mirror of https://github.com/dahall/Vanara.git
51 lines
2.3 KiB
C#
51 lines
2.3 KiB
C#
using System;
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using System.Runtime.InteropServices;
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using Vanara.Extensions;
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namespace Vanara.InteropServices
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{
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/// <summary>Marshals strings that are allocated by native code and must be freed using LocalFree after use.</summary>
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/// <seealso cref="System.Runtime.InteropServices.ICustomMarshaler"/>
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public class LocalStringMarshaler : ICustomMarshaler
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{
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private static readonly LocalMemoryMethods mm = new LocalMemoryMethods();
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private readonly CharSet charSet = CharSet.Unicode;
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private LocalStringMarshaler(string cookie)
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{
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if (string.IsNullOrEmpty(cookie)) return;
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try { charSet = (CharSet)Enum.Parse(typeof(CharSet), cookie, true); } catch { }
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}
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/// <summary>Gets the instance.</summary>
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/// <param name="cookie">The cookie.</param>
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/// <returns>A new instance of this class.</returns>
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public static ICustomMarshaler GetInstance(string cookie) => new LocalStringMarshaler(cookie);
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/// <summary>Performs necessary cleanup of the managed data when it is no longer needed.</summary>
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/// <param name="ManagedObj">The managed object to be destroyed.</param>
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public void CleanUpManagedData(object ManagedObj) { }
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/// <summary>Performs necessary cleanup of the unmanaged data when it is no longer needed.</summary>
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/// <param name="pNativeData">A pointer to the unmanaged data to be destroyed.</param>
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public void CleanUpNativeData(IntPtr pNativeData)
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{
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mm.FreeMem(pNativeData);
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}
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/// <summary>Returns the size of the native data to be marshaled.</summary>
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/// <returns>The size in bytes of the native data.</returns>
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public int GetNativeDataSize() => IntPtr.Size;
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/// <summary>Converts the managed data to unmanaged data.</summary>
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/// <param name="ManagedObj">The managed object to be converted.</param>
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/// <returns>Returns the COM view of the managed object.</returns>
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public IntPtr MarshalManagedToNative(object ManagedObj) => StringHelper.GetCharSize(charSet) == 2 ? mm.AllocStringUni(ManagedObj as string) : mm.AllocStringAnsi(ManagedObj as string);
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/// <summary>Converts the unmanaged data to managed data.</summary>
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/// <param name="pNativeData">A pointer to the unmanaged data to be wrapped.</param>
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/// <returns>Returns the managed view of the COM data.</returns>
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public object MarshalNativeToManaged(IntPtr pNativeData) => StringHelper.GetString(pNativeData, charSet);
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}
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}
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