--- In
[hidden email], Peter Gummer <p-gummer@...> wrote:
>
> aschatte wrote:
>
> > How do I get the data associated with Reference or out parameters?
> > I have a DLL that uses these parameters liberally to reference data
> > from within the DLL to the calling object. It is used to control
> > hardware that I am using and I would like to control it from an
> > Eiffel object.
>
>
> According to:
>
>
http://docs.eiffel.com/book/platform-specifics/eiffel-net-limitations>
> "Eiffel does not have the notion of `byref' argument passing. At the
> moment, Eiffel for .NET cannot call nor can it redefine a feature that
> has a byref argument."
>
> The Eiffel .NET documentation looks very dated, however. That
> particular page mentions EiffelStudio 5.5, and on another page I saw a
> comment that .NET does not support generics, which isn't true. .NET
> 2.0 and higher has generics. So hopefully the limitation that I quoted
> above is no longer true either.
>
> - Peter Gummer
>
Thanks for the info, Peter. It would be good for me if Eiffel was able to work with 'byRef' parameters. In my case, I am trying to use Eiffel to interface to an existing component that I do not have control over.
I tried to reference a DLL function with 'byRef' parameters and it recognized the function defined in the vendor documentation as:
PICkitS.DLL:
public static bool Get_PickitS_DLL_Version(ref string p_version)
as:
PICkitS_Helper.e:
device.get_pickit_s_dll_version (p_version: TYPED_POINTER [detachable SYSTEM_STRING])
Is there a way to pull the ref string p_version data from the DLL using Eiffel?
Regarding this DLL, this is only the beginning as many other functions use 'byRef' parameters to pass the data. How can I get the data out of this DLL using Eiffel?
It appears that Eiffel at least begins to recognize the 'byRef' parameter as a TYPED_POINTER. I don't know how to use this type or how to de-reference it.
Thanks for your help.
