QStringList with Signal/Slot

[Sivert]

Hi, how can I send QStringList with signal ? I mean like:

signals:
void sig( QStringList & );
(...)
QStringList list;
emit sig( list );

signals:
void sig( QStringList & );
(...)
QStringList list;
emit sig( list );

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But it won't work. I've read something about QVariant but can't get it to work either. Any suggestions ?

[jpn]

You can either register QStringList as a meta type:

qRegisterMetaType<QStringList>("QStringList");

qRegisterMetaType<QStringList>("QStringList");

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or use a QVariant holding a string list:

signals:
      void sig( QVariant & );
      (...)
      QStringList list;
      emit sig( QVariant(list) );

signals:
      void sig( QVariant & );
      (...)
      QStringList list;
      emit sig( QVariant(list) );

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[Sivert]

You can either register QStringList as a meta type:

qRegisterMetaType<QStringList>("QStringList");

qRegisterMetaType<QStringList>("QStringList");

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or use a QVariant holding a string list:

signals:
      void sig( QVariant & );
      (...)
      QStringList list;
      emit sig( QVariant(list) );

signals:
      void sig( QVariant & );
      (...)
      QStringList list;
      emit sig( QVariant(list) );

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First option doesn't seem to work . For the second I'm still getting empty QStringList.
When I use what you posted and add a slot.

void Main::sig( QVariant &var )
{
	QStringListIterator i( var.toStringList() );
	while ( i.hasNext() ) { qDebug() << i.next();}
	qDebug() << "sig";
}

void Main::sig( QVariant &var )
{
	QStringListIterator i( var.toStringList() );
	while ( i.hasNext() ) { qDebug() << i.next();}
	qDebug() << "sig";
}

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Then this won't show anything but "sig", var is empty.

[jpn]

This works fine for me:

#include <QObject>
#include <QVariant>
#include <QStringList>
#include <QCoreApplication>
#include <QtDebug>
 
class Sender : public QObject {
	Q_OBJECT
public:
	void send() {
		QStringList stringList = (QStringList() << "a" << "b" << "c");
		emit signal(QVariant(stringList));
	}
signals:
	void signal(QVariant &var);
};
 
class Receiver : public QObject {
	Q_OBJECT
public slots:
	void slot(QVariant &var) {
		qDebug() << var.toStringList();
	}
};
 
int main(int argc, char *argv[]) {
	QCoreApplication a(argc, argv);
	Sender s;
	Receiver r;
	QObject::connect(&s, SIGNAL(signal(QVariant&)), &r, SLOT(slot(QVariant&)));
	s.send();
}
 
#include "main.moc"

#include <QObject>
#include <QVariant>
#include <QStringList>
#include <QCoreApplication>
#include <QtDebug>

class Sender : public QObject {
	Q_OBJECT
public:
	void send() {
		QStringList stringList = (QStringList() << "a" << "b" << "c");
		emit signal(QVariant(stringList));
	}
signals:
	void signal(QVariant &var);
};

class Receiver : public QObject {
	Q_OBJECT
public slots:
	void slot(QVariant &var) {
		qDebug() << var.toStringList();
	}
};

int main(int argc, char *argv[]) {
	QCoreApplication a(argc, argv);
	Sender s;
	Receiver r;
	QObject::connect(&s, SIGNAL(signal(QVariant&)), &r, SLOT(slot(QVariant&)));
	s.send();
}

#include "main.moc"

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Output:

("a", "b", "c")

[Sivert]

Works fine thank you. It was a problem with a function. I had a function that returned QStringList and it always return empty one. Dunno why but I changed a few things and it works nice.