C# Definition:

[StructLayout(LayoutKind.Explicit)]
public struct PROPSPEC
{
     [FieldOffset(0)] public int ulKind;     // 0 - string used; 1 - PROPID
     [FieldOffset(4)] public int propid;    
     [FieldOffset(4)] public IntPtr lpwstr;
}

VB Definition:

#Region "PROPSPEC Structure Definition"

  '/// <summary>
  '/// The PROPSPEC structure is used by many of the methods of IPropertyStorage to specify a property either by its property identifier (ID) or the associated string name.
  '/// </summary>
  <StructLayout(LayoutKind.Sequential)> _
  Public Structure PROPSPEC
    '/// <summary>
    '/// Indicates whether the propid or lpwstr member used.
    '/// </summary>
    Public ulKind As PROPSPECKIND

    '/// <summary>
    '/// Specifies the value of the property ID. Use either this value or the following lpwstr, not both.
    '/// </summary>
    Public propid As UInt32

    '/// <summary>
    '/// Specifies the string name of the property as a null-terminated Unicode string.
    '/// </summary>
    Public lpwstr As IntPtr
  End Structure

#End Region

User-Defined Field Types:

PROPSPECKIND

Notes:

None.

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