Re: [sdljava-users] JNI pitfall

[Ivan Z. G. <iva...@ya...>]

Thanks for this info.  Once I get a FAQ going I'll be certain to mention 
it there.

This is making me think that inside SDLMixer we might want to keep a 
reference to whatever is being played until its finished playing.  Once 
you say playMusic and pass in the song we shouldn't allow the garbage 
collector to scoop it up.  I think this could happen once the callbacks 
are implemented. 

Any suggestions appreciated...

-Ivan/

Robert Schuster wrote:

> Hi list,
> I was writing on a small demo app which at some place included these 
> lines:
>
> if (!measureFPS) {
>            SDLMixer.openAudio(44100, SDLMixer.AUDIO_S16SYS, 2, 2048);
>
>            System.out.println("Loading song.");
>
>            MixMusic song = SDLMixer.loadMUS(Thread.currentThread()
>                    .getContextClassLoader()
>                    .getResourceAsStream("memesong.ogg"));
>
>            System.out.println("Playing song: " + song);
>            SDLMixer.playMusic(song, 0);
> }
>
> The code does not look very special but at runtime something odd will 
> happen: You will hear a small bit of music and then it stops. The 
> reason for this is that the MixMusic instance 'song' gets garbage 
> collected when the if-block ends. I describe this here because this 
> behavior is caused by the way Swig handles native pointers and can be 
> a pitfall for others as it was for me.
>
> You can work around this problem by assigning an instance like 
> MixMusic (which in the above example is a local variable) to an 
> instance or class variable.
>
> @Ivan: If you are going to write a FAQ for SDLJava sometime it would 
> be good to add this issue to it.
>
> cu
> Robert
>
>
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