通过终端/bashscript 将参数传递给 applescript 时出现问题

Question

我试图通过 bashscript 和 applescript 控制多个 VLC 实例 - 我通过它们的 pid 访问它们。我在一个小型手动测试中得到了这个工作，效果很好：

tell application "System Events"
set VLC_VGA to application processes whose unix id is 598
repeat with proc in VLC_VGA
    set the frontmost of proc to true
    keystroke "p" using {command down}
end repeat
end tell

我现在想动态插入 pid（598 或任何可能的值）。这是我到目前为止所拥有的 - 但不起作用：

property accumulator : ""

on run argv
set vlcPID to item 1 of argv
set accumulator to do shell script "echo 'echo test returns'" without altering line endings
startPlayingVLC(vlcPID)
set ln to do shell script "echo 'started VLC instance: " & vlcPID & "'" without altering line endings
set accumulator to accumulator & ln
return accumulator
end run

on startPlayingVLC(pid)
tell application "System Events"
    set ln2 to do shell script "echo 'starting VLC instance: " & pid & "'" without altering line endings
    set accumulator to accumulator & ln2
    set VLC_VGA to application processes whose unix id is pid
    set ln3 to do shell script "echo 'VLC_VGA process: " & VLC_VGA & "'" without altering line endings
    set accumulator to accumulator & ln3
    repeat with proc in VLC_VGA
        set the frontmost of proc to true
        keystroke "p" using {command down}
    end repeat
end tell
end startPlayingVLC

我通过调用脚本

osascript /Users/devuser/Development/AppleScript/playVLCAppViaPID.scpt 598

这不再起作用 - pid 无法识别。 do shell 脚本调用基于 另一个关于在循环中执行 shell 脚本的问题，效果很好。

到目前为止，我发现它无法识别以下行中的 pid

 set VLC_VGA to application processes whose unix id is pid

。即使 pid 已正确传递并且 echo (ln2) 显示正确的 pid，VLC_VGA 上的 echo (ln3) 之后也不会返回任何内容。

我在这里做错了什么？

Answer 1

已解决的问题：pid 需要作为整数传递。

如：

set VLC_VGA to application processes whose unix id is pid as integer