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.
View 1 RepliesI 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 ?
View 1 RepliesI 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.
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?
View 3 Repliescreating single instance form in MDI Application. How to check whether form's instance created or not?
View 6 RepliesIf you mark your application using "Make Single Instance Application" option in the application settings tab and run your application under a GUEST account or a restricted limited/standard account the application throws UnAuthorizedAccessException or CantStartSingleInstanceException.
Take the following steps to reproduce this behavior.
1) Create Windows Form application.
2) Enable the "Make Single Instance Application" in the project properties.
3) Log onto a GUEST account and open the application twice to simulate StartUpNextInstance.
We need developers to reproduce this behavior and post any valuable input if you experience these symptoms.
When posting information please include the following:
a) The operating system version + service pack.
b) The .NET framework version used.
c) Verify this symptom is present when running under GUEST account.
To workaround this issue turn off the "Make Single Instance Application" option ad create a Local named mutex in the StartUp() event.
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I am writing a program in VB.net (vs 2008) that requires that only one instance of the executable be running at a time. Naturally I went for the simple solution by selecting the "Make single instance application" checkbox in the Project properties. Unfortunately, this option does not seem to work across multiple users that are logged into a single XP machine, thereby causing the same issues for my program as if I were able to run multiple instances on one single user. Granted this is a corner case, that someone would switch users while my program is running, but I'd like to understand the limitations. So my question is whether the "Make single instance application" property is supposed to work across multiple users? or is it limited to only one-instance-per-user.
Here are the steps the recreate the issue (prereqs: computer with XP pro installed, 2 user accounts (not on a Windows Domain), and a dummy "single instance" program created using the property mentioned above):
1) Log in with user1, start up the single instance program
2) Switch to user2 (StartMenu -> LogOff -> Switch User)
3) Start up the single instance program using user2
*After step 3, the program launches without complaint even though another instance is running on user1. Is this a glitch? or by design?
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.
View 8 RepliesI 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
View 1 RepliesI'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
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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.
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.
View 4 RepliesIs there any way of restarting a single instance application, which is deployed via clickonce?
View 1 RepliesIs 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?
View 3 Repliesi 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.
View 10 RepliesI have following instance of System.Collections.Specialized.NameValueCollection:
Dim UserSelection As New System.Collections.Specialized.NameValueCollection
UserSelection.Add("D_Color1", "Black")
UserSelection.Add("D_Color2", "Green")
UserSelection.Add("D_Color3", "Purple")
I need to save this instance to hard disk and then load it back from hard disk as an instance. How do I do that?
D is a dictionary whose entry values are of Type T..What I'm attempting to do is have a delegate like "Serializer" below that I can invoke on an instance of T, such as "Entry.Value" below.Please see the "return Entry..." line below for my wishful thinking.[code]
View 2 RepliesI 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?
View 1 RepliesA 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?
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? ...)
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.
View 2 RepliesI 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?
View 2 RepliesI 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
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).
View 2 RepliesI 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.
A while ago, I wrote a web-based guestbook application that wrote it's own database.
My code was very amateurish, but, as it was my very first publication, I was very happy with it. Only about a month after I'd published it did I realize I'd made a huge mistake in the code.
I've only ever connected to a specific named instance of SQL Server, and it occurred to me that, if the SQL Server instance has a different name than the one I specified, it wouldn't work.
So, since my users will probably not know what the name of the instance of SQL Server that's running is, I thought adding a field where the user can specify it would help if they do, but what if they don't? My answer was to get the local instance, regardless of name.
I tried Data Source=.local;, Data Source=.; and other variants, but nothing worked.
I was trying to fill 10 checkedlistboxes with items..So I made a sub with 2 arguments like this Private Sub fill_checkedlistboxes(ByVal items As String, ByVal checkedlistbox As CheckedListBox) End sub the first argument items is a long string whitch splits in the sub into many strings and added them all into the second arguments (thecheckedlistbox) I want to make for next statement to fill all the 10 checkedlistboxes in my form with an 10 long strings held in an array called strings, so i write something like this [code] What i have to write in the "?????" area to have the checkedlistbox that i want? the checkedlistboxes names are checkedlistbox 1, 2 , 3 ....10
View 12 RepliesI have no problem doing a select statement from a database and displaying it.An I have no problem inserting data into a sql database table. However with this issue I have to grab the data an insert it into a totally different SQL 2005 instance.
View 8 RepliesThe "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
View 2 RepliesI 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.
View 4 RepliesI have created a project that uses a listview associated to an imagelist (LargeImagelist, I have set the size as 100 x 75 and 32 bit depth), that displays information from a database along with an image from the image list. My listview is set to tilemode so that I can control the size of the tiles to get two columns of six. The image list is populated when the form is loaded from all the images in a specific folder, this part is working appropriately as I can get a picturebox working consistently that references an image from the imagelist.
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