[V4RB] beginners question store global objectRefs

[Ruslan Zasukhin]

On 6/24/05 11:46 AM, "peter salomon" <peter.salomon at gmx.net> wrote:

> Hi all,
> 
> as i come from Lingo i have not well understood how RB handles global
> variables. I know that this one is more a RB question but maybe
> concerning V4rb there might be a common way..
> 
> I´ve tested the tutorial file where the databaseobject was created by
> caling "new"
> Then it´s stored within a property which is set to public.
> ok so far, i can use it within THIS window.

YES, and because it is public you can access it from other places

    window.mDB 
 
> But now i want to implement other functions within another new window,
> e.g. a preferencepanel.
 
> when i try to use the databaseobject from main windows property i get a
> nilobjectexception.

Sounds like you USE it before you have initialize it.

> hm - ok, so i made a function in which i transport the objectreference
> to the new window, something like:

NO NEED
 
> prefsWindow.prepare(databaseRef)
> 
> method prepare is defined as
> prepare(inDB As VDatabase)
> 
> // filling properties
> mtblA = inDB.table("tblA")
> mtblB = inDB.table("tblB")
> .
> me.show()
> .
> end
> 
>  i have created again some properties for this window with my tableRef
> names:
> 
> inDB As VDatabase
> mtblA As VTable
> mtblB As VTable...
> 
> so i thought i would have created tablereferences and made them public
> for all other methods.
> But when i want to use them e always get a nilobjectexception on my
> tablereferences.
> 
> what is wrong here? I have thought that this must work...
> next step could be to define methods in main window and just call them
> from the new window but interaction between them seems to be ugly to me:
> 
> from newWindow, e.g. pushbutton action:
> call mainWindow.methodA()
> 
> and method in mainwindow:
> 
> methodA()
> 
> // some dbqueries
> .
> .
> call newWindow.methodB(resultFromMainWin)
> end
> 
> So - which is the common way to use several windows using a valentinaDB?
> 
> thanks for help,
> peter
> 
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-- 
Best regards,

Ruslan Zasukhin
VP Engineering and New Technology
Paradigma Software, Inc

Valentina - Joining Worlds of Information
http://www.paradigmasoft.com

[I feel the need: the need for speed]