mirror of https://github.com/dahall/Vanara.git
53 lines
2.5 KiB
C#
53 lines
2.5 KiB
C#
namespace Vanara.InteropServices;
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/// <summary>Functions to safely convert a memory pointer to a type.</summary>
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public static class IntPtrConverter
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{
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/// <summary>Converts the specified pointer to <typeparamref name="T"/>.</summary>
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/// <typeparam name="T">The destination type.</typeparam>
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/// <param name="ptr">The pointer to a block of memory.</param>
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/// <param name="sz">The size of the allocated memory block.</param>
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/// <param name="charSet">The character set.</param>
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/// <returns>A value of the type specified.</returns>
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public static T? Convert<T>(this IntPtr ptr, uint sz, CharSet charSet = CharSet.Auto) => (T?)Convert(ptr, sz, typeof(T), charSet);
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/// <summary>Converts the specified pointer to <typeparamref name="T"/>.</summary>
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/// <typeparam name="T">The destination type.</typeparam>
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/// <param name="hMem">A block of allocated memory.</param>
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/// <param name="charSet">The character set.</param>
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/// <returns>A value of the type specified.</returns>
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public static T? ToType<T>(this SafeAllocatedMemoryHandle hMem, CharSet charSet = CharSet.Auto)
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{
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if (hMem is null) throw new ArgumentNullException(nameof(hMem));
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hMem.Lock();
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try { return Convert<T>(hMem.DangerousGetHandle(), hMem.Size, charSet); }
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finally { hMem.Unlock(); }
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}
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/// <summary>Converts the specified pointer to type specified in <paramref name="destType"/>.</summary>
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/// <param name="ptr">The pointer to a block of memory.</param>
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/// <param name="sz">The size of the allocated memory block.</param>
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/// <param name="destType">The destination type.</param>
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/// <param name="charSet">The character set.</param>
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/// <returns>A value of the type specified.</returns>
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/// <exception cref="ArgumentException">Cannot convert a null pointer. - ptr or Cannot convert a pointer with no Size. - sz</exception>
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/// <exception cref="NotSupportedException">Thrown if type cannot be converted from memory.</exception>
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/// <exception cref="OutOfMemoryException"></exception>
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public static object? Convert(this IntPtr ptr, uint sz, Type destType, CharSet charSet = CharSet.Auto)
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{
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if (ptr == IntPtr.Zero)
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{
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if (!destType.IsValueType) return null;
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throw new NullReferenceException();
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}
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if (sz == 0) throw new ArgumentException("Cannot convert a pointer with no Size.", nameof(sz));
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// Handle byte array and string as special cases
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if (destType.IsArray && destType.GetElementType() == typeof(byte))
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return ptr.ToByteArray((int)sz);
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if (destType == typeof(string))
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return StringHelper.GetString(ptr, charSet, sz);
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return ptr.ToStructure(destType, sz, 0, out _);
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}
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}
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