Checking if the application is running in NSIS before uninstalling.

Question

I am new to NSIS, and I need to know that in the uninstaller, how I can check if the application (which is in C++) is running and close it before uninstalling.

Answer 1

Depending on the application, you have a couple of choices:

• If your application has a window with a somewhat unique class name, you could use FindWindow
• If your application creates a named kernel object (Mutex etc) you can check for it by calling the correct native win32 API with the system plugin
• Use a 3rd party plugin like FindProcDLL

Answer 2

Use the NsProcess plugin. Download it here -> http://nsis.sourceforge.net/NsProcess_plugin . How to use it? As simple as:

${nsProcess::KillProcess} "${APP_EXE}" $R4

where APP_EXE is the name of your application...

The download will also tell you how to use it... :)