[Gambas-devel] declaration of pointers how?

[Benoît Minisini]

Le 27/05/2013 23:30, PICCORO McKAY Lenz a écrit :
> i read the documentation and also the tutorial, but i have a problem..
>
> i try to implement finger print library fprint and there are many
> double pointers declarations, **var event *var..
>
> i decalre as Pointer var but how to this case of double pointers?
>
> NOTE: how could send code in maillist, mailman buch the mail if i send
> some gambas code
>
> Lenz McKAY Gerardo (PICCORO)
> http://qgqlochekone.blogspot.com
>

Sorry for the late answer!

Something like a "int **var" in C is just a pointer variable in Gambas. 
You declare it as "Pointer".

Now, how to access the value? You use the Pointer@() Gambas function and 
the others from the same family.

For example:

	int func(int **var);

becomes:

	Extern func(ppvar As Pointer) As Integer

And you use it that way:

	Dim pvar As Pointer
	
	' Send the address of pvar (which is a 'int *')
	func(VarPtr(pvar))

	' Now pvar contains a pointer that points at an integer
	Print Int@(pvar)

-- 
Benoît Minisini