[Gvsig_english] JNI bindings and system binaries

[Rafael Gaitán]

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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