Problem in client - server model of tcp in qt

shakthi

hi,

i like to implement simple client -server model of qt. but unfortunately i dint get proper output. its totally runtime error. please help me to find out..

here my server code which will receive the output once connected with client :

code:

@
#include "widget.h"
#include "ui_widget.h"
#include "QtNetwork/qabstractsocket.h"
#include "QtNetwork/qtcpserver.h"
#include "QtNetwork/qtcpsocket.h"
#include "QtNetwork/QHostAddress"
#include "QMessageBox"
#include "QDebug"
#include "QDataStream"
#include "stdio.h"
Widget::Widget(QWidget *parent) :
QWidget(parent),
ui(new Ui::Widget)
{
ui->setupUi(this);
int s;
serversocket=new QTcpServer();

client=new QTcpSocket();
serversocket->listen(QHostAddress::Any,5639);

QObject::connect(serversocket,SIGNAL(newConnection()),this,SLOT(memberofserver()));

}

Widget::~Widget()
{
delete ui;
}

void Widget::memberofserver()
{

    QTcpSocket *client = serversocket->nextPendingConnection();
    QObject::connect(client,SIGNAL(disconnected()),client,SLOT(deleteLater()));
    QDataStream in(client);
    in.setVersion(QDataStream::Qt_4_0);
    QString data;
    in >> data;
    ui->text1->setText(data);

}
@

here my client code which will send data to server once it got connected :

Code :

@
#include "widget.h"
#include "ui_widget.h"
#include "QMessageBox"
#include "QAbstractSocket"
#include "QTcpSocket"

Widget::Widget(QWidget *parent) :
QWidget(parent),
ui(new Ui::Widget)
{

ui->setupUi(this);

client1=new QTcpSocket(this);
client1->connectToHost("ipaddr...",5639);
if(client1->state()==QAbstractSocket::ConnectedState)
    QMessageBox::information(this,tr("client"),tr("successfullyconnected"));
else
    QMessageBox::information(this,tr("server"),tr("unsuccessfulcompletion"));

       client1->write("heysuper",20);

}

Widget::~Widget()
{
delete ui;
}
@

please help me to find out soon

thanks in advance,
shakthi

EDIT: please use @-tags for code highlight, Gerolf

koahnig

Did you try to use the "fortune server / client example ":http://doc.qt.nokia.com/4.7/network-fortuneserver.html
This may provide a better understanding for you how to do the server / client applications.

BTW: You should start the code section with '@' and close it with the character. Otherwise it looks a bit messy.

"Here is some helpful explanation on writing and formatting posts":http://developer.qt.nokia.com/wiki/ForumHelp

shakthi

hi thanks for your reply.. i ve verified fortune server.. but pls tell me the error of my code.. sorry for the unformatted code..
expecting reply from u?

thanks in advance,
shakthi

mlong

In your code the connection state is queried immediately after the call to connectToHost() is made, which more than likely doesn't give the connection time to complete. (It's not a blocking call.)

You probably either want to call "waitForConnected()":http://doc.qt.nokia.com/4.7/qabstractsocket.html#waitForConnected or connect to the connected()/error() signals.