• <ins id="pjuwb"></ins>
    <blockquote id="pjuwb"><pre id="pjuwb"></pre></blockquote>
    <noscript id="pjuwb"></noscript>
          <sup id="pjuwb"><pre id="pjuwb"></pre></sup>
            <dd id="pjuwb"></dd>
            <abbr id="pjuwb"></abbr>

            看到有前輩寫(xiě)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(jiàn)
            http://www.boost.org/libs/serialization/doc/codecvt.html

            posted on 2006-02-15 17:19 張沈鵬 閱讀(2667) 評(píng)論(2)  編輯 收藏 引用
            Comments

            只有注冊(cè)用戶登錄后才能發(fā)表評(píng)論。
            網(wǎng)站導(dǎo)航: 博客園   IT新聞   BlogJava   博問(wèn)   Chat2DB   管理


             
            亚洲AV乱码久久精品蜜桃| 亚洲国产成人精品91久久久| 麻豆av久久av盛宴av| 色婷婷久久久SWAG精品| 久久国产精品一国产精品金尊| 99精品国产在热久久无毒不卡 | 精品久久亚洲中文无码| 久久天天躁狠狠躁夜夜不卡 | 久久久精品午夜免费不卡| 性做久久久久久久| 人妻无码精品久久亚瑟影视| 国产激情久久久久影院老熟女| 国产成人久久久精品二区三区| 国产精品久久久久久福利69堂| 91久久精品视频| 2021久久精品免费观看| 久久精品夜夜夜夜夜久久| 亚洲国产成人久久精品影视| 久久有码中文字幕| 国产午夜福利精品久久2021| 国产69精品久久久久9999| 中文字幕无码免费久久| 久久国产精品久久| 伊人久久大香线蕉综合Av | 久久精品国产精品亚洲毛片| 久久久女人与动物群交毛片| 久久精品无码专区免费| 久久婷婷激情综合色综合俺也去| 亚洲国产精品一区二区三区久久 | 亚洲一本综合久久| 国产三级久久久精品麻豆三级| 午夜精品久久久久9999高清| 久久91综合国产91久久精品| 久久亚洲美女精品国产精品| 久久亚洲熟女cc98cm| 人妻精品久久久久中文字幕一冢本| 久久久久久青草大香综合精品| 久久青青草原精品国产软件 | 久久香蕉一级毛片| 久久久久久一区国产精品| 国产aⅴ激情无码久久|