What would i use to look for changes in a file every minute?
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Re: Looking for contents in a file every minute
http://msdn.microsoft.com/en-us/libr...emwatcher.aspx
FileSystemWatch er Class
"Andy B" <a_borka@sbcglo bal.netwrote in message
news:%238ulBQoJ JHA.4600@TK2MSF TNGP06.phx.gbl. ..What would i use to look for changes in a file every minute?
> -
Re: Looking for contents in a file every minute
Hello Andy ,
If you want an event driven aproach go for the file system watcher as this
can give you an event when a change took place in a file
so also when there are 2 changes within a minute you get 2 change events .
Ofcourse you could also just use a timer , read the file in a string
variabel and compare the 2 strings if the 2 strings are not the same the
file has changed
however this wil cost you more CPU / IO cycles
Use the filesystem watcher to get notified when a change on the file took
place , and then reread / process the file
http://msdn.microsoft.com/en-us/libr...emwatcher.aspx
in the link i provided ( also in your previous post ) there is example code
included
in case you missed it
Public Class Watcher
Public Shared Sub Main()
Run()
End Sub
<PermissionSet( SecurityAction. Demand, Name:="FullTrus t")_
Private Shared Sub Run
Dim args() As String = System.Environm ent.GetCommandL ineArgs()
' If a directory is not specified, exit the program.
If args.Length <2 Then
' Display the proper way to call the program.
Console.WriteLi ne("Usage: Watcher.exe (directory)")
Return
End If
' Create a new FileSystemWatch er and set its properties.
Dim watcher As New FileSystemWatch er()
watcher.Path = args(1)
' Watch for changes in LastAccess and LastWrite times, and
' the renaming of files or directories.
watcher.NotifyF ilter = (NotifyFilters. LastAccess Or
NotifyFilters.L astWrite Or NotifyFilters.F ileName Or
NotifyFilters.D irectoryName)
' Only watch text files.
watcher.Filter = "*.txt"
' Add event handlers.
AddHandler watcher.Changed , AddressOf OnChanged
AddHandler watcher.Created , AddressOf OnChanged
AddHandler watcher.Deleted , AddressOf OnChanged
AddHandler watcher.Renamed , AddressOf OnRenamed
' Begin watching.
watcher.EnableR aisingEvents = True
' Wait for the user to quit the program.
Console.WriteLi ne("Press 'q' to quit the sample.")
While Chr(Console.Rea d()) <"q"c
End While
End Sub
' Define the event handlers.
Private Shared Sub OnChanged(sourc e As Object, e As FileSystemEvent Args)
' Specify what is done when a file is changed, created, or deleted.
Console.WriteLi ne("File: " & e.FullPath & " " & e.ChangeType)
End Sub
Private Shared Sub OnRenamed(sourc e As Object, e As RenamedEventArg s)
' Specify what is done when a file is renamed.
Console.WriteLi ne("File: {0} renamed to {1}", e.OldFullPath,
e.FullPath)
End Sub
End Class
Michel Posseth [MCP]
"Andy B" <a_borka@sbcglo bal.netschreef in bericht
news:%238ulBQoJ JHA.4600@TK2MSF TNGP06.phx.gbl. ..What would i use to look for changes in a file every minute?
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Comment
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Re: Looking for contents in a file every minute
I need to look for things inside the file every minute even if the file
hasn't changed..
"Michel Posseth [MCP]" <MSDN@posseth.c omwrote in message
news:%23iw49isJ JHA.5576@TK2MSF TNGP05.phx.gbl. ..Hello Andy ,
>
If you want an event driven aproach go for the file system watcher as this
can give you an event when a change took place in a file
so also when there are 2 changes within a minute you get 2 change events .
>
Ofcourse you could also just use a timer , read the file in a string
variabel and compare the 2 strings if the 2 strings are not the same the
file has changed
however this wil cost you more CPU / IO cycles
>
>
Use the filesystem watcher to get notified when a change on the file took
place , and then reread / process the file
http://msdn.microsoft.com/en-us/libr...emwatcher.aspx
>
in the link i provided ( also in your previous post ) there is example
code included
in case you missed it
>
>
Public Class Watcher
>
Public Shared Sub Main()
>
Run()
>
End Sub
>
<PermissionSet( SecurityAction. Demand, Name:="FullTrus t")_
Private Shared Sub Run
>
Dim args() As String = System.Environm ent.GetCommandL ineArgs()
' If a directory is not specified, exit the program.
If args.Length <2 Then
' Display the proper way to call the program.
Console.WriteLi ne("Usage: Watcher.exe (directory)")
Return
End If
>
' Create a new FileSystemWatch er and set its properties.
Dim watcher As New FileSystemWatch er()
watcher.Path = args(1)
' Watch for changes in LastAccess and LastWrite times, and
' the renaming of files or directories.
watcher.NotifyF ilter = (NotifyFilters. LastAccess Or
NotifyFilters.L astWrite Or NotifyFilters.F ileName Or
NotifyFilters.D irectoryName)
' Only watch text files.
watcher.Filter = "*.txt"
>
' Add event handlers.
AddHandler watcher.Changed , AddressOf OnChanged
AddHandler watcher.Created , AddressOf OnChanged
AddHandler watcher.Deleted , AddressOf OnChanged
AddHandler watcher.Renamed , AddressOf OnRenamed
>
' Begin watching.
watcher.EnableR aisingEvents = True
>
' Wait for the user to quit the program.
Console.WriteLi ne("Press 'q' to quit the sample.")
While Chr(Console.Rea d()) <"q"c
End While
End Sub
>
' Define the event handlers.
Private Shared Sub OnChanged(sourc e As Object, e As
FileSystemEvent Args)
' Specify what is done when a file is changed, created, or deleted.
Console.WriteLi ne("File: " & e.FullPath & " " & e.ChangeType)
End Sub
>
Private Shared Sub OnRenamed(sourc e As Object, e As RenamedEventArg s)
' Specify what is done when a file is renamed.
Console.WriteLi ne("File: {0} renamed to {1}", e.OldFullPath,
e.FullPath)
End Sub
>
End Class
>
Michel Posseth [MCP]
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"Andy B" <a_borka@sbcglo bal.netschreef in bericht
news:%238ulBQoJ JHA.4600@TK2MSF TNGP06.phx.gbl. ..>>What would i use to look for changes in a file every minute?
>>
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Comment
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Re: Looking for contents in a file every minute
On Oct 6, 1:22 pm, "Andy B" <a_bo...@sbcglo bal.netwrote:Hi,I need to look for things inside the file every minute even if the file
hasn't changed..
"Michel Posseth [MCP]" <M...@posseth.c omwrote in messagenews:%23 iw49isJJHA.5576 @TK2MSFTNGP05.p hx.gbl...
>
>
>>Hello Andy ,>If you want an event driven aproach go for the file system watcher as this
can give you an event when a change took place in a file
so also when there are 2 changes within a minute you get 2 change events .>Ofcourse you could also just use a timer , read the file in a string
variabel and compare the 2 strings if the 2 strings are not the same the
file has changed
however this wil cost you more CPU / IO cycles>Use the filesystem watcher to get notified when a change on the file took
place , and then reread / process the file
http://msdn.microsoft.com/en-us/libr...emwatcher.aspx>in the link i provided ( also in your previous post ) there is example
code included
in case you missed it>Public Class Watcher>Public Shared Sub Main()>Run()>End Sub><PermissionSet( SecurityAction. Demand, Name:="FullTrus t")_
Private Shared Sub Run>Dim args() As String = System.Environm ent.GetCommandL ineArgs()
' If a directory is not specified, exit the program.
If args.Length <2 Then
' Display the proper way to call the program.
Console.WriteLi ne("Usage: Watcher.exe (directory)")
Return
End If>' Create a new FileSystemWatch er and set its properties.
Dim watcher As New FileSystemWatch er()
watcher.Path = args(1)
' Watch for changes in LastAccess and LastWrite times, and
' the renaming of files or directories.
watcher.NotifyF ilter = (NotifyFilters. LastAccess Or
NotifyFilters.L astWrite Or NotifyFilters.F ileName Or
NotifyFilters.D irectoryName)
' Only watch text files.
watcher.Filter = "*.txt">' Add event handlers.
AddHandler watcher.Changed , AddressOf OnChanged
AddHandler watcher.Created , AddressOf OnChanged
AddHandler watcher.Deleted , AddressOf OnChanged
AddHandler watcher.Renamed , AddressOf OnRenamed>' Begin watching.
watcher.EnableR aisingEvents = True>' Wait for the user to quit the program.
Console.WriteLi ne("Press 'q' to quit the sample.")
While Chr(Console.Rea d()) <"q"c
End While
End Sub>' Define the event handlers.
Private Shared Sub OnChanged(sourc e As Object, e As
FileSystemEvent Args)
' Specify what is done when a file is changed, created, or deleted.
Console.WriteLi ne("File: " & e.FullPath & " " & e.ChangeType)
End Sub>Private Shared Sub OnRenamed(sourc e As Object, e As RenamedEventArg s)
' Specify what is done when a file is renamed.
Console.WriteLi ne("File: {0} renamed to {1}", e.OldFullPath,
e.FullPath)
End Sub>End Class>Michel Posseth [MCP]
http://www.vbdotnetcoder.com>"Andy B" <a_bo...@sbcglo bal.netschreef in bericht
news:%238ulBQoJ JHA.4600@TK2MSF TNGP06.phx.gbl. ..What would i use to look for changes in a file every minute?- Hide quoted text -
- Show quoted text -
You can use a Timer with 60000-milisecond intervals without needing to
raise changed events. However you need to determine what you really
mean by calling "inside of file" and what you want to look for, for
example, if you're just intending to check a file's LastAccessTime,
you can try to use that:
Untested:
'-----------------------------------------------------
' File to check in every 60 seconds
Dim myfile As New FileInfo("c:\fi le.exe")
' Optional ArrayList to log LastAccessTime
Dim logArrList As New ArrayList
' Assuming your timer's interval is 60000 ms
Private Sub Timer1_Tick(ByV al sender As Object, _
ByVal System.EventArg s) Handles Timer1.Tick
' Preferably add the last entry to an ArrayList
' to log item as DateTime type
logArrList.Add( myfile.LastAcce ssTime)
End Sub
'--------------------------------------------------------
Note that, with the code above, the LastAccessTime will be added your
ArrayList eventhough your file's LastAccessTime doesn't change. But
you must be sure to use that because of consuming excessive I/O cycle
and system resources in every 1 minute.
Hope this helps,
Onur Güzel
Comment
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Re: Looking for contents in a file every minute
On Oct 6, 6:22 am, "Andy B" <a_bo...@sbcglo bal.netwrote:You should be able to make the assumption that what you have isI need to look for things inside the file every minute even if the file
hasn't changed..
"Michel Posseth [MCP]" <M...@posseth.c omwrote in messagenews:%23 iw49isJJHA.5576 @TK2MSFTNGP05.p hx.gbl...
>>Hello Andy ,>If you want an event driven aproach go for the file system watcher as this
can give you an event when a change took place in a file
so also when there are 2 changes within a minute you get 2 change events .>Ofcourse you could also just use a timer , read the file in a string
variabel and compare the 2 strings if the 2 strings are not the same the
file has changed
however this wil cost you more CPU / IO cycles>Use the filesystem watcher to get notified when a change on the file took
place , and then reread / process the file
http://msdn.microsoft.com/en-us/libr...emwatcher.aspx>in the link i provided ( also in your previous post ) there is example
code included
in case you missed it>Public Class Watcher>Public Shared Sub Main()>Run()>End Sub><PermissionSet( SecurityAction. Demand, Name:="FullTrus t")_
Private Shared Sub Run>Dim args() As String = System.Environm ent.GetCommandL ineArgs()
' If a directory is not specified, exit the program.
If args.Length <2 Then
' Display the proper way to call the program.
Console.WriteLi ne("Usage: Watcher.exe (directory)")
Return
End If>' Create a new FileSystemWatch er and set its properties.
Dim watcher As New FileSystemWatch er()
watcher.Path = args(1)
' Watch for changes in LastAccess and LastWrite times, and
' the renaming of files or directories.
watcher.NotifyF ilter = (NotifyFilters. LastAccess Or
NotifyFilters.L astWrite Or NotifyFilters.F ileName Or
NotifyFilters.D irectoryName)
' Only watch text files.
watcher.Filter = "*.txt">' Add event handlers.
AddHandler watcher.Changed , AddressOf OnChanged
AddHandler watcher.Created , AddressOf OnChanged
AddHandler watcher.Deleted , AddressOf OnChanged
AddHandler watcher.Renamed , AddressOf OnRenamed>' Begin watching.
watcher.EnableR aisingEvents = True>' Wait for the user to quit the program.
Console.WriteLi ne("Press 'q' to quit the sample.")
While Chr(Console.Rea d()) <"q"c
End While
End Sub>' Define the event handlers.
Private Shared Sub OnChanged(sourc e As Object, e As
FileSystemEvent Args)
' Specify what is done when a file is changed, created, or deleted.
Console.WriteLi ne("File: " & e.FullPath & " " & e.ChangeType)
End Sub>Private Shared Sub OnRenamed(sourc e As Object, e As RenamedEventArg s)
' Specify what is done when a file is renamed.
Console.WriteLi ne("File: {0} renamed to {1}", e.OldFullPath,
e.FullPath)
End Sub>End Class>Michel Posseth [MCP]
http://www.vbdotnetcoder.com"Andy B" <a_bo...@sbcglo bal.netschreef in bericht
news:%238ulBQoJ JHA.4600@TK2MSF TNGP06.phx.gbl. ..What would i use to look for changes in a file every minute?
correct (as the file hasn't changed) if the FileSystemWatch er hasn't
told you otherwise.
Thanks,
Seth Rowe [MVP]
Comment
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Re: Looking for contents in a file every minute
>I need to look for things inside the file every minute even if the fileHuh !? why would you do so ,why would a program need to reread the same>hasn't changed..
values every minute ???
hint : if the contents / values in the file change the filesystem watcher
would raise an event
HTH
Michel
"Andy B" <a_borka@sbcglo bal.netschreef in bericht
news:OKD1r15JJH A.5920@TK2MSFTN GP03.phx.gbl...>I need to look for things inside the file every minute even if the file
>hasn't changed..
"Michel Posseth [MCP]" <MSDN@posseth.c omwrote in message
news:%23iw49isJ JHA.5576@TK2MSF TNGP05.phx.gbl. ..>>Hello Andy ,
>>
>If you want an event driven aproach go for the file system watcher as
>this can give you an event when a change took place in a file
>so also when there are 2 changes within a minute you get 2 change events
>.
>>
>Ofcourse you could also just use a timer , read the file in a string
>variabel and compare the 2 strings if the 2 strings are not the same the
>file has changed
>however this wil cost you more CPU / IO cycles
>>
>>
>Use the filesystem watcher to get notified when a change on the file took
>place , and then reread / process the file
>http://msdn.microsoft.com/en-us/libr...emwatcher.aspx
>>
>in the link i provided ( also in your previous post ) there is example
>code included
>in case you missed it
>>
>>
>Public Class Watcher
>>
> Public Shared Sub Main()
>>
> Run()
>>
> End Sub
>>
> <PermissionSet( SecurityAction. Demand, Name:="FullTrus t")_
> Private Shared Sub Run
>>
> Dim args() As String = System.Environm ent.GetCommandL ineArgs()
> ' If a directory is not specified, exit the program.
> If args.Length <2 Then
> ' Display the proper way to call the program.
> Console.WriteLi ne("Usage: Watcher.exe (directory)")
> Return
> End If
>>
> ' Create a new FileSystemWatch er and set its properties.
> Dim watcher As New FileSystemWatch er()
> watcher.Path = args(1)
> ' Watch for changes in LastAccess and LastWrite times, and
> ' the renaming of files or directories.
> watcher.NotifyF ilter = (NotifyFilters. LastAccess Or
>NotifyFilters. LastWrite Or NotifyFilters.F ileName Or
>NotifyFilters. DirectoryName)
> ' Only watch text files.
> watcher.Filter = "*.txt"
>>
> ' Add event handlers.
> AddHandler watcher.Changed , AddressOf OnChanged
> AddHandler watcher.Created , AddressOf OnChanged
> AddHandler watcher.Deleted , AddressOf OnChanged
> AddHandler watcher.Renamed , AddressOf OnRenamed
>>
> ' Begin watching.
> watcher.EnableR aisingEvents = True
>>
> ' Wait for the user to quit the program.
> Console.WriteLi ne("Press 'q' to quit the sample.")
> While Chr(Console.Rea d()) <"q"c
> End While
> End Sub
>>
> ' Define the event handlers.
> Private Shared Sub OnChanged(sourc e As Object, e As
>FileSystemEven tArgs)
> ' Specify what is done when a file is changed, created, or
>deleted.
> Console.WriteLi ne("File: " & e.FullPath & " " & e.ChangeType)
> End Sub
>>
> Private Shared Sub OnRenamed(sourc e As Object, e As RenamedEventArg s)
> ' Specify what is done when a file is renamed.
> Console.WriteLi ne("File: {0} renamed to {1}", e.OldFullPath,
>e.FullPath)
> End Sub
>>
>End Class
>>
>Michel Posseth [MCP]
>http://www.vbdotnetcoder.com
>>
>>
>>
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>>
>>
>>
>"Andy B" <a_borka@sbcglo bal.netschreef in bericht
>news:%238ulBQo JJHA.4600@TK2MS FTNGP06.phx.gbl ...>>>>What would i use to look for changes in a file every minute?
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