JNAerator Unnamed Union Missing in Structure

Question

I'm trying to get JNAerator to generate some JNA backed Java code from a C shared library and everything is fine except that it failed to generate an unnamed union nested inside a structure.

Example:

typedef struct MY_STRUCTURE {
  union {
    My_Type1 var1;
    My_Type2 var2;
  };

}MY_STRUCTURE;

If I change the header to make the union have a name it will work. But for obvious reasons I can't just change the header without breaking the shared library I'm trying to use.

Any solutions other than changing the header file and shared library to named union?

Answer 1

Adding a name won't change the memory layout, so you can change the name, JNAerate the Java code (which will map the memory/structure appropriately) and then undo your change. JNA's mapping of the structure to your actual library won't be impacted by adding a name.

edit: your results are a little strange, since the JNAerator documentation clearly addresses the anonymous types problem and seems to indicate that it should produce the correct results.