On 9 Nov 2016, at 02:33, Igor Stasenko <siguctua@gmail.com> wrote:

On 8 November 2016 at 13:11, Esteban Lorenzano <estebanlm@gmail.com> wrote:

On 8 Nov 2016, at 12:55, Dimitris Chloupis <kilon.alios@gmail.com> wrote:

Thank you Esteban 

By the way I really love the design of UFFI , very clean and quite easy to understand , great work to you and Igor :) 

UFFI is just mine ;)

(but I sanded in giant shoulders as I took Igor work as inspiration��� and to ���borrow��� many cool ideas)

Your credit is too generous :)
Btw, is this expression:

 FFITypeArray ofType: #char.

creates anonymous class, or you making an instance of something?

Because if it anonymous class, i was always warned against use it in such form, and instead use some kind of class initializers to 
generate all the 'types' you will use in future i.e.

MyCalss class>>initialize
   MyCharr100Type := FFITypeArray ofType: #char size:100.

and then just use it wherever you need i.e.:

mychars := MyChar100Type new.

.. whatever.
 

Esteban

On Tue, Nov 8, 2016 at 1:54 PM Esteban Lorenzano <estebanlm@gmail.com> wrote:

On 8 Nov 2016, at 12:49, Dimitris Chloupis <kilon.alios@gmail.com> wrote:

I was reaching a similar conclusion

Currently I have a void pointer to the struct with the members I mentioned 

I can get char[100] 

pointerToStruct fromCString

and I can get the int with

pointerToStruct getHandle integerAt: 101 size:4  signed: false

so if I want to pass the address of the pointer to my YourStruct instance will I have to initialize with

YourStruct fromHandler: (pointerToStruct getHandle) 

is this a correct and safe way to pass the address ? 

yes.

Esteban

On Tue, Nov 8, 2016 at 1:21 PM Esteban Lorenzano <estebanlm@gmail.com> wrote:

it never could.
you need to do a ���special type���, who has to be something like:

YourStruct class>>initialize
        Char100 := FFITypeArray ofType: #char.

fieldsDesc
        ^ #(
        Char100 data;
        int count;
        )

but then��� you want to optimise that and in field accessors, who will look something like this:

YourStruct >>data
        "This method was automatically generated"
        ^(FFITypeArray ofType: #char size: 100) fromHandle: (handle copyFrom: 1 to: 100)

you can change that for:

YourStruct >>data
        "This method was automatically generated"
        ^Char100 fromHandle: (handle copyFrom: 1 to: 100)

and same for setter.
(other way will work, but it will be suboptimal)

Esteban

> On 8 Nov 2016, at 12:10, Dimitris Chloupis <kilon.alios@gmail.com> wrote:
>
> I have FFIExternalStructure which has at class side
>
> fieldsDesc
> ^#(
> char data[100];
> int count;
> )
>
> if I try to do
>
> EphCPPTestStructure rebuildFieldAccessors .
>
> in order to generate the accessors for the members of the struct it complains with an error that it does not recognise the type of " [ "
>
> Does that mean that char arrays are other arrays are not supported as struct members or will I have to do this manually ?

-- 

Best regards,
Igor Stasenko.