5 关于QT中的网络编程，QTcpSocket，QUdpSocket

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1新建一个项目：TCPServer.pro

A 修改TCPServer.pro,注意：如果是想使用网络库，需要加上network

SOURCES+=\    TcpServer.cpp\    TcpClient.cpp   HEADERS+=\    TcpServer.h\    TcpClient.h   QT+=gui widgets network   CONFIG+=C++11

B新建如下文件，因为要用到网络库，所以加上network

C编写IP选择下拉选，头文件ChooseInterface.h

#ifndefCHOOSEINTERFACE_H #defineCHOOSEINTERFACE_H   #include #include   classChooseInterface:publicQDialog {    Q_OBJECT public:    explicitChooseInterface(QWidget*parent= 0);    QComboBox*_comboBox;    QString_strSelect;   signals:   publicslots:    voidslotComboBoxChange(QString); };   #endif//CHOOSEINTERFACE_H

编写ChooseInterface.cpp

#include"ChooseInterface.h" #include #include   ChooseInterface::ChooseInterface(QWidget*parent):    QDialog(parent) {    /*getallinterface*/    QList<QHostAddress>addrList=QNetworkInterface::allAddresses(); #if0    QList<QNetworkInterface>infList =QNetworkInterface::allInterfaces();      QList<QNetworkAddressEntry>entryList =infList.at(0).addressEntries();    entryList.at(0).broadcast() #endif      //编写一个下拉选    _comboBox=newQComboBox;    QVBoxLayout*lay=newQVBoxLayout(this);    lay->addWidget(_comboBox);      foreach(QHostAddressaddr,addrList)    {        //将地址都转换成为ipv4的地址        quint32ipaddr=addr.toIPv4Address();        //去掉0的ip        if(ipaddr==0)            continue;        //在comboBox中添加下拉选        _comboBox->addItem(QHostAddress(ipaddr).toString());    }      //当下拉选发生变化时的操作    connect(_comboBox,SIGNAL(currentIndexChanged(QString)),            this,SLOT(slotComboBoxChange(QString))); }   voidChooseInterface::slotComboBoxChange(QStringstr) {    this->_strSelect=str; }

上面的运行结果是：

编写TcpServer.h

#ifndefTCPSERVER_H #defineTCPSERVER_H   #include #include #include #include   classTcpServer:publicQWidget {    Q_OBJECT public:    explicitTcpServer(QWidget*parent= 0);      QTcpServer*_server;    QTcpSocket*_socket;      QTextBrowser*_show;   signals:   publicslots:    voidslotNetConnection();    voidslotReadyRead(); };   #endif//TCPSERVER_H

编写TcpServer.cpp

#include"TcpServer.h" #include #include #include #include"ChooseInterface.h"   TcpServer::TcpServer(QWidget*parent):    QWidget(parent) {    //创建服务器并监听    _server=newQTcpServer;      ChooseInterfacedlg;    dlg.exec();      //消息提示框    QMessageBox::information(NULL,"youselecttheip:",dlg._strSelect);      _server->listen(QHostAddress(dlg._strSelect),9988);      //当有客户端来连接时，调用slotNetConnection方法    connect(_server,SIGNAL(newConnection()),            this,SLOT(slotNetConnection()));      _show=newQTextBrowser;    QHBoxLayout*lay=newQHBoxLayout(this);    lay->addWidget(_show); }   voidTcpServer::slotNetConnection() {    //判断是否有未处理的连接    while(_server->hasPendingConnections())    {        //调用nextPeddingConnection去获得连接的socket        _socket=_server->nextPendingConnection();          _show->append("Newconnection....");          //为新的socket提供槽函数，来接收数据        connect(_socket,SIGNAL(readyRead()),                this,SLOT(slotReadyRead()));    } }   voidTcpServer::slotReadyRead() {    //接收数据，判断是否有数据，如果有，通过readAll函数获取所有数据    while(_socket->bytesAvailable()>0)    {        _show->append("Dataarrived.....");        QByteArraybuf=_socket->readAll();        _show->append(buf);    } }

编写TcpClient.h

#ifndefTCPCLIENT_H #defineTCPCLIENT_H   #include #include #include   classTcpClient:publicQWidget {    Q_OBJECT public:    explicitTcpClient(QWidget*parent= 0);    QTcpSocket*_socket;    QLineEdit*_lineEdit;   signals:   publicslots:    voidslotButtonClick(); };   #endif//TCPCLIENT_H

编写TcpClient.cpp

#include"TcpClient.h" #include #include   TcpClient::TcpClient(QWidget*parent):    QWidget(parent) {    _socket=newQTcpSocket(this);    _socket->connectToHost("127.0.0.1",9988);      _lineEdit=newQLineEdit;    QHBoxLayout*lay=newQHBoxLayout(this