CDialogImpl

CDialogImpl is a class template in the Microsoft Foundation Class (MFC) library that provides a base implementation for dialog boxes. It is part of the ATL Server project but can also be used in standard MFC applications. CDialogImpl simplifies the creation and management of dialog boxes by handling common tasks such as message dispatching, control manipulation, and dialog box initialization and termination.

To use CDialogImpl, you typically derive your dialog class from it and specify the dialog template resource ID as a template parameter. The class provides a virtual function, DoModal, which displays the dialog box modally. It also handles the processing of Windows messages sent to the dialog, such as button clicks or text input. You can implement message handlers using the message map mechanism, similar to other MFC window classes.

CDialogImpl offers flexibility in how you create dialogs. It supports both modeless and modal dialogs. For modeless dialogs, you would use Create instead of DoModal. The class automatically manages the window handle and interaction with the underlying Windows dialog procedure. It is a more lightweight alternative to the standard MFC CDialog class, often preferred in scenarios where a full CDialog object might be considered overkill or when working within the ATL Server framework. It abstracts away much of the boilerplate code required for basic dialog box functionality.