Unary &~

[BestCoder]

How do I find the address-of the one's complement of 15 (&~15 (C++ code)) in VB? At least I think that's how it is said.

Thanks

[jim mcnamara]

I know C, but I'm finding that people asking for C stuff out of context means that I usually give a bad answer.

Post the code you got this from.

To answer your question -

Dim a as long
a = 15
z = varptr(a)

z is now a pointer to a
If this is for a function call, pass z ByVal.

I'm not sure how to do a one's complement with VB.

[BestCoder]

Here is the code:

bmp.bmWidthBytes = ((bmp.bmWidth + 15) &~15)/8;

And I saw somewhere were perhaps a one's complement can be acheived some how with Not?

Thanks

[jim mcnamara]

Oh. That's what I thought.

((bmp.bmWidth + 15) &~15)/8;

should be:
((bmp.bmWidth + 15) &  ~15)/8;
which is
( bmp.bmwidth + 15)  and  one's complement of 15
not the address of.

You are right, not does give one's complement, except in VB I"ve gotten wierd results. If you want to assume not will work-- this is your code:

 dim i as long
 i=   (bmp.bmwidth + 15)  and ( not 15)
 i = i/8
 bmp.bmWidthBytes = i