Catching "swap file exists" and dealing with it in code

Windows 32bit Vim 7.4.1-729

My work flow is this.

Have gVim open, editing a file.

Flip over to my revision system (Perforce) and do a diff on the file to have a look at the changes I have made with what is currently in the repository.

P4 just launches gvim -O -d %1 %2.

I am writing my own plugin to do something different like this instead:

gvim --servername gDiff +"RemoteDiffFiles '%1', '%2'"

If the file I choose to diff, so happens to be open in my usual editing Vim instance then Vim rightly displays the popup, indicating the .swp file exists and what I would like to do ... Open Read-Only, Delete it, Quit,...

What I want to be able to do is catch this message and deal with it in my own code and show a message.  

Greping through the vim74 directory, "Open Read-Only" seems to be part of the Vim binary itself.  

I know I can wrap my :edit / :view command in a try catch, but assuming I manage to catch this condition, is there a Vim command I can use in VimScript to make one of those choices?  My Googling around didn't get me what I needed.

TIA,

David

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