What are Delphi 7 and Delphi 2009 differences which deals with characters, strings, unicode and the like?

I had a class that only worked in Delphi 7 and after several attempts of converting it into Delphi 2009 we finally agreed to change o开发者_如何学JAVAur project into Delphi 7.

The project more or less done, but I want to give the 2009 thing another shot.

Aside from Sizeof(Char) equals 1 in Delphi 7 and 2 in Delphi 2009, what are other changes that I need to be aware of?

Additional: It might help to know what I'm converting into 2009, so HERE it is. It's the unit HanInput; part. It translates keys (in english) and outputs the Korean characters. The way he uses the indexes is really confusing, each Korean character HAD a size of 2 so a lot of that code must be changed.

Sadly, I don't understand Korean, so it's pretty hard for me to guess the some semblance of an algorithm.

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Dian you can check this paper Delphi and Unicode from Marco Cantù, wich explain in a great way the Unicode string support in Delphi.