how to make other client macine to log off

[pksucks]

In a client server enviornment, how to make other system(client) log off using programming statement written in .net ? i am developing an application which will control the log off of other systems. should i use some windows API ?

 

[Haxaro]

Depending on your application, you could send data (how ever you are transferring commands), such as a string saying: "Log Off Computer"

Depending on the mechanism you are using, you should then be able to check for the arrival of information, and if a string arrives that = "Log Off Computer" then it should run this bit of code:

System.Diagnostics.Process.Start("shutdown", "-l -t 00")

The entire code should then look something similar of this (for the client)

    Private Sub On Stringreceived (depending on how you are sending the data)
    Dim NewInformation = Received String
        If NewInformation = "Log Off Computer" Then
            System.Diagnostics.Process.Start("shutdown", "-l -t 00")
        End If
    End Sub

Hope this helps

Also, you can shut down and restart using a very similar code:

rivate Sub btnShutdown_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnShutdown.Click
        System.Diagnostics.Process.Start("shutdown", "-s -t 00")
        'This will make the computer Shutdown
    End Sub

    Private Sub btnRestart_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnRestart.Click
        System.Diagnostics.Process.Start("shutdown", "-r -t 00")
        'This will make the computer Restart
    End Sub

    Private Sub btnLogOff_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnLogOff.Click
        System.Diagnostics.Process.Start("shutdown", "-l -t 00")
        'This will make the computer Log Off
    End Sub

 

[Haxaro]

Hey, can you please reply on the main thread, so others can benefit from the information too

Ok, first im asumming you may want to make this application invisible?
so you would start using a code to make it invisible:

Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        Me.Hide()
        Me.ShowInTaskbar = False
    End Sub

You then have several options to tell the client computers (say you have three - 1, 2, 3) when the time has started, and when their time has finished (You may want to put a timer in the bottom corner or something so the user knows how much time has elapsed, or is remaining)

Methods of telling the computer to turn off could include: eMail or WinSock.

Sorry, but im not really sure how to use WinSock in vb2005 or 2008, so i cant help much there, and i know how to send emails, but not receive them, although i am sure there are some other people on this forum that are more experienced than me, and would be able to tell you how to send packets over a network, or directly over the internet.

Now, on the sever side (mainframe computer), You should time how long each user is online, so when a new user buys time, you click a button, with a time in a text box, and it starts counting down (or up). You could do this by using a timer that ticks every second, and a i = i + 1 function. or in your case it would be a User1Time = User1Time + (or - 1) depending on the time that they have chosen. If you want an app that counts in minutes, i will upload it if you request.

So if you have any more questions about how to structure the program on either end, but i am not completly sure as to getting the information across the computers.

Hope this helps

HaXarO

 

[Haxaro]

Some resources that could help:

.NET Remoting and Event Handling in VB .NET — CodeGuru.com

Building a secure private chat application with VB.NET

And this premade application looks helpful if you have some experience with VB
VB.NET Chat Server Program