为什么有些字符常量为1字节宽,有些则为2字节宽？

Question

我以为我开始理解Unicode了,但这比我好:

const
c1 = #1;   --> SizeOf() = 2
c2 = #33;  --> SizeOf() = 2
c3 = #127; --> SizeOf() = 2
c4 = #128; --> SizeOf() = 1
c5 = #160; --> SizeOf() = 1 
c6 = #161; --> SizeOf() = 1 
c7 = #255; --> SizeOf() = 1 

谁能解释一下？Delphi XE2,默认Windows-1252代码页

谢谢Jan

Answer 1

记录在案 - 请参阅$ HIGHCHARUNICODE指令