IupGetAllClasses
Returns the names of all registered classes.
Parameters/Return
int IupGetAllClasses(char** names, int max_n);names: table receiving the names. Only the list of
names needs to be allocated. Each name will point to an internal
string.
max_n: maximum number of names the table can
receive.
Returns: the actual number of names loaded to the table or -1 (nil) if class not found. If names==NULL or max_n==0 or -1 then returns the maximum number of names.