MFC 中的日期验证 [英] Date validation in MFC

问题描述

我有两个用于 FROM 和 TO 日期的日期时间选择器控件.我想将 TO 日期开始日期限制为 FROM 日期.

I have two date-time picker controls for FROM and TO date. I want to limit the TO date starting date to the FROM date.

示例:如果 FROM 日期是 4/12/2013TO 日期选择器应允许用户仅选择从 2013 年 4 月 12 日到当前日期的日期.

Example: If FROM date is 4/12/2013 The TO date picker should allow the user to select date only from 4/12/2013 to current date.

DoDataExchange()方法中的代码如下.

The code is as follows in DoDataExchange() method.

 DDX_Text(pDX, IDC_DATETIME_FILTER_FROM, m_daysStartDateVal);
 DDV_MinMaxDateTime(pDX, m_daysStartDateVal,&StartDate,&COleDateTime::GetCurrentTime());
 DDX_Text(pDX, IDC_DATETIME_FILTER_TO, m_daysEndDateVal);
 DDV_MinMaxDateTime(pDX,m_daysEndDateVal,&m_daysStartDateVal.GetTickCount(),&COleDateTime::GeCurrentTime());

每当我更改 FROM 日期时，它都不会反映 TO 日期选择器中的可能日期.

Whenever I change the FROM date it is not reflecting the possible dates in TO date picker.

如何将其限制为 FROM 日期的开始日期?

How can i limit it to the starting date of the FROM date?

推荐答案

对话框数据验证不是这样工作的.您只能指定一个(静态)范围，并且例程会验证您的值是否在该预定义范围内.但是，您可以使用自己的验证例程扩展此机制.

Dialog data validation does not work like that. You can only specified a (static) range, and the routine verifies that your value is within that pre-defined range. You can extended however this mechanism with your own validation routine.

下面的示例函数接受两个变量和一个范围，并确保

The example function below takes two variables and a range, and makes sure

void AFXAPI DDV_MinMaxDates(
   CDataExchange* pDX,
   COleDateTime& fromValue, COleDateTime& toValue,
   const COleDateTime* refMinRange, const COleDateTime* refMaxRange)
{
  if(fromValue > toValue ||
     fromValue < refMinRange || fromValue > refMaxRange ||
     toValue < refMinRange || toValue > refMaxRange)
  {
     AfxMessageBox(_T("Incorrect interval!"));
     pDX->Fail();
  }
}

你可以这样使用它:

DDV_MinMaxDates(pDX, m_daysStartDateVal, m_daysEndDateVal, &StartDate,&COleDateTime::GetCurrentTime());

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