Data exchange in VC++/MFC

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C++

MFC

VisualC++

Hello guys,

In MFC, I understand using updateData() function, which in turn calls DoDataExchange, controls variables of a dialog can be set or get.

We can also set or get values of control variables using SetDlgItemText() and GetDLGItemText() method.

What is the difference between above two??


I think in using SetDlgItemText() and GetDLGItemText() method, we can set ot get value at runtime. we do not need member string variable.



Below is the small example.

suppose I have a check box control.

a) using DDX, I would write code like this to get or set data.Based on the argument of update data, it would decide whether value had to be set ot get.

void CMyDlg::DoDataExchange(CDataExchange* pDX)

{

    DDX_Text(pDX, IDC_MINEVENTLENGTH, m_iMinEventLength);

}

b)I can also set or get value of control like below.

GetDlgItemText(hWnd, IDC_MINEVENTLENGTH, MinEventLength, _countof(MinEventLength));
SetDlgItemText(hWndDlg, IDC_MINEVENTLENGTH, MinEventLength);

Please help.

Regards,
Joy