QTcpSocekt dosent recive msg

[Zergi]

Hi

I have very strange problem, QTcpSocket recive msg when i write something like that

tcpSocket->write("P\n");

tcpSocket->write("P\n");

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but if i write something like that

tcpSocket->write("P"+t.toLatin1());

tcpSocket->write("P"+t.toLatin1());

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it dosent work
where t is QString

Sending function(server)

void server::Twyslijdane()
{
	QString t;
	QSettings settings("Users.ini",QSettings::IniFormat);
	keys = settings.allKeys();
    for (int i = 0; i < keys.size(); i = i+2)  {
        t = keys.at(i);
        t.remove(QString("/Login"), Qt::CaseInsensitive);
        t.remove(QString("/pass"), Qt::CaseInsensitive);
 
 
        connection->write("D"+t.toLatin1());
 
    }
}

void server::Twyslijdane()
{
	QString t;
	QSettings settings("Users.ini",QSettings::IniFormat);
	keys = settings.allKeys();
    for (int i = 0; i < keys.size(); i = i+2)  {
        t = keys.at(i);
        t.remove(QString("/Login"), Qt::CaseInsensitive);
        t.remove(QString("/pass"), Qt::CaseInsensitive);
        
        
        connection->write("D"+t.toLatin1());

    }
}

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reciving function

{
	qint64 bytes = buffer->write(tcpSocket->readAll());
	// go back as many bytes as we just wrote so that it can be read
	buffer->seek(buffer->pos() - bytes);
	// read only full lines, line by line
	while (buffer->canReadLine())
	{
		line = buffer->readLine();
	        if(line[0] == 'D'){
		line.remove(0,1);
		dodajnicki(line);
	}
 
	}
 
 
 
}

{
	qint64 bytes = buffer->write(tcpSocket->readAll());
	// go back as many bytes as we just wrote so that it can be read
	buffer->seek(buffer->pos() - bytes);
	// read only full lines, line by line
	while (buffer->canReadLine())
	{
		line = buffer->readLine();
	        if(line[0] == 'D'){
		line.remove(0,1);
		dodajnicki(line);
	}

	}
	
	
	
}

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When i m sending tcpSocket->write("P"+t.toLatin1()); program dosent use
this part of code

while (buffer->canReadLine())
	{
		line = buffer->readLine();
	        if(line[0] == 'D'){
		line.remove(0,1);
		dodajnicki(line);
	}

while (buffer->canReadLine())
	{
		line = buffer->readLine();
	        if(line[0] == 'D'){
		line.remove(0,1);
		dodajnicki(line);
	}

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Best Regards

[jacek]

What happens if you send "P" + t.toLatin1() + "\n"?

[bender86]

tcpSocket->write("P\n");            // "P\n" is a const char *
tcpSocket->write("P"+t.toLatin1()); // "P" + t.toLatin1() is a QString

tcpSocket->write("P\n");            // "P\n" is a const char *
tcpSocket->write("P"+t.toLatin1()); // "P" + t.toLatin1() is a QString

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Does QIODevice::canReadLine() expect to read char* data? If so, you can use

tcpSocket->write(QString("P" + t).toLatin1().data());

tcpSocket->write(QString("P" + t).toLatin1().data());

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[jacek]

"P" + t.toLatin1() is a QString

That's a QByteArray, not QString.

[Fastman]

May be:

QByteArray block;
QDataStream out(&block, QIODevice::WriteOnly);
out.setVersion(QDataStream::Qt_4_0);
 
block = NULL;
block.append("Some Msg");
tcpSocket->write(block);

QByteArray block;
QDataStream out(&block, QIODevice::WriteOnly);
out.setVersion(QDataStream::Qt_4_0);

block = NULL;
block.append("Some Msg");
tcpSocket->write(block);

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[bender86]

That's a QByteArray, not QString.

Right. So the problem is not that. Try how suggested by jacek.