mirror of https://github.com/dahall/Vanara.git
92 lines
4.1 KiB
C#
92 lines
4.1 KiB
C#
#nullable enable
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using System;
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using System.ComponentModel;
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using System.ComponentModel.Design.Serialization;
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using System.Diagnostics;
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using System.Globalization;
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using System.Runtime.InteropServices;
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using System.Text;
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using Vanara.PInvoke;
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namespace Vanara.Windows.Shell
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{
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/// <summary>Wraps a string resource reference used by some Shell classes.</summary>
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[TypeConverter(typeof(IndirectStringTypeConverter))]
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[DebuggerDisplay("{RawValue} => {Value}")]
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public class IndirectString : IndirectResource
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{
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/// <summary>Initializes a new instance of the <see cref="IndirectString"/> class.</summary>
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public IndirectString() { }
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/// <summary>Initializes a new instance of the <see cref="IndirectString"/> class.</summary>
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public IndirectString(string? value) : base(value) { }
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/// <summary>Initializes a new instance of the <see cref="IndirectString"/> class.</summary>
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/// <param name="module">The module file name.</param>
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/// <param name="resourceIdOrIndex">
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/// If this number is positive, this is the index of the resource in the module file. If negative, the absolute value of the number
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/// is the resource ID of the string in the module file.
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/// </param>
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public IndirectString(string module, int resourceIdOrIndex) : base(module, resourceIdOrIndex) { }
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/// <summary>Gets the localized string referred to by this instance.</summary>
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/// <value>The referenced localized string.</value>
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[Browsable(false)]
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public string? Value
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{
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get
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{
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if (RawValue is null) return null;
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if (!IsValid) return RawValue;
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var sb = new StringBuilder(4096);
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SHLoadIndirectString(RawValue, sb, (uint)sb.Capacity).ThrowIfFailed();
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return sb.ToString();
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}
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}
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/// <summary>Performs an implicit conversion from <see cref="IndirectString"/> to <see cref="string"/>.</summary>
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/// <param name="ind">The ind.</param>
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/// <returns>The result of the conversion.</returns>
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public static implicit operator string?(IndirectString? ind) => ind?.RawValue;
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/// <summary>Performs an implicit conversion from <see cref="string"/> to <see cref="IndirectString"/>.</summary>
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/// <param name="s">The s.</param>
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/// <returns>The result of the conversion.</returns>
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public static implicit operator IndirectString(string? s) => new(s);
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/// <summary>Tries to parse the specified string to create a <see cref="IndirectString"/> instance.</summary>
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/// <param name="value">The string representation in the format of either "ModuleFileName,ResourceIndex" or "ModuleFileName,-ResourceID".</param>
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/// <param name="loc">The resulting <see cref="IndirectString"/> instance on success.</param>
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/// <returns><c>true</c> if successfully parsed.</returns>
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public static bool TryParse(string? value, out IndirectString loc)
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{
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loc = new IndirectString(value);
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return loc.IsValid || value != null;
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}
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[DllImport("shlwapi.dll", SetLastError = false, ExactSpelling = true)]
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private static extern HRESULT SHLoadIndirectString([MarshalAs(UnmanagedType.LPWStr)] string pszSource,
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[Out, MarshalAs(UnmanagedType.LPWStr)] StringBuilder pszOutBuf, uint cchOutBuf, IntPtr ppvReserved = default);
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}
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internal class IndirectStringTypeConverter : ExpandableObjectConverter
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{
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public override bool CanConvertFrom(ITypeDescriptorContext? context, Type sourceType) =>
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sourceType == typeof(string) || base.CanConvertFrom(context, sourceType);
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public override bool CanConvertTo(ITypeDescriptorContext? context, Type? destType) =>
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destType == typeof(InstanceDescriptor) || destType == typeof(string) || base.CanConvertTo(context, destType);
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public override object? ConvertFrom(ITypeDescriptorContext? context, CultureInfo? culture, object value) =>
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value is string s ? IndirectString.TryParse(s, out var loc) ? loc : null : base.ConvertFrom(context, culture, value);
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public override object? ConvertTo(ITypeDescriptorContext? context, CultureInfo? info, object? value, Type destType)
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{
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if (destType == typeof(string) && value is IndirectString s)
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return s.RawValue;
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return destType == typeof(InstanceDescriptor)
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? new InstanceDescriptor(typeof(IndirectString).GetConstructor(new Type[0]), null, false)
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: base.ConvertTo(context, info, value, destType);
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}
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}
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} |