QTcpSocket and QTcpServer

["Marius Roets"]

Hi all,

I have used QTcpSocket and QTcpServer to implement a custom client
server, in which the client can remotely control certain functions on
the server. Everything seems to be working well, but I have issue when
writes to the socket occurs too close together. Only the first write
goes through.

For communication I have created a class called SocketProtocol that
takes care of the protocol. It has a write() method. Simplified it
would look something like this :
void SocketProtocol::write(const QString& string)
{

   QByteArray block;
   QDataStream out(&block, QIODevice::WriteOnly);
   out.setVersion(QDataStream::Qt_4_0);
   out << (quint16)0;
   out << string;
   out.device()->seek(0);
   out << (quint16)(block.size() - sizeof(quint16));

   m_socket->write(block); // m_socket is a pointer to a QTcpSocket instance
   m_socket->flush();
}

If I now instantiate and use the protocol :
SocketProtocol *p = new SocketProtocol;
p->write("Test 1");
p->write("Test 2");

// Only Test 1 is received (very infrequently, both are received).

Putting a sleep between the writes have no effect. However, if I
trigger them via QTimer::singleShot() it seems to work.

Any ideas what I might be doing wrong.


Thanks
Marius

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