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--- AppleScript [2017/01/06 17:49]
JMichaelTX [Get and Set Variables] Revised per @Tome
+++ AppleScript [2019/03/28 14:41] (current)
JMichaelTX ADD tell block to first example.
@@ Line 1: / Line 1: @@
 ====== Using AppleScript to Get and Set Keyboard Maestro Variables ======
-\\
-===== Get and Set Variables =====
 Keyboard Maestro Version 7.1 introduced a streamlined way to Get and Set Keyboard Maestro Variables from AppleScript.
+In AppleScript, you can tell the application "Keyboard Maestro Engine" to:
+```applescript
+tell application "Keyboard Maestro Engine"
+    getvariable <KM Variable Name>
+    setvariable <KM Variable Name> to <New Value>
+end tell
+```
+where both the `<KM Variable Name>` and `<New Value>` are text values.
+**For more details, see:**
+  - [[manual:Scripting|Scripting article in the Manual Section]].
+  - [[action:Execute_an_AppleScript|Execute AppleScript Action]].
+===== Global Variables =====
+Global Variables (available in //all// macros) may be got and set like this:
 ```applescript
@@ Line 16: / Line 33: @@
   ### GET ###
   -- IF KM Variable does NOT exist, the AS Variable will be set to empty string --
+  -- Use Explicit Quoted Text --
+  set myASVar to getvariable "My KM Var Name"
+  -- OR, Use Previously Defined AppleScript Variables --
   set myASVar to getvariable myKMVar
   ### SET ###
   -- IF KM Variable does NOT exist, it will be created --
+  -- Use Explicit Quoted Text --
+  setvariable "My KM Var Name" to "A new value"
+  -- OR, Use Previously Defined AppleScript Variables --
   setvariable myKMVar to myASVar
@@ Line 25: / Line 52: @@
 ```
-==== Example ====
+**Real-World Example**
 Normally, you would not have both a GET and a SET variable within the same AppleScript tell block.\\
@@ Line 31: / Line 58: @@
 ```applescript
+### Requires Keyboard Maestro 7.1+ ###
 --- GET REQUIRED KM VARIABLES ---
@@ Line 48: / Line 77: @@
 ```
+===== Local & Instance Variables =====
-**For more details, see [[manual:Scripting|Scripting article in the Manual Section]].**
-----
+To get or set [[manual:Variables#Instance_Variables_v8|Local or Instance Variables]], you must pass the macro execution instance to the `getvariable` or `setvariable` command.  The instance is passed in to your script via the KMINSTANCE environment variable (v8.0.3+).
-===== Prior to Ver 7.1 =====
+  * //Local Variables// are denoted by a Variable with the prefix of "Local".
+  * //Instance Variables// are denoted by a Variable with the prefix of "Instance".
-  * All of the below scripts were designed for use with Keyboard Maestro prior to version 7.1, but they will still work with the latest version.
+```applescript
-  * They present an alternate method.
+### Requires Keyboard Maestro 8.0.3+ ###
-==== Create & Set Variable ====
+set kmInst to system attribute "KMINSTANCE"
+tell application "Keyboard Maestro Engine"
+	set kmLocalVar1 to getvariable "Local__SomeLocalVariable" instance kmInst
+	setvariable "Local__FromAS" instance kmInst to "Variable set in AppleScript."
+end tell
-```applescript
+log kmLocalVar1
---- Requires KM 7.0.2+ ---
+```
---- Set AppleScript Variables to KM Variable Name and Value ---
-set kmVarName to "My KM Var Name"
-set kmVarValue to "My data"
+===== Dictionary Values =====
+You can read and write [[manual:Dictionaries|Dictionary]] values from AppleScript.
+```applescript
+### Requires Keyboard Maestro 8.0+ ###
 tell application "Keyboard Maestro Engine"
-  if variable kmVarName exists then
+	set kmDictList to name of dictionaries
-    --- SET KM Variable ---
+	set dictKeyList to dictionary keys of dictionary "First Names"
-    set value of variable kmVarName to kmVarValue
-  else
+	set value of dictionary key "P" of dictionary "First Names" to "Fred"
-    --- Create & Set KM Variable ---
-    make new variable with properties {name:kmVarName, value:kmVarValue}
-  end if
 end tell
 ```
-==== Get Existing Variable ====
+===== Prior to Ver 7.1 =====
+  * All of the below scripts were designed for use with Keyboard Maestro prior to version 7.1, but they will still work with the latest version.
+  * They present an alternate method.
+==== Set Variable ====
+(will be created if necessary)
 ```applescript
---- Requires KM 7.0.2+ ---
+my setKMVar("MY_KM_Variable", "some new value")
---- Set AppleScript Variables to KM Variable Name and Value ---
+on setKMVar(pKMVarNameStr, pValueStr)
-set kmVarName to "My KM Var Name"
-set kmVarValue to "TBD" -- default value of KM variable, will be updated
+  --- Compatible with Keyboard Maestro 6+ ---
+  --     • Creates the KM Variable if does not exist (just like KM 7 setvariable)
+  --     • Returns true if new Variable was created
+  set varCreatedBool to false
+  tell application "Keyboard Maestro Engine"
+    try
+      set value of variable pKMVarNameStr to pValueStr
+    on error errMsg number errNum
+      if (errNum = -10006) then --- KM Variable Does NOT Exist ---
+        --- Create & Set KM Variable ---
+        make new variable with properties {name:pKMVarNameStr, value:pValueStr}
+        set varCreatedBool to true
+      else
+        error ("Error " & errNum & ":  " & errMsg)
+      end if
+      -- END on error
+    end try
+  end tell
+  return varCreatedBool
+end setKMVar
+```
-tell application "Keyboard Maestro Engine"
-  if variable kmVarName exists then
+==== Get Variable ====
-    --- GET Existing KM Variable ---
+(returns empty string "" if Variable does //not// exist)
-    set kmVarValue to value of variable kmVarName
-  else
+```applescript
-    --- KM Variable NOT Found ---
-    set kmVarValue to ""
+set myKMVar to my getKMVar("MY_KM_Variable")
-    -- Optionally, throw an AppleScript error --
-    error "[ERROR] KM Variable '" & kmVarName & "' was NOT found."
+on getKMVar(pKMVarNameStr)
-  end if
-end tell
+  --- Compatible with Keyboard Maestro 6+ ---
+  --     • Returns "" if variable is not found (just like KM 7 getvariable)
+  tell application "Keyboard Maestro Engine"
+    try
+      set kmVar to value of variable pKMVarNameStr
+    on error errMsg number errNum
+      if (errNum = -1728) then
+        --- KM Variable NOT Found ---
+        set kmVar to ""
+      else
+        error errMsg
+      end if
+      -- END on error
+    end try
+  end tell
+  return kmVar
+end getKMVar
 ```

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