Creating an event when a file is placed in a directory 2

[damonh78]

Hi,

Has anyone any ideas on how I can solve a problem I am working on. In my application users upload files to a directory and these files are then processed by the app. I am working on a way that my application will know that a new file has been placed in the directory and can then process it. Unfortunately all the processed files have to stay in the directory as well, so I cant just use a timer and process any file that is in the directory and then move them afterwards. I suppose I could keep a list of all the files that are in directory and check every file against this each time but that would be very time consuming. I cant think of any way to know if a file is new or not.

Any ideas would be most helpful,

damonh

 

[bjd4jc]

Please see thread222-1097046. I am unable to find the original coded posted by strongm but the code that is there is his originally (as pointed out in the thread).

 

[strongm]

Sure. Try these threads with my examples of how to do this: thread222-719707 (non-blocking version) and Thread222-576673 (blocking version)

 

[damonh78]

cheers guys thanks very much thats a great help.

 

[keenanbr]

I'd like to do somethine similar on a shared drive but theses routines won't work. Any suggestions????

 

[strongm]

>theses routines won't work

Erm ... they work against network drives on my corporate network - but they have to have been mapped ...

 

[keenanbr]

My drives are also mapped but I always get an error 'Invalid handle -1) when i call FindFirstChangeNotification(...). It works fine on my local drives.

 

[strongm]

Erm ... my code, as illustrated in the linked threads, doesn't use FindFirstChangeNotification ...

 

[keenanbr]

Sorry strongm, got confused between your app and mine. Mine returns -1 (from the above function), yours just stays in an infinite loop and doesn't notice any changes. The file system is NWFS.

Regards,

 

[strongm]

Well, all I can say is that it works fine here (and I've even tested the asynchronous version against a drive mapped over a WAN VPN). Be careful, though, my example code is an illustration of the technique rather than a full solution, and only provides feedback to the user if

a) a file is added to the folder we are watching AND
b) the file is called "test.txt"

so you'd need to modify it for your own purposes