How to limit program can only run one instance.

[Boki Digtal]

Hi All,

How to limit the c# program can only run one instance at the same
time ?

Thank you!

Best regards,
Boki.

[Mark Rae [MVP]]

Re: How to limit program can only run one instance.

"Boki Digtal" <bokiteam@ms21. hinet.netwrote in message news:1185184038 .720113.13850@x 35g2000prf.goog legroups.com...

How to limit the c# program can only run one instance at the same
time ?

using System.Threadin g;

bool blnFirstInstanc e;

using (Mutex objMutex = new Mutex(false, "Local\\" + "<app name>", out blnFirstInstanc e))
{
if (!blnFirstInsta nce)
{
MessageBox.Show ("<app nameis already running", "Single Use Only", MessageBoxButto ns.OK, MessageBoxIcon. Stop);
Application.Exi t();
}
else
{
Application.Run (new Form1()); // or whatever your startup is...
}
}


--
Mark Rae
ASP.NET MVP

http://www.markrae.net

[Boki Digtal]

Re: How to limit program can only run one instance.

On 7 23 , 6 11 , "Mark Rae [MVP]" <m...@markNOSPA Mrae.netwrote:

"Boki Digtal" <bokit...@ms21. hinet.netwrote in messagenews:118 5184038.720113. 13850@x35g2000p rf.googlegroups .com...

How to limit the c# program can only run one instance at the same
time ?

>
using System.Threadin g;
>
bool blnFirstInstanc e;
>
using (Mutex objMutex = new Mutex(false, "Local\\" + "<app name>", out blnFirstInstanc e))
{
if (!blnFirstInsta nce)
{
MessageBox.Show ("<app nameis already running", "Single Use Only", MessageBoxButto ns.OK, MessageBoxIcon. Stop);
Application.Exi t();
}
else
{
Application.Run (new Form1()); // or whatever your startup is...
}
>
}
>
--
Mark Rae
ASP.NET MVPhttp://www.markrae.net

Great, thanks!

Boki.

[Boki Digtal]

Re: How to limit program can only run one instance.

On 7 24 , 2 27 , Boki Digtal <bokit...@ms21. hinet.netwrote:

On 7 23 , 6 11 , "Mark Rae [MVP]" <m...@markNOSPA Mrae.netwrote:
>
>
>

"Boki Digtal" <bokit...@ms21. hinet.netwrote in messagenews:118 5184038.720113. 13850@x35g2000p rf.googlegroups .com...

How to limit the c# program can only run one instance at the same
time ?

>

using System.Threadin g;

>

bool blnFirstInstanc e;

>

using (Mutex objMutex = new Mutex(false, "Local\\" + "<app name>", out blnFirstInstanc e))
{
if (!blnFirstInsta nce)
{
MessageBox.Show ("<app nameis already running", "Single Use Only", MessageBoxButto ns.OK, MessageBoxIcon. Stop);
Application.Exi t();
}
else
{
Application.Run (new Form1()); // or whatever your startup is...
}

>

}

>

--
Mark Rae
ASP.NET MVPhttp://www.markrae.net

>
Great, thanks!
>
Boki.

Is there any easier way like OnlyOneInstance = ture;

Thanks :)

Boki.

[Mark Rae [MVP]]

Re: How to limit program can only run one instance.

"Boki Digtal" <bokiteam@ms21. hinet.netwrote in message
news:1185758482 .386552.83280@i 38g2000prf.goog legroups.com...

using System.Threadin g;

>>

bool blnFirstInstanc e;

>>

using (Mutex objMutex = new Mutex(false, "Local\\" + "<app name>", out
blnFirstInstanc e))
{
if (!blnFirstInsta nce)
{
MessageBox.Show ("<app nameis already running", "Single Use
Only", MessageBoxButto ns.OK, MessageBoxIcon. Stop);
Application.Exi t();
}
else
{
Application.Run (new Form1()); // or whatever your startup
is...
}
}

>>
>Great, thanks!

>
Is there any easier way like OnlyOneInstance = ture;

An easier way? The above is only a dozen lines of code...

Can't you get it to work, then...?


--
Mark Rae
ASP.NET MVP

http://www.markrae.net

[Boki Digtal]

Re: How to limit program can only run one instance.

On 7 30 , 1 51 , "Mark Rae [MVP]" <m...@markNOSPA Mrae.netwrote:

"Boki Digtal" <bokit...@ms21. hinet.netwrote in message
>
news:1185758482 .386552.83280@i 38g2000prf.goog legroups.com...
>
>
>

using System.Threadin g;

>

bool blnFirstInstanc e;

>

using (Mutex objMutex = new Mutex(false, "Local\\" + "<app name>", out
blnFirstInstanc e))
{
if (!blnFirstInsta nce)
{
MessageBox.Show ("<app nameis already running", "Single Use
Only", MessageBoxButto ns.OK, MessageBoxIcon. Stop);
Application.Exi t();
}
else
{
Application.Run (new Form1()); // or whatever your startup
is...
}
}

>

Great, thanks!

>

Is there any easier way like OnlyOneInstance = ture;

>
An easier way? The above is only a dozen lines of code...
>
Can't you get it to work, then...?
>
--
Mark Rae
ASP.NET MVPhttp://www.markrae.net

Sorry, in fact, I don't have try it yet.

If I recall correctly, there is a setting in VC6, when we assign so
many parameters to create a form. For this purpose, what we need to do
is assign a parameter as true only.

I believe your code can work, but I am just curious if there is any
other methods.

:)

Thanks!

Best regards,
Boki.

[Jon Skeet [C# MVP]]

Re: How to limit program can only run one instance.

On Jul 30, 8:15 am, Boki Digtal <bokit...@ms21. hinet.netwrote:

Sorry, in fact, I don't have try it yet.
>
If I recall correctly, there is a setting in VC6, when we assign so
many parameters to create a form. For this purpose, what we need to do
is assign a parameter as true only.
>
I believe your code can work, but I am just curious if there is any
other methods.

You could add a reference to the Microsoft.Visua lBasic assembly and
use the WindowsFormsApp licationBase class which I believe has this
sort of functionality. I don't know much about it, but it *might* make
things easier for you.

Jon

[Boki Digtal]

Re: How to limit program can only run one instance.

On 7 30 , 3 26 , "Jon Skeet [C# MVP]" <sk...@pobox.co mwrote:

On Jul 30, 8:15 am, Boki Digtal <bokit...@ms21. hinet.netwrote:
>

Sorry, in fact, I don't have try it yet.

>

If I recall correctly, there is a setting in VC6, when we assign so
many parameters to create a form. For this purpose, what we need to do
is assign a parameter as true only.

>

I believe your code can work, but I am just curious if there is any
other methods.

>
You could add a reference to the Microsoft.Visua lBasic assembly and
use the WindowsFormsApp licationBase class which I believe has this
sort of functionality. I don't know much about it, but it *might* make
things easier for you.
>
Jon

visual basic ... ? but I am using c# ...

Boki.

[Mark Rae [MVP]]

Re: How to limit program can only run one instance.

"Boki Digtal" <bokiteam@ms21. hinet.netwrote in message
news:1185781978 .832708.291660@ j4g2000prf.goog legroups.com...

On 7 30 , 3 26 , "Jon Skeet [C# MVP]" <sk...@pobox.co mwrote:

>On Jul 30, 8:15 am, Boki Digtal <bokit...@ms21. hinet.netwrote:
>>

Sorry, in fact, I don't have try it yet.

>>

If I recall correctly, there is a setting in VC6, when we assign so
many parameters to create a form. For this purpose, what we need to do
is assign a parameter as true only.

>>

I believe your code can work, but I am just curious if there is any
other methods.

>>
>You could add a reference to the Microsoft.Visua lBasic assembly and
>use the WindowsFormsApp licationBase class which I believe has this
>sort of functionality. I don't know much about it, but it *might* make
>things easier for you.
>>
>Jon

>
visual basic ... ? but I am using c# ...

Yes, but you can set a reference to the Microsoft.Visua lBasic assembly and
use the (without wishing to get into a language war) "hand-holding"
functions ported over from VB6 if the code I suggested (which I pretty much
nicked from Jon anyway) is too much for you...


--
Mark Rae
ASP.NET MVP

http://www.markrae.net

[Boki Digtal]

Re: How to limit program can only run one instance.

On 7 30 , 4 18 , "Mark Rae [MVP]" <m...@markNOSPA Mrae.netwrote:

"Boki Digtal" <bokit...@ms21. hinet.netwrote in message
>
news:1185781978 .832708.291660@ j4g2000prf.goog legroups.com...
>
>
>

On 7 30 , 3 26 , "Jon Skeet [C# MVP]" <sk...@pobox.co mwrote:

On Jul 30, 8:15 am, Boki Digtal <bokit...@ms21. hinet.netwrote:

>

Sorry, in fact, I don't have try it yet.

>

If I recall correctly, there is a setting in VC6, when we assign so
many parameters to create a form. For this purpose, what we need to do
is assign a parameter as true only.

>

I believe your code can work, but I am just curious if there is any
other methods.

>

You could add a reference to the Microsoft.Visua lBasic assembly and
use the WindowsFormsApp licationBase class which I believe has this
sort of functionality. I don't know much about it, but it *might* make
things easier for you.

>

Jon

>

visual basic ... ? but I am using c# ...

>
Yes, but you can set a reference to the Microsoft.Visua lBasic assembly and
use the (without wishing to get into a language war) "hand-holding"
functions ported over from VB6 if the code I suggested (which I pretty much
nicked from Jon anyway) is too much for you...
>
--
Mark Rae
ASP.NET MVPhttp://www.markrae.net

OK, got it, thanks :)

Boki.

[Ivica Muruzovic]

Re: How to limit program can only run one instance.

Try this

using System;
using System.Windows. Forms;
using System.Runtime. InteropServices ;
using System.Text;
using System.Diagnost ics;
using System.Threadin g;
using System.Reflecti on;
using System.IO;

namespace SingleInstance
{
/// <summary>
/// Summary description for SingleApp.
/// </summary>
public class SingleApplicati on
{
public SingleApplicati on()
{

}
/// <summary>
/// Imports
/// </summary>

[DllImport("user 32.dll")]
private static extern int ShowWindow(IntP tr hWnd, int
nCmdShow);

[DllImport("user 32.dll")]
private static extern int SetForegroundWi ndow(IntPtr
hWnd);

[DllImport("user 32.dll")]
private static extern int IsIconic(IntPtr hWnd);

/// <summary>
/// GetCurrentInsta nceWindowHandle
/// </summary>
/// <returns></returns>
private static IntPtr GetCurrentInsta nceWindowHandle ()
{
IntPtr hWnd = IntPtr.Zero;
Process process = Process.GetCurr entProcess();
Process[] processes =
Process.GetProc essesByName(pro cess.ProcessNam e);
foreach(Process _process in processes)
{
// Get the first instance that is not
this instance, has the
// same process name and was started
from the same file name
// and location. Also check that the
process has a valid
// window handle in this session to
filter out other user's
// processes.
if (_process.Id != process.Id &&
_process.MainMo dule.FileName
== process.MainMod ule.FileName &&
_process.MainWi ndowHandle !=
IntPtr.Zero)
{
hWnd =
_process.MainWi ndowHandle;
break;
}
}
return hWnd;
}
/// <summary>
/// SwitchToCurrent Instance
/// </summary>
private static void SwitchToCurrent Instance()
{
IntPtr hWnd =
GetCurrentInsta nceWindowHandle ();
if (hWnd != IntPtr.Zero)
{
// Restore window if minimised. Do not
restore if already in
// normal or maximised window state,
since we don't want to
// change the current state of the
window.
if (IsIconic(hWnd) != 0)
{
ShowWindow(hWnd , SW_RESTORE);
}

// Set foreground window.
SetForegroundWi ndow(hWnd);
}
}

/// <summary>
/// Execute a form base application if another
instance already running on
/// the system activate previous one
/// </summary>
/// <param name="frmMain"> main form</param>
/// <returns>true if no previous instance is
running</returns>
public static bool Run(System.Wind ows.Forms.Form
frmMain)
{
if(IsAlreadyRun ning())
{
//set focus on previously running app
SwitchToCurrent Instance();
return false;
}
Application.Run (frmMain);
return true;
}

/// <summary>
/// for console base application
/// </summary>
/// <returns></returns>
public static bool Run()
{
if(IsAlreadyRun ning())
{
return false;
}
return true;
}

/// <summary>
/// check if given exe alread running or not
/// </summary>
/// <returns>return s true if already running</returns>
private static bool IsAlreadyRunnin g()
{
string strLoc =
Assembly.GetExe cutingAssembly( ).Location;
FileSystemInfo fileInfo = new
FileInfo(strLoc );
string sExeName = fileInfo.Name;
bool bCreatedNew;

mutex = new Mutex(true, "Global\\"+sExe Name,
out bCreatedNew);
if (bCreatedNew)
mutex.ReleaseMu tex();

return !bCreatedNew;
}

static Mutex mutex;
const int SW_RESTORE = 9;
}
}

IN PROGRAM.CS add line
SingleApplicati on.Run(new frmMain());


On Mon, 30 Jul 2007 01:29:28 -0700, Boki Digtal
<bokiteam@ms21. hinet.netwrote:

>On 7 30 , 4 18 , "Mark Rae [MVP]" <m...@markNOSPA Mrae.netwrote:

>"Boki Digtal" <bokit...@ms21. hinet.netwrote in message
>>
>news:118578197 8.832708.291660 @j4g2000prf.goo glegroups.com.. .
>>
>>
>>

On 7 30 , 3 26 , "Jon Skeet [C# MVP]" <sk...@pobox.co mwrote:
>On Jul 30, 8:15 am, Boki Digtal <bokit...@ms21. hinet.netwrote:

>>

Sorry, in fact, I don't have try it yet.

>>

If I recall correctly, there is a setting in VC6, when we assign so
many parameters to create a form. For this purpose, what we need to do
is assign a parameter as true only.

>>

I believe your code can work, but I am just curious if there is any
other methods.

>>

>You could add a reference to the Microsoft.Visua lBasic assembly and
>use the WindowsFormsApp licationBase class which I believe has this
>sort of functionality. I don't know much about it, but it *might* make
>things easier for you.

>>

>Jon

>>

visual basic ... ? but I am using c# ...

>>
>Yes, but you can set a reference to the Microsoft.Visua lBasic assembly and
>use the (without wishing to get into a language war) "hand-holding"
>functions ported over from VB6 if the code I suggested (which I pretty much
>nicked from Jon anyway) is too much for you...
>>
>--
>Mark Rae
>ASP.NET MVPhttp://www.markrae.net

>
>OK, got it, thanks :)
>
>Boki.

[Mark Rae [MVP]]

Re: How to limit program can only run one instance.

"Ivica Muruzovic" <kvin@eunet.yuw rote in message
news:aikta3li95 78vr8f2s2elrra4 3g1h100v0@4ax.c om...

using System.Runtime. InteropServices ;
[DllImport("user 32.dll")]

There really is no need to use WinAPI for this...


--
Mark Rae
ASP.NET MVP

http://www.markrae.net

[Boki]

Re: How to limit program can only run one instance.

On 7 23 , 6 11 , "Mark Rae [MVP]" <m...@markNOSPA Mrae.netwrote:

"Boki Digtal" <bokit...@ms21. hinet.netwrote in messagenews:118 5184038.720113. 13850@x35g2000p rf.googlegroups .com...

How to limit the c# program can only run one instance at the same
time ?

>
using System.Threadin g;
>
bool blnFirstInstanc e;
>
using (Mutex objMutex = new Mutex(false, "Local\\" + "<app name>", out blnFirstInstanc e))
{
if (!blnFirstInsta nce)
{
MessageBox.Show ("<app nameis already running", "Single Use Only", MessageBoxButto ns.OK, MessageBoxIcon. Stop);
Application.Exi t();
}
else
{
Application.Run (new Form1()); // or whatever your startup is...
}
>
}
>
--
Mark Rae
ASP.NET MVPhttp://www.markrae.net

Hi,
Please see my complete "Program.cs " below:
After I did this, it can still run more than one instance.

/////////////////////////////////////////////////
using System;
using System.Collecti ons.Generic;
using System.Windows. Forms;
using System.Threadin g;

namespace Ring_Buffer_Tes t
{

static class Program
{
/// <summary>
/// The main entry point for the application.
/// </summary>
[STAThread]
static void Main()
{

bool blnFirstInstanc e;
using (Mutex objMutex = new Mutex(false,"Lo cal\\" +
"BokiTestin g", out blnFirstInstanc e))

Application.Ena bleVisualStyles ();
Application.Set CompatibleTextR enderingDefault (false);


if (!blnFirstInsta nce)
{
MessageBox.Show ("<app nameis already running", "Single
Use Only", MessageBoxButto ns.OK, MessageBoxIcon. Stop);
Application.Exi t();
}
else
{
Application.Run (new Form1());
}

}
}
}
////////////////


I don't know why ...

Boki.

[Jon Skeet [C# MVP]]

Re: How to limit program can only run one instance.

Boki <boki.digital@g mail.comwrote:

Please see my complete "Program.cs " below:
After I did this, it can still run more than one instance.

Yes, because your "using" statement for the mutex doesn't have braces
round the code. You've effectively got:

bool blnFirstInstanc e;

using (Mutex objMutex = new Mutex(false,"Lo cal\\" + "BokiTestin g",
out blnFirstInstanc e))
{
Application.Ena bleVisualStyles ();
}

Application.Set CompatibleTextR enderingDefault (false);

// Rest of code...

The idea is to hold the mutex for the whole of the time your app is
running.

--
Jon Skeet - <skeet@pobox.co m>
http://www.pobox.com/~skeet Blog: http://www.msmvps.com/jon.skeet
If replying to the group, please do not mail me too

[Boki]

Re: How to limit program can only run one instance.

On 8 2 , 2 22 , Jon Skeet [C# MVP] <sk...@pobox.co mwrote:

Boki <boki.digi...@g mail.comwrote:

Please see my complete "Program.cs " below:
After I did this, it can still run more than one instance.

>
Yes, because your "using" statement for the mutex doesn't have braces
round the code. You've effectively got:
>
bool blnFirstInstanc e;
>
using (Mutex objMutex = new Mutex(false,"Lo cal\\" + "BokiTestin g",
out blnFirstInstanc e))
{
Application.Ena bleVisualStyles ();
>
}
>
Application.Set CompatibleTextR enderingDefault (false);
>
// Rest of code...
>
The idea is to hold the mutex for the whole of the time your app is
running.
>
--
Jon Skeet - <sk...@pobox.co m>http://www.pobox.com/~skeet Blog:http://www.msmvps.com/jon.skeet
If replying to the group, please do not mail me too

Yes, you are right, thanks!

Boki.