Hi people of the list,
I put together an external this morning that you can use to limit your
application to one running instance on Windows. It uses a mutex object
on Windows which you can read about here:
<http://msdn.microsoft.com/library/default.asp?url=/library/en-us/
dllproc/base/using_mutex_objects.asp>
There is a readme with the archive but basically there are two handlers
you use:
get ewinRegisterApp("My_App_Unique_String")
ewinUnregisterApp
You can ewinRegisterApp("My_App_Unique_String") when your app first
launches. If it returns true then there is only one instance of your
app running. If it returns false then another app has registered the
same string (in this case "My_App_Unique_String") and you should quit.
When you quit your app you call ewinUnregisterApp to release the mutex
object you created with ewinRegisterApp().
Now you may be asking yourself what would happen if your app crashes.
Would ewinRegisterApp() still return false? The answer is no, it would
return true. Windows knows that the app that created the original
mutex object has gone the way of all misbehaved software and it will
gladly give you control of the orphaned mutex object.
Anyway, I've tested this on Win XP so far and it seems to be working
nicely. Note that for every time you call ewinRegisterApp() in one app
you need to call ewinUnregisterApp in order for another app to be able
to have ewinRegisterApp() return true. I may fix that, I may not. It
doesn't really bother me.
Anyway, you can download it at:
<http://www.mangomultimedia.com/download/revolution/enhancedwin/
EnhancedWin.zip>
There is also a command called ewinOpenURL in the external that will
always do the right thing when trying to open a url or launch an email
client on Windows. You may find that useful as well.
If you have any questions or problems let me know. If you want the
source code you can have that too. It was compiled with Visual C++
.Net.
--
Trevor DeVore
Blue Mango Multimedia
[EMAIL PROTECTED]
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