Hi Steven,

Actually it’s not possible to create a DoubleFloat object form array of double values directly. One of possible ways to convert double[] array to the appropriate pointer is to use PrimitiveArray of DoubleFloat objects, for example:

double array[] = {1.0, 2.0, 3.0};
PrimitiveArray arrayParameter = new PrimitiveArray(DoubleFloat.class, array.length);
for (int i = 0; i < array.length; i++) {
    arrayParameter.setElement(i, new DoubleFloat(array[i]));
}
 
Pointer arrayPtr = new Pointer(arrayParameter);

It’s also possible to set this array pointer to a Variant value, for example:

Variant variant = new Variant();
arrayPtr.castTo(variant.getPdblVal());
variant.getVt().setValue(VarType.VT_R8 | VarType.VT_BYREF);

The concern in this case is that Variant type does not seem to be designed for passing of arrays in such way. Our guess is that such approach could probably work only in one case – when you pass this pointer to an inproc component which shares the same address space. But if this Variant goes out of scope of a process then COM marshaler will leave only a first element of array.

               
-Serge