CeRunAppAtEvent / Mutex

[Miguel]

I am experiencing the following problem.
F.e.
I want to run an application on the wakeup event of the mobile device.
I only want one instance of the application running at the given time (
single process).
The application itself just shows something on the screen, which is not
relevant to the problem.
CeRunAppAtEvent seemed to solve the problem.
However at wakeup, a new instance of the application is started.
Is there an easy solution to overcome this (perhaps by mutex or event)
an how do I have to implement this feature?

Regards

[Chris Tacke, eMVP]

Correct, the answer is with a mutex. At app startup check for the mutex, if
it's already taken you need to shut down the current instance and activate
the other. A thread in the app specifically waiting for such an event is a
good mechanism for this.

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"Miguel" <miguel...@telenet.be> wrote in message
news:1127134435.1...@g49g2000cwa.googlegroups.com...

[Miguel]

I'm rather new to mutex.
Could you provide a small example how to achieve this?
I'd be grateful

Regards

[Sergey Bogdanov]

See this example [1] which demonstrates how to create a single instance
application by using named events. For mutexes the idea is the same.

[1] http://www.sergeybogdanov.com/Samples/SPSingleInstance.zip

--
Sergey Bogdanov [.NET CF MVP, MCSD]
http://www.sergeybogdanov.com

[Miguel]

My application is not a graphical one
It's merely an application that does some stuff in the background

Will this work aswell, since you're working with FindWindow (and there
isn't)

Regards

[Sergey Bogdanov]

This will work as well it doesn't matter what application you have. The
main part of the code is:

IntPtr evnt = CreateEvent(IntPtr.Zero, false, false, AppNamedEvent);
if (Marshal.GetLastWin32Error() != 0)
{
// one instance of application is run,
// do work
}
...

CloseHandle(evnt);

--
Sergey Bogdanov [.NET CF MVP, MCSD]
http://www.sergeybogdanov.com