C++字符编码转化代码

 bool GB2312_AnsiToUnicode(char *lpszOut, const char* lpszIn,
                          const char* lpszCurCode/* = NULL*/,
                          const char* lpszOutCode/* = NULL*/)
{
#ifdef WIN32       //  _WIN32
       //Do nothing
 int lpszOut_size=GB2312_AnsiToUnicode_Size(lpszIn);

    //这函数与操作系统相关，XP下用CP_THREAD_ACP，win2000下用CP_ACP
 MultiByteToWideChar(CP_THREAD_ACP, 0,lpszIn,strlen(lpszIn)+1,(unsigned short*)lpszOut,lpszOut_size);

#else               //  _WIN32
#ifdef HAVE_ICONV
    /* Use iconv to convert the message into utf-16.
    * \"char\" and \"\" are aliases for the local 8-bit encoding */
    iconv_t cd;
    //  ICONV_CONST char *from_str = message;
    char *from_str = (char*)lpszIn;
    char *to_str = lpszOut;
    size_t from_sz = strlen(lpszIn) + 1;
    //      size_t to_sz = from_sz*4;
    size_t to_sz = GB2312_AnsiToUnicode_Size(lpszIn);
    size_t res;
    int i;
 char lpszCodeName_From[30], lpszCodeName_To[30];
 if (lpszCurCode)
  strcpy(lpszCodeName_From, lpszCurCode);
 else
  strcpy(lpszCodeName_From, \"gb2312\");
 if (lpszOutCode)
  strcpy(lpszCodeName_To, lpszOutCode);
 else
  strcpy(lpszCodeName_To, \"UTF-16\");
#ifdef _DEBUG
 fprintf(stdout, \"Convert ’%s’ from %s to %s\\n\", lpszIn, lpszCodeName_From, lpszCodeName_To); [Page]
#endif
    //  if ((cd = iconv_open(\"unicode\", \"gb2312\")) == (iconv_t)-1) {
    if ((cd = iconv_open(lpszCodeName_To, lpszCodeName_From)) == (iconv_t)-1) {
        perror(\"Couldn’t open iconv\");
        return false;
     }
     res = iconv(cd, &from_str, &from_sz, &to_str, &to_sz);
     if (res == -1) {
  perror(\"Couldn’t use iconv\");
  return false;
     }
     iconv_close(cd);
#endif
#ifdef _DEBUG
 fprintf(stdout, \"Convert result: ’%s’\\n\", lpszOut);
#endif
#endif      //  End of _WIN32
 return true;
}
int GB2312_AnsiToUnicode_Size(const char* lpszIn)
{
    int iCounter = 0;
 for (int index = 0; lpszIn[index]; index++) {
  if( (unsigned char)lpszIn[index] > 127 )
  {
   index++;
  }
  else
  {
            ;
  }
  iCounter+=2;
 }
    iCounter += 4;
#ifdef _DEBUG
    fprintf(stdout, \"GB2312_AnsiToUnicode_Size() return %d\\n\", iCounter);
#endif
    return iCounter;
    //  return 48;
}