Re: Pointer to my dialog

From:

=?Utf-8?B?WWFlbA==?= <Yael@discussions.microsoft.com>

Newsgroups:

microsoft.public.vc.mfc

Date:

Sun, 27 May 2007 02:35:02 -0700

Message-ID:

<B1284DE5-1C00-42DB-B833-6F1E99CCCF5B@microsoft.com>

I'm OK, it's working to me now:
int nResponse;
//CListViewDlg * pDlg; // as memmber of this class
if ( pDlg )
{
    // Restore the dialog
    pDlg->ShowWindow( SW_SHOW );

//these lines not working to me.. how can I set focuse to this dialog?
//pDlg->SetFocus();
       //if(!pDlg->IsWindowVisible())
             // pDlg->ShowWindow(SW_SHOW);
        // if(pDlg->IsMinimized(pDlg->m_hWnd))
          // pDlg->ShowWindow(SW_RESTORE);
}
else
{
      pDlg = new CListViewDlg();
     nResponse = pDlg->DoModal();
}

CString str;
str.Format("%d",nResponse);

// Handle the return value from DoModal
switch ( nResponse )
{
case IDOK:// yes btn
{
    OnRun();
    pDlg = NULL;
    break;
}
default:
{
    pDlg = NULL;
                break;
}
};

"Joseph M. Newcomer" wrote:

Let's look at the problem...
On Fri, 25 May 2007 23:58:00 -0700, Yael <Yael@discussions.microsoft.com> wrote:

Hi,
I have my dialog inherit CDialod.
in the app I'm calling this dialog:
MyDialog dlg;
dlg.DoModal();

****
This says "Create a new instance of the dialog and show it".
****

I have a problem:
if I minimized my dialog(or not),and calling to this method agein..I get new
dialog and I still have the prev dialog (in minimized..)

*****
Well, mostly because that is exactly what you told it to do. This leads to some questions
such as "how do you get another modal dialog to come up if you already have a modal dialog
minimized"? As in previous discussions of this problem it seems that you would be MUCH
better off with a modeless dialog instead of a modal dialog
*****

for example:
in the start I call: OnStart() --> CreateDlg()
In the taskbar I have an Icon, right click --> I get menu, there I have
option to check now..for showing a dialog.
then I call to OnCheckNow() (from menu options) --> CreateDlg()
now I have 2 dialogs
CreateDlg()
{
CMyDlg dlg() ;
int nResponse = dlg.DoModal();
}

****
Having created the modal dialog, how is it possible to have the menu items active?
Invoking a modal dialog means that the main application window is disabled. You are
obviously missing showing us a lot of critical code here.

I presume your function is not called "CreateDlg" but is more likely written as
void CMyMainWindow::CreateDlg()
if it is not, that could be a lot of your problem right there.
*****

OnStart()
{
CreateDlg();
}

OnCheckNow()
{
CreateDlg();
}

****
And again, this is probably
void CMyMainWindow::OnCheckNow()
which again leads to the question of how it is possible to do ANYTHING from your main
window once the modal dialog is running. Please explain
*****

I only want one dialog, have the creating functions check to see if it has
already been created; store it in a pointer or something.

****
This is why we keep telling you that you want a MODELESS dialog. Forget DoModal exists
for this purpose. You would write
    CMyDlg * MyDlg;
as a member variable. In your constructor you would do
    MyDlg = NULL;

when you want to create the dialog you would do
    MyDlg = new CMyDlg;
    MyDlg->Create(CMyDlg::IDD);

now, in the OnCheckNow handler you would write

void CMyMainWindow::OnCheckNow()
    {
     if(MyDlg == NULL)
         { /* create it */
          MyDlg = new CMyDlg;
          MyDlg->Create(CmyDlg::IDD);
         } /* create it */
    else
        { /* already exists */
         if(!MyDlg->IsWindowVisible())
              MyDlg->ShowWindow(SW_SHOW);
         if(MyDlg->IsMinimized())
              MyDlg->ShowWindow(SW_RESTORE);
        } /* already exists */

In CMyDlg you will add the following handlers
    void CMyDlg::OnOK()
        {
        }
    void CMyDlg::OnCancel()
       {
       }
    void CMyDlg::OnClose()
       {
         DestroyWindow();
       }
    void CMyDlg::OnDestroy()
      {
        GetParent()->SendMessage(UWM_DIALOG_WENT_BYE_BYE);
                    DestroyWindow();
                  }

In your main window (or the window that launched it) you will add
    LRESULT CMyMainWindow::OnDialogWentByeBye(WPARAM, LPARAM)
         {
                       MyDlg = NULL;
                       return 0;
                     }

and to the message map you will add
    ON_REGISTERED_MESSAGE(UWM_DIALOG_WENT_BYE_BYE, OnDialogWentByeBye)

See my essay on message management on my MVP Tips site to see about registered window
messages.

This should solve your problems.
*****

I need to:
Add a member pointer to that class (app).

*****
You would more likely add it to the main window class, not to the app class, because you
need someone to handle the close notification you send
]******

When I create the dialog, set the pointer,
when I close the dialog, clear the pointer.

*****
See above code as to how to do this
*****

1) what is the difference between
myDialog &dlg
and
myDialog dlg

*****
The first is a reference and consequently requires an initialization.
The second is an instance of the dialog object
But you want *dlg, which is a pointer
*****

2) I don't find how to ask if the dlg already running.

::CreateDialog()
{
     if (dlg already running)
    {
         //???
    }
   else
   {
       dlg.DoModel();
   }

****
See above code, and remember, A MODAL DIALOG IS THE WRONG SOLUTION TO THIS PROBLEM!
****

}

Thanking you in anticipation!!!
Yael.

Joseph M. Newcomer [MVP]
email: newcomer@flounder.com
Web: http://www.flounder.com
MVP Tips: http://www.flounder.com/mvp_tips.htm