QtcpServer not reading accurately from all client connections.

**quickNitin** · 5th July 2006, 13:59

This is in refrence to my previous thread.
http://www.qtcentre.org/forum/f-newb...cket-2861.html

Following code shows server activating a new client connection

Qt Code:

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void tcpCock::activatingNewConnection()
{
	 tcpSocket=tcpServer->nextPendingConnection();
	connect( tcpSocket, SIGNAL(disconnected()),tcpSocket, SLOT(deleteLater()));
	connect( tcpSocket,SIGNAL(readyRead()),this,SLOT(updatePixmap()));
	//provide a connect for linking socket exiting status to one of slo which disconnects drawShape() from refresh signal.
	connect( tcpSocket,SIGNAL(disconnected()),this,SLOT(socketDisconnected()));
	//pIntQlist= new QList<int> ;
	hash.insert(tcpSocket->socketDescriptor(),new QList<int>);
}

void tcpCock::activatingNewConnection()
{
	 tcpSocket=tcpServer->nextPendingConnection();
	connect( tcpSocket, SIGNAL(disconnected()),tcpSocket, SLOT(deleteLater()));
	connect( tcpSocket,SIGNAL(readyRead()),this,SLOT(updatePixmap()));
	//provide a connect for linking socket exiting status to one of slo which disconnects drawShape() from refresh signal.
	connect( tcpSocket,SIGNAL(disconnected()),this,SLOT(socketDisconnected()));
	//pIntQlist= new QList<int> ;
	hash.insert(tcpSocket->socketDescriptor(),new QList<int>);
}

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following slot will be called when readyRead() signal is emitted by socket

Qt Code:

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void tcpCock::updatePixmap()
{
 
	QTcpSocket *tempSock=dynamic_cast<QTcpSocket *>(sender());
	if(tempSock)
	{
	cout<<"\n sock desc:"<<tempSock->socketDescriptor()<<"\t";
	QHash<int, QList<int>* >::const_iterator itr=hash.find(tempSock->socketDescriptor());
 
	QString st;
	QDataStream in(tcpSocket);
	in.setVersion(QDataStream::Qt_4_0);
	if( tempSock->bytesAvailable() <= 0 )// changed from tcpSocket since tcpsocket will look for newely activeted connection only
	{
		//cout<<"\nNothing	Available for reading";
		return;
	}
	in >>st;
	int i=0;
	QChar *data = st.data();
	while (*data!=' ')
	{
		++data;
		i++;
	}
	QString s1=st.left(i);
	x=s1.toInt();
	QString s2=st.mid(i+1);
	y=s2.toInt();
	itr.value()->append(x);
	itr.value()->append(y);
	cout<<x<<" "<<y<<"  ";
	//move(x,y);
	QgsRect r=mQGisApp->getMapCanvas()->fullExtent();
	setRect(r);
	show();
	updateCanvas();
	}
}

void tcpCock::updatePixmap()
{
	
	QTcpSocket *tempSock=dynamic_cast<QTcpSocket *>(sender());
	if(tempSock)
	{
	cout<<"\n sock desc:"<<tempSock->socketDescriptor()<<"\t";
	QHash<int, QList<int>* >::const_iterator itr=hash.find(tempSock->socketDescriptor());
	
	QString st;
	QDataStream in(tcpSocket);
	in.setVersion(QDataStream::Qt_4_0);
	if( tempSock->bytesAvailable() <= 0 )// changed from tcpSocket since tcpsocket will look for newely activeted connection only
	{
		//cout<<"\nNothing	Available for reading";
		return;
	}
	in >>st;
	int i=0;
	QChar *data = st.data();
	while (*data!=' ')
	{
		++data;
		i++;
	}
	QString s1=st.left(i);
	x=s1.toInt();
	QString s2=st.mid(i+1);
	y=s2.toInt();
	itr.value()->append(x);
	itr.value()->append(y);
	cout<<x<<" "<<y<<"  ";
	//move(x,y);
	QgsRect r=mQGisApp->getMapCanvas()->fullExtent();
	setRect(r);
	show();
	updateCanvas();
	}
}

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following code will be called as in continuition in control flow of updateCanvas() , last statement above.

problem is whenever a new socket is activated , it is not able to read data sent by client. It always read 0 0 while client donot sent it.
here is piece of output i received.

Qt Code:

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Server is listening on Port 35000
 sock desc:16   0 0
 0 0
 sock desc:16   1 1
 1 1 0 0
 sock desc:16   2 2
 2 2 1 1 0 0
 sock desc:16   3 3
 3 3 2 2 1 1 0 0
 sock desc:16   4 4
 4 4 3 3 2 2 1 1 0 0
 sock desc:16   5 5
 5 5 4 4 3 3 2 2 1 1 0 0
 sock desc:16   6 6
 6 6 5 5 4 4 3 3 2 2 1 1 0 0
 sock desc:16   7 7
 7 7 6 6 5 5 4 4 3 3 2 2 1 1 0 0
 sock desc:16   8 8
 8 8 7 7 6 6 5 5 4 4 3 3 2 2 1 1 0 0
 sock desc:16   9 9
 9 9 8 8 7 7 6 6 5 5 4 4 3 3 2 2 1 1 0 0
 sock desc:17   0 0
 0 0
 9 9 8 8 7 7 6 6 5 5 4 4 3 3 2 2 1 1 0 0
 sock desc:16   0 0
 0 0
 0 0 9 9 8 8 7 7 6 6 5 5 4 4 3 3 2 2 1 1 0 0
 sock desc:17   1 1
 1 1 0 0
 0 0 9 9 8 8 7 7 6 6 5 5 4 4 3 3 2 2 1 1 0 0
 sock desc:16   0 0
 1 1 0 0
 0 0 0 0 9 9 8 8 7 7 6 6 5 5 4 4 3 3 2 2 1 1 0 0
 sock desc:17   2 2
 2 2 1 1 0 0
 0 0 0 0 9 9 8 8 7 7 6 6 5 5 4 4 3 3 2 2 1 1 0 0
 sock desc:16   0 0
 2 2 1 1 0 0
 0 0 0 0 0 0 9 9 8 8 7 7 6 6 5 5 4 4 3 3 2 2 1 1 0 0
 sock desc:17   3 3
 3 3 2 2 1 1 0 0
 0 0 0 0 0 0 9 9 8 8 7 7 6 6 5 5 4 4 3 3 2 2 1 1 0 0
 sock desc:16   0 0
 3 3 2 2 1 1 0 0
 0 0 0 0 0 0 0 0 9 9 8 8 7 7 6 6 5 5 4 4 3 3 2 2 1 1 0 0
 sock desc:17   4 4
 4 4 3 3 2 2 1 1 0 0
 0 0 0 0 0 0 0 0 9 9 8 8 7 7 6 6 5 5 4 4 3 3 2 2 1 1 0 0
 sock desc:16   0 0
 4 4 3 3 2 2 1 1 0 0
 0 0 0 0 0 0 0 0 0 0 9 9 8 8 7 7 6 6 5 5 4 4 3 3 2 2 1 1 0 0
 sock desc:17   5 5
 5 5 4 4 3 3 2 2 1 1 0 0
 0 0 0 0 0 0 0 0 0 0 9 9 8 8 7 7 6 6 5 5 4 4 3 3 2 2 1 1 0 0
 sock desc:16   0 0
 5 5 4 4 3 3 2 2 1 1 0 0
 0 0 0 0 0 0 0 0 0 0 0 0 9 9 8 8 7 7 6 6 5 5 4 4 3 3 2 2 1 1 0 0

Server is listening on Port 35000
 sock desc:16   0 0
 0 0
 sock desc:16   1 1
 1 1 0 0
 sock desc:16   2 2
 2 2 1 1 0 0
 sock desc:16   3 3
 3 3 2 2 1 1 0 0
 sock desc:16   4 4
 4 4 3 3 2 2 1 1 0 0
 sock desc:16   5 5
 5 5 4 4 3 3 2 2 1 1 0 0
 sock desc:16   6 6
 6 6 5 5 4 4 3 3 2 2 1 1 0 0
 sock desc:16   7 7
 7 7 6 6 5 5 4 4 3 3 2 2 1 1 0 0
 sock desc:16   8 8
 8 8 7 7 6 6 5 5 4 4 3 3 2 2 1 1 0 0
 sock desc:16   9 9
 9 9 8 8 7 7 6 6 5 5 4 4 3 3 2 2 1 1 0 0
 sock desc:17   0 0
 0 0
 9 9 8 8 7 7 6 6 5 5 4 4 3 3 2 2 1 1 0 0
 sock desc:16   0 0
 0 0
 0 0 9 9 8 8 7 7 6 6 5 5 4 4 3 3 2 2 1 1 0 0
 sock desc:17   1 1
 1 1 0 0
 0 0 9 9 8 8 7 7 6 6 5 5 4 4 3 3 2 2 1 1 0 0
 sock desc:16   0 0
 1 1 0 0
 0 0 0 0 9 9 8 8 7 7 6 6 5 5 4 4 3 3 2 2 1 1 0 0
 sock desc:17   2 2
 2 2 1 1 0 0
 0 0 0 0 9 9 8 8 7 7 6 6 5 5 4 4 3 3 2 2 1 1 0 0
 sock desc:16   0 0
 2 2 1 1 0 0
 0 0 0 0 0 0 9 9 8 8 7 7 6 6 5 5 4 4 3 3 2 2 1 1 0 0
 sock desc:17   3 3
 3 3 2 2 1 1 0 0
 0 0 0 0 0 0 9 9 8 8 7 7 6 6 5 5 4 4 3 3 2 2 1 1 0 0
 sock desc:16   0 0
 3 3 2 2 1 1 0 0
 0 0 0 0 0 0 0 0 9 9 8 8 7 7 6 6 5 5 4 4 3 3 2 2 1 1 0 0
 sock desc:17   4 4
 4 4 3 3 2 2 1 1 0 0
 0 0 0 0 0 0 0 0 9 9 8 8 7 7 6 6 5 5 4 4 3 3 2 2 1 1 0 0
 sock desc:16   0 0
 4 4 3 3 2 2 1 1 0 0
 0 0 0 0 0 0 0 0 0 0 9 9 8 8 7 7 6 6 5 5 4 4 3 3 2 2 1 1 0 0
 sock desc:17   5 5
 5 5 4 4 3 3 2 2 1 1 0 0
 0 0 0 0 0 0 0 0 0 0 9 9 8 8 7 7 6 6 5 5 4 4 3 3 2 2 1 1 0 0
 sock desc:16   0 0
 5 5 4 4 3 3 2 2 1 1 0 0
 0 0 0 0 0 0 0 0 0 0 0 0 9 9 8 8 7 7 6 6 5 5 4 4 3 3 2 2 1 1 0 0

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i had repeated it with multiple clients.
I couldn't figure out where exact pbm is.

regards
quick

**quickNitin** · 5th July 2006, 14:12

i did a silly mistake,
in slot updatePixmap() , i intialized stream to open a different socket as in line 11 of updatePixmap() place of

Qt Code:

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QDataStream in(tcpSocket);

QDataStream in(tcpSocket);

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this should have been

Qt Code:

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QDataStream in(tempSock);

QDataStream in(tempSock);

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cya
quick

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