An activex control made by Qt axserver, for receiving UDP data
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I made an activex control to receive UDP data, but readPendingDatagrams can not be called.
This code works in exe project.ActivexTest::ActivexTest(QWidget *parent) : QWidget(parent)
{
m_udpclient = new QUdpSocket(this);
connect(m_udpclient, SIGNAL(readyRead()), this, SLOT(readPendingDatagrams()));
m_udpclient->bind(4477);
}void ActivexTest::readPendingDatagrams()
{
while (m_udpclient->hasPendingDatagrams())
{
QByteArray datagram;
datagram.resize(m_udpclient->pendingDatagramSize());
QHostAddress sender;
quint16 senderPort;
m_udpclient->readDatagram(datagram.data(), datagram.size(), &sender, &senderPort);
}
}So, I started a thread to receive UDP data, but readPendingDatagrams can be called only for the first time.
void SocketThread::run()
{
m_udpclient = new QUdpSocket();
connect(m_udpclient, SIGNAL(readyRead()), this, SLOT(readPendingDatagrams()), Qt::DirectConnection);
m_udpclient->bind(m_port);
this->exec();
}void SocketThread::readPendingDatagrams()
{
while (m_udpclient->hasPendingDatagrams())
{
QByteArray datagram;
datagram.resize(m_udpclient->pendingDatagramSize());
QHostAddress sender;
quint16 senderPort;
m_udpclient->readDatagram(datagram.data(), datagram.size(), &sender, &senderPort);
}
}Is this Qt's bug? Or, what's wrong with my code? Thank you!
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Hi
This is a user forum and people are in different time zones so might take some days.
Also ActiveX is a windows thing so it makes question a bit special.
So I would give it some more time before losing hope :) -
@zhangsi If you have an activeX control, then you're inside some other .exe file and probably there's no processing of Qt events/signals.
Try callingQCoreApplication::processEvents()@hskoglund Thank you for your suggestion, I will try it.
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@zhangsi If you have an activeX control, then you're inside some other .exe file and probably there's no processing of Qt events/signals.
Try callingQCoreApplication::processEvents()@hskoglund Yes, it works. Thank you very much!
Resolution below:
void SocketThread::run()
{
m_udpclient = new QUdpSocket();
//connect(m_udpclient, SIGNAL(readyRead()), this, SLOT(readPendingDatagrams()), Qt::DirectConnection);
m_udpclient->bind(m_port);
while (1)
{
if (m_stop) break;
readPendingDatagrams();
msleep(1);
}
//this->exec();
}void SocketThread::readPendingDatagrams()
{
while (m_udpclient->hasPendingDatagrams())
{
QByteArray datagram;
datagram.resize(m_udpclient->pendingDatagramSize());
QHostAddress sender;
quint16 senderPort;
m_udpclient->readDatagram(datagram.data(), datagram.size(), &sender, &senderPort);
}
}It seems that signal/slot can not work well in axserver projects.
