QTcpSocket

QTcpSocket :: QAbstractSocket

信号：

• readyread()

• error()

•  QObject::connect(clientConnection->tcpSocket, SIGNAL(error(QAbstractSocket::SocketError)),
   this, SLOT(displayError(QAbstractSocket::SocketError)));

abort()

state() == QAbstractSocket::ConnectedState

flush()

connectToHost()

write()

QByteArray readAll()

waitForConnected(time)