// Read template<> bool OpcXml::Read(const COpcString& cString, DateTime& cValue) { bool bResult = true; FILETIME cFileTime; // check for invalid date. if (cString.IsEmpty()) { cValue = OpcMinDate(); return true; } TRY { SYSTEMTIME cSystemTime; ZeroMemory(&cSystemTime, sizeof(cSystemTime)); COpcText cText; COpcTextReader cReader(cString); // parse date fields. cText.SetType(COpcText::Delimited); cText.SetDelims(L"T"); if (!cReader.GetNext(cText)) THROW_(bResult, false); if (!ToDate(cText, cSystemTime.wYear, cSystemTime.wMonth, cSystemTime.wDay)) { THROW_(bResult, false); } // parse time fields. cText.SetType(COpcText::Delimited); cText.SetDelims(L"Z-+"); cText.SetEofDelim(); if (!cReader.GetNext(cText)) THROW_(bResult, false); bResult = ToTime( cText, cSystemTime.wHour, cSystemTime.wMinute, cSystemTime.wSecond, cSystemTime.wMilliseconds); if (!bResult) { THROW_(bResult, false); } // convert to a UTC file time. if (!SystemTimeToFileTime(&cSystemTime, &cFileTime)) { THROW_(bResult, false); } if (cText.GetDelimChar() != _T('Z')) { // convert local system time to UTC file time. if (cText.GetEof()) { FILETIME ftUtcTime; if (!OpcLocalTimeToUtcTime(cFileTime, ftUtcTime)) { THROW_(bResult, false); } cFileTime = ftUtcTime; } // apply offset specified in the datetime string. else { bool bNegative = (cText.GetDelimChar() == _T('-')); // parse time fields. cText.SetType(COpcText::Delimited); cText.SetEofDelim(); if (!cReader.GetNext(cText)) THROW_(bResult, false); SHORT sMinutes = 0; bResult = ToOffset( cText, bNegative, sMinutes); if (!bResult) { THROW_(bResult, false); } // apply timezone offset. LONGLONG llTime = OpcToInt64(cFileTime); llTime -= ((LONGLONG)sMinutes)*60*10000000; cFileTime = OpcToFILETIME(llTime); } } cValue = cFileTime; } CATCH { ZeroMemory(&cFileTime, sizeof(cFileTime)); cValue = cFileTime; } return bResult; }
// GetNext bool COpcTextReader::GetNext(COpcText& cToken) { // no more data to get - give up if (m_uEndOfData == 0) { return false; } // find the token if (!FindToken(cToken)) { return false; } // all done if token is not being extracted. if (cToken.GetNoExtract()) { return true; } UINT uEndOfToken = cToken.GetEnd() + 1; UINT uDataLeft = m_uEndOfData - uEndOfToken; // extract the delimiter if extracting token. // new line delimiter found. if (cToken.GetNewLine()) { if (cToken.GetDelimChar() == _T('\r')) { uEndOfToken += 2; uDataLeft -= 2; } else { uEndOfToken += 1; uDataLeft -= 1; } } // specific delimiter found. else if (cToken.GetDelimChar() > 0 && !cToken.GetEof()) { uEndOfToken++; uDataLeft--; } // move leftover data to the start of the buffer for (UINT ii = 0; ii < uDataLeft; ii++) { m_szBuf[ii] = m_szBuf[uEndOfToken+ii]; } m_szBuf[ii] = L'\0'; m_uEndOfData = uDataLeft; // set EOF flag if no data left in buffer. if (m_uEndOfData == 0) { cToken.SetEof(); } return true; }