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  • How to resolve %CommonProgramFiles%\system\

    - by Faisal
    I have a situation where I need to return a directory path by reading the registry settings. Registry value returns me a path in the format %CommonProgramFiles%\System\web32.dll while the consumer code is expecting it in the format C:\Program Files\Common Files\System\web32.dll How can I resolve such directory path in .net code?

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  • RHEL Cluster FAIL after changing time on system

    - by Eugene S
    I've encountered a strange issue. I had to change the time on my Linux RHEL cluster system. I've done it using the following command from the root user: date +%T -s "10:13:13" After doing this, some message appeared relating to <emerg> #1: Quorum Dissolved however I didn't capture it completely. In order to investigate the issue I looked at /var/log/messages and I've discovered the following: Mar 22 16:40:42 hsmsc50sfe1a openais[25715]: [TOTEM] entering GATHER state from 0. Mar 22 16:40:42 hsmsc50sfe1a openais[25715]: [TOTEM] Creating commit token because I am the rep. Mar 22 16:40:42 hsmsc50sfe1a openais[25715]: [TOTEM] Storing new sequence id for ring 354 Mar 22 16:40:42 hsmsc50sfe1a openais[25715]: [TOTEM] entering COMMIT state. Mar 22 16:40:42 hsmsc50sfe1a openais[25715]: [TOTEM] entering RECOVERY state. Mar 22 16:40:42 hsmsc50sfe1a openais[25715]: [TOTEM] position [0] member 192.168.1.49: Mar 22 16:40:42 hsmsc50sfe1a openais[25715]: [TOTEM] previous ring seq 848 rep 192.168.1.49 Mar 22 16:40:42 hsmsc50sfe1a openais[25715]: [TOTEM] aru 61 high delivered 61 received flag 1 Mar 22 16:40:42 hsmsc50sfe1a openais[25715]: [TOTEM] Did not need to originate any messages in recovery. Mar 22 16:40:42 hsmsc50sfe1a openais[25715]: [TOTEM] Sending initial ORF token Mar 22 16:40:42 hsmsc50sfe1a openais[25715]: [CLM ] CLM CONFIGURATION CHANGE Mar 22 16:40:42 hsmsc50sfe1a openais[25715]: [CLM ] New Configuration: Mar 22 16:40:42 hsmsc50sfe1a openais[25715]: [CLM ] #011r(0) ip(192.168.1.49) Mar 22 16:40:42 hsmsc50sfe1a openais[25715]: [CLM ] Members Left: Mar 22 16:40:42 hsmsc50sfe1a openais[25715]: [CLM ] #011r(0) ip(192.168.1.51) Mar 22 16:40:42 hsmsc50sfe1a openais[25715]: [CLM ] Members Joined: Mar 22 16:40:42 hsmsc50sfe1a openais[25715]: [CMAN ] quorum lost, blocking activity Mar 22 16:40:42 hsmsc50sfe1a openais[25715]: [CLM ] CLM CONFIGURATION CHANGE Mar 22 16:40:42 hsmsc50sfe1a openais[25715]: [CLM ] New Configuration: Mar 22 16:40:42 hsmsc50sfe1a openais[25715]: [CLM ] #011r(0) ip(192.168.1.49) Mar 22 16:40:42 hsmsc50sfe1a openais[25715]: [CLM ] Members Left: Mar 22 16:40:42 hsmsc50sfe1a openais[25715]: [CLM ] Members Joined: Mar 22 16:40:42 hsmsc50sfe1a openais[25715]: [SYNC ] This node is within the primary component and will provide service. Mar 22 16:40:42 hsmsc50sfe1a openais[25715]: [TOTEM] entering OPERATIONAL state. Mar 22 16:40:42 hsmsc50sfe1a kernel: dlm: closing connection to node 2 Mar 22 16:40:42 hsmsc50sfe1a openais[25715]: [CLM ] got nodejoin message 192.168.1.49 Mar 22 16:40:42 hsmsc50sfe1a clurgmgrd[25809]: <emerg> #1: Quorum Dissolved Mar 22 16:40:42 hsmsc50sfe1a openais[25715]: [CPG ] got joinlist message from node 1 Mar 22 16:40:42 hsmsc50sfe1a ccsd[25705]: Cluster is not quorate. Refusing connection. Mar 22 16:40:42 hsmsc50sfe1a ccsd[25705]: Error while processing connect: Connection refused Mar 22 16:40:42 hsmsc50sfe1a ccsd[25705]: Invalid descriptor specified (-21). Mar 22 16:40:42 hsmsc50sfe1a ccsd[25705]: Someone may be attempting something evil. Mar 22 16:40:42 hsmsc50sfe1a ccsd[25705]: Error while processing disconnect: Invalid request descriptor Mar 22 16:40:42 hsmsc50sfe1a openais[25715]: [TOTEM] entering GATHER state from 9. Mar 22 16:40:42 hsmsc50sfe1a openais[25715]: [TOTEM] Creating commit token because I am the rep. Mar 22 16:40:42 hsmsc50sfe1a openais[25715]: [TOTEM] Storing new sequence id for ring 358 Mar 22 16:40:42 hsmsc50sfe1a openais[25715]: [TOTEM] entering COMMIT state. Mar 22 16:40:42 hsmsc50sfe1a openais[25715]: [TOTEM] entering RECOVERY state. Mar 22 16:40:42 hsmsc50sfe1a openais[25715]: [TOTEM] position [0] member 192.168.1.49: Mar 22 16:40:42 hsmsc50sfe1a openais[25715]: [TOTEM] previous ring seq 852 rep 192.168.1.49 Mar 22 16:40:42 hsmsc50sfe1a openais[25715]: [TOTEM] aru f high delivered f received flag 1 Mar 22 16:40:42 hsmsc50sfe1a openais[25715]: [TOTEM] position [1] member 192.168.1.51: Mar 22 16:40:42 hsmsc50sfe1a openais[25715]: [TOTEM] previous ring seq 852 rep 192.168.1.51 Mar 22 16:40:42 hsmsc50sfe1a openais[25715]: [TOTEM] aru f high delivered f received flag 1 Mar 22 16:40:42 hsmsc50sfe1a openais[25715]: [TOTEM] Did not need to originate any messages in recovery. Mar 22 16:40:42 hsmsc50sfe1a openais[25715]: [TOTEM] Sending initial ORF token Mar 22 16:40:42 hsmsc50sfe1a openais[25715]: [CLM ] CLM CONFIGURATION CHANGE Mar 22 16:40:42 hsmsc50sfe1a openais[25715]: [CLM ] New Configuration: Mar 22 16:40:42 hsmsc50sfe1a openais[25715]: [CLM ] #011r(0) ip(192.168.1.49) Mar 22 16:40:42 hsmsc50sfe1a openais[25715]: [CLM ] Members Left: Mar 22 16:40:42 hsmsc50sfe1a openais[25715]: [CLM ] Members Joined: Mar 22 16:40:42 hsmsc50sfe1a openais[25715]: [CLM ] CLM CONFIGURATION CHANGE Mar 22 16:40:42 hsmsc50sfe1a openais[25715]: [CLM ] New Configuration: Mar 22 16:40:42 hsmsc50sfe1a openais[25715]: [CLM ] #011r(0) ip(192.168.1.49) Mar 22 16:40:42 hsmsc50sfe1a openais[25715]: [CLM ] #011r(0) ip(192.168.1.51) Mar 22 16:40:42 hsmsc50sfe1a openais[25715]: [CLM ] Members Left: Mar 22 16:40:42 hsmsc50sfe1a openais[25715]: [CLM ] Members Joined: Mar 22 16:40:42 hsmsc50sfe1a openais[25715]: [CLM ] #011r(0) ip(192.168.1.51) Mar 22 16:40:42 hsmsc50sfe1a openais[25715]: [SYNC ] This node is within the primary component and will provide service. Mar 22 16:40:42 hsmsc50sfe1a openais[25715]: [TOTEM] entering OPERATIONAL state. Mar 22 16:40:42 hsmsc50sfe1a openais[25715]: [MAIN ] Node chb_sfe2a not joined to cman because it has existing state Mar 22 16:40:42 hsmsc50sfe1a openais[25715]: [CLM ] got nodejoin message 192.168.1.49 Mar 22 16:40:42 hsmsc50sfe1a openais[25715]: [CLM ] got nodejoin message 192.168.1.51 Mar 22 16:40:42 hsmsc50sfe1a openais[25715]: [CPG ] got joinlist message from node 1 Mar 22 16:40:42 hsmsc50sfe1a openais[25715]: [CPG ] got joinlist message from node 2 Mar 22 16:40:42 hsmsc50sfe1a ccsd[25705]: Cluster is not quorate. Refusing connection. Mar 22 16:40:42 hsmsc50sfe1a ccsd[25705]: Error while processing connect: Connection refused Mar 22 16:40:42 hsmsc50sfe1a ccsd[25705]: Invalid descriptor specified (-111). Mar 22 16:40:42 hsmsc50sfe1a ccsd[25705]: Someone may be attempting something evil. Mar 22 16:40:42 hsmsc50sfe1a ccsd[25705]: Error while processing get: Invalid request descriptor Mar 22 16:40:42 hsmsc50sfe1a ccsd[25705]: Invalid descriptor specified (-21). Mar 22 16:40:42 hsmsc50sfe1a ccsd[25705]: Someone may be attempting something evil. Mar 22 16:40:42 hsmsc50sfe1a ccsd[25705]: Error while processing disconnect: Invalid request descriptor How could this be related to the time change procedure I performed?

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  • How can I avoid hard-coding YubiKey user identities into the PAM stack?

    - by CodeGnome
    The Yubico PAM Module seems to require changes to the PAM stack for each user that will be authenticated with a YubiKey. Specifically, it seems that each user's client identity must be added to the right PAM configuration file before the user can be authenticated. While it makes sense to add authorized keys to an authentication database such as /etc/yubikey_mappings or ~/.yubico/authorized_yubikeys, it seems like a bad practice to have to edit the PAM stack itself for each individual user. I would definitely like to avoid having to hard-code user identities into the PAM stack this way. So, is it possible to avoid hard-coding the id parameter to the pam_yubico.so module itself? If not, are there any other PAM modules that can leverage YubiKey authentication without hard-coding the stack?

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  • Best way to integrate StyleCop with TFS CI

    - by Slavo
    I've been doing research on how to enable source analysis for the project I'm working on and plan to use StyleCop. The setup I have is a TFS Server for source control, using TFS Continuous Integration. I want to enable source analysis for CI builds and daily builds run on the build machine, and not only for those run on developers' machines. Here's an article from the documentation of StyleCop that I read on the subject: http://blog.newagesolution.net/2008/07/how-to-use-stylecop-and-msbuild-and.html. It basically modifies the csproj file for the purpose. I've also read other opinions about how StyleCop should be integrated with build automation, which advise doing the same thing using build tasks: http://blog.newagesolution.net/2008/07/how-to-use-stylecop-and-msbuild-and.html http://freetodev.spaces.live.com/blog/cns!EC3C8F2028D842D5!400.entry. What are you opinions? Have you had similar projects and done something like this?

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  • Integrate StyleCop in NAnt buildscript

    - by stmax
    Is there a way to integrate StyleCop in a NAnt script such that the build fails if there are too many style violations? There doesn't seem to be a NAnt task for StyleCop, but we've found StyleCopCmd. However this only seems to generate an XML file as output that we'd have to parse. Is there some easier solution?

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  • How to integrate KVC in MVC?

    - by Paperflyer
    So I have an MVC-application in Cocoa. There are some custom views, a controller and a model. Of course, the views need to know some stuff, so they get their data from the controller. However, they do not use accessors in the controller, they use KVC with a keypath that calls right through to the model: // In view.m time = [timeSource valueForKeyPath:@"theModel.currentTime"]; // timeSource is a pseudo-delegate of the view that holds the controller This simplifies things a great deal and technically, the views still don't know the model in person (that is, in pointer). But of course, they access it directly. Is that a usual (or at least sensible) usage of KVC and MVC? Or how would you implement this kind of communication?

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  • Javascript file as an anonymous function

    - by Andrew Kou
    I have been reading a lot of Javascript lately and I have been noticing that the whole file is wrapped like the following in the .js files to be imported. (function() { ... code ... })() What is the reason for doing this rather than a simple set of constructor functions?

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  • Why use short-circuit code?

    - by Tim Lytle
    Related Questions: Benefits of using short-circuit evaluation, Why would a language NOT use Short-circuit evaluation?, Can someone explain this line of code please? (Logic & Assignment operators) There are questions about the benefits of a language using short-circuit code, but I'm wondering what are the benefits for a programmer? Is it just that it can make code a little more concise? Or are there performance reasons? I'm not asking about situations where two entities need to be evaluated anyway, for example: if($user->auth() AND $model->valid()){ $model->save(); } To me the reasoning there is clear - since both need to be true, you can skip the more costly model validation if the user can't save the data. This also has a (to me) obvious purpose: if(is_string($userid) AND strlen($userid) > 10){ //do something }; Because it wouldn't be wise to call strlen() with a non-string value. What I'm wondering about is the use of short-circuit code when it doesn't effect any other statements. For example, from the Zend Application default index page: defined('APPLICATION_PATH') || define('APPLICATION_PATH', realpath(dirname(__FILE__) . '/../application')); This could have been: if(!defined('APPLICATION_PATH')){ define('APPLICATION_PATH', realpath(dirname(__FILE__) . '/../application')); } Or even as a single statement: if(!defined('APPLICATION_PATH')) define('APPLICATION_PATH', realpath(dirname(__FILE__) . '/../application')); So why use the short-circuit code? Just for the 'coolness' factor of using logic operators in place of control structures? To consolidate nested if statements? Because it's faster?

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  • Lisp Style question label local functions or not?

    - by Andrew Myers
    I was wondering if there is a standard practice regarding the use of labels in Lisp. I've been messing around with a Lisp implementation of the algorithm described in the first answer here http://stackoverflow.com/questions/352203/generating-permutations-lazily My current version uses labels to break out portions of functionality. (defun next-permutation (pmute) (declare (vector pmute)) (let ((len (length pmute))) (if (> len 2) (labels ((get-pivot () (do ((pivot (1- len) (1- pivot))) ((or (= pivot 0) (< (aref pmute (1- pivot)) (aref pmute pivot))) pivot))) (get-swap (pivot) (let ((swp (1- len))) (loop for i from (1- len) downto pivot do (if (or (and (> (aref pmute i) (aref pmute (1- pivot))) (< (aref pmute i) (aref pmute swp))) (< (aref pmute swp) (aref pmute (1- pivot)))) (setf swp i))) swp)) (next (swp pivot) (rotatef (aref pmute (1- pivot)) (aref pmute swp)) (reverse-vector pmute pivot (1- len)))) (let ((piv (get-pivot))) (if (> piv 0) (next (get-swap piv) piv) nil)))))) Since each label is only called once I was wondering if this is considered bad practice since the only reason to do it in this case is for aesthetic reasons. I would argue that the current version with labels is clearer but that may go against common wisdom that I'm not aware of, being new to Lisp.

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  • Are endless loops in bad form?

    - by rlbond
    So I have some C++ code for back-tracking nodes in a BFS algorithm. It looks a little like this: typedef std::map<int> MapType; bool IsValuePresent(const MapType& myMap, int beginVal, int searchVal) { int current_val = beginVal; while (true) { if (current_val == searchVal) return true; MapType::iterator it = myMap.find(current_val); assert(current_val != myMap.end()); if (current_val == it->second) // end of the line return false; current_val = it->second; } } However, the while (true) seems... suspicious to me. I know this code works, and logically I know it should work. However, I can't shake the feeling that there should be some condition in the while, but really the only possible one is to use a bool variable just to say if it's done. Should I stop worrying? Or is this really bad form. EDIT: Thanks to all for noticing that there is a way to get around this. However, I would still like to know if there are other valid cases.

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  • When should I use Perl's AUTOLOAD?

    - by Robert S. Barnes
    In "Perl Best Practices" the very first line in the section on AUTOLOAD is: Don't use AUTOLOAD However all the cases he describes are dealing with OO or Modules. I have a stand alone script in which some command line switches control which versions of particular functions get defined. Now I know I could just take the conditionals and the evals and stick them naked at the top of my file before everything else, but I find it convenient and cleaner to put them in AUTOLOAD at the end of the file. Is this bad practice / style? If you think so why, and is there a another way to do it? As per brian's request I'm basically using this to do conditional compilation based on command line switches. I don't mind some constructive criticism. sub AUTOLOAD { our $AUTOLOAD; (my $method = $AUTOLOAD) =~ s/.*:://s; # remove package name if ($method eq 'tcpdump' && $tcpdump) { eval q( sub tcpdump { my $msg = shift; warn gf_time()." Thread ".threads->tid().": $msg\n"; } ); } elsif ($method eq 'loginfo' && $debug) { eval q( sub loginfo { my $msg = shift; $msg =~ s/$CRLF/\n/g; print gf_time()." Thread ".threads->tid().": $msg\n"; } ); } elsif ($method eq 'build_get') { if ($pipelining) { eval q( sub build_get { my $url = shift; my $base = shift; $url = "http://".$url unless $url =~ /^http/; return "GET $url HTTP/1.1${CRLF}Host: $base$CRLF$CRLF"; } ); } else { eval q( sub build_get { my $url = shift; my $base = shift; $url = "http://".$url unless $url =~ /^http/; return "GET $url HTTP/1.1${CRLF}Host: $base${CRLF}Connection: close$CRLF$CRLF"; } ); } } elsif ($method eq 'grow') { eval q{ require Convert::Scalar qw(grow); }; if ($@) { eval q( sub grow {} ); } goto &$method; } else { eval "sub $method {}"; return; } die $@ if $@; goto &$method; }

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  • How to use Python list comprehension (or such) for retrieving rows when using MySQLdb?

    - by Erik Nygren
    Hey all, I use MySQLdb a lot when dealing with my webserver. I often find myself repeating the lines: row = cursor.fetchone() while row: do_processing(row) row = cursor.fetchone() Somehow this strikes me as somewhat un-pythonic. Is there a better, one-line way to accomplish the same thing, along the lines of inline assignment in C: while (row = do_fetch()) { do_processing(row); } I've tried figuring out the syntax using list comprehensions, but I can't seem to figure it out. Any recommendations? Thanks, Erik

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  • What is the C# static fields naming convention?

    - by Matt
    I have recently started using ReSharper which is a fantastic tool. Today I came across a naming rule for static fields, namely prefixing with an underscore ie. private static string _myString; Is this really the standard way to name static variables? If so is it just personal preference and style, or does it have some sort of lower level impact? Eg Compilation JIT etc? Where does this style originate from? I have always associated it with C++, is that correct?

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  • indentation preference and personality

    - by dreftymac
    This question is similar in spirit to : http://stackoverflow.com/questions/492178/links-between-personality-types-and-language-technology-preferences But it is based specifically on indentation (spaces vs tabs and the number of spaces). The reason I am asking here instead of searching is because I remember seeing a specific document writing about this. If I remember correctly, it also talked about why Linus prefers eight spaces.

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  • Is this good C# style?

    - by burnt1ce
    Consider the following method signature: public static bool TryGetPolls(out List<Poll> polls, out string errorMessage) This method performs the following: accesses the database to generate a list of Poll objects. returns true if it was success and errorMessage will be an empty string returns false if it was not successful and errorMessage will contain an exception message. Is this good style? Update: Lets say i do use the following method signature: public static List<Poll> GetPolls() and in that method, it doesn't catch any exceptions (so i depend the caller to catch exceptions). How do i dispose and close all the objects that is in the scope of that method? As soon as an exception is thrown, the code that closes and disposes objects in the method is no longer reachable.

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  • Style: Dot notation vs. message notation in Objective-C 2.0

    - by groundhog
    In Objective-C 2.0 we got the "dot" notation for properties. I've seen various back and forths about the merits of dot notation vs. message notation. To keep the responses untainted I'm not going to respond either way in the question. What is your thought about dot notation vs. message notation for property accessing? Please try to keep it focused on Objective-C - my one bias I'll put forth is that Objective-C is Objective-C, so your preference that it be like Java or JavaScript aren't valid. Valid commentary is to do with technical issues (operation ordering, cast precedence, performance, etc), clarity (structure vs. object nature, both pro and con!), succinctness, etc. Note, I'm of the school of rigorous quality and readability in code having worked on huge projects where code convention and quality is paramount (the write once read a thousand times paradigm).

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