PRB: OnInitialUpdate() May Be Called More Than Once
Article ID: 103982
Article Last Modified on 11/21/2006
APPLIES TO
- Microsoft Foundation Class Library 4.2, when used with:
- Microsoft Visual C++ 6.0 Professional Edition
- Microsoft Visual C++ 6.0 Enterprise Edition
- Microsoft Visual C++ 5.0 Learning Edition
This article was previously published under Q103982
SYMPTOMS
The OnInitialUpdate() function of a CView object in a single document
interface (SDI) application may be called more than once. Any
initialization that needs to be done only when the view's window is
created should be done in the OnCreate() message handler instead of in
the OnInitialUpdate() function.
MORE INFORMATION
In an SDI application, a single CView object is created to display a
view of the document. When the user changes the document, the data in
the CDocument is cleared using CDocument::DeleteContents(), and data
for the new document is read into the CDocument object. Then the view
is updated by sending a WM_INITIALUPDATE message to the view's window,
which calls the OnInitialUpdate() function. Therefore, every time the
user changes documents, the OnInitialUpdate() function for the view is
called.
Keywords: kbarchitecture kbdocview kbprb KB103982