Subclassing QDir

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jcr

Beginner

Posts: 23

Thursday, March 24th 2005, 9:59pm

Subclassing QDir

I'd like to create the ZDir class to add facilities to QDir.

Source code

//header file
#ifndef ZDIR_H
#define ZDIR_H
#include <qdir.h>
class ZDir : public QDir
{
	Q_OBJECT
public:
	ZDir();
};
#endif
//implementation file
#include "zdir.h"
#include <qdir.h>

As such, the implementation file does not compile because the compiler does not recognize Q_OBJECT. It asks for an ";" before "public" and wonders about its type. Without Q_OBJECT, there is however no problem.
Could anyone explain why it is so?
Many thanks

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jacek

Master

Posts: 2,729

Location: Warsaw, Poland

Thursday, March 24th 2005, 10:07pm

RE: Subclassing QDir

Quoted

Originally posted by jcr
Could anyone explain why it is so?

QDir doesn't inherit QObject.

You can meet me at Qt Centre - The Ultimate Qt Community site.

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jcr

Beginner

Posts: 23

Thursday, March 24th 2005, 10:29pm

RE: Subclassing QDir

Better approaches would therefore be to
1. inherit QObject and add a public QDir member
2. inherit both QObject and QDir
thanks

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jacek

Master

Posts: 2,729

Location: Warsaw, Poland

Thursday, March 24th 2005, 10:54pm

RE: Subclassing QDir

Quoted

Originally posted by jcr
Better approaches would therefore be to
1. inherit QObject and add a public QDir member
2. inherit both QObject and QDir

If this is a question, then answer depends on what you want to do.

You can meet me at Qt Centre - The Ultimate Qt Community site.

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