Corrupted stack/heap under debugger when simulating? - xcode

I'm using Xcode 6.3.1. I'm trying to track a weird issue in an app and now I'm seeing that local variables seem to be incorrectly initialised. When I hit a breakpoint at the line where a local variable is defined and initialised at the same time, it is actually shown as an existing local variable, but with a corrupt value:
Has anyone else seen this? In another run the variable was actually showing in the variable view as being an NSDate !!!

A breakpoint is actually before the line it appears on; that line has not yet executed. You are thus looking too soon at this variable. It has no meaningful value until after you step past the line where it is initialized. You are still before that line so its value is random garbage.

Related

WebSphere: Unable to change both stderrfilname and stdoutfilename at same time

In WebSphere Application Server 8.5.5 I'm having problems setting the native_stdout and native_stderr log paths from wsadmin jython script.
Everytime I set one path, the other is blanked out. i.e. set to null.
I presume I need to form a line of code that sets both paths simultaneously but have been unable to create the correct syntax, if this is at all possible.
The code to produce one path change looks like:
srv = AdminConfig.getid('/Cell:mycell/Node:mynode/Server:server1/')
processDef = AdminConfig.list('JavaProcessDef', srv)
AdminConfig.modify(processDef, [['ioRedirect', [['stderrFilename', '${LOG_ROOT}/server1/new_stderr.log']]]])
AdminConfig.save()
This works fine but when I then use the same script to set the stdoutFilename, it blanks the stderrFilename previously set.
It seems to make no difference at which point I commit the changes using save.
Any help with this issue would be greatly received!
You're right, even though the manual elsewhere warns that AdminConfig.modify() might append to lists when you don't expect it to. I observed the same thing.
Here's the pattern you want to be safe, clear it out and set both properties at the same time:
AdminConfig.modify(processDef, [['ioRedirect', []]])
AdminConfig.modify(processDef, [['ioRedirect', [['stderrFilename', '${SERVER_LOG_ROOT}/my_stderr.log'], ['stdoutFilename', '${SERVER_LOG_ROOT}/my_stdout.log']]]])
After this, you can do this for a simple verification:
print AdminConfig.showall(processDef)
But watch the output closely as it is not pretty-printed

Object name becoming lowercase

I have some code which has worked in multiple installations for about a year. Today im doing a small change to a control and then another control seems to have developed an issue. When at runtime im getting a 91 error object variable or with block variable not set.
I therefore looked at the problem line which is: -
If Screen.ActiveForm.name = "frmFoutmelding" Then Exit Sub
so I noticed the name was lowercase. if i delete .name and rehit the "dot" then it shows me i can use .Name but as soon as i move from this line it drops back to .name
I've checked for instances of name and it appears everywhere in the code in different modules but i cant find if i have accidentally defined this lowercase name anywhere?
Googling doesn't seem to show much but i feel Im googling the wrong terms
chaps - thanks for your suggestions - this was the first instance of the lowercase name and searching as Jim suggested didn't reveal anything I'm afraid. What I did discover was that this was suddenly being run before any forms had actually been displayed and so the count was 0. I therefore, did an on error to check the form count and exit the sub if it =0 then if not to carry on with the line I thought I was having issues with.
It's likely that you did create a new variable or property called (lower case) name, or that some included reference did the same. It's possible to use reserved words as variable names in some cases, but it requires taking specific steps.
I would first search your code for instances of name As to see if you created a variable (this assumes you use Option Explicit, which is a must IMO). Then search for Property*name with * as a wildcard.
If those fail you could try unchecking references or components to see if any of them define name. If none of that finds anything, please post back here.
Jim Mack covers a lot of the potential issues. I think another is if you typed a lower case '.name' in association with Activeform at some point earlier in the same code module - the VB6 IDE checks in the current module and uses that to define what case to use. Look further up the same code module (sub or function).
Ultimately, check what changes you made by comparing the old source to the new in a file comparison tool like windiff - you do have backups, right?

(Koala) Can't compile variables in Sass

It's my first time using Koala.
Everything works fine so far, but when I want to use variables it starts giving me errors. I really don't know what I'am doing wrong, cause I followed all steps.
For example:
$test: #00000; would give me error (doesn't matter in which .scss file I put it in.
I have uploaded a screenshot of my structure and the error.
The actual problem with the code is that you supplied 5 digits for the value of a hexadecimal value.
You should either use 3 or 6 and not 5
$test: #000000; // not #00000
The reason why it worked by not importing _variables.scss is because it is a partial file and by not importing it, it never gets compiled and so it basically doesn't evaluate the line causing the error. That line is just ignored.

Rstudio difference between run and source

I am using Rstudio and not sure how options "run" and "source" are different.
I tried googling these terms but 'source' is a very common word and wasn't able to get good search results :(
Run and source have subtly different meanings. According to the RStudio documentation,
The difference between running lines from a selection and invoking
Source is that when running a selection all lines are inserted
directly into the console whereas for Source the file is saved to a
temporary location and then sourced into the console from there
(thereby creating less clutter in the console).
Something to be aware of, is that sourcing functions in files makes them available for scripts to use. What does this mean? Imagine you are trying to troubleshoot a function that is called from a script. You need to source the file containing the function, to make the changes available in the function be used when that line in the script is then run.
A further aspect of this is that you can source functions from your scripts. I use this code to automatically source all of the functions in a directory, which makes it easy to run a long script with a single run:
# source our functions
code.dir <- "c:\temp"
code.files = dir(code.dir, pattern = "[.r]")
for (file in code.files){
source(file = file.path(code.dir,file))
}
Sometimes, for reasons I don't understand, you will get different behavior depending on whether you select all the lines of code and press the run the button or go to code menu and chose 'source.' For example, in one specific case, writing a gplot to a png file worked when I selected all my lines of code but the write failed to when I went to the code menu and chose 'source.' However, if I choose 'Source with Echo,' I'm able to print to a png file again.
I'm simply reporting a difference here that I've seen between the selecting and running all your lines and code and going to code menu and choosing 'source,' at least in the case when trying to print a gplot to a png file.
An important implication of #AndyClifton's answer is:
Rstudio breakpoints work in source (Ctrl-Shift-S) but not in run (Ctrl-Enter)
Presumably the reason is that with run, the code is getting passed straight into the console with no support for a partial submission.
You can still use browser() though with run though.
print() to console is supported in debugSource (Ctrl-Shift-S) as well as run.
The "run" button simply executes the selected line or lines. The "source" button will execute the entire active document. But why not just try them and see the difference?
I also just discovered that the encoding used to read the function sourced can also be different if you source the file or if you add the function of the source file to your environment with Ctrl+Enter!
In my case there was a regex with a special character (ยต) in my function. When I imported the function directly (Ctrl+Enter) everything would work, while I had an error when sourcing the file containing this function.
To solve this issue I specified the encoding of the sourced file in the source function (source("utils.R", encoding = "UTF-8")).
Run will run each line of code, which means that it hits enter at the beginning of each line, which prints the output to the console. Source won't print anything unless you source with echo, which means that ggplot won't print to pngs, as another posted mentioned.
A big practical difference between run and source is that if you get an unaccounted for error in source it'll break you out of the code without finishing, whereas run will just pass the next line to the console and keep going. This has been the main practical difference I've seen working on cleaning up other people's scripts.
When using RSTudio u can press the run button in the script section - it will run the selected line.
Next to it you have the re - run button, to run the line again. and the source button next to it will run entire chuncks of code.
I found a video about this topic:
http://www.youtube.com/watch?v=5YmcEYTSN7k
Source/Source with echo is used to execute the whole file whereas Run as far as my personal experience goes executes the line in which your cursor is present.
Thus, Run helps you to debug your code. Watch out for the environment. It will display what's happening in the stack.
To those saying plots do not show. They won't show in Plots console. But you can definitely save the plot to disc using Source in RStudio. Using this snippet:
png(filename)
print(p)
dev.off()
I can confirm plots are written to disc. Furthermore print statements are also outputted to the console

Zip command in ruby block does not work without binding.pry

I have a block of code that executes a zip command from another class:
def zip_up_contents path name
Zipper.new path name
end
The problem is that it zips blank copies of all the files passed to it. But when I put a binding before the zip command like so:
def zip_up_contents path name
binding.pry
Zipper.new path name
binding.pry
end
it zips the files successfully. I know this by checking the resulting file's byte size from within pry on the second binding point with and without the first binding present. Without the binding, the zip archive's byte size is half what it should be, and with the binding it's the size I would expect.
The "Zipper" class simply calls the system zip with backticks. I don't think that's the problem because I've used that class without trouble in other contexts. The zip utility is Zip 3.0 on Ubuntu 10.04.
I have no idea why the presence of the binding makes a difference. If anyone has encountered anything similar, or has thoughts about how to better debug the issue, I'd appreciate hearing about it.
EDIT: For anyone encountering anything similar, I resolved this by calling fsync on the files prior to zipping them: http://www.ruby-doc.org/core-2.0.0/IO.html#method-i-fsync
I had this problem with some Rspec tests last week -- turned out to be a race condition. Is there any chance that the file hasn't been saved when you pass it to be zipped? I mean, maybe the binding.pry is just giving it a chance to catch up.

Resources