General Discussion - MFC DDV_MinMaxFloat does not work

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MFC DDV_MinMaxFloat does not work

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URL: http://forum.codejock.com/forum_posts.asp?TID=13538
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Topic: MFC DDV_MinMaxFloat does not work

Posted By: devam
Subject: MFC DDV_MinMaxFloat does not work
Date Posted: 02 March 2009 at 1:21am

There is an edit box in the dialog which can take only floating point numbers
To achieve following  Dialog Data Validation of MFC is used
DDV_MinMaxFloat

UpdateData(TRUE) will validate the values entered and and error message box is popped up automatically by the MFC Framework

This is working fine in following scenarios:
1. When the Edit box is empty
2. Edit box has strings : For eg: Hello

But it is not working if a string starts with a numerical value. For eg: 12Hello

In this case Hello is truncated and only the value 12 is used for validation.
This is not our requirement we need to pop up an error message box in this case as well.

My Do DataExchange function looks something like this:

void MDSWDMOTNInterfaceDlg::DoDataExchange(CDataExchange* pDX)

{

CDialog::DoDataExchange(pDX);

//{{AFX_DATA_MAP(MDSWDMOTNInterfaceDlg::DoDat)

DDX_Control(pDX, IDC_EDIT_TIME_COST, m_EditTimeCost);

DDX_Control(pDX, IDC_EDIT_TIME_WAVE, m_EditTimeWave);

DDX_Text(pDX, IDC_EDIT_TIME_COST, m_fTimeCost);

DDX_Text(pDX, IDC_EDIT_TIME_WAVE, m_fTimeWave);

DDV_MinMaxFloat(pDX,m_fTimeCost,(float)0,(float)MAX_FLOAT);

DDV_MinMaxFloat(pDX,m_fTimeWave,(float)0,(float)MAX_FLOAT);

DDX_Control(pDX, IDC_CUSTOM_CHECK, m_CheckCustomOptions);

DDX_Control(pDX, IDC_RADIO_COST, m_RadioCostOptimiz);

DDX_Control(pDX, IDC_RADIO_WAVE, m_RadioCostWaveOptimiz);

DDX_Control(pDX, IDC_EDIT_OPERINFO, m_OutputEdit);

DDX_Text(pDX, IDC_EDIT_OPERINFO, m_strOpraInfo);

DDX_Control(pDX, IDC_BUTTON_PLAN, m_PlanButton);

//}}AFX_DATA_MAP

}

Please let me know what is the reason for this and how to resolve it without writing our own code for validations.

Note:
1. This code is written in Microsoft Visual Studio 2005
2. If the same code is written in MS VC6 then MFC framework automatcally handles all scenarios and it working fine.

-------------
DC

Replies:

Posted By: Oleg
Date Posted: 02 March 2009 at 7:37am

Hi,

guess you need create own DDX_Text for such edit. See original one and change it.

-------------
Oleg, Support Team
CODEJOCK SOFTWARE SOLUTIONS

Posted By: devam
Date Posted: 02 March 2009 at 7:46am

Hi Oleg,

Thanks for the response. But I have already mentioned in the problem description that I want to know why this is happening, and if there is any solution available without having to code for validation ourselves.

-------------
DC

Posted By: devam
Date Posted: 03 March 2009 at 12:03am

Hi Oleg,

One more doubt. In your reply, you mentioned that we need to create our own DDX_Text for such an edit. But DDX_Text is not used for validation purposes, it is used to bind the control to a member variable. Did you mean that we implement our own DDV_MaxMinFloat?

How can we write our own DDX_Text to match our requirement of validating a string beginning with digits?

-------------
DC

Posted By: Oleg
Date Posted: 03 March 2009 at 12:59am

Hi,

DDX_Text in 2005 parse "12Hello" as 12 so its reason that DDV_MaxMinFloat validate value right.

So most easy way is to copy DDX_Text for float value from VC6 to your code and rename it to DDX_TextFloat.

-------------
Oleg, Support Team
CODEJOCK SOFTWARE SOLUTIONS