[brailleblaster] Re: Another off-topic request for SWT information
- From: Michael Whapples <mwhapples@xxxxxxx>
- To: brailleblaster@xxxxxxxxxxxxx
- Date: Tue, 30 Aug 2011 22:39:00 +0100
I can answer some of your questions.
As far as I know, SWT is platform specific and requires a different JAR file
for each platform. Therefore I think you will need a different version for each
platform (including 32-bit and 64-bit).
It is not technically impossible to have libraries for multiple platforms in
one JAR, look at JNA (Java Native Access, can be found on java.net), but SWT
have worked their loading of libraries a little differently and so I think
would make it hard to have more than one set of DLLs in a JAR file. I would
have thought if it were possible with SWT, why have they not made a single SWT
jar file instead of one for each platform. This is one of the disadvantages of
SWT.
If you did not want to restrict yourself to a single executable jar file, then
you could have a batch file which works out what system it is running on and
starts java with the classpath set to include the correct SWT jar file for that
system. This then would mean you could make a single distribution and so have a
single download for users.
Also another note, you may know this anyway. I understand the SWT jar file
depends on the architecture the JVM is for, not whether the system is 32-bit or
64-bit.
Michael Whapples
On 30 Aug 2011, at 22:24, Richard Baldwin wrote:
> Thanks Chris,
>
> You have been a tremendous help to me on this project, and I have a few more
> questions if you can spare the time.
>
> 1. The labs at the college where I teach can't yet support 64-bit Java but my
> home computer can. So far, I haven't installed the 64-bit version on my home
> computer because I didn't have a need for 64-bit Java. Now I do have a need.
> Can the 32-bit version and the 64-bit version of Java peacefully coexist on
> the same Windows Vista Home Premium system? Some users of my program are
> running 64-bit Java and I need to upgrade my computer to act as a test
> platform for both 32-bit and 64-bit Java/SWT if possible.
>
> 2. I am experimenting for the first time with executable jar files. Can the
> 32-bit and 64-bit SWT DLL files be included in the same executable jar file,
> or will I need to create separate Jar files to support users who are running
> 32-bit Java and other users who are running 64-bit Java?
>
> On another note, I have posted a 32-bit executable jar file containing the
> prototype of my "Drawing Program for Blind Users" at the following URL. I
> expect to update it from time to time to add new features.
>
> http://www.austincc.edu/baldwin/SWT-SVG/SVGDraw01.jar
>
> I would appreciate hearing your comments and suggestions for improvement.
>
> Thanks,
> Dick Baldwin
>
> On Tue, Aug 30, 2011 at 2:27 PM, Chris von See <chris@xxxxxxxxxxxxx> wrote:
> Yes, it does. You can find all of the stable-release SWT downloads for all
> supported platforms and architectures at
> http://download.eclipse.org/eclipse/downloads/drops/R-3.7-201106131736/index.php#SWT
>
> Cheers
> Chris
>
>
> On Aug 30, 2011, at 12:17 PM, Richard Baldwin wrote:
>
>> Once again, this is off topic, but I know that this list is frequented by
>> SWT programmers. The last time I did this, I got some excellent information,
>> so I'll try again.
>>
>> Does SWT support 64-bit Java?
>>
>> If so, what is the download site for the 64-bit version of SWT?
>>
>> Thanks,
>> Dick Baldwin
>>
>> --
>> Richard G. Baldwin (Dick Baldwin)
>> Home of Baldwin's on-line Java Tutorials
>> http://www.DickBaldwin.com
>>
>> Professor of Computer Information Technology
>> Austin Community College
>> (512) 223-4758
>> mailto:Baldwin@xxxxxxxxxxxxxxx
>> http://www.austincc.edu/baldwin/
>
>
>
>
> --
> Richard G. Baldwin (Dick Baldwin)
> Home of Baldwin's on-line Java Tutorials
> http://www.DickBaldwin.com
>
> Professor of Computer Information Technology
> Austin Community College
> (512) 223-4758
> mailto:Baldwin@xxxxxxxxxxxxxxx
> http://www.austincc.edu/baldwin/
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