OpenEuphoria

Re: Euphoria DLLs

• Posted by Juergen Luethje <j.lue at gmx.de> Apr 20, 2003
• 485 views

Hello Rob,

thanks for your reply. You wrote:

> Juergen Luethje wrote:

[...]

> Things are guaranteed to work if 31-bit integers are
> passed. If a 32-bit integer is passed in from C,
> things might still work (all the time),
> depending on what you do with that value.

The 32 bit values that are passed in from the main
program [1] to my DLL are memory addresses, that the
DLL code uses for peek()ing and poke()ing.

> You would have to examine the
> C code generated by the Translator in each case
> to determine if 32-bits will work.

What rules shall I use to make such decisions?
Unfortunately, I almost don't know anything about C
programming.

> If necessary, you could code your own little C
> routine, and make that the entry point to
> your .dll. It could then handle any 32-bit arguments,
> before calling one of your Translator-generated routines.
> In general, it could simply convert each C 32-bit integer
> into a Euphoria atom (C double) with one C statement.

Maybe you (or someone else) could give me a template or
an example how to do this?

>> How big are the chances that a future version
>> of the translator will create DLLs (and SOs)
>> that exchange 32-bit integer values with C programs?
>
> It depends on how many people need this.
> So far I haven't seen many people wanting to call
> Euphoria .dll's from C.

If Euphoria could produce industry standard DLLs, I
think it also could be for instance very useful for
Visual Basic programmers to use a DLL created with
Euphoria to speed up critical parts of their code.

TIA, and best regards,
   Juergen