RE: Returning data from C functions called using "loadlib".

["Kevin Baca" <lualist@...>]

Multiple return values can achieve an equivalent result:

local a, b, c = 1, 2, 3
a, b, c = cfunction( a, b, c )


Alternatively, put the args in a table:

local t = { a = 1, b = 2, c = 3 }
cfunction( t )

-Kevin


> -----Original Message-----
> From: lua-bounces@bazar2.conectiva.com.br 
> [mailto:lua-bounces@bazar2.conectiva.com.br] On Behalf Of Rici Lake
> Sent: Monday, August 30, 2004 3:40 PM
> To: Lua list
> Subject: Re: Returning data from C functions called using "loadlib".
> 
> 
> If what you mean is:
> 
>    local a = 3
>    cfunction(a)
>    -- now a has magically become 5
> 
> Then you can't do it, in Lua or any sensible language ;)
> (Well, we all have our biases.)
> In Lua, all arguments are passed by value.
> 
> Do this:
> 
> a = cfunction()
> 
> 
> 
> On 30-Aug-04, at 5:32 PM, Aaron Newell wrote:
> 
> > Ok, I have a problem.
> >
> > I am calling functions in an external library that
> > i've written in C. I initalise this library using the
> > "loadlib" function in lua.
> >
> > I call these C functions fine, and pass data to them
> > fine.
> >
> > However what i want is to send data to the C functions
> > via params to the C functions (i can do this already),
> > then the C functions to manipulate that data so that
> > the original data passed from the lua script is
> > changed.
> >
> > I am really out of ideas.
> >
> > Thanks, I hope you can help,
> > Aaron
> >
> >
> > 	
> > 	
> > 		
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