String hash to define unique filenames

Hi!
I'm writing a program and need to cache some resulting binary files for my users. The binary filenames would change depending on the settings the user selects (so that the process of the unique settings are saved and later retrieved by the program).
I tried to use an md5 hash from some VIs used to generate the hash from a file to try and accomplish this. The problem I had was that I found that subtle setting changes (switching a boolean from TRUE to FALSE, for instance) wouldn't generate a unique md5 result. Something about the algorithm was only considering certain parts of my input string.
I started to dig through the code, but am not very experienced on md5 hashes.
In order to generate the hash i flatten and manipulate into strings all my controls that define the settings (for instance, an array of file names along with some boolean options on how to process the set of file names). Then I concatenate all these strings together and supply this as input to my MD5 VI which spits out something like: acd3245h21543s that i add a .bin to the end of and use as a file name. When the same string is supplied (i.e., the exact same settings are selected) the program sees that the binary "cached" file with the results already exists and uses that. This doesn't work if I don't get unique strings for the file name, which is what I'm struggling with.
Thanks for all your input!

Nickerbocker wrote:
I tried to use an md5 hash from some VIs used to generate the hash from a file to try and accomplish this. The problem I had was that I found that subtle setting changes (switching a boolean from TRUE to FALSE, for instance) wouldn't generate a unique md5 result. Something about the algorithm was only considering certain parts of my input string.
Where does your MD5 VI come from? It's not the one shipped with LabVIEW or the OpenG solution. MD5 is not super strong like SHA-1 (or greater), but the string changing by the amount you mention should definitly trigger a new MD5 hash.
Ton
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createTempFile
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Hi,
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[will work for kudos]
Attachments:
Unique File Name.vi ‏34 KB

I took your suggestions
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enjoy
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Unique File Name.vi ‏35 KB
Unique File Name_8-5.vi ‏44 KB
Unique File Name8-6.vi ‏35 KB

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This will do what you want:
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String hash to define unique filenames

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