Displaying dialog box

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3.00/5 (1 vote)

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Can I use-

C++

CDialog *dlg;
dlg->DoModal();

to display dialog box?

Posted 28-Jan-13 0:29am

virus131

Updated 28-Jan-13 0:35am

Jochen Arndt

v2

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Jochen Arndt · Accepted Answer · 2013-01-28T00:34:00

Solution 1

You can't use it that way (your program will crash). You may use it this way:

C++

// Allocate CDialog object on the heap.
// Object must be destroyed when no longer needed.
CDialog *pDlg = new CDialog;
pDlg->DoModal();
delete pDlg;

// Allocate CDialog object on the stack.
// Object is destroyed when going out of scope.
CDialog dlg;
dlg.DoModal();

Posted 28-Jan-13 0:34am

Jochen Arndt

Comments

virus131 28-Jan-13 6:44am

Ok...... Thank you very much for your reply....
I want to know one more thing, can I use-
CDilaog *pDlg;
pDlg->Create();

Jochen Arndt 28-Jan-13 6:57am

No. When using 'CDialog *dlg', you create a pointer to a CDialog object but not the object itself. When using the new operator from my first example, the pointer is initialized with a newly created instance of a CDialog object.

The Create() function does not create the CDialog object, but the dialog so that it can be shown on the screen.

virus131 28-Jan-13 7:03am

ok.......... thanks a lot......

H.Brydon 30-Jan-13 2:12am

+5 ... close to what I would have said.