#include <string>using std::string;using std::wstring;std::wstring GlobalMultiByteToWideChar(const char* pszMultiByte,UINT uCodePage = CP_ACP ){try{if (NULL == pszMultiByte){throw -1;}int iMultiBytes = ::MultiByteToWideChar( uCodePage, 0, pszMultiByte, -1, NULL, 0 );if (iMultiBytes == 0){throw -1;}wchar_t* pwszMultiByte = new wchar_t[ iMultiBytes + 1];pwszMultiByte[iMultiBytes] = 0;if (!pwszMultiByte){throw -1;}::MultiByteToWideChar( uCodePage, 0, pszMultiByte , -1, pwszMultiByte, iMultiBytes );std::wstring wstrWideChar = pwszMultiByte;delete [] pwszMultiByte;pwszMultiByte = NULL;return wstrWideChar.c_str();}catch (...){return L"";}}std::string GlobalWideCharToMultiByte(const wchar_t* pwszMultiByte,UINT uCodePage = CP_ACP ){try{if (NULL == pwszMultiByte){throw -1;}int iMultiBytes = ::WideCharToMultiByte( uCodePage, 0, pwszMultiByte, -1, NULL, 0 ,NULL,FALSE);if (iMultiBytes == 0){throw -1;}char* pszMultiByte = new char[ iMultiBytes + 1];pszMultiByte[iMultiBytes] = 0;if (!pszMultiByte){throw -1;}::WideCharToMultiByte( uCodePage, 0, pwszMultiByte , -1, pszMultiByte, iMultiBytes ,NULL,FALSE);std::string strMultiChar = pszMultiByte;delete [] pszMultiByte;pszMultiByte = NULL;return strMultiChar.c_str();}catch (...){return "";}}//////////////////////////////////////////////////////////////////////////enum BomFormat{BOM_ASCII,BOM_UNICODE,BOM_UNICODE_BIG_ENDIAN,BOM_UTF_8};bool SaveTxtData(std::wstring& strText,std::wstring& strPathName,BomFormat bomFormat = BOM_UNICODE){CFile File;bool res = false ;if (File.Open(strPathName.c_str(), CFile::modeCreate | CFile::modeWrite | CFile::typeBinary)){unsigned char *lpData = NULL;unsigned long ulLen = 0 ;unsigned long ulDataLen = strText.length() * 2 ;switch (bomFormat){case BOM_ASCII:{std::string strData = GlobalWideCharToMultiByte(strText.c_str());ulLen = strData.length();lpData = new unsigned char[ulLen];memcpy(lpData,strData.c_str(),ulLen);}break;case BOM_UNICODE:{ulLen = ulDataLen + 2 ;lpData = new unsigned char[ulLen];lpData[0] = 0xff;lpData[1] = 0xfe;memcpy(&lpData[2],strText.c_str(),ulDataLen);}break;case BOM_UNICODE_BIG_ENDIAN:{ulLen = ulDataLen + 2 ;lpData = new unsigned char[ulLen];lpData[0] = 0xfe;lpData[1] = 0xff;wchar_t* pd = new wchar_t[ulDataLen];memcpy(pd,strText.c_str(),ulDataLen);for (unsigned long i = 0;i < ulDataLen ;i ++){pd[i] = htons(pd[i]);}memcpy(&lpData[2],pd,ulDataLen);delete [] pd;}break;case BOM_UTF_8:{std::string strData = GlobalWideCharToMultiByte(strText.c_str(),CP_UTF8);ulLen = strData.length() + 3;lpData = new unsigned char[ulLen];lpData[0] = 0xef;lpData[1] = 0xbb;lpData[2] = 0xbf;memcpy(&lpData[3],strData.c_str(),strData.length());}break;}if (lpData){File.Write(lpData,ulLen);res = true ;}File.Close();}return res;}BomFormat GetTxtBomFormat(unsigned char* lpData,unsigned long ulLen){BomFormat bomFormat = BOM_ASCII ;if ( ulLen >= 2 ){if (lpData[0] == 0xff && lpData[1] == 0xfe) // unicode{bomFormat = BOM_UNICODE;}if (lpData[0] == 0xfe && lpData[1] == 0xff) // unicode big endian{bomFormat = BOM_UNICODE_BIG_ENDIAN; }if (ulLen >= 3){if (lpData[0] == 0xef && lpData[1] == 0xbb && lpData[2] == 0xbf) // utf-8{bomFormat = BOM_UTF_8;}}}return bomFormat;}bool OpenTxtData(std::wstring& strText,std::wstring& strPathName){CFile File;bool res = false ;if (File.Open(strPathName.c_str(), CFile::modeRead | CFile::typeBinary)){int iLength = (int)File.GetLength();unsigned char* szBuffer= new unsigned char[iLength+1];memset(szBuffer, 0, iLength+1);File.Read(szBuffer,iLength);szBuffer[iLength] = 0 ;if (iLength > 0){switch (GetTxtBomFormat(szBuffer,iLength)){case BOM_ASCII:strText = GlobalMultiByteToWideChar((const char*)&szBuffer[0],CP_ACP);break;case BOM_UNICODE:{ASSERT(!(iLength % 2));int len = iLength/2;wchar_t* buf= new wchar_t[len];memset(buf,0,iLength);memcpy(buf,&szBuffer[2],iLength-2);buf[len-1] = 0;strText = buf;delete [] buf;}break;case BOM_UNICODE_BIG_ENDIAN:{ASSERT(!(iLength % 2));int len = iLength/2;wchar_t* buf= new wchar_t[len];memset(buf,0,iLength);memcpy(buf,&szBuffer[2],iLength-2);for (int i = 0;i < len;i ++){buf[i] = htons(buf[i]);}buf[len-1] = 0;strText = buf;delete [] buf;}break;case BOM_UTF_8:strText = GlobalMultiByteToWideChar((const char*)&szBuffer[3],CP_UTF8);break;}}res = true ;delete [] szBuffer;File.Close();}return res;}
