Undo and Redo the "Easy" Way

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20 Jun 2004CPOL22 min read

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This article introduces a simple approach to in-memory transactions that can be used to implement Undo and Redo. The technique uses SEH and Virtual Memory and requires only STL and Win32.

transactions_mfc_demo.zip
- Common
  - CER
  - Curve Simplification
  - Transactions
  - Utilities
    - Result.h
    - Types.h
- DrawFunc
  - DrawFunc.cpp
  - DrawFunc.h
  - DrawFunc.rc
  - DrawFunc.sln
  - DrawFunc.vcproj
  - resource.h
  - StdAfx.cpp
  - StdAfx.h
- DrawIt
  - DrawIt.cpp
  - DrawIt.h
  - DrawIt.rc
  - DrawIt.sln
  - DrawIt.vcproj
  - DrawItAPI.h
  - DrawItDoc.cpp
  - DrawItDoc.h
  - DrawItView.cpp
  - DrawItView.h
  - MainFrm.cpp
  - MainFrm.h
  - res
    - DrawIt.ico
    - DrawIt.rc2
    - DrawItDoc.ico
    - html1.htm
    - Toolbar.bmp
    - vssver.scc
  - Resource.h
  - StdAfx.cpp
  - StdAfx.h
- Transactions.htm
- Transactions.jpg
transactions_mfc_mdi_demo.zip
- CrashFileNames.h
- ExceptionHandler.cpp
- ExceptionHandler.h
- GetWinVer.cpp
- GetWinVer.h
- MiniVersion.cpp
- MiniVersion.h
- DPHull.cpp
- DPHull.h
- DPHullGL.cpp
- DPHullGL.h
- PathHull.cpp
- PathHull.h
- Allocator7.h
- avl_tree.h
- Compress.cpp
- Compress.h
- MemManager7.cpp
- MemManager7.h
- Result.h
- Types.h
- DrawFunc.cpp
- DrawFunc.h
- DrawFunc.rc
- DrawFunc.sln
- DrawFunc.vcproj
- resource.h
- StdAfx.cpp
- StdAfx.h
- DrawItMDI
  - ChildFrm.cpp
  - ChildFrm.h
  - DrawItDoc.cpp
  - DrawItDoc.h
  - DrawItMDI.cpp
  - DrawItMDI.h
  - DrawItMDI.rc
  - DrawItMDI.reg
  - DrawItMDI.sln
  - DrawItMDI.vcproj
  - DrawItView.cpp
  - DrawItView.h
  - MainFrm.cpp
  - MainFrm.h
  - ReadMe.txt
  - res
    - DrawItMDI.ico
    - DrawItMDI.manifest
    - DrawItMDI.rc2
    - DrawItMDIDoc.ico
    - mainfram.bmp
    - Toolbar.bmp
  - resource.h
  - stdafx.cpp
  - stdafx.h
- Transactions.htm
- Transactions.jpg
transactions_demo.zip
- Allocator7.h
- avl_tree.h
- Compress.cpp
- Compress.h
- MemManager7.cpp
- MemManager7.h
- Result.h
- Types.h
- MemTest
  - DoWork.cpp
  - DoWork2.cpp
  - MemTest.cpp
  - MemTest.sln
  - MemTest.vcproj
  - StdAfx.cpp
  - StdAfx.h
- Transactions.htm
- Transactions.jpg
transactions_src.zip
- Transactions.htm
- Transactions.jpg
- Transactions
transactions_complete.zip
- Bin
  - release
    - DrawFunc.dll
    - DrawIt.exe
    - DrawItMDI.exe
    - XCrashReport.exe
    - XCrashReport.ini
    - CrashFileNames.h
    - ExceptionHandler.cpp
    - ExceptionHandler.h
    - GetWinVer.cpp
    - GetWinVer.h
    - MiniVersion.cpp
    - MiniVersion.h
    - DPHull.cpp
    - DPHull.h
    - DPHullGL.cpp
    - DPHullGL.h
    - PathHull.cpp
    - PathHull.h
    - Allocator7.h
    - avl_tree.h
    - Compress.cpp
    - Compress.h
    - MemManager7.cpp
    - MemManager7.h
    - Result.h
    - Types.h
  - DrawFunc.cpp
  - DrawFunc.h
  - DrawFunc.rc
  - DrawFunc.sln
  - DrawFunc.vcproj
  - resource.h
  - StdAfx.cpp
  - StdAfx.h
  - DrawIt.cpp
  - DrawIt.h
  - DrawIt.rc
  - DrawIt.sln
  - DrawIt.vcproj
  - DrawItAPI.h
  - DrawItDoc.cpp
  - DrawItDoc.h
  - DrawItView.cpp
  - DrawItView.h
  - MainFrm.cpp
  - MainFrm.h
  - DrawIt.ico
  - DrawIt.rc2
  - DrawItDoc.ico
  - html1.htm
  - Toolbar.bmp
  - vssver.scc
  - Resource.h
  - StdAfx.cpp
  - StdAfx.h
  - ChildFrm.cpp
  - ChildFrm.h
  - DrawItDoc.cpp
  - DrawItDoc.h
  - DrawItMDI.cpp
  - DrawItMDI.h
  - DrawItMDI.rc
  - DrawItMDI.reg
  - DrawItMDI.sln
  - DrawItMDI.vcproj
  - DrawItView.cpp
  - DrawItView.h
  - MainFrm.cpp
  - MainFrm.h
  - ReadMe.txt
  - DrawItMDI.ico
  - DrawItMDI.manifest
  - DrawItMDI.rc2
  - DrawItMDIDoc.ico
  - mainfram.bmp
  - Toolbar.bmp
  - resource.h
  - stdafx.cpp
  - stdafx.h
  - DoWork.cpp
  - DoWork2.cpp
  - MemTest.cpp
  - MemTest.sln
  - MemTest.vcproj
  - StdAfx.cpp
  - StdAfx.h
- Transactions.htm
- Transactions.jpg

// stdafx.cpp : source file that includes just the standard includes
//	DrawFunc.pch will be the pre-compiled header
//	stdafx.obj will contain the pre-compiled type information

#include "stdafx.h"

// TODO: reference any additional headers you need in STDAFX.H
// and not in this file

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License

This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

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compiler

United States

A compiler warns of bogasity, ignore it at your peril. Unless you've done the compiler's job yourself, don't criticize it.

Undo and Redo the "Easy" Way

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