A dialog box is a window that pops up in response to user action to inform the user with a message. E.g. if the user does not save the document and exists the application the window pops up asking if he wants to save the document. This window is the dialog box. Modal Dialog: A modal dialog box disables the window to which it is assigned until the user dismisses the dialog box. E.g. The dialog that gets displayed with "yes"/"no"/"cancel" when you try to exit MS Word without saving the document is a modal dialog box. A model dialog box is created by calling the doModal() function of the dialog class. This function does not return back control to the caller until the dialog is dismissed. E.g. CDialog dlg; dlg.doModal(); Modeless Dialog: A modeless dialog box is just the reverse of modal. It allows the user complete control of the application which owns it and the user can continue his work without closing the dialog. A modeless dialog box can be created using the Create () command of CDialog class. The Create() call returns as soon as the dialog box is created. Hence the control returns back to the caller and the user is able to continue using the application.
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Property sheets are tabbed dialog boxes containing pages that the user can switch with mouse clicks. They are a part of common library of windows just like dialog and other controls. E.g. when a user adds a schedules task it walks him through a wizard which is nothing but a property sheet. The functionality of property sheets is encapsulated in MFC classes of CPropertySheet and CPropertyPage. CPropertyPage represents a page in a property sheet and is a subclass of CDialog. Like dialog boxes property sheets can be modal or modeless. Use CPropertySheet::DoModal for modal and CPropertySheet::Create for a modeless property sheet. There are four broad steps in creating a property page: 1. For each property page create a dialog template. 2. For the created dialog associate a class that derives from CPropertyPage. 3. Derive a property sheet class from CPropertySheet and create an object for each above created property pages. 4. Add the property page objects to the created property sheet using AddPage. 5. Call the doModal function of the property sheet to display it on the screen.
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The first dialog workprocess acts as a dispatcher and starts the other relevant workprocesses. hence, out of the minimum two dialog workprocess one acts as a dispatcher and other one is to meet the user logon.
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