C# Definition:

[StructLayout(LayoutKind.Sequential, Pack = 4)]
public struct LUID_AND_ATTRIBUTES {
   public LUID Luid;
   public UInt32 Attributes;
[StructLayout(LayoutKind.Sequential)]
public struct LUID {
   public UInt32 LowPart;
   public Int32 HighPart;
}

VB Definition:

Structure LUID_AND_ATTRIBUTES
   Public Luid As LUID
   Public Attributes As Integer
Structure LUID
   Public LowPart As Integer
   Public HighPart As Integer
End Structure

User-Defined Field Types:

LUID

Notes:

None.

Why is this defined as two ints instead of a long? As far as I can see there's no need to treat it as anything other than an opaque 64 bit field.

Answer:

This more closely matches the SDK definition of the structure. The LowPart is a DWORD (unsigned), and the HighPart is a LONG (signed).

Additionally you will fall into trouble with memory alignment when you define UInt64 instead of LUID structure.

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