OpenEuphoria

Re: Rob: Q: Constant Scope

• Posted by "Juergen Luethje" <j.lue at gmx.de> Apr 24, 2005
• 540 views

Matt Lewis wrote:

> Juergen Luethje wrote:
>>
>> I translated the most simple sample DLL that I could think of, using
>> the official Eu 2.5 translator (compiled with Borland and Watcom) on
>> Windows 98:
>>
>> ------------[ file mydll.ew ]------------
>> }}}
<eucode>
>> global integer foo
>> foo = 123
>> </eucode>
{{{

>> -----------------------------------------

<snip>

> You need to change the declaration for foo.  In main_.h, you should see
>
>    extern int _1foo;
>
> Change this to:
>
>    extern _declspec(dllexport) _1foo;
>
> Now you should be able to:
> }}}
<eucode>
>    lpFoo = define_c_var(lpLib, "__1foo")
> </eucode>
{{{

> Note that bcc adds an extra underscore.  I don't think bcc allows you to
> put variables into the def file, so you seem to be stuck with the ugly
> name.  I haven't tried with any other compilers.

That works fine, thank you!
Well, the ugly name isn't a big issue for me, since it's only used once
in the define_c_var() function.

Now I know the reason for my previous confusion. I had assumed that the
translator automatically exports global variables from a DLL. Now I've read
the docs and saw, that this obviously isn't the case.

Thanks,
   Juergen