From: Dave Burt <dave@...>
Date: 2005-05-31T07:05:26+09:00
Subject: Re: WIN32API

"Park Heesob" <phasis@bcline.com> wrote...
> Hi,
> ----- Original Message ----- 
> From: "Dave Burt" <dave@burt.id.au>
>>
>> "Wolfgang" <wollez@gmx.net> wrote:
>>> Hello Brian,
>>>
>>> up to now I only have this in ruby:
>>>
>>> require 'Win32API'
>>> win = Win32API.new("dlltest.dll","DLL_WOOD",[],'L')
>>> somevalues = win.call()
>>> print somevalues
>>>
>>> the self made dll should return at the moment a fixed value (for
>>> testing).
>>> I tried this with an integer, than it works. As soon I define the
>>> variable
>>> in fortran as real, I get this nice numbers.
>>>
>>> Wolfgang
>>
>> Hi!
>>
>> The last parameter to Win32API.new is the type of the return value. If
>> your
>> DLL function returns a long integer, 'L' is correct. If you change the 
>> DLL
>> so that the function returns a float or a double, you will have to change
>> that last parameter to 'F' or 'D':
>>
> As far as I know,  You can't use 'F' or 'D' paramenter in Win32API.
>
> ...

You're right. I was thinking about Ruby/DL. Maybe, Wolfgang, you could use 
that instead:

# untested code
require 'dl'
dl = DL.dlopen = "dlltest.dll"
func = dl["DLL_WOOD", "D"]
somevalues = func.call
p somevalues

Hope this helps more that my last post :)
Cheers,
Dave