验证一个CString变量 [英] Validate a CString variable

问题描述

大家好，

我想检查CString变量是否仅包含数字和字符:"/".我使用了FindOneOf函数，但是不起作用.

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.

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

有一个更好的方法吗?日期格式为"dd/mm/yyyy"

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

推荐答案

您可以编写一个简短的解析器来检查每个字符:

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
}

但是使用固定的日期格式，您也可以将其完全解析以检查有效日期:

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

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
}

您使用的是MFC吗?

这可能有效:

Are you using MFC?

This might work:

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

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