Converting Java Boolean array to C++ bool array

Question

I am trying to convert a boolean array being passed to C++ from Java into just a bool array. However, regardless of what the boolean value is, it is always evaluated to true because the value is a number greater than 0. My latest attempt code is:

jint capsLen = env->GetArrayLength(capabilities);
if (capsLen <= 0)
{
  print error;
  return;
}

bool capsArray[capsLen];
jboolean *getbool = env->GetBooleanArrayElements(capabilities, NULL);
for (int i = 0; i < capsLen; i++)
  capsArray[i] = (bool)getbool[i]

I have also tried:

jboolean getbool[1];
bool capsArray[capsLen];

for (int i = 0; i < capsLen; i++)
{
    env->GetBooleanArrayRegion(capabilities, i, 1, getbool);
    capsArray[i] = getbool;
}

Both bits of code gives the getbool variable an integer value greater than 1.

I am not quite sure what I am doing wrong, and cannot seem to find any example code online that works (that is if I can find anything at all). How am I supposed to rip boolean values from a jbooleanArray passed from Java into a bool array in C++?

Also, in case someone suggests it, I cannot use an integer array instead of a boolean array because the Java code HAS to have the information as booleans.

EDIT: @sigpwned For the first code block, an example of the returned values (using printf("%d", getbool[i])):

208, 160, 155, 65, 248, 106, 154, 65, 248, 106, 154, 65

It should be noted that these numbers are not always consistent.

EDIT: The provided boolean values are:

F, T, T, F, F, F, T, F, T, F, T, T

EDIT: Full function code

JNIEXPORT bool JNICALL Java_com_NativeClient_Login(JNIEnv *env, jobject, jstring userJ, jstring passJ, jstring serJ, jboolean useJ, jstring resJ, jbooleanArray capabilities)
{
  LOGI("%s", __PRETTY_FUNCTION__);
  if (cst_ == NULL) {
    LOGE("cst is not initialized");
    return false;
  }

  std::string user = env->GetStringUTFChars(userJ, NULL);
  std::string pass = env->GetStringUTFChars(passJ, NULL);
  std::string ser = env->GetStringUTFChars(serJ, NULL);
  std::string res = env->GetStringUTFChars(resJ, NULL);
  jint capsLen = env->GetArrayLength(capabilities);
  if (capsLen <= 0) {
    LOGE("Provided capabilities array is empty or negative or errored");
    return false;
  }

  bool capsArray[capsLen];
  jboolean *getbool = env->GetBooleanArrayElements(capabilities, NULL);
  LOGE("sizeof(getbool): %d", sizeof(getbool));  // Returns: 4
  for (int i = 0; i < capsLen; i++) {
    capsArray[i] = (getbool[i] == JNI_TRUE);
    LOGE("capsArray[%d]: %d", i, capsArray[i]); // All zero
    capsArray[i] = !(getbool[i] == JNI_FALSE);
    LOGE("capsArray[%d]: %d", i, capsArray[i]);  // All one
  }

  if (!cst_->SetCapabilitiesArray(capsArray, capsLen)) {
    LOGE("Error is setting capabilities array, most likely it is a length mismatch");
    return false;
  }

  cst_->SetUserInfo(user, pass, ser, useJ, res);
  return true;
}

Answer 1

So the problem was not with the C++ side of code, but my lack of knowledge of Java and stubbornness to ask the Java people for help.

It turns out that I was building and passing my function a Boolean caps[] instead of a boolean caps[].