Hi,

I have trouble to correctly construct and pass a struct that contains a pointer
to a struct array. Here is the problem case. I have tried two solutions which I
could think of, none of which works.

Thank you

Sebastien

* C types

typedef struct VI_TagEntry_t{

TCHAR* name;

VI_Variant value; // another struct

} VI_TagEntry;

// tag list storage

typedef struct VI_TagList_t{

unsigned long size;

VI_TagEntry* list;

} VI_TagList;

* JNA types

public static class VI_TagEntry extends Structure {

public Pointer name;

public VI_Variant value; // another Structure

}

public static class VI_TagList extends Structure {

public long size;

public Pointer list; // VI_TagEntry* list;

}

* JNA test code

private Dll.VI_TagList createSampleVI_TagList() {

Dll.VI_TagList tagList = new Dll.VI_TagList();

Structure[] tagEntryArray = (new Dll.VI_TagEntry()).toArray(2);

tagEntryArray[0] = createSampleVI_TagEntry();

Dll.VI_TagEntry intermediate = createSampleVI_TagEntry();

intermediate.value.data.longVal = 13;

tagList.list = tagEntryArray[0].getPointer();

tagEntryArray[1] = intermediate;

tagList.size = 2;

tagList.write();

return tagList;

}

public void testVI_TagList() {

lib.testVI_TagList(createSampleVI_TagList());

}

* C test code

_declspec(dllexport) void __cdecl testVI_TagEntry(VI_TagEntry* tagEntry) {

printf("tagEntry.name=%S \n", tagEntry->name);

printf("tagEntry.value.d.longVal=%i \n", tagEntry->value.d.longVal);

}

_declspec(dllexport) void __cdecl testVI_TagList(VI_TagList* tagList) {

printf("tagList->size=%i \n", tagList->size);

testVI_TagEntry(tagList->list);

}

* output

tagList->size=2

#

# An unexpected error has been detected by HotSpot Virtual Machine:

#

# EXCEPTION_ACCESS_VIOLATION (0xc0000005) at pc=0x0af51f43, pid=3500, tid=4004

#

# Java VM: Java HotSpot(TM) Client VM (1.5.0_11-b03 mixed mode)

etc

* same output when using in Java test code

Dll.VI_TagEntry[] tagEntryArrayBase = new Dll.VI_TagEntry[2];

Structure[] tagEntryArray = (new
Dll.VI_TagEntry()).toArray(tagEntryArrayBase);

* same output when using as Java test code

private Dll.VI_TagList createSampleVI_TagList() {

Dll.VI_TagList tagList = new Dll.VI_TagList();

tagList.list = new Memory((new Dll.VI_TagEntry()).size()*2);

Dll.VI_TagEntry tagEntry0 = createSampleVI_TagEntry();

byte[] bbuf = tagEntry0.getPointer().getByteArray(0, (new
Dll.VI_TagEntry()).size());

tagList.list.write(0, bbuf, 0, bbuf.length);

tagList.size = 2;

tagList.write();

return tagList;

}