Hello,

till now I could manage well with mapping from Native C. However I reached a point where the memory is not filled correctly, it's always null for an internal list.

Here the the C code:

typedef struct MyStructList { MyStruct **list; int64_t length; } MyStructList;

where MyStruct is defined as follows:

typedef struct MyStruct { int8_t *name; int64_t index; } MyStruct;

and

DLLAPI void testMyStruct(const MyStructList *structList);

I have mapped MyStruct to JNA as follows: public class MyStruct extends Structure implements Serializable { public static class ByValue extends MyStruct implements Structure.ByValue { }//also used ByReference...

public String name; public long index;

public MyStruct() { }

public MyStruct(String name, long index) { this.name = name; this.index = index; }

}

Somehow I tried several possibilities to map MyStructList, here one guess: public class MyStructList extends Structure implements Serializable {

public static class ByReference extends MyStructList implements Structure.ByReference { }

public Pointer list; public long length; ... public MyStructList(MyStruct[] myStruct) { this.length += 1; MyStruct tmp = new MyStruct(); MyStruct[] t = (MyStruct[]) tmp.toArray((int)this.length); for(int i=0; i<this.length; i++) { MyStruct tb = tmp; tb.name = myStruct[i].name; tb.index = myStruct[i].index; t[i] = tb; } this.list = tmp.getPointer(); allocateMemory(); } }

I tested with one element. In the Java debugger everything seems to be correct, however on the C side, the first entry in the list is NULL.

So how do I have to map and to handle this correctly?

Thanks in advance, Dirk