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 ? 

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 ?