UTF8转换宏和转换类

UTF8转换宏、转换类，使用方法和ATL的T2W W2T  CA2W，CW2A类似

 

 

/* filename: utf8.h summary: convert between LPTSTR and UTF8 string v1.0 lichiyang 2008.03 usage: // sample code USES_CONVERSION; //defined in atlconv.h LPCTSTR lpszSomeText = TEXT("我的CA"); LPSTR putf8 = T2UTF8(lpszSomeText); v2.0 lichiyang 2010.12 增加CW2UTF8/CUTF82W 2个类，用法同CW2A和CA2W CW2UTF8 utf8(L"中国的英文是China"); CUTF82W w("\xe4\xb8\xad\xe5\x9b\xbd\xe7\x9a\x84\xe8\x8b\xb1\xe6\x96\x87\xe6\x98\xaf\x43\x68\x69\x6e\x61"); // */ #ifndef _UTF8_CONVERT_H_ #define _UTF8_CONVERT_H_ #include #define W2UTF8(lpw) (\ ((_lpw = lpw) == NULL) ? NULL : (\ _convert = (lstrlenW(_lpw)+1)*3,\ ATLW2AHELPER((LPSTR) alloca(_convert), _lpw, _convert, CP_UTF8))) #define UTF82W(lpu) (\ ((_lpa = lpu) == NULL) ? NULL : (\ _convert = (lstrlenA(_lpa)+1),\ ATLA2WHELPER((LPWSTR) alloca(_convert*2), _lpa, _convert, CP_UTF8))) #define A2UTF8(lpa) W2UTF8(A2W(lpa)) #define UTF82A(lpu) W2T(UTF82W(lpu)) #if defined (UNICODE) || defined (_UNICODE) #define T2UTF8 W2UTF8 #define UTF82T UTF82W #else #define T2UTF8 A2UTF8 #define UTF82T UTF82A #endif template< int t_nBufferLength = 128 > class CUTF82WEX { public: CUTF82WEX( LPCSTR psz ) throw(...) : m_psz( m_szBuffer ) { Init( psz, CP_UTF8 ); } CUTF82WEX( LPCSTR psz, UINT nCodePage ) throw(...) : m_psz( m_szBuffer ) { Init( psz, nCodePage ); } ~CUTF82WEX() throw() { if( m_psz != m_szBuffer ) { free( m_psz ); } } operator LPWSTR() const throw() { return( m_psz ); } private: void Init( LPCSTR psz, UINT nCodePage ) throw(...) { if (psz == NULL) { m_psz = NULL; return; } int nLengthA = lstrlenA( psz )+1; int nLengthW = nLengthA; if( nLengthW > t_nBufferLength ) { m_psz = static_cast< LPWSTR >( malloc( nLengthW*sizeof( wchar_t ) ) ); if (m_psz == NULL) { AtlThrow( E_OUTOFMEMORY ); } } if (::MultiByteToWideChar( nCodePage, 0, psz, nLengthA, m_psz, nLengthW ) == 0) { AtlThrowLastWin32(); } } public: LPWSTR m_psz; wchar_t m_szBuffer[t_nBufferLength]; private: CUTF82WEX( const CUTF82WEX& ) throw(); CUTF82WEX& operator=( const CUTF82WEX& ) throw(); }; typedef CUTF82WEX<> CUTF82W; template< int t_nBufferLength = 128 > class CW2UTF8EX { public: CW2UTF8EX( LPCWSTR psz ) throw(...) : m_psz( m_szBuffer ) { Init( psz, CP_UTF8 ); } CW2UTF8EX( LPCWSTR psz, UINT nCodePage ) throw(...) : m_psz( m_szBuffer ) { Init( psz, nCodePage ); } ~CW2UTF8EX() throw() { if( m_psz != m_szBuffer ) { free( m_psz ); } } operator LPSTR() const throw() { return( m_psz ); } private: void Init( LPCWSTR psz, UINT nCodePage ) throw(...) { if (psz == NULL) { m_psz = NULL; return; } int nLengthW = lstrlenW( psz )+1; int nLengthA = nLengthW*3; if( nLengthA > t_nBufferLength ) { m_psz = static_cast< LPSTR >( malloc( nLengthA*sizeof( char ) ) ); if (m_psz == NULL) { AtlThrow( E_OUTOFMEMORY ); } } if (::WideCharToMultiByte( nCodePage, 0, psz, nLengthW, m_psz, nLengthA, NULL, NULL ) == 0) { AtlThrowLastWin32(); } } public: LPSTR m_psz; char m_szBuffer[t_nBufferLength]; private: CW2UTF8EX( const CW2UTF8EX& ) throw(); CW2UTF8EX& operator=( const CW2UTF8EX& ) throw(); }; typedef CW2UTF8EX<> CW2UTF8; #endif //_UTF8_CONVERT_H_