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特搜集了UTF-8,UNICODE,Gb2312他们3个之间的相互转换.
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: M. g. n* m; F, u9 X8 v7 OUTF-8: 3字节一个字符9 m! W0 J1 {" Z# m6 I0 x
UNICODE: 2字节一个字符
$ z) b" t: H# N# ~( @) G; L' N2 gGB2312: 1字节一个字符6 w1 L1 b5 c+ Y& z+ [+ Z) f
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例子:
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& M6 x' G' y; b0 G1 N“你”字的UTF-8编码: E4 BD A0 11100100 10111101 10100000
$ {0 i) O, k0 v) W+ O“你”的Unicode编码: 4F 60 01001111 011000008 t& m2 r. d0 G* X$ e! b) W
按照UTF-8的编码规则,分解如下:xxxx0100 xx111101 xx100000. O) F* b9 R, _& g) k3 t' ] u
把除了x之外的数字拼接在一起,就变成“你”的Unicode编码了。
* s; f- g, z; W注意UTF-8的最前面3个1,表示整个UTF-8串是由3个字节构成的。
. g, U- g5 `9 H3 s: {7 y+ f9 Q1 K0 q经过UTF-8编码之后,再也不会出现敏感字符了,因为最高位始终为1。
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7 @& x0 }8 Y. R, ~+ P% ^: ]' t+ f类定义
" L& [! b% u2 @/ }- |- class CChineseCode+ v6 B; k' f9 N. @% o$ U( J2 `
- {
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- static void UTF_8ToUnicode(wchar_t* pOut,char *pText); // 把UTF-8转换成Unicode2 l4 V, n; z' G; T% ] m% S# Q
- static void UnicodeToUTF_8(char* pOut,wchar_t* pText); //Unicode 转换成UTF-8
# }( x, C0 N& M. G - static void UnicodeToGB2312(char* pOut,wchar_t uData); // 把Unicode 转换成 GB2312
2 W5 j1 P2 e! F. }( | - static void Gb2312ToUnicode(wchar_t* pOut,char *gbBuffer);// GB2312 转换成 Unicode
8 Z' j, p2 Z+ o+ J$ n/ f0 p - static void GB2312ToUTF_8(string& pOut,char *pText, int pLen);//GB2312 转为 UTF-8$ R. J% }& u1 z
- static void UTF_8ToGB2312(string &pOut, char *pText, int pLen);//UTF-8 转为 GB23121 b5 E0 R! I4 C
- };
复制代码 类实现
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- void CChineseCode::UTF_8ToUnicode(wchar_t* pOut,char *pText)( E& e- U, l1 B& k" c' Y0 C6 t: W+ K
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- char* uchar = (char *)pOut;
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- {( n! _: ?5 ] L; z- uchar[1] = ((pText[0] & 0x0F) << 4) + ((pText[1] >> 2) & 0x0F);5 x& e# n" f; D% ?( F
- uchar[0] = ((pText[1] & 0x03) << 6) + (pText[2] & 0x3F);
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- return;
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3 { e: j# @5 p* m- void CChineseCode::UnicodeToUTF_8(char* pOut,wchar_t* pText)
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( p8 _; N$ P) q: ~& k - // 注意 WCHAR高低字的顺序,低字节在前,高字节在后
* g0 D0 W' n3 @' Y+ S - char* pchar = (char *)pText;" D. [' J( X& D) u
. z! j2 v! \+ l5 I- pOut[0] = (0xE0 | ((pchar[1] & 0xF0) >> 4));
0 V4 p9 n: H* \$ e% Z - pOut[1] = (0x80 | ((pchar[1] & 0x0F) << 2)) + ((pchar[0] & 0xC0) >> 6);
. _9 a0 G: f' r% ^* n8 Z6 R - pOut[2] = (0x80 | (pchar[0] & 0x3F));) f( y/ @' Z) p, p: I0 K7 f9 `
3 k# k% }9 H7 n b i: g0 ^- return;
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- void CChineseCode::UnicodeToGB2312(char* pOut,wchar_t uData)/ z; u4 g5 d! K! K
- {
. z5 b' L8 O8 q: c" U, d - WideCharToMultiByte(CP_ACP,NULL,&uData,1,pOut,sizeof(wchar_t),NULL,NULL);
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- void CChineseCode::Gb2312ToUnicode(wchar_t* pOut,char *gbBuffer)
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- ::MultiByteToWideChar(CP_ACP,MB_PRECOMPOSED,gbBuffer,2,pOut,1);# h9 E0 R, I8 f- W0 x
- return ;
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- void CChineseCode::GB2312ToUTF_8(string& pOut,char *pText, int pLen), k* [. t8 n# d$ N
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- char buf[4];
* U. P3 R1 M J6 G* Y6 j - int nLength = pLen* 3;! B6 D C" }7 Q0 L! t1 H
- char* rst = new char[nLength];
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- memset(buf,0,4);# n+ e/ V, t, v1 T, P0 I5 s. r% U
- memset(rst,0,nLength);
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- int i = 0;
. D/ O/ J, _3 {2 c" S9 [6 }( ?& h - int j = 0;
5 U3 e. k6 Z' M! \ - while(i < pLen)" q6 p9 L# o5 N8 a
- {
, `; m2 k/ K" l" T( p1 @ - //如果是英文直接复制就可以
2 W3 C6 ~# a/ g2 ]' o" q$ \* A - if( *(pText + i) >= 0)
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- rst[j++] = pText[i++];. g& D4 v+ l$ ?& m; W& \
- }
6 E! U: s S p - else
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4 e0 T8 C, N- i1 @- w - wchar_t pbuffer;
: G( E# W" C+ f! N/ H! }% | - Gb2312ToUnicode(&pbuffer,pText+i);; H9 g n1 g: g
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" O2 e+ g; d# w: }2 F' \ - UnicodeToUTF_8(buf,&pbuffer);
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: x! U3 V, M, q# x - unsigned short int tmp = 0;
1 [: O. D* i: K8 e+ e - tmp = rst[j] = buf[0];
+ \5 Y9 y$ l! _' B% j, z" d - tmp = rst[j+1] = buf[1];
" x% O0 z7 T9 {/ a. c2 v" X$ S; e - tmp = rst[j+2] = buf[2]; + G) R+ o* S; ]6 r* O1 l3 T2 J
-
& {4 J6 l# X6 r: B: K - j += 3;! }4 c/ E! r( S7 N& K" l
- i += 2;6 u! l7 }6 E% l' e. ?3 j6 ^( ?
- }
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- rst[j] = '\0';! V* Y- }5 w+ U9 i
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- //返回结果7 m$ V5 C( s9 e) {+ b j
- pOut = rst;
% d: y2 X* Z; t+ P! i - delete []rst;
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& @5 E! Y* ?, g& c' F% E7 h - return;; a0 i3 H! Y3 l4 w5 \
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- void CChineseCode::UTF_8ToGB2312(string &pOut, char *pText, int pLen)+ l4 R4 k) A2 e6 [) q$ M
- {
" v3 K8 C( R2 t( B, _. `; L - char * newBuf = new char[pLen];( C, P3 N P8 e. ^
- char Ctemp[4];9 F% a3 E5 K4 N# M$ c: b
- memset(Ctemp,0,4);
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- int i =0;$ t6 {6 X( F9 @ \- {: ]1 p9 b
- int j = 0;
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, n5 P" R3 O9 y9 ?, D - while(i < pLen)
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- if(pText[i] > 0)
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- newBuf[j++] = pText[i++];
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- else 9 b! a0 c8 T. [0 i$ n
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- WCHAR Wtemp;; b( @* Z% g; }- b- n2 w5 a
- UTF_8ToUnicode(&Wtemp,pText + i);/ W5 {# K1 N) ^% r6 r& S2 R2 b
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4 o' d1 O8 K; }$ q+ x' e. y( z - UnicodeToGB2312(Ctemp,Wtemp);& Y' K3 U8 i7 S. c
-
% O% @+ z, U. j - newBuf[j] = Ctemp[0];6 w X, c0 D3 O7 H9 L& W% h
- newBuf[j + 1] = Ctemp[1];
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G7 g" L* E9 C2 l- X/ l9 I' a, m- i += 3; 6 g1 N) f7 m0 ]* w9 y& ?$ O3 w
- j += 2;
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- }
p: t: |: x) G8 Z - newBuf[j] = '\0';7 f# ~- B. i$ J( L
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- pOut = newBuf;
0 l" L, G% L7 E( }' g0 L - delete []newBuf;
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- return; ( E& o* B1 y9 _9 A2 D/ v6 p$ }
- }
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