mirror of
https://github.com/openhardwaremonitor/openhardwaremonitor
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90 lines
3.4 KiB
C#
90 lines
3.4 KiB
C#
/*
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This Source Code Form is subject to the terms of the Mozilla Public
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License, v. 2.0. If a copy of the MPL was not distributed with this
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file, You can obtain one at http://mozilla.org/MPL/2.0/.
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Copyright (C) 2009-2012 Michael Möller <mmoeller@openhardwaremonitor.org>
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*/
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using System;
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using System.Collections.Generic;
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using System.Reflection;
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using System.Reflection.Emit;
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using System.Runtime.InteropServices;
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using OpenHardwareMonitor.Collections;
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namespace OpenHardwareMonitor.Hardware {
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internal static class PInvokeDelegateFactory {
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private static readonly ModuleBuilder moduleBuilder =
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AppDomain.CurrentDomain.DefineDynamicAssembly(
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new AssemblyName("PInvokeDelegateFactoryInternalAssembly"),
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AssemblyBuilderAccess.Run).DefineDynamicModule(
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"PInvokeDelegateFactoryInternalModule");
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private static readonly IDictionary<Pair<DllImportAttribute, Type>, Type> wrapperTypes =
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new Dictionary<Pair<DllImportAttribute, Type>, Type>();
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public static void CreateDelegate<T>(DllImportAttribute dllImportAttribute,
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out T newDelegate, DllImportSearchPath dllImportSearchPath =
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DllImportSearchPath.System32) where T : class
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{
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Type wrapperType;
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Pair<DllImportAttribute, Type> key =
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new Pair<DllImportAttribute, Type>(dllImportAttribute, typeof(T));
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wrapperTypes.TryGetValue(key, out wrapperType);
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if (wrapperType == null) {
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wrapperType = CreateWrapperType(typeof(T), dllImportAttribute, dllImportSearchPath);
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wrapperTypes.Add(key, wrapperType);
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}
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newDelegate = Delegate.CreateDelegate(typeof(T), wrapperType,
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dllImportAttribute.EntryPoint) as T;
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}
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private static Type CreateWrapperType(Type delegateType,
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DllImportAttribute dllImportAttribute,
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DllImportSearchPath dllImportSearchPath)
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{
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TypeBuilder typeBuilder = moduleBuilder.DefineType(
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"PInvokeDelegateFactoryInternalWrapperType" + wrapperTypes.Count);
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MethodInfo methodInfo = delegateType.GetMethod("Invoke");
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ParameterInfo[] parameterInfos = methodInfo.GetParameters();
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int parameterCount = parameterInfos.GetLength(0);
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Type[] parameterTypes = new Type[parameterCount];
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for (int i = 0; i < parameterCount; i++)
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parameterTypes[i] = parameterInfos[i].ParameterType;
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MethodBuilder methodBuilder = typeBuilder.DefinePInvokeMethod(
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dllImportAttribute.EntryPoint, dllImportAttribute.Value,
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MethodAttributes.Public | MethodAttributes.Static |
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MethodAttributes.PinvokeImpl, CallingConventions.Standard,
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methodInfo.ReturnType, parameterTypes,
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dllImportAttribute.CallingConvention,
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dllImportAttribute.CharSet);
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methodBuilder.SetCustomAttribute(new CustomAttributeBuilder(
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typeof(DefaultDllImportSearchPathsAttribute).GetConstructor(
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new Type[] { typeof(DllImportSearchPath) }),
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new object[] { dllImportSearchPath }));
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foreach (ParameterInfo parameterInfo in parameterInfos)
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methodBuilder.DefineParameter(parameterInfo.Position + 1,
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parameterInfo.Attributes, parameterInfo.Name);
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if (dllImportAttribute.PreserveSig)
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methodBuilder.SetImplementationFlags(MethodImplAttributes.PreserveSig);
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return typeBuilder.CreateType();
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}
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}
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}
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