How to get bytes[] using jni functions

Question

I am new to JNI and have a question. I have a java class which returns back bytes[]
I have the class jclass for the object and the jmethodid bytesMethodID which is mapped like this:
bytesMethodID = (*env)->GetMethodID(env, objcls, "bytes", "()[B");
now in the c impementation I have a stuct pointer
DESIGN_STRUCT *str= NULL;
How do I assign the bytes[] into this struct pointer? If I do the following:
str = (*env)->CallObjectMethod(env, obj, bytesMethod());
I get a "assignment from incompatible pointer type" if I change that to:
str = (*env)->CallBytesMethod(env, obj, bytesMethod());]
I get a "assignment makes pointer from integer without a cast"
My question is what JNI function do i use to get back a byte[]
Any help and pointers greatly appreciated.
Thanks,

Answer 1

You should use CallObjectMethod() and cast the return value to a jbyteArray. Then you need to use a function like GetByteArrayElements() to actually retrieve the individual elements in that array.
God bless,
-Toby Reyelts
Check out the free, open-source, JNI toolkit, Jace - http://jace.reyelts.com/jace.