Hiding an MFC dialog box

Question

Ok so I am using this code to hide the taskbar icon of a dialog based MFC application(VC++). The taskbar icon and the dialog box hide whenever I click on the cross or the close

Answer 1

If you show your dialog using CDialog::DoModal() the framework will make sure your dialog is shown. There is only one way to prevent a modal dialog from being shown:

BEGIN_MESSAGE_MAP(CMyDialog, CDialog)
    ON_WM_WINDOWPOSCHANGING()
END_MESSAGE_MAP()

BOOL CHiddenDialog::OnInitDialog()
{
    CDialog::OnInitDialog();
    m_visible = FALSE;

    return TRUE;
}

void CHiddenDialog::OnWindowPosChanging(WINDOWPOS FAR* lpwndpos) 
{
    if (!m_visible)
        lpwndpos->flags &= ~SWP_SHOWWINDOW;

    CDialog::OnWindowPosChanging(lpwndpos);
}

Answer 2

I think Paul DiLascia recommended the following. This is for modal dialogs only.

The following code can be put in OnInitDialog to move the dialog off-screen. You will need to implement a method for moving it back on-screen when appropriate.

CRect DialogRect;
GetWindowRect(&DialogRect);
int DialogWidth = DialogRect.Width();
int DialogHeight = DialogRect.Height();
MoveWindow(0-DialogWidth, 0-DialogHeight, DialogWidth, DialogHeight);

The answer from l33t looks good and is probably better but this is an alternative.

Answer 3

Maybe an obvious thing, but what happens when you do the hide before you reparent the dialog? Also what if you don't directly modify the window style but use ShowWindow(SW_HIDE)?

Finally, have you tried switching the dialog's window style to WS_CHILD before calling SetParent() and/or maybe moving it out of the client area so that the window isn't shown any more (MoveWindow(-1000, -1000) or something like that).