return a float array from java to jni

Question

I'm calling a java method from jni.This method return a float[]

   jclass javaClass = env->GetObjectClass(activityObj);
   jmethodID method = env->GetMethodID(javaClass,"findparam", "([FF)F");
   jfloatArray rotateArray = env->CallFloatMethod(activityObj, method, s1, s2);

But when i tried to compile it i had :

   error: cannot convert 'jfloat' to '_jfloatArray*' in initialization

how can i get the returnet float array??

i think i found it :Use CallObjectMethod. For example: jmethodID myMethod = (*env)->GetMethodID(myClass, "myMethod", "()[I"); jintArray retval = (jintArray) (*env)->CallObjectMethod(myObject, myMethod); — Dev DOS
– Dev DOS, Commented Apr 15, 2013 at 14:51

Dev DOS · Accepted Answer · 2013-07-11 12:01:48Z

1

Just try to use jfloatArray imageArray = (jfloatArray) env->CallObjectMethod(Object,method); It should resolve your problem .

edited Jul 11, 2013 at 12:01

Dev DOS

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answered Jul 11, 2013 at 11:48

Sondes Sassou

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GooseSerbus · Accepted Answer · 2013-04-15 21:22:32Z

0

All array types (even primitive types) are returned as a jobject which you should then cast to the appropriate j<type>Array type.

So your final line should read:

jfloatArray rotateArray = (jfloatArray)env->CallObjectMethod(activityObj, method, s1, s2);

answered Apr 15, 2013 at 21:22

GooseSerbus

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user207421 · Accepted Answer · 2013-04-16 01:38:26Z

0

CallFloatMethod() is for calling methods that return float. You are calling a method that returns float[]. You should be calling CallObjectMethod().

answered Apr 16, 2013 at 1:38

user207421

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