C++ std::string to jstring with a fixed length

Question

I\'m trying to turn a C++ std::string into a jstring and return it. This would be easy enough with

JNIEnv*->NewStringUTF(stdString.c_str())

Answer 1

I made my own workaround solution taking RedAlert's advice.

Java now expects a byte[] from the native call:

private native byte[] toString(long thiz);

The toString method now calls this method inside it on a std::string:

jbyteArray StringToJByteArray(JNIEnv * env, const std::string &nativeString) {
    jbyteArray arr = env->NewByteArray(nativeString.length());
    env->SetByteArrayRegion(arr,0,nativeString.length(),(jbyte*)nativeString.c_str());
    return arr;
}

And the java level receives the data like this:

byte[] byteArray = toString(mNativeInstance);
String nativeString = "";
try {
    nativeString = new String(byteArray, "UTF-8");
} catch (UnsupportedEncodingException e) {
    Log.e(TAG, "Couldn't convert the jbyteArray to UTF-8");
    e.printStackTrace();
}