Failed to compiled QT4 with Q_OBJECT when include header file

[d_stranz]

Possibly the problem is the private inheritance of Ui::myQtAppDLG. Try changing it to public or protected. The Q_OBJECT macro inserts some Qt meta-object source code into the class definition, and maybe this is incompatible with private inheritance of the UI class.

And take anda_skoa's suggestion for separating UI and processing code into different classes. It is never a good design to mix the two up. Makes for bad spaghetti.

[teleplan]

What if you just separate UI and processing into to classes?
A sensible thing to do in any case and could totally avoid the problem you are seeing.

Cheers,
_

Hi anda_skoa & d_stranz

I new with QT GUI, I using QT designer to generate a form. Then I use normal editor to write a source file. Original I use a sample code from internet which is running well. Once I add in my code [Not touch on any QT code] then it compiled error.

I not sure how to separate the UI, can you provide me guideline/example based on my above sample code? I had stuck with this many weeks.. really hope can settle it soon. bcoz backend I still need to do lots low level hardisk drive code.

I just need a simple GUI with few button, the button will send some hard disk command to retrieve some information. :-)

Thanks again.

Possibly the problem is the private inheritance of Ui::myQtAppDLG. Try changing it to public or protected. The Q_OBJECT macro inserts some Qt meta-object source code into the class definition, and maybe this is incompatible with private inheritance of the UI class.

And take anda_skoa's suggestion for separating UI and processing code into different classes. It is never a good design to mix the two up. Makes for bad spaghetti.

I had try this, unfortunately still same error.

[anda_skoa]

I not sure how to separate the UI, can you provide me guideline/example based on my above sample code?

You put all the non-UI code into a separate class and let the widget hold an instance of that class as a pointer.
That way you do not need any of these other includes in the header that has the Q_OBJECT.

Cheers,
_

[teleplan]

You put all the non-UI code into a separate class and let the widget hold an instance of that class as a pointer.
That way you do not need any of these other includes in the header that has the Q_OBJECT.

Cheers,
_

Hi anda_skoa,

Yes, it compiled now, I separate the non-UI code into another class.
Really not understand, why my previous QT3 can compiled without any problem which include non-UI code.

Anyway thanks for help...