Save/Load System with Version Compatibility | Duke Rabbit's Game Zone | 數位生活分享 | 痞客邦 | PIXNET

Sep 23 Tue 2008 11:31
Save/Load System with Version Compatibility

This system consists of 7 functions:

BeginSave(int iVersion);	// Saves current version
EndSave(void);	// End of a saving process
Save(Value);	// Save one value
BeginLoad(void);	// Loads file version
EndLoad(void);	// End of a loading process
Load(int iVersion, Value);	// Compares the versions in file and code, then loads value
Skip(int iStartVer, int iEndVer, Value);	// Skips one value in file

Useage:

Save

BeginSave(iVerCurrent);
Save(Value);
EndSave();

Load

Initialize(Value);
BeginLoad(void);
Load(iVerSaved, Value);
EndLoad(void);

Use Case:

Version 0

Save	Load
BeginSave(0); Save(a); EndSave();	Initialize(a); BeginLoad(void); Load(0, a); EndLoad(void);

Version 1(Add a New Variable)

Save	Load
BeginSave(1); Save(a); Save(b); EndSave();	Initialize(a, b); BeginLoad(void); Load(0, a); Load(1, b); // See Comment EndLoad(void);
Comment
Load(1, b);	The saving version of variable b is 1. When loading version 0 file, this call will do nothing.

Version 2(Add a New Variable)

Save	Load
BeginSave(2); Save(a); Save(b); Save(c); EndSave();	Initialize(a, b, c); BeginLoad(void); Load(0, a); Load(1, b); Load(2, c); // See Comment EndLoad(void);
Comment
Load(2, c);	The saving version of variable b is 1. When loading version 0 file, this call will do nothing.

Version 3(Remove a variable)

Save	Load
BeginSave(3); Save(a); Save(c); EndSave();	Initialize(a, c); BeginLoad(void); Load(0, a); Skip(1, 2, b); // See Comment Load(2, c); EndLoad(void);
Comment
Skip(1, 2, b);	When loading file version 1 to 2, This call will load the value then throw it away. When loading other versions, it will do nothing.

Version 4(Reuse a variable)

Save	Load
BeginSave(4); Save(a); Save(c); Save(b); EndSave();	Initialize(a, b, c); BeginLoad(void); Load(0, a); Skip(1, 2, b); Load(2, c); Load(4, b); EndLoad(void);

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Duke Rabbit's Game Zone

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