文件列表:

C++、MFC源代码Singleton_demo (0, 2004-07-30)
C++、MFC源代码Singleton_demo\Singleton.clw (1786, 1998-09-18)
C++、MFC源代码Singleton_demo\Singleton.h (1287, 1998-09-18)
C++、MFC源代码Singleton_demo\Singleton.cpp (4488, 1998-09-18)
C++、MFC源代码Singleton_demo\StdAfx.h (705, 1998-09-18)
C++、MFC源代码Singleton_demo\StdAfx.cpp (413, 1998-09-18)
C++、MFC源代码Singleton_demo\MainFrm.h (1194, 1998-09-18)
C++、MFC源代码Singleton_demo\MainFrm.cpp (1673, 1998-09-18)
C++、MFC源代码Singleton_demo\SingletonDoc.h (1241, 1998-09-18)
C++、MFC源代码Singleton_demo\SingletonDoc.cpp (2002, 1998-09-18)
C++、MFC源代码Singleton_demo\SingletonView.h (1756, 1998-09-18)
C++、MFC源代码Singleton_demo\SingletonView.cpp (4225, 1998-09-18)
C++、MFC源代码Singleton_demo\Singleton.aps (43424, 1998-09-18)
C++、MFC源代码Singleton_demo\resource.h (783, 1998-09-18)
C++、MFC源代码Singleton_demo\Singleton.rc (10649, 1998-09-18)
C++、MFC源代码Singleton_demo\Singleton.ncb (181248, 1998-09-21)
C++、MFC源代码Singleton_demo\Singleton.mak (12076, 1998-09-18)
C++、MFC源代码Singleton_demo\MsgHndlr.cpp (5208, 1998-09-18)
C++、MFC源代码Singleton_demo\MsgHndlr.h (2153, 1998-09-18)
C++、MFC源代码Singleton_demo\SmpHndlr.cpp (1431, 1998-09-18)
C++、MFC源代码Singleton_demo\SmpHndlr.h (957, 1998-09-18)
C++、MFC源代码Singleton_demo\LogHndlr.cpp (2488, 1998-09-18)
C++、MFC源代码Singleton_demo\LogHndlr.h (1123, 1998-09-18)
C++、MFC源代码Singleton_demo\ObjReg.h (1457, 1998-09-18)
C++、MFC源代码Singleton_demo\MsgHndlrReg.h (788, 1998-09-18)
C++、MFC源代码Singleton_demo\Singleton.mdp (37376, 1998-09-21)
C++、MFC源代码Singleton_demo\SmtClnr.h (1031, 1998-09-18)
C++、MFC源代码Singleton_demo\res (0, 2004-07-30)
C++、MFC源代码Singleton_demo\res\Singleton.rc2 (401, 1998-08-19)
C++、MFC源代码Singleton_demo\res\SingletonDoc.ico (1078, 1998-08-19)
C++、MFC源代码Singleton_demo\res\Singleton.ico (1078, 1998-08-19)

======================================================================== Readme.Txt - Singleton Classes ======================================================================== This file ( Readme.txt ) contains the following 1. About this application 2. Usage 3. File List 4. Known Bug 1. About this application ========================= This is a sample application to emphasize the concept of Singleton classes explained in my article, "Creating Singleton Objects Using Visual C++". A class which has only one object of its type is called a "Singleton Class". In this application, the concept of Singleton is explained using a simple "Message handler" example. Message handlers can be used for formatting or logging application messages, before displaying the messages to the user. Three message handler classes are used in this application, which includes a ) CMsgHndlr - Base class for message handlers. It is responsible for creating the required message handler object when GetMsgHndlr method is called. It is also responsible for notifying the window with the message when HandleMessage method is called. b ) CSmpHndlr - This class is derived from CMsgHndlr and it is responsible for displaying the message in a message box when HandleMessage method is called. c ) CLogHndlr - This class is derived from CMsgHndlr, it is responsible for logging and displaying the message in a message box when HandleMessage method is called. Message handlers register their runtime class information with a message handler registry. CMsgHndlrRegistry, a template class derived from CObjRegistry is used to store these runtime class information. CMsgHndlr uses "MSGHNDLR" as the key to register its runtime class. CSmpHndlr registers its runtime class using "SMPHNDLR" as the key and CLogHndlr uses "LOGHNDLR" as the key. This key is passed as a command-line argument to the application to select and create the required message handler object. A message handler class can register or unregister itself without affecting other message handlers. So, a new message handler can register itself without affecting any other source files of the application. By passing the key as a command-line argument, the choice of message handler can be made at runtime. NOTE : In this application, I've included the message handler classes as part of the project itself. I've to recompile the project, when I add a new message handler. But, message handler classes can also be implemented as a separate DLL. Since, the message handler class information is registered only at run time, a new message handler class added to the DLL can be used without recompiling the application. CSmartCleaner is used by message handler classes to do the object cleanup when the application terminates. This application is developed using Visual C++ 4.2. This project is compiled WITHOUT any optimization because of a known problem with the optimizer. This problem is explained at the end of this file ( see Known Bug ). 2. Usage ======== User should be able select the required message handler at runtime. This application takes a key as a command-line argument to select the required message handler. As explained earlier, use "MSGHNDLR" as key to use CMsgHndlr object, use "SMPHNDLR" as key to use CSmpHndlr object and use "LOGHNDLR" as key to use CLogHndlr object. 3. File List ============ ///////////////////////////////////////////////////////////////////////////// Message handler files: MsgHndlr.h, MsgHndlr.cpp - the Singleton base class for message handlers. These files contain CMsgHndlr class. SmpHndlr.h, SmpHndlr.cpp - These files contain CSmpHndlr class. This class is derived from CMsgHndlr. LogHndlr.h, LogHndlr.cpp - These files contain CLogHndlr class. This class is derived from CMsgHndlr. ///////////////////////////////////////////////////////////////////////////// Registration files ObjReg.h - This file contains CObjRegistry class. Object registry is used for storing runtime class information of the objects. Given the key or the class name, CObjRegistry queries and returns the Runtime Class to the client. MsgHndlrReg.h - This file contains CMsgHndlrRegistry class. This class is derived from CObjRegistry. Runtime class information of message handlers are registered to CObjRegistry via this class. ///////////////////////////////////////////////////////////////////////////// Smart cleaner file: SmtClnr.h - This file contains CSmartCleaner class. This class is responsible for the cleanup of the object associated with it during its destruction. ///////////////////////////////////////////////////////////////////////////// Application files: Singleton.h This is the main header file for the application. It includes other project specific headers (including Resource.h) and declares the CSingletonApp application class. Singleton.cpp This is the main application source file that contains the application class CSingletonApp. Singleton.rc This is a listing of all of the Microsoft Windows resources that the program uses. It includes the icons, bitmaps, and cursors that are stored in the RES subdirectory. res\Singleton.ico This is an icon file, which is used as the application's icon. This icon is included by the main resource file Singleton.rc. res\Singleton.rc2 This file contains resources that are not edited by Microsoft Developer Studio. Singleton.clw This file contains information used by ClassWizard to edit existing classes or add new classes. ClassWizard also uses this file to store information needed to create and edit message maps and dialog data maps and to create prototype member functions. ///////////////////////////////////////////////////////////////////////////// For the main frame window: MainFrm.h, MainFrm.cpp These files contain the frame class CMainFrame, which is derived from CFrameWnd and controls all SDI frame features. ///////////////////////////////////////////////////////////////////////////// Document and view files: SingletonDoc.h, SingletonDoc.cpp - the document These files contain CSingletonDoc class. SingletonView.h, SingletonView.cpp - the view of the document These files contain CSingletonView class. ///////////////////////////////////////////////////////////////////////////// Other standard files: StdAfx.h, StdAfx.cpp These files are used to build a precompiled header (PCH) file named Singleton.pch and a precompiled types file named StdAfx.obj. Resource.h This is the standard header file, which defines new resource IDs. ///////////////////////////////////////////////////////////////////////////// 4. Known Bug ============ This project is compiled WITHOUT any optimization, because of a known problem with the Visual C++ optimizer when working on local static objects. Refer to the article, "BUG: Static Object No Longer Static When Optimized" ( PSS ID Number: Q119328 ) in Visual C++ Knowledge Base and Bug Lists, for more details.

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