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It shouldn't be, but the tell application block is a stumbling block, right at the start of drafting an applescript.

On my system, for example,
tell application "OmniFocus"
works, but
tell application "OmniOutliner"
fails, and so does
tell application "OmniGraffle"
Not only do you have to memorize some slightly arbitrary and inconsistent elaborations like:
tell application "OmniOutliner Professional"
tell application "OmniGraffle Professional 5"

but these references stop even very simple and general scripts from working across variants and versions of the same app (Professional versus vanilla, Ver. N versus Ver. N + 1)

Apple did introduce an improvement around OS X 10.5. Developers, they argued, are unlikely to change an application's 'bundle identifiers' and 'creator codes' across successive versions, whereas they do have a habit of changing its name, and so they introduced the format:
tell application id "com.omnigroup.OmniGrafflePro"
which looked promising because it didn't contain a version number.

And thus I personally generally switched to forms like:
tell application id "com.omnigroup.OmniFocus"
Which was fine, until I learned that the new AppStore versions have variant bundle names like com.omnigroup.OmniFocus.appstore and therefore choke on any applescript which starts with a line like the one above ...

So do we sigh and return to things like:
tell application "OmniGraffle Professional 5" ?
This makes sense if code is genuinely version-specific, but is frankly annoying in the numerous cases where the code for OmniOutliner and OmniOutliner Professional, or Omnigraffle vanilla, professional, or version whatever you like, would actually be identical ... (Two versions of OmniOutliner in the same office, professional and plain, and a need for a simple script which would run on both, for example).

This is why I am generally switching to a third application reference variant, which uses tell application id + creator code. Thus, for example:
tell application id "OOut"
for any version of OmniOutliner, and
tell application id "OGfl" for any version of OmniGraffle.
I have even adopted the reflex of
tell application id "sevs"
in place of
tell application "System Events"
All very well, but how do you learn and remember all these four-letter codes ?

Here is a script which will show you the four-letter creator codes (and the longer bundle identifiers) for all the applications currently running on your system. If you want, you can enter a search string, to filter down the list.

It will place a creator code (or bundle identifier) tell application block, for a selected application, in your clipboard.

(Ver .04 below should be compatible with LaunchBar and Keyboard Maestro. Tap space bar to pass a search string to it directly from LaunchBar).

Code:
-- Get creator codes and bundle identifiers for tell applications blocks
-- (for applications currently running
-- Ver .05 Compatible with LaunchBar - select script, tap space bar and enter string in Launchbar

property pTitle : "Tell application id ..."

property pDefaultSearch : "omni"

property pCodeCopy : "Copy creator code"
property pBundleCopy : "Copy bundle identifier"
property pNameCopy : "Copy app name"

-- System Events
on run
	tell application id "sevs"
		activate
		set strSearch to text returned of (display dialog "Enter part of application name:
	
(or leave blank to see all running applications)" default answer pDefaultSearch with title pTitle)
	end tell
	
	handle_string(strSearch)
end run

on handle_string(strSearch)
	tell application id "sevs"
		
		if (strSearch ≠ "") and (strSearch ≠ "*") then
			set {lstCode, lstBundle, lstFile} to {creator type, bundle identifier, file} of (application processes where name contains strSearch and bundle identifier is not missing value)
			set strPrompt to "Applications with \"" & strSearch & "\" in their name:"
		else
			set {lstCode, lstBundle, lstName, lstFile} to {creator type, bundle identifier, name, file} of (application processes where bundle identifier is not missing value)
			set strPrompt to "All currently running applications:"
		end if
		repeat with i from 1 to length of lstCode
			set varFile to item i of lstFile
			if varFile ≠ missing value then
				set strName to (name of item i of lstFile)
			else
				set strName to item i of lstName
			end if
			
			set item i of lstCode to item i of lstCode & "=" & item i of lstBundle & "=" & strName
		end repeat
		
		set my text item delimiters to linefeed
		set strApps to lstCode as string
		
		set lstApps to paragraphs of (do shell script "echo " & quoted form of strApps & " | sort -t '=' -k 3")
		if length of lstApps > 0 then
			set lstDefault to {first item of lstApps}
		else
			activate
			display alert "No running apps have names matching " & strSearch
			return
		end if
		activate
		set varChoice to choose from list lstApps with prompt strPrompt default items lstDefault with title pTitle
		
		if varChoice is false then return
		
		set my text item delimiters to "="
		set {strID, strBundle, strName} to text items 1 thru 3 of first item of varChoice
		
		set {blnCode, blnBundle, blnName} to {true, true, true}
		
		-- CREATOR CODE
		if strID ≠ "????" then
			set strCode to "tell application id \"" & strID & "\""
		else
			set blnCode to false
			set strCode to strName & " has no creator code ..."
		end if
		
		-- BUNDLE IDENTIFIER
		if strBundle ≠ "missing value" then
			set strBundle to "tell application id \"" & strBundle & "\""
		else
			set blnBundle to false
			set strBundle to strName & " has no bundle identifier"
		end if
		
		-- APPLICATION NAME
		if strName ends with ".app" then
			set strName to text 1 thru -5 of strName
			set strAppName to "tell application \"" & strName & "\""
		else
			set blnName to false
			set strAppName to ""
		end if
		
		
		set strChoice to "CREATOR CODE:    " & strCode & "

BUNDLE IDENTIFIER:    " & strBundle & "

APP NAME:    " & strAppName
		
		
		set lstBtns to {}
		if blnName then set end of lstBtns to pNameCopy
		if blnBundle then set end of lstBtns to pBundleCopy
		if blnCode then set end of lstBtns to pCodeCopy
		set lngButtons to length of lstBtns
		
		if lngButtons > 0 then
			set strClip to "-- " & strName & return
			activate
			set strBtn to (button returned of (display dialog strChoice buttons lstBtns default button lngButtons with title strName))
			if strBtn = pCodeCopy then
				set strClip to strClip & strCode
			else if strBtn = pBundleCopy then
				set strClip to strClip & strBundle
			else
				set strClip to strAppName
			end if
			set the clipboard to strClip & return & return & "end tell"
		else
			activate
			display alert strName & " is not a scriptable process"
		end if
		set my text item delimiters to space
	end tell
end handle_string

Last edited by RobTrew; 2011-05-28 at 12:19 AM.. Reason: Ver 0.3 - Will get its search string from LaunchBar