[Gvsig_english] JNI bindings and system binaries

[Benjamin Ducke]

Hi Rafa,

I have a question regarding the libjni-proj4 project.
The src folder does not only have the JNI bindings but
actually the entire PROJ.4 library source code. Why?
And where does this code come from? I downloaded the
latest PROJ.4 release 4.7.0 and the code differs.

E.g., in libjni-proj4, geocent.c, I find this comment:

* $Log: geocent.c,v $
 * Revision 1.5  2004/10/25 15:34:36  fwarmerdam
 * make names of geodetic funcs from geotrans unique

... which does not exist in the same file of PROJ.4 4.7.0.

So where does the C code in libjni-proj4 come from?

Thanks,

Ben

----- Original Message -----
From: "Rafael Gaitán" <gvsig3d at ai2.upv.es>
To: "gvsig internacional" <gvsig_internacional at listserv.gva.es>
Sent: Monday, January 18, 2010 8:45:54 PM GMT +01:00 Amsterdam / Berlin / Bern / Rome / Stockholm / Vienna
Subject: Re: [Gvsig_english] JNI bindings and system binaries

El 18/01/10 20:05, Benjamin Ducke escribió:
> Hi Rafa,
>
> Thanks for your clarifications. I think I have a good
> idea of what I need to do now. I am hesitating to use
> Visual C because I don't want to sacrifice gigabytes
> of disk space just to get some C code compiled and I
> absolutely loath the semantics of cmd.exe and all those
> MS development tools. So I might adapt those CMake files
> to run MingW/GCC instead.
>    
CMake is a very useful tool. It can generate Unix/Mac/Mingw Makefiles 
and Visual Studio Project files, so I think mingw generation will be 
quite straighforward.
> Some build notes would be helpful, though.
>
> I will let you know if I run into another problem or
> in the unlikely case that I figure something out which
> you didn't know before!
>    

It's ok! :)

Greets,
Rafa.

> Best,
>
> Ben
>
> ----- Original Message -----
> From: "Rafael Gaitán"<gvsig3d at ai2.upv.es>
> To: "gvsig internacional"<gvsig_internacional at listserv.gva.es>
> Sent: Monday, January 18, 2010 6:58:52 PM GMT +01:00 Amsterdam / Berlin / Bern / Rome / Stockholm / Vienna
> Subject: Re: [Gvsig_english] JNI bindings and system binaries
>
> Hi Ben,
>
> I'm Rafa again! :)
>
> El 18/01/10 16:20, Benjamin Ducke escribió:
>    
>> Dear all,
>>
>> I am currently looking into how to compile binaries and JNI
>> wrappers for platform-dependent binaries (GDAL,PROJ.4, etc.).
>> I have some questions:
>>
>> 1. I am a bit unsure whether to use the JNI bindings from
>> trunk or the 3D extension' versions. Are those version
>> going to be merged into trunk again sometime soon?
>> Does the current trunk version already support GDAL 1.6.3?
>>
>>      
> I don't know if will be merged, but probably will, because I fixed some
> JNI errors that doesn't affect to functionality.
>
> If you want compile jni bindings by yourself, I recommend you use the
> fixed versions (3D branch) but by now they are not oficial!.
>
> Trunk version I'm sure is not compiled against GDAL 1.6.3. Binaries from
> 3D branch are built against that version using Visual Studio 2008 SP1.
>    
>> 2. What's in the "libjni-addo" project? The same bindings
>> also seem to be in "libjni-gdal/main/java/org/addo"?
>>
>> 2. If I look into ""libjni-gdal/main/java/org/gvsig/jogr", I see
>> OGR vector data driver functions in there. Is this what
>> gvSIG currently uses to manage shapefiles? Or is this just
>> some experimental code?
>>
>> 3. The compilation instructions for jgdal, jmrsid etc.state
>> that Visual C is needed on Linux.
>> Is that because the native libraries  were also compiled
>> using Visual C? Or is there another reason?
>> I am asking because I'd like to compile everything with MinGW.
>> If I have to use Visual C: which version and is there a free
>> version available?
>>
>>      
> If you want compile on windows I think you can download a free version
> of the visual studio from microsoft web page, but make sure that *all
> your native libraries* are built with the same compiler. If you mix
> visual studio versions probably will give you crashes, because of mixing
> c++ runtime versions. JNI world is not as funny as Java! hehe.
>    
>> 4. Regarding Mac OS X, I noticed that there are some Mac specific
>> projects in trunk: libjni-gdal-macosx, libjni-mrsid-macosx, ...
>> Are those still needed on the Mac?
>>
>>      
> If you use the 3D branch, they are not needed. Currently we are using
> CMake for multiplatform building. So only some basic knowledge of CMake
> is needed.
>
> We probably upload a BUILD_NOTES.txt to each jni project on the branch
> with a simple guide.
>
> Another problem that Agustin said is that I was not able to generate
> correctly ecw and mrsid libraries for MacOSX.
>
> ECW compiles and should work... but once you try to load a file it gives
> an exception and aborts the process :(. MRSID doesn't compile at all, I
> have the requested SDK but the build process gives some linkage
> problems. If you find a solution to the problem I will very pleasead to
> upload the changes to the 3D branch.
>
> Rafa.
>    
>> Any help will be much appreciated!
>>
>> Best regards,
>>
>> Ben
>>
>>
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