AppleScript清单及其子句

Question

AppleScript初学者在这里，仍然苦于基本的语法。

这工作：

tell application "Mail" 
    set flagged to messages of inbox whose flagged status is true 
    log count of flagged 
end tell 

这不起作用：

tell application "Mail" 
    set msgs to messages of inbox 
    set flagged to msgs whose flagged status is true 
    log count of flagged 
end tell 

为什么？ （我怀疑它是在逃避我一个简单的语法规则）

Answer 1

当你写set msgs to messages of inbox，你真正想说的是set msgs to GET messages of inbox作为AppleScript的自动执行命令get如果你不告诉它，否则，其结果是（消息引用）一个AppleScript列表，如：

{message id 123 of mailbox "Inbox" ..., message 124 of mailbox "Inbox" ...} 

然而，whose查询（引用）只能在应用对象的工作，而不是AppleScript的列表，如：

every item of {1, 2, 3, 4, 5} where it > 3 
-- error "Can’t get {1, 2, 3, 4, 5} whose it > 3." number -1728 

请尝试改为：

tell application "Mail" 
    set msgs to a reference to messages of inbox 
    set flagged to msgs whose flagged status is true 
    log count of flagged 
end tell