Sample Code
Windows Driver Samples/ Toaster Sample Driver/ C++/ umdf/ Toastmon/ comsup.h/
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 | /*++ Copyright (C) Microsoft Corporation, All Rights Reserved Module Name: ComSup.h Abstract: This module contains classes and functions use for providing COM support code. Environment: Windows User-Mode Driver Framework (WUDF) --*/ #pragma once // // Forward type declarations. They are here rather than in internal.h as // you only need them if you choose to use these support classes. // typedef class CUnknown *PCUnknown; typedef class CClassFactory *PCClassFactory; // // Base class to implement IUnknown. You can choose to derive your COM // classes from this class, or simply implement IUnknown in each of your // classes. // class CUnknown : public IUnknown { // // Private data members and methods. These are only accessible by the methods // of this class. // private : // // The reference count for this object. Initialized to 1 in the // constructor. // LONG m_ReferenceCount; // // Protected data members and methods. These are accessible by the subclasses // but not by other classes. // protected : // // The constructor and destructor are protected to ensure that only the // subclasses of CUnknown can create and destroy instances. // CUnknown( VOID ); // // The destructor MUST be virtual. Since any instance of a CUnknown // derived class should only be deleted from within CUnknown::Release, // the destructor MUST be virtual or only CUnknown::~CUnknown will get // invoked on deletion. // // If you see that your CMyDevice specific destructor is never being // called, make sure you haven't deleted the virtual destructor here. // virtual ~CUnknown( VOID ) { // Do nothing } // // Public Methods. These are accessible by any class. // public : IUnknown * QueryIUnknown( VOID ); // // COM Methods. // public : // // IUnknown methods // virtual ULONG STDMETHODCALLTYPE AddRef( VOID ); virtual ULONG STDMETHODCALLTYPE Release( VOID ); virtual HRESULT STDMETHODCALLTYPE QueryInterface( _In_ REFIID InterfaceId, _Out_ PVOID *Object ); }; // // Class factory support class. Create an instance of this from your // DllGetClassObject method and modify the implementation to create // an instance of your driver event handler class. // class CClassFactory : public CUnknown, public IClassFactory { // // Private data members and methods. These are only accessible by the methods // of this class. // private : // // The lock count. This is shared across all instances of IClassFactory // and can be queried through the public IsLocked method. // static LONG s_LockCount; // // Public Methods. These are accessible by any class. // public : IClassFactory * QueryIClassFactory( VOID ); // // COM Methods. // public : // // IUnknown methods // virtual ULONG STDMETHODCALLTYPE AddRef( VOID ) { return __super::AddRef(); } _At_( this , __drv_freesMem(object)) virtual ULONG STDMETHODCALLTYPE Release( VOID ) { return __super::Release(); } virtual HRESULT STDMETHODCALLTYPE QueryInterface( _In_ REFIID InterfaceId, _Out_ PVOID *Object ); // // IClassFactory methods. // virtual HRESULT STDMETHODCALLTYPE CreateInstance( _In_opt_ IUnknown *OuterObject, _In_ REFIID InterfaceId, _Out_ PVOID *Object ); virtual HRESULT STDMETHODCALLTYPE LockServer( _In_ BOOL Lock ); }; |
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