opening exe files, comercial version vs opensource

[jpn]

• Use meaningful thread titles. "few general question" tells nothing about actual thread context.
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Another question:
I want to do sub menu. I mean I have menu in the top of the application with the right slot who calls the function
like in save ->save function

Signals and Slots

now I want the function to open a dialog that the user can choose color.
I read I need to use ColorListEditor . still not sure if I need to create a widget? if I understand correctly no need to delete it later?
also not sure what s the result of that class. do I need to use the visual editor for that?
hope I am clear

I'm afraid you're not very clear. Of course you need to create a widget if you want to show an additional window. A modal dialog may be allocated on the stack, any other widget may not.

It there a reson why sometimes the app include in different ways??
why the different ways are needed and when should I use them?

Forward declaration

[Gily]

thanks for your answer
what I wanted to know , if there is common use/agreement for QT users when to use Forward_declaration an when to include?
is there a way /convention?

[jpn]

what I wanted to know , if there is common use/agreement for QT users when to use Forward_declaration an when to include?
is there a way /convention?

It is a good practice to use forward declarations whenever possible. It will make compilation faster. A forward declaration is enough when the corresponding type is only used as a reference or as a pointer, in other words, when the compiler doesn't need to know actual size of the type. I'm sure this is all explained in more detailed in the given wiki article.