JNI: Transforming primitive types

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Marcelo - 19 Jan 2006 22:47 GMT

Hi everybody,

I would like to know if there is simple way in JNI to pass a float** in c++ to a
jobjectArray.

should I first search the jclass element, then creating the NewObjectArray and
at the end, coping all the c++ float-elements to the jobjectArray?

is there a simplest and low ressource-consuming way?

thanks a lot,

Marcelo

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Gordon Beaton - 20 Jan 2006 08:00 GMT

> I would like to know if there is simple way in JNI to pass a float**
> in c++ to a jobjectArray.
[quoted text clipped - 4 lines]
>
> is there a simplest and low ressource-consuming way?

Except for the fact that a float array is a more suitable structure
for holding floats than an Object array is, you've described an
appropriate method. What problems are you having?

/gordon

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Marcelo - 21 Jan 2006 10:37 GMT

hi,
my problem is that i don't understad if this senteces is OK:

float *vectA; //Some values inside vectA
...
jfloatArray jarr; //After initialize jarr with float class
...

(*env)->SetIntArrayRegion(env, jarr, 0, 100, vectA);

does it work?

Is there any problem passing floats in c to the jfloats in Java?

Should I do any conversion as we do in Strings?

thanks a lot,

Marcelo

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Gordon Beaton - 23 Jan 2006 06:57 GMT

> my problem is that i don't understad if this senteces is OK:

Are you having specific problems, or are you just wondering?

> float *vectA; //Some values inside vectA
> ...
[quoted text clipped - 8 lines]
>
> Should I do any conversion as we do in Strings?

If you want to store floats in a float (not Float) array, pass vectA
to SetFloatArrayRegion (*not* SetIntArrayRegion). Note that float is
not, as you imply, a class.

/gordon

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JNI: Transforming primitive types

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