kopia lustrzana https://github.com/dl2alf/AirScout
139 wiersze
6.5 KiB
C#
139 wiersze
6.5 KiB
C#
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using System.Collections.Generic;
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namespace System.Runtime.InteropServices
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{
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internal static class InteropUtil
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{
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internal const int cbBuffer = 256;
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[Security.Permissions.SecurityPermission(Security.Permissions.SecurityAction.LinkDemand, Flags = Security.Permissions.SecurityPermissionFlag.UnmanagedCode)]
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public static T ToStructure<T>(this IntPtr ptr) => (T)Marshal.PtrToStructure(ptr, typeof(T));
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public static IntPtr StructureToPtr<T>(this T value) where T : struct
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{
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var ret = Marshal.AllocHGlobal(Marshal.SizeOf(value));
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Marshal.StructureToPtr(value, ret, false);
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return ret;
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}
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[Security.Permissions.SecurityPermission(Security.Permissions.SecurityAction.LinkDemand, Flags = Security.Permissions.SecurityPermissionFlag.UnmanagedCode)]
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public static void AllocString(ref IntPtr ptr, ref uint size)
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{
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FreeString(ref ptr, ref size);
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if (size == 0) size = cbBuffer;
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ptr = Marshal.AllocHGlobal(cbBuffer);
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}
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[Security.Permissions.SecurityPermission(Security.Permissions.SecurityAction.LinkDemand, Flags = Security.Permissions.SecurityPermissionFlag.UnmanagedCode)]
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public static void FreeString(ref IntPtr ptr, ref uint size)
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{
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if (ptr == IntPtr.Zero) return;
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Marshal.FreeHGlobal(ptr);
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ptr = IntPtr.Zero;
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size = 0;
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}
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[Security.Permissions.SecurityPermission(Security.Permissions.SecurityAction.LinkDemand, Flags = Security.Permissions.SecurityPermissionFlag.UnmanagedCode)]
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public static string GetString(IntPtr pString) => Marshal.PtrToStringUni(pString);
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[Security.Permissions.SecurityPermission(Security.Permissions.SecurityAction.LinkDemand, Flags = Security.Permissions.SecurityPermissionFlag.UnmanagedCode)]
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public static bool SetString(ref IntPtr ptr, ref uint size, string value = null)
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{
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var s = GetString(ptr);
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if (value == string.Empty) value = null;
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if (string.CompareOrdinal(s, value) == 0) return false;
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FreeString(ref ptr, ref size);
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if (value == null) return true;
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ptr = Marshal.StringToHGlobalUni(value);
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size = (uint)value.Length + 1;
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return true;
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}
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/// <summary>
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/// Converts an <see cref="IntPtr"/> that points to a C-style array into a CLI array.
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/// </summary>
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/// <typeparam name="TS">Type of native structure used by the C-style array.</typeparam>
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/// <typeparam name="T">Output type for the CLI array. <typeparamref name="TS"/> must be able to convert to <typeparamref name="T"/>.</typeparam>
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/// <param name="ptr">The <see cref="IntPtr"/> pointing to the native array.</param>
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/// <param name="count">The number of items in the native array.</param>
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/// <param name="prefixBytes">Bytes to skip before reading the array.</param>
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/// <returns>An array of type <typeparamref name="T"/> containing the converted elements of the native array.</returns>
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public static T[] ToArray<TS, T>(this IntPtr ptr, int count, int prefixBytes = 0) where TS : IConvertible
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{
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var ret = new T[count];
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var stSize = Marshal.SizeOf(typeof(TS));
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for (var i = 0; i < count; i++)
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{
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var val = ToStructure<TS>(Marshal.ReadIntPtr(ptr, prefixBytes + i * stSize));
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ret[i] = (T)Convert.ChangeType(val, typeof(T));
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}
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return ret;
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}
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/// <summary>
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/// Converts an <see cref="IntPtr"/> that points to a C-style array into a CLI array.
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/// </summary>
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/// <typeparam name="T">Type of native structure used by the C-style array.</typeparam>
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/// <param name="ptr">The <see cref="IntPtr"/> pointing to the native array.</param>
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/// <param name="count">The number of items in the native array.</param>
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/// <param name="prefixBytes">Bytes to skip before reading the array.</param>
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/// <returns>An array of type <typeparamref name="T"/> containing the elements of the native array.</returns>
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public static T[] ToArray<T>(this IntPtr ptr, int count, int prefixBytes = 0)
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{
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var ret = new T[count];
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var stSize = Marshal.SizeOf(typeof(T));
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for (var i = 0; i < count; i++)
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ret[i] = ToStructure<T>(Marshal.ReadIntPtr(ptr, prefixBytes + i * stSize));
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return ret;
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}
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/// <summary>
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/// Converts an <see cref="IntPtr"/> that points to a C-style array into an <see cref="IEnumerable{T}"/>.
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/// </summary>
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/// <typeparam name="T">Type of native structure used by the C-style array.</typeparam>
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/// <param name="ptr">The <see cref="IntPtr"/> pointing to the native array.</param>
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/// <param name="count">The number of items in the native array.</param>
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/// <param name="prefixBytes">Bytes to skip before reading the array.</param>
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/// <returns>An <see cref="IEnumerable{T}"/> exposing the elements of the native array.</returns>
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public static IEnumerable<T> ToIEnum<T>(this IntPtr ptr, int count, int prefixBytes = 0)
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{
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if (count == 0) yield break;
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var stSize = Marshal.SizeOf(typeof(T));
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for (var i = 0; i < count; i++)
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yield return ToStructure<T>(Marshal.ReadIntPtr(ptr, prefixBytes + i * stSize));
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}
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/// <summary>
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/// Converts an <see cref="IntPtr" /> to a structure. If pointer has no value, <c>null</c> is returned.
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/// </summary>
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/// <typeparam name="T">Type of the structure.</typeparam>
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/// <param name="ptr">The <see cref="IntPtr" /> that points to allocated memory holding a structure or <see cref="IntPtr.Zero"/>.</param>
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/// <returns>The converted structure or <c>null</c>.</returns>
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public static T? PtrToStructure<T>(this IntPtr ptr) where T : struct => ptr != IntPtr.Zero ? ptr.ToStructure<T>() : (T?)null;
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/// <summary>
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/// Converts a structure or null value to an <see cref="IntPtr" />. If memory has not been allocated for the <paramref name="ptr"/>, it will be via a call to <see cref="Marshal.AllocHGlobal(int)"/>.
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/// </summary>
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/// <typeparam name="T">Type of the structure.</typeparam>
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/// <param name="value">The structure to convert. If this value is <c>null</c>, <paramref name="ptr"/> will be set to <see cref="IntPtr.Zero"/> and memory will be released.</param>
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/// <param name="ptr">The <see cref="IntPtr" /> that will point to allocated memory holding the structure or <see cref="IntPtr.Zero"/>.</param>
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/// <param name="isEmpty">An optional predicate check to determine if the structure is non-essential and can be replaced with an empty pointer (<c>null</c>).</param>
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public static void StructureToPtr<T>(T? value, ref IntPtr ptr, Predicate<T> isEmpty = null) where T : struct
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{
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if (value == null || (isEmpty != null && isEmpty(value.Value)))
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{
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if (ptr == IntPtr.Zero) return;
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Marshal.FreeHGlobal(ptr);
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ptr = IntPtr.Zero;
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}
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else
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{
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if (ptr == IntPtr.Zero)
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ptr = Marshal.AllocHGlobal(Marshal.SizeOf(typeof(T)));
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Marshal.StructureToPtr(value, ptr, false);
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}
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}
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}
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}
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