QString userName,QString localHostName,QString time);    void closeEvent(QCloseEvent *);    void hasPendingFile(QString userName,QString serverAddress,                        QString clientAddress,QString fileName);     bool eventFilter(QObject *target, QEvent *event);//事件过滤器private:    Ui::Widget *ui;    QUdpSocket *udpSocket;    qint32 port;    qint32 bb;    QString fileName;    TcpServer *server;    //chat *privatechat;    QString getIP();    QColor color;//颜色    bool saveFile(const QString& fileName);//保存聊天记录    void showxchat(QString name, QString ip);private slots:    void on_tableWidget_doubleClicked(QModelIndex index);    void on_textUnderline_clicked(bool checked);    void on_clear_clicked();    void on_save_clicked();    void on_textcolor_clicked();    void on_textitalic_clicked(bool checked);    void on_textbold_clicked(bool checked);    void on_fontComboBox_currentFontChanged(QFont f);    void on_fontsizecomboBox_currentIndexChanged(QString );    void on_close_clicked();    void on_sendfile_clicked();    void on_send_clicked();    void processPendingDatagrams();    void sentFileName(QString);    void currentFormatChanged(const QTextCharFormat &format);signals:};#endif // WIDGET_H

 

widget.cpp:

#include "widget.h"#include "ui_widget.h"using namespace std::tr1;Widget::Widget(QWidget *parent) :    QWidget(parent),    ui(new Ui::Widget){    ui->setupUi(this);       this->resize(850,550);    ui->textEdit->setFocusPolicy(Qt::StrongFocus);    ui->textBrowser->setFocusPolicy(Qt::NoFocus);    ui->textEdit->setFocus();    ui->textEdit->installEventFilter(this);//设置完后自动调用其eventFilter函数    privatechat = NULL;    privatechat1 = NULL;    udpSocket = new QUdpSocket(this);    port = 45454;    bb = 0;    udpSocket->bind(port,QUdpSocket::ShareAddress | QUdpSocket::ReuseAddressHint);    connect(udpSocket,SIGNAL(readyRead()),this,SLOT(processPendingDatagrams()));    sendMessage(NewParticipant);    server = new TcpServer(this);    connect(server,SIGNAL(sendFileName(QString)),this,SLOT(sentFileName(QString)));    connect(ui->textEdit,SIGNAL(currentCharFormatChanged(QTextCharFormat)),this,SLOT(currentFormatChanged(const QTextCharFormat)));}void Widget::currentFormatChanged(const QTextCharFormat &format){//当编辑器的字体格式改变时，我们让部件状态也随之改变    ui->fontComboBox->setCurrentFont(format.font());    if(format.fontPointSize()<9)  //如果字体大小出错，因为我们最小的字体为9    {        ui->fontsizecomboBox->setCurrentIndex(3); //即显示12    }    else    {        ui->fontsizecomboBox->setCurrentIndex(ui->fontsizecomboBox->findText(QString::number(format.fontPointSize())));    }    ui->textbold->setChecked(format.font().bold());    ui->textitalic->setChecked(format.font().italic());    ui->textUnderline->setChecked(format.font().underline());    color = format.foreground().color();}void Widget::processPendingDatagrams()   //接收数据UDP{    while(udpSocket->hasPendingDatagrams())    {        QByteArray datagram;        datagram.resize(udpSocket->pendingDatagramSize());        udpSocket->readDatagram(datagram.data(),datagram.size());        QDataStream in(&datagram,QIODevice::ReadOnly);        int messageType;        in >> messageType;        QString userName,localHostName,ipAddress,message;        QString time = QDateTime::currentDateTime().toString("yyyy-MM-dd hh:mm:ss");        switch(messageType)        {            case Message:                {                    in >>userName >>localHostName >>ipAddress >>message;                    ui->textBrowser->setTextColor(Qt::blue);                    ui->textBrowser->setCurrentFont(QFont("Times New Roman",12));                    ui->textBrowser->append("[ " +localHostName+" ] "+ time);                    ui->textBrowser->append(message);                    break;                }            case NewParticipant:                {                    in >>userName >>localHostName >>ipAddress;                    newParticipant(userName,localHostName,ipAddress);                    break;                }            case ParticipantLeft:                {                    in >>userName >>localHostName;                    participantLeft(userName,localHostName,time);                    break;                }        case FileName:            {                in >>userName >>localHostName >> ipAddress;                QString clientAddress,fileName;                in >> clientAddress >> fileName;                hasPendingFile(userName,ipAddress,clientAddress,fileName);                break;            }        case Refuse:            {                in >> userName >> localHostName;                QString serverAddress;                in >> serverAddress;                            QString ipAddress = getIP();                if(ipAddress == serverAddress)                {                    server->refused();                }                break;            }        case Xchat:            {                in >>userName >>localHostName >>ipAddress;                showxchat(localHostName,ipAddress);//显示与主机名聊天中，不是用户名                break;            }        }    }}//处理新用户加入void Widget::newParticipant(QString userName,QString localHostName,QString ipAddress){    bool bb = ui->tableWidget->findItems(localHostName,Qt::MatchExactly).isEmpty();    if(bb)    {        QTableWidgetItem *user = new QTableWidgetItem(userName);        QTableWidgetItem *host = new QTableWidgetItem(localHostName);        QTableWidgetItem *ip = new QTableWidgetItem(ipAddress);        ui->tableWidget->insertRow(0);        ui->tableWidget->setItem(0,0,user);        ui->tableWidget->setItem(0,1,host);        ui->tableWidget->setItem(0,2,ip);        ui->textBrowser->setTextColor(Qt::gray);        ui->textBrowser->setCurrentFont(QFont("Times New Roman",10));        ui->textBrowser->append(tr("%1 在线！").arg(localHostName));        ui->onlineUser->setText(tr("在线人数：%1").arg(ui->tableWidget->rowCount()));        sendMessage(NewParticipant);    }}//处理用户离开void Widget::participantLeft(QString userName,QString localHostName,QString time){    int rowNum = ui->tableWidget->findItems(localHostName,Qt::MatchExactly).first()->row();    ui->tableWidget->removeRow(rowNum);    ui->textBrowser->setTextColor(Qt::gray);    ui->textBrowser->setCurrentFont(QFont("Times New Roman",10));    ui->textBrowser->append(tr("%1 于 %2 离开！").arg(localHostName).arg(time));    ui->onlineUser->setText(tr("在线人数：%1").arg(ui->tableWidget->rowCount()));}Widget::~Widget(){    delete ui;//    delete privatechat;//    privatechat = NULL;    //udpSocket    //server}void Widget::changeEvent(QEvent *e){    QWidget::changeEvent(e);    switch (e->type()) {    case QEvent::LanguageChange:        ui->retranslateUi(this);        break;    default:        break;    }}QString Widget::getIP()  //获取ip地址{    QList<QHostAddress> list = QNetworkInterface::allAddresses();    foreach (QHostAddress address, list)    {       if(address.protocol() == QAbstractSocket::IPv4Protocol) //我们使用IPv4地址            return address.toString();    }       return 0;}void Widget::sendMessage(MessageType type, QString serverAddress)  //发送信息{    QByteArray data;    QDataStream out(&data,QIODevice::WriteOnly);    QString localHostName = QHostInfo::localHostName();    QString address = getIP();    out << type << getUserName() << localHostName;    switch(type)    {        case ParticipantLeft:            {                break;            }        case NewParticipant:            {                         out << address;                break;            }        case Message :            {                if(ui->textEdit->toPlainText() == "")                {                    QMessageBox::warning(0,tr("警告"),tr("发送内容不能为空"),QMessageBox::Ok);                    return;                }               out << address << getMessage();               ui->textBrowser->verticalScrollBar()->setValue(ui->textBrowser->verticalScrollBar()->maximum());               break;            }        case FileName:            {                int row = ui->tableWidget->currentRow();                QString clientAddress = ui->tableWidget->item(row,2)->text();                out << address << clientAddress << fileName;                break;            }        case Refuse:            {                out << serverAddress;                break;            }    }    udpSocket->writeDatagram(data,data.length(),QHostAddress::Broadcast, port);}QString Widget::getUserName()  //获取用户名{    QStringList envVariables;    envVariables << "USERNAME.*" << "USER.*" << "USERDOMAIN.*"                 << "HOSTNAME.*" << "DOMAINNAME.*";    QStringList environment = QProcess::systemEnvironment();    foreach (QString string, envVariables)    {        int index = environment.indexOf(QRegExp(string));        if (index != -1)        {            QStringList stringList = environment.at(index).split('=');            if (stringList.size() == 2)            {                return stringList.at(1);                break;            }        }    }    return false;}QString Widget::getMessage()  //获得要发送的信息{    QString msg = ui->textEdit->toHtml();    ui->textEdit->clear();    ui->textEdit->setFocus();    return msg;}void Widget::closeEvent(QCloseEvent *){    sendMessage(ParticipantLeft);}void Widget::sentFileName(QString fileName){    this->fileName = fileName;    sendMessage(FileName);}void Widget::hasPendingFile(QString userName,QString serverAddress,  //接收文件                            QString clientAddress,QString fileName){    QString ipAddress = getIP();    if(ipAddress == clientAddress)    {        int btn = QMessageBox::information(this,tr("接受文件"),                                 tr("来自%1(%2)的文件：%3,是否接收？")                                 .arg(userName).arg(serverAddress).arg(fileName),                                 QMessageBox::Yes,QMessageBox::No);        if(btn == QMessageBox::Yes)        {            QString name = QFileDialog::getSaveFileName(0,tr("保存文件"),fileName);            if(!name.isEmpty())            {                TcpClient *client = new TcpClient(this);                client->setFileName(name);                client->setHostAddress(QHostAddress(serverAddress));                client->show();            }        }        else{            sendMessage(Refuse,serverAddress);        }    }}void Widget::on_send_clicked()//发送{    sendMessage(Message);}void Widget::on_sendfile_clicked(){    if(ui->tableWidget->selectedItems().isEmpty())    {        QMessageBox::warning(0,tr("选择用户"),tr("请先从用户列表选择要传送的用户！"),QMessageBox::Ok);        return;    }    server->show();    server->initServer();}void Widget::on_close_clicked()//关闭{    this->close();}bool Widget::eventFilter(QObject *target, QEvent *event){    if(target == ui->textEdit)    {        if(event->type() == QEvent::KeyPress)//回车键        {             QKeyEvent *k = static_cast<QKeyEvent *>(event);             if(k->key() == Qt::Key_Return)             {                 on_send_clicked();                 return true;             }        }    }    return QWidget::eventFilter(target,event);}void Widget::on_fontComboBox_currentFontChanged(QFont f)//字体设置{    ui->textEdit->setCurrentFont(f);    ui->textEdit->setFocus();}//字体大小设置void Widget::on_fontsizecomboBox_currentIndexChanged(QString size){   ui->textEdit->setFontPointSize(size.toDouble());   ui->textEdit->setFocus();}void Widget::on_textbold_clicked(bool checked){    if(checked)        ui->textEdit->setFontWeight(QFont::Bold);    else        ui->textEdit->setFontWeight(QFont::Normal);    ui->textEdit->setFocus();}void Widget::on_textitalic_clicked(bool checked){    ui->textEdit->setFontItalic(checked);    ui->textEdit->setFocus();}void Widget::on_textUnderline_clicked(bool checked){    ui->textEdit->setFontUnderline(checked);    ui->textEdit->setFocus();}void Widget::on_textcolor_clicked(){    color = QColorDialog::getColor(color,this);    if(color.isValid())    {        ui->textEdit->setTextColor(color);        ui->textEdit->setFocus();    }}void Widget::on_save_clicked()//保存聊天记录{    if(ui->textBrowser->document()->isEmpty())        QMessageBox::warning(0,tr("警告"),tr("聊天记录为空，无法保存！"),QMessageBox::Ok);    else    {       //获得文件名,注意getSaveFileName函数的格式即可       QString fileName = QFileDialog::getSaveFileName(this,tr("保存聊天记录"),tr("聊天记录"),tr("文本(*.txt);;All File(*.*)"));       if(!fileName.isEmpty())           saveFile(fileName);    }}bool Widget::saveFile(const QString &fileName)//保存文件{    QFile file(fileName);    if(!file.open(QFile::WriteOnly | QFile::Text))    {        QMessageBox::warning(this,tr("保存文件"),        tr("无法保存文件 %1:\n %2").arg(fileName)        .arg(file.errorString()));        return false;    }    QTextStream out(&file);    out << ui->textBrowser->toPlainText();    return true;}void Widget::on_clear_clicked()//清空聊天记录{    ui->textBrowser->clear();}void Widget::on_tableWidget_doubleClicked(QModelIndex index){    if(ui->tableWidget->item(index.row(),0)->text() == getUserName() &&        ui->tableWidget->item(index.row(),2)->text() == getIP())    {        QMessageBox::warning(0,tr("警告"),tr("你不可以跟自己聊天！！！"),QMessageBox::Ok);    }    else    {    //    else        if(!privatechat){      //  chat *privatechatTemp;        privatechat = new chat(ui->tableWidget->item(index.row(),1)->text(), //接收主机名                               ui->tableWidget->item(index.row(),2)->text()) ;//接收用户IP        }//        if( privatechat->is_opened )delete privatechat;//如果其曾经显示过则删除掉        QByteArray data;        QDataStream out(&data,QIODevice::WriteOnly);        QString localHostName = QHostInfo::localHostName();        QString address = getIP();        out << Xchat << getUserName() << localHostName << address;        udpSocket->writeDatagram(data,data.length(),QHostAddress::QHostAddress(ui->tableWidget->item(index.row(),2)->text()), port);//        privatechat->xchat->writeDatagram(data,data.length(),QHostAddress::QHostAddress(ui->tableWidget->item(index.row(),2)->text()), 45456);      //  if(!privatechat->is_opened)            privatechat->show();        privatechat->is_opened = true;    //    (privatechat->a) = 0;    }}void Widget::showxchat(QString name, QString ip){//    if(!privatechat){ // chat *privatechatTemp;    if(!privatechat1)    privatechat1 = new chat(name,ip);//    privatechat = privatechatTemp;}//    chat privatechat(name,ip);//如果不用new函数，则程序运行时只是闪烁显示一下就没了，因为类的生命周期结束了//    privatechat->is_opened = false; // privatechat->show();  //privatechat.textBrowser.show();  //privatechat->is_opened = true;    bb++;    //delete privatechat;}

 

tcpclient.h:

#ifndef TCPCLIENT_H#define TCPCLIENT_H#include <QDialog>#include <QTcpSocket>#include <QHostAddress>#include <QFile>#include <QTime>namespace Ui {    class TcpClient;}class TcpClient : public QDialog{    Q_OBJECTpublic:    explicit TcpClient(QWidget *parent = 0);    ~TcpClient();    void setHostAddress(QHostAddress address);    void setFileName(QString fileName){localFile = new QFile(fileName);}protected:    void changeEvent(QEvent *e);private:    Ui::TcpClient *ui;    QTcpSocket *tcpClient;    quint16 blockSize;    QHostAddress hostAddress;    qint16 tcpPort;    qint64 TotalBytes;    qint64 bytesReceived;    qint64 bytesToReceive;    qint64 fileNameSize;    QString fileName;    QFile *localFile;    QByteArray inBlock;    QTime time;private slots:    void on_tcpClientCancleBtn_clicked();    void on_tcpClientCloseBtn_clicked();    void newConnect();    void readMessage();    void displayError(QAbstractSocket::SocketError);};#endif // TCPCLIENT_H

 

tcpclient.cpp:

　

#include "tcpserver.h"#include "ui_tcpserver.h"#include <QTcpSocket>#include <QFileDialog>#include <QMessageBox>TcpServer::TcpServer(QWidget *parent):QDialog(parent), ui(new Ui::TcpServer){    ui->setupUi(this);    this->setFixedSize(350,180);    tcpPort = 6666;    tcpServer = new QTcpServer(this);      connect(tcpServer,SIGNAL(newConnection()),this,SLOT(sendMessage()));    initServer();}TcpServer::~TcpServer(){    delete ui;}void TcpServer::changeEvent(QEvent *e){    QDialog::changeEvent(e);    switch (e->type()) {    case QEvent::LanguageChange:        ui->retranslateUi(this);        break;    default:        break;    }}void TcpServer::sendMessage()  //开始发送数据{    ui->serverSendBtn->setEnabled(false);    clientConnection = tcpServer->nextPendingConnection();    connect(clientConnection,SIGNAL(bytesWritten(qint64)),SLOT(updateClientProgress(qint64)));    ui->serverStatusLabel->setText(tr("开始传送文件 %1 ！").arg(theFileName));    localFile = new QFile(fileName);    if(!localFile->open((QFile::ReadOnly))){//以只读方式打开        QMessageBox::warning(this,tr("应用程序"),tr("无法读取文件 %1:\n%2").arg(fileName).arg(localFile->errorString()));        return;    }    TotalBytes = localFile->size();    QDataStream sendOut(&outBlock,QIODevice::WriteOnly);    sendOut.setVersion(QDataStream::Qt_4_6);    time.start();  //开始计时    QString currentFile = fileName.right(fileName.size() - fileName.lastIndexOf('/')-1);    sendOut<<qint64(0)<<qint64(0)<<currentFile;    TotalBytes += outBlock.size();    sendOut.device()->seek(0);    sendOut<<TotalBytes<<qint64((outBlock.size()-sizeof(qint64)*2));    bytesToWrite = TotalBytes - clientConnection->write(outBlock);    qDebug()<<currentFile<<TotalBytes;    outBlock.resize(0);}void TcpServer::updateClientProgress(qint64 numBytes)//更新进度条{    bytesWritten += (int)numBytes;    if(bytesToWrite > 0){        outBlock = localFile->read(qMin(bytesToWrite,loadSize));        bytesToWrite -= (int)clientConnection->write(outBlock);        outBlock.resize(0);    }    else{        localFile->close();    }    ui->progressBar->setMaximum(TotalBytes);    ui->progressBar->setValue(bytesWritten);   float useTime = time.elapsed();   double speed = bytesWritten / useTime;   ui->serverStatusLabel->setText(tr("已发送 %1MB (%2MB/s) \n共%3MB 已用时:%4秒\n估计剩余时间：%5秒")                                  .arg(bytesWritten / (1024*1024))//已发送                                  .arg(speed*1000/(1024*1024),0,'f',2)//速度                                  .arg(TotalBytes / (1024 * 1024))//总大小                                  .arg(useTime/1000,0,'f',0)//用时                                  .arg(TotalBytes/speed/1000 - useTime/1000,0,'f',0));//剩余时间   //num.sprintf("%.1f KB/s", (bytesWritten*1000) / (1024.0*time.elapsed()));    if(bytesWritten == TotalBytes)        ui->serverStatusLabel->setText(tr("传送文件 %1 成功").arg(theFileName));}void TcpServer::on_serverOpenBtn_clicked()  //打开{    fileName = QFileDialog::getOpenFileName(this);    if(!fileName.isEmpty())    {        theFileName = fileName.right(fileName.size() - fileName.lastIndexOf('/')-1);        ui->serverStatusLabel->setText(tr("要传送的文件为：%1 ").arg(theFileName));        ui->serverSendBtn->setEnabled(true);        ui->serverOpenBtn->setEnabled(false);    }}void TcpServer::refused()   //被对方拒绝{    tcpServer->close();    ui->serverStatusLabel->setText(tr("对方拒绝接收！！！"));}void TcpServer::on_serverSendBtn_clicked()  //发送{    if(!tcpServer->listen(QHostAddress::Any,tcpPort))//开始监听    {        qDebug() << tcpServer->errorString();        close();        return;    }    ui->serverStatusLabel->setText(tr("等待对方接收... ..."));    emit sendFileName(theFileName);}void TcpServer::on_serverCloseBtn_clicked()//退出{       if(tcpServer->isListening())    {        tcpServer->close();        clientConnection->abort();    }    this->close();}void TcpServer::initServer()//初始化{    loadSize = 4*1024;    TotalBytes = 0;    bytesWritten = 0;    bytesToWrite = 0;    ui->serverStatusLabel->setText(tr("请选择要传送的文件"));    ui->progressBar->reset();    ui->serverOpenBtn->setEnabled(true);    ui->serverSendBtn->setEnabled(false);    tcpServer->close();}

 

tcpserver.h:

#ifndef TCPSERVER_H#define TCPSERVER_H#include <QDialog>#include <QTcpServer>#include <QFile>#include <QTime>namespace Ui {    class TcpServer;}class TcpServer : public QDialog{    Q_OBJECTpublic:    explicit TcpServer(QWidget *parent = 0);    ~TcpServer();    void refused();    void initServer();protected:    void changeEvent(QEvent *e);private:    Ui::TcpServer *ui;    qint16 tcpPort;    QTcpServer *tcpServer;    QString fileName;    QString theFileName;    QFile *localFile;    qint64 TotalBytes;    qint64 bytesWritten;    qint64 bytesToWrite;    qint64 loadSize;    QByteArray outBlock;//缓存一次发送的数据    QTcpSocket *clientConnection;    QTime time;//计时器private slots:    void on_serverSendBtn_clicked();    void on_serverCloseBtn_clicked();    void on_serverOpenBtn_clicked();    void sendMessage();   void updateClientProgress(qint64 numBytes);signals:    void sendFileName(QString fileName);};#endif // TCPSERVER_H

 

tcpserver.cpp:

　

#include "tcpserver.h"#include "ui_tcpserver.h"#include <QTcpSocket>#include <QFileDialog>#include <QMessageBox>TcpServer::TcpServer(QWidget *parent):QDialog(parent), ui(new Ui::TcpServer){    ui->setupUi(this);    this->setFixedSize(350,180);    tcpPort = 6666;    tcpServer = new QTcpServer(this);      connect(tcpServer,SIGNAL(newConnection()),this,SLOT(sendMessage()));    initServer();}TcpServer::~TcpServer(){    delete ui;}void TcpServer::changeEvent(QEvent *e){    QDialog::changeEvent(e);    switch (e->type()) {    case QEvent::LanguageChange:        ui->retranslateUi(this);        break;    default:        break;    }}void TcpServer::sendMessage()  //开始发送数据{    ui->serverSendBtn->setEnabled(false);    clientConnection = tcpServer->nextPendingConnection();    connect(clientConnection,SIGNAL(bytesWritten(qint64)),SLOT(updateClientProgress(qint64)));    ui->serverStatusLabel->setText(tr("开始传送文件 %1 ！").arg(theFileName));    localFile = new QFile(fileName);    if(!localFile->open((QFile::ReadOnly))){//以只读方式打开        QMessageBox::warning(this,tr("应用程序"),tr("无法读取文件 %1:\n%2").arg(fileName).arg(localFile->errorString()));        return;    }    TotalBytes = localFile->size();    QDataStream sendOut(&outBlock,QIODevice::WriteOnly);    sendOut.setVersion(QDataStream::Qt_4_6);    time.start();  //开始计时    QString currentFile = fileName.right(fileName.size() - fileName.lastIndexOf('/')-1);    sendOut<<qint64(0)<<qint64(0)<<currentFile;    TotalBytes += outBlock.size();    sendOut.device()->seek(0);    sendOut<<TotalBytes<<qint64((outBlock.size()-sizeof(qint64)*2));    bytesToWrite = TotalBytes - clientConnection->write(outBlock);    qDebug()<<currentFile<<TotalBytes;    outBlock.resize(0);}void TcpServer::updateClientProgress(qint64 numBytes)//更新进度条{    bytesWritten += (int)numBytes;    if(bytesToWrite > 0){        outBlock = localFile->read(qMin(bytesToWrite,loadSize));        bytesToWrite -= (int)clientConnection->write(outBlock);        outBlock.resize(0);    }    else{        localFile->close();    }    ui->progressBar->setMaximum(TotalBytes);    ui->progressBar->setValue(bytesWritten);   float useTime = time.elapsed();   double speed = bytesWritten / useTime;   ui->serverStatusLabel->setText(tr("已发送 %1MB (%2MB/s) \n共%3MB 已用时:%4秒\n估计剩余时间：%5秒")                                  .arg(bytesWritten / (1024*1024))//已发送                                  .arg(speed*1000/(1024*1024),0,'f',2)//速度                                  .arg(TotalBytes / (1024 * 1024))//总大小                                  .arg(useTime/1000,0,'f',0)//用时                                  .arg(TotalBytes/speed/1000 - useTime/1000,0,'f',0));//剩余时间   //num.sprintf("%.1f KB/s", (bytesWritten*1000) / (1024.0*time.elapsed()));    if(bytesWritten == TotalBytes)        ui->serverStatusLabel->setText(tr("传送文件 %1 成功").arg(theFileName));}void TcpServer::on_serverOpenBtn_clicked()  //打开{    fileName = QFileDialog::getOpenFileName(this);    if(!fileName.isEmpty())    {        theFileName = fileName.right(fileName.size() - fileName.lastIndexOf('/')-1);        ui->serverStatusLabel->setText(tr("要传送的文件为：%1 ").arg(theFileName));        ui->serverSendBtn->setEnabled(true);        ui->serverOpenBtn->setEnabled(false);    }}void TcpServer::refused()   //被对方拒绝{    tcpServer->close();    ui->serverStatusLabel->setText(tr("对方拒绝接收！！！"));}void TcpServer::on_serverSendBtn_clicked()  //发送{    if(!tcpServer->listen(QHostAddress::Any,tcpPort))//开始监听    {        qDebug() << tcpServer->errorString();        close();        return;    }    ui->serverStatusLabel->setText(tr("等待对方接收... ..."));    emit sendFileName(theFileName);}void TcpServer::on_serverCloseBtn_clicked()//退出{       if(tcpServer->isListening())    {        tcpServer->close();        clientConnection->abort();    }    this->close();}void TcpServer::initServer()//初始化{    loadSize = 4*1024;    TotalBytes = 0;    bytesWritten = 0;    bytesToWrite = 0;    ui->serverStatusLabel->setText(tr("请选择要传送的文件"));    ui->progressBar->reset();    ui->serverOpenBtn->setEnabled(true);    ui->serverSendBtn->setEnabled(false);    tcpServer->close();}

 

chat.h:

#ifndef CHAT_H#define CHAT_H#include <QDialog>#include <QtNetwork>#include <QtGui>#include "tcpclient.h"#include "tcpserver.h"namespace Ui {    class chat;}enum MessageType{    Message,    NewParticipant,    ParticipantLeft,    FileName,    Refuse,    Xchat};class chat : public QDialog{    Q_OBJECTpublic:    ~chat();//    chat();    chat(QString pasvusername, QString pasvuserip);    QString xpasvuserip;    QString xpasvusername;    QUdpSocket *xchat;    qint32 xport;    void sendMessage(MessageType type,QString serverAddress="");    quint16 a;//    static  qint32 is_opened = 0;    bool is_opened;public slots:protected:    void hasPendingFile(QString userName,QString serverAddress,  //接收文件                                QString clientAddress,QString fileName);    void participantLeft(QString userName,QString localHostName,QString time);    bool eventFilter(QObject *target, QEvent *event); //事件过滤器private:    Ui::chat *ui;    TcpServer *server;    QColor color;//颜色    bool saveFile(const QString& fileName);//保存聊天记录    QString getMessage();    QString getIP();    QString getUserName();    QString message;    QString fileName;private slots:    void sentFileName(QString);    void on_sendfile_clicked();    void processPendingDatagrams();    void on_send_clicked();    void on_close_clicked();    void on_clear_clicked();    void on_save_clicked();    void on_textcolor_clicked();    void on_textUnderline_clicked(bool checked);    void on_textitalic_clicked(bool checked);    void on_textbold_clicked(bool checked);    void on_fontComboBox_currentFontChanged(QFont f);    void on_fontsizecomboBox_currentIndexChanged(QString );    void currentFormatChanged(const QTextCharFormat &format);};#endif // CHAT_H

 

chat.cpp:

#include "chat.h"#include "ui_chat.h"//chat::chat():ui(new Ui::chat)//{//    is_opened = false;//}chat::chat(QString pasvusername, QString pasvuserip) : ui(new Ui::chat){    ui->setupUi(this);    ui->textEdit->setFocusPolicy(Qt::StrongFocus);    ui->textBrowser->setFocusPolicy(Qt::NoFocus);    ui->textEdit->setFocus();    ui->textEdit->installEventFilter(this);    a = 0;    is_opened = false;//    this->is_opened = false;    xpasvusername = pasvusername;    xpasvuserip = pasvuserip;    ui->label->setText(tr("与%1聊天中   对方IP:%2").arg(xpasvusername).arg(pasvuserip));    //UDP部分    xchat = new QUdpSocket(this);    xport = 45456; //   xchat->bind(xport, QUdpSocket::ShareAddress | QUdpSocket::ReuseAddressHint);    xchat->bind( QHostAddress::QHostAddress(getIP()), xport );    connect(xchat, SIGNAL(readyRead()), this, SLOT(processPendingDatagrams()));    //TCP部分    server = new TcpServer(this);    connect(server,SIGNAL(sendFileName(QString)),this,SLOT(sentFileName(QString)));    connect(ui->textEdit,SIGNAL(currentCharFormatChanged(QTextCharFormat)),this,SLOT(currentFormatChanged(const QTextCharFormat)));}chat::~chat(){    is_opened = false;    delete ui;}bool chat::eventFilter(QObject *target, QEvent *event){    if(target == ui->textEdit)    {        if(event->type() == QEvent::KeyPress)//按下键盘某键        {             QKeyEvent *k = static_cast<QKeyEvent *>(event);             if(k->key() == Qt::Key_Return)//回车键             {                 on_send_clicked();                 return true;             }        }    }    return QWidget::eventFilter(target,event);}//处理用户离开void chat::participantLeft(QString userName,QString localHostName,QString time){    ui->textBrowser->setTextColor(Qt::gray);    ui->textBrowser->setCurrentFont(QFont("Times New Roman",10));    ui->textBrowser->append(tr("%1 于 %2 离开！").arg(userName).arg(time));}QString chat::getUserName()  //获取用户名{    QStringList envVariables;    envVariables << "USERNAME.*" << "USER.*" << "USERDOMAIN.*"                 << "HOSTNAME.*" << "DOMAINNAME.*";    QStringList environment = QProcess::systemEnvironment();    foreach (QString string, envVariables)    {        int index = environment.indexOf(QRegExp(string));        if (index != -1)        {            QStringList stringList = environment.at(index).split('=');            if (stringList.size() == 2)            {                return stringList.at(1);                break;            }        }    }    return false;}QString chat::getIP()  //获取ip地址{    QList<QHostAddress> list = QNetworkInterface::allAddresses();    foreach (QHostAddress address, list)    {       if(address.protocol() == QAbstractSocket::IPv4Protocol) //我们使用IPv4地址            return address.toString();    }       return 0;}void chat::hasPendingFile(QString userName,QString serverAddress,  //接收文件                            QString clientAddress,QString fileName){    QString ipAddress = getIP();    if(ipAddress == clientAddress)    {        int btn = QMessageBox::information(this,tr("接受文件"),                                 tr("来自%1(%2)的文件：%3,是否接收？")                                 .arg(userName).arg(serverAddress).arg(fileName),                                 QMessageBox::Yes,QMessageBox::No);        if(btn == QMessageBox::Yes)        {            QString name = QFileDialog::getSaveFileName(0,tr("保存文件"),fileName);            if(!name.isEmpty())            {                TcpClient *client = new TcpClient(this);                client->setFileName(name);                client->setHostAddress(QHostAddress(serverAddress));                client->show();            }        }        else{            sendMessage(Refuse,serverAddress);        }    }}void chat::processPendingDatagrams()   //接收数据UDP{    while(xchat->hasPendingDatagrams())    {        QByteArray datagram;        datagram.resize(xchat->pendingDatagramSize());        xchat->readDatagram(datagram.data(),datagram.size());        QDataStream in(&datagram,QIODevice::ReadOnly);        int messageType;        in >> messageType;        QString userName,localHostName,ipAddress,messagestr;        QString time = QDateTime::currentDateTime().toString("yyyy-MM-dd hh:mm:ss");        switch(messageType)        {            case Xchat:            {//                ui.show();                break;            }            case Message:                {                    //这2条语句都没有用。why？？、                    /*this->hide();                    this->close();*/                    in >>userName >>localHostName >>ipAddress >>messagestr;                    ui->textBrowser->setTextColor(Qt::blue);                    ui->textBrowser->setCurrentFont(QFont("Times New Roman",12));                    ui->textBrowser->append("[ " +localHostName+" ] "+ time);//与主机名聊天中                    ui->textBrowser->append(messagestr);            //        ui->textBrowser->show();                    //this->textBrowser->setTextColor(Qt::blue);                    //this->textBrowser->setCurrentFont(QFont("Times New Roman",12));                    //this->textBrowser->append("[ " +localHostName+" ] "+ time);//与主机名聊天中                    //this->textBrowser->append(messagestr);                        //        a ++;            //        if( is_opened == false )//加了这句，接收端B不显示端口了                    {                        this->show();////解决bug1.收到私聊消息后才显示                //        ui->textBrowser->show();                    //    this->show();                //        ui->textBrowser->show();                    //    ui.show();                    //    if( this->show() )                //        this->hide();                //        0 == a;                        is_opened = true;                    }                    break;                }        case FileName:            {                in >>userName >>localHostName >> ipAddress;                QString clientAddress,fileName;                in >> clientAddress >> fileName;                hasPendingFile(userName,ipAddress,clientAddress,fileName);                break;            }        case Refuse:            {                in >> userName >> localHostName;                QString serverAddress;                in >> serverAddress;                QString ipAddress = getIP();                if(ipAddress == serverAddress)                {                    server->refused();                }                break;            }        case ParticipantLeft:            {                in >>userName >>localHostName;                participantLeft(userName,localHostName,time);                QMessageBox::information(0,tr("本次对话关闭"),tr("对方结束了对话"),QMessageBox::Ok);                a = 1;                ui->textBrowser->clear();                //is_opened = true;            //    this->is_opened = false;                ui->~chat();                close();            //    delete ui;            //    ui = 0;                break;            }        }    }}void chat::sentFileName(QString fileName){    this->fileName = fileName;    sendMessage(FileName);}QString chat::getMessage()  //获得要发送的信息{    QString msg = ui->textEdit->toHtml();    qDebug()<<msg;    ui->textEdit->clear();    ui->textEdit->setFocus();    return msg;}//通过私聊套接字发送到对方的私聊专用端口上void chat::sendMessage(MessageType type , QString serverAddress)  //发送信息{    QByteArray data;    QDataStream out(&data,QIODevice::WriteOnly);    QString localHostName = QHostInfo::localHostName();    QString address = getIP();    out << type << getUserName() << localHostName;    switch(type)    {    case ParticipantLeft:        {            break;        }    case Message :        {            if(ui->textEdit->toPlainText() == "")            {                QMessageBox::warning(0,tr("警告"),tr("发送内容不能为空"),QMessageBox::Ok);                return;            }            message = getMessage();            out << address << message;            ui->textBrowser->verticalScrollBar()->setValue(ui->textBrowser->verticalScrollBar()->maximum());            break;        }    case FileName:            {                QString clientAddress = xpasvuserip;                out << address << clientAddress << fileName;                break;            }    case Refuse:            {                out << serverAddress;                break;            }    }    xchat->writeDatagram(data,data.length(),QHostAddress::QHostAddress(xpasvuserip), 45456);}void chat::currentFormatChanged(const QTextCharFormat &format){//当编辑器的字体格式改变时，我们让部件状态也随之改变    ui->fontComboBox->setCurrentFont(format.font());    if(format.fontPointSize()<9)  //如果字体大小出错，因为我们最小的字体为9    {        ui->fontsizecomboBox->setCurrentIndex(3); //即显示12    }    else    {        ui->fontsizecomboBox->setCurrentIndex(ui->fontsizecomboBox->findText(QString::number(format.fontPointSize())));    }    ui->textbold->setChecked(format.font().bold());    ui->textitalic->setChecked(format.font().italic());    ui->textUnderline->setChecked(format.font().underline());    color = format.foreground().color();}void chat::on_fontComboBox_currentFontChanged(QFont f)//字体设置{    ui->textEdit->setCurrentFont(f);    ui->textEdit->setFocus();}void chat::on_fontsizecomboBox_currentIndexChanged(QString size){   ui->textEdit->setFontPointSize(size.toDouble());   ui->textEdit->setFocus();}void chat::on_textbold_clicked(bool checked){    if(checked)        ui->textEdit->setFontWeight(QFont::Bold);    else        ui->textEdit->setFontWeight(QFont::Normal);    ui->textEdit->setFocus();}void chat::on_textitalic_clicked(bool checked){    ui->textEdit->setFontItalic(checked);    ui->textEdit->setFocus();}void chat::on_save_clicked()//保存聊天记录{    if(ui->textBrowser->document()->isEmpty())        QMessageBox::warning(0,tr("警告"),tr("聊天记录为空，无法保存！"),QMessageBox::Ok);    else    {       //获得文件名       QString fileName = QFileDialog::getSaveFileName(this,tr("保存聊天记录"),tr("聊天记录"),tr("文本(*.txt);;All File(*.*)"));       if(!fileName.isEmpty())           saveFile(fileName);    }}void chat::on_clear_clicked()//清空聊天记录{    ui->textBrowser->clear();}bool chat::saveFile(const QString &fileName)//保存文件{    QFile file(fileName);    if(!file.open(QFile::WriteOnly | QFile::Text))    {        QMessageBox::warning(this,tr("保存文件"),        tr("无法保存文件 %1:\n %2").arg(fileName)        .arg(file.errorString()));        return false;    }    QTextStream out(&file);    out << ui->textBrowser->toPlainText();    return true;}void chat::on_textUnderline_clicked(bool checked){    ui->textEdit->setFontUnderline(checked);    ui->textEdit->setFocus();}void chat::on_textcolor_clicked(){    color = QColorDialog::getColor(color,this);    if(color.isValid())    {        ui->textEdit->setTextColor(color);        ui->textEdit->setFocus();    }}void chat::on_close_clicked(){    sendMessage(ParticipantLeft);    a = 1;    ui->textBrowser->clear();    //is_opened = true;//    this->is_opened = false;    close();    ui->~chat();    //this->close();    /*delete ui;    ui = 0;*/    }void chat::on_send_clicked(){    sendMessage(Message);    QString localHostName = QHostInfo::localHostName();    QString time = QDateTime::currentDateTime().toString("yyyy-MM-dd hh:mm:ss");    ui->textBrowser->setTextColor(Qt::blue);    ui->textBrowser->setCurrentFont(QFont("Times New Roman",12));    ui->textBrowser->append("[ " +localHostName+" ] "+ time);    ui->textBrowser->append(message);//    is_opened = true;}void chat::on_sendfile_clicked(){    server->show();    server->initServer();}

 

main:

#include <QtGui/QApplication>#include "widget.h"int main(int argc, char *argv[]){    QApplication a(argc, argv);    Widget w;    QTextCodec::setCodecForTr(QTextCodec::codecForLocale());    w.show();    return a.exec();}