When creating a new document in response to a New or Open command from the File menu, the document template also creates a new frame window through which to view the document.

The document-template constructor specifies what types of documents, windows, and views the template will be able to create. This is determined by the arguments you pass to the document-template constructor. The following code illustrates creation of a CMultiDocTemplate for a sample application:

[!code-cppNVC_MFCDocView#7]

The pointer to a new CMultiDocTemplate object is used as an argument to AddDocTemplate. Arguments to the CMultiDocTemplate constructor include the resource ID associated with the document type's menus and accelerators, and three uses of the RUNTIME_CLASS macro. RUNTIME_CLASS returns the CRuntimeClass object for the C++ class named as its argument. The three CRuntimeClass objects passed to the document-template constructor supply the information needed to create new objects of the specified classes during the document creation process. The example shows creation of a document template that creates CScribDoc objects with CScribView objects attached. The views are framed by standard MDI child frame windows.

Document Templates and the Document/View Creation Process
Document/View Creation
Relationships Among MFC Objects
Creating New Documents, Windows, and Views