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How to prevent multiple instances of an application in c++?
TLDR: The only safe and general way to prevent multiple instances of the same process is to use a mutex, since only this is guaranted to not give you a race condition.
How do I run a second instance of a program?
To open another window of a program, simply launch it again. An easier way to do this is to press and hold the Shift key and click on the program’s icon in the taskbar. If the program allows multiple windows, then another instance will open up without a hinge.
How do I open a second instance of a program in Windows 10?
First, open the application you want to run in multiple instances. Then, hold down the Shift key on your keyboard and click with your cursor – or tap with your finger – on its taskbar icon. One click or tap opens a new instance, two clicks or taps open two, and so on.
How do you check if a process is running in Windows C++?
You can check whether the exit code is STILL_ACTIVE and if so, you can call WaitForSingleObject(processHandle, 0) and check whether the return value is WAIT_TIMEOUT . If so, the process is still active, otherwise the process has returned 259 as exit code.
How to prevent multiple instances from desktop shortcut?
Again i am writing on the above issue (Preventing multiple instances of my application) the code works for if i start two instances from programe menu/desktop shortcut. but in my envrironment, one instance is running from Window Service. another from Desktop shortcut with Same parameter.
Is there a way to prevent multiple instances of the same process?
If you want a really thorough solution and why the above ways are no good, check this link on Codeproject. TLDR: The only safe and general way to prevent multiple instances of the same process is to use a mutex, since only this is guaranted to not give you a race condition.
Is it possible to have multiple instances of an application?
He points out that it is possible to use API calls such as LogonUser, CreateProcessAsUser, CreateDesktop and SwitchDesktop, and therefore it is possible to have multiple users and multiple desktop sessions running under different accounts. Therefore, there are several issues about why one would not want multiple instances of an application.
How to convert an executable to a single instance application?
Using Visual Studio 2005 or 2008 when you create a project for an executable, on the properties windows inside the “Application” panel there is a check box named “Make single instance application” that you can activate to convert the application on a single instance application.