JNI - Getting a double array form Java

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Edsoncv - 17 Aug 2006 15:40 GMT

Hello
I'm trying (without sucess :( ) to get a double array form Java using
JNI.
My function (in C++) calls "CallDoubleMethod" but put trash in my "C"
double array. I'm doing somethig wrong but I don't know what. I check
the values from Java and it is being calculated perfectly, I think the
problem is in the array association (since I'm not a experienced
programmer). Below is my code.

jdouble *jacj = new jdouble[n];
....
get class
get method id
get object and so on...

*jacj = env->CallDoubleMethod(res_gradObj, getdataMetID);

I'm almost sure that the problem is in the last line. Can someone
please help me?
Thanks

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Edsoncv - 17 Aug 2006 15:42 GMT

I forgot to say that my function in Java returns a double array.
Thanks

> Hello
> I'm trying (without sucess :( ) to get a double array form Java using
[quoted text clipped - 16 lines]
> please help me?
> Thanks

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Gordon Beaton - 17 Aug 2006 16:31 GMT

> I'm trying (without sucess :( ) to get a double array form Java
> using JNI.

[...]

> *jacj = env->CallDoubleMethod(res_gradObj, getdataMetID);
>
> I'm almost sure that the problem is in the last line. Can someone
> please help me?

"Array of double" is not a primitive type. Use CallObjectMethod()
instead:

jdoubleArray jacj = CallObjectMethod(...);

/gordon

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[ don't email me support questions or followups ]
g o r d o n + n e w s @ b a l d e r 1 3 . s e

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Edsoncv - 17 Aug 2006 16:48 GMT

Ok, it worked. Thanks again.!! :)

> > I'm trying (without sucess :( ) to get a double array form Java
> > using JNI.
[quoted text clipped - 14 lines]
> [ don't email me support questions or followups ]
> g o r d o n + n e w s @ b a l d e r 1 3 . s e

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JNI - Getting a double array form Java

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