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Undo and Redo the "Easy" Way

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20 Jun 2004CPOL22 min read 289.8K   8.6K   114  
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.
// ExceptionHandler.h  Version 1.1
//
// Copyright � 1998 Bruce Dawson
//
// Author:       Bruce Dawson
//               brucedawson@cygnus-software.com
//
// Modified by:  Hans Dietrich
//               hdietrich2@hotmail.com
//
// A paper by the original author can be found at:
//     http://www.cygnus-software.com/papers/release_debugging.html
//
///////////////////////////////////////////////////////////////////////////////

#ifndef	EXCEPTIONHANDLER_H
#define	EXCEPTIONHANDLER_H

// We forward declare PEXCEPTION_POINTERS so that the function
// prototype doesn't needlessly require windows.h.

typedef struct _EXCEPTION_POINTERS EXCEPTION_POINTERS, *PEXCEPTION_POINTERS;

int __cdecl RecordExceptionInfo(PEXCEPTION_POINTERS data, const char *Message);


/*
// Sample usage - put the code that used to be in main into HandledMain.
// To hook it in to an MFC app add ExceptionAttacher.cpp from the mfctest
// application into your project.
int main(int argc, char *argv[])
{
	int Result = -1;
	__try
	{
		Result = HandledMain(argc, argv);
	}
	__except(RecordExceptionInfo(GetExceptionInformation(), "main thread"))
	{
		// Do nothing here - RecordExceptionInfo() has already done
		// everything that is needed. Actually this code won't even
		// get called unless you return EXCEPTION_EXECUTE_HANDLER from
		// the __except clause.
	}
	return Result;
}
*/

#endif

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


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United States 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.

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