看到有前辈写了一个UTF-8与UNICODE相互转换的代码,顺便提一下,希望可以给大家提供一点帮助.
下面是一些编码格式的bit长

Examples of fixed-width encoding forms:

Type Each character
encoded as
Notes
  7-bit a single 7-bit quantity example: ISO 646
  8-bit G0/G1 a single 8-bit quantity with constraints on use of C0 and C1 spaces
  8-bit a single 8-bit quantity with no constraints on use of C1 space
  8-bit EBCDIC a single 8-bit quantity with the EBCDIC conventions rather than ASCII conventions
16-bit (UCS-2) a single 16-bit quantity within a code space of 0..FFFF
32-bit (UCS-4) a single 32-bit quantity within a code space 0..7FFFFFFF
32-bit (UTF-32) a single 32-bit quantity within a code space of 0..10FFFF
16-bit DBCS process code a single 16-bit quantity example: UNIX widechar implementations of Asian CCS's
32-bit DBCS process code a single 32-bit quantity example: UNIX widechar implementations of Asian CCS's
DBCS Host two 8-bit quantities following IBM host conventions

Examples of variable-width encoding forms:

Name Characters are encoded as Notes
UTF-8 a mix of one to four 8-bit code units in Unicode
and one to six code units in 10646
used only with Unicode/10646
UTF-16 a mix of one to two 16 bit code units used only with Unicode/10646

Boost中提供了一个UTF-8 Codecvt Facet,可以在utf8和UCS-4(Unicode-32)之间转换.
使用方式如下

  //...
  // My encoding type
  typedef wchar_t ucs4_t;

  std::locale old_locale;
  std::locale utf8_locale(old_locale,new utf8_codecvt_facet<ucs4_t>);

  // Set a New global locale
  std::locale::global(utf8_locale);

  //  UCS-4 转换为 UTF-8
  {
    std::wofstream ofs("data.ucd");
    ofs.imbue(utf8_locale);
    std::copy(ucs4_data.begin(),ucs4_data.end(),
          std::ostream_iterator<ucs4_t,ucs4_t>(ofs));
  }

  // 读入 UTF-8 ,转换为 UCS-4 
  std::vector<ucs4_t> from_file;
  {
    std::wifstream ifs("data.ucd");
    ifs.imbue(utf8_locale);
    ucs4_t item = 0;
    while (ifs >> item) from_file.push_back(item);
  }
  //...
UTF-8 Codecvt Facet详见
http://www.boost.org/libs/serialization/doc/codecvt.html

posted on 2006-02-15 17:19 张沈鹏 阅读(2350) 评论(2)  编辑 收藏 引用
Comments
  • # re: Boost:UTF-8 Codecvt Facet(unicode 和 utf-8 之间相互转码)
    无名高手
    Posted @ 2006-02-24 14:18
    无知少年,看你好学,指点你一下吧

    Unicode Technical Report #17 Character Encoding Mode
    http://www.unicode.org/unicode/reports/tr17

    至于更高层次(更简单)的要诀,呵呵,不告诉你~~  回复  更多评论   
  • # re: Boost:UTF-8 Codecvt Facet(unicode 和 utf-8 之间相互转码)
    张沈鹏
    Posted @ 2006-02-25 10:01
    至于更高层次(更简单)的要诀是什么?望高手指教,谢谢  回复  更多评论   

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