int array를 parameter로 넘겨기 예제(java->jni)
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java file
public class Test {
static {
System.loadLibrary("test");
}
public static void func1(
int arr[]) {
native_func1(core);
}
private native static void native_func1(int arr[]);
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cpp file
static void native_func1(JNIEnv* env, jobject obj,
jintArray arr) {
int size = env->GetArrayLength(arr);
jint *value = env->GetIntArrayElements(arr, NULL);
for (int i = 0; i <
size; i++) {
value[i] = i;
}
env->ReleaseIntArrayElements(arr, value, 0);
return;
}
static const JNINativeMethod g_methods[] = {
{ "native_func1", "([I)V", (void*)native_func1 },
};
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//배열 생성
int[] arr = new int[4];
//배열 전달
String array를 return value로 받기(jni->java)
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java file
static jobjectArray native_func2(JNIEnv* env, jobject obj) {
char *temp[4] = { "apple, "banana", tomato", "melon"};
jobjectArray ret = (jobjectArray)env->NewObjectArray(4, env->FindClass("java/lang/String"),
env->NewStringUTF(""));
for (int i = 0; i < 4; i++) {
env->SetObjectArrayElement(ret, i, env->NewStringUTF(temp[i]));
}
return ret;
}
static const JNINativeMethod g_methods[] = {
{ "native_func2", "()[Ljava/lang/String;", (jobjectArray*)native_func2 },
};
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java file
public class Test {
static {
System.loadLibrary("test");
}
public static String[] func2() {
return native_func2();
}
private native static String[] native_func2();
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String[] str = new String[4];
str = Test.func2();
