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Questions tagged [single-instance]

Make sure that only one instance of the application is running on the system.

250 questions
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How to call a WCF singleton service within a WCF singleton service without hanging?

I have two services, one that calls another. Both are marked as singletons as follows: [ServiceBehavior(InstanceContextMode = InstanceContextMode.Single, ConcurrencyMode = ConcurrencyMode.Multiple)] public class Service : IService And I set…
Michael Hedgpeth
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maximizing the already running instance of a single instance app in qt

I have made an application to run only single instance using shared memory in qt.My code looks like this int main(int argc, char *argv[]) { QSharedMemory sharedMemory; sharedMemory.setKey("4da7b8a28a378e7fa9004e7a95cf257f"); …
Sourabh
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How to prevent my single instance application from getting focus

I have found several solutions for creating a single instance WinForms application. I am using C# and I currently have three working versions. But, each version is missing a feature I need. The program has to run only once, update it's view with…
user3407753
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1 answer

Notification popup doesn't run with single instance

I want to display notification pop up when user attempts to run application second time , So I create NotificationPop obj and call the method to display the dialog within my single instance class ,but , it doesn't display popup when application…
mussdroid
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Passing string between 2 C# application instances

I built a media player, that media player is associated with several media file types. Every time that a user opens a media file, I check if my player is open. I managed to prevent opening two instances but I want to pass the file path to the…
Yinon Eliraz
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Checking if a MainWindow already exists

I have a C#/WPF application that consists of a mainwindow and a system tray icon. I have configured App.xaml with ShutdownMode="OnExplicitShutdown" in order to keep the application running in the system tray upon closing the main window. In the…
user3342256
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Application call with arguments to already running instance via WCF and wait for string result

First of all: I do really know what Google is and, yes, there are several existing threads for this topic, but I just did not find what I am searching for. The situation might be complex and hopefully I won't forget to explain anything. I'll come to…
Juppi89
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Re-start shell script without creating a new process in Linux

I have a shell file which I execute then, at the end, I get the possibility to press ENTER and run it again. The problem is that each time I press ENTER a new process is created and after 20 or 30 rounds I get 30 PIDs that will finally mess up my…
ali
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Restrict application to one instance per shell session on Windows

There are a lot of solutions for restricting an application from running twice. Searching by process name, using a named mutex etc. But I all of these methods don't work if I want to restrict my application to the shell session. A user may have more…
Wienczny
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How do I "single-instance" an ASP.Net AJAX web portal?

I’ve been asked if we can optionally “single-instance” our web portal. See this post on Hanselman's blog for the same idea in a WinForms app. Suppose we have 2 shortcuts on the same client…
jshardy
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Single Instance at a Time and Single Operation Target

I am currently developing a visual c# application which shall run in background on the first instance "A" it was created. Now, I want that for the other time "B" the same application is run, the arguments in "B" be passed and processed in the…
jmadoremos
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when I double-click a program of Winform or Wpf twice

If I have a program of Winform or Wpf, for example A.exe, I double-click it,a window shows, and I hide it,then double-click A.exe again, how can I make the hiden window show again? summary for winform(1,4 and 5 are required) and Wpf(1,2 and 3 are…
Plantain Yao
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android how to bring singleInstance activity to foreground when lockscreen is active

My application uses a BroadcastReceiver for monitoring charger connection. When charger is connected the application started. The main activity defined as singleInstance. In the BroadcastReceiver i'm using…
eyal
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How to create single instance of application

I am working on NFC application. when i application already opened and i read the information from NFC tag then activity open which registered Intent-Filter and this opens a new instance of application which has already opened.How can i close…
Shivam saxena
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Python subprocess.call() spawning new process for every call

I am trying to send .mp4 files to an mp4 tagging application. My problem is that on Windows everytime I call subprocess.call() or subprocess.Popen() a new process is spawned. What I want is to open the file in the existing process if the process is…
hammus
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