Codejock Developer Community : Serialize CDateTimeCtrl state impossible?

Serialize CDateTimeCtrl state impossible? : Strange. Anyway, you don't...

Tue, 04 Aug 2009 03:01:12 +0000

Author: znakeeye
Subject: 14024
Posted: 04 August 2009 at 3:01am

Strange. Anyway, you don't have to assign it if it is invalid.

if ((pDTChange->dwFlags == GDT_VALID)

m_lastDate = pDTChange->st;

Strange indeed, since my date value is not changed when debugging during "unchecking"...

Serialize CDateTimeCtrl state impossible? : Sure I did before posting: void...

Mon, 03 Aug 2009 14:54:35 +0000

Author: mdoubson
Subject: 14024
Posted: 03 August 2009 at 2:54pm

Sure I did before posting:

void CMFC_DATEDlg::OnDateTimeChanged(NMHDR *pNMHDR, LRESULT *pResult){

LPNMDATETIMECHANGE pDTChange = reinterpret_cast(pNMHDR);

m_lastDate = pDTChange->st; SetWindowText(m_lastDate.Format()); *pResult = 0; }

Serialize CDateTimeCtrl state impossible? : Disagree. If you use ON_NOTIFY_REFLECT_EX()...

Mon, 03 Aug 2009 14:37:20 +0000

Author: znakeeye
Subject: 14024
Posted: 03 August 2009 at 2:37pm

Disagree.

If you use ON_NOTIFY_REFLECT_EX() in your message map, your message handler may or may not allow the parent window to handle the message. If the handler returns FALSE, the message will be handled by the parent as well, while a call that returns TRUE does not allow the parent to handle it.

And

If you want more than one object in the notification routing to handle a message, you can use ON_NOTIFY_EX (or ON_NOTIFY_EX_RANGE) rather than ON_NOTIFY (or ON_NOTIFY_RANGE).

If the user unchecks the control, m_lastDate is assigned a valid date. Just verified this.

Serialize CDateTimeCtrl state impossible? : No - this is not true - in the...

Sun, 26 Jul 2009 03:07:58 +0000

Author: mdoubson
Subject: 14024
Posted: 26 July 2009 at 3:07am

No - this is not true - in the moment user uncheck control - m_lastDate will have invalid data. Proper syntax for notification - void - you can use *pResult to pass TRUE or FALSE)

Serialize CDateTimeCtrl state impossible? : Thanks for your hints. Though,...

Sat, 25 Jul 2009 02:38:13 +0000

Author: znakeeye
Subject: 14024
Posted: 25 July 2009 at 2:38am

Thanks for your hints.

Though, I believe this is the best solution:

BOOL CDateTimeCtrlEx::OnDateTimeChanged(NMHDR *pNMHDR, LRESULT *pResult)

{

LPNMDATETIMECHANGE pDTChange = reinterpret_cast<LPNMDATETIMECHANGE>(pNMHDR);

m_lastDate = pDTChange->st;

*pResult = 0;

return FALSE; // Let the parent handle the message as well!

}

"m_lastDate" will always contain the latest selection, no matter if the checkbox was checked or not. Though, just in case, I only use this variable if GetTime() fails (which it does when unchecked). One must also be careful with calls to SetTime() since it cannot be overloaded.

Serialize CDateTimeCtrl state impossible? : OK. This is a simple way to...

Fri, 24 Jul 2009 01:29:16 +0000

Author: mdoubson
Subject: 14024
Posted: 24 July 2009 at 1:29am

OK.

This is a simple way to bypass "the coordinate of the checkbox cannot be safely determined"

for (int i = 0; i < 30; i++)

{

//LPARAM lparam = MAKELPARAM(10, 15);

LPARAM lparam = MAKELPARAM(i, 15);

m_DateTimeCtrl.SendMessage(WM_LBUTTONDOWN, NULL, lparam);

COleDateTime dt;

m_DateTimeCtrl.GetTime(dt);

if (dt.GetStatus() == COleDateTime::valid)

{

CString s; s.Format(_T("Valid with i =%d"), i);

AfxMessageBox(s);

break;

}

i = 0 - bad, 1 - good

Serialize CDateTimeCtrl state impossible? : Sorry, didn't mean it that...

Thu, 23 Jul 2009 23:04:32 +0000

Author: znakeeye
Subject: 14024
Posted: 23 July 2009 at 11:04pm

Sorry, didn't mean it that way :(

The problem is not your solution. The problem is that Microsoft implemented the control this way.

Serialize CDateTimeCtrl state impossible? : If somebody ask a question: "How...

Thu, 23 Jul 2009 15:54:49 +0000

Author: mdoubson
Subject: 14024
Posted: 23 July 2009 at 3:54pm

If somebody ask a question: "How do you set a valid time AND uncheck the control programmatically?"

and recive positive answer - last he can do in his comment - use term ugly or talk about safe way!?

Serialize CDateTimeCtrl state impossible? : mdoubson wrote:As you know...

Wed, 22 Jul 2009 16:45:38 +0000

Author: znakeeye
Subject: 14024
Posted: 22 July 2009 at 4:45pm

mdoubson wrote:

As you know CDateTimeCtrl not allow to retrieve datetime value (visible on display) if unchecked.

This is simple code to programmatically change mode without user click - after you can get value - and uncheck CDateTimeCtrl control back.

LPARAM lparam = MAKELPARAM(10, 15);

m_DateTimeCtrl.SendMessage(WM_LBUTTONDOWN, NULL, lparam);

//Of course 10 (y) and 15 (x) is coordinates for standard case - normal font. Need to adjust for some custom setup like large font

Sorry, missed that post. But still, the solution is quite ugly (not to mention that the coordinate of the checkbox cannot be safely determined).

Serialize CDateTimeCtrl state impossible? : Control will not answer you on...

Wed, 22 Jul 2009 16:45:29 +0000

Author: mdoubson
Subject: 14024
Posted: 22 July 2009 at 4:45pm

Control will not answer you on your call but still keep previously set value on it's display. I demonstarted how to get it back!