[C/C ++] _ [Unicode (char *) to UTF8]

1. here is only the conversion of a single unicode character. to convert a string, you need to traverse the entire string. You can use the append of std: string to add it. 2. for unicode with a 2-byte width, you only need unicode_char_length = 2. 3. if you have any questions, please point out. [cpp] void OneUnicode2UTF8 (const char * unicode_char, size_t unicode_char_length, char * utf_char) {// unicode: 0x192-> 110010010, utf8: 0xC692-> 1100011010010010 int value = 0; memcpy (& value, unicode_char, unicode_char_length); if (value> = 0x0000 & value <= 0x007F) {utf_char [0] = unicode_char [0];} else if (value> = 0x0080 & value <= 0x07FF) {utf_char [0] = (value> 6) | 0xC0 ); utf_char [1] = (value & 0x3F) | 0x80);} else if (value> = 0x0800 & value <= 0 xFFFF) {utf_char [0] = (value> 12) | 0xE0); utf_char [1] = (value> 6 & 0x3F) | 0x80 ); utf_char [2] = (value & 0x3F) | 0x80);} www.2cto.com else if (value >=0x10000 & value <= 0x10FFFF) {utf_char [0] = (value> 18 | 0xF0); utf_char [1] = (value> 12 & 0x3F) | 0x80 ); utf_char [2] = (value> 6 & 0x3F) | 0x80); utf_char [3] = (value & 0x3F) | 0x80 );} else {cerr <"value too big. "<endl; assert (0 );}}