Enum To QString Conversion

[yagabey]

Hello,
I am trying to get text representation of SocketState enum.

In the header of my class i registered the enum:

class QSound;
class SoundNode : public QObject
{
    Q_OBJECT
public:
    Q_ENUMS(QAbstractSocket::SocketState);

class QSound;
class SoundNode : public QObject
{
    Q_OBJECT
public:
    Q_ENUMS(QAbstractSocket::SocketState);

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In the source:

QMetaObject metaObject ;
    metaObject= QAbstractSocket::staticMetaObject;
    QMetaEnum metaEnum = metaObject.enumerator(metaObject.indexOfEnumerator("SocketState" ) );
    QString test(metaEnum.valueToKey(QAbstractSocket::ConnectionRefusedError));
    qDebug()<<test;

QMetaObject metaObject ;
    metaObject= QAbstractSocket::staticMetaObject;
    QMetaEnum metaEnum = metaObject.enumerator(metaObject.indexOfEnumerator("SocketState" ) );
    QString test(metaEnum.valueToKey(QAbstractSocket::ConnectionRefusedError));
    qDebug()<<test;

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Here qDebug returns an empty string instead of "ConnectionRefusedError". What is going wrong here, any idea?

Thanks in advance..

[wysota]

SocketState is not a registered Q_ENUM in QAbstractSocket therefore its meta-object doesn't know anything about it. Registering it in your class might (I haven't checked) put it into your class's meta-object and not QAbstractSocket's.

[yagabey]

Hello Wysota,

Actually I tried that as seen above:

Q_ENUMS(QAbstractSocket::SocketState);

Q_ENUMS(QAbstractSocket::SocketState);

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But not working...

[MarekR22]

If enum has meta data then it shouldn't be a problem.
Your problem is that you definition of enum in one class QAbstractSocket and you try define those meta data in other class SoundNode (use of Q_ENUMS).
So first try use meta data of you class SoundNode, like this:

QMetaEnum metaEnum = SoundNode::staticMetaObject.enumerator(SoundNode::staticMetaObject.indexOfEnumerator("QAbstractSocket::SocketState" ) );
Q_ASSERT(metaEnum.isValid());
QString test(metaEnum.valueToKey(QAbstractSocket::ConnectionRefusedError));

QMetaEnum metaEnum = SoundNode::staticMetaObject.enumerator(SoundNode::staticMetaObject.indexOfEnumerator("QAbstractSocket::SocketState" ) );
Q_ASSERT(metaEnum.isValid());
QString test(metaEnum.valueToKey(QAbstractSocket::ConnectionRefusedError));

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[wysota]

Read my post again.

This simple code can be used to list enums registered with a particular class:

#include <QtCore>
#include <QtGui>
 
int main() {
  const QMetaObject & mo = QListView::staticMetaObject;
  qDebug() << "Available enums in" << mo.className() << ":" << mo.enumeratorCount();
  int i =0;
  QMetaEnum en;
  while((en = mo.enumerator(i++)).isValid()) {
    qDebug() << en.name();
  }
  return 0;
}

#include <QtCore>
#include <QtGui>

int main() {
  const QMetaObject & mo = QListView::staticMetaObject;
  qDebug() << "Available enums in" << mo.className() << ":" << mo.enumeratorCount();
  int i =0;
  QMetaEnum en;
  while((en = mo.enumerator(i++)).isValid()) {
    qDebug() << en.name();
  }
  return 0;
}

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For QListView it returns:

Available enums in QListView : 13
Shape
Shadow
SelectionMode
SelectionBehavior
ScrollHint
EditTriggers
ScrollMode
DragDropMode
Movement
Flow
ResizeMode
LayoutMode
ViewMode

For QAbstractSocket it doesn't return any enums.

[yagabey]

This gives, assert error..

Read my post again.

Sorry, i think i am missing something. When i declare:

Q_ENUMS(QAbstractSocket::SocketState);

Q_ENUMS(QAbstractSocket::SocketState);

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in SoundNode' s header, doesnt it mean that i register that enum for my class?

[wysota]

Yes. For your class. Not for QAbstractSocket. Open moc_soundnote.cpp and see what's in there regarding SocketState (you can see there is nothing there because there is no real enum in your class).