1. QWORD (int64) question
I think I asked this before, but I would like to know how to get return
values that are QWORD's. Someone said that QWORD's are pointers, but they
are not. When passing QWORD's they use two INT's in VB, so it is definitely
not 32 bits. I am guessing that I would have to use ASM to do this. From my
limited knowledge of 16-bit assembler, I happen to know that return values
that were 32 bits (which was not as usual, of course) were in DX:AX. So, I'm
guessing that in 32-bit assembly a 64-bit value would be returned in
EDX:EAX. Any help would be appreciated.
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2. Re: QWORD (int64) question
Elliott Sales de Andrade writes:
> I think I asked this before, but I would like to know how
> to get return values that are QWORD's. Someone said
> that QWORD's are pointers, but they are not. When
> passing QWORD's they use two INT's in VB, so it is definitely
> not 32 bits. I am guessing that I would have to use ASM to do this.
I think you can probably *pass* 64-bit integers by
passing two consecutive 32-bit arguments.
They'll be pushed on the call stack.
Be careful to get them in the right order.
As for receiving a 64-bit integer as a result,
I don't know what the C calling convention is for that.
As a wild guess, unlikely to work, but maybe worth a shot,
you could try declaring (via define_c_func()), the return
value as C_DOUBLE, and then recover the 8 bytes that
are returned using atom_to_float64(). I think doubles
are returned in a floating-point register, so they'd have to
return the 64-bit integer in the same register, which isn't too likely.
More likely, they use two 32-bit registers. You'd have to
maybe disassemble some compiled C code to get the answer,
and then use some machine code similar to Matt Lewis' DLL code.
Regards,
Rob Craig
Rapid Deployment Software
http://www.RapidEuphoria.com
