applescript圖標問題（button_pressed是不定義）

Question

這個腳本工作正常，直到按鈕的命令，有人可以告訴我爲什麼我didesent工作？

它說： 「button_pressed不definded」

display dialog "bla" with icon alias ((path to me) & "Contents:Resources:my.icns" as string) buttons {"blu", "bli", "blaa"} default button 3 

if the button_pressed is "blu" then 
    -- action for 1st button goes here 
    say "blu" 
else if the button_pressed is "bli" then 
    -- action for 2nd button goes here 
    say "bli" 
else 
    -- action for 3rd button goes here 
    say "bla" 
end if 

Answer 1

適當的方式做到這一點是使用button returned：

 
display dialog "bla" with icon alias ((path to me) & "Contents:Resources:my.icns" as string) buttons {"blu", "bli", "blaa"} default button 3 

set theResponse to button returned of the result 

if theResponse is "blu" then 
    -- action for 1st button goes here 
    say "blu" 
else ... 

Answer 2

因爲變量button_pressed沒有定義出現的錯誤。你所要做的就是在if塊之前添加這行代碼，它應該可以工作！

set the button_pressed to the button returned of the result 

變量（即button_pressed）必須ALWAYS來限定它們可以uesd之前。例如，該代碼將無法正常工作......

display dialog greeting --> ERROR 

...而這一次將：

set greeting to "Hello! I am now a defined variable!" 
display dialog greeting