我如何检查是否文本可以转换为AppleScript的一个数字？ [英] How do I check if text can be converted to a number in AppleScript?

问题描述

我试图写一个简单的AppleScript做剪贴板上的内容，一些文本操作。下面code工作只有在剪贴板中的文字可以转换成一个数字：

I'm trying to write a simple AppleScript to do some text manipulation on the contents of the clipboard. The following code works only if the text in the clipboard can be converted to a number:

set CB to the clipboard
set bugNum to CB as number

但是，如果在剪贴板文本不是数字，我得到一个AppleScript的错误：到类型号，不能使富

But if the text in the clipboard is not a number I get an AppleScript error: "Can’t make "foo" into type number."

我如何写，如果我可以用它来检查，​​如果CB（类文本）可以被转换成一个数字（并且把设置为bugNum作为CB号里面的那个）的条件？或我可以捕获的错误不知何故？

How do I write an if condition that I can use to check if CB (of class text) can be converted to a number (and put the "set bugNum to CB as number" inside that)? Or can I "catch" the error somehow?

推荐答案

你已经读过<一个href=\"http://developer.apple.com/documentation/AppleScript/Conceptual/AppleScriptLangGuide/reference/ASLR_error_xmpls.html\"相对=nofollow>有错误的工作的AppleScript的指南？

Did you already read working with errors in the Applescript guide?

样code：

set CB to the clipboard
try
    set bugNum to CB as number
on error errStr number errNum
    set bugNum to -1
end try
display dialog "Number from the clipboard: " & bugNum

我跳过了code中的第一次全面，因为我想通了导游是pretty清晰，远远超过任何我可以在这里写更多有用：）

I skipped the code the first time round since I figured the guide was pretty clear, and far more useful than anything I could write here :)

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