PRB: OnInitialUpdate() May Be Called More Than Once

• The Microsoft Foundation Classes (MFC), used with:
  • Microsoft Visual C++ for Windows
  • Microsoft Visual C++ 32-bit Edition

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.

Additional query words:

Keywords : kbDocView kbMFC kbVC100 kbVC150 kbVC200 kbVC400 kbVC410 kbGrpMFCATL kbArchitecture
Version : winnt:
Platform : winnt
Issue type : kbprb