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Posted 1 Dec 1999
Licenced CPOL

Closing unused MDI documents with 1 line of code

, 1 Dec 1999
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This code closes the default "blank" document when an existing file is opened in a MFC MDI application.

This code closes the default "blank" document when an existing file is opened in a MFC MDI application (This behaviour can also be seen in Microsoft's Word and Excel).

It works for files opened from File->Open... menu option and files opened from the MRU (most-recently-used) list.

Best of all, it only requires adding one line of code to your application:

#include "CloseUnusedDocs.h"  // STEP #1: INCLUDE HEADER FILE
BOOL CYourDoc::OnOpenDocument(LPCTSTR lpszPathName) 
  if (!CDocument::OnOpenDocument(lpszPathName))
    return FALSE;        
  CCloseUnusedDocs::close_unused_documents(this); // STEP #2: INSERT THIS LINE
  return TRUE;

The algorithm for the code is : loop through all of the documents (via all of the document-templates) and close the ones that match the criteria of:

  1. NOT previously saved ( CDocument::GetPathName() is empty), AND
  2. NOT Modified ( CDocument::IsModified() is zero ) AND
  3. NOT the document we are in the process of opening (the "this" pointer in the code above)

For more information you can look at the code (it's quite short, and fairly well commented).


This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)


About the Author

Warren Stevens
Software Developer (Senior)
Canada Canada[^]
Huge list of stock icon collections (both free and commercial)

The picture is from September 2006, after picking up a rental car at the airport in Denver, Colorado. I'm smiling in the picture, because I have yet to come to the realization that I just wasted 400 bucks ( because you don't really need a car in downtown Denver - you can just walk everywhere).

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Comments and Discussions

Generalvery deceptive... Pin
yeahRight7-Aug-01 8:20
memberyeahRight7-Aug-01 8:20 
GeneralRe: very deceptive... Pin
Warren Stevens7-Aug-01 8:31
memberWarren Stevens7-Aug-01 8:31 
GeneralRe: very deceptive... Pin
Nish [BusterBoy]28-Nov-01 5:57
memberNish [BusterBoy]28-Nov-01 5:57 

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