如何使用变量获得“引用形式”？答案

【问题标题】：How can I get a 'quoted form of' using a variable?如何使用变量获得“引用形式”？
【发布时间】：2019-04-10 18:29:25
【问题描述】：

我一直在努力创建一个迭代文件并能够从聚光灯元数据中获取“关键字”元数据的脚本。在 stackoverflow 上从其他人那里获得帮助时，我已经能够获取元数据，但我无法遍历文件。

tell application "Finder"
set sourceFolder to folder POSIX file "/Users/jdavidson/Desktop/Upload/Birds and Butterflies/HighRes/"
set theFiles to files of sourceFolder
set inputPath to "/Users/jdavidson/Desktop/Upload/Birds and Butterflies/"

end tell

repeat with afile in theFiles
set filename to name of afile
set fname to text 1 thru ((offset of "." in filename) - 1) of filename
set pathVAR1 to "/Users/jdavidson/Desktop/Upload/Birds and Butterflies/HighRes/"
set pathVAR2 to pathVAR1 & filename
--set pathVAR3 to "\"" & pathVAR2 & "\""
set pathVAR3 to quoted form of pathVAR2

display dialog pathVAR3

set myvar to do shell script "mdls -name kMDItemKeywords " & pathVAR3

--Substring's the data to between "(" and ")"--
--set var1 to var1 + 1
set var2 to ((offset of ")" in myvar) - 1)
--set var2 to var2 - 1
set myKeywords to ((characters var1 thru var2 of myvar) as string)
display dialog myKeywords

end repeat

确实有效且不会出错的代码如下：

set myvar to do shell script "mdls -name kMDItemKeywords " & quoted form of "/Users/jdavidson/Desktop/Upload/Birds and Butterflies/To Process/Floral/RF78-3.tif"
set var1 to ((offset of "(" in myvar) + 1)
--set var1 to var1 + 1
set var2 to ((offset of ")" in myvar) - 1)
--set var2 to var2 - 1
set myKeywords to ((characters var1 thru var2 of myvar) as string)
display dialog myKeywords

问题是能够以“引用形式”将变量传递给 shell

【问题讨论】：

标签： macos shell automation applescript

【解决方案1】：

以alias list 获取文件夹中的文件并从别名中获取 POSIX 路径更容易。

path to desktop as text 是当前用户桌面的 (HFS) 路径

set sourceFolder to (path to desktop as text) & "Upload:Birds and Butterflies:HighRes:"
tell application "Finder"
    set theFiles to files of folder sourceFolder as alias list
end tell

repeat with aFile in theFiles
    set myvar to do shell script "mdls -name kMDItemKeywords " & quoted form of POSIX path of aFile
    --- ...
end repeat

【讨论】：

【解决方案2】：

我重写了所有内容，并能够使用以下代码使其工作：

    set pathVAR1 to "/Users/johndavidson/Desktop/Upload/Temp/HighRes/"

    set pathVAR2 to pathVAR1 & filename

    set myvar to do shell script "mdls -name kMDItemKeywords " & quoted form of pathVAR2

    set var1 to ((offset of "(" in myvar) + 1)

    set var2 to ((length of myvar) - 1)

    set myKeywords to ((characters var1 thru var2 of myvar) as string)

【讨论】：