java-dev

Hi Matthew,

your java source file Grabber.java that says it's in package  
edu.salk.snl.micrimap
must be located in the path src/edu/salk/snl/micrimap, _not_ directly  
in src/

Saba

Am 16.05.2008 um 02:06 schrieb Matthew Grivich:

> Hello Michael (and others),
>
>  This was the problem, though it took me some time to figure out.   
> The xcode project was using the default package.  The eclipse  
> project was not.  Woe unto me for changing two things at once.  I  
> had to change the C function names to this form:
>
> JNIEXPORT jint JNICALL  
> Java_edu_salk_snl_micrimap_Grabber_OpenCamera(JNIEnv *env, jobject  
> this, jstring cameraFilePathString)
>
> where the package is edu.salk.snl.micrimap, the class is Grabber,  
> and the method is OpenCamera.
> Of course in the process of fixing the eclipse build, I broke the  
> xcode build.  Does anyone know how to generate a java package in  
> xcode?  It should be trivial, but unfortunately it does not seem to  
> be.  Currently my file Grabber.java is in MainFolder/src/.  src is a  
> blue folder.  Yes, I did remember the
>
> package edu.salk.snl.micrimap;
>
> line at the top of the .java file.  It seems to be being ignored.
> Thanks.
>
> Matthew
>
> Michael Stringer wrote:
> > Matthew,
> >
> > Check that your headers and C functions are correct. Run 'javah' on  
> > the class that defines the native method calls to get what Java is  
> > looking for.
> >
> > Michael
> >
> > On 14 May 2008, at 20:46, Matthew Grivich wrote:
> >
> > > Hello All,
> > >
> > > I am attempting to write a frame grabber and camera control program
> > > for Macintosh.  The frame grabber in question uses a C api.  I have
> > > written a simple java wrapper for this using the java native  
> > > interface
> > > (JNI), entirely in Xcode.  However, Xcode does not have very good  
> > > Java
> > > support, so I'd like to write the Java portions of the program in
> > > Eclipse, and the C and java native interface portions in Xcode.  I  
> > > am
> > > using Xcode 3.0, OS 10.5.2, a dual processor G5, and Eclipse 3.3.2.
> > >
> > > First, I will say what works.  In Xcode: File -> New Project ->  
> > > Java ->
> > > Java JNI Application.  Makes jni version of hello world, works  
> > > fine.  I
> > > copy the generated headers folder and the .jnilib to a jnilib  
> > > folder in
> > > my eclipse project (EclipseTest/jnilib).  In eclipse: Right click
> > > project name (EclipseTest) -> properties -> source -> EclipseTest/ 
> > > src ->
> > > Set Native library location to EclipseTest/jnilib.  I copy the .java
> > > file from the Xcode project to the Eclipse Project src folder, by
> > > creating a new java file in Eclipse, and copy-pasting the text of  
> > > the
> > > file from Xcode.  Everything works.
> > >
> > > In Xcode:  I start with the jni hello world.  I add the C files  
> > > from the
> > > third party api.  I write the appropriate wrapper code to do some  
> > > simple
> > > operations with the camera (open, snap, and close) from java.  In  
> > > order
> > > to get things to link properly, I add a build phase to the JNILib
> > > target.  This build phase is Link Binary With Libraries.  Right  
> > > click
> > > this, then Add -> Existing Frameworks -> select the five necessary  
> > > third
> > > party frameworks.  These frameworks are located in /Library/ 
> > > Frameworks.
> > > This all works.
> > >
> > >
> > > Now, I will get to what doesn't work.  I transfer camera .jnilib and
> > > headers folder over to an eclipse project.  When I try to run it,  
> > > I get
> > >
> > > Started application
> > > Exception in thread "main" java.lang.UnsatisfiedLinkError:  
> > > OpenCamera
> > >  at edu.salk.snl.micrimap.Grabber.OpenCamera(Native Method)
> > >  at edu.salk.snl.micrimap.Grabber.main(Grabber.java:80)
> > >
> > > When I don't make the jnilib available, it gives
> > >
> > > Exception in thread "main" java.lang.UnsatisfiedLinkError: no  
> > > Grabber in
> > > java.library.path
> > >  at java.lang.ClassLoader.loadLibrary(ClassLoader.java:1753)
> > >  at java.lang.Runtime.loadLibrary0(Runtime.java:822)
> > >  at java.lang.System.loadLibrary(System.java:993)
> > >  at edu.salk.snl.micrimap.Grabber.<clinit>(Grabber.java:25)
> > >
> > > So I know that it is finding the .jnilib.
> > >
> > > My belief is that it is not finding the third party frameworks.
> > > However, I have not found the "make it work" button.  Any assistance
> > > would be much appreciated.
> > >
> > > Thanks.
> > >
> > > Matthew
> > >
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