.net - Single Instance Check Using Mutex?
Oct 26, 2011
I'm trying to implement single instance application using mutex.the application can run only one instance from a given directory.i tried to implement it in Applicationsevents class but it's not working.I replicated it with a test harness with a single form.my ApplicationEvents.vb code:
Private Sub SingleInstanceCheck(ByVal sender As Object, ByVal e As Microsoft.VisualBasic.ApplicationServices.StartupEventArgs) Handles Me.Startup
Dim strLoc As String = Assembly.GetExecutingAssembly().Location
[code]....
it runs multiple instances.Things I am not able change:
1.project setting has "Enable Application framework" ticked
2. ApplicationEvents.vb handles UnhandleException which means i cant have a module as startup.
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Feb 8, 2012
creating single instance form in MDI Application. How to check whether form's instance created or not?
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Dec 23, 2009
i've got a Set and a Get in a property. I want to allow multiple threads to do Get anytime they wish to, however if any thread tries to do Set, all threads must not be able to Get/Set until the Set is complete.[code]the problem is that this is pretty inefficient because each request to Get will steal the Mutex and prevent other Gets until the stolen Mutex is Released. Is there anyway to just check if a Mutex is released instead of using WaitOne because WaitOne checks and gains control of the Mutex which is not what i want
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Aug 30, 2011
I am looking for a way to make my app running in a single instance mode and showing the MainWindow of the first instance when another instance is launched.I do a quick search on the internet but I did'nt find anything to open the MainWindow of the first instance or it was for Windows Form not for WPF.
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Jul 15, 2011
I have a single instance VB 2010 application I know how to communicate with the next instances run through the StartupNextInstance application event. The usual way of working with this is parsing command line arguments of the new instance and continue execution of the old instance. What I would like to do is replace the running instance with the new one. Is there any way to do this other than disabling the single instance property ?
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Mar 15, 2007
I have windows application and a form. If I open a form named "DetailForm" from main form named "Main1" by clicking the button, it should open only once. The problem I am having is, it is opening many instance of the form every time you click the button.
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Jan 19, 2011
I then have an iteration (For Each loop) which lists all of the OUs on our site (set by the filter property). The issue here is within my treeview it lists everything without mimicing the AD structure we have.When searching on this it seems i have to change the search path to be one below the current OU and add it to my child node. I believe the search path is held in my RootDSE??, but when i look for the distinguishedName and try to pass that in i receive an
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Jan 7, 2011
I'm using the VB.NET WindowsFormsApplicationBase to create a single instance app.he first instance (of course) starts the app, while I use StartupNextInstance to handle commands passed to the application from the command lineAlmost all ofthe commands perform an action with no return value required.However, there are a few where I'd like to get a true/false return value.'m having a hard time getting the next instance to exit with a non-zero return code.I've tried setting the Environment.ExitCode inside the StartupNextInstance handler and also tried calling Environment.Exit(-1) but that just kills the first instance.ll the documentation I've read says after your code is executed in the StartupNextInstance handler, it just exits but it doesn't tell me how I can change the ExitCode of the 2nd instance that will be closed.
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Aug 4, 2010
I have a mdicontainer form that summons forms. My problem is when the a user clicks again the menu for that form, it also make another instance of it.
What I did is declare a public class with a public variable on it ex: Boolean isFormOneOpen = false. Then every time formOne opens, it checks first the global variable I declared a while ago if it's false, if it is, instantiate an object of a formOne and then show it. Otherwise, do nothing. Very static, imagine if I have many forms, I have to declare a variable for each form to check if it's already open. Maybe a method that accepts a Form? Or any more clever way to do this.
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Aug 25, 2009
in vb 2008 express this option is available under application properties. does anyone know what is its function? does it make it so that it's impossible to open two instances at the same time?
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Apr 13, 2009
Is there any way of restarting a single instance application, which is deployed via clickonce?
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Oct 16, 2010
Is it possible to compile my VB.NET project with a specific process name so that I can code to ensure that user cannot run multiple instance of the program?I have researched on the internet and found out most of them validate by process name. However, I have done a test which simply changing the exeuctable file to another name, the process name changes in the task manager as well. Thus, I don't think validating through process name works unless I can specifically assign a process name in the VB.NET project or validate through other ways?
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Jul 12, 2010
i am using "Animated Window Effects with "Toast" popup demo" code from the code bank created for jmcilhinney. I put a NotifyIcon control on it and check Make single instance application on the project properties windows. the problem is that every time that i launch the app it creates one instance on the system tray of the app. i can not figure out how to over come this attached is a copy of my project.
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Feb 17, 2012
I have a VB .NET application set as single instance. When I try to launch the application the second time its window is restored to its normal windowed state instead of being maximized (like it was before attempting the second launch). How can I make the application window to preserve its last state?
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Jan 3, 2012
A nice quick one I was wondering if anyone know the answer two (was shown a rough way to do this in vb6 but that was a long time ago)I have an application running in the system tray which I want as single instance (and currently have set as single instance)
However if someone double click on on the Desktop Icon or Startmenu Icon etc I want the main menu form to appear (frmMainMenu). Is it possible so that if opening the app when its already running triggers an invent in first instance rather than creating a new instance?
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Mar 14, 2011
I'm trying to build a single-instance application, but not in the traditional sence. Instead of a simple silent prevention of launching a second application, I want it to send a message to said application so it launches a second mainform in my original process.
(I want some read-only cache (language, style,...) shared, and a few sources like local settings shared, but other then that all resources reside in the mainforms and act as seperate applications.)
(I'm not looking for specific code, more for hints/tips and/or general directions, more specificaly on what parameters do you check process equality, and what method do you use to pass the message? Windows Messages? Sockets? ...)
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Jul 24, 2010
I have an application that has a tabcontrol to handle multiple documents, just like Notepad++. And I also have file association working correctly with it.All I want to do is to make it open the double-clicked file onto a new "codetab" instead of creating a new instance of the program just to open a file.
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Dec 13, 2008
I have set the "Make single instance application" check box.And when my application version is 1.0.0.0 for example, it is OK and won't load multiple instances.But when I create a new version, for example 1.0.0.1, then I can run 2 instances of my application, when the 1st instance is 1.0.0.0 and the second instance is 1.0.0.1.What should I do to prevent this?
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Aug 6, 2011
I use a single instance in my application. What if I give command line arguments to the exe of my program, so I can be selective in what was given command line in my program, but still single instance?
Example:
test.exe /show
When the command /show, then my program will
Form2.Show
Form2.BringToFront
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Mar 29, 2011
Has anyone using VB.NET 2010 been able to create a single instance application? I've followed the MSDN sample but it does not have an Application.xaml file. Converting any C# samples to VB doesn't work as I cannot override the Main sub in Application.xaml (C# calls it App.xaml).
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Jan 19, 2010
I have a single instance database app that emails out notifications. I would like to add a link in the emails that when clicked would open up the app and go to the section of the program that its supposed to go to. I implemented my own URL protocol so that links starting with my codewords get passed to my EXE. So far so good. I then parse the URL and pull the keyword and identifier out to open that section of the program. So if a user clicks a link like this:
MyApp:LoadCompany?ID=323
My application will start, it will grab the arguments (LoadCompany?ID=323), pass this to my load company routine and then load up company ID 323. Works great.
Now the issue is if the program is already open I still want the links to work but since it's a single instance app it just closes the second app. How can I add something ot the app to watch for this or receive a message from the second app? I know I will need to check status of what I'm doing and make sure things are saved, check security, etc but I can get all that done easily enough. I've found some examples online but none really did what I wanted them to.
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Oct 20, 2010
The "named pipe" seems rediculous to pass data between processes (exe's). Is it possible to run a single instance of a VB.NET Class Libary (dll) such that two programs can access the same memory resident dll, thereby passing data via functions and or subs?When I try to make the class library as single instance, the "Enable Application Framework" is greyed out, and thus the option to "Make Application Single Instance" is also greyed out.When I try to call the dll from two processes, I simply just create two instances, so storing data in a module doesn't work
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Dec 22, 2010
I wish to turn on the Single Instance Application choice in Visual Studio 2008 properties. To do so, I must choose "Enable Application Framework". When I do that, my ONLY choice is to choose a Startup Form, not a Startup object. This makes no sense to me. I have a tray application, and I check to see which form I should load, a logon form, or the main form. But since I am forced to choose a startup form, I MUST load the logon or main form to begin with. But I don't want to. I want startup code to determine which one to load first. So then I am playing with making the OTHER form invisible, even if the startup form, but that is a mess.
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Aug 10, 2011
My application is very very speed esential and even a microsecond matters.I am using semaphore(1,1) at varios places. I think it can be easily converted into mutex.But I want to know if it will be advantageous or its one and the same thing as far as speed is concerned.
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Nov 17, 2010
I have a mutex and threaded related question about = Run one or the other per call to routine
[Code]...
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May 4, 2011
Is there a way to do a read-only test of the blocking state of a mutex? Currently I use the return value of WaitOne(0,False). This works fine, provided that if the return is true, I also call ReleaseMutex. Failing to do this, my test would corrupt the state of the mutex. So, the test is effective, but it has the irritating side effect of two state changes in the mutex. In addition, WaitOne and ReleaseMutex can throw exceptions and that further complicates matters. If WaitOne is successful and returns true, and if ReleaseMutex throws an exception, I can't clean up the mess that I have made.
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May 10, 2011
I'm wanting to add a some extra code within my application. My app is a single form that sets some environment variables before calling a one of two possible 3rd party executables to run. I have set via regedit the file association for files to open via my app but what I want to do is have my app check to see if either 3rd party app is already running. In short I'm trying to ensure either 3rd party app stays as a single instance.
If a user were to try an open another instance: 1) my application should simply terminate (no warnings, no msg boxes etc...) 2)the file that the user was trying to open should open within the existing instance of the 3rd party application. The problem is I don't quite know how to achieve both parts I imagine that this 'instance check' should happen as the first bit of code so that if no instance of either 3rd party app is found, then proceed with rest of my application. I have tested using some lines of code at the top of Sub New(). Here's what I have so far for checking for both 3rd party applications:
Public Sub New()
If IsProcessRunning("ustation") = True Then
Me.Close()
[code]....
This gives me an error when I debug (Cannot access a disposed object)
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Mar 9, 2011
I have 11 asp.net checkboxes in my asp.net webusercontrol .. i want when checkbox1 is check thenrest of all checkboxes will be checked and if checkbox is uncheck then rest of all checkboxes will be unchecked how to do it if all my checkboxes are inside webusercontrol panel1.
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Feb 16, 2011
How to check the Single byte character (e.g. English) and Double bytes character(e.g. Chinese) ?
Since I want to printing out their code which are representing in Hex.
However, Single byte character is using 2 digits of Hex. And Double bytes character is using 4 digits of Hex.
So, how can I check them and output with more readable pattern ?
input likes: 微軟 Microsoft output likes: B74C B36E 4D 69 63 72 6F 73 6F 66 74
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May 16, 2011
My form contains a combobox which contains several usernames which are bound to my database.I've added a checkbox to the form which will be used to select the default username from the list.
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