define_c_func/proc and 64-bit return types

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  • Posted by ghaberek (admin) Jul 29, 2012
  • 1410 views

I'm trying to wrap a function that returns a int64_t value.

I know I can pass int64_t as a long long via two C_LONG values: 

procedure some_routine( atom param ) 
    atom hi_dword = and_bits( param / #100000000, #FFFFFFFF ) 
    atom lo_dword = and_bits( param, #FFFFFFFF ) 
    c_proc( xsome_routine, {lo_dword,hi_dword} ) 
end procedure

But how (or can) I do the reverse?

It would be nice if I could declare the function like this: 

constant xsome_routine = define_c_func( somelib, "some_routine", {}, {C_LONG,C_LONG} )

And then get back {lo_dword,hi_dword} when I call the function.

Although I suppose the best declaration would simply be: 

constant xsome_routine = define_c_func( somelib, "some_routine", {}, C_LONGLONG )

-Greg

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