Qtcpsocket connection Problem while connecting with j2me midlet.

[hasnain]

Hi,
i am using QTcpServer and QTcpSocket for listening and establishing connection. QTcpServer accept connection and open a socket and, J2me server accept connection from my Qt app. but after that when i tried to transfer data. any incoming data is not detected on both sides any body has an idea how i can do this. both Qt and j2me app are reading/writing in UTF8 format.

newConn() is connected to the QTcpserver::newConnection signal

@void chatScreen::newConn(){
    char *data = new char();
    qDebug()<<"New Connection";
//    qDebug()<<"threads "<<threads.count()<<" Textbrowsers "<<textBrowsers.count()<<"Sockets "<<connections.count();
    uint i;
    i=1024;
//    QString name;
    QTcpSocket *client =server.nextPendingConnection();
    QByteArray block;
    QDataStream out(&block,QIODevice::WriteOnly);
    QString a=tr("(iq,") + ownUserName + tr(")");
//    out<<a.toAscii();
    client->write(a.toUtf8());
    client->flush();
    client->waitForReadyRead();
    client->readLine(data,i);
    qDebug()<<data;
}@

@void chatScreen::newConn(){
    char *data = new char();
    qDebug()<<"New Connection";
//    qDebug()<<"threads "<<threads.count()<<" Textbrowsers "<<textBrowsers.count()<<"Sockets "<<connections.count();
    uint i;
    i=1024;
//    QString name;
    QTcpSocket *client =server.nextPendingConnection();
    QByteArray block;
    QDataStream out(&block,QIODevice::WriteOnly);
    QString a=tr("(iq,") + ownUserName + tr(")");
//    out<<a.toAscii();
    client->write(a.toUtf8());
    client->flush();
    client->waitForReadyRead();
    client->readLine(data,i);
    qDebug()<<data;
}@

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connectToServer() is using to connect to server.

@void chatScreen::connectToServer(QString itemName){
//    char *data = new char();
    char *data = new char();
    uint i;
    i=1024;
    uint port;
    port = 1235;
    QString ip;
    for (int k=0;k < contactList.count();k++){
        if(contactList.at(k)->getName()== itemName){
            ip = contactList.at(k)->getIpAddress();
            break;
        }
    }
 
    QTcpSocket *client = new QTcpSocket(this);
    client->connectToHost((QHostAddress)ip,port,QIODevice::ReadWrite);
    client->waitForConnected();
    if(client->state()== QAbstractSocket::ConnectedState){
        client->waitForReadyRead();
        client->readLine(data,i);
        qDebug()<<data;
        QString datain = data;
        if(datain.startsWith(tr("(iq,"))){
            QString a = tr("(hs)(") + QString::number(ownUserId) + tr(")(" )+ ownUserName + tr(")(") + ownPhoneNumber + tr(")(") +
                        ownAlias+ tr(")(") + ownIpAddress + tr(")");
            client->write(a.toUtf8());
            client->flush();
}@

@void chatScreen::connectToServer(QString itemName){
//    char *data = new char();
    char *data = new char();
    uint i;
    i=1024;
    uint port;
    port = 1235;
    QString ip;
    for (int k=0;k < contactList.count();k++){
        if(contactList.at(k)->getName()== itemName){
            ip = contactList.at(k)->getIpAddress();
            break;
        }
    }

    QTcpSocket *client = new QTcpSocket(this);
    client->connectToHost((QHostAddress)ip,port,QIODevice::ReadWrite);
    client->waitForConnected();
    if(client->state()== QAbstractSocket::ConnectedState){
        client->waitForReadyRead();
        client->readLine(data,i);
        qDebug()<<data;
        QString datain = data;
        if(datain.startsWith(tr("(iq,"))){
            QString a = tr("(hs)(") + QString::number(ownUserId) + tr(")(" )+ ownUserName + tr(")(") + ownPhoneNumber + tr(")(") +
                        ownAlias+ tr(")(") + ownIpAddress + tr(")");
            client->write(a.toUtf8());
            client->flush();
}@

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the above code is working fine when used to communicate between two Qt apps.
--

[tbscope]

char *data = new char();

char *data = new char();

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Wrong!

qDebug()<<"threads "<<threads.count()<<

qDebug()<<"threads "<<threads.count()<<

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This doesn't predict a bright future.

QDataStream out(&block,QIODevice::WriteOnly);

QDataStream out(&block,QIODevice::WriteOnly);

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When connecting to a non Qt based server or a Qt server that doesn't use QDataStream, this does not work. A DataStream is a binary stream only readable by a program that can actually decode it.

But you don't use it.

QString a=tr("(iq,") + ownUserName + tr(")");

QString a=tr("(iq,") + ownUserName + tr(")");

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Wrong, use QString::arg and similar functions.

(QHostAddress)ip

(QHostAddress)ip

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Wrong! Undefined behaviour.
You can not cast a QString to a QHostAddress.