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Setting acceptable file drops to an application

Posted on 1997-10-28
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Last Modified: 2013-11-20
I want to set my application to accept only files having a particular extension by drag and drop. I have to use CWnd's 'DragAcceptFiles'in the InitInstance. Prior to calling this function, I have to set this filter that my application would reject files of any other extension, except the one I specified. I want this functionality to be in the application class, and not to be handled by various views. how to go about doing this?
Thanks.
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Question by:pcasxd0
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Tommy Hui earned 200 total points
ID: 1308988
By calling DragAcceptFiles(), you are telling Windows that the window is a drop target. It does not tell Windows which files are acceptable and which aren't. In fact, there isn't an easy way to do this. If the UI feedback isn't important, you can skip over the files you don't want.
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by:pcasxd0
ID: 1308989
How can I 'skip'over the files I don't want?
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Expert Comment

by:Tommy Hui
ID: 1308990
When you are processing the WM_DROPFILES message, it is up to you to go through all the files by using DragQueryFile and DragFinish(). The DragQueryFile returns the filename. If the filename is not what you want, then don't do anything with it.
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Author Comment

by:pcasxd0
ID: 1308991
One last doubt... can the application class handle the WM-DROPFILES command, or do I have to write an independent function like it? (I want to handle this in the app class, rather than the view classes)
Thanks..
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by:Tommy Hui
ID: 1308992
I don't think the application class can handle it. Although you can simulate that by having the view class call a member function in the application.
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Author Comment

by:pcasxd0
ID: 1308993
Thank you for the convincing answer. I'll do that.
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