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            看到有前輩寫了一個(gè)UTF-8與UNICODE相互轉(zhuǎn)換的代碼,順便提一下,希望可以給大家提供一點(diǎn)幫助.
            下面是一些編碼格式的bit長(zhǎng)

            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中提供了一個(gè)UTF-8 Codecvt Facet,可以在utf8和UCS-4(Unicode-32)之間轉(zhuǎn)換.
            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 轉(zhuǎn)換為 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));
              }

              // 讀入 UTF-8 ,轉(zhuǎn)換為 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詳見
            http://www.boost.org/libs/serialization/doc/codecvt.html

            posted on 2006-02-15 17:19 張沈鵬 閱讀(2668) 評(píng)論(2)  編輯 收藏 引用
            Comments

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