How to check if more than one copy of app is installed

General
1

Hello,

Upon launch of my app, how can it check to see if more than one copy of that app is installed?

Thanks.

Lennox

2

per the Lang Ref

Add a property to your app:

mMutex As Mutex

In App.Open event handler, you can attempt to create a Mutex.

[code]
mMutex = New Mutex(“MutexExample”)

If Not mMutex.TryEnter Then
MsgBox(“You cannot have more than one copy of this app running!”)
mMutex = Nil
Quit
End If[/code]
In App.Close, you can release the Mutex:

If mMutex <> Nil Then
  mMutex.Leave
End If
3

Hi Dave, thanks, but that is not what I meant, I would like to know if another copy or more copies of my app is installed not running.

Sometimes, not intentionally, older versions may be located in unusual locations.

Lennox

4

for the most part an “installed” app that isn’t running is nothing more than a “file”.
The meaning of “installed” is ambiguous… the app may exist as a single file sitting alone in some folder/directory… it might be a program that is “registered” in some system database… it may be “installed” but have a name different that you expected…

5

OK, I see.
Thanks Dave.
Lennox