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Application doesn't close on Shut Down - Please help!I have a small application which uses a NotifyIcon. The user can set a flag (PreventClosing ) so that when he clicks on the form-cancel button "X", the program will instead be minimized in the icon try. See code attached. My problem is that my code is probably too naive. In fact there is a problem when one tries to shut dow or restart Windows. Windows does NOT want to shut down! I guess it's the e.cancel = TRUE statement in the closing handler that prevents it. Could anybody by so kind as to suggest me the correct approach to do this. Is there a way to detect the the closing is due to system restart or shutdown? Thank you very much in advance, -Pam ----------------------------------------------------------------------------- Private PreventClosing As Boolean 'if this is set TRUE by the user, the program minimizes (instead of closing) when "X" is pressed Private ShowInTaskbarSaved As Boolean Private WindowStateSaved As FormWindowState '... Private Sub Form1_Closing(ByVal sender As Object, ByVal e As System.ComponentModel.CancelEventArgs) Handles MyBase.Closing If Me.PreventClosing Then Me.HideInTrayIcon() e.Cancel = True End If End Sub Private Sub HideInTrayIcon() Me.WindowStateSaved = Me.WindowState Me.WindowState = FormWindowState.Minimized Me.ShowInTaskbar = False Me.NotifyIcon1.Visible = True End Sub '... Private Sub RestoreWindow() Me.NotifyIcon1.Visible = False Me.ShowInTaskbar = Me.ShowInTaskbarSaved Me.WindowState = Me.WindowStateSaved Me.Show() Me.Focus() End Sub ---------------------- thank you in advance -Pam pamelaflue***@libero.it wrote:
Show quoteHide quote > Hi Guys, You may want to look at this site. It has info on handling win32 events.> > I have a small application which uses a NotifyIcon. The user can set a > flag (PreventClosing ) so that when he clicks on the form-cancel button > "X", the program will instead be minimized in the icon try. See code > attached. > > My problem is that my code is probably too naive. In fact there is a > problem when one tries to shut dow or restart Windows. Windows does NOT > want to shut down! I guess it's the e.cancel = TRUE statement in the > closing handler that prevents it. > > Could anybody by so kind as to suggest me the correct approach to do > this. Is there a way to detect the the closing is due to system restart > or shutdown? > > Thank you very much in advance, > > -Pam > > ----------------------------------------------------------------------------- > > > > Private PreventClosing As Boolean > 'if this is set TRUE by the user, the program minimizes (instead of > closing) when "X" is pressed > > > Private ShowInTaskbarSaved As Boolean > Private WindowStateSaved As FormWindowState > '... > Private Sub Form1_Closing(ByVal sender As Object, ByVal e As > System.ComponentModel.CancelEventArgs) Handles MyBase.Closing > If Me.PreventClosing Then > Me.HideInTrayIcon() > e.Cancel = True > End If > End Sub > > Private Sub HideInTrayIcon() > Me.WindowStateSaved = Me.WindowState > Me.WindowState = FormWindowState.Minimized > Me.ShowInTaskbar = False > Me.NotifyIcon1.Visible = True > End Sub > > '... > Private Sub RestoreWindow() > Me.NotifyIcon1.Visible = False > Me.ShowInTaskbar = Me.ShowInTaskbarSaved > Me.WindowState = Me.WindowStateSaved > Me.Show() > Me.Focus() > End Sub > > ---------------------- > > thank you in advance > > -Pam > http://www.codeworks.it/net/Sysevents.htm You should be able to use it to get notified that the system (or session) wants to shutdown, and close your program. Never tried it, but in my head, it should work. Chris Dear Chris,
Thank you VERY much for your suggestion. I have read the implementation, trying to do what you seems to suggest (hope I have correctly interpreted). See attached code changes. There is however a big problem. The CLOSING event is called BEFORE SystemEvents.SessionEnding. So the System Shut Down is blocked before I can detect the session is being shutting down! :-( What can I do ? Thank you very much for your patience !! -Pam -------------- Imports Microsoft.Win32 Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load '.... AddHandler SystemEvents.SessionEnding, AddressOf Me.SessionEnding End Sub Private Sub Form1_Closing(ByVal sender As Object, ByVal e As System.ComponentModel.CancelEventArgs) Handles MyBase.Closing MsgBox("Program Closing") 'here we get! If Not Me.SessionIsEnding AndAlso Me.PreventClosing Then Me.HideInTrayIcon() e.Cancel = True Else Me.NotifyIcon1.Visible = False End If End Sub Private SessionIsEnding As Boolean Public Sub SessionEnding(ByVal sender As Object, ByVal e As SessionEndingEventArgs) MsgBox("SessionEnding") 'never get here :-( Me.SessionIsEnding = True End Sub -------------------------------------------- thank you very much, -Pam I answered this question a few days ago. Of couse you can ommit the
MessageBox & just let your application close on Windows shutdown Private Shared WM_QUERYENDSESSION As Integer = &H11 Private Shared systemShutdown As Boolean = False Protected Overrides Sub WndProc(ByRef m As System.Windows.Forms.Message) If m.Msg = WM_QUERYENDSESSION Then MessageBox.Show("queryendsession: this is a logoff, shutdown, or reboot") systemShutdown = True End If ' If this is WM_QUERYENDSESSION, the closing event should be fired in the base WndProc MyBase.WndProc(m) End Sub 'WndProc Private Sub Form1_Closing(ByVal sender As System.Object, ByVal e As System.ComponentModel.CancelEventArgs) Handles MyBase.Closing If (systemShutdown) Then ' reset the variable since they may cancel the shutdown systemShutdown = False If (DialogResult.Yes = _ MessageBox.Show("My application", "Would you care to save your work before logging off?", MessageBoxButtons.YesNo)) Then e.Cancel = True Else e.Cancel = False End If End If End Sub I hope that helps Crouchie1998 BA (HONS) MCP MCSE Thank you VERY VERY much Del !! It works perfectly and is exactly what
I needed. Del ha scritto: > I answered this question a few days ago. Of couse you can ommit the Ah. Please, excuse me. I can't read this fantastic group regularly> MessageBox & just let your application close on Windows shutdown > Private Shared WM_QUERYENDSESSION As Integer = &H11 Very much! .... > I hope that helps > See you soon.> Crouchie1998 > BA (HONS) MCP MCSE -Pam 
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