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List:       kde-devel
Subject:    Re: reading from a pipe KIO::Connection?
From:       Jeroen Wijnhout <Jeroen.Wijnhout () kdemail ! net>
Date:       2003-09-13 12:15:45
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On Saturday 13 September 2003 10:54, Jeroen Wijnhout wrote:
> Hi,
>
> I'm trying to read from a name pipe (FIFO) using the class KIO::Connection,
> however I'm not able to read from a pipe at all (the receive() slot is
> never called). Can somebody help me to get this code right, or give another
> way to read from a pipe? A slot should be activated if there is data to be
> read from the pipe (or a mechanism like in kprocess would actually be
> nicer).

Hi again,

I've changed the code to use QSocketNotifier. There are two problems. First of 
all, the mainwindow is not shown before some data is sent to the pipe. The 
second problem is that QSocketNotifier keeps firing the activated() signal, 
although I am ready all the data. Any ideas?

thanks,
Jeroen

lyxserver::lyxserver()
    : KMainWindow( 0, "lyxserver" )
{
    // set the shell's ui resource file
    setXMLFile("lyxserverui.rc");

	QHBoxLayout *layout = new QHBoxLayout(this);
    layout->addWidget(m_te = new KTextEdit(this, "ml_edit" ));

	show();

	m_pipeIn = new QFile("/home/wijnhout/.lyxpipe.in");
	if (m_pipeIn->open(IO_ReadOnly))
	{
		kdDebug() << "pipeIn opened with handle " << m_pipeIn->handle() << endl;
	}
	else
		kdError() << "could not open pipeIn" << endl;

	m_notifier = new QSocketNotifier(m_pipeIn->handle(),QSocketNotifier::Read, 
0);
	connect(m_notifier, SIGNAL(activated(int)), this, SLOT(receive()));
}

lyxserver::~lyxserver()
{
}

void lyxserver::receive()
{
	kdDebug() << "reading data..." << endl;
	m_notifier->setEnabled(false);
	QString line;
	while ( m_pipeIn->readLine(line, 80) > -1)
	{
		m_te->append(line);
	}
	kdDebug() << "done" << endl;
	m_notifier->setEnabled(true);
}


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