Multibyte and Unicode in VS

ANSI（ namely MBCS）： For multibyte character set , It is the encoding method of indefinite length to represent the world characters .ANSI When it represents English letters, it is the same as ASCII equally , But when representing other words, you need to use multiple bytes （ When processing Chinese characters Use double byte mode ）.ANSI Character use 8bit, Can express 256 Characters , Express 26 An English letter is more than enough , But it means Chinese characters , Korean , Japanese and other non Western characters with thousands of characters are certainly not enough .

Unicode： Both English and Chinese characters are represented by double bytes . Like characters ‘A’ stay ASCII The following is represented by a byte , And in the Unicode The following is represented by two bytes , Among them, the high word section uses ‘0’ fill ; Character Chinese character “ you ” stay ASCII The following is represented by two bytes , And in the Unicode The following is also represented by two bytes .Unicode The use of fixed length is to express the world text , According to statistics , Two bytes can encode all existing words without ambiguity .

Windows NT All the character related functions of the provide versions in two ways , and Windows 9x Only support ANSI The way . If the encoding method is ANSI,_T It doesn't work ; If the encoding method is Unicode, The compiler will put " Hello ！" With Unicode How to save ._T and _L The difference is that ,_L No matter how you compile , All with Unicode Methods to save .

ANSI：windows In the system ANSI Generally refers to the localized character set and its coding method , It varies according to the system version and relevant language options
unicode Medium utf-8: One byte in English 、 Three bytes of Chinese characters ;
unicode Medium utf-16： Both English and Chinese characters are two bytes ;

Reference resources ：
1.https://blog.csdn.net/Aliven888/article/details/109708358
2.https://blog.csdn.net/qq_28437139/article/details/104199308
3.https://blog.csdn.net/SarahZhang0104/article/details/51346999
4.https://www.cnblogs.com/linkstree/p/5677883.html
5.https://www.zhihu.com/question/20650946