Applescript Finder 选择“卡住”

Question

一段时间以来，我一直在使用下面的代码，通过我想要的各种壁纸尺寸自动缩小图像。今天早上，它停止了工作，并出现了一些我见过的最奇怪的行为。

如果我重新启动机器，脚本在第一次运行时会按预期工作。之后，之前的选择似乎卡在了 Image Events 内存中。我的意思是：

我有这个目录结构：

.
|-- 11
|   `-- Math.png
|-- 1610
|-- 169
|   `-- Math.png
|-- 43
|   `-- Math.png
|-- Math.jpg
`-- Math.png

我在重新启动后第一次运行脚本，并在 Finder 中选择了 ./169/Math.png，并在 Applescript 编辑器中得到以下结果：

tell application "Finder"
        get selection
                --> {document file "Math.png" of folder "169" of folder "test" of folder "Downloads" of folder "tim" of folder "Users" of startup disk}
        get document file "Math.png" of folder "169" of folder "test" of folder "Downloads" of folder "tim" of folder "Users" of startup disk
                --> alias "Paul:Users:tim:Downloads:test:169:Math.png"
end tell
tell application "Image Events"
        open alias "Paul:Users:tim:Downloads:test:169:Math.png"
                --> image "Math.png"
        get dimensions of image "Math.png"
                --> {2560, 1440}
        scale image "Math.png" to size 1920
        get name of image "Math.png"
                --> "Math.png"
        get name of image "Math.png"
                --> "Math.png"
        offset of "." in "Math.png"
                --> error number -1708
        «event ascrgdut»
                --> error number -1708
        offset of "." in "Math.png"
                --> error number -10004
end tell
tell current application
        offset of "." in "Math.png"
                --> 5
end tell
tell application "Finder"
        get parent of document file "Math.png" of folder "169" of folder "test" of folder "Downloads" of folder "tim" of folder "Users" of startup disk
                --> alias "Paul:Users:tim:Downloads:test:169:"
end tell
tell application "Image Events"
        save image "Math.png" in "/Users/tim/Downloads/test/169/Math_1920x1080.png" as PNG
                --> file "Paul:Users:tim:Downloads:test:169:Math_1920x1080.png"
        scale image "Math.png" to size 1366
        get name of image "Math.png"
                --> "Math.png"
        get name of image "Math.png"
                --> "Math.png"
        offset of "." in "Math.png"
                --> error number -10004
end tell
tell current application
        offset of "." in "Math.png"
                --> 5
end tell
tell application "Finder"
        get parent of document file "Math.png" of folder "169" of folder "test" of folder "Downloads" of folder "tim" of folder "Users" of startup disk
                --> alias "Paul:Users:tim:Downloads:test:169:"
end tell
tell application "Image Events"
        save image "Math.png" in "/Users/tim/Downloads/test/169/Math_1366x768.png" as PNG
                --> file "Paul:Users:tim:Downloads:test:169:Math_1366x768.png"
end tell
Result:
file "Paul:Users:tim:Downloads:test:169:Math_1366x768.png" of application "Image Events"
tell application "Finder"
        get selection
                --> {document file "Math.png" of folder "169" of folder "test" of folder "Downloads" of folder "tim" of folder "Users" of startup disk}
        get document file "Math.png" of folder "169" of folder "test" of folder "Downloads" of folder "tim" of folder "Users" of startup disk
                --> alias "Paul:Users:tim:Downloads:test:169:Math.png"
end tell
tell application "Image Events"
        open alias "Paul:Users:tim:Downloads:test:169:Math.png"
                --> image "Math.png"
        get dimensions of image "Math.png"
                --> {2560, 1440}
        scale image "Math.png" to size 1920
        get name of image "Math.png"
                --> "Math.png"
        get name of image "Math.png"
                --> "Math.png"
        offset of "." in "Math.png"
                --> error number -1708
        «event ascrgdut»
                --> error number -1708
        offset of "." in "Math.png"
                --> error number -10004
end tell
tell current application
        offset of "." in "Math.png"
                --> 5
end tell
tell application "Finder"
        get parent of document file "Math.png" of folder "169" of folder "test" of folder "Downloads" of folder "tim" of folder "Users" of startup disk
                --> alias "Paul:Users:tim:Downloads:test:169:"
end tell
tell application "Image Events"
        save image "Math.png" in "/Users/tim/Downloads/test/169/Math_1920x1080.png" as PNG
                --> file "Paul:Users:tim:Downloads:test:169:Math_1920x1080.png"
        scale image "Math.png" to size 1366
        get name of image "Math.png"
                --> "Math.png"
        get name of image "Math.png"
                --> "Math.png"
        offset of "." in "Math.png"
                --> error number -10004
end tell
tell current application
        offset of "." in "Math.png"
                --> 5
end tell
tell application "Finder"
        get parent of document file "Math.png" of folder "169" of folder "test" of folder "Downloads" of folder "tim" of folder "Users" of startup disk
                --> alias "Paul:Users:tim:Downloads:test:169:"
end tell
tell application "Image Events"
        save image "Math.png" in "/Users/tim/Downloads/test/169/Math_1366x768.png" as PNG
                --> file "Paul:Users:tim:Downloads:test:169:Math_1366x768.png"
end tell
Result:
file "Paul:Users:tim:Downloads:test:169:Math_1366x768.png" of application "Image Events"
tell application "Finder"
        get selection
                --> {document file "Math.png" of folder "169" of folder "test" of folder "Downloads" of folder "tim" of folder "Users" of startup disk}
        get document file "Math.png" of folder "169" of folder "test" of folder "Downloads" of folder "tim" of folder "Users" of startup disk
                --> alias "Paul:Users:tim:Downloads:test:169:Math.png"
end tell
tell application "Image Events"
        open alias "Paul:Users:tim:Downloads:test:169:Math.png"
                --> image "Math.png"
        get dimensions of image "Math.png"
                --> {2560, 1440}
        scale image "Math.png" to size 1920
        get name of image "Math.png"
                --> "Math.png"
        get name of image "Math.png"
                --> "Math.png"
        offset of "." in "Math.png"
                --> error number -1708
        «event ascrgdut»
                --> error number -1708
        offset of "." in "Math.png"
                --> error number -10004
end tell
tell current application
        offset of "." in "Math.png"
                --> 5
end tell
tell application "Finder"
        get parent of document file "Math.png" of folder "169" of folder "test" of folder "Downloads" of folder "tim" of folder "Users" of startup disk
                --> alias "Paul:Users:tim:Downloads:test:169:"
end tell
tell application "Image Events"
        save image "Math.png" in "/Users/tim/Downloads/test/169/Math_1920x1080.png" as PNG
                --> file "Paul:Users:tim:Downloads:test:169:Math_1920x1080.png"
        scale image "Math.png" to size 1366
        get name of image "Math.png"
                --> "Math.png"
        get name of image "Math.png"
                --> "Math.png"
        offset of "." in "Math.png"
                --> error number -10004
end tell
tell current application
tell application "Finder"
        get selection
                --> {document file "Math.png" of folder "169" of folder "test" of folder "Downloads" of folder "tim" of folder "Users" of startup disk}
        get document file "Math.png" of folder "169" of folder "test" of folder "Downloads" of folder "tim" of folder "Users" of startup disk
                --> alias "Paul:Users:tim:Downloads:test:169:Math.png"
end tell
tell application "Image Events"
        open alias "Paul:Users:tim:Downloads:test:169:Math.png"
                --> image "Math.png"
        get dimensions of image "Math.png"
                --> {2560, 1440}
        scale image "Math.png" to size 1920
        get name of image "Math.png"
                --> "Math.png"
        get name of image "Math.png"
                --> "Math.png"
        offset of "." in "Math.png"
                --> error number -1708
        «event ascrgdut»
                --> error number -1708
        offset of "." in "Math.png"
                --> error number -10004
end tell
tell current application
        offset of "." in "Math.png"
                --> 5
end tell
tell application "Finder"
        get parent of document file "Math.png" of folder "169" of folder "test" of folder "Downloads" of folder "tim" of folder "Users" of startup disk
                --> alias "Paul:Users:tim:Downloads:test:169:"
end tell
tell application "Image Events"
        save image "Math.png" in "/Users/tim/Downloads/test/169/Math_1920x1080.png" as PNG
                --> file "Paul:Users:tim:Downloads:test:169:Math_1920x1080.png"
        scale image "Math.png" to size 1366
        get name of image "Math.png"
                --> "Math.png"
        get name of image "Math.png"
                --> "Math.png"
        offset of "." in "Math.png"
                --> error number -10004
end tell
tell current application
        offset of "." in "Math.png"
                --> 5
end tell
tell application "Finder"
        get parent of document file "Math.png" of folder "169" of folder "test" of folder "Downloads" of folder "tim" of folder "Users" of startup disk
                --> alias "Paul:Users:tim:Downloads:test:169:"
end tell
tell application "Image Events"
        save image "Math.png" in "/Users/tim/Downloads/test/169/Math_1366x768.png" as PNG
                --> file "Paul:Users:tim:Downloads:test:169:Math_1366x768.png"
end tell
Result:
file "Paul:Users:tim:Downloads:test:169:Math_1366x768.png" of application "Image Events"

我在 Finder 中选择了 ./Math.png 再次运行脚本：

tell application "Finder"
        get selection
                --> {document file "Math.png" of folder "test" of folder "Downloads" of folder "tim" of folder "Users" of startup disk}
        get document file "Math.png" of folder "test" of folder "Downloads" of folder "tim" of folder "Users" of startup disk
                --> alias "Paul:Users:tim:Downloads:test:Math.png"
end tell
tell application "Image Events"
        open alias "Paul:Users:tim:Downloads:test:Math.png"
                --> image "Math.png"
        get dimensions of image "Math.png"
                --> {2560, 1440}
        scale image "Math.png" to size 1920
        get name of image "Math.png"
                --> "Math.png"
        get name of image "Math.png"
                --> "Math.png"
        offset of "." in "Math.png"
                --> error number -10004
end tell
tell current application
        offset of "." in "Math.png"
                --> 5
end tell
tell application "Finder"
        get parent of document file "Math.png" of folder "test" of folder "Downloads" of folder "tim" of folder "Users" of startup disk
                --> alias "Paul:Users:tim:Downloads:test:"
end tell
tell application "Image Events"
        save image "Math.png" in "/Users/tim/Downloads/test/Math_1920x1080.png" as PNG
                --> file "Paul:Users:tim:Downloads:test:Math_1920x1080.png"
        scale image "Math.png" to size 1366
        get name of image "Math.png"
                --> "Math.png"
        get name of image "Math.png"
                --> "Math.png"
        offset of "." in "Math.png"
                --> error number -10004
end tell
tell current application
        offset of "." in "Math.png"
                --> 5
end tell
tell application "Finder"
        get parent of document file "Math.png" of folder "test" of folder "Downloads" of folder "tim" of folder "Users" of startup disk
                --> alias "Paul:Users:tim:Downloads:test:"
end tell
tell application "Image Events"
        save image "Math.png" in "/Users/tim/Downloads/test/Math_1366x768.png" as PNG
                --> file "Paul:Users:tim:Downloads:test:Math_1366x768.png"
end tell
Result:
file "Paul:Users:tim:Downloads:test:Math_1366x768.png" of application "Image Events"

请注意，之前选择的./169/Math.png 是我调用open currentWallpaper as (alias) 时打开的那个，尽管正确的壁纸显示在Finder 选择中。换句话说，并不是 Finder 卡在了旧的选择上，而是我循环浏览的壁纸卡在了旧的壁纸上。

也许更奇怪的是，如果我移动我选择的旧壁纸，当前壁纸参考也会随之移动！换句话说，即使我丢弃旧的选择，脚本的输出也会报告它正在打开 ./.Trashes 中的选择。

只要名字不同，似乎就不会混淆。

脚本：

tell application "Finder" to set wallpapers to selection

set myDimensions to {w169:[{2560, 1440}, {1920, 1080}, {1366, 768}], w1610:[{2560, 1600}, {1920, 1200}, {1440, 900}, {1280, 800}], f43:[{1600, 1200}], s:[{1024, 1024}]}

tell application "Image Events"
    repeat with currentWallpaper in wallpapers
            set theWallpaper to open (currentWallpaper as alias)
            tell theWallpaper
                    set theWallpaperDimensions to dimensions of theWallpaper
                    set currentAspects to {}
                    if my aspectsEqual(16 / 10, theWallpaperDimensions) then set currentAspects to w1610 of myDimensions
                    if my aspectsEqual(16 / 9, theWallpaperDimensions) then set currentAspects to w169 of myDimensions
                    if my aspectsEqual(4 / 3, theWallpaperDimensions) then set currentAspects to f43 of myDimensions
                    if my aspectsEqual(1, theWallpaperDimensions) then set currentAspects to s of myDimensions
                    repeat with dim in currentAspects
                            -- Scale and Crop to current dimensions
                            if item 1 of theWallpaperDimensions is greater than item 1 of dim then
                                    scale to size (get item 1 of dim)

                                    -- Set up save target
                                    set namePrefix to text items 1 thru ((offset of "." in (get name)) - 1) of (get name) as string
                                    tell application "Finder"
                                            set _ to parent of currentWallpaper as alias
                                            set parentPath to POSIX path of _
                                    end tell
                                    set saveTarget to parentPath & namePrefix & "_" & (get item 1 of dim) & "x" & (get item 2 of dim) & ".png"

                                    --save to target
                                    save in saveTarget as PNG
                            end if
                    end repeat
            end tell
    end repeat
end tell

on aspectsEqual(baseAspect, wallpaperDimensions)
    set wallpaperAspect to (item 1 of wallpaperDimensions) / (item 2 of wallpaperDimensions)
    set aspectDifference to baseAspect - wallpaperAspect
    if aspectDifference is less than 0 then set aspectDifference to aspectDifference * -1
    return aspectDifference is less than 1.0E-3
end aspectsEqual

Answer 1

问题是由“图像事件”返回对打开图像的引用的方式引起的：

open alias "Paul:Users:tim:Downloads:test:Math.png"
        --> image "Math.png"
open alias "Paul:Users:tim:Downloads:test:169:Math.png"
        --> image "Math.png"

打开的图像按名称引用。如果您打开另一个同名图像，返回的引用可能偶尔会引用以前打开的同名图像。

作为一种解决方法，在您进入处理所选图像的循环之前添加close every image。此外，您需要在完成后关闭打开的图像：

tell application "Image Events"
    close every image
    repeat with currentWallpaper in wallpapers
        set theWallpaper to open (currentWallpaper as alias)
        tell theWallpaper
        ...
        end tell
        close theWallpaper
    end repeat
end tell