filechange c++

[susuke]

Hi!

I want to catch the changes of a file (time or size) in c++, but not with timer, i want to start a code automatically when the file is changed. Is there any possibilities for this in c++?

 

[PerFnurt]

Sure thing.

Check out the documentation in MSDN regarding FindFirstChangeNotification


/Per
[sub]Nerdy signatures are as lame as the inconsistent stardates of STTNG.[/sub]

 

[susuke]

OK, but if i use this then i need a timer, what run this command cyclic, don't i? But i don't want to use timer. I imagine this like this:

the file changes -> an event activate -> run code.

I want that the code run when the file changes, but i don't want to check it from the program with timer...

(sorry, if you can't understand what i want to say, but my english is not so good...)

 

[PerFnurt]

Did you check out the documentation I mentioned? I guess not, since there is nothing with timers there...
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Basic idea:
1)
You call FindFirstChangeNotification with some parameters/filters.

2)
Then you wait for the notifications to arrive, using WaitForSingleObject or WaitForMultipleObjects (if you for example want to listen changes in more than one directory).
You could put this in a while loop to keep on listening.
----------------------------------
Since your code will stand and wait it will "hang" your application.
Solution: Put the above mentioned stuff in a separate thread...

I reapeat, check out the articles in MSDN regarding FindFirstChangeNotification


/Per
[sub]Nerdy signatures are as lame as the inconsistent stardates of STTNG.[/sub]

 

[JOLESEN]

You need to wrap your code into a service which is always 'up and running' - ready to receive the notification(s).

/JOlesen

 

[susuke]

Ok, i see. Thanx