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Added LinkedListToIEnum method for pointer interop

pull/10/head
David Hall 2018-01-06 16:34:28 -07:00
parent 9b7e3ef765
commit 7e372c55db
1 changed files with 16 additions and 0 deletions
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16
Core/Extensions/InteropExtensions.cs
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@ -40,6 +40,22 @@ namespace Vanara.Extensions
/// <returns><c>true</c> if the specified type is nullable; otherwise, <c>false</c>.</returns>
public static bool IsNullable(this Type type) => type.IsGenericType && type.GetGenericTypeDefinition() == typeof(Nullable<>);
/// <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="next">The expression to be used to fetch the pointer to the next item in the list.</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, IntPtr> next)
{
for (var pCurrent = ptr; pCurrent != IntPtr.Zero; )
{
var ret = pCurrent.ToStructure<T>();
yield return ret;
pCurrent = next(ret);
}
yield break;
}
/// <summary>Marshals data from a managed list of specified type to a pre-allocated unmanaged block of memory.</summary>
/// <typeparam name="T">
/// A type of the enumerated managed object that holds the data to be marshaled. The object must be a structure or an instance of a formatted class.