server to client send data

[ELIF]

I have two QT projects.One of them is for client other is for server.I add +network both

pro files.I want to write something server to client.So I decided to write from server side , read from client side.

In CLIENT SIDE constructor I have

Client::Client()
{
    tcpSocket = new QTcpSocket();
    tcpSocket->connectToHost(QHostAddress::LocalHost,45442);//Connection is OK
connect(tcpSocket,&QTcpSocket::readyRead, this, &Client::readyRead);//Not working
}

In CLIENT SIDE readyRead()

void Client::readyRead(){
    qDebug() << "///READYREAD SLOT///";
    qDebug() << tcpSocket->readAll();
}

In server side header file I have

QTcpSocket *clientConnection;

IN SERVER SIDE I HAVE :TimerSlot()

void MainWindow::TimerSlot(){//
   clientConnection->write(QByteArray::fromStdString("ABCDEFFGHJKL"));
}

IN SERVER SIDE CONSTRUCTOR

MainWindow::MainWindow (QWidget *parent) : QMainWindow(parent), ui(new Ui::MainWindow)
{
 timerTarget = new QTimer(this);
connect(timerTarget,SIGNAL(timeout()),this,SLOT(TimerSlot())); 
 timerTarget->start(700);//NOT WORKINNG All app is shutting down suddenly when I call this code line
}

So what is the problem? Where is my error?
Thank you.

[J.Hilk]

@ELIF said in server to client send data:

QTcpSocket *clientConnection

where do you new/allocate this ?

[ELIF]

@J-Hilk said in server to client send data:

clientConnection

Thank you I forget it:) Now it is working.