[Chicken-users] XLib egg question

[William Ramsay]

Hi,

I'm trying to use the XLib egg, which brings up a very basic question.   
How do I get back a value embedded in an XLib function call.  For 
instance, take xallocnamedcolor.    The call is  (xallocnamecolor 
display colormap name sreturn exact).   The results in C are placed in  
the pointers "sreturn" and "exact".    How is this handled in Scheme?    
Both are defined as C-Pointer types.

Bill