[SOLVED]C++ class with QML
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Hello i ve recently made a demo class to test if i can declare its object in main:
Butit gives me unresolved external error, here is the header file:
@
#ifndef DETECTSQUARES_H
#define DETECTSQUARES_H#include <QObject>
class DetectSquares: public QObject
{
Q_OBJECT
Q_PROPERTY(QString author READ author WRITE setAuthor NOTIFY authorChanged)
public:
explicit DetectSquares(QObject *parent=0);
~DetectSquares();
};#endif // DETECTSQUARES_H
@I get error when i declare
DetectSquares r;[Edited - Please use code tags "@@" - p3c0]
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Hi,
It seems you have not defined the functions for the property author. Just right click on Q_PROPERTY and click "Generate missiin Q_PROPERTY members".
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@@ class DetectSquares: public QObject
{
Q_OBJECT
public:
void Draw();
}; @@I made it simple but if i call it in the main function like this :
@@ DetectSquares * r();
r.Draw(); @@I get error .Draw must have class/struct/union
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Since you are decalring it a pointer it should be
@
DetectSquares *r;
r->Draw();
@or keep it on stack
@
DetectSquares r;
r.Draw();
@
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If you choose to use a pointer do not forget to create the object.
Even if that compiles you will get a crash because r does not point to a valid object.
Even better use an automatic pointer to avoid memory leaks:
@QScopedPointer<DetectSquares> r(new DetectSquares());
r->Draw();@
