PInvoke returns C type with union

Question

How would I P/Invoke a C function which returns a union'ed struct?

Answer 1

You would need to use a StructLayout of explicit and the FieldOffset attribute.

An example of usage:

<StructLayout(LayoutKind.Explicit, Size:=4)> _
   Public Structure DWord
      <FieldOffset(0)> Public Value As Int32
      <FieldOffset(0)> Public High As Int16
      <FieldOffset(2)> Public Low As Int16
   End Structure