Problem setting time in CDateTimePicker control in OnInitDialog

Hi all, coding MFC C++ in VS.NET 2003

I have a DateTimePicker on one of my dialogs.  I need to set the time of the control when the containing dialog is created.  

I've added a member variable for the DateTimePicker ( m_dtp )
But if I try to use it in OnInitDialog I get an error because my variable is null.
alexatsearidgeAsked:
Who is Participating?
I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

AndyAinscowFreelance programmer / ConsultantCommented:
I suspect the class wizard hasn't added entries into the DoDataExchange function of the dialog.

if m_dtp is a COleDateTime then
DDX_DateTimeCtrl(pDX, IDC_DATE_TIME_PICKER_ID_HERE, m_dtp)
else if it is a datetime picker control
DDX_Control(pDX, IDC_DATE_TIME_PICKER_ID_HERE, m_dtp)
0
alexatsearidgeAuthor Commented:
It was there: DDX_Control(pDX, IDC_DTPSTARTTIME, m_dtpStartTime);
Any other ideas?
0
AndyAinscowFreelance programmer / ConsultantCommented:
Exactly what is m_dtpStartTime (in header file)
0
Bootstrap 4: Exploring New Features

Learn how to use and navigate the new features included in Bootstrap 4, the most popular HTML, CSS, and JavaScript framework for developing responsive, mobile-first websites.

alexatsearidgeAuthor Commented:
If I don't try to set the time in OnInitDialog I have no problems.  The dialog appears with the DateTimePicker there.  I can select a time and save it.  

It's when I do the following in OnInitDialog that I get the error:
m_dtpStartTime.SetTime( myCOleDateTimeVar );

And the error is that the hWnd value for m_dtpStartTime is null.
0
alexatsearidgeAuthor Commented:
It is a CDateTimeCtrl.
0
AndyAinscowFreelance programmer / ConsultantCommented:
Post the code in the OnInitDialog and the DoDialogExchange functions please
0
alexatsearidgeAuthor Commented:
//  Header file
CDateTimeCtrl                              m_dtpStartTime;
virtual BOOL                              OnInitDialog                        ();
virtual void                                 DoDataExchange                (CDataExchange* pDX);

-------------------------------------
void CMyDlg::DoDataExchange(CDataExchange* pDX)
{
      CDialog::DoDataExchange(pDX);
      DDX_Control(pDX, IDC_DTPSTARTTIME, m_dtpStartTime);
}

BOOL CMyDlg::OnInitDialog()
{      
      m_dtpStartTime.SetTime(m_estStartTime);

      return TRUE;
}
0
AndyAinscowFreelance programmer / ConsultantCommented:
BOOL CMyDlg::OnInitDialog()
{      
CDialog::OnInitDialog();  //IMPORTANT, this calls DoDataExchange amongst other things
      m_dtpStartTime.SetTime(m_estStartTime);
0

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
alexatsearidgeAuthor Commented:
Man... today must be an off day for me.  Thanks for your patience Andy.
0
AndyAinscowFreelance programmer / ConsultantCommented:
Everyone has less than optimal days, your welcome.
0
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today
.NET Programming

From novice to tech pro — start learning today.