Prevent Openning the program twice

25/04/2005 9.17.52
Tolga Tanriverdi <to***@sylveria.gen.tr> wrote in message
<#M**************@TK2MSFTNGP15.phx.gbl>

I made a gui program with c# but i want even if people double click my program more than once it would only open once
is something like that possible if it is how?

I've used this class and worked fine..it is in vb.net, I hope this is
not a problem...
http://www.codeproject.com/vb/net/sing_inistan.asp

Process currentProcess = Process.GetCurrentProcess();
if(Process.GetProcessesByName(currentProcess.Proce ssName,
currentProcess.MachineName).Length>1)
{
Console.Write("Already running");
Console.Read();
}

Gabriel Lozano-Morán

"Tolga Tanriverdi" <to***@sylveria.gen.tr> wrote in message
news:%2****************@TK2MSFTNGP15.phx.gbl...

I made a gui program with c# but i want even if people double click my
program more than once it would only open once
is something like that possible if it is how?

Use a global mutex to identify your running instance.
This way you prevent running multiple instances machine wide.

bool freeToRun;
string safeName = "Global\\StringUniquelyIdentifyingThisApplication" ;
using(System.Threading.Mutex m = new System.Threading.Mutex(true, safeName
, out freeToRun))
{
if (freeToRun)
Application.Run (new MainForm());
MessageBox.Show("Already running...", safeName);
}

Willy.

25/04/2005 10.29.30
"LOZANO-MORÁN, Gabriel" <ga************@no-spam.com> wrote in message
<OO**************@TK2MSFTNGP14.phx.gbl>

Process currentProcess = Process.GetCurrentProcess();
if(Process.GetProcessesByName(currentProcess.Proce ssName,
currentProcess.MachineName).Length>1)
{
Console.Write("Already running");
Console.Read();
}

Gabriel Lozano-Morán

Gabriel, this is not a good way for several reasons (also MSDN
indicates this limits): it couldn't work due to limited user rights,
or if performance counters are disabled. The best solution is to use
mutex, as indicated by Willy...also in VB2005 implementation they use
mutex!

Tolga Tanriverdi <to***@sylveria.gen.tr> wrote:

I made a gui program with c# but i want even if people double click my
program more than once it would only open once
is something like that possible if it is how?

This is in the FAQ:
http://www.yoda.arachsys.com/csharp/...ation.instance

Aah so in the 2005 we can get Application Previous instance easier right?

"Ste" <no@no.com> wrote in message
news:%2****************@TK2MSFTNGP14.phx.gbl...

25/04/2005 10.29.30
"LOZANO-MORÁN, Gabriel" <ga************@no-spam.com> wrote in message
<OO**************@TK2MSFTNGP14.phx.gbl>

Process currentProcess = Process.GetCurrentProcess();
if(Process.GetProcessesByName(currentProcess.Proce ssName,
currentProcess.MachineName).Length>1)
{
Console.Write("Already running");
Console.Read();
}

Gabriel Lozano-Morán

Gabriel, this is not a good way for several reasons (also MSDN
indicates this limits): it couldn't work due to limited user rights,
or if performance counters are disabled. The best solution is to use
mutex, as indicated by Willy...also in VB2005 implementation they use
mutex!

"kids_pro" <ki******@yahoo.com> wrote in message
news:ud**************@TK2MSFTNGP09.phx.gbl...

Aah so in the 2005 we can get Application Previous instance easier right?

Easier than what?

Willy.

Willy I think that what he is trying to say is that in VB6 we have
App.PrevInstance and it would be a nice addition to future versions of the
..NET base class library to have something similar.

Gabriel Lozano-Morán

"Willy Denoyette [MVP]" <wi*************@telenet.be> wrote in message
news:#v**************@TK2MSFTNGP10.phx.gbl...

"kids_pro" <ki******@yahoo.com> wrote in message
news:ud**************@TK2MSFTNGP09.phx.gbl...

Aah so in the 2005 we can get Application Previous instance easier right?

Easier than what?

Willy.

"LOZANO-MORÁN, Gabriel" <ga************@no-spam.com> wrote in message
news:Oh**************@tk2msftngp13.phx.gbl...

Willy I think that what he is trying to say is that in VB6 we have
App.PrevInstance and it would be a nice addition to future versions of the
.NET base class library to have something similar.

Gabriel Lozano-Morán

The problem with App.PrevInstance is that it fails in a TS environment and
that it can't be used for non windows applications.

Willy.