{"id":44,"date":"2017-04-19T17:42:41","date_gmt":"2017-04-19T09:42:41","guid":{"rendered":"http:\/\/www.myway5.com\/?p=44"},"modified":"2018-08-17T12:49:25","modified_gmt":"2018-08-17T04:49:25","slug":"c-plus-plus-chinese-split","status":"publish","type":"post","link":"https:\/\/www.myway5.com\/index.php\/2017\/04\/19\/c-plus-plus-chinese-split\/","title":{"rendered":"c++\u4e2d\u7684\u4e2d\u6587\u5b57\u7b26\u5206\u5272"},"content":{"rendered":"

\u5728utf-8\u7f16\u7801\u7684\u524d\u63d0\u4e0b\uff0c\u4e00\u4e2a\u5b57\u7b26\u53ef\u80fd\u5360\u7528\u7684\u7a7a\u95f4\u4e3a1~4\u4e2achar\uff0c\u7531\u4e8e\u8fd9\u79cd\u4e0d\u786e\u5b9a\u7684\u5b57\u7b26\u957f\u5ea6\u5bfc\u81f4\u5728utf-8\u7f16\u7801\u7684string\u4e2d\uff0c\u65e0\u6cd5\u76f4\u63a5\u4f7f\u7528substr\u8fdb\u884c\u5b57\u7b26\u4e32\u5206\u5272\u3002<\/p>\n

\u89e3\u51b3\u7684\u65b9\u6848\u7684\u5173\u952e\u5728\u4e8e\u5229\u7528utf-8\u7f16\u7801\u7684\u7279\u70b9\uff0cutf-8\u7684\u7b2c\u4e00\u4e2a\u5b57\u7b26\u7684\u524d\u7f00\u8fde\u7eed\u4e3a1\u7684\u4e2a\u6570\u4ee3\u8868\u8fd9\u4e2a\u201d\u5b57\u201c\u5360\u7528\u7684\u5b57\u7b26\u6570\u91cf\uff0c\u5f53\u53ea\u6709\u4e00\u4e2a\u5b57\u7b26\u65f6\uff0c\u7b2c\u4e00\u4e2a\u5b57\u7b26\u7684\u7b2c\u4e00\u4f4d\u4e3a0\u3002\u5177\u4f53\u7684\u8bf4\u660e\u53ef\u4ee5\u53c2\u8003\u8fd9\u7bc7\u6587\u7ae0\u3002http:\/\/www.ruanyifeng.com\/blog\/2007\/10\/ascii_unicode_and_utf-8.html<\/p>\n

\u8fd9\u91cc\u4e3b\u8981\u8bf4\u660e\u600e\u4e48\u5229\u7528\u4ee3\u7801\u89e3\u51b3\u8fd9\u4e2a\u95ee\u9898<\/p>\n

int getUtf8CharLength(char c){\n    int len = 0;\n    if(c > 0){              \/\/\u5229\u7528\u8ba1\u7b97\u673a\u4e2d\u6570\u5b57\u7684\u5b58\u50a8\u7279\u70b9\uff0c\u7b2c\u4e00\u4f4d\u4e3a1\u4e3a\u8d1f\uff0c\u7b2c\u4e00\u4f4d\u4e3a0\u4e3a\u6b63\uff0c\u5f88\u5bb9\u6613\u5224\u65ad\n        return len + 1;     \/\/\u7b2c\u4e00\u4f4d\u4e3a0\u65f6\u4e3a\u7279\u6b8a\u60c5\u51b5\uff0c\u9700\u8981\u52a01\n    }\n    while(c < 0){\n        len++;\n        c = c << 1;\n    }\n    return len;\n}\n\nstd::string substrWithChinese(std::string str,unsigned int start,unsigned int length){\n    unsigned int i = 0;             \/\/\u6807\u8bc6\u524d\u8fdb\u7684\u51e0\u4e2a\u201c\u5b57\u7b26\u201d\n    unsigned int cursor = 0;        \/\/\u6807\u8bc6\u524d\u8fdb\u4e86\u51e0\u4e2a\u201c\u5b57\u201d\n    unsigned int save = 0;          \/\/\u4fdd\u5b58\u7684\u5b57\u7b26\u6807\u8bc6\n    unsigned int len = str.length();\n    char* c = new char[len + 1];\n    while(str[i] != '\\0'&&length > 0){\n        unsigned int l = getUtf8CharLength(str[i]); \/\/\u83b7\u53d6\u5b57\u7b26\u957f\u5ea6\n        if(cursor >= start){\n            unsigned int m = l;\n            while(m--){\n                c[save++] = str[i++];\n            }\n            length--;\n        }else{\n            i+=l;\n        }\n        cursor++;\n    }\n    c[i] = '\\0';\n    return std::string(c);\n}\n<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"
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