How to send messages to connected clients from server in Qt - qt

Question

I know that how to send messages to the newly connected client whenever the QTcpServer newConnection is emitted. What I did is like this:
connect(serverConnection.tcpServer, &QTcpServer::newConnection, this, &ServerInterface::sendMessages);
void ServerInterface::sendMessages()
{
QByteArray messagesToClients;
QDataStream out(&messagesToClients, QIODevice::WriteOnly);
QTcpSocket *clientConnection = serverConnection.tcpServer->nextPendingConnection();
out << inputBox->toPlainText(); //get text from QTextEdit
clientConnection->write(messagesToClients);
}
But what I want to do is whenever the send messages button is clicked in the server, it will send messages to currently connected clients. The code I provide can only send only one new message to the newly connected client. I have no idea of how to achieve what I want to do, so can someone provide me a way to do that? I am kind of new to Qt networking.
Thanks.

Answer 1

Just store your connections in container. Like this:
in your ServerInterface h-file:
class ServerInterface {
// your stuff
public slots:
void onClientConnected();
void onClientDisconnected();
private:
QVector<QTcpSocket *> mClients;
};
in your ServerInterface cpp-file :
connect(serverConnection.tcpServer, SIGNAL(newConnection(), this, SLOT(onClientConnected());
void ServerInterface::onClientConnected() {
auto newClient = serverConnection.tcpServer->nextPendingConnection();
mClients->push_back( newClient );
connect(newClient, SIGNAL(disconnected()), this, SLOT(onClientDisconnected());
}
void ServerInterface::onClientDisconnected() {
if(auto client = dynamic_cast<QTcpSocket *>(sender()) {
mClients->removeAll(client);
}
void ServerInterface::sendMessages() {
out << inputBox->toPlainText();
for(auto &client : mClients) {
client->write(messagesToClients);
}
}