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Watching a folder for file population

Posted on 2004-08-17
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Last Modified: 2010-05-02
Hello all, I have a rather tricky VB problem I have not been able to solve so far.
I need to write a function that will "watch" an error folder for file population.  If a file jumps into the error folder, I need to perform a series of operations (i.e. copy to another directory, rename, strip extension, ect. ) on the said file and delete it from the error folder in the end.  The problem with this is the file that appears in the error folder is not always the same name.  depending on the nature of the error, a range of different files can potentially appear.  In addition, it is possible for more than one file to populate in this location at a time, it is not uncommon to have seven or more such files appear at once.  I need some sort of way to constantly scan the folder to detect for errors even though my operations will only handle one at a time.

I tried doing this with a simple timer control but am having difficutly opening a folder and scanning for files without having the exact name.  Any suggestions?
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Question by:gwosgood
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6 Comments
 
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Expert Comment

by:vinnyd79
ID: 11822297
Maybe this example can help:

http://www.thescarms.com/vbasic/FolderSpy.asp
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Expert Comment

by:Steve Sirica
ID: 11822816
That looks pretty cool.  I think I'll download that for future use.  Thanks!
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unknown_routine earned 500 total points
ID: 11822826
Hi


You can achieve this using FilesySystemObject


Add a reference to "microsoft scripting runtime"  to your project

then use this sample code:

Private Sub Form_Load()

    Dim fs As New FileSystemObject
   
    Dim fo As Folder
   
    Set fo = fs.GetFolder("C:\Myfloder")    '<===Change this to the specific folder name
   
    Dim Fi As File
   
    For Each Fi In fo.Files
   
         MsgBox " Name=" & Fi.Name & " " & vbCrLf & "Date created=" & Fi.DateCreated
   
    Next

End Sub



In the above code Fi(file object) has a lots ofother useful properties whcih you can use them.


More questions, please  Ask,


Regards.
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LVL 4

Expert Comment

by:Steve Sirica
ID: 11822889
It's also alot easier now in VB.Net seeing that MS now sends a canned filewatch control along with.
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Author Comment

by:gwosgood
ID: 11823375
Comment for "unknown_routine"  your solution appears to be very handy.  My only question is how to use.  Would I just tie it into a timer routine and check for files once every X seconds?
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Expert Comment

by:unknown_routine
ID: 11823443
Exactly,

As far as your timer interval is bigger that 100 (1 tenth of a second)

it is healthy( usage of CPU is negligible).




Regards.
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