Comments on: Single instance applications in Windows CE

By: Karen Austrin

Karen Austrin — Thu, 17 May 2012 06:52:15 +0000

Is Windows CE on the way out? Compared with other OS’s I think they would be better off re-branding it

By: Singh

Singh — Thu, 19 Jan 2012 08:45:19 +0000

This is a perfect and simple solution. Thanks Jacob!

By: Bocote

Bocote — Thu, 14 Jul 2011 13:47:18 +0000

Fantastic – Just what I wanted.

I added two additional Functions that suited my application

public static Boolean IsRunning()
{
Boolean IsRunning;
String name = System.Reflection.Assembly.GetExecutingAssembly().GetName().Name;
IntPtr mutexHandle = CreateMutex(IntPtr.Zero, true, name);
long error = Marshal.GetLastWin32Error();
IsRunning = (error == ERROR_ALREADY_EXISTS);
ReleaseMutex(mutexHandle);

return (IsRunning);
}

public static Boolean IsNotRunning()
{
return (!IsRunning());
}

By: Como asegurar una única instancia de una aplicación en Windows CE « JorgeOrtiz’s Weblog

Mon, 27 Sep 2010 22:23:28 +0000

[...] http://bitmatic.com/compact-framework/single-instance-applications-in-windows-ce [...]

By: Wong Chi Kai Andrew

Wong Chi Kai Andrew — Fri, 10 Sep 2010 08:49:50 +0000

THX! It is work in VB.net CF

Imports System
Imports System.Windows.Forms
Imports System.Runtime.InteropServices
Imports System.Reflection

Public Class SingleInstanceApplication

_
Public Shared Function CreateMutex(ByVal Attr As IntPtr, ByVal Own As Boolean, ByVal Name As String) As IntPtr

End Function

_
Public Shared Function ReleaseMutex(ByVal hMutex As IntPtr) As Boolean

End Function

Const ERROR_ALREADY_EXISTS As Long = 183

Public Shared Sub Run(ByVal frm As Form)
Dim name As String = Assembly.GetExecutingAssembly().GetName().Name
Dim mutexHandle As IntPtr = CreateMutex(IntPtr.Zero, True, name)
Dim Rerror As Long = Marshal.GetLastWin32Error()

If (Not Rerror = ERROR_ALREADY_EXISTS) Then
Application.Run(frm)
End If

ReleaseMutex(mutexHandle)

End Sub

End Class

=========================================================
Execute the Application this way:

Imports System.IO
Imports System.Globalization

Public Class AppStart

Public Shared Sub Main()

Try
SingleInstanceApplication.Run(New FrmLogin())

Catch ex As Exception
MessageBox.Show(ex.Message)
End Try

End Sub

End Class

By: domingo

domingo — Fri, 09 Jul 2010 21:41:51 +0000

I work in VB for Windows Mobile. I translated your code and this is what I have:
Dim Sistema As uso
Dim System.Windows.Forms As uso
Dim System.Runtime.InteropServices As uso
Dim System.Reflection As uso
Dim de As espacioDim Bitmatic As nombres
Dim clase As estáticoDim
( DllImport (” coredll.dll “, SetLastError = verdadero)) público estático externo CreateMutex IntPtr ( IntPtr Attr , bool Propios, cadena Nombre )
( DllImport (” coredll.dll “, SetLastError = verdadero)) público estático externo bool ReleaseMutex ( hMutex IntPtr )
Const ERROR_ALREADY_EXISTS As largo = 183
Function estático(Formulario As frm) As públicoEjecutar As vacío
Dim name As cadena = Assembly.GetExecutingAssembly (). getName () . Nombre
Dim mutexHandle As IntPtr = CreateMutex ( IntPtr.Zero , verdadero, Nombre)
Dim error As largo = Marshal.GetLastWin32Error ()
Dim (Error As siDim ERROR_ALREADY_EXISTS As Not = ) Application.Run (frm )
ReleaseMutex ( mutexHandle )

End Function
************************************************
It does not work. Please can you tell me am I doing wrong?

By: Alden

Alden — Mon, 24 May 2010 12:25:06 +0000

It works perfect.Thanks a lot!

By: Bruce

Bruce — Wed, 19 May 2010 15:29:41 +0000

This worked great! Thanks.

Do you know of a way to set focus back to the running app instead of just exiting (if the application is minimized for example).

By: Mary

Mary — Thu, 06 May 2010 09:45:19 +0000

Very useful. I am going to try this now. IF there is any problem, I will contact you.

By: Will

Will — Fri, 12 Mar 2010 13:37:17 +0000

I was heading down the route of adding and deleting values to the Win32 API atom table and checking all references for any atoms that exist are still running. This is a much simpler and more elegant solution!

Saved me a lot of time, thanks!