C++ UTF-8编码与解码
求C++ UTF-8编码与解码函数？
如“大家好”<=>e5a4a7e5aeb6e5a5bd20
谢谢！
[解决办法]
http://faq.csdn.net/read/211113.html
[解决办法]
下列函数是我工程里用的。
先转换到Unicode，再到UTF-8，反之也一样。
qp::StringW Global::AnsiToUnicode(const char* buf){ int len = ::MultiByteToWideChar(CP_ACP, 0, buf, -1, NULL, 0); if (len == 0) return L""; std::vector<wchar_t> unicode(len); ::MultiByteToWideChar(CP_ACP, 0, buf, -1, &unicode[0], len); return &unicode[0];}qp::StringA Global::UnicodeToAnsi(const wchar_t* buf){ int len = ::WideCharToMultiByte(CP_ACP, 0, buf, -1, NULL, 0, NULL, NULL); if (len == 0) return ""; std::vector<char> utf8(len); ::WideCharToMultiByte(CP_ACP, 0, buf, -1, &utf8[0], len, NULL, NULL); return &utf8[0];}qp::StringW Global::Utf8ToUnicode(const char* buf){ int len = ::MultiByteToWideChar(CP_UTF8, 0, buf, -1, NULL, 0); if (len == 0) return L""; std::vector<wchar_t> unicode(len); ::MultiByteToWideChar(CP_UTF8, 0, buf, -1, &unicode[0], len); return &unicode[0];}qp::StringA Global::UnicodeToUtf8(const wchar_t* buf){ int len = ::WideCharToMultiByte(CP_UTF8, 0, buf, -1, NULL, 0, NULL, NULL); if (len == 0) return ""; std::vector<char> utf8(len); ::WideCharToMultiByte(CP_UTF8, 0, buf, -1, &utf8[0], len, NULL, NULL); return &utf8[0];}
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Up老邓
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用我的吧 标准c++的、
#include "stdafx.h"#include <string>#include <clocale>using namespace std;#include "charsetCvt.h"string ws2s(const wstring& ws){ string curLocale = setlocale(LC_ALL, NULL); // curLocale = "C"; setlocale(LC_ALL, "chs"); const wchar_t* _Source = ws.c_str(); size_t _Dsize = 2 * ws.size() + 1; char *_Dest = new char[_Dsize]; memset(_Dest,0,_Dsize); wcstombs(_Dest,_Source,_Dsize); string result = _Dest; delete []_Dest; setlocale(LC_ALL, curLocale.c_str()); return result;} wstring s2ws(const string& s){ setlocale(LC_ALL, "chs"); const char* _Source = s.c_str(); size_t _Dsize = s.size() + 1; wchar_t *_Dest = new wchar_t[_Dsize]; wmemset(_Dest, 0, _Dsize); int nret = mbstowcs(_Dest,_Source,_Dsize); wstring result = _Dest; delete []_Dest; setlocale(LC_ALL, "C"); return result;} wstring UTF2Uni(const char* src, std::wstring &t){ if (src == NULL) { return L""; } int size_s = strlen(src); int size_d = size_s + 10; //? wchar_t *des = new wchar_t[size_d]; memset(des, 0, size_d * sizeof(wchar_t)); int s = 0, d = 0; bool toomuchbyte = true; //set true to skip error prefix. while (s < size_s && d < size_d) { unsigned char c = src[s]; if ((c & 0x80) == 0) { des[d++] += src[s++]; } else if((c & 0xE0) == 0xC0) ///< 110x-xxxx 10xx-xxxx { WCHAR &wideChar = des[d++]; wideChar = (src[s + 0] & 0x3F) << 6; wideChar |= (src[s + 1] & 0x3F); s += 2; } else if((c & 0xF0) == 0xE0) ///< 1110-xxxx 10xx-xxxx 10xx-xxxx { WCHAR &wideChar = des[d++]; wideChar = (src[s + 0] & 0x1F) << 12; wideChar |= (src[s + 1] & 0x3F) << 6; wideChar |= (src[s + 2] & 0x3F); s += 3; } else if((c & 0xF8) == 0xF0) ///< 1111-0xxx 10xx-xxxx 10xx-xxxx 10xx-xxxx { WCHAR &wideChar = des[d++]; wideChar = (src[s + 0] & 0x0F) << 18; wideChar = (src[s + 1] & 0x3F) << 12; wideChar |= (src[s + 2] & 0x3F) << 6; wideChar |= (src[s + 3] & 0x3F); s += 4; } else { WCHAR &wideChar = des[d++]; ///< 1111-10xx 10xx-xxxx 10xx-xxxx 10xx-xxxx 10xx-xxxx wideChar = (src[s + 0] & 0x07) << 24; wideChar = (src[s + 1] & 0x3F) << 18; wideChar = (src[s + 2] & 0x3F) << 12; wideChar |= (src[s + 3] & 0x3F) << 6; wideChar |= (src[s + 4] & 0x3F); s += 5; } } t = des; delete[] des; des = NULL; return t;}int Uni2UTF( const wstring& strRes, char *utf8, int nMaxSize ){ if (utf8 == NULL) { return -1; } int len = 0; int size_d = nMaxSize; for (wstring::const_iterator it = strRes.begin(); it != strRes.end(); ++it) { wchar_t wchar = *it; if (wchar < 0x80) { // //length = 1; utf8[len++] = (char)wchar; } else if(wchar < 0x800) { //length = 2; if (len + 1 >= size_d) return -1; utf8[len++] = 0xc0 | ( wchar >> 6 ); utf8[len++] = 0x80 | ( wchar & 0x3f ); } else if(wchar < 0x10000 ) { //length = 3; if (len + 2 >= size_d) return -1; utf8[len++] = 0xe0 | ( wchar >> 12 ); utf8[len++] = 0x80 | ( (wchar >> 6) & 0x3f ); utf8[len++] = 0x80 | ( wchar & 0x3f ); } else if( wchar < 0x200000 ) { //length = 4; if (len + 3 >= size_d) return -1; utf8[len++] = 0xf0 | ( (int)wchar >> 18 ); utf8[len++] = 0x80 | ( (wchar >> 12) & 0x3f ); utf8[len++] = 0x80 | ( (wchar >> 6) & 0x3f ); utf8[len++] = 0x80 | ( wchar & 0x3f ); } } return len;}string s2utfs(const string& strSrc){ string strRes; wstring wstrUni = s2ws(strSrc); char* chUTF8 = new char[wstrUni.length() * 3]; memset(chUTF8,0x00,wstrUni.length() * 3); Uni2UTF(wstrUni,chUTF8, wstrUni.length() * 3); strRes = chUTF8; delete []chUTF8; return strRes;}string utfs2s(const string& strutf){ wstring wStrTmp; UTF2Uni( strutf.c_str(),wStrTmp); return ws2s(wStrTmp);}
[解决办法]
除非是网络传送、XML之类的，否则不推荐在Windows中使用本地UTF8编码，尤其不推荐中文使用UTF8
[解决办法]
转换经常要碰上的，还是学会的好。
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支持老邓! 我用他上面的函数,就实现了.
[解决办法]
unicode与utf8转换，已经测试过：
//转换后使用完毕要释放lpMultiByteStr
int wcharToUTF8(LPCWSTR lpWideCharStr,LPSTR & lpMultiByteStr,int & cchMultiByte)
{
//revert wchar string to utf8 string
cchMultiByte = WideCharToMultiByte(CP_UTF8, 0, lpWideCharStr, sizeof(WCHAR) * wcslen(lpWideCharStr), lpMultiByteStr,0,NULL,NULL);//获取转换成多字节字符串所需要的内存
lpMultiByteStr = new char[cchMultiByte + 1];
memset(lpMultiByteStr,0,cchMultiByte + 1);
WideCharToMultiByte(CP_UTF8, 0, lpWideCharStr, sizeof(WCHAR) * wcslen(lpWideCharStr), lpMultiByteStr,cchMultiByte,NULL,NULL);
return cchMultiByte;
}
//转换后使用完毕要释放lpWideCharStr
int UTF8Towchar(LPCSTR lpMultiByteStr,LPWSTR & lpWideCharStr,int & cchWideChar)
{
//revert utf8 string to wchar string
cchWideChar = MultiByteToWideChar(CP_UTF8,0,lpMultiByteStr,strlen(lpMultiByteStr),NULL,0);
lpWideCharStr = new WCHAR[cchWideChar + 1];
memset(lpWideCharStr,0,sizeof(WCHAR) * (cchWideChar + 1));
MultiByteToWideChar(CP_UTF8,0,lpMultiByteStr,strlen(lpMultiByteStr),lpWideCharStr,cchWideChar);
return cchWideChar;
}
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mark一下。
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