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Added ToArray and ToIEnum methods that work on Type value rather than generic type param.

pull/60/head
David Hall 2019-03-15 16:15:48 -06:00
parent ffb7879e3f
commit d7266f1919
1 changed files with 32 additions and 0 deletions
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32
Core/Extensions/InteropExtensions.cs
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@ -331,6 +331,23 @@ namespace Vanara.Extensions
return ret;
}
/// <summary>Converts an <see cref="IntPtr"/> that points to a C-style array into a CLI array.</summary>
/// <param name="ptr">The <see cref="IntPtr"/> pointing to the native array.</param>
/// <param name="type">Type of native structure used by the C-style array.</param>
/// <param name="count">The number of items in the native array.</param>
/// <param name="prefixBytes">Bytes to skip before reading the array.</param>
/// <returns>An array of type <paramref name="type"/> containing the elements of the native array.</returns>
public static object[] ToArray(this IntPtr ptr, Type type, int count, int prefixBytes = 0)
{
if (type is null) throw new ArgumentNullException(nameof(type));
if (ptr == IntPtr.Zero) return null;
var ret = new object[count];
var stSize = Marshal.SizeOf(type);
for (var i = 0; i < count; i++)
ret[i] = Marshal.PtrToStructure(ptr.Offset(prefixBytes + i * stSize), type);
return ret;
}
/// <summary>Converts an <see cref="IntPtr"/> that points to a C-style array into an <see cref="IEnumerable{T}"/>.</summary>
/// <typeparam name="T">Type of native structure used by the C-style array.</typeparam>
/// <param name="ptr">The <see cref="IntPtr"/> pointing to the native array.</param>
@ -345,6 +362,21 @@ namespace Vanara.Extensions
yield return ToStructure<T>(ptr.Offset(prefixBytes + i * stSize));
}
/// <summary>Converts an <see cref="IntPtr"/> that points to a C-style array into an <see cref="IEnumerable{T}"/>.</summary>
/// <param name="ptr">The <see cref="IntPtr"/> pointing to the native array.</param>
/// <param name="type">Type of native structure used by the C-style array.</param>
/// <param name="count">The number of items in the native array.</param>
/// <param name="prefixBytes">Bytes to skip before reading the array.</param>
/// <returns>An <see cref="IEnumerable{T}"/> exposing the elements of the native array.</returns>
public static IEnumerable<object> ToIEnum(this IntPtr ptr, Type type, int count, int prefixBytes = 0)
{
if (type is null) throw new ArgumentNullException(nameof(type));
if (count == 0 || ptr == IntPtr.Zero) yield break;
var stSize = Marshal.SizeOf(type);
for (var i = 0; i < count; i++)
yield return Marshal.PtrToStructure(ptr.Offset(prefixBytes + i * stSize), type);
}
/// <summary>Converts a <see cref="SecureString"/> to a string.</summary>
/// <param name="s">The <see cref="SecureString"/> value.</param>
/// <returns>The extracted string.</returns>