NetNews Offline 2/NetNews Offline Volume 2.iso/news/comp/lang/c++-part2/18077

Internet Message Format | 1996-08-05 | 4.9 KB

Path: mics.demon.co.uk!Bill
From: Bill Michell <[e-mail]>
Newsgroups: comp.lang.c++
Subject: Re: MFC Appl. only containing a dialog
Date: Wed, 17 Apr 1996 13:29:36 +0100
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In article <[e-mail]>, Alex Chacha <[e-mail]>
writes
>cae2/test/pruef1 Joerg Redenius wrote:
>
>> I want to write a very simple application using my MSVC++ 1.52.
>> The application should only display a small dialog WITH help
>> feature.
>
>This is relatively easy:
>1. create an application using appwizard
>2. using appstudio create a dialog you want to use
>3. using classwizard create the class for your new dialog
>4. remove the doc template in winapp and it's usage (mostly in
>InitInstance)
>5. remove view/doc/frame files from your project
>6. delete them (so they don't clutter your sub-dir)
>7. in InitInstance find the routine (m_pMainWnd = ...)
>8. replace it with:
>  CMyDialog *dialogX = new CMyDialog;
>  m_pMainWnd = dialogX;
>
>(Don't remember if you need to call DoModal, but I think you do)
>
>9. for non modal dialogs you have to call CMyDialog::Create function,
>but this is rare...
>
>Let me know how it went.  I did this on several occasions with much
>success...
>
There are a few extra things you will need to do if you want the dialog
box to have a properly working minimise button. I got the code from a
nic man from microsoft:
From [e-mail] Wed Jan 10 17:20:14 1996

Below is the code snippet I mentioned. You need to provide
functionality for the following three functions, as well as adding the
m_hIcon member variable for
your dialog class.
The OnPaint function handles the drawing of the icon.
The OnQueryDragIcon function handles the dragging of the icon around the
screen
by the user.
The Constructor loads the icon, and passes the icon's handle into the
m_hIcon
member variable. Remember to provide an icon resource to pass to
LoadIcon!


If you have any more problems, don't hesitate to give us a call!

Regards,

Steve Smith, Microsoft Systems Developer Support.


// If you add a minimize button to your dialog, you will need the code
below
//  to draw the icon.  For MFC applications using the document/view
model,
//  this is automatically done for you by the framework.

void CDemoDlg::OnPaint()
{
        if (IsIconic()) // This member function returns TRUE if a window
                        // is iconised. Otherwise (suprisingly) it
returns FALSE.
        {
                CPaintDC dc(this); // device context for painting

                SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(),
0);
                // This message ensures the background behind where the
                // Icon is to be drawn is painted with the brush of the
parent
                // window - or repaint the desktop in that area.

                // Center icon in client rectangle
                int cxIcon = GetSystemMetrics(SM_CXICON);
                int cyIcon = GetSystemMetrics(SM_CYICON);
                // The GetSystemMetrics function returns system
information,
                // such as screen size (in pixels) and loads of other
stuff.
                // This can be a useful function - have a look at the
documentation
                // for it in the online help.

                CRect rect;
                GetClientRect(&rect);
                int x = (rect.Width() - cxIcon + 1) / 2;
                int y = (rect.Height() - cyIcon + 1) / 2;

                // Draw the icon
                dc.DrawIcon(x, y, m_hIcon);
                // Draw icon onto display context.
        }
        else
        {
                CDialog::OnPaint();
                // If you had your own OnPaint code for the dialog, you
would
                // place that here.
        }
}

// The system calls this to obtain the cursor to display while the user
drags
//  the minimized window. this is necessary if you want the user to be
able to drag the
// icon around the screen!
HCURSOR CDemoDlg::OnQueryDragIcon()
{
        return (HCURSOR) m_hIcon;
        // Tells windows to use the icon as a cursor while the user is
dragging.
}

CDemoDlg::CDemoDlg(CWnd* pParent /*=NULL*/)
        : CDialog(CDemoDlg::IDD, pParent)
{
        //{{AFX_DATA_INIT(CDemoDlg)
                // NOTE: the ClassWizard will add member initialization
here
        //}}AFX_DATA_INIT
        // Note that LoadIcon does not require a subsequent DestroyIcon
in Win32
        // But you will probably (!) need it for win16 - you would place
the destroy
        // icon in the CDemoDlg::~CDemoDlg function.

        m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME);
}



--
Bill Michell   eMail: [e-mail]