CFileDialog does not handle long extensions

Posted on 1998-06-08
Last Modified: 2013-11-19
I would like to save files with extensions longer than three chars,  This is done by MFC with serialization.
When using CFileDialog (or for that matter the GetSaveFileName() API) extensions are limited to three chars due to the OPENFILENAME struct. What's up with that? (dont answer)
It is possible to use the SaveAs dialog and then append my own extension, but then I wont get the benefit of OFN_OVERWRITEPROMPT.
Any solutions?

Question by:reichj
LVL 23

Expert Comment

ID: 1316251
It is not limited to three chars. Do you use the flag OFN_EXPLORER or OFN_LONGNAMES?

Author Comment

ID: 1316252

I have tried both of those proir to posting the question.  Do you have a test app with CFileDialog or GetSaveFileName() working with long extensions? Maybe I'm doing something wrong but I've been through the OPENFILENAME doc's and aggree that OFN_LONGNAMES should produce the desired result, but it doesnt.
The doc's do say this about lpstrDefExt : "append this extension to the filename if the user fails to type an extension. This string can be any length, but only the first three characters are appended".
If you have a code snipet which works please post it.


Expert Comment

ID: 1316253
What function do you use to get the filename from CFileDialog... GetPathName() ?

Do you call GetFileExt() to get the extension?
Free Tool: Port Scanner

Check which ports are open to the outside world. Helps make sure that your firewall rules are working as intended.

One of a set of tools we are providing to everyone as a way of saying thank you for being a part of the community.

LVL 11

Accepted Solution

mikeblas earned 150 total points
ID: 1316254
Actually, it's a bug in Win95. Longer extensions aren't supported by the box.  I think the problem was fixed in OSR2 of Win95.

B ekiM

Author Comment

ID: 1316255

Is this bug documented? Is there an MSDN Q# or search keyword to find it?

So I guess to use >3 char extenstions I have to

(b) append my own extension to the pathname, and
(c) Do my own overwrite protection (and dialog). Of course if the user doesnt want to overwrite I have to bring up the CFileDialog again to allow another filename selection.


Just overwrite without telling the user,  which generally does not go over very well.


LVL 11

Expert Comment

ID: 1316256
I don't know if it is documented; I don't think it is.

B ekiM

Featured Post

Free Tool: Site Down Detector

Helpful to verify reports of your own downtime, or to double check a downed website you are trying to access.

One of a set of tools we are providing to everyone as a way of saying thank you for being a part of the community.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Introduction: Dynamic window placements and drawing on a form, simple usage of windows registry as a storage place for information. Continuing from the first article about sudoku.  There we have designed the application and put a lot of user int…
Introduction: Ownerdraw of the grid button.  A singleton class implentation and usage. Continuing from the fifth article about sudoku.   Open the project in visual studio. Go to the class view – CGridButton should be visible as a class.  R…
This video will show you how to get GIT to work in Eclipse.   It will walk you through how to install the EGit plugin in eclipse and how to checkout an existing repository.
In an interesting question ( here at Experts Exchange, a member asked how to split a single image into multiple images. The primary usage for this is to place many photographs on a flatbed scanner…

790 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question