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Opening / Saving multiple types of documents in MFC MDI applications

, 24 Nov 2004
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A simple Visual C++ 6.0 multiple document (MDI) project that allows opening / saving multiple types of documents.

Introduction

This is a simple visual C++ 6.0 multiple document (MDI) project that allows opening / saving multiple types of documents. Normally, when you start an MDI project, you are allowed to associate one file type (i.e. extension) with your project. If you want to be able to open / save more that one type, you need to change your program a bit (Figure 1). MyFirstProject is a simple empty project that handles multiple types.

Sample Image - MDI_MultipleExtension.jpg

What you need to do

All the altered codes are marked (as //Babak) so you can find them easily and just implement them exactly in your own project. Here is a summary of what you need to do:

  • Derive a class from CDocManager (here named CMultDocManager)
    • Override DoPromptFileName
    • Override OnFileNew
    • You will need to copy _AfxAppendFilterSuffix (with a slight change) from mfc/src/ docmgr.cpp (bad programming style)
  • Derive a class from CMultiDocTemplate (here named CMultMultiDocTemplate)
    (this is so your program can recognize multiple file types seperated by a semicolon
    • Override GetDocString
    • Override MatchDocType

(for the last two steps, just add the files MultDocManager.h/cpp and MultMultiDocTemplate.h/cpp to your project)

  • Set m_pDocManager of your main application class (the one that is derived from CWinApp) to new CmultDocManager
  • Open the .rc file of the project and make copies of IDR_...TYPE (for various file types)
  • Go through all the projcet files and everytime IDR_...TYPE is used, also use the new ones you made
  • Override DoSave in your main document class (the one that is derived from CDocument)

References

  • “MFC Document/View documentation and enhancements” by Roger Allen on CodeProject.com
  • “How to support two file extensions per MFC document type” Micorosft support document Article ID 141921
  • “DocMgrEx.exe Assoc Multiple File Extension w/2 Doc Tyle” Micorosft support document Article ID 198538
  • “Selecting multiple files in File Open dialog” by Kaus Gutter on CodeGuru.com
  • “Opening multiple documents of several types at once” by Ernesto Perales Soto on CodeProject.com

License

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

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About the Author

BabakTaati
Toronto Rehabilitation Institute - UHN
Canada Canada
Babak Taati, Ph.D.
Scientist
AI & Robotics Research Team
Toronto Rehabilitation Institute - UHN
www.torontorehab.com/research

Comments and Discussions

 
QuestionMore than two extensions PinmemberMember 83901214-Mar-12 1:29 
GeneralSaving Pinmemberdaman37127-Nov-05 13:02 
GeneralRe: Saving Pinmemberdaman37127-Nov-05 14:54 
GeneralRight Click 'New' Menu PinsussNorrie Taylor1-Mar-05 12:27 
GeneralRe: Right Click 'New' Menu Pinmemberdaman37127-Nov-05 11:48 
Generalsome questions PinmemberSwingKid2-Dec-04 17:02 
GeneralRe: some questions PinmemberBabakTaati3-Dec-04 7:58 
Hi,
 
1)
 
The part that is commented adds an extension (e.g. .ex1 or .ex2) at the end of the 'suggested file name' when the save dialog box comes up. The problem is, when you change the file type, (from the combo box, for instance from "First1 files" to "First2 files") the extension for the suggested file name doesn't change. I couldn't figure out an elegant way of handlnig this, so I just commented the whole thing.
 
the way it is now, it suggests a file name (with no extension) and sticks the extension (ex1 or ex2, whichever you chose from teh combo box) at the end of it.
 
Any one has a better suggestion?
 
2)
 
In what I was trying to do, I had two file formats that contained the same information just written differently in file. So all I needed to do was to have a switch in my Serialize function that loaded/saved the files according to their extension. But the data structure in the document class and the visualizaton (view class) were the same. So *I* didn't need to have two different document/view classes. But I guess if the documents you are trying to load are not of the same general type (in my case, a set of 3D points), then you'll need to have seperate document/view classes for them.
 
> Or there is a variable somewhere to tell the single
> Document class what type of document has been opened
 
You can just add a flag to your document class.
 
3)
same general idea
 

GeneralRe: some questions PinmemberSwingKid4-Dec-04 10:17 
GeneralSalam PinmemberA. Riazi25-Nov-04 19:48 
GeneralRe: Salam PinmemberBruno Norberto26-Nov-04 1:17 
GeneralRe: PinmemberBabakTaati26-Nov-04 8:12 

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