Re: Script local variables
A quick update on the problem that I experienced with initialisation of script locals. Mark Waddingham posted the following comment on the bug report that I made: START COMMENT I think I know what is happening here - when the stack is being saved as a standalone, the stack is closed and reopened in the IDE. I suspect that this process is failing to run the openStack handler. Therefore, after saving the standalone, the stack in the IDE is not in the same state as the standalone is after starting up. Indeed, if you 'revert to saved' in the IDE after saving as standalone the openStack handler is run. END COMMENT He has kindly corrected the title of my bug report - http://quality.runrev.com/show_bug.cgi?id=11832 Now I'm going to change the script local variables to constants which Jacque was kind enough to introduce to me in a previous comment on this thread. If only I'd known about them in the beginning, I wouldn't have stumbled across this possible bug. Regards Peter On 24 Feb 2014, at 03:09, J. Landman Gay wrote: On 2/23/14, 12:17 PM, Bob Sneidar wrote: Could it be that editing the script resets the script local variables? This is true in Applescript properties. Editing and saving the script resets the properties to their defaults. Don't think so, that was one of my first tests when I tried to reproduce the problem. I'm going with script error as the culprit for now. -- Jacqueline Landman Gay | jac...@hyperactivesw.com HyperActive Software | http://www.hyperactivesw.com ___ use-livecode mailing list use-livecode@lists.runrev.com Please visit this url to subscribe, unsubscribe and manage your subscription preferences: http://lists.runrev.com/mailman/listinfo/use-livecode ___ use-livecode mailing list use-livecode@lists.runrev.com Please visit this url to subscribe, unsubscribe and manage your subscription preferences: http://lists.runrev.com/mailman/listinfo/use-livecode
Re: Script local variables
I've just read that bit of the dictionary and I'm equally surprised. I also think I must have completely misunderstood it, because I can't see how it can work. The value of a script local variable (unless it's predefined using an '=' construction) is undefined until a script is run, and is then only defined when an executing script puts something into the variable. A script can only be run when the program is executing. When the program containing the script quits, any information in variables, global or local, is lost because one can't normally save an executable stack outside the IDE (yes, I know about splash stacks and such, but the principle is correct). So next time the script is compiled, we **must** be back at square one, and the value of local variables **cannot** be maintained. What's wrong with this thinking? Puzzled Graham On 23 Feb 2014, at 03:58, J. Landman Gay jac...@hyperactivesw.com wrote: On 2/22/14, 8:42 PM, Mark Wieder wrote: Scott- Saturday, February 22, 2014, 6:26:31 PM, you wrote: Uh, oh -- I do this all the time. Is this really not supposed to work? It sometimes works, but it's not legal syntax. I don't know of any particular reason why not, but it's not. They must have changed it when you and I weren't looking. Variable assignments are even listed in the examples in the dictionary entry for local. I may have to read the whole dictionary again to see what else I've missed. I may also have found a clue to disappearing locals. The same entry says this: If variable preservation is turned on, script locals retain their values when the script is re-compiled, unless there is an error in the script. I'm quite sure I've produced enough errors to have destroyed a few script locals in my time, so maybe that's what's wrong. I'll try to pay more attention. -- Jacqueline Landman Gay | jac...@hyperactivesw.com HyperActive Software | http://www.hyperactivesw.com ___ use-livecode mailing list use-livecode@lists.runrev.com Please visit this url to subscribe, unsubscribe and manage your subscription preferences: http://lists.runrev.com/mailman/listinfo/use-livecode ___ use-livecode mailing list use-livecode@lists.runrev.com Please visit this url to subscribe, unsubscribe and manage your subscription preferences: http://lists.runrev.com/mailman/listinfo/use-livecode
Re: Script local variables
Jacque- Saturday, February 22, 2014, 6:58:35 PM, you wrote: They must have changed it when you and I weren't looking. Variable assignments are even listed in the examples in the dictionary entry for local. I may have to read the whole dictionary again to see what else I've missed. OK - I stand corrected. My memory is the same as yours, and I could swear that sometime in the distant past someone even corrected me when I attempted to do this. But I just dusted off my copy of the RR 2.0 hardcopy dictionary, and it has the same examples. -- -Mark Wieder ahsoftw...@gmail.com This communication may be unlawfully collected and stored by the National Security Agency (NSA) in secret. The parties to this email do not consent to the retrieving or storing of this communication and any related metadata, as well as printing, copying, re-transmitting, disseminating, or otherwise using it. If you believe you have received this communication in error, please delete it immediately. ___ use-livecode mailing list use-livecode@lists.runrev.com Please visit this url to subscribe, unsubscribe and manage your subscription preferences: http://lists.runrev.com/mailman/listinfo/use-livecode
Re: Script local variables
Could it be that editing the script resets the script local variables? This is true in Applescript properties. Editing and saving the script resets the properties to their defaults. Bob On Feb 22, 2014, at 10:56 , J. Landman Gay jac...@hyperactivesw.com wrote: On 2/22/14, 12:17 PM, Peter Haworth wrote: I think this is dependant on the Variable Preservation setting on the Preferences Script Editor tab. It is, but there's a bug in it somewhere. I use script locals extensively and they always worked until somewhere around version 6.x. After that the values were occasionally lost. Every subsequent version has made the problem worse, and now I lose them so often that I've had to add a reload of the values to almost every handler I'm debugging. Since I can't find a consistent recipe (sometimes they do work) I haven't reported it yet, but it's making my life difficult. All I know is that it happens some time after I change a script, but not every time, so I'm at a loss. -- Jacqueline Landman Gay | jac...@hyperactivesw.com HyperActive Software | http://www.hyperactivesw.com ___ use-livecode mailing list use-livecode@lists.runrev.com Please visit this url to subscribe, unsubscribe and manage your subscription preferences: http://lists.runrev.com/mailman/listinfo/use-livecode ___ use-livecode mailing list use-livecode@lists.runrev.com Please visit this url to subscribe, unsubscribe and manage your subscription preferences: http://lists.runrev.com/mailman/listinfo/use-livecode
Re: Script local variables
On 2/23/14, 12:17 PM, Bob Sneidar wrote: Could it be that editing the script resets the script local variables? This is true in Applescript properties. Editing and saving the script resets the properties to their defaults. Don't think so, that was one of my first tests when I tried to reproduce the problem. I'm going with script error as the culprit for now. -- Jacqueline Landman Gay | jac...@hyperactivesw.com HyperActive Software | http://www.hyperactivesw.com ___ use-livecode mailing list use-livecode@lists.runrev.com Please visit this url to subscribe, unsubscribe and manage your subscription preferences: http://lists.runrev.com/mailman/listinfo/use-livecode
Re: Script local variables
On 2/23/14, 4:30 AM, Graham Samuel wrote: I've just read that bit of the dictionary and I'm equally surprised. I also think I must have completely misunderstood it, because I can't see how it can work. The value of a script local variable (unless it's predefined using an '=' construction) is undefined until a script is run, and is then only defined when an executing script puts something into the variable. A script can only be run when the program is executing. When the program containing the script quits, any information in variables, global or local, is lost because one can't normally save an executable stack outside the IDE (yes, I know about splash stacks and such, but the principle is correct). So next time the script is compiled, we **must** be back at square one, and the value of local variables **cannot** be maintained. What's wrong with this thinking? Since I just discovered this, I'm trying to figure it out too. There must be a difference between declaring a constant and declaring a variable. So the only thing I can think of is that a script local variable can be altered by different handlers in the script, where a constant cannot. I.e., the value declaration is a starting point but isn't a fixed immutable value the way a constant is. I haven't tried it yet, maybe someone else can confirm. -- Jacqueline Landman Gay | jac...@hyperactivesw.com HyperActive Software | http://www.hyperactivesw.com ___ use-livecode mailing list use-livecode@lists.runrev.com Please visit this url to subscribe, unsubscribe and manage your subscription preferences: http://lists.runrev.com/mailman/listinfo/use-livecode
Re: Script local variables
On Sun, Feb 23, 2014 at 11:09 AM, J. Landman Gay jac...@hyperactivesw.comwrote: Don't think so, that was one of my first tests when I tried to reproduce the problem. I'm going with script error as the culprit for now. I confirm that a script compile error wipes out the contents of any script local variables in the script, at least in a very simple test I did. Pete lcSQL Software http://www.lcsql.com Home of lcStackBrowser http://www.lcsql.com/lcstackbrowser.html and SQLiteAdmin http://www.lcsql.com/sqliteadmin.html ___ use-livecode mailing list use-livecode@lists.runrev.com Please visit this url to subscribe, unsubscribe and manage your subscription preferences: http://lists.runrev.com/mailman/listinfo/use-livecode
Re: Script local variables
On Sun, Feb 23, 2014 at 11:14 AM, J. Landman Gay jac...@hyperactivesw.comwrote: I haven't tried it yet, maybe someone else can confirm. Yes, you can change the value of a script local variable in the way you described What's really interesting though is that the value of a script local variable assigned in this way is NOt wiped out by a script compile error.It feels like the value is assigned to the variable each and every time a handler in the script is executed. Pete lcSQL Software http://www.lcsql.com Home of lcStackBrowser http://www.lcsql.com/lcstackbrowser.html and SQLiteAdmin http://www.lcsql.com/sqliteadmin.html ___ use-livecode mailing list use-livecode@lists.runrev.com Please visit this url to subscribe, unsubscribe and manage your subscription preferences: http://lists.runrev.com/mailman/listinfo/use-livecode
Re: Script local variables
Sorry, hit send too soon. Her's a more detailed version. In a card script, I have local sVar=xyz function getVar return sVar end getVar command changeVar put abc into sVar end changeVar In button A on the card, I have: on mouseUp put getVar() end mouseUp In button B on the card, I have on mouseUp changeVar end mouseUp I click button A and xyz appears in the message box. I click button B, then button A and abc appears in the message box. So you can change the value of script local variables with values assigned in this way. Here's the interesting part. I deliberately caused a script compile error in the card script, corrected it, and recompiled, then clicked button B, and xyz appeared in the message box. So it appears that script compile errors don't wipe out the original value assigned to a script local variable in this way, but not any subsequent changes made to it. I guess that makes sense because it seems like the value is assigned to the script local variable every time a handler in the script is executed. Pete lcSQL Software http://www.lcsql.com Home of lcStackBrowser http://www.lcsql.com/lcstackbrowser.html and SQLiteAdmin http://www.lcsql.com/sqliteadmin.html On Sun, Feb 23, 2014 at 12:52 PM, Peter Haworth p...@lcsql.com wrote: On Sun, Feb 23, 2014 at 11:14 AM, J. Landman Gay jac...@hyperactivesw.com wrote: I haven't tried it yet, maybe someone else can confirm. Yes, you can change the value of a script local variable in the way you described What's really interesting though is that the value of a script local variable assigned in this way is NOt wiped out by a script compile error.It feels like the value is assigned to the variable each and every time a handler in the script is executed. Pete lcSQL Software http://www.lcsql.com Home of lcStackBrowser http://www.lcsql.com/lcstackbrowser.html and SQLiteAdmin http://www.lcsql.com/sqliteadmin.html ___ use-livecode mailing list use-livecode@lists.runrev.com Please visit this url to subscribe, unsubscribe and manage your subscription preferences: http://lists.runrev.com/mailman/listinfo/use-livecode
Re: Script local variables
Right, otherwise CONSTANT would just be another name for VARIABLE. Bob On Feb 23, 2014, at 11:14 , J. Landman Gay jac...@hyperactivesw.com wrote: On 2/23/14, 4:30 AM, Graham Samuel wrote: I've just read that bit of the dictionary and I'm equally surprised. I also think I must have completely misunderstood it, because I can't see how it can work. The value of a script local variable (unless it's predefined using an '=' construction) is undefined until a script is run, and is then only defined when an executing script puts something into the variable. A script can only be run when the program is executing. When the program containing the script quits, any information in variables, global or local, is lost because one can't normally save an executable stack outside the IDE (yes, I know about splash stacks and such, but the principle is correct). So next time the script is compiled, we **must** be back at square one, and the value of local variables **cannot** be maintained. What's wrong with this thinking? Since I just discovered this, I'm trying to figure it out too. There must be a difference between declaring a constant and declaring a variable. So the only thing I can think of is that a script local variable can be altered by different handlers in the script, where a constant cannot. I.e., the value declaration is a starting point but isn't a fixed immutable value the way a constant is. I haven't tried it yet, maybe someone else can confirm. -- Jacqueline Landman Gay | jac...@hyperactivesw.com HyperActive Software | http://www.hyperactivesw.com ___ use-livecode mailing list use-livecode@lists.runrev.com Please visit this url to subscribe, unsubscribe and manage your subscription preferences: http://lists.runrev.com/mailman/listinfo/use-livecode ___ use-livecode mailing list use-livecode@lists.runrev.com Please visit this url to subscribe, unsubscribe and manage your subscription preferences: http://lists.runrev.com/mailman/listinfo/use-livecode
Re: Script local variables
I see that I have misunderstood the context of this 'feature' (if that's what it is). It refers to a situation where one runs a script in the IDE, finds an error, corrects it and runs it again. It's entirely an IDE thing, isn't it? Compilation can happen outside the IDE, for example where a splash stack invokes other stacks containing scripts, but the developer doesn't see this directly so can't mess with the script and go again. I was thinking in a wider context, where the stack gets removed completely from the machine and then is brought back. That isn't what it's about. Not quite so puzzled Graham On 23 Feb 2014, at 20:09, J. Landman Gay jac...@hyperactivesw.com wrote: On 2/23/14, 12:17 PM, Bob Sneidar wrote: Could it be that editing the script resets the script local variables? This is true in Applescript properties. Editing and saving the script resets the properties to their defaults. Don't think so, that was one of my first tests when I tried to reproduce the problem. I'm going with script error as the culprit for now. -- Jacqueline Landman Gay | jac...@hyperactivesw.com HyperActive Software | http://www.hyperactivesw.com ___ use-livecode mailing list use-livecode@lists.runrev.com Please visit this url to subscribe, unsubscribe and manage your subscription preferences: http://lists.runrev.com/mailman/listinfo/use-livecode ___ use-livecode mailing list use-livecode@lists.runrev.com Please visit this url to subscribe, unsubscribe and manage your subscription preferences: http://lists.runrev.com/mailman/listinfo/use-livecode
Re: Script local variables
Hi Bill, Sometimes there are other considerations as to when to use variables or custom properties, I didn't suggest custom props here because I understand that they may still be visible in the IDE in password protected stacks, as these variables were important to the integrity of the app it didn't make sense in this case. I may be wrong on this, but it did crop up in a discussion a while ago and so far I haven't taken it far enough to test it, it's just one of those odd things that stuck in my memory. Could be a worthwhile exercise though. Has anyone tested this? Paul On 2014-02-22, at 8:04 AM, Earthednet-wp proth...@earthednet.org wrote: Mats' posting on encryption difficulties got me thinking about local variables. Are they supposed to persist after the script is done executing, so that the next time a handler within that script is called, they can be expected to hold previously set values? I notice that they don't. Or would this be a task for custom properties? Bill William Prothero http://es.earthednet.org On Feb 22, 2014, at 2:54 AM, Peter W A Wood peterwaw...@gmail.com wrote: Many thanks to Roger Eller, Jan Schenkel, Bill Vlahos and Paul Hibbert (off list) for helping me identify and workaround the issues I encountered. Paul pointed out three things: I didn't the use the text of Field ...; how to overcome not being able to copy text from a field in an OS X standalone; and the final problem that was related to script local variables. Using the text of Field ... instead of Field ... helped to more accurately copy and paste data. (I ended up displaying the encrypted data in Hex anyway.) I had found that I couldn't copy from a Field in an OS X standalone. Paul provide a script with group handlers to get around the problem. I have submitted a bug report which has been accepted - http://quality.runrev.com/show_bug.cgi?id=11830 At this stage, I was still getting inconsistent results when encrypting data in the IDE or a standalone. Then Paul noticed how I was initialising the encryption parameters, namely the script local variables tPassword, tSalt, tIV: openStack put into Field Encrypted put 12345678123456781234567812345678 into tPassword put 12345678123456781234567812345678 into tSalt put 12345678123456781234567812345678 into tIV end openStack on encryptMSG ... end encryptMSG on decryptMSG ... end decryptMSG He changed this to re-setting the three script local fields each time they were used: on openStack put into Field Encrypted end openStack command setPassCodes put 12345678123456781234567812345678 into tPassword put 12345678123456781234567812345678 into tSalt put 12345678123456781234567812345678 into tIV end setPassCodes on encryptMSG setPassCodes ... end encryptMSG on decryptMSG setPassCodes ... end decryptMSG After making this change, I now get identical results when encrypting data with the stack in the IDE or as a standalone. I have also entered a bug report for this - http://quality.runrev.com/show_bug.cgi?id=11832 - I feel there is a bug but not in the encrypt/decrypt functions, it's in the handling of script local variables. Once again, thanks for all the help. Kind regards Peter http://LiveCode1001.blogspot.com ___ use-livecode mailing list use-livecode@lists.runrev.com Please visit this url to subscribe, unsubscribe and manage your subscription preferences: http://lists.runrev.com/mailman/listinfo/use-livecode ___ use-livecode mailing list use-livecode@lists.runrev.com Please visit this url to subscribe, unsubscribe and manage your subscription preferences: http://lists.runrev.com/mailman/listinfo/use-livecode ___ use-livecode mailing list use-livecode@lists.runrev.com Please visit this url to subscribe, unsubscribe and manage your subscription preferences: http://lists.runrev.com/mailman/listinfo/use-livecode
Re: Script local variables
Bonjour, From liveCode Dictionnary: The value of a local variable is retained only while the handler is running. When the handler exits, the value of the local variable is lost. The value of a script local variable is retained between handlers, For more information have a look at local in the dictionnary Best regards André Le 22 févr. 2014 à 17:04, Earthednet-wp a écrit : Mats' posting on encryption difficulties got me thinking about local variables. Are they supposed to persist after the script is done executing, so that the next time a handler within that script is called, they can be expected to hold previously set values? I notice that they don't. Or would this be a task for custom properties? Bill William Prothero http://es.earthednet.org On Feb 22, 2014, at 2:54 AM, Peter W A Wood peterwaw...@gmail.com wrote: Many thanks to Roger Eller, Jan Schenkel, Bill Vlahos and Paul Hibbert (off list) for helping me identify and workaround the issues I encountered. Paul pointed out three things: I didn't the use the text of Field ...; how to overcome not being able to copy text from a field in an OS X standalone; and the final problem that was related to script local variables. Using the text of Field ... instead of Field ... helped to more accurately copy and paste data. (I ended up displaying the encrypted data in Hex anyway.) I had found that I couldn't copy from a Field in an OS X standalone. Paul provide a script with group handlers to get around the problem. I have submitted a bug report which has been accepted - http://quality.runrev.com/show_bug.cgi?id=11830 At this stage, I was still getting inconsistent results when encrypting data in the IDE or a standalone. Then Paul noticed how I was initialising the encryption parameters, namely the script local variables tPassword, tSalt, tIV: openStack put into Field Encrypted put 12345678123456781234567812345678 into tPassword put 12345678123456781234567812345678 into tSalt put 12345678123456781234567812345678 into tIV end openStack on encryptMSG ... end encryptMSG on decryptMSG ... end decryptMSG He changed this to re-setting the three script local fields each time they were used: on openStack put into Field Encrypted end openStack command setPassCodes put 12345678123456781234567812345678 into tPassword put 12345678123456781234567812345678 into tSalt put 12345678123456781234567812345678 into tIV end setPassCodes on encryptMSG setPassCodes ... end encryptMSG on decryptMSG setPassCodes ... end decryptMSG After making this change, I now get identical results when encrypting data with the stack in the IDE or as a standalone. I have also entered a bug report for this - http://quality.runrev.com/show_bug.cgi?id=11832 - I feel there is a bug but not in the encrypt/decrypt functions, it's in the handling of script local variables. Once again, thanks for all the help. Kind regards Peter http://LiveCode1001.blogspot.com ___ use-livecode mailing list use-livecode@lists.runrev.com Please visit this url to subscribe, unsubscribe and manage your subscription preferences: http://lists.runrev.com/mailman/listinfo/use-livecode ___ use-livecode mailing list use-livecode@lists.runrev.com Please visit this url to subscribe, unsubscribe and manage your subscription preferences: http://lists.runrev.com/mailman/listinfo/use-livecode ___ use-livecode mailing list use-livecode@lists.runrev.com Please visit this url to subscribe, unsubscribe and manage your subscription preferences: http://lists.runrev.com/mailman/listinfo/use-livecode
Re: Script local variables
2014-02-22 17:04 GMT+01:00 Earthednet-wp proth...@earthednet.org: Mats' posting on encryption difficulties got me thinking about local variables. Are they supposed to persist after the script is done executing, so that the next time a handler within that script is called, they can be expected to hold previously set values? I notice that they don't. Or would this be a task for custom properties? Hi, Create a simple stack, a field and a button with this script: on mouseUp testlocal testlocal2 end mouseUp on testlocal local x1 add 1 to x1 put x1: x1 cr after fld 1 end testlocal local x2 on testlocal2 add 1 to x2 put x2: x2 cr after fld 1 end testlocal2 This should clarify your concern... Regards, Thierry Thierry Douez - http://sunny-tdz.com Maker of sunnYperl - sunnYmidi - sunnYmage - sunnYpdf ___ use-livecode mailing list use-livecode@lists.runrev.com Please visit this url to subscribe, unsubscribe and manage your subscription preferences: http://lists.runrev.com/mailman/listinfo/use-livecode
Re: Script local variables
That was part of the problem, the value wasn't being retained, maybe for different reasons. The original stack script set the variable values on openStack, then a button script called the stack script handlers to do the encryption, this is where I saw the possibility for the dis-connection, because portions of the stack script were being accessed at separate times. Another way to achieve the same result in this case would be to declare the script variables with values in the stack script. e.g.: local tPassword = 12345678123456781234567812345678 local tSalt = 12345678123456781234567812345678 local tIV = 12345678123456781234567812345678 Often there are many different ways to achieve the same goal, the best way isn't always the most obvious at the time, but that's the beauty of this type of list. Paul On 2014-02-22, at 9:53 AM, André Bisseret andre.bisse...@wanadoo.fr wrote: Bonjour, From liveCode Dictionnary: The value of a local variable is retained only while the handler is running. When the handler exits, the value of the local variable is lost. The value of a script local variable is retained between handlers, For more information have a look at local in the dictionnary Best regards André Le 22 févr. 2014 à 17:04, Earthednet-wp a écrit : Mats' posting on encryption difficulties got me thinking about local variables. Are they supposed to persist after the script is done executing, so that the next time a handler within that script is called, they can be expected to hold previously set values? I notice that they don't. Or would this be a task for custom properties? Bill William Prothero http://es.earthednet.org On Feb 22, 2014, at 2:54 AM, Peter W A Wood peterwaw...@gmail.com wrote: Many thanks to Roger Eller, Jan Schenkel, Bill Vlahos and Paul Hibbert (off list) for helping me identify and workaround the issues I encountered. Paul pointed out three things: I didn't the use the text of Field ...; how to overcome not being able to copy text from a field in an OS X standalone; and the final problem that was related to script local variables. Using the text of Field ... instead of Field ... helped to more accurately copy and paste data. (I ended up displaying the encrypted data in Hex anyway.) I had found that I couldn't copy from a Field in an OS X standalone. Paul provide a script with group handlers to get around the problem. I have submitted a bug report which has been accepted - http://quality.runrev.com/show_bug.cgi?id=11830 At this stage, I was still getting inconsistent results when encrypting data in the IDE or a standalone. Then Paul noticed how I was initialising the encryption parameters, namely the script local variables tPassword, tSalt, tIV: openStack put into Field Encrypted put 12345678123456781234567812345678 into tPassword put 12345678123456781234567812345678 into tSalt put 12345678123456781234567812345678 into tIV end openStack on encryptMSG ... end encryptMSG on decryptMSG ... end decryptMSG He changed this to re-setting the three script local fields each time they were used: on openStack put into Field Encrypted end openStack command setPassCodes put 12345678123456781234567812345678 into tPassword put 12345678123456781234567812345678 into tSalt put 12345678123456781234567812345678 into tIV end setPassCodes on encryptMSG setPassCodes ... end encryptMSG on decryptMSG setPassCodes ... end decryptMSG After making this change, I now get identical results when encrypting data with the stack in the IDE or as a standalone. I have also entered a bug report for this - http://quality.runrev.com/show_bug.cgi?id=11832 - I feel there is a bug but not in the encrypt/decrypt functions, it's in the handling of script local variables. Once again, thanks for all the help. Kind regards Peter http://LiveCode1001.blogspot.com ___ use-livecode mailing list use-livecode@lists.runrev.com Please visit this url to subscribe, unsubscribe and manage your subscription preferences: http://lists.runrev.com/mailman/listinfo/use-livecode ___ use-livecode mailing list use-livecode@lists.runrev.com Please visit this url to subscribe, unsubscribe and manage your subscription preferences: http://lists.runrev.com/mailman/listinfo/use-livecode ___ use-livecode mailing list use-livecode@lists.runrev.com Please visit this url to subscribe, unsubscribe and manage your subscription preferences: http://lists.runrev.com/mailman/listinfo/use-livecode ___ use-livecode mailing list use-livecode@lists.runrev.com Please visit this url to subscribe,
Re: Script local variables
I think this is dependant on the Variable Preservation setting on the Preferences Script Editor tab. I use script local variables a lot in conjunction with handlers to access them from other objects instead of custom properties. I started doing it because custom properties are visible to users in password protected stacks whereas script local variables are not. Pete lcSQL Software http://www.lcsql.com Home of lcStackBrowser http://www.lcsql.com/lcstackbrowser.html and SQLiteAdmin http://www.lcsql.com/sqliteadmin.html On Sat, Feb 22, 2014 at 8:04 AM, Earthednet-wp proth...@earthednet.orgwrote: Mats' posting on encryption difficulties got me thinking about local variables. Are they supposed to persist after the script is done executing, so that the next time a handler within that script is called, they can be expected to hold previously set values? I notice that they don't. Or would this be a task for custom properties? Bill William Prothero http://es.earthednet.org On Feb 22, 2014, at 2:54 AM, Peter W A Wood peterwaw...@gmail.com wrote: Many thanks to Roger Eller, Jan Schenkel, Bill Vlahos and Paul Hibbert (off list) for helping me identify and workaround the issues I encountered. Paul pointed out three things: I didn't the use the text of Field ...; how to overcome not being able to copy text from a field in an OS X standalone; and the final problem that was related to script local variables. Using the text of Field ... instead of Field ... helped to more accurately copy and paste data. (I ended up displaying the encrypted data in Hex anyway.) I had found that I couldn't copy from a Field in an OS X standalone. Paul provide a script with group handlers to get around the problem. I have submitted a bug report which has been accepted - http://quality.runrev.com/show_bug.cgi?id=11830 At this stage, I was still getting inconsistent results when encrypting data in the IDE or a standalone. Then Paul noticed how I was initialising the encryption parameters, namely the script local variables tPassword, tSalt, tIV: openStack put into Field Encrypted put 12345678123456781234567812345678 into tPassword put 12345678123456781234567812345678 into tSalt put 12345678123456781234567812345678 into tIV end openStack on encryptMSG ... end encryptMSG on decryptMSG ... end decryptMSG He changed this to re-setting the three script local fields each time they were used: on openStack put into Field Encrypted end openStack command setPassCodes put 12345678123456781234567812345678 into tPassword put 12345678123456781234567812345678 into tSalt put 12345678123456781234567812345678 into tIV end setPassCodes on encryptMSG setPassCodes ... end encryptMSG on decryptMSG setPassCodes ... end decryptMSG After making this change, I now get identical results when encrypting data with the stack in the IDE or as a standalone. I have also entered a bug report for this - http://quality.runrev.com/show_bug.cgi?id=11832 - I feel there is a bug but not in the encrypt/decrypt functions, it's in the handling of script local variables. Once again, thanks for all the help. Kind regards Peter http://LiveCode1001.blogspot.com ___ use-livecode mailing list use-livecode@lists.runrev.com Please visit this url to subscribe, unsubscribe and manage your subscription preferences: http://lists.runrev.com/mailman/listinfo/use-livecode ___ use-livecode mailing list use-livecode@lists.runrev.com Please visit this url to subscribe, unsubscribe and manage your subscription preferences: http://lists.runrev.com/mailman/listinfo/use-livecode ___ use-livecode mailing list use-livecode@lists.runrev.com Please visit this url to subscribe, unsubscribe and manage your subscription preferences: http://lists.runrev.com/mailman/listinfo/use-livecode
Re: Script local variables
On 2/22/14, 12:17 PM, Peter Haworth wrote: I think this is dependant on the Variable Preservation setting on the Preferences Script Editor tab. It is, but there's a bug in it somewhere. I use script locals extensively and they always worked until somewhere around version 6.x. After that the values were occasionally lost. Every subsequent version has made the problem worse, and now I lose them so often that I've had to add a reload of the values to almost every handler I'm debugging. Since I can't find a consistent recipe (sometimes they do work) I haven't reported it yet, but it's making my life difficult. All I know is that it happens some time after I change a script, but not every time, so I'm at a loss. -- Jacqueline Landman Gay | jac...@hyperactivesw.com HyperActive Software | http://www.hyperactivesw.com ___ use-livecode mailing list use-livecode@lists.runrev.com Please visit this url to subscribe, unsubscribe and manage your subscription preferences: http://lists.runrev.com/mailman/listinfo/use-livecode
Re: Script local variables
Hi Jacque, I've definitely seen values disappear after compiling the script for a long time but didn't worry abut it too much since that only happens during development not in production versions. Like you, I haven't been able to come up with a recipe to reliably reproduce it. Pete lcSQL Software http://www.lcsql.com Home of lcStackBrowser http://www.lcsql.com/lcstackbrowser.html and SQLiteAdmin http://www.lcsql.com/sqliteadmin.html On Sat, Feb 22, 2014 at 10:56 AM, J. Landman Gay jac...@hyperactivesw.comwrote: On 2/22/14, 12:17 PM, Peter Haworth wrote: I think this is dependant on the Variable Preservation setting on the Preferences Script Editor tab. It is, but there's a bug in it somewhere. I use script locals extensively and they always worked until somewhere around version 6.x. After that the values were occasionally lost. Every subsequent version has made the problem worse, and now I lose them so often that I've had to add a reload of the values to almost every handler I'm debugging. Since I can't find a consistent recipe (sometimes they do work) I haven't reported it yet, but it's making my life difficult. All I know is that it happens some time after I change a script, but not every time, so I'm at a loss. -- Jacqueline Landman Gay | jac...@hyperactivesw.com HyperActive Software | http://www.hyperactivesw.com ___ use-livecode mailing list use-livecode@lists.runrev.com Please visit this url to subscribe, unsubscribe and manage your subscription preferences: http://lists.runrev.com/mailman/listinfo/use-livecode ___ use-livecode mailing list use-livecode@lists.runrev.com Please visit this url to subscribe, unsubscribe and manage your subscription preferences: http://lists.runrev.com/mailman/listinfo/use-livecode
Re: Script local variables
Hi Jacque On 23 Feb 2014, at 02:56, J. Landman Gay wrote: It is, but there's a bug in it somewhere. I use script locals extensively and they always worked until somewhere around version 6.x. After that the values were occasionally lost. Every subsequent version has made the problem worse, and now I lose them so often that I've had to add a reload of the values to almost every handler I'm debugging. Since I can't find a consistent recipe (sometimes they do work) I haven't reported it yet, but it's making my life difficult. All I know is that it happens some time after I change a script, but not every time, so I'm at a loss. With everyone's help, I think that I have found a recipe that demonstrates the problem. Perhaps somebody else could try it. I build a simple stack with a scrolling field (Field) and a button (Button). The stack script is this: local tMyScriptLocal1 local tMyScriptLocal2 = ghijk local tMyScriptLocal3 on openStack put abcde into tMyScriptLocal1 end openStack command initLocal3 put lmnop into tMyScriptLocal3 end initLocal3 on buttonClick initLocal3 put tMyScriptLocal1 linefeed after Field Field put tMyScriptLocal2 linefeed after Field Field put tMyScriptLocal3 linefeed after Field Field end buttonClick The Button script is this: on mouseUp buttonClick end mouseUp If you run the script in the IDE, a button click will display: abcde ghijk lmnop Now Save As Standalone and then click the button again. It will display: ghijk lmnop If somebody can confirm this behaviour, I will submit it to the QA Centre (either adding it to the existing report or adding a new one). Regards Peter ___ use-livecode mailing list use-livecode@lists.runrev.com Please visit this url to subscribe, unsubscribe and manage your subscription preferences: http://lists.runrev.com/mailman/listinfo/use-livecode
Re: Script local variables
On 2/22/14, 6:49 PM, Peter W A Wood wrote: local tMyScriptLocal1 local tMyScriptLocal2 = ghijk local tMyScriptLocal3 I'm not sure it's a fair test. As far as I know, you can't assign a value to a script local that way, though you can if it's a constant. Actually, I'm kind of surprised it works in the IDE. -- Jacqueline Landman Gay | jac...@hyperactivesw.com HyperActive Software | http://www.hyperactivesw.com ___ use-livecode mailing list use-livecode@lists.runrev.com Please visit this url to subscribe, unsubscribe and manage your subscription preferences: http://lists.runrev.com/mailman/listinfo/use-livecode
Re: Script local variables
Uh, oh -- I do this all the time. Is this really not supposed to work? Regards, Scott Rossi Creative Director Tactile Media, UX/UI Design On 2/22/14 6:04 PM, J. Landman Gay jac...@hyperactivesw.com wrote: local tMyScriptLocal1 local tMyScriptLocal2 = ghijk local tMyScriptLocal3 I'm not sure it's a fair test. As far as I know, you can't assign a value to a script local that way, though you can if it's a constant. Actually, I'm kind of surprised it works in the IDE. ___ use-livecode mailing list use-livecode@lists.runrev.com Please visit this url to subscribe, unsubscribe and manage your subscription preferences: http://lists.runrev.com/mailman/listinfo/use-livecode
Re: Script local variables
Scott- Saturday, February 22, 2014, 6:26:31 PM, you wrote: Uh, oh -- I do this all the time. Is this really not supposed to work? It sometimes works, but it's not legal syntax. I don't know of any particular reason why not, but it's not. -- -Mark Wieder ahsoftw...@gmail.com This communication may be unlawfully collected and stored by the National Security Agency (NSA) in secret. The parties to this email do not consent to the retrieving or storing of this communication and any related metadata, as well as printing, copying, re-transmitting, disseminating, or otherwise using it. If you believe you have received this communication in error, please delete it immediately. ___ use-livecode mailing list use-livecode@lists.runrev.com Please visit this url to subscribe, unsubscribe and manage your subscription preferences: http://lists.runrev.com/mailman/listinfo/use-livecode
Re: Script local variables
Well, I didn't *think* it was allowed. I confess I never used script locals that way. If I need to assign a permanent value, I use a constant: constant kVar = 1234 If the IDE accomodates script locals with assignments, then maybe something changed. Apparently it doesn't work in standalones. Or maybe this is a clue to the larger issue of lost script locals. On 2/22/14, 8:26 PM, Scott Rossi wrote: Uh, oh -- I do this all the time. Is this really not supposed to work? Regards, Scott Rossi Creative Director Tactile Media, UX/UI Design On 2/22/14 6:04 PM, J. Landman Gay jac...@hyperactivesw.com wrote: local tMyScriptLocal1 local tMyScriptLocal2 = ghijk local tMyScriptLocal3 I'm not sure it's a fair test. As far as I know, you can't assign a value to a script local that way, though you can if it's a constant. Actually, I'm kind of surprised it works in the IDE. ___ use-livecode mailing list use-livecode@lists.runrev.com Please visit this url to subscribe, unsubscribe and manage your subscription preferences: http://lists.runrev.com/mailman/listinfo/use-livecode -- Jacqueline Landman Gay | jac...@hyperactivesw.com HyperActive Software | http://www.hyperactivesw.com ___ use-livecode mailing list use-livecode@lists.runrev.com Please visit this url to subscribe, unsubscribe and manage your subscription preferences: http://lists.runrev.com/mailman/listinfo/use-livecode
Re: Script local variables
I take it back. The dictionary says you can do it. Whaddya know. On 2/22/14, 8:26 PM, Scott Rossi wrote: Uh, oh -- I do this all the time. Is this really not supposed to work? Regards, Scott Rossi Creative Director Tactile Media, UX/UI Design On 2/22/14 6:04 PM, J. Landman Gay jac...@hyperactivesw.com wrote: local tMyScriptLocal1 local tMyScriptLocal2 = ghijk local tMyScriptLocal3 I'm not sure it's a fair test. As far as I know, you can't assign a value to a script local that way, though you can if it's a constant. Actually, I'm kind of surprised it works in the IDE. ___ use-livecode mailing list use-livecode@lists.runrev.com Please visit this url to subscribe, unsubscribe and manage your subscription preferences: http://lists.runrev.com/mailman/listinfo/use-livecode -- Jacqueline Landman Gay | jac...@hyperactivesw.com HyperActive Software | http://www.hyperactivesw.com ___ use-livecode mailing list use-livecode@lists.runrev.com Please visit this url to subscribe, unsubscribe and manage your subscription preferences: http://lists.runrev.com/mailman/listinfo/use-livecode
Re: Script local variables
On 2/22/14, 8:42 PM, Mark Wieder wrote: Scott- Saturday, February 22, 2014, 6:26:31 PM, you wrote: Uh, oh -- I do this all the time. Is this really not supposed to work? It sometimes works, but it's not legal syntax. I don't know of any particular reason why not, but it's not. They must have changed it when you and I weren't looking. Variable assignments are even listed in the examples in the dictionary entry for local. I may have to read the whole dictionary again to see what else I've missed. I may also have found a clue to disappearing locals. The same entry says this: If variable preservation is turned on, script locals retain their values when the script is re-compiled, unless there is an error in the script. I'm quite sure I've produced enough errors to have destroyed a few script locals in my time, so maybe that's what's wrong. I'll try to pay more attention. -- Jacqueline Landman Gay | jac...@hyperactivesw.com HyperActive Software | http://www.hyperactivesw.com ___ use-livecode mailing list use-livecode@lists.runrev.com Please visit this url to subscribe, unsubscribe and manage your subscription preferences: http://lists.runrev.com/mailman/listinfo/use-livecode
