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Index > Windows > what is code page?

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b1528932



Joined: 21 May 2010
Posts: 287
b1528932
I cant understand concept of code page.

For me, code page is set of 256 characters (quoted from msdn).

If i want to output character XX, function lookup its position in the table and draw corresponding glyph. This is by using ansi functions (xxxA). Wheni use unicode function, always get same glyph for character.


Qs:
- what is the purpose of code page in console input buffer?
- does unicode functions (xxxW) use code pages?
Post 16 Oct 2010, 14:01
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baldr



Joined: 19 Mar 2008
Posts: 1651
baldr
b1528932,

Console input code pade tells you how to interpret KEY_EVENT_RECORD.uChar.AsciiChar field from ReadConsoleInputA() for values outside ASCII range. There are multi-byte character sets too: Japanese Shift-JIS, Chinese Big5 and GBK, for example.

xxxW functions use UTF-16 LE encoding (code page 1200) which uses surrogate pairs to represent some Unicode code points. It can be seen as they use one codepage.
Post 16 Oct 2010, 16:42
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b1528932



Joined: 21 May 2010
Posts: 287
b1528932
Ok, so how actually goes this translation?

I want to output ascii 0x90.
xxA function convert it into utf16 character using code page, then write proper data into CHAR_INFO.

when i use xxW function, there is no translation at all, data just go as i input?

same for input, just lower layer receive KEY_EVENT_RECORD.uChar.UnicodeChar depending on code page?
Post 16 Oct 2010, 20:53
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