Hello subhi, according to your question i think u r not able to pass the JNIENv & Jstring parameter to ur function, so i will suggest just include jni.h header in your file, so that you can pass the argument and one more thing if you are using this dll for java programme then first creat header file for that. After creating header file, you will get function signature in that file, just use that signature in your c++ file. And you can have parameter like JString, jobject and many more.

Please clarify what do you want to do?