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Broke down and finally used an unsafe struct for this.

pull/60/head
David Hall 2019-04-08 19:44:08 -06:00
parent 83404805c7
commit 73792290f6
1 changed files with 5 additions and 25 deletions
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30
PInvoke/Shared/WinNT/OBJECT_TYPE_LIST.cs
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@ -28,7 +28,7 @@ namespace Vanara.PInvoke
// typedef struct _OBJECT_TYPE_LIST { WORD Level; WORD Sbz; GUID *ObjectType; } OBJECT_TYPE_LIST, *POBJECT_TYPE_LIST; // typedef struct _OBJECT_TYPE_LIST { WORD Level; WORD Sbz; GUID *ObjectType; } OBJECT_TYPE_LIST, *POBJECT_TYPE_LIST;
[PInvokeData("winnt.h", MSDNShortId = "c729ff1a-65f3-4f6f-84dd-5700aead75ce")] [PInvokeData("winnt.h", MSDNShortId = "c729ff1a-65f3-4f6f-84dd-5700aead75ce")]
[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Unicode, Pack = 2)] [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Unicode, Pack = 2)]
public partial class OBJECT_TYPE_LIST : IDisposable public unsafe struct OBJECT_TYPE_LIST
{ {
/// <summary> /// <summary>
/// Specifies the level of the object type in the hierarchy of an object and its subobjects. Level zero indicates the object itself. /// Specifies the level of the object type in the hierarchy of an object and its subobjects. Level zero indicates the object itself.
@ -41,39 +41,19 @@ namespace Vanara.PInvoke
public ushort Sbz; public ushort Sbz;
/// <summary>A pointer to the GUID for the object or subobject.</summary> /// <summary>A pointer to the GUID for the object or subobject.</summary>
public IntPtr guidObjectType; public Guid* guidObjectType;
/// <summary>Initializes a new instance of the <see cref="OBJECT_TYPE_LIST"/> struct.</summary> /// <summary>Initializes a new instance of the <see cref="OBJECT_TYPE_LIST"/> struct.</summary>
/// <param name="level">The level of the object type in the hierarchy of an object and its subobjects.</param> /// <param name="level">The level of the object type in the hierarchy of an object and its subobjects.</param>
/// <param name="objType">The object or subobject identifier.</param> /// <param name="objType">The object or subobject identifier.</param>
public OBJECT_TYPE_LIST(ObjectTypeListLevel level, Guid objType) public OBJECT_TYPE_LIST(ObjectTypeListLevel level, Guid objType = default)
{ {
Sbz = 0; Sbz = 0;
this.level = level; this.level = level;
ObjectId = objType; guidObjectType = objType == default ? null : &objType;
} }
/// <summary>Represents an object that is itself.</summary> /// <summary>Represents an object that is itself.</summary>
public static readonly OBJECT_TYPE_LIST Self = new OBJECT_TYPE_LIST(0, Guid.Empty); public static readonly OBJECT_TYPE_LIST Self = new OBJECT_TYPE_LIST();
/// <summary>The GUID for the object or subobject</summary>
public Guid ObjectId
{
get => guidObjectType == IntPtr.Zero ? Guid.Empty : (Guid)Marshal.PtrToStructure(guidObjectType, typeof(Guid));
set
{
((IDisposable)this).Dispose();
guidObjectType = Marshal.AllocCoTaskMem(Marshal.SizeOf(typeof(Guid)));
Marshal.StructureToPtr(value, guidObjectType, true);
}
}
/// <summary>Performs application-defined tasks associated with freeing, releasing, or resetting unmanaged resources.</summary>
void IDisposable.Dispose()
{
if (guidObjectType != IntPtr.Zero)
Marshal.FreeCoTaskMem(guidObjectType);
guidObjectType = IntPtr.Zero;
}
} }
} }