On Jan 30, 2005, at 12:48 PM, Aaron Ballman wrote:
On Windows you use a mutex (see the Windows Functionality Library) to
detect that a mutex already exists (basically a flag saying "I'm
already running") and then hand it off to the other instance (that
I'm not sure how you do ....)
Sorta. You make a named mutex which is a system-wide object that any
application can access. You then obtain the mutex (much the same way
you would Enter a critical section or Signal a semaphore). If you
aren't able to obtain a lock on the mutex, then you know some other
instance of your application is running on the same machine. There's
no hand-off involved -- it's just another type of locking mechanism.
OK ...
Suppose that an instance of this app is already running and a second
instance is started to open another document.
If there's no hand off to get the first running instance to open that
document that the the new second instance should have the second simply
dies when it sees that there is already one running and the document is
not opened.
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