OpenEuphoria

Re: Sequence-Atom-DLL

• Posted by Elliott Sales de Andrade <quantum_analyst at hotmail.com> Jun 03, 2003
• 399 views

>From: Derek Parnell <ddparnell at bigpond.com>
>Subject: Re: Sequence-Atom-DLL
>
>
>On Mon, 02 Jun 2003 19:31:53 -0400, Robert Craig <rds at RapidEuphoria.com> 
>wrote:
>
>>
>>jbrown105 at speedymail.org wrote:
>>>On Mon, Jun 02, 2003 at 05:34:53PM -0400, Robert Craig wrote:
>>>>When calling a .dll routine that's written in Euphoria,
>>>>you can pass any kind of Euphoria data as arguments to
>>>>the routine, but you must declare the routine using
>>>>define_c_proc/func and the E_ types (E_INTEGER, E_ATOM, ...),
>>>>not the C_ types (C_INT, ...).
>>>>e.g.
>>>>fc = define_c_proc(lib, "File_Compress",
>>>>{E_SEQUENCE, E_SEQUENCE, E_SEQUENCE})
>>>>
>>>>c_proc(fc, {"infile.dat", "outfile.dat", {1,2,3}})
>>>
>>>Just wondering ... if i wrote a C program, and wanted to use an Eu .dll
>>>in it ... how would I call the Eu routine in the translated .dll, and how
>>>would I pass it the parameters?
>>
>>It's pretty easy as long as the Euphoria routine is
>>declared with integer parameters (only), and it returns
>>an integer as a result (if anything). It will look just like a
>>C routine that takes int's and returns an int.
>>A C program (after dynamically linking with the Euphoria .dll)
>>could pass int's, up to 31-bits in size and get back
>>a 31-bit int as a result. C and Euphoria agree on the meaning
>>of integers up to 31-bits. Anything else is incompatible.
>
>Just to clarify, does this also mean that 32-bit addresses might pose a 
>problem? And what about flags bits such as #8F12817F ?

If you want it to receive possible 32-bit values, try reading this: 
http://logicsoft.pcplayground.com/modules.php?name=FAQ&myfaq=yes&id_cat=3&categories=Euphoria+and+Other+Programming+Languages

>>Someone who studied the internal representation of sequences,
>>might be able to allocate and construct a sequence in C,
>>and pass it in, but that's definitely not for the
>>faint of heart.  
>>
>
>So normally we need to convert a sequence to some form of RAM structure and 
>pass an address instead? -- Derek
>
Can't help you there.