Couldn't open first dialog from second dialog in a single project (VC++)

Question

Hai all,
  Good Day. I am very new to Visual C++. I am learning VC++ and doing practice side by side using IDE - Visual Studio 2005. In my project i created two dialogs. In
first dialog  BARCODE_DIALOG (CBarCodeDlg) if i clicked  a button "password", i want to open a
second Dialog DIALOG2(CPasswordDlg).  in this if i clicked main button  DIALOG2 closed at same time i want to open first Dialog and have to do changes in first dialog. 
my problem is i closed the second dialogv by calling OnOK(). but i couldn't open first dialog. How to do?
//For opening second dialog from first dialog:
//CBarCodeDlg.cpp
void CBarCodeDlg::OnBnClickedBpswd()
// TODO: Add your control notification handler code here
OnOK();
m_dPswdDlg.DoModal(); // added variable public CPasswordDlg m_dPswdDlg
//For close second dialog and do changes in first dialog
//CPasswordDlg.cpp
void CPasswordDlg::OnBnClickedBmain()
OnOK();
m_dBarCodeDlg.DoModal(); //added varible public CBarCodeDlg m_dBarCodeDlg
if i added this 
m_dBarCodeDlg.DoModal(); //added varible public CBarCodeDlg m_dBarCodeDlg
getting errors.  How to call it and also i have to do changes in BarcodeDlg if clicked main button. can you plese help me to do it.

Answer 1

yes david. Thanks a lot david.  i got it. but what i am doing in second dialog, i getting a string and comparing with another string. if equal then enabling another button "main". if i clicked main i want enable product number combo box
in first dialog. how to enable it.
You are thinking wrong about the second dialog. It should not be trying to control the first dialog. What it should do is set some internal state that the first dialog can interrogate after DoModal() returns. The simplest (bur not best OOP practice) is to
use a public member variable, say a bool m_bSame. Then you could do
//CBarCodeDlg.cpp
void CBarCodeDlg::OnBnClickedBpswd()
CPasswordDlg dlg;
if( (dlg.DoModal() == IDOK) && dlg.m_bSame)
// enable Combo box
else
// report some kind of error
Or, even simpler, you could only allow the second dialog to return IDOK if the two strings are the same. Then you would not need the bool variable.
Or you could put the user-entered string in a public member variable and do the test in the first dialog. Then you could create the entire second dialog in the designer, without adding any code (just add a public CString variable that is bound to an edit
control).
Modal dialogs are usually just information gatherers. They should bot be reaching out into the rest of the application.
David Wilkinson | Visual C++ MVP