OPEN A FILE FOR READ ONLY

[Morten Fagermoen]

I want to open the current IIS log file in read-only mode. This file is held
by IIS but I still can open it in Notepad, but I have not been able (so far)
to read from it using my VB.NET program.

I have tried:
Dim fileReader As StreamReader
Try
fileReader = My.Computer.Fil eSystem.OpenTex tFileReader(arg uments(1) &
"\ex" & LogDate & ".log")
Catch ex As .....

And this throws an exception when the file is already in use by IIS.

What can I do to make this work?

Regards

Morten Fagermoen

[Chris Dunaway]

Re: OPEN A FILE FOR READ ONLY

Morten Fagermoen wrote:

I want to open the current IIS log file in read-only mode. This file is held
by IIS but I still can open it in Notepad, but I have not been able (so far)
to read from it using my VB.NET program.
>
I have tried:
Dim fileReader As StreamReader
Try
fileReader = My.Computer.Fil eSystem.OpenTex tFileReader(arg uments(1) &
"\ex" & LogDate & ".log")
Catch ex As .....
>
And this throws an exception when the file is already in use by IIS.
>
What can I do to make this work?

You need to use a method that allows you to set the FileSharing mode.
Try a FileStream in connunction with a StreamReader:

Dim fs As New FileStream("c:\ test\filename.e xt", FileMode.Open,
FileAccess.Read , FileShare.ReadW rite)

Dim sr As New StreamReader(fs )

'Use the stream reader here

sr.Close()

fs.Close()


Hope this helps

[Morten Fagermoen]

Re: OPEN A FILE FOR READ ONLY

Thank you, Chris!

This tip made my day!!

Morten


"Chris Dunaway" <dunawayc@gmail .comwrote in message
news:1160747141 .130126.233160@ b28g2000cwb.goo glegroups.com.. .

Morten Fagermoen wrote:

>I want to open the current IIS log file in read-only mode. This file is
>held
>by IIS but I still can open it in Notepad, but I have not been able (so
>far)
>to read from it using my VB.NET program.
>>
>I have tried:
>Dim fileReader As StreamReader
>Try
> fileReader = My.Computer.Fil eSystem.OpenTex tFileReader(arg uments(1) &
>"\ex" & LogDate & ".log")
>Catch ex As .....
>>
>And this throws an exception when the file is already in use by IIS.
>>
>What can I do to make this work?

>
You need to use a method that allows you to set the FileSharing mode.
Try a FileStream in connunction with a StreamReader:
>
Dim fs As New FileStream("c:\ test\filename.e xt", FileMode.Open,
FileAccess.Read , FileShare.ReadW rite)
>
Dim sr As New StreamReader(fs )
>
'Use the stream reader here
>
sr.Close()
>
fs.Close()
>
>
Hope this helps
>

[Herfried K. Wagner [MVP]]

Re: OPEN A FILE FOR READ ONLY

"Morten Fagermoen" <morten@fagermo en.comschrieb:

This tip made my day!!

Little explanation: The parameter of 'FileShare' does not specify which
rights your application requires but instead it specifies which rights other
applications are granted after your application opens the file. That's why
'FileShare.Read Write' is the specified value.

--
M S Herfried K. Wagner
M V P <URL:http://dotnet.mvps.org/>
V B <URL:http://dotnet.mvps.org/dotnet/faqs/>