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With v0.8, I added the feature “don’t create the same attachment, in the same attachment folder, if it already exists.” And I added a bug. The bug would crash LNME when this happened: Find duplicate attachment file name Extract the new attachment to the %temp% directory. It would crash if the “new” attachment [...] The user reported In Lotus Notes, when I create an attachment, I click on "My Documents" shortcut, and it should take me to My Documents folder. BUT Lotus Notes is adding it as an attachment instead." Indeed it is. Fixed in Lotus Notes 6.5.1, with a setting added to the [...] Yesterday, I talked about file hashing in Visual Basic. There was a reason, and that was that I updated my Lotus Notes Mail Exporter program with some limited duplicate attachment checking. Limited because it’s simple. Simple as in: check to see if a file attachment with the same name already exists. if [...] Duplicate file detection is fairly easy to do, as it turns out, and it goes like this.
One way of doing this fingerprinting is to use a hashing algorithm, such as MD5 or SHA-1. A hashing algorithm should give you a unique fingerprint for each file. The snippet of code to do that, which I borrowed from the Visual Basic Knowledgebase is below the fold. Now there are applications, such as DiskState, which scan your hard disk for duplicates by using MD5 hashing. But they do this:
Why do I need to know how to detect duplicate files? Well I was updating the Lotus Notes Mail Exporter program the other day, and decided to implement some duplicate attachment file checking. I’m not sure if I’m that happy with how I’ve implemented it, time will tell. It does give me an idea for some other programs … (Click here to continue reading Duplicate files and hashing in Visual Basic.) |
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