22 messages in net.java.dev.rococoa.usersRe: BOOL mapping issues| From | Sent On | Attachments |
|---|---|---|
| Harald Kuhr | Feb 9, 2010 11:58 am | |
| Duncan McGregor | Feb 9, 2010 12:04 pm | |
| Harald Kuhr | Feb 9, 2010 12:27 pm | |
| Harald Kuhr | Feb 9, 2010 12:37 pm |  .java |
| Duncan McGregor | Feb 10, 2010 12:37 am | |
| Harald Kuhr | Feb 10, 2010 2:39 am | .java |
| Harald Kuhr | Feb 17, 2010 7:25 am | |
| Duncan McGregor | Feb 18, 2010 1:56 am | |
| Andrew Thompson | Feb 18, 2010 6:52 pm | |
| Harald Kuhr | Feb 19, 2010 6:49 am | |
| Harald Kuhr | Feb 19, 2010 7:23 am | |
| Harald Kuhr | Feb 19, 2010 10:37 am | |
| Harald Kuhr | Feb 19, 2010 12:13 pm | |
| Duncan McGregor | Feb 19, 2010 2:04 pm | |
| Harald Kuhr | Feb 19, 2010 3:06 pm | |
| Andrew Thompson | Feb 20, 2010 8:02 am | |
| Harald Kuhr | Feb 20, 2010 1:12 pm | |
| Andrew Thompson | Feb 20, 2010 5:22 pm | |
| Duncan McGregor | Feb 21, 2010 2:55 am | |
| Harald Kuhr | Feb 21, 2010 8:14 am | |
| Duncan McGregor | Feb 21, 2010 8:40 am | |
| Duncan McGregor | Feb 21, 2010 9:01 am |
| Subject: | Re: BOOL mapping issues | |
|---|---|---|
| From: | Duncan McGregor (dun...@oneeyedmen.com) | |
| Date: | Feb 21, 2010 8:40:13 am | |
| List: | net.java.dev.rococoa.users | |
On 21 Feb 2010, at 16:15, Harald Kuhr wrote:
1 - Pick a mapping and stick to it. So Java boolean (actually Boolean by the
time we get to the invocation) always maps to int32 with 1 = YES, 0 = NO.
Strictly, BOOL and bool (stbool.h) are both typedef'ed as signed char, I guess
that is a java.lang.Byte in Java. But I figured it didn't make any difference,
as the only values ever used are 0 and 1 and JNA does the magic in any case.
Just goes to show how much we depend on JNA - I'd never even looked to see what
the mapping was - just assumed it would all be alright.
...
Hmm.. I did a quick google for boolean types, and it seems that 1 is the most
common way to represent true (see for example
http://en.wikipedia.org/wiki/Boolean_data_type), even though I'm sure they
tought me -1 was the best representation at the university..
Same here, something about -1 allowing logical operations by arithmetic.
Given 1 is the standard in all C variants, it is a little strange that JNA
would choose -1.
I'll do a few experiments and maybe ping Timothy
Duncan