DOC:CDocTemplate::CreateNewFrame() Won't Make New CDocument

 Last reviewed: July 10, 1997
Article ID: Q121321
1.00 1.50 1.51 | 1.00 2.00 
WINDOWS        | WINDOWS NT
kbprg kbdocerr kbdocfix

The information in this article applies to:

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

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

SUMMARY

The Help File documentation for CDocTemplate::CreateNewFrame() says: 

   If the pDoc parameter is NULL, a new document will be created
   if the appropriate runtime class is available; otherwise the
   new view will be associated with the ...
This is not correct. Calling CreateNewFrame() with a NULL pDoc parameter actually results in an assertion failure on the pDoc pointer and a TRACE() statement in your output or debug window stating the following: 

   ASSERT_VALID fails with NULL pointer.
The reason for this is that CreateNewFrame() is not the appropriate function to call when you don't have a pre-constructed CDocument-derived object. The function to call is CMultiDocTemplate's or CSingleDocTemplate's OpenDocumentFile(). The OpenDocumentFile() function creates a new CDocument object by using CreateNewDocument().

MORE INFORMATION

CMultiDocTemplate:: and CSingleDocTemplate::OpenDocumentFile() both create a new document if the pointer argument passed to them is NULL. To get a pointer to the appropriate document template that you can use when calling OpenDocumentFile(), please see the following article in the Microsoft Knowledge Base: 

   ARTICLE-ID: Q106455
   TITLE     : Acquiring a List of All CDocument Objects
This article contains sample code you can use to traverse the list of available document templates.

This problem was fixed in Microsoft Visual C++, 32-bit Edition, version 4.0.

KBCategory: kbprg kbdocerr kbdocfix
KBSubCategory: MfcUI
Additional reference words: pDoc ASSERT_VALID OpenDocumentFile 1.00 1.50
2.00 2.10 2.50 2.51 3.00 4.00
Keywords : kbdocerr kbdocfix kbprg
Technology : kbMfc
Version : 1.00 1.50 1.51 | 1.00 2.00
Platform : NT WINDOWS

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Last reviewed: July 10, 1997
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