CODEWITHSUNDEEP
java-native-interface
Alireza Haji gholamreza
Alireza Haji gholamreza

Reputation: 157

Call method String java from ndk with languge c++

i want to call method inside java and retrun a string to ndk but my app will crash when i calling java method . i checked more stackoverflow site but when im using other codes,it dont work. help me thanks

inside ndk code :

extern "C"
 JNIEXPORT jstring JNICALL
 Java_com_hppni_battleword_view_SplashScreen_tkk(JNIEnv *env, jclass type) {
 jclass jClass = env->FindClass("com/hppni/battleword/view/SplashScreen");
 if (jClass != nullptr) {
    jmethodID mid2 = env->GetStaticMethodID(jClass, "encryptThisString",
                                            "(Ljava/lang/String;)Ljava/lang/String;"); // app will crash here
    if (mid2 != nullptr) {
        env->CallStaticVoidMethod(jClass, mid2, (jstring) "ali"); // app will crash here
    }
}
 return env->NewStringUTF(getSignature(env));
}

inside java class/Activity :

 public static String encryptThisString(String input) {
    Log.d("NDK", input);
  return input;
 }

Upvotes: 0

Views: 175

Answers (1)

sklott
sklott

Reputation: 2849

You can't just cast char * string to jstring. You need to create jstring object using JNI functions like NewStringUTF, for example.

Upvotes: 1

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