Validate a CString variable

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Hi all,

I want to check if a CString variable contains only numbers and the character: "/". I used the FindOneOf function but that doesn't work.

C++

CString startDate; 
if ( startDate.FindOneOf(_T("abcdefghijklmnopqrstuvwxyz")) == true )

Is there a better way to do this? The date format is "dd/mm/yyyy"

Posted 7-Sep-12 5:03am

Sumal.V

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2 solutions

Solution 1

Are you using MFC?

This might work:

C++

CString startDate = "01/12/2012";
COleDateTime date;
if (date.ParseDateTime (startDate, VAR_DATEVALUEONLY)) 
{ 
    // Parse succeeded, so it's a valid date
}

Posted 7-Sep-12 5:14am

Steve Echols

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Sumal.V 7-Sep-12 11:36am

Yeah I use Visual C++. But this didn't work ! But hey Thanks :)

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Jochen Arndt · Accepted Answer · 2012-09-07T05:18:00

You may write a short parser that checks each character:

LPCTSTR lpszParse = strDate.GetString();
while (*lpszParse && _tcschr(lpszParse, _T("01234567890/")))
    lpszParse++;
if (*lpszParse == _T('\0') && !strDate.IsEmpty())
{
    // valid string
}

But with a fixed date format you may also parse it completely to check for a valid date:

C++

int nDay = _tstoi(strDate.GetString());
int nMonth = _tstoi(strDate.GetString() + 3);
int nYear = _tstoi(strDate.GetString() + 6);
if (strDate.GetAt(2) == _T('/') &&
    strDate.GetAt(5) == _T('/') &&
//  strDate.GetLength() == 10 &&
    nDay >= 1 && nDay <= 31 &&
    nMonth >= 1 && nMOnth <= 12)
{
// valid
}