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Best regards!

Are you talking about a dialog based application?  If so, how will you get
the Modal dialog back?  That's really none of my business, so here's how I'd
do it in a Dialog base app:

Create a USER message and call it using PostMessage in the dialog's
OnInitDialog function.  Then in the message handler, hide the window...  You
have to "post" the message so that the dialog initializes before it is
hidden.  If not, it will just be redisplayed when it finishes
initializing...  The code will look as follows:

In the Header of the Dialog Class:

 // Generated message map functions
 //{{AFX_MSG(CMyTestDlg)
 virtual BOOL OnInitDialog();
 afx_msg void OnPaint();
 afx_msg HCURSOR OnQueryDragIcon();
 //}}AFX_MSG
    afx_msg void OnHideWindow();  // ADD THIS LINE
 DECLARE_MESSAGE_MAP()

In the CPP File:

BEGIN_MESSAGE_MAP(CMyTestDlg, CDialog)
 //{{AFX_MSG_MAP(CMyTestDlg)
 ON_WM_PAINT()
 ON_WM_QUERYDRAGICON()
 //}}AFX_MSG_MAP
    ON_MESSAGE(WM_USER+1, OnHideWindow)  // ADD THIS LINE
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////
/////////////////////////////////////////////////////////////////////

 BOOL CMyTestDlg::OnInitDialog()
{
 CDialog::OnInitDialog();

 // Set the icon for this dialog.  The framework does this automatically
 //  when the application's main window is not a dialog
 SetIcon(m_hIcon, TRUE);   // Set big icon
 SetIcon(m_hIcon, FALSE);  // Set small icon

 // TODO: Add extra initialization here
    PostMessage(WM_USER+1);   // ADD THIS LINE

 return TRUE;  // return TRUE  unless you set the focus to a control

/////////////////////////////////////////////////////////////////////
/////////////////////////////////////////////////////////////////////
// ADD THIS METHOD
void CMyTestDlg::OnHideWindow()
{
    ShowWindow(SW_HIDE);

Hope this helps and good luck,
Chris

Heheh. So you want to start a modal dialog hidden, eh?
Take a look at the article below :-

http://www.codeproject.com/dialog/dlgboxtricks.asp

It has a section titled "Starting a modal dialog hidden"

Regards,
Nish

Thanks alot.

See here:

www.mooremvp.freeserve.co.uk/Win32/framed_tip026.htm

--
Bob Moore [WinSDK MVP]
http://www.mooremvp.freeserve.co.uk/
(this is a non-commercial site and does not accept advertising)
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Thanks alot, I've solved the problem.

I Create the Dialog myself instead of DoModal. And add a message loop after
dialog created.

CPP Codes:
////////////////////////////////////////////////////////////////////////////
////

BOOL CMyApp::InitInstance()
{
    ......
    m_pMainWnd = new CMyDlg;

    MSG msg;
    while (GetMessage(&msg, 0, 0, 0)) {
        TranslateMessage(&msg);
        DispatchMessage(&msg);
    }

    ......