Hardware/PInvokeDelegateFactory.cs
author StephaneLenclud
Sun, 03 Feb 2013 18:01:50 +0100
branchMiniDisplay
changeset 433 090259cfd699
parent 344 3145aadca3d2
permissions -rw-r--r--
Adding SoundGraphDisplay and SensorFrontView classes.
They were respectively based on SystemTray and SensorNotifyIcon.
SoundGraphDisplay is now able to load iMONDisplay.dll providing it lives on your PATH.
Adding option to sensor context menu for adding it into FrontView.
     1 /*
     2  
     3   This Source Code Form is subject to the terms of the Mozilla Public
     4   License, v. 2.0. If a copy of the MPL was not distributed with this
     5   file, You can obtain one at http://mozilla.org/MPL/2.0/.
     6  
     7   Copyright (C) 2009-2012 Michael Möller <mmoeller@openhardwaremonitor.org>
     8 	
     9 */
    10 
    11 using System;
    12 using System.Collections.Generic;
    13 using System.Reflection;
    14 using System.Reflection.Emit;
    15 using System.Runtime.InteropServices;
    16 using OpenHardwareMonitor.Collections;
    17 
    18 namespace OpenHardwareMonitor.Hardware {
    19 
    20   internal static class PInvokeDelegateFactory {
    21 
    22     private static readonly ModuleBuilder moduleBuilder = 
    23       AppDomain.CurrentDomain.DefineDynamicAssembly(
    24         new AssemblyName("PInvokeDelegateFactoryInternalAssembly"),
    25         AssemblyBuilderAccess.Run).DefineDynamicModule(
    26         "PInvokeDelegateFactoryInternalModule");
    27 
    28     private static readonly IDictionary<Pair<DllImportAttribute, Type>, Type> wrapperTypes =
    29       new Dictionary<Pair<DllImportAttribute, Type>, Type>();
    30 
    31     public static void CreateDelegate<T>(DllImportAttribute dllImportAttribute,
    32       out T newDelegate) where T : class 
    33     {
    34       Type wrapperType;
    35       Pair<DllImportAttribute, Type> key =
    36         new Pair<DllImportAttribute, Type>(dllImportAttribute, typeof(T));
    37       wrapperTypes.TryGetValue(key, out wrapperType);
    38 
    39       if (wrapperType == null) {
    40         wrapperType = CreateWrapperType(typeof(T), dllImportAttribute);
    41         wrapperTypes.Add(key, wrapperType);
    42       }
    43 
    44       newDelegate = Delegate.CreateDelegate(typeof(T), wrapperType,
    45         dllImportAttribute.EntryPoint) as T;
    46     }
    47 
    48 
    49     private static Type CreateWrapperType(Type delegateType,
    50       DllImportAttribute dllImportAttribute) {
    51 
    52       TypeBuilder typeBuilder = moduleBuilder.DefineType(
    53         "PInvokeDelegateFactoryInternalWrapperType" + wrapperTypes.Count);
    54 
    55       MethodInfo methodInfo = delegateType.GetMethod("Invoke");
    56 
    57       ParameterInfo[] parameterInfos = methodInfo.GetParameters();
    58       int parameterCount = parameterInfos.GetLength(0);
    59 
    60       Type[] parameterTypes = new Type[parameterCount];
    61       for (int i = 0; i < parameterCount; i++)
    62         parameterTypes[i] = parameterInfos[i].ParameterType;
    63 
    64       MethodBuilder methodBuilder = typeBuilder.DefinePInvokeMethod(
    65         dllImportAttribute.EntryPoint, dllImportAttribute.Value,
    66         MethodAttributes.Public | MethodAttributes.Static |
    67         MethodAttributes.PinvokeImpl, CallingConventions.Standard,
    68         methodInfo.ReturnType, parameterTypes,
    69         dllImportAttribute.CallingConvention,
    70         dllImportAttribute.CharSet);
    71 
    72       foreach (ParameterInfo parameterInfo in parameterInfos)
    73         methodBuilder.DefineParameter(parameterInfo.Position + 1,
    74           parameterInfo.Attributes, parameterInfo.Name);
    75 
    76       if (dllImportAttribute.PreserveSig)
    77         methodBuilder.SetImplementationFlags(MethodImplAttributes.PreserveSig);
    78 
    79       return typeBuilder.CreateType();
    80     }
    81   }
    82 }