Applescript Stack Overflow Error
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Fix Stack Overflow Error
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them; it only takes a minute: Sign up AppleScript - StackOverflow error up vote 0 down vote favorite I just started using applescript today, and heard about subroutines. So I decided to write a little test program that takes a
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number, increments it by 9, subtracts 27, divides by 3, and then returns the result. Only it doesn't return the result; it returns a StackOverFlow error instead. What is a StackOverFlow error? The program compiled correctly, and I don't know what is wrong. Like I said, I'm very new to applescript. Here is the code that I'm running: calculate_result(text returned of (display dialog "Enter a number:" default answer "")) on calculate_result(this_result) set this_result to this_result + 9 set this_result stack overflow javascript error to this_result - 27 set this_result to this_result / 3 return calculate_result(this_result) end calculate_result applescript stack-overflow subroutine share|improve this question asked Aug 12 '11 at 21:56 Dennis 1 add a comment| 3 Answers 3 active oldest votes up vote 3 down vote An excerpt from an answer to a similar question... Parameters and local variables are allocated on the stack (with reference types the object lives on the heap and a variable references that object). The stack typically lives at the upper end of your address space and as it is used up it heads towards the bottom of the address space (ie towards zero). Your process also has a heap, which lives at the bottom end of your process. As you allocate memory this heap can grow towards the upper end of your address space. As you can see, there is the potential for the heap to "collide" with the stack (a bit like techtonic plates!!!). A Stack Overflow error means that the stack (your subroutine) overflowed (executed itself so many times that it crashed). Stack Overflow errors usually result from a bad recursive call (in the case of AppleScript, a bad subroutine call). In general, if your subroutines return values, make sure that value is not the subroutine name. Otherwise the stack will overflow, crashing your program (if the return statement is not inside a try block). Just change this: return calculate_result(this_result) ...
MalasaƱa, Madrid Registered: 2002-11-20 Posts: 2014 What is "Stack overflow"? This is a very bad thing you must avoid. Some times an executing code can overflow the heap-memory of the stack overflow line error application, causing memory leaks and crashes.It's the same as if you attempt stack overflow line 0 error to eat an elephant in a single try, allocate a square, or a juggler playing with two hundreds stack overflow error java of marbles.Here is a tricky sample of stack overflow:Applescript:set x to {alias "path:to:some file.dlg"} set end of x to x tell application "Finder" to duplicate xWe created a recursive http://stackoverflow.com/questions/7046763/applescript-stackoverflow-error list containing itself, and passed such list to the Finder, which is primarilly absurd, a cool cultivation for a stack overflow.The most common sample of stack overflow is when you attempt to create a list of (eg) 10.000 items involving AppleScript's text item delimiters. Classical example:Applescript:set x to (read alias "path:to:some file.txt") set AppleScript's text item delimiters to space set http://macscripter.net/viewtopic.php?id=24464 x to x's text items set AppleScript's text item delimiters to {""}If the related file contains 10.000 spaces, this code will throw a stack overflow error, since the approximate limit is 4.060 items. However, Apple points that this error is not present for Unicode text, and promised trashing out this error for next AppleScript releases (OS 10.3, the Panther, and further).You can find some more examples of stack overflow errors with recursion here. Filed under: Finder Offline Pages: 1 Index»Core Language»What is "Stack overflow"? Board footer Jump to ScriptWire unScripted AppleScript | Mac OS X AppleScriptObjC and Xcode AppleScript Studio & Xcode Code Exchange Automator Books / Resources >>> AppleScript Links >>> MacDeveloper >>> iBetaTest >>> About the Applescript Sourcebook AppleScript for Absolute Starters About Applescript About Automator Applescript Versions Scripting Tips Scripting Components Bugs Discovered in Leopard Bugs Discovered in Tiger AppleScript Language Guide >>> General Information Core Language Applescript Studio OS X Finder Text Manipulation Application Scripting Scripting Additions Folder Actions Miscellaneous Info Powered by FluxBB [ Generated in 0.094 seconds, 8 queries executed ]
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