Reliability of setProp/getProp

[Michael Doub]

> I don't understand "but I can add put statements... NOT in the getProp/setProp handlers". What do you mean?


When I was not able to set a breakpoint.   I started to selectively include "Put xxx" so I could track the progress of app.   I included put statement in both the handlers and in the setProp script.
I do not see any output from the put statement that is in the setProp script.

> Surely, stacks can get corrupted, but I have seen this happen only once during the past few years. The reason was that the stack was moved from Windows to Mac and opened, while text fields and scripts were somehow not re-encoded.

Ah ha.  A new clue.  This stack WAS moved to a windows system and brought back to mac!  



On 2012-01-15, at 9:35 AM, Mark Schonewille wrote:

> Hi Mike,
> 
> The debugger is not reliable to begin with, but there might be a valid reason why you can't set a breakpoint, e.g. because that line is commented out.
> 
> I don't understand "but I can add put statements... NOT in the getProp/setProp handlers". What do you mean?
> 
> It is possible that you have a character in your script that messes things up, e.g. a NULL character or a return (rather than linefeed) character. Set the script to empty and retype. Don't copy-paste. You might also use a hex editor to find such characters and tools like BBEdit and TextWrangler allow you to see invisible characters.
> 
> Surely, stacks can get corrupted, but I have seen this happen only once during the past few years. The reason was that the stack was moved from Windows to Mac and opened, while text fields and scripts were somehow not re-encoded.
> 
> --
> Best regards,
> 
> Mark Schonewille
> 
> Economy-x-Talk Consulting and Software Engineering
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> On 15 jan 2012, at 15:01, Michael Doub wrote:
> 
>> I have a group "Pointer" that is made of 2 graphic objects.  Within the script of group "Pointer", I have:
>> 
>> setprop thecolor newcolor
>> getProp thecolor 
>> setprop finger newloc
>> 
>> I am not using them to set any persistent state but to control the color and location of the object itself.
>> 
>> When this behaviour starts, I am not able to set a breakpoints,  but I can add put statements and that handlers are getting called, but NOT in the getProp/setProp handlers.   This app has been working for sometime now until I started making changes in totally unrelated areas of the code.   I have gone back to the original working version twice now, trying to carefully make changes and testing trying to isolate what introduces the problem.
>> 
>> I have also noticed that the debugger is off by several lines if you try single stepping.   Can stacks get corrupted?  
>> 
>> -= Mike
> 
> 
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