jni send byte array to java

以你之姓@ 2022-05-31 02:51 231阅读 0赞

JNIEXPORT jobjectArray JNICALL
Java_ArrayHandler_returnArray
        (JNIEnv *env, jobject jobj){
    jobjectArray ret;
    int i;
    char *message[5]= {
  "first",
                       "second",
                       "third",
                       "fourth",
                       "fifth"};
    ret= (jobjectArray)env->NewObjectArray(5,
                                           env->FindClass("java/lang/String"),
                                           env->NewStringUTF(""));
    for(i=0;i<5;i++) {
        env->SetObjectArrayElement(
                ret,i,env->NewStringUTF(message[i]));
    }
    return(ret);
}

JNIEXPORT jintArray JNICALL 
Java_ArrayTest_initIntArray(JNIEnv *env, jclass cls, int size) {
    jintArray result;
    result = env->NewIntArray(size);
    if (result == NULL) {
        return NULL; /* out of memory error thrown */
    }
    int i;
    // fill a temp structure to use to populate the java int array
    jint fill[size];
    for (i = 0; i < size; i++) {
        fill[i] = 0; // put whatever logic you want to populate the values here.
    }
    // move from the temp structure to the java structure
    env->SetIntArrayRegion(result, 0, size, fill);
    return result;
}