java - 错误：JNINativeMethod nfptr 抛出从 jobjectarray* 到 void* 的无效转换

Question

我有以下简单的 jni 应用程序：

jobjectArray ListItems(JNIEnv *env, jobject self, jstring library)
{
   jclass c = env->FindClass("java/lang/String");
   jobjectArray a = env->NewObjectArray(2, c, 0);
   env->SetObjectArrayElement(a, 0, env->NewStringUTF("text1"));
   env->SetObjectArrayElement(a, 1, env->NewStringUTF("text2"));
   return a;
}

int main()
{
      ...
      ...*load and initialize Java VM and JNI interface*
      ...
      JNINativeMethod m[1];
      m[0].fnPtr = ListItems;
      m[0].name = "listItems";
      m[0].signature = "(Ljava/lang/String;)[Ljava/lang/String;";
      env->RegisterNatives(myJavaClass, m, 1);
}

当我按如下方式编译代码时，它给了我“错误：从 jobjectarray* 到 void* 的无效转换”

 g++ -I"JNI\include" -I"JNI\include\win32" test.cpp -o test.exe

标签： javac++java-native-interface

Answer 1

正如@Michael 所说，只需要一个 void* 铸造：

   int main()
  {
      ...
      ...*load and initialize Java VM and JNI interface*
      ...
      JNINativeMethod m[1];
      m[0].fnPtr =(void*) ListItems;
      m[0].name = "listItems";
      m[0].signature = "(Ljava/lang/String;)[Ljava/lang/String;";
      env->RegisterNatives(myJavaClass, m, 1
  }