多字节与UTF-8、Unicode之间的转换

 // 多字节编码转为UTF8编码
 bool MBToUTF8(vector<char>& pu8, const char* pmb, int32 mLen)
 {
  // convert an MBCS string to widechar
  int32 nLen = MultiByteToWideChar(CP_ACP, 0, pmb, mLen, NULL, 0);

  WCHAR* lpszW = NULL;
  try
  {
     lpszW = new WCHAR[nLen];
  }
  catch(bad_alloc &memExp)
  {
     return false;
  }

  int32 nRtn = MultiByteToWideChar(CP_ACP, 0, pmb, mLen, lpszW, nLen);

  if(nRtn != nLen)
  {
     delete[] lpszW;
     return false;
  }
  // convert an widechar string to utf8
  int32 utf8Len = WideCharToMultiByte(CP_UTF8, 0, lpszW, nLen, NULL, 0, NULL, NULL);
  if (utf8Len <= 0)
  {
      return false;
  }
  pu8.resize(utf8Len);
  nRtn = WideCharToMultiByte(CP_UTF8, 0, lpszW, nLen, &*pu8.begin(), utf8Len, NULL, NULL);
  delete[] lpszW;

  if (nRtn != utf8Len)
  {
      pu8.clear();
      return false;
  }
  return true;
 }

 // UTF8编码转为多字节编码
 bool UTF8ToMB(vector<char>& pmb, const char* pu8, int32 utf8Len)
 {
     // convert an UTF8 string to widechar
     int32 nLen = MultiByteToWideChar(CP_UTF8, 0, pu8, utf8Len, NULL, 0);

     WCHAR* lpszW = NULL;
     try
     {
         lpszW = new WCHAR[nLen];
     }
     catch(bad_alloc &memExp)
     {
         return false;
     }

     int32 nRtn = MultiByteToWideChar(CP_UTF8, 0, pu8, utf8Len, lpszW, nLen);

     if(nRtn != nLen)
     {
         delete[] lpszW;
         return false;
     }

     // convert an widechar string to Multibyte
     int32 MBLen = WideCharToMultiByte(CP_ACP, 0, lpszW, nLen, NULL, 0, NULL, NULL);
     if (MBLen <=0)
     {
         return false;
     }
     pmb.resize(MBLen);
     nRtn = WideCharToMultiByte(CP_ACP, 0, lpszW, nLen, &*pmb.begin(), MBLen, NULL, NULL);
     delete[] lpszW;

     if(nRtn != MBLen)
     {
         pmb.clear();
         return false;
     }
     return true;
 }

 // 多字节编码转为Unicode编码
 bool MBToUnicode(vector<wchar_t>& pun, const char* pmb, int32 mLen)
 {
     // convert an MBCS string to widechar
     int32 uLen = MultiByteToWideChar(CP_ACP, 0, pmb, mLen, NULL, 0);

     if (uLen<=0)
     {
         return false;
     }
     pun.resize(uLen);

     int32 nRtn = MultiByteToWideChar(CP_ACP, 0, pmb, mLen, &*pun.begin(), uLen);

     if (nRtn != uLen)
     {
         pun.clear();
         return false;
     }
     return true;
 }

 //Unicode编码转为多字节编码
 bool UnicodeToMB(vector<char>& pmb, const wchar_t* pun, int32 uLen)
 {
     // convert an widechar string to Multibyte
     int32 MBLen = WideCharToMultiByte(CP_ACP, 0, pun, uLen, NULL, 0, NULL, NULL);
     if (MBLen <=0)
     {
         return false;
     }
     pmb.resize(MBLen);
     int nRtn = WideCharToMultiByte(CP_ACP, 0, pun, uLen, &*pmb.begin(), MBLen, NULL, NULL);

     if(nRtn != MBLen)
     {
         pmb.clear();
         return false;
     }
     return true;
 }

 // UTF8编码转为Unicode
 bool UTF8ToUnicode(vector<wchar_t>& pun, const char* pu8, int32 utf8Len)
 {
     // convert an UTF8 string to widechar
     int32 nLen = MultiByteToWideChar(CP_UTF8, 0, pu8, utf8Len, NULL, 0);
     if (nLen <=0)
     {
         return false;
     }
     pun.resize(nLen);
     int32 nRtn = MultiByteToWideChar(CP_UTF8, 0, pu8, utf8Len, &*pun.begin(), nLen);

     if(nRtn != nLen)
     {
         pun.clear();
         return false;
     }

     return true;
 }

 // Unicode编码转为UTF8
 bool UnicodeToUTF8(vector<char>& pu8, const wchar_t* pun, int32 uLen)
 {
     // convert an widechar string to utf8
     int32 utf8Len = WideCharToMultiByte(CP_UTF8, 0, pun, uLen, NULL, 0, NULL, NULL);
     if (utf8Len<=0)
     {
         return false;
     }
     pu8.resize(utf8Len);
     int32 nRtn = WideCharToMultiByte(CP_UTF8, 0, pun, uLen, &*pu8.begin(), utf8Len, NULL, NULL);

     if (nRtn != utf8Len)
     {
         pu8.clear();
         return false;
     }
     return true;
 }