Converting a CString date key into a long key - mfc

Question

I have this problem.
This is how I create a key from a date:
CString strKey = psEvent->datEvent.Format(_T("%Y-%m-%d"));
More recently, I created a new type of key:
WORD wKey = static_cast<WORD>(CInPlaceDT::GetLongDate(psEvent->datEvent));
The GetLongDate method is:
long CInPlaceDT::GetLongDate(COleDateTime timDate)
{
long lDate;
lDate = (timDate.GetYear() * 10000) +
(timDate.GetMonth() * 100 ) +
timDate.GetDay();
return lDate;
}
There is nothing wrong with the above code. But I am now in a situation where I need to take a CString that contains a formatted key (date) and build the same long date. At the moment I am doing this:
if (mapSSEventLocations.GetSize() > 0 && m_mapWOSpecialEvents.GetSize() > 0 )
{
// The new SRR format does not use the mapSSEventLocations object anymore.
// So we must migrate what we can across.
POSITION sPos = mapSSEventLocations.GetStartPosition();
while (sPos != nullptr)
{
CString strDate, strLocation;
mapSSEventLocations.GetNextAssoc(sPos, strDate, strLocation);
// We must now find the match
// The key is like this: psEvent->datEvent.Format(_T("%Y-%m-%d"));
POSITION sPos2 = m_mapWOSpecialEvents.GetStartPosition();
while (sPos2 != nullptr)
{
WORD wDate;
CSpecialEvent *pEvent = nullptr;
m_mapWOSpecialEvents.GetNextAssoc(sPos2, wDate, (CObject *&)pEvent);
if (pEvent != nullptr)
{
COleDateTime datEvent;
CInPlaceDT::GetOleDateTime(wDate, datEvent);
CString strThisKey = datEvent.Format(_T("%Y-%m-%d"));
if (strThisKey == strDate)
{
// We got the match
pEvent->SetLocation(strLocation);
break;
}
}
}
}
}
It works fine. But I would like to take strDate and convert it to a wDate style key so I can just lookup the event.

Answer 1

I had some old code that converted text to a date using scanf, and added a second version using regex. I seem to recall an MFC regular expression class but can't find it.
CString FormatDate(COleDateTime const& dateTime)
{
// YYYY-MM-DD
return dateTime.Format(_T("%Y-%m-%d"));
}
long ToLongDate(COleDateTime const& dateTime)
{
return ((dateTime.GetYear() * 10000) +
(dateTime.GetMonth() * 100) +
dateTime.GetDay());
}
// the scanf way
long ToLongDate(CString const& dateText)
{
int year = 0;
int month = 0;
int day = 0;
if (_stscanf_s(dateText, _T("%d-%d-%d"), &year, &month, &day) != 3)
{
// invalid date - throw something?
}
COleDateTime dateTime{ year, month, day, 0, 0, 0 };
//if (dateTime.GetStatus() == COleDateTime::DateTimeStatus::invalid)
// invalid date - throw something?
return ToLongDate(dateTime);
}
// The std::regex way - #include <regex>
long ToLongDate2(CString const& dateText)
{
int year = 0;
int month = 0;
int day = 0;
try
{
std::basic_regex<TCHAR> regularExpression(
_T("^([0-9]{4})-([0-9]{2})-([0-9]{2})$"));
std::match_results<LPCTSTR> match;
if (std::regex_search(dateText.GetString(), match,
regularExpression) && (match.size() == 4))
{
// [0] - is the entire string
year = stoi(match[1].str());
month = stoi(match[2].str());
day = stoi(match[3].str());
}
}
catch (std::exception& e)
{
// Do something with exception
}
COleDateTime dateTime{ year, month, day, 0, 0, 0 };
//if (dateTime.GetStatus() == COleDateTime::DateTimeStatus::invalid)
return ToLongDate(dateTime);
}