TcpSocket stateChanged signal is not emit

[w.tkm]

Hi.

I use Tcp in an application. (No special features.)
That application is the client, and another application is the server.

I ran the application before running the server application.
Then client application's socket was not emit [stateChanged].
However, It was able to connect to the server and send/receive data.

If the server is up and running, [stateChanged] is emit.
Why is this?

[jsulm]

@w-tkm I don't understand: if the server is not running how can your client connect and send/receive data?!

Also, what daes this mean: "I ran the application before running the server application.( after running the server application )"? Do you start client before or after server? Please explain clearly.

[w.tkm]

@jsulm sorry I didn't explain myself better. I start client before server.

[jsulm]

@w-tkm Can you show your code?

[w.tkm]

@jsulm

void CcuTcp::fnTcpClientSet(QString sTcpConnectIP, quint16 uiTcpConnectPort, QString sTcpBindIP)
{

    connect(m_pTcpSocket, SIGNAL(readyRead()), this, SLOT(fnTcpRecvData()));
    connect(m_pTcpSocket, &QAbstractSocket::stateChanged, this, &CcuTcp::fnTcpStateChanged );

    m_pTcpSocket->setProxy(QNetworkProxy::NoProxy);
    m_pTcpSocket->bind( QHostAddress( sTcpBindIP ), QAbstractSocket::DefaultForPlatform);
    m_pTcpSocket->connectToHost( sTcpConnectIP, uiTcpConnectPort );
}

void CcuTcp::fnTcpStateChanged()
{
    switch ( m_pTcpSocket->state() ) {
    case QAbstractSocket::UnconnectedState:	emit fnSocketState(TCP_STATE_UNCONNECT);	break;
    case QAbstractSocket::ConnectingState:	emit fnSocketState(TCP_STATE_CONNECTING);	break;
    case QAbstractSocket::ConnectedState:	emit fnSocketState(TCP_STATE_CONNECTED);	break;
    case QAbstractSocket::ClosingState:		emit fnSocketState(TCP_STATE_CLOSING);		break;
    default: break;
    }
}

[TCP_STATE_...] is Macro.

[jsulm]

@w-tkm said in TcpSocket stateChanged signal is not emit:

case QAbstractSocket::UnconnectedState: emit fnSocketState(TCP_STATE_UNCONNECT); break;
case QAbstractSocket::ConnectingState: emit fnSocketState(TCP_STATE_CONNECTING); break;
case QAbstractSocket::ConnectedState: emit fnSocketState(TCP_STATE_CONNECTED); break;
case QAbstractSocket::ClosingState:

There are more states which you do not cover

[w.tkm]

@jsulm Its status is not described because it is not particularly necessary.
I try

qDebug() << m_pTcpSocket->state().

in fnTcpStateChanged().but, console don't show debug string