mirror of https://github.com/dahall/Vanara.git
48 lines
1.4 KiB
C#
48 lines
1.4 KiB
C#
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using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Reflection;
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using System.Text;
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using System.Threading.Tasks;
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using Vanara.Extensions;
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using Vanara.Extensions.Reflection;
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namespace Vanara.PInvoke;
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public class MsgParamsAttribute : Attribute
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{
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public MsgParamsAttribute(Type? wParamType, Type? lParamType)
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{
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WParamType = wParamType;
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LParamType = lParamType;
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WParamByRef = wParamType?.IsClass ?? false;
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LParamByRef = lParamType?.IsClass ?? false;
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}
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public MsgParamsAttribute()
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{
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WParamType = LParamType = null;
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WParamByRef = LParamByRef = false;
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}
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public Type? WParamType { get; }
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public bool WParamByRef { get; set; }
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public Type? LParamType { get; }
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public bool LParamByRef { get; set; }
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}
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public static class MsgExtensions
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{
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public static (object? wParam, object? lParam) GetParams<TEnum>(this MSG msg) where TEnum : Enum
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{
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MsgParamsAttribute? attr = typeof(TEnum).GetCustomAttribute<MsgParamsAttribute>();
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if (attr is null || (attr.WParamType == typeof(IntPtr) && attr.LParamType == typeof(IntPtr)))
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return (msg.wParam, msg.lParam);
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else
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{
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object? wParam = attr.WParamType is null ? null : attr.WParamByRef ? msg.wParam.ToStructure(attr.WParamType) : msg.wParam.ToInt32().ConvertTo(attr.WParamType);
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object? lParam = attr.LParamType is null ? null : attr.LParamByRef ? msg.lParam.ToStructure(attr.LParamType) : msg.lParam.ToInt32().ConvertTo(attr.LParamType);
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return (wParam, lParam);
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}
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}
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}
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