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1、QT之网络编程1Qt网络编程QIODeviceQAbstractSocketQFileQBufferQUdpSocketQTcpSocketQTcpServerQHostAddress类继承架构图2Qt网络编程QIODevice：是一个抽象类，为Qt中所有提供了打开、关闭、读写的等IO操作方法的类提供一个统一的接口，Qt中具备其接口的类包括QFile、QAbstractSocket、QTcpSocket、QUdpSocket、QBuffer、Qprocess等。操作函数：open(),close()read(),readAll(),read
2、Line()write()Signal：voidaboutToClose()voidbytesWritten(qint64bytes)voidreadChannelFinished()voidreadyRead()判断函数：boolatEnd()constqint64bytesAvailable()constqint64bytesToWrite()constboolcanReadLine()const同步操作函数：boolwaitForBytesWritten(intmsecs)boolwaitForReadyRead(intmsecs)3
3、Qt网络编程QAbstractSocket是一个抽象类，在QIODevice基础上，为socket提供了公共的接口。操作函数：QAbstractSocket(SocketTypesocketType,QObject*parent)voidconnectToHost(constQHostAddress&address,quint16port,OpenModeopenMode=ReadWrite)voiddisconnectFromHost()信息提取函数：QHostAddresslocalAddress()constquint16localP
4、ort()constQHostAddresspeerAddress()constquint16peerPort()constSocketStatestate()constSignal：voidstateChanged(QAbstractSocket::SocketStatesocketState)同步操作函数：boolwaitForConnected(intmsecs=30000)boolwaitForDisconnected(intmsecs=30000)4Qt网络编程QTcpSocket继承自QAbstractSocket，没有增加接口
5、。QUdpSocket继承自QAbstractSocket，增加了以下UDP特有的接口操作函数：boolbind(constQHostAddress&address,quint16port,BindModemode)qint64readDatagram(char*data,qint64maxSize,QHostAddress*address=0,quint16*port=0)qint64writeDatagram(constchar*data,qint64size,constQHostAddress&address,quint16port)
6、qint64writeDatagram(constQByteArray&datagram,constQHostAddress&host,quint16port)判断函数：boolhasPendingDatagrams()constqint64pendingDatagramSize()const5Qt网络编程QTcpServer提供了TCP监听socket功能。操作函数：boollisten(constQHostAddress&address=QHostAddress::Any,quint16port=0)setMaxPendingConne
7、ctions(intnumConnections)QTcpSocket*nextPendingConnection()判断函数：boolhasPendingConnections()constboolisListening()const信息提取函数：QHostAddressserverAddress()constquint16serverPort()constSignal：voidnewConnection()同步函数：boolwaitForNewConnection(intmsec=0,bool*timedOut=0)6Qt网络编程QHo
8、stAddress代表IP地址信息，并提供了IP地址和IP字符串相互转换的方法例如：QHostAddress::Any;QHostAddressip;ip.setAddress(
