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Overloaded IntPtr.LinkedListToEnum extension method to allow for offset func.

pull/180/head
dahall 2020-11-04 13:04:42 -07:00
parent ba890fd03d
commit db7884b6f5
1 changed files with 19 additions and 0 deletions
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19
Core/Extensions/InteropExtensions.cs
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@ -214,6 +214,25 @@ namespace Vanara.Extensions
}
}
/// <summary>Marshals an unmanaged linked list of structures to an <see cref="IEnumerable{T}"/> of that structure.</summary>
/// <typeparam name="T">Type of native structure used by the unmanaged linked list.</typeparam>
/// <param name="ptr">The <see cref="IntPtr"/> pointing to the native array.</param>
/// <param name="nextOffset">The expression to be used to fetch the offset from the current pointer to the next item in the list.</param>
/// <param name="allocatedBytes">
/// The number of allocated bytes behind <paramref name="ptr"/>. This value is used to determine when to stop enumerating.
/// </param>
/// <returns>An <see cref="IEnumerable{T}"/> exposing the elements of the linked list.</returns>
public static IEnumerable<T> LinkedListToIEnum<T>(this IntPtr ptr, Func<T, long> nextOffset, SizeT allocatedBytes)
{
var pEnd = ptr.Offset(allocatedBytes);
for (var pCurrent = ptr; pCurrent.ToInt64() < pEnd.ToInt64();)
{
var ret = pCurrent.ToStructure<T>();
yield return ret;
pCurrent = pCurrent.Offset(nextOffset(ret));
}
}
/// <summary>
/// Marshals data from a managed list of objects to an unmanaged block of memory allocated by the <paramref name="memAlloc"/> method.
/// </summary>