network client socket without using signals and slots

[erqsor]

Hello,

I need to use a QTcpSocket for a 3D application (client side). My app has his own event loop, and I can't use signals and slots as the normal way (An QCoreApplication is not created). So I am trying to find an alternativ way.

I made a test application, and remarked that functions waitForXxx of the socket classes can't being used in my case, because I've to block my 3D application for waiting for events, and I can't permit that in my render loop :/

So I'm trying to understand how the eventsLoops of Qt are capturing signals for doing a similar thing in my event loop but it's pretty complicated ^^ (function QEventLoop:rocessEvents)

What I want exactly :
Adding a refresh function for verifying connection, disconnection, readyRead or readyWrite states of the socket.
State function returns a resfreshed state of the socket.

Someone can give me somes ideas for realising that ?
thanks.

here the code of my test application (we have to type "enter" to connect or disconnect):

#include <QtCore>
#include <QtNetwork>
#include <windows.h>
#include <iostream>
 
void connectOrDisconnect(QTcpSocket * socket)
{
	if ( socket != NULL )
	{
		if ( socket->state() == QAbstractSocket::UnconnectedState )
		{
			socket->connectToHost("localhost", 1337);
		}
		else if ( socket->state() == QAbstractSocket::ConnectedState )
		{
			socket->disconnectFromHost();
		}
		else
		{
			socket->abort();
		}
	}
}
 
int main(int argc, char *argv[])
{
	QTcpSocket * socket = new QTcpSocket;
	int stateEnter;
 
	while (1)
	{
		int lastStateEnter = stateEnter;
		stateEnter = GetKeyState(VK_RETURN);
		if ( lastStateEnter != stateEnter && GetKeyState(VK_RETURN) < 0 )
		{
			connectOrDisconnect( socket );
		}
 
		if ( socket->state() == QAbstractSocket::UnconnectedState && socket->waitForConnected(100) )
			std::cout << "disconnected" << std::endl;
		if ( socket->state() == QAbstractSocket::ConnectedState && socket->waitForDisconnected(100) )
			std::cout << "disconnected" << std::endl;
		if ( socket->waitForReadyRead(100) )
			std::cout << "ReadyRead" << std::endl;
		if ( socket->bytesAvailable() )
			std::cout << QString::number(socket->bytesAvailable()).toStdString() << " bytes available" << std::endl;
 
		switch ( socket->state() )
		{
			case QAbstractSocket::UnconnectedState:
				std::cout << "UnconnectedState" << std::endl;
				break;
			case QAbstractSocket::HostLookupState:
				std::cout << "HostLookupState" << std::endl;
				break;
			case QAbstractSocket::ConnectingState:
				std::cout << "ConnectingState" << std::endl;
				break;
			case QAbstractSocket::ConnectedState:
				std::cout << "ConnectedState" << std::endl;
				break;
			case QAbstractSocket::BoundState:
				std::cout << "BoundState" << std::endl;
				break;
			case QAbstractSocket::ClosingState:
				std::cout << "ClosingState" << std::endl;
				break;
			case QAbstractSocket::ListeningState:
				std::cout << "ListeningState" << std::endl;
				break;
			default:
				std::cout << "Unknow" << std::endl;
				break;
		}
	}
}

#include <QtCore>
#include <QtNetwork>
#include <windows.h>
#include <iostream>

void connectOrDisconnect(QTcpSocket * socket)
{
	if ( socket != NULL )
	{
		if ( socket->state() == QAbstractSocket::UnconnectedState )
		{
			socket->connectToHost("localhost", 1337);
		}
		else if ( socket->state() == QAbstractSocket::ConnectedState )
		{
			socket->disconnectFromHost();
		}
		else
		{
			socket->abort();
		}
	}
}

int main(int argc, char *argv[])
{
	QTcpSocket * socket = new QTcpSocket;
	int stateEnter;
	
	while (1)
	{
		int lastStateEnter = stateEnter;
		stateEnter = GetKeyState(VK_RETURN);
		if ( lastStateEnter != stateEnter && GetKeyState(VK_RETURN) < 0 )
		{
			connectOrDisconnect( socket );
		}
		
		if ( socket->state() == QAbstractSocket::UnconnectedState && socket->waitForConnected(100) )
			std::cout << "disconnected" << std::endl;
		if ( socket->state() == QAbstractSocket::ConnectedState && socket->waitForDisconnected(100) )
			std::cout << "disconnected" << std::endl;
		if ( socket->waitForReadyRead(100) )
			std::cout << "ReadyRead" << std::endl;
		if ( socket->bytesAvailable() )
			std::cout << QString::number(socket->bytesAvailable()).toStdString() << " bytes available" << std::endl;

		switch ( socket->state() )
		{
			case QAbstractSocket::UnconnectedState:
				std::cout << "UnconnectedState" << std::endl;
				break;
			case QAbstractSocket::HostLookupState:
				std::cout << "HostLookupState" << std::endl;
				break;
			case QAbstractSocket::ConnectingState:
				std::cout << "ConnectingState" << std::endl;
				break;
			case QAbstractSocket::ConnectedState:
				std::cout << "ConnectedState" << std::endl;
				break;
			case QAbstractSocket::BoundState:
				std::cout << "BoundState" << std::endl;
				break;
			case QAbstractSocket::ClosingState:
				std::cout << "ClosingState" << std::endl;
				break;
			case QAbstractSocket::ListeningState:
				std::cout << "ListeningState" << std::endl;
				break;
			default:
				std::cout << "Unknow" << std::endl;
				break;
		}
	}
}

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If found this code in QAbstractSocket::waitForConnected :

if (d->socketEngine && d->socketEngine->waitForWrite(timeout, &timedOut) && !timedOut) {
            d->_q_testConnection();
        } else {
            d->_q_connectToNextAddress();
        }

if (d->socketEngine && d->socketEngine->waitForWrite(timeout, &timedOut) && !timedOut) {
            d->_q_testConnection();
        } else {
            d->_q_connectToNextAddress();
        }

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but I don't know what is d ? and socketEngine (maybe the platforme dependant socket object) ?