I have byte array in java class , and i want to pass that byte array to JNI C class, I am not able to access that array in JNI C, please help.
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1 Answer
you need to declare the JNI function that receives the array like this (in Java):
private native void sendData(byte[] data);
you call the function like any other function:
sendData(buffer);
and then in your C code implement the function like this:
JNIEXPORT void JNICALL Java_com_packageXXX_yourClass_sendData( JNIEnv* env, jobject thiz, jbyteArray data);
read the array:
byte * cData = env->GetByteArrayElements(data, &isCopy);
and release:
env->ReleaseByteArrayElements(data, cData, JNI_ABORT);
the above code is C++. To make it work for C you need to pass the jni environement (env) as the first parameter of the function you are calling, like this:
(*env)->GetByteArrayElements(env,...)
8 Comments
Deepak
Thanks for great answer, But i have one problem, Method 'GetByteArrayElements' could not be resolved,,, how to remove this error???? its always shown to me when i try to use env methods??
Deepak
env->ReleaseByteArrayElements(data, cData, JNI_ABORT); also could not resolved
Traian
if you are using plain C then you need (*env)->GetByteArrayElements(env, array, isCopy). Check out this link: docs.oracle.com/javase/7/docs/technotes/guides/jni/spec/…
Deepak
i get the reference of this method in jni.h , but although "GetByteArrayElements" error is showing
Traian
right now I have this in my code and it works perfectly: short * cData = (short*)env->GetShortArrayElements(data, &isCopy); Looking at the functions listed in the link above, GetByteArrayElements() is also available. Are you sure that the array passed to the function is a jbyteArray? Are you writing C or C++ code?
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