不使用QAndroidJniObject调用的三个函数之一

Question

Here is the code that calls three functions from my custom java class:

QAndroidJniObject datafile = QAndroidJniObject::fromString(path);
QAndroidJniObject password = QAndroidJniObject::fromString("asimpletest");

QAndroidJniObject::callStaticObjectMethod("org/qcolocrypt/AESCrypt",
                                          "AESCryptInit",
                                          "(Ljava/lang/String;Ljava/lang/String;)V;",
                                          password.object<jstring>(),
                                          datafile.object<jstring>());


QAndroidJniObject decrypted_data = QAndroidJniObject::callStaticObjectMethod("org/qcolocrypt/AESCrypt",
                                                                             "decrypt",
                                                                             "()Ljava/lang/String;");


QAndroidJniObject fname = QAndroidJniObject::callStaticObjectMethod("org/qcolocrypt/AESCrypt",
                                                                   "getFilename",
                                                                   "()Ljava/lang/String;");

QAndroidJniObject status = QAndroidJniObject::callStaticObjectMethod("org/qcolocrypt/AESCrypt",
                                                                   "getStatus",
                                                                   "()Ljava/lang/String;");

Here is the java code for three of these functions:

The non working one:

public static void AESCryptInit (String passwd, String datafile){

    // Initializing variables.
    rawdata = null;
    status = "";
    fileName = datafile;

    Log.i("[QCOLOCRYPT]","The filename is " + datafile);

    // Transforming the passwd to 16 bytes.
    try {
        MessageDigest digester = MessageDigest.getInstance("MD5");
        InputStream in = new ByteArrayInputStream(Charset.forName(encoding).encode(passwd).array());
        byte[] buffer = new byte[NCHARS];
        int byteCount;
        while ((byteCount = in.read(buffer)) > 0) {
            digester.update(buffer, 0, byteCount);
        }
        keyBytes = digester.digest();
    }
    catch(Exception e){
        status = "Error in key generation: " + e.toString();
    }

    // Initilizing the crypto engine
    try {
        cipher = Cipher.getInstance(algorithm);
    }
    catch(Exception e){
        status = "Error in intialization: " + e.toString();
    }
    secretKeySpec = new SecretKeySpec(keyBytes, "AES");
    ivParameterSpec = new IvParameterSpec(keyBytes);

}

And two that work

// Getting status
public static String getStatus(){return status;}

public static String getFilename() {
   Log.i("[QCOLOCRYPT]","Getting the file name");
   return "The Filename is: " + fileName;
}

The non-working function is not being called because its debug message is NOT being printed, while I get the log message AND the return values of the other two. Logcat does not seem to show any errors, so I'm at a loss. Am I calling it wrong?

Answer 1

Ok, so this isn't exactly an answer. It's more of a workaround, I got the function to work, but the only way I could do it is by returning a String. I've tried with an Integer using (Arguments)I; as the signature but I had the same problem. I modified the Java function to return a status string, changed the signature to reflect that, and everything worked perfectly. Though its weird.