how to simultaneously show 2 dialogs

[Krauze]

I'm now coding with VC++2008. I wanna show 2 dialogs at the same time. So how to achieve it? Thanks in advance. In fact I've tried the following:

BOOL CDlg1::OnInitDialog()
{
...
dlg2.Create(IDD_DIALOG2, this); // where dlg2 is defined as a private CDlg2 varibale of CDlg1 in its header file
dlg2.ShowWindow(SW_SHOW);
...
}

But this doesn't work.

[transoft]

You can run two Modeless Dialog Boxes. following might help you. http://msdn.microsoft.com/en-us/library/ms644996%28VS.85%29.aspx[^]

[Luc Pattyn]

A dialog, i.e. a window shown as modal, by definition is unique within a process, as it grabs you, your mouse and keyboard until you dismiss it. If you want two dialogs, you need two processes. Or you switch to modeless windows, which aren't dialogs at all. But then other forms of the same process could also be brought to the foreground and operated on. :)

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[Stephen Hewitt]

Luc Pattyn wrote:

If you want two dialogs, you need two processes.

This isn't true. It's possible and quite common for a modal dialog to have a button (or some other mechanism) which brings up another "nested" (not nested in a parent-child sense) modal dialog. Both dialogs are modal and shown at the same time although while the nested one exists the parent one is disabled.

Steve

[Xie Jinghui]

define dlg2 as a member varibale of CDlg1.

CDlg2 * m_pDlg2;

BOOL CDlg1::OnInitDialog()
{
// ...
m_pDlg2 = new CDlg2();
m_pDlg2->Create(IDD_DIALOG2, this);
m_pDlg2->ShowWindow(SW_SHOW);
// ...
}

void CDlg1::OnDestroy()
{
CDialog::OnDestroy();

// TODO: Add your message handler code here
if(m\_pDlg2)
    delete m\_pDlg2;
m\_pDlg2 = NULL;

}

modified on Thursday, October 28, 2010 4:17 AM

[Stephen Hewitt]

Why bother using new and delete and the pointer m_pDlg2? In general I'd lose the new and delete (and in this case the OnDestroy handler too) and embed CDlg2 directly:

class CDlg1 : /* Stuff removed */
{
// ... Stuff removed ...
   CDlg2 m_Dlg2;
// ... Stuff removed ...
};
 
BOOL CDlg1::OnShowOtherDialog()
{
   // ...
   m_Dlg2.Create(IDD_DIALOG2, this);
   m_Dlg2.ShowWindow(SW_SHOW);
   // ...
}

Steve

[Luc Pattyn]

You're right of course, however that still leaves only one accessible dialog, not what the OP wants. :)

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[federico strati]

If you don't need 2 dialogs at the same time but you need them both displayable, then you're speaking about something like a tabbed dialog: each tab will show a dialog. I've a sample of doing this at the demo app that is in the article A Standard Multithreaded Dynamic Queue. Otherwise you want to investigate modeless dialogs.

[Xie Jinghui]

Good advice, en,, I prefer to use pointer..

[Stephen Hewitt]

I prefer to avoid using the heap when it's not necessary: It's faster, safer and helps minimise heap fragmentation.

Steve