OpenEuphoria

Re: Testing atoms if pointer

• Posted by RStowasser Aug 16, 2010
• 1280 views

Currently I am experimenting with the Iup dlls and trying to wrap functions with variable arguments. Basically I am doing this in a similar way like this (a little bit simplified):

Ihandle* IupHbox(Ihandle *child, ...); [in C]

--constant hIupHbox = def_c_func(hIup, "IupHbox", {P}, P) 
object hIupHbox 
public function IupHbox(sequence child) 
    -- returns id of created element, or NULL if error 
    hIupHbox = -1 
    sequence c_args = {} 
    for x = 1 to length(child) do 
    	c_args &= P 
    end for 
 
    hIupHbox = define_c_func(hIup, "IupHbox", c_args, P) 
     
    Ihandle id_element = c_func(hIupHbox, child) 
    if id_element = NULL then crash("something wrong with IupHbox") end if 
    return id_element 
end function 

This is a relative simple example. But there are some functions in the Iup library in which case I am not sure if I always can use C_POINTER. So I wondered if there would be a simple check to see if an arguement in the sequence is a pointer or a value.

Roland