I use this code but it doesnt seems to work...
If Process.GetProcessesByName(My.Application.Info.ProductName).Length > 1 Then
MsgBox("Program already running!.")
End If
EDIT: ShowInTaskBar = False
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 Repliesassume that i have two forms(form1 and form2)form1 code
Imports System.IO
Public Class Form1
Inherits System.Windows.Forms.Form
[Code]....
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 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.
[Code]...
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?
creating single instance form in MDI Application. How to check whether form's instance created or not?
View 6 RepliesI'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 RepliesMy problem is when i try to call Application.Run() in a application without a form i get "Object reference not set to an instance of an object." when i run it outside VS. but if ran in debug or release mode it works just fine. i may just be forgetting to setup application right, but ive done it before in this same manor and it worked fine.
Sub main() 'this runs first.
AddHandler Application.ApplicationExit, AddressOf ExitEventHandler
dbg_f("handle added")
[CODE]...
Commented out init_timer and init_ready, and now it causes the same error for the myName line. there seems to be something wrong with class Application. btw theres seems to be something wrong with the forum code formatting.
I have a class "Character" that holds character stats and skills. I make a new instance of it "MyCharacter". The problem is I would like to use it like this.
MyCharacter.stat.charactername ="whatever"
Where stat is another class within Character or
MyCharacter.skill.lockpick=10, b
But I can't seem to do it.
(I think) but I wish to make every single instance of whatever is in TextBox3.text to be bold within RichTextBox1.text.
I have the following code:
Code:
RichTextBox1.SelectionStart = RichTextBox1.Find(TextBox3.Text)
Dim bfont As New Font(RichTextBox1.Font, FontStyle.Bold)
RichTextBox1.SelectionFont = bfont
Do I need to loop it? If so, how? I've already tried with a standard for loop with an infinite counter, but it doesn't increase (doesn't search) past the first bold instance found.
Is there any way to make a class instance public?In my mainform I define an instance of a certain class and then later on in some other forms which appear I want to alter this class.I try and pass them through when creating new instances of these other forms and it tells me Error3<instance of the class I want> cannot expose type <the class> outside the project through class <the form I want to edit it with>Which I gather from documentation is about it defeating the purpose to have a private class suddenly be thrown aroudn.but then how do I make it public? I can't define it in the first place as public myXClass as XClass, it only accepts private.
View 6 RepliesIn this chunk of a code, the writer makes a reference to a recordset object and I just wanted to make sure I understood why before moving on. [code]...
In LoadDataBound, it says set rs = GetData(). This calls to the Function below, but why does it require to be set as an object of the rs recordset. Correct me here, because i'm most likely wrong, but does it require this so that you're able to make a function out of the recordset without having to use the same name for both (recordset and function) ? Or is there another process going on here that i'm unaware of.
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.
I can cheack another instance running r not then i closed the newly created instance
but nw my problem is i need to show the previously running instance if the previous instance minimized or hided
i m using the foolowing code to find the previous instance[code]...
given a MDIParent Form and 2 MDI Children: frmChild1, frmChild2..How can i realize a Instance of MyClass in MDIParent, which I can read and write from frmChild1 and frmChild2 , too
View 4 RepliesI am having a text file in this path "C:Test est.txt" when this was openeed I need to close this.
When I am trying to use the below code all the instances of notepad are closing and I don't want that to be happened and I want to close only the ".txt" file:Here is my code:
Dim Process() As Process = System.Diagnostics.Process.GetProcessesByName("notepad")
For Each p As Process In Process
p.Kill()
Next
How could i make sure that only one instance of a child form is loaded in my application.
View 3 RepliesAll i want to do at the end of my sub is make it go to the next instance in the list
say if its on A (the first instance) i do my thing then it rolls to the next instance B and so on
I developing a windows application. i dont want to allow multiple instance of the application how i will achive that?
View 1 RepliesIs there any way of restarting a single instance application, which is deployed via clickonce?
View 1 RepliesI am creating a Windows application using VS 2008. This has a MDI Parent form that hosts multiple MDI children forms. I have a login form that authenticates the user and creates an instance of a user class. This has information such as UserID, Name etc. I would like this instance available to other windows. How would I implement this functionality?
View 2 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 a class inside a class.I need to expose the properties of the 2nd class to other classes, therefore it is public.However, I do not wish other classes to be able to create instances of this 2nd class, it should only be instantitated from its parent class.I thought I could resolve this issue by making the constructor of the 2nd class private, but this even prevents the parent class from instantiating its child class! How can I work around this, do I have to make the constructor public and allow anybody to create an instance of the class?
View 3 Repliesthere is a way to turn the following code into a sub so I don't have the same boilerplate show form code in use a thousand times in a program:
Example:
Public InstanceOfFrmGeneric As frmGeneric
If InstanceOfFrmGeneric Is Nothing Then
InstanceOfFrmGeneric = New frmGeneric()
[code]....
In my VB .Net code, I am trying to create to launch MS Project Application. Dim prjApp As Microsoft.Office.Interop.MSProject.Application = New Microsoft.Office.Interop.MSProject.Application
But I am getting the exception as follows:
"Creating an instance of the COM component with CSSID {36D27C48-A1E8-11D3-BA55-00C04F72F325} from the
IClassFactory failed due to the following error: 80010001".Note: This exception happens in 64 bit Windows 7 German OS. But the same code runs successfully in 32 bit Win XP (German and English) and 64 bit Windows 7 English OS.I have even tried the following steps in German 64 bit Win 7
1. Running the application in Administrator mode
2. Setting UAC to low.
3. Re-installing MS Project in German 64 bit Win 7.
I want to learn the Database application programming. Especially, the multi-user environment. User can update the data at the same database. So, could you give me some advices ? Does it should use SQL server db ? How to connect with the the SQL server from other PC user ?
[Code]...
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 RepliesI'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? ...)
