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CBegin dlg;
    if(dlg.DoModal()!=IDCANCEL)
    {
        OnOK();
    }


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

    // TODO: Add extra initialization here
    SetTimer(1, 2000, NULL); //1:Specifies a nonzero timeridentifier
                             //2000:Specifies the time-out value, in milliseconds.
                             //NULL:Pointer to the function...if it's NULL, the system posts a WM_TIMER message to the application queue.

    return TRUE;  // return TRUE unless you set the focus to a control
                  // EXCEPTION: OCX Property Pages should return FALSE
}

void CBegin::OnTimer(UINT nIDEvent) 
{
    // TODO: Add your message handler code here and/or call default

    KillTimer(1); //1:the timer identifier
    CDialog::OnCancel();

    CDialog::OnTimer(nIDEvent);
}

原文链接: https://www.cnblogs.com/pythonschool/archive/2012/11/14/2770025.html

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