mirror of https://github.com/dahall/Vanara.git
Added ResourceIdOrHandle<THandle> to represent a resource string, id or handle union
David Hall
parent
da9aa6586a
commit
a060052f3b
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@ -151,6 +151,9 @@ namespace Vanara.PInvoke
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case ResourceId r:
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return Equals(r);
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case IHandle h:
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return Equals(h.DangerousGetHandle());
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default:
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if (!obj.GetType().IsPrimitive) return false;
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try { return Equals(Convert.ToInt32(obj)); } catch { return false; }
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@ -191,6 +194,123 @@ namespace Vanara.PInvoke
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public IntPtr DangerousGetHandle() => ptr;
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}
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/// <summary>Helper structure to use for a pointer that can morph into a string, handle or integer.</summary>
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[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Auto)]
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[PInvokeData("winuser.h")]
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public struct ResourceIdOrHandle<THandle> : IEquatable<string>, IEquatable<int>, IEquatable<ResourceIdOrHandle<THandle>>, IHandle where THandle : IHandle
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{
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private IntPtr ptr;
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/// <summary>Gets or sets an integer identifier.</summary>
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/// <value>The identifier.</value>
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public int id
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{
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get => IS_INTRESOURCE(ptr) ? (ushort)ptr.ToInt32() : 0;
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set
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{
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if (value > ushort.MaxValue || value <= 0) throw new ArgumentOutOfRangeException(nameof(id));
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ptr = (IntPtr)(ushort)value;
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}
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}
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/// <summary>Represent a NULL value.</summary>
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public static readonly ResourceIdOrHandle<THandle> NULL = new ResourceIdOrHandle<THandle>();
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/// <summary>Performs an implicit conversion from <see cref="SafeResourceId"/> to <see cref="System.Int32"/>.</summary>
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/// <param name="r">The r.</param>
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/// <returns>The result of the conversion.</returns>
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public static implicit operator int(ResourceIdOrHandle<THandle> r) => r.id;
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/// <summary>Performs an implicit conversion from <see cref="ResourceIdOrHandle{THandle}"/> to <see cref="IntPtr"/>.</summary>
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/// <param name="r">The r.</param>
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/// <returns>The result of the conversion.</returns>
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public static implicit operator IntPtr(ResourceIdOrHandle<THandle> r) => r.ptr;
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/// <summary>Performs an implicit conversion from <see cref="int"/> to <see cref="ResourceIdOrHandle{THandle}"/>.</summary>
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/// <param name="resId">The resource identifier.</param>
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/// <returns>The result of the conversion.</returns>
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public static implicit operator ResourceIdOrHandle<THandle>(int resId) => new ResourceIdOrHandle<THandle> { id = resId };
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/// <summary>Performs an implicit conversion from <see cref="ResourceType"/> to <see cref="ResourceIdOrHandle{THandle}"/>.</summary>
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/// <param name="resType">Type of the resource.</param>
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/// <returns>The result of the conversion.</returns>
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public static implicit operator ResourceIdOrHandle<THandle>(ResourceType resType) => new ResourceIdOrHandle<THandle> { id = (int)resType };
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/// <summary>Performs an implicit conversion from <see cref="IntPtr"/> to <see cref="ResourceIdOrHandle{THandle}"/>.</summary>
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/// <param name="p">The PTR.</param>
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/// <returns>The result of the conversion.</returns>
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public static implicit operator ResourceIdOrHandle<THandle>(THandle p) => new ResourceIdOrHandle<THandle> { ptr = p.DangerousGetHandle() };
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/// <summary>Performs an implicit conversion from <see cref="ResourceIdOrHandle{THandle}"/> to <see cref="string"/>.</summary>
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/// <param name="r">The r.</param>
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/// <returns>The result of the conversion.</returns>
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public static explicit operator string(ResourceIdOrHandle<THandle> r) => r.ToString();
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/// <summary>Determines whether the specified <see cref="System.Object"/>, is equal to this instance.</summary>
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/// <param name="obj">The <see cref="System.Object"/> to compare with this instance.</param>
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/// <returns><c>true</c> if the specified <see cref="System.Object"/> is equal to this instance; otherwise, <c>false</c>.</returns>
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public override bool Equals(object obj)
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{
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switch (obj)
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{
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case null:
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return false;
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case string s:
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return Equals(s);
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case int i:
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return Equals(i);
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case IntPtr p:
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return Equals(p);
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case ResourceIdOrHandle<THandle> r:
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return Equals(r);
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case IHandle h:
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return Equals(h.DangerousGetHandle());
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default:
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if (!obj.GetType().IsPrimitive) return false;
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try { return Equals(Convert.ToInt32(obj)); } catch { return false; }
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}
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}
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/// <summary>Returns a hash code for this instance.</summary>
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/// <returns>A hash code for this instance, suitable for use in hashing algorithms and data structures like a hash table.</returns>
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public override int GetHashCode() => ptr.GetHashCode();
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/// <summary>Returns a <see cref="string"/> that represents this instance.</summary>
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/// <returns>A <see cref="string"/> that represents this instance.</returns>
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public override string ToString() => IS_INTRESOURCE(ptr) ? $"#{ptr.ToInt32()}" : Marshal.PtrToStringAuto(ptr);
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/// <summary>Indicates whether the current object is equal to another object of the same type.</summary>
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/// <param name="other">An object to compare with this object.</param>
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/// <returns>true if the current object is equal to the <paramref name="other"/> parameter; otherwise, false.</returns>
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public bool Equals(int other) => ptr.ToInt32().Equals(other);
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/// <summary>Indicates whether the current object is equal to another object of the same type.</summary>
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/// <param name="other">An object to compare with this object.</param>
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/// <returns>true if the current object is equal to the <paramref name="other"/> parameter; otherwise, false.</returns>
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/// <exception cref="NotImplementedException"></exception>
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public bool Equals(string other) => string.Equals(ToString(), other);
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/// <summary>Indicates whether the current object is equal to another object of the same type.</summary>
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/// <param name="other">An object to compare with this object.</param>
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/// <returns>true if the current object is equal to the <paramref name="other"/> parameter; otherwise, false.</returns>
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public bool Equals(IntPtr other) => ptr.Equals(other);
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/// <summary>Indicates whether the current object is equal to another object of the same type.</summary>
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/// <param name="other">An object to compare with this object.</param>
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/// <returns>true if the current object is equal to the <paramref name="other"/> parameter; otherwise, false.</returns>
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/// <exception cref="NotImplementedException"></exception>
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public bool Equals(ResourceIdOrHandle<THandle> other) => string.Equals(other.ToString(), ToString());
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/// <inheritdoc/>
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public IntPtr DangerousGetHandle() => ptr;
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}
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/// <summary>Represents a system resource name that can identify as a string, integer, or pointer.</summary>
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/// <seealso cref="SafeHandle"/>
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public class SafeResourceId : GenericSafeHandle, IEquatable<string>, IEquatable<int>, IEquatable<SafeResourceId>, IEquatable<ResourceId>, IEquatable<IntPtr>, IHandle
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