fragmentation error when using Qtcpsocket write

ali910

hello
i write a application that connects to server throw Qtcp socket.
this program works well```

but in send message method, fragmentation error cures.
thanks for your help.

TcpClient::TcpClient(QObject *parent) : QObject(parent)
{
socket = new QTcpSocket();
qDebug()<<socket;
}

bool TcpClient::connectClient(QString ip, quint16 port)
{

      connect(socket, SIGNAL(disconnected()), this, SLOT(disconnected()));
      connect(socket, SIGNAL(readyRead()), this, SLOT(readReady()));
        qDebug() << "Connecting,..";
        socket->connectToHost(ip, port);
        qDebug()<<"connected";
        qDebug()<<socket;
        return socket->waitForConnected();
}

void TcpClient::sendMessage(QString message)
{
    //sending message to server
     if(socket->state() == QAbstractSocket::ConnectedState)
         {
         qDebug()<<socket;
    socket->write(message.toUtf8());
     }

}


void TcpClient::readReady()

{

    QByteArray data = socket->readAll();
    QString str(data);
    str=emit manageRequest(str);
    if(str!=""){
        socket->write(str.toUtf8());
    }


}

void TcpClient::disconnected()
{
qDebug() << "disconnected " ;
}

Christian Ehrlicher

@ali910 said in fragmentation error when using Qtcpsocket write:

fragmentation error cures.

What does this mean?

SGaist

Hi and welcome to devnet,

From the looks of it you are expecting your client to receive all the data you sent in one go. That's not how tcp works. It's up to you cumulate the data you receive contains a full frame.

You can use QDataStream and transactions.