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Visual Basic 2008 - not this EXE please

Posted on 2011-09-29
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Last Modified: 2012-05-12
I have a project that is started by running EPDLauncher.exe  The EPDLauncher's job is to look to see if there are any updates to all the EXE's and DLL's of the project.  If so, they are copied to the local machine, and then EPD.exe is executed and the program begins.
Sometimes the client sets up a shortcut that starts EPD.exe instead of EPDLauncher.  This works until there is an update[s] that never get copied to the PC because EPDLauncher is never run again.
What would be the required logic to determine if EPD.exe is started on its own or started by EPDLauncher.  I would like to tell the user via a message box: "you have started EPD.exe directly instead of EPDLauncher so no updates have been applied"
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Question by:dastaub
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Expert Comment

by:Luis Pérez
ID: 36815816
You can do it easily communicating the two processes using Atoms. Read my article about that, you'll see that is extremely useful and easy:

http://www.experts-exchange.com/Programming/Languages/.NET/Visual_Basic.NET/A_233-Inter-communicate-applications-with-Atoms.html

The idea is that launcher stores an Atom (something like saying "I've started you") that is deleted from main exe when started. If main exe doesn't found that atom, you can apply the program logic that you want.

Hope that helps.
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nffvrxqgrcfqvvc earned 500 total points
ID: 36816182
In your EPDLauncher you want to create  named Mutex. Then in your EPD application you want to check if the named Mutex already exists. If the Mutex doesn't exist then EPDLauncher wasn't started and EPD.EXE was run directly.
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Author Comment

by:dastaub
ID: 36816448
In your EPDLauncher you want to create  named Mutex. Then in your EPD application you want to check if the named Mutex already exists. If the Mutex doesn't exist then EPDLauncher wasn't started and EPD.EXE was run directly.

Sounds simple, but how do you create Mutex and then check to see if Mutex exists.  What is Mutex?
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