"Dinsdale" <russ.ha***@gmail.com> wrote in message
news:1149204877.549357.78020@f6g2000cwb.googlegroups.com...
|I have recently added a mutex to the startup of an application to stop
| users from opening multiple instances. Works great except the
| application no longer works on NT4. The error I get is:
|
| The Application has generated an exception that could not be handled.
|
| Process id = 0x12b (299), Thread id = 0x100 (256)
|
| To test my theory, I created a small windows form app and ran it with
| no problems. I added the same mutex code to it and received the same
| error as noted above.
|
| I double checked in MSDN and it claims the Mutex class is compatible
| with NT4, but my experience seems to be telling me otherwise. Here is
| the mutex code I'm using:
|
| public class Form1 : System.Windows.Forms.Form
| {
|
|    //....(designer code and properties here)
|    public static bool _bFirstInstance;
|    public static Mutex _mtxSingleInstance;
|
|    //....(other functionality)
|    [STAThread]
|    static void Main()
|    {
|        //This mutex is used to ensure that only one copy of the
| application is running at any time.
|        _mtxSingleInstance = new Mutex(false,
| "Local\\MY_MUTEX_SINGLE_INSTANCE", out _bFirstInstance);
|        if(_bFirstInstance)
|        {
|            // If _bFirstInstance is now true, we're the first instance
| of the application;
|            // otherwise another instance is running and this will not
| be called and the applicaiton
|            // will not start.
|            Application.Run(new Form1());
|        }
|        else
|        {
|            string strOutput = "There is already an instance of the
| application running.\r\n"
|                + "Please check the Icon Tray (right hand side of the
| toolbar) for the icon.";
|            MessageBox.Show(strOutput);
|            ///Else we need to bring up the running instance.
|            ///If we cannot, we need to shut it down and start it
| again.
|        }
|    }
| }
|
| Does anybody have any information on this issue? IS the Mutex class
| compatible with NT4 (sp6a)? Is there an issue with my code???
|
| Any help would be great.
|
| Cheers!
| Russ
|

"Dinsdale" <russ.ha***@gmail.com> wrote in message
news:1149204877.549357.78020@f6g2000cwb.googlegroups.com...
|I have recently added a mutex to the startup of an application to stop
| users from opening multiple instances. Works great except the
| application no longer works on NT4. The error I get is:
|
| The Application has generated an exception that could not be handled.
|
| Process id = 0x12b (299), Thread id = 0x100 (256)
|
| To test my theory, I created a small windows form app and ran it with
| no problems. I added the same mutex code to it and received the same
| error as noted above.
|
| I double checked in MSDN and it claims the Mutex class is compatible
| with NT4, but my experience seems to be telling me otherwise. Here is
| the mutex code I'm using:
|
| public class Form1 : System.Windows.Forms.Form
| {
|
|    //....(designer code and properties here)
|    public static bool _bFirstInstance;
|    public static Mutex _mtxSingleInstance;
|
|    //....(other functionality)
|    [STAThread]
|    static void Main()
|    {
|        //This mutex is used to ensure that only one copy of the
| application is running at any time.
|        _mtxSingleInstance = new Mutex(false,
| "Local\\MY_MUTEX_SINGLE_INSTANCE", out _bFirstInstance);
|        if(_bFirstInstance)
|        {
|            // If _bFirstInstance is now true, we're the first instance
| of the application;
|            // otherwise another instance is running and this will not
| be called and the applicaiton
|            // will not start.
|            Application.Run(new Form1());
|        }
|        else
|        {
|            string strOutput = "There is already an instance of the
| application running.\r\n"
|                + "Please check the Icon Tray (right hand side of the
| toolbar) for the icon.";
|            MessageBox.Show(strOutput);
|            ///Else we need to bring up the running instance.
|            ///If we cannot, we need to shut it down and start it
| again.
|        }
|    }
| }
|
| Does anybody have any information on this issue? IS the Mutex class
| compatible with NT4 (sp6a)? Is there an issue with my code???
|
| Any help would be great.
|
| Cheers!
| Russ
|

> The mutex name cannot contain a backslash on NT4, so ,
> "Local\\MY_MUTEX_SINGLE_INSTANCE" is illegal.
> Note also that NT4 does not know anything about global or local kernel
> object namespaces, remove local\\ from your name and all should be fine.
>
> Willy.

> Will local then be assumed on other platforms (Win2k, XP, 2003?)
>
> Willy Denoyette [MVP] wrote:
> > The mutex name cannot contain a backslash on NT4, so ,
> > "Local\\MY_MUTEX_SINGLE_INSTANCE" is illegal.
> > Note also that NT4 does not know anything about global or local kernel
> > object namespaces, remove local\\ from your name and all should be fine.
> >
> > Willy.

"Dinsdale" <russ.ha***@gmail.com> wrote in message
news:1149261915.283631.266040@f6g2000cwb.googlegroups.com...
| Will local then be assumed on other platforms (Win2k, XP, 2003?)
|
| Willy Denoyette [MVP] wrote:
| > The mutex name cannot contain a backslash on NT4, so ,
| > "Local\\MY_MUTEX_SINGLE_INSTANCE" is illegal.
| > Note also that NT4 does not know anything about global or local kernel
| > object namespaces, remove local\\ from your name and all should be fine.
| >
| > Willy.
|