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Articles indexed in March 2010

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  • How to sort a list so that managers are always ahead of their subordinates

    - by James Black
    I am working on a project using Groovy, and I would like to take an array of employees, so that no manager follows their subordinates in the array. The reason being that I need to add people to a database and I would prefer not to do it in two passes. So, I basically have: <employees> <employee> <employeeid>12</employeeid> <manager>3</manager> </employee> <employee> <employeeid>1</employeeid> <manager></manager> </employee> <employee> <employeeid>3</employeeid> <manager>1</manager> </employee> </employees> So, it should be sorted as such: employeeid = 1 employeeid = 3 employeeid = 12 The first person should have a null for managers. I am thinking about a binary tree representation, but I expect it will be very unbalanced, and I am not certain the best way to do this using Groovy properly. Is there a way to do this that isn't going to involve using nested loops?

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  • OS X firewall popup about growlnotify keeps popping up

    - by Vitaly Kushner
    I have autotest setup with growlnotify using growl_glue (version 1.0.7): require 'growl_glue' GrowlGlue::Autotest.initialize do |config| config.notification :use_network_notifications => true end growl version is 1.2 each time autotest runs and displays the notification growl popup I also get an OS X firewall popup asking Do you want the application "growlnotify" to accept incoming network connections? I tried answering deny and allow but it still keeps popping up. the deny/allow choice is properly reflected in System Preferences - Security - Firewall - 'application access list', but it still asks every time. update I ended up using autotest-growl gem instead of the growl_glue. it fixed the problem, it was probably related to how growl_glue was calling growlnotify.

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  • Succinct introduction to C++/CLI for C#/Haskell/F#/JS/C++/... programmer

    - by Henrik
    Hello everybody, I'm trying to write integrations with the operating system and with things like active directory and Ocropus. I know a bunch of programming languages, including those listed in the title. I'm trying to learn exactly how C++/CLI works, but can't find succinct, exact and accurate descriptions online from the searching that I have done. So I ask here. Could you tell me the pitfalls and features of C++/CLI? Assume I know all of C# and start from there. I'm not an expert in C++, so some of my questions' answers might be "just like C++", but could say that I am at C#. I would like to know things like: Converting C++ pointers to CLI pointers, Any differences in passing by value/doubly indirect pointers/CLI pointers from C#/C++ and what is 'recommended'. How do gcnew, __gc, __nogc work with Polymorphism Structs Inner classes Interfaces The "fixed" keyword; does that exist? Compiling DLLs loaded into the kernel with C++/CLI possible? Loaded as device drivers? Invoked by the kernel? What does this mean anyway (i.e. to load something into the kernel exactly; how do I know if it is?)? L"my string" versus "my string"? wchar_t? How many types of chars are there? Are we safe in treating chars as uint32s or what should one treat them as to guarantee language indifference in code? Finalizers (~ClassName() {}) are discouraged in C# because there are no garantuees they will run deterministically, but since in C++ I have to use "delete" or use copy-c'tors as to stack allocate memory, what are the recommendations between C#/C++ interactions? What are the pitfalls when using reflection in C++/CLI? How well does C++/CLI work with the IDisposable pattern and with SafeHandle, SafeHandleZeroOrMinusOneIsInvalid? I've read briefly about asynchronous exceptions when doing DMA-operations, what are these? Are there limitations you impose upon yourself when using C++ with CLI integration rather than just doing plain C++? Attributes in C++ similar to Attributes in C#? Can I use the full meta-programming patterns available in C++ through templates now and still have it compile like ordinary C++? Have you tried writing C++/CLI with boost? What are the optimal ways of interfacing the boost library with C++/CLI; can you give me an example of passing a lambda expression to an iterator/foldr function? What is the preferred way of exception handling? Can C++/CLI catch managed exceptions now? How well does dynamic IL generation work with C++/CLI? Does it run on Mono? Any other things I ought to know about?

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  • How to check if datetime is older than 20 seconds.

    - by Jelle
    Hello! This is my first time here so I hope I post this question at the right place. :) I need to build flood control for my script but I'm not good at all this datetime to time conversions with UTC and stuff. I hope you can help me out. I'm using the Google App Engine with Python. I've got a datetimeproperty at the DataStore database which should be checked if it's older than 20 seconds, then proceed. Could anybody help me out? So in semi-psuedo: q = db.GqlQuery("SELECT * FROM Kudo WHERE fromuser = :1", user) lastplus = q.get() if lastplus.date is older than 20 seconds: print"Go!"

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  • Why does IE prompt a security warning when viewing an XML file?

    - by Tav
    Opening an XML file in Internet explorer gives a security warning. IE has a nice collapsible tree view for viewing XML, but it's disabled by default and you get this scary error message about a potential security hole. http://www.leonmeijer.nl/archive/2008/04/27/106.aspx But why? How can simply viewing an XML file (not running any embedded macros in it or anything) possibly be a security hole? Sure, I get that running XSLT could potentially do some bad stuff, but we're not talking about executing anything. We're talking about viewing. Why can't IE simply display the XML file as text (plus with the collapsible tree viewer)? So why did they label this as a security hole? Can someone describe how simply viewing an XML document could be used as an attack document?

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  • Python 3.1.1 Class Question

    - by Protean
    I'm a new Python programmer who is having a little trouble using 'self' in classes. For example: class data: def __init__(self): self.table = [] def add(self, file): self.table.append(file) data.add('yes') In this function I want to have table be a variable stored in the class data and use add to modify it. However, when I run this script it gives me the error: Traceback (most recent call last): File "/Projects/Python/sfdfs.py", line 7, in <module> data.add('yes') TypeError: add() takes exactly 2 positional arguments (1 given) I assume that I am trying to call the function the wrong way in this instance, as this syntax is very similar to an example in the python documentation: http://docs.python.org/3.1/tutorial/classes.html

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  • Virtualmin install failing on Rackspace Debian 5.0

    - by Rob
    Hi - Running the install.sh script as-is from Virtualmin (GPL version), I get a dovecot error after about 5.5mins of installation. I have tried this on several versions of the server - same error whether or not I run apt-get update +/- apt-get upgrade .... and whether or not I have the FQDN set. Here's the end of the installation: http://screencast.com/t/ZDkxMmY1NDQ Any hints/suggestions, etc. would be much appreciated... Thanks, Rob

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  • HP ML350G6 running hyper-V 2008 r2 resets itself every 2 hours

    - by GT
    The system started resetting itself exactly every 2 hours. These are the messages in the iLO2 log: Informational iLO 2 03/07/2010 20:40 03/07/2010 20:40 1 Server power restored. Caution iLO 2 03/07/2010 20:40 03/07/2010 20:40 1 Server reset. It's not an ASR reset (that would show in the log) Redundant power supplies, swapped but no change. Turned off all virtual machines (i.e. now only running hypervisor) but not OK Boot HP smartstart diagnostics disk, ALL OK Diagnostic disk reports no errors Went back to booting Hypervisor and the problem is back. Seems the hyper-V system disk has got a time based program (virus) causing the reset. I thought the hypervisor had a small attack surface and should be OK. All virtual machines (SBS2008, Win7 and Win XP) and network computers are protected with TrendMicro WFBS. I am about to rebuild the disk (I have backups) but wondered if there were any suggestions to try first???

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  • Troubleshooting PC

    - by srand
    After playing PC games after a few hours I decided to take a break. When I opened up My Computer in Windows 7 I noticed I one of my drives had disappeared. Thinking it was just a glitch, I tried to restart. Upon restart, the BIOS took forever to get through (I didn't notice my disappeared hard drive in the listed drives) and the computer seemed stuck at the "Start Windows" screen. I hard shut down everything. Opened up the case, used canned air to clear the dust out and made sure all devices were snugly in place. I hooked everything up and powered on. This time, after a few seconds the computer restarted (nothing showed up on screen either). After its restart, the computer didn't do anything. The hard drive indicator light was on the whole time. What happened? :( PC Specs: Windows 7, 3GB RAM, Core 2 Duo, 3 Hard drives

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  • tweak windows 7 virtual memory and cache / caching settings

    - by bortao
    im on windows 7 64 bit, with 4gb of memory whenever i copy or deal with a big ammount of data, windows swaps out everything from memory to the virtual memory swapfile, to make room to data cache. the problem is: i dont really need caching of this data im copying, its being copied only once, cacheing this data won't help me. on the other hand, swapping out the programs will give me a big lag time whenever i want to use those open programs again. what i want: restrict data cache to a certain ammount, lets say 1gb, or reserve a certain ammount of memory, lets say 2gb, exclusively for running programs memory. my swap file is on a separate partition, but i still have problems with swapping time.

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  • How to reset video/display drivers in Vista without restarting OS?

    - by jdk
    Currently I have to reboot my system if an external monitor is hooked up for it to be correctly detected and used. I think it would be faster to restart/reset the video or display drivers instead. How do I do this under Vista? I seem to remember from an old laptop using a Windows command-line command that would restart the wireless networking card device when it crashed. Is there something like that for video drivers? Background/Reason Because people rightfully ask why? - This is part of a larger problem which I'm waiting for resolution on from the manufacturer. In the meantime I'm looking for the above quick fix. Actually my video card often crashes my laptop when attaching an external monitor and trying to detect or use it. No solution from vendor yet and latest drivers do the same irksome behaviour. Windows says: A problem with your video hardware caused Windows to stop working correctly.

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  • Python web server

    - by Ben
    Hi I'd like to get suggestions on the best way to serve python scripts up as web pages. Typically I'd like a way for me and my colleagues to write simple web pages with minimal effort ie we focus on the business logic eg creating simple forms etc. Possibly with some way to manage sessions but this is a nice-to-have. It doesn't have to be WYSIWYG as they are developers but we are busy and don't want to spend long turning an idea into reality. It's for internal use so appearances are not paramount. The software required to enable this should be easy to setup and configure. eg adding new directories and python lib dirs should be easy. My first instinct is apache or tomcat with mod_python. Any comments / suggestions welcome. Thanks in advance.

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  • Why are my "tel:" links not working

    - by Griffo
    I have a tableView which has cells with phone numbers. The app is not dialing the numbers though. See the code below - (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath { if (indexPath.section == 2) { UITableViewCell *selectedCell = [tableView cellForRowAtIndexPath:indexPath]; NSString *numberToDial = [NSString stringWithFormat:@"tel:%@", selectedCell.detailTextLabel.text]; NSLog(@"%@",numberToDial); [[UIApplication sharedApplication] openURL:[NSURL URLWithString:numberToDial]]; } } Console ouput: 2010-03-08 01:32:30.830 AIB[1217:207] tel:01 8350098 As you can see, the number goes to the console, but doesn't get dialled. The weird thing is, if I change the last statement to this: [[UIApplication sharedApplication] openURL:[NSURL URLWithString:@"tel:171"]]; the phone dials the number 171 without any issue

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  • Is perl's each function worth using?

    - by eugene y
    From perldoc -f each we read: There is a single iterator for each hash, shared by all each, keys, and values function calls in the program; it can be reset by reading all the elements from the hash, or by evaluating keys HASH or values HASH. The iterator is not reset when you leave the scope containing the each(), and this can lead to bugs: my %h = map { $_, 1 } qw(1 2 3); while (my $k = each %h) { print "1: $k\n"; last } while (my $k = each %h) { print "2: $k\n" } Output: 1: 1 2: 3 2: 2 What are the common workarounds for this behavior? And is it worth using each in general?

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  • jQuery test if element1 is child of element2

    - by Jake
    Does anyone know a good way to test if one element, stored in a var, is the child of another, also stored in a var? I don't need element1.isChildOf('selector'), that's easy. I need element1.isChildOf(element2) element2.find(element1).size() > 0 Does not seem to work. I don't want to have to write a plugin the uses .each to test each child if I can avoid it.

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  • How to get `gcc` to generate `bts` instruction for x86-64 from standard C?

    - by Norman Ramsey
    Inspired by a recent question, I'd like to know if anyone knows how to get gcc to generate the x86-64 bts instruction (bit test and set) on the Linux x86-64 platforms, without resorting to inline assembly or to nonstandard compiler intrinsics. Related questions: Why doesn't gcc do this for a simple |= operation were the right-hand side has exactly 1 bit set? How to get bts using compiler intrinsics or the asm directive Portability is more important to me than bts, so I won't use and asm directive, and if there's another solution, I prefer not to use compiler instrinsics. EDIT: The C source language does not support atomic operations, so I'm not particularly interested in getting atomic test-and-set (even though that's the original reason for test-and-set to exist in the first place). If I want something atomic I know I have no chance of doing it with standard C source: it has to be an intrinsic, a library function, or inline assembly. (I have implemented atomic operations in compilers that support multiple threads.)

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  • Is it possible to reliably auto-decode user files to Unicode? [C#]

    - by NVRAM
    I have a web application that allows users to upload their content for processing. The processing engine expects UTF8 (and I'm composing XML from multiple users' files), so I need to ensure that I can properly decode the uploaded files. Since I'd be surprised if any of my users knew their files even were encoded, I have very little hope they'd be able to correctly specify the encoding (decoder) to use. And so, my application is left with task of detecting before decoding. This seems like such a universal problem, I'm surprised not to find either a framework capability or general recipe for the solution. Can it be I'm not searching with meaningful search terms? I've implemented BOM-aware detection (http://en.wikipedia.org/wiki/Byte_order_mark) but I'm not sure how often files will be uploaded w/o a BOM to indicate encoding, and this isn't useful for most non-UTF files. My questions boil down to: Is BOM-aware detection sufficient for the vast majority of files? In the case where BOM-detection fails, is it possible to try different decoders and determine if they are "valid"? (My attempts indicate the answer is "no.") Under what circumstances will a "valid" file fail with the C# encoder/decoder framework? Is there a repository anywhere that has a multitude of files with various encodings to use for testing? While I'm specifically asking about C#/.NET, I'd like to know the answer for Java, Python and other languages for the next time I have to do this. So far I've found: A "valid" UTF-16 file with Ctrl-S characters has caused encoding to UTF-8 to throw an exception (Illegal character?) (That was an XML encoding exception.) Decoding a valid UTF-16 file with UTF-8 succeeds but gives text with null characters. Huh? Currently, I only expect UTF-8, UTF-16 and probably ISO-8859-1 files, but I want the solution to be extensible if possible. My existing set of input files isn't nearly broad enough to uncover all the problems that will occur with live files. Although the files I'm trying to decode are "text" I think they are often created w/methods that leave garbage characters in the files. Hence "valid" files may not be "pure". Oh joy. Thanks.

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  • How to save video from a url to disk, also how to begin playback after some buffering?

    - by Shizam
    First question is, given a url to an mp4 video, how can I save that file to disk? The followup to that is while its saving, can I begin playback after its buffered some of the video to disk or do I have to wait for the entire file to be written and then: MPMoviePlayerController* theMovie=[[MPMoviePlayerController alloc] initWithContentURL:theURL]; using the path to the local file. Thanks, Sam

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  • IP not Pinging!

    - by Paddy
    I have an apache server running on Mac. i had windows before on the same machine and i had apache running there too. i could access my public sites by just typing in my ip in the web browser. now its not working. its working with localhost though!!!

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  • Tree View / File View Control for C#

    - by Jason
    I have been looking for a C# tree control for displaying a file system that has the following capabilities: Select a starting directory. I don't always want to start at a "default" top directory level. The ability to grab an event when the user double clicks on a file in the tree. I want to handle opening the file within my application. I have been looking at this C# File Browser. Unfortunately, I have not been able to figure out how to do meet my second need. (If anybody can clear that up for me, I would like that even better.) Thanks for any help.

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  • Doxygen C++ comment string parser in python?

    - by Sebastian
    Does anybody know of a python module to parse a doxygen style C++ comment string? I mean a string like this (simple example): /** * A constructor. * A more elaborate description of the constructor. * @param param1 test1 * @param param2 test2 */ and I would like to extract the brief, the long description, the parameters, the return value etc. I'm currently doing this using string methods and regular expressions but my solution is not very robust. Alternatively does anybody know an easy to use parser lib that I can set up quickly? Thanks in advance

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