OpenEuphoria

Re: Where is my DLL?

• Posted by "Juergen Luethje" <j.lue at gmx.de> Oct 19, 2005
• 532 views

Robert Craig wrote:

> Juergen Luethje wrote:
>>
>> Me wrote:
>>
>> [How can a DLL written in Euphoria get its own instance handle?]
>>
>> <snip>
>>
>>> Now I've found a (hopefully correct) way to fetch the value of
>>> [the first parameter of DllMain()/LibMain()] so that I can use
>>> it in my Eu DLL.
>>> I wrote the following small include file:
>>>
>>> --------------------------[ dll_instance.e ]--------------------------
>>> }}}
<eucode>
>>> atom DLL_Instance
>>> -- DLL_Instance = 0             -- Initialize the variable only when
>>>                                 -- testing the program with the
>>>                                 -- interpreter, *not* when compiling
>>>                                 -- to a DLL!
>>> global function dll_instance()
>>>    return DLL_Instance
>>> end function
>>> </eucode>
{{{

>>> ----------------------------------------------------------------------
>>>
>>> I include this file in the code of my DLL, and after translation,
>>> in the file "main_.c" I add something like
>>>
>>>     _2DLL_Instance = hDLL;
>>>
>>> as the first line to either DllMain() or LibMain().
>>> When dll_instance.e is not the 1st but the 2nd included file, then
>>> the number must be not 2, but 3 etc. A small Eu program does it for me.
>>>
>>> This seems to work fine so far. Unfortunately, I always have to
>>> uncomment the line in the include file that initializes the variable
>>> 'DLL_Instance', before I can run the code with the interpreter.
>>
>> <snip>
>>
>> Rob, I just thought that I'd sleep better if you could confirm that I'm
>> not doing something potentially dangerous here. 
>
> I'm not sure. If hDLL is greater than a 31-bit integer
> there will be trouble, since Euphoria requires it to be
> stored in floating-point form. You might need to call
> my C routine NewDouble() to create a proper Euphoria atom
> in floating-point form.

I see, thanks. Unfortunately, I don't know how to do so. 
Matt, can I use make_atom() in this situation, or is it "only" for
parameters?

Regards,
   Juergen

-- 
Have you read a good program lately?