OpenEuphoria

Re: passing strings to .DLL calls --- (Help!)

• Posted by Daniel Berstein <daber at PAIR.COM> Jun 29, 1998
• 561 views

-----Original Message-----
De: JesusC - Jesus Consuegra <jconsuegra at REDESTB.ES>
Para: EUPHORIA at cwisserver1.mcs.muohio.edu
<EUPHORIA at cwisserver1.mcs.muohio.edu>
Fecha: lunes 29 de junio de 1998 18:51
Asunto: passing strings to .DLL calls --- (Help!)


>Robert, David, Pete, Daniel, Irv,... or any other expert in interfacing to
>windows .DLLs:
>
>A basic question on DLL interfacing:
>
>I see clearly that when I have to pass a "C" structure to a routine inside
a
>DLL, I have to allocate some memory space, and poke in the desired values.
>The same when I need to get some data from inside an structure.
>But, what does happen with sequences?. Are sequences equivalent to
>C_POINTER?.
>How should I pass a sequence to a .DLL string?. And backwards?.


You can't pass an Euphoria sequence just like that. But if you want to pass
a string, implemeted in Euphoria as a one dimension sequence, you can do it
easily by just allocating length(s)+1 bytes (s is your string) and poking to
the allocated memory your string, ending with a 0 (zero), that's why you
need to allocate +1 bytes ;)
You then give the dll functions the address of the allocated memory as the
parameter.

Regards,
    Daniel   Berstein
    daber at pair.com