Saving files as type in a zip file

This is probably more simple than I think it is, but I'm having trouble reading files back correctly (outside the program) after I've programmatically made the zip file.
I'm trying to zip up selected contents of a database by getting the item, and then writing the contents of the database entry out to the zip file through a byte stream. This all works fine, but all the entries in the zip file are "files" with no extension, so they don't open properly, if at all. Is there a way to save file types correctly in a zip file based on content? The database doesn't preserve filenames, all items are referred to by unique ID's. Any help is much appreciated.

cotton.m wrote:
nsop07 wrote:
cotton.m wrote:
nsop07 wrote:
This is probably more simple than I think it is, but I'm having trouble reading files back correctly (outside the program) after I've programmatically made the zip file.
I'm trying to zip up selected contents of a database by getting the item, and then writing the contents of the database entry out to the zip file through a byte stream. This all works fine, but all the entries in the zip file are "files" with no extension, so they don't open properly, if at all. Is there a way to save file types correctly in a zip file based on content? The database doesn't preserve filenames, all items are referred to by unique ID's. Any help is much appreciated.The bottom line is that your question has nothing to do with zipping at all. You have files and they aren't saved with an extension. I would suggest you get that changed so that when you pull the data from the BLOB filed you can give it a unique name and sensible extension.
That will solve your problem.
The zipping is an extra step but totally irrelevent here.Thanks for the response.
I understand what you're saying, but I can't change the way the information is being stored or pulled from the database, I'm going to be honest with you here this is a big mistake. Fixing what meta data is available about the file in the database is the proper solution here. The person who originally made the database design made a serious error in not accounting for this information.
There is no simple way to do this. You'll have to actually look at the content of the file and determine as best you can what type of file it is. There are some third party libraries that do this sort of thing like http://sourceforge.net/projects/jmimemagic/
But depending on how many types of data this could get ugly in a hurryThat is the OPEN question here though ... how many type of data. If more than say, one, you're so right. But if it's all the same stuff, than there sould be no pblm.

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