INFO: OnInitialUpdate() May Be Called More Than Once

ID: Q103982

• The Microsoft Foundation Classes (MFC), included with:

      - Microsoft Visual C++ for Windows, versions 1.0, 1.5, 1.51, 1.52
      - Microsoft Visual C++ 32-bit Edition, versions 1.0, 2.0, 2.1, 4.0,
        4.1
  

SUMMARY

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          : kbDocView kbMFC kbVC 
Version           : 1.0 1.5 1.51 1.52 2.0
Platform          : NT WINDOWS

Last Reviewed: October 11, 1997