title: Syntax for converting jstring and appending
body: <pre><code>JNIEXPORT int JNICALL Java_com_ndkfoo_test_GL2JNILib_step2(JNIEnv * env, jobject obj,  jstring filePath)
  {
      const jbyte *str;
      str = (*env)-&gt;GetStringUTFChars(env, filePath, NULL);
      char* fullPath=str.append("FileName.txt"); // error
      char* fullPath2=str+"fileName.txt"          // error
  }
  </code></pre>
  
  <p>Could someone please indicate the right syntax to create define fullPathName? I think passing jstring in is correct but I don't know how to convert to pull path name for <code>fopen()</code>.</p>