Hello Michel,
If you use Mutex then you can restrict a single instance per user.
Also you can create a global Mutex to restrict single instance per machine.
using System.Threading;
Mutex processMutex = new Mutex(false,"Your Application Name");
if (processMutex.WaitOne(0, false) == false)
{
//Multiple intstance detected.
}//if
//Approach 2
using System.Threading;
bool isFirstInstance;
Mutex processMutex = new Mutex(true, "Your Application Name", out
isFirstinstance);
if(!isFirstInstance)
{
//Multiple instance detected.
}//
//If you plan to do one instance per machine create the mutex this way
Mutex processMutex = new Mutex(true, "Global\\" + "Your Application Name",
out isFirstinstance);
The important point to note is dont forget to release/dispose the mutex
when there is an error or when you are done with the applications. Best
place is to do the mutex release in the finally block.
if (processMutex != null)
{
processMutex.Close();
processMutex = null;
}//if
Hope this helps,
--------------------
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<xS**************@TK2MSFTNGXA03.phx.gbl>Subject: RE: Identify multiple running instances of an application
Date: Tue, 14 Mar 2006 05:38:39 -0800
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Hi Nanda, thank you for your answer. Your code will work but the problem I
have is how to find the process used by a specific user. Many users can
connect by remote sessions on a computer to run my application. I whant to
restrict 1 instance by user. The code you suggest to me can find the
process(my app) of another user connected remotly to the computer, and I don't
whantit... is it possible to do this ? I don't know.... :(
thank you for your help....
Michel
"Nanda Lella[MSFT]" wrote:
If you know the name of the process you can do something like this
using System.Diagnostics;
if (Process.GetProcessesByName(processName).Length > 0)
return true;
// where processName is the process you are looking for.
The other option is; you can use a Mutex and verify if the Mutex already
exists.
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>Subject: Identify multiple running instances of an application
>Date: Mon, 13 Mar 2006 06:06:28 -0800
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>
>Hi, I wrote an app in .Net and I whant only 1 instance of this app open
for >the user; the user open my app, do some works and try to open another
>instance of my app, I whant to show a message to user to inform him
that only >one instance is permit and then close the second instance after that.
>
>I am able to do this when the user run the application on his PC whit
this : >
>Process.GetProcessesByName(Process.GetCurrentProc ess.ProcessName)
>
>and if I found the name of my app in the returned collection, I display
the >message and close the seconde instance.
>
>The problem now: if my application is used by Remote session on a
central PC >who others users can also open my application at the same time, I would
like >to let the others users open my app. The only one contrainte is one
instance >by user. The code I used does not work in this scenario.
>
>Does anyone have idea to solution this ?
>
>Thanks a lot
>Michel
>
--
Thank You,
Nanda Lella,
This Posting is provided "AS IS" with no warranties, and confers no
rights.
--
Thank You,
Nanda Lella,
This Posting is provided "AS IS" with no warranties, and confers no rights.
