PureBasic Forums - English

Posted: **Wed Nov 13, 2013 2:26 am**

Hi, I've been checking out purebasic for a while now and really like it for prototyping.

I've run into to a problem, which i'm sure there is an easy answer too, but, because of my lack of knowledge in purebasic, I'm having difficulty!
so if anyone could offer some enlightenment it would be much appreciated

I have three structs

Code: Select all

Structure dataStats
        max,i
        min.i
        longest.d
        shortest.d
endstructure

Structure testStats
         stat1.dataStats ;<- variable of type struct 
         Array ghouls.w (6)
Endstructure

Structure boreStats
        stat2.dataStats ;<- variable of type struct 
        wami.i
        freq.i
        Array fiends.w(10)
EndStructure

Global Dim idx.testStats (4) ; i creat globals to ease any hassle
Global Dim odx.boreStats (7)

as you can see above both structures contain a structure of type dataStats.
and both contain arrays

can anyone say how i can just pass the variable of type struct contained in the other structures
to a function, and also, how i can pass only the array to a procedure
i.e.

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Procedure testfiends( *pointer_to_structure.dataStats)
;update le stats
*pinter_to_structure\longest= 2
endprocedure

Procedure checkarray( *pointer_to_array )
;update le array
test = ArraySize( *pointer_to_array )
*pointer_to_array(2) = 4
endprocedure

testfiends ( @odx\stat2 ) ; ? like this does not work for me or @(odx\stat2)
testfiends ( @idx\stat1 )
checkarray ( @odx.fiends() ) ; pass arrays?

I'm sorry its very long winded but its been keeping me up at night, lol.

any insight is appreciated

best regards
Dazbo

Posted: **Wed Nov 13, 2013 2:48 am**

small snippet of your code...

Code: Select all

Procedure checkarray(Array artest.testStats(1), Array arbore.boreStats(1))
  ;update le array
  test = ArraySize(artest())
  artest(1)\stat1\max = 4
EndProcedure

checkarray(idx(), odx()) ;<-- pass arrays to procedure

Posted: **Wed Nov 13, 2013 3:10 am**

perhaps something like this:

Code: Select all

Procedure testfiends( *pointer_to_structure.dataStats)
;update le stats
*pointer_to_structure\longest= 2
EndProcedure

Procedure checkarray( Array my_array.w(1) ); you need to include at least one dimension in passed arrays
  ;update le array
  test = ArraySize( my_array() )
  my_array(2)=4
EndProcedure

x=2

testfiends ( odx(x)\stat2 ) ; you've created two arrays with your Dim statements, you'll need to include
testfiends ( idx(x)\stat1 ) ; an index (in this case, I've used a variable 'x' )

checkarray ( odx(x)\fiends() ) ; pass arrays like this

Posted: **Wed Nov 13, 2013 3:26 pm**

Thanks a lot citystate that worked, first time, with out a problem, I'm sure I had tried variations on what you put but I must have been too tired.

BTW

citystate wrote:; you've created two arrays with your Dim statements, you'll need to include
; an index (in this case, I've used a variable 'x' )

I had just forgot to add these when typing the example.

Just one other question can I have a pointer to an array within a struct which does not have an array keyword?
as in

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Array happy.d(10)

Structure be
 *pointer
 test.i
Endstructure
lets.be

lets\pointer = @happy()

Posted: **Wed Nov 13, 2013 5:34 pm**

A pointer contains a number, so obviously you can have a pointer in a structure to anything.
If the number is the base address of an array or the phone number of your girlfriend PB doesn't care.

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Dim happy.d(10) ; DIM not ARRAY 

happy(0) = 123.25
happy(9) = 256.25

Structure be
 *pointer
 test.i
EndStructure

lets.be

lets\pointer = @happy()

Debug PeekD(lets\pointer)
Debug PeekD(lets\pointer + SizeOf(double) * 9)

Posted: **Wed Nov 13, 2013 9:19 pm**

luis wrote: you can have a pointer in a structure to anything

yes I see, this is how I would expect it to work

luis wrote:
Code: Select all
Debug PeekD(lets\pointer + SizeOf(double) * 9)

and I notice that you have included some pointer arithmetic, which is very interesting.

thanks, very much, for your help.

ps.

luis wrote: DIM not ARRAY

I think "dim not awake" is more apt at times, lol.

Posted: **Wed Nov 13, 2013 9:36 pm**

If you want to get an headache you can read this thread where we were discussing pointers arithmetic in PB (and its limitations)

http://www.purebasic.fr/english/viewtop ... =3&t=48234

It's informative even if a little...disturbing...

And the help page on pointers here (also in the help file you got with PB) -> http://www.purebasic.com/documentation/ ... emory.html

Posted: **Wed Nov 13, 2013 9:47 pm**

luis wrote:If you want to get an headache you can read this thread where we were discussing pointers arithmetic in PB (and its limitations)
http://www.purebasic.fr/english/viewtop ... =3&t=48234

Excellent this was the type of info I was looking for, the fifth post by skywalk showed me some great info with regards to pointers specifically; being able to index a pointer using the square brackets.

thanx again!

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