System Shutdown

When my application is closed by the user, I want to shutdown the system also. How to go for it??

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the easiest way is to send this command:

Code:

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shell("shutdown -t 0 -s")

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that tells the computer to shutdown within 0 seconds so the user doesn't see the box telling them it is being shutdown.

for more info on that command, goto a command prompt, type 'shutdown' and you'll see the entire argument list. you can even restart the pc using that command.

shell is an old vb6 command.

the .NET equivalent is the Process.Start function.

Why do you want to shutdown the system when they close your app?

Quote:

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Originally Posted by tr333

shell is an old vb6 command.

the .NET equivalent is the Process.Start function.

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Well the shell code still works in vb. net

Quote:

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Why do you want to shutdown the system when they close your app?

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Maybe it's a kind of virus :p

Quote:

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Originally Posted by tr333

shell is an old vb6 command.

the .NET equivalent is the Process.Start function.

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agreed, however, it looked cleaner on my particular machine using the above command rather than this:

VB Code:

Process.Start("shutdown", "-t 0 -s")

it just seemed like it didn't take as long etc etc.

but you're right. Process.Start() is the 'dot net' way.

Shell() wraps the CreateProcess

Process.Start uses both CreateProcess/ShellExecuteEx (by default uses ShellExecuteEx)

VB Code:

Dim sdwn As New ProcessStartInfo("shutdown", "-t 0 -s")
 
        sdwn.CreateNoWindow = True
        sdwn.UseShellExecute = False ' use the same api as Shell()
 
        Process.Start(sdwn)

This should have no noticeable speed difference from Shell().

Well, I am not developing any virus as such. I have a given an option to the user where after the backup is taken the system should be powered off. Found the code in this forum.

VB Code:

Imports System.Management
 
Public Class clsWMI
    Private obj As Object
 
    Public Enum ShutDownOptions
        LogOff = 0
        SHUTDOWN = 1
        REBOOT = 2
        FORCE = 4
        POWEROFF = 8
    End Enum
 
    Public WriteOnly Property ShutDown() As Integer
        'Value should be ShutDownOptions
        Set(ByVal Value As Integer)
            For Each obj In GetObject("winmgmts:{(shutdown)}").ExecQuery("Select * from Win32_OperatingSystem")
                obj.Win32Shutdown(Value)
            Next
        End Set
    End Property
End Class

Regards