a main window class for console app - non GUI

[arsinte_andrei]

at the moment I have this

int main(int argc, char *argv[]) {

	QCoreApplication a(argc, argv);

	myServer server;
	server.listen(adr, port);

    return a.exec();
}

and I wish to move this bit

atpTcpServer server;
server.listen(adr, port);

to a class - separate files myClass.h / myClass.cpp

#ifndef MYCLASS_H
#define MYCLASS_H

#include <QObject>

#include <myServer.h>

class myClass : public QObject {
		Q_OBJECT

	public:
		explicit myClass(QObject *parent = nullptr);

	signals:
		void quit();

	public slots:
		void startAll();
		void quitApp();

	private slots:
		void initIni();
		bool initSQL();
		void initServer();

	private:
		myServer server;

};

#endif 

that is the h file and the c++ is the following

#include "myClass.h"

atpCommandsProcessing::atpCommandsProcessing(QObject *parent) : QObject(parent) {

}

void atpCommandsProcessing::startAll() {
	initServer(); //start the server and some other stuff here

}

void atpCommandsProcessing::quitApp() {
	emit quit();
}

void myClass::initServer() {
	

}

and as soon as my main.cpp becomes like that

int main(int argc, char *argv[]) {

    QCoreApplication a(argc, argv);

	myClass myComPro;
	myComPro.startAll();

    return a.exec();
}

after that my servers start but shortly after is destroyed.. why??? I think that my class is not in the event loop?? I wish to be like mainwindow class for the GUI sistem.. how can I do that?? to have a main window where to process everything and that not to be in main.cpp
is that possible in Qt?? - hope it is...
any advice??

Many thanks

[sierdzio]

Yes it is possible and your code looks correct, at least the part that you have shared.

Some things to remember:

• even loop starts in a.exec(). It is not running yet when you call myComPro.startAll()
• if you want to start your code after even loop, use QTimer::singleShot(0, [&myComPro]() {myComPro.startAll()})
• app won't quit until you stop the even loop (a.quit())

[J.Hilk]

@sierdzio actually how does QCoreApplication behave, on default, when no Widget is opened before the event loop?

I would assume, lastWindowClosed() is emitted. -> closing the application ?

[sierdzio]

@J.Hilk said in a main window class for console app - non GUI:

I would assume, lastWindowClosed() is emitted. -> closing the application ?

Q Core Application ;-) No such signal there.

[J.Hilk]

@sierdzio
x) my bad

[arsinte_andrei]

@sierdzio said in a main window class for console app - non GUI:

Yes it is possible and your code looks correct, at least the part that you have shared.

Some things to remember:

• even loop starts in a.exec(). It is not running yet when you call myComPro.startAll()
• if you want to start your code after even loop, use QTimer::singleShot(0, [&myComPro]() {myComPro.startAll()})
• app won't quit until you stop the even loop (a.quit())

I've just tried that and is giving me this

QEventLoop: Cannot be used without QApplication
atpTCPRunnable(0x555b6e1ba7c0) started on  QThread(0x555b6e1bae40, name = "Thread (pooled)")
QEventLoop: Cannot be used without QApplication

where should I use the Qapplication?? should I do the myComPro en extent of it??

[sierdzio]

You have to put that timer after QCoreApplication a(argc, argv);.

[arsinte_andrei]

@sierdzio of course - this is what I've done but that was the error..

[J.Hilk]

@arsinte_andrei can you please copy and paste your exact main.cpp ?

[arsinte_andrei]

I've even tried
QMetaObject::invokeMethod( &comPro, "startAll", Qt::QueuedConnection );

[arsinte_andrei]

@J.Hilk yes here you have it a working one in the main.cpp

#include <QtCore>
#include <QCoreApplication>
#include <QtDebug>
#include <QFile>
#include <QTextStream>
#include <QtGlobal>
#include <stdio.h>
#include <stdlib.h>
#include <QDebug>

#include <atpcommandsprocessing.h>


int main(int argc, char *argv[]) {

	//TODO qInstallMessageHandler have to be enabled at the end
	//	qInstallMessageHandler(myMessageOutput); // Install the handler

	QCoreApplication::setOrganizationName("@atp@");
	QCoreApplication::setOrganizationDomain("arsinte.co.uk");
	QCoreApplication::setApplicationName("atpServerSmartHomeSystem");

    QCoreApplication a(argc, argv);

//	atpCommandsProcessing myComPro;
//	myComPro.startAll();


	atp_Ini atpInf;

	QHostAddress adr = QHostAddress::Any;
	adr.setAddress(atpInf.get_ServerAddress());
	atpTcpServer server;
	server.setMode(static_cast<atpTcpServer::ThreadMode>( atpInf.get_ThreadMode()));
	server.setMaxConnections(atpInf.get_maxConnections());
	server.setConnectionTimeout(atpInf.get_timeOut());
	server.listen(adr, atpInf.get_ServerPortNo());

//	QTimer::singleShot(0, [&myComPro]() {myComPro.startAll();});

//	QObject::connect(&myComPro, &atpCommandsProcessing::quit, &a, &QCoreApplication::quit);


    return a.exec();
}

[arsinte_andrei]

Oh.. sorry ... I'm so stupid...
in my function * startAll* I had

atpTcpServer server;

and as soon as the function finished even the server was closed... I've moved that declaration to the h file in private declarations and everything is working perfectly....

many Thanks to everyone - especially to @sierdzio

God bless

[sierdzio]

No problem, it happens to everybody sometimes :-) Happy coding!