CODEWITHSUNDEEP
c++java-native-interface
WoooHaaaa
WoooHaaaa

Reputation: 20460

JNI : When should I release resources?

JNIEXPORT jstring JNICALL Java_com_xxx_xpdf_PdfToText_getTextOnly(JNIEnv *env, jclass obj,
                                                                 jstring pdf_path) {
  const char *pdf = env->GetStringUTFChars(pdf_path, 0);

  std::string content;
  unsigned int i = getTextFromPDF(pdf, &content);

  env->ReleaseStringUTFChars(pdf_path, pdf);

  const char *result = content.c_str();
  jstring str = env->NewStringUTF(result);

  return str;
}

Do I need to relase str and content here ? And why ?

Upvotes: 1

Views: 539

Answers (1)

user207421
user207421

Reputation: 310980

No. str refers to a Java object which continues to exist beyond this JNI method, as it is the return value. content is a C++ local object which is auto-destroyed when its declaring scope exits.

Upvotes: 2

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