Viewing a locked log file....

[McNubblet]

Hey All,

I'm currently trying to get a little VB.Net app running that has a
FileWatcher watching a log file being generated by the PortReporter
utility.

The filewatcher has no problem notifying of a change in file size,
however, i'm trying to read the changed text from the file and operate
on it.

The problem arises when i try to open the file, it doesn't matter what
i do, it always returns "An unhandled exception of type
'System.IO.IOException' occurred in mscorlib.dll".

I have tried all manner of opening the file and always seem to get the
error:

EG's:

Dim fiLogFile As New FileInfo(txtLogFileName.Text)
Dim fs As FileStream

fsFile = fiFile.OpenRead() <-- Errors on this line

FileOpen(1, txtLogFileName.Text, OpenMode.Binary)

Dim fs As New FileStream(txtLogFileName.Text, FileMode.Open,
FileAccess.Read)

The kicker is that i have no problems opening and viewing the file in
notepad and another editor called editplus.

Anyone happen to know a way to view a locked text file in vb.net?

Not being able to work out notepad's dirty little secret is driving me
nuts!

Thanks for any help you can give me

Matt

[jmcilhinney]

If your code is in the FSW's event handler, are you sure it's not just that the previous operation hasn't actually finished with the file yet? Try putting a Sleep delay before trying to open the file. If that works then you know that that is the issue and you can look for a more permanent solution to that.

[McNubblet]

Thanks for the suggestion.

I just tried isolating the file open code in it's own procedure and disabling the watcher completely (put the open code inside a button click event).

Same result......