OpenEuphoria

RE: .dll files -- possibly [OT]

• Posted by Andy Serpa <ac at onehorseshy.com> Jul 17, 2003
• 453 views

Chris Saik wrote:
> 
> 
> Thanks Andy. So are .dlls "included", or do you just
> place the .dll in the \windows\system\ directory and
> call the functions directly?  I would imagine the
> latter, since you state that other languages can
> access .dlls written in most any language (with the
> possible parameter restrictions, of course) and
> without revealing the source code. 
> 
> 
Yeah, you've got to "link" the functions in the dll with your program by 
using open_dll(), define_c_func() & define_c_proc() (see REFMAN).  Then 
you call the functions with c_func() or c_proc().  Sometimes other 
overhead needs to be done to send the parameters properly (poking a 
character string into memory with allocate_string(), for instance).  
This process is known as "wrapping" the .dll -- making a "wrapper".  
(Search the archive with the word wrapper and you'll find some.)

Using a Euphoria-created .dll is a lot simpler than using one made in a 
different language where you'll generally need a bit of knowledge about 
C to figure out how to wrap it properly...