JNI wrapper for NSSavePanel

[Mike Swingler]

On Oct 6, 2012, at 3:11 PM, Michael Hall <mik3hall at gmail.com> wrote:

> On Oct 6, 2012, at 4:08 PM, Steve Hannah wrote:
> 
>> I have posted source for both versions of the method at
>> https://gist.github.com/3846116.
> 
> How about throwing a retain on path and see if it makes a difference?

The "path" is not an Obj-C object, it's a JNI jstring pointer, you can't retain it.

I'd actually recommend using JNFNSToJavaString(), instead of manually fetching out the UTF8String and then using the raw JNI.

JNF_COCOA_ENTER/EXIT do more than just setup an autorelease pool - they also catch ObjC exceptions and re-throw them as Java runtime exceptions.

Do you have the backtrace of where you are crashing when using JNF_COCOA_ENTER/EXIT?

Also, are you doing anything special to run this JNI method on the main AppKit thread (or are you using SWT)? If not, you may want to use +[JNFRunLoop performOnMainThreadWaiting:withBlock:], which will block the current thread, run your block on the main thread (safe for AppKit), and then continue execution of your Java thread when the block returns.

Just a few thoughts,
Mike Swingler
Apple Inc.