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Programs Written in earlier versions are migrated to later versions ???

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Programs Written in earlier versions are migrated to later versions ??? Delphi/Windows SDK/API
Http://www.delphi2007.net/DelphiBase/html/delphi_20061220174703101.html
For example, D5-> D7
1. How to migrate?
2. Is there a migration wizard?
3. What preparations or changes should be made?
4. What are precautions?

This is a bit difficult...
The key is that you use those components.
It is better to rewrite it. It is estimated that there are many ready-made items that can be used directly.

D5-> D7 is easy to Compile directly. If there is an error, just make a slight change.
D5 click-> D7 is troublesome. The higher version-> the lower version is more painful and can only be rewritten.

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