Have you tried checking for the open files for the process?
There are several ways of doing this (see: this article)
Normally the application binary will be an open file of the process.
Keep in mind that the binary executable may be contained in a package and you will need to look for it by doing a show package contents
in finder and then appending the path to the executable in the package. In the package check under /Contents/MacOs/
.
This might take a long time if you have many open processes and therefore not very practical to run often.
Also take into account that a single executable file can be running in more then one process instance.
A pity that the standard Activity Monitor is not scriptable with applescript which I just verified hoping for a more applescript friendly solution. You should still be able to achieve the same result via calling the shell command line.
Also often the process name is equal or similar to the filename but that depends on the application or process you're looking for.
I'm guessing you must have different versions of the same app installed that you need to check for the application by pathname?
Or if you don't need to figure out the path name dynamically you can simply look it up in advance using the Activity Monitor or on the command line. There you can identify the process name that corresponds to you your running application that was started from the specified path. Knowing the process name in advance then makes it easy and you can simply use
tell application "System Events" to get application process "Name of My Application"
--insert the actions you want to perform on your running app here
end tell
To solve any process uniqueness issues in case the same app is running more then once you can always result to the pid
or unix process Id. Here's an article on how to get the pid in applescript of a running app