I'm trying to get the current display resolution of both of my displays depending on where the mouse cursor is.

i.e. when the mouse cursor is on the first display I want to get the resolution of this display.

With a shell script I can get both resolutions:

set screenWidth to (do shell script "system_profiler SPDisp开发者_StackOverflow社区laysDataType | grep Resolution | awk '{print $2}'")

But I don't get which display is currently "active".

Any ideas?

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This does the trick:

tell application "Finder"
set screen_resolution to bounds of window of desktop
end tell

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Applescript does not have any access to cursor location, even via System Events. Sorry.

[There are a couple commercial solutions, but I'm guessing they're not worth the trouble in this case? I suppose I could also whip up a quick command-line tool that just returns the current cursor location... worth the trouble?]

p.s. awk is great at finding matching lines:

set screenWidth to (do shell script "system_profiler SPDisplaysDataType | awk '/Resolution/{print $2}'")

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For the sake of even more completeness, here is the code to get the width, height, and Retina scale of a specific display (main or built-in).

This is the code to get the resolution and Retina scale of the built-in display:

set {width, height, scale} to words of (do shell script "system_profiler SPDisplaysDataType | awk '/Built-In: Yes/{found=1} /Resolution/{width=$2; height=$4} /Retina/{scale=($2 == \"Yes\" ? 2 : 1)} /^ {8}[^ ]+/{if(found) {exit}; scale=1} END{printf \"%d %d %d\\n\", width, height, scale}'")

And this is the code to get the resolution and Retina scale of the main display:

set {width, height, scale} to words of (do shell script "system_profiler SPDisplaysDataType | awk '/Main Display: Yes/{found=1} /Resolution/{width=$2; height=$4} /Retina/{scale=($2 == \"Yes\" ? 2 : 1)} /^ {8}[^ ]+/{if(found) {exit}; scale=1} END{printf \"%d %d %d\\n\", width, height, scale}'")

The code is based on this post by Jessi Baughman and the other answers given here.

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The following does not solve the OP's problem, but may be helpful to those wanting to determine the resolution of ALL attached displays in AppleScript (thanks to @JoelReid and @iloveitaly for the building blocks):

set resolutions to {}
repeat with p in paragraphs of ¬
  (do shell script "system_profiler SPDisplaysDataType | awk '/Resolution:/{ printf \"%s %s\\n\", $2, $4 }'")
  set resolutions to resolutions & {{word 1 of p as number, word 2 of p as number}}
end repeat
# `resolutions` now contains a list of size lists;
# e.g., with 2 displays, something like {{2560, 1440}, {1920, 1200}}

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For the sake of completeness, here is the code to grab the screen height:

do shell script "system_profiler SPDisplaysDataType | awk '/Resolution/{print $4}'"}

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Multi-Monitor and Retina detection

To get the width, height and scaling (retina = 2, else = 1) for all monitors:

set resolutions to {}
repeat with p in paragraphs of ¬
    (do shell script "system_profiler SPDisplaysDataType | awk '/Resolution:/{ printf \"%s %s %s\\n\", $2, $4, ($5 == \"Retina\" ? 2 : 1) }'")
    set resolutions to resolutions & {{word 1 of p as number, word 2 of p as number, word 3 of p as number}}
end repeat

get resolutions

Based on answers above.

Results in something like this:

{{2304, 1440, 2}, {1920, 1080, 1}}

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On my machine system_profiler takes nearly a second to return a reply. For my purposes, that way too long.

Pre-10.12, I used ASObjC Runner but apparently that no longer works.

This is much faster for me:

tell application "Finder" to get bounds of window of desktop

(Taken from https://superuser.com/a/735330/64606)