AppleScript技术问题：如何从应用tell块内调用顶层处理器函数

Hey there, let's break down that -1708 error you're hitting. That code means AppleScript is trying to send the processCheck command directly to Slack, but Slack has no idea what that is—since it's a custom function you wrote for your script, not a command Slack understands.

The core issue here is a common AppleScript gotcha: when you're inside a tell application "Slack" block, any function call without a qualifier gets treated as a command to send to Slack, not a local function in your script.

Here's how to fix it: #

First, let's look at what your problematic code might have looked like (I'm guessing based on the error):

tell application "Slack"
    activate
    processCheck() -- Oops, Slack thinks this is a command it should execute
end tell

on processCheck()
    -- Your logic to check if Slack is fully loaded
    repeat until application "Slack" is running
        delay 0.5
    end repeat
end processCheck

Solution 1: Use the my keyword to call local functions inside tell blocks

If you need to run your processCheck while inside the Slack tell block, explicitly tell AppleScript it's a local function with my:

tell application "Slack"
    activate
    my processCheck() -- Now AppleScript knows this is your script's function, not Slack's command
end tell

on processCheck()
    repeat until application "Slack" is running
        delay 0.5
    end repeat
end processCheck

Solution 2: Move the function call outside the tell block (cleaner approach)

Even better, separate the app activation from your custom check logic to avoid confusion entirely:

-- First activate Slack
tell application "Slack"
    activate
end tell

-- Now run your local load check function
my processCheck()

on processCheck()
    -- Make this check more robust than just "running"
    repeat while (not application "Slack" is running) or (count windows of application "Slack" is 0)
        delay 0.5
    end repeat
    
    -- For extra assurance, check if a key UI element is loaded (like the message input box)
    tell application "System Events"
        tell process "Slack"
            repeat until exists text field "message-input" of window 1
                delay 0.5
            end repeat
        end tell
    end tell
end processCheck

Extra Tips: #

• Enable Accessibility Permissions: If you use System Events to check UI elements, make sure your script (or Script Editor) is added to System Preferences > Security & Privacy > Privacy > Accessibility—otherwise it won't be able to interact with Slack's UI.
• Tweak Delay Times: Adjust the delay 0.5 values based on your system speed—too short and you might check before elements load, too long and you'll waste time.

内容的提问来源于stack exchange，提问作者mheavers