Passing jCharArray back to Java from C library

Question

Hi
I need help with my JNI implementation where I need the C method to return a jcharArray, not a jstring (I dont want the array null terminated). Here is my code:
JNIEXPORT jcharArray JNICALL Java_lpi_crv_ltoApiWrapper_ltoGetResponse
(JNIEnv *env, jobject obj)
jcharArray jc;
jchar cArr; / debug only */
printf("%s\n",response);
jc=(*env)->NewCharArray(env,actualLength);
(*env)->SetCharArrayRegion(env,jc,0,actualLength,(jchar*)response);
cArr=(*env)->GetCharArrayElements(env,jc,0); /* debug only */
printf("%s\n",(char *)cArr); /* debug only */
(*env)->ReleaseCharArrayElements(env,jc,cArr,0); /* debug only */
return (jc);
response is a public char array.
This code seems to return a series of ? in my calling java app, yet the conversion of the jc variable back to a char array (the debug only lines) seems to output the correct values. What am I doing wrong?

Answer 1

jchar is 16 bit (unsigned) while char (of C) is 8 bit.
Try to use a jbyteArray instead of jcharArray.