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Re: Message from the system. [message #27121 is a reply to message #27119]

Sat, 26 June 2010 22:07

281264
Messages: 272
Registered: June 2010
Location: Spain

Experienced Member

Hi,

I am attaching the files of the application in question (please remember that the purpose is to get familiar with U++). The application is very simple: open a dialog by clicking the button in the TopWindow; then type two (double) values in the Edit Fields; then press OK button , close dialog and then compute the multiplication and then show the outcome in the EditField in the TopWindow.

The idea is to practice with dialogs: how to create them, how to transfer values to the TopWindow, etc.

You will see that I still have no idea about how to position the widgets in the dialog, therefore the layout in the dialog is rubbish.

Taking advantage of your help, please allow me to ask some questions:

1.- How to pass the values from the EditFields in the dialog to the TopWindow; so far I have declared public the variables in the dialog so they can be accessed;
2.- How a string captured by a EditField can be converted to a numerical value (let us say double) and vice versa;
3.- How a dialog can be �closed� without having problems with the memoey? For example how is guaranteed that the dialog is deleted.
4.- In the manual I have seen expressions of this kind:
virtual Value Scan(const Value& text) const
4.1.- What is the role of the �virtual� qualifier? I have seen that virtual functions are specially made for been overridden.
4.2.- Why the argument is a &?
4.3.- Any other suggestion related with "good" practices when programming.

I am sorry about my poor knowledge of C++. Your help is very appreciated.

Many thanks.

Best wishes,

Javier

Attachment: Primer_Programa.rar
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