Question

尝试编写一个简单的脚本将图像文件转换为不同的大小，AppleScript在保存文件时不断返回“缺失值”。任何人都知道以下代码中发生了什么？

set f to choose file

set image_file to f as alias

convertFile(image_file, "_512@2x.", 1024)
convertFile(image_file, "_512.", 512)

-- iPad (iOS 7+)
convertFile(image_file, "_76@2x.", 152)
convertFile(image_file, "_76.", 76)

-- iPad (iOS 6)
convertFile(image_file, "_72@2x.", 144)
convertFile(image_file, "_72.", 72)

-- iPhone (iOS 7+)
convertFile(image_file, "_60@3x.", 180)
convertFile(image_file, "_60@2x.", 120)
convertFile(image_file, "_60.", 60)

-- iPhone (iOS 6)
convertFile(image_file, "_57@2x.", 114)
convertFile(image_file, "_57.", 57)

-- iPhone (iOS 7 Spotlight)
convertFile(image_file, "_40@2x.", 80)
convertFile(image_file, "_40.", 40)

-- iPhone (iOS 5,6 Spotlight, iOS 5-7 Settings)
convertFile(image_file, "_29@2x.", 58)
convertFile(image_file, "_29.", 29)

on convertFile(source_file, file_spec, image_size)
    set my_path to POSIX path of source_file

    set AppleScript's text item delimiters to "/"
    set path_parts to text items of my_path
    if last item of path_parts is not "" then
        set file_name to last item of path_parts
        set file_path to items 1 thru -2 of path_parts as string
    end if

    set AppleScript's text item delimiters to "."
    set filename_parts to text items of file_name
    set prefix to items 1 thru -2 of filename_parts as string
    set suffix to last item of filename_parts

    set target_posix_path to file_path & "/" & prefix & file_spec & suffix
    set target_posix_file to target_posix_path as POSIX file

    tell application "Image Events"
        set this_image to open source_file
        scale this_image to size image_size
        save this_image in target_posix_path
        close this_image saving no
    end tell
end convertFile

活动＆amp;在我的MacBook Air上回复输出（Mac OS X 10.9.5）：

tell application "AppleScript Editor"
    choose file
        --> alias "Macintosh HD:Users:william:Desktop:goro_icon:icon.png"
end tell
tell application "Image Events"
    open alias "Macintosh HD:Users:william:Desktop:goro_icon:icon.png"
        --> image "icon.png"
    scale image "icon.png" to size 1024
    save image "icon.png" as PNG in "/Users/william/Desktop/goro_icon/icon_512@2x.png"
        --> file "Macintosh HD:Users:william:Desktop:goro_icon:icon_512@2x.png"
    close image "icon.png" saving no
    open alias "Macintosh HD:Users:william:Desktop:goro_icon:icon.png"
        --> image "icon.png"
    scale image "icon.png" to size 512
    save image "icon.png" as PNG in "/Users/william/Desktop/goro_icon/icon_512.png"
        --> missing value
    close image "icon.png" saving no
    open alias "Macintosh HD:Users:william:Desktop:goro_icon:icon.png"
        --> image "icon.png"
    scale image "icon.png" to size 152
    save image "icon.png" as PNG in "/Users/william/Desktop/goro_icon/icon_76@2x.png"
        --> missing value
    close image "icon.png" saving no
    (omitted the long list of same errors..)
end tell

Answer 1

最后，在尝试了Paul在上面的评论中提到的内容之后，我找到了与文件本身相关的问题的原因。我用另一个文件尝试了脚本，脚本没有问题。

在编辑器中打开文件并导出具有相同尺寸的新文件（因此文件看起来相同，但大小不同）。新文件有效。因此，问题可能是由一些未发现的图像事件错误引起的。

AppleScript保存图像缺失值bug？

1 个答案: