Make An Single Instance Form?
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.
View 2 Replies
ADVERTISEMENT
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.
View 1 Replies
Feb 8, 2012
creating single instance form in MDI Application. How to check whether form's instance created or not?
View 6 Replies
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?
View 3 Replies
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.
View 8 Replies
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
View 1 Replies
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 ?
View 1 Replies
Jun 29, 2010
If 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.
[Code]...
View 8 Replies
Jun 30, 2009
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?
View 2 Replies
Feb 10, 2009
assume that i have two forms(form1 and form2)form1 code
Imports System.IO
Public Class Form1
Inherits System.Windows.Forms.Form
[Code]....
View 5 Replies
Aug 31, 2010
How could i make sure that only one instance of a child form is loaded in my application.
View 3 Replies
Dec 10, 2009
I'm not sure if "Simpleton Technique" is the term used to call "opening a single instance of a form", so please, by all means, correct me if I'm wrong.I opened a child form using the simpleton technique. The situation is like this:
I have three forms (frmUserProfileManager, frmUserInfo, and frmUAC), and all are child forms of the MDI form, MDIMain.You first access frmUserProfileManager using the menu bar. It opens the form using the simpleton technique:
[Code]...
I think maybe it has something to do with the event (MDIMain_Load)? I feel as if the program is only making a child instance of the frmUserInfo once (since the program only loads MDIMain once). And after I close it (frmUserInfo), it loads outside the MDI. Another thing, how do you kill forms that were hidden using .hide()? Is .dispose() applicable?
View 12 Replies
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.
View 1 Replies
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.
View 4 Replies
Apr 13, 2009
Is there any way of restarting a single instance application, which is deployed via clickonce?
View 1 Replies
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?
View 3 Replies
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.
View 10 Replies
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?
View 1 Replies
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?
View 1 Replies
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? ...)
View 11 Replies
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.
View 2 Replies
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?
View 2 Replies
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
View 1 Replies
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).
View 2 Replies
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.
View 8 Replies
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
View 2 Replies
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.
View 4 Replies
Sep 7, 2009
I want to make a translator like this: [URL]...I have already made two textboxes and a button. If I type in textbox 1 abc then textbox 2 must say nop. I already know the If textbox1.text = "abc" then textbox2.text = nop. I don't want that i want to translate the a to a n and the b to a o and the c to p. So i want to translate every single letter and make it 1 word. Its like a secret code. My language looks like that a=nb=oc=pd=qe=rf=sg=th=ui=vj=wk=xl=ym=z n=ao=bp=cq=dr=es=ft=gu=hv=iw=jx=ky=l z=m
View 22 Replies
Mar 22, 2011
I have a few problems i need to solve. Firstly, I am looking for a piece of code i can use to display a picture from a bank of pictures. It will work on the basis of generating a random number and loading a picture that corresponds to that number.
i.e. Dim RandNumber As Integer
Dim RandClass As New Random
RandNumber = RandClass.next(1, 10)
If RandNumber = 1 Then
Picturebox1.image = picture1
[Code]...
Secondly, can I then use subsequent picture boxes to display pictures from the same bank of images, without displaying the same image? Finally, I then need to be able to click the picture or a button beneath the picture to select it as an answer to a question and then the whole process starts again.
View 1 Replies
Aug 26, 2009
I'm writing vb.net code with MS Visual Studio 2005.When running my application I get "foo.exe is already running on this machine".(Even though I'm running faa.exe instead
View 14 Replies
