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• Avoiding accidentally catching KeyboardInterrupt and SystemExit in Python 2.4

  - by jrdioko

  In Python scripts, there are many cases where a keyboard interrupt (Ctrl-C) fails to kill the process because of a bare except clause somewhere in the code: try: foo() except: bar() The standard solution in Python 2.5 or higher is to catch Exception rather than using bare except clauses: try: foo() except Exception: bar() This works because, as of Python 2.5, KeyboardInterrupt and SystemExit inherit from BaseException, not Exception. However, some installations are still running Python 2.4. How can this problem be handled in versions prior to Python 2.5? (I'm going to answer this question myself, but putting it here so people searching for it can find a solution.)

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• Antlr Lexer Quoted String Predicate

  - by Loki

  I'm trying to build a lexer to tokenize lone words and quoted strings. I got the following: STRING: QUOTE (options {greedy=false;} : . )* QUOTE ; WS : SPACE+ { $channel = HIDDEN; } ; WORD : ~(QUOTE|SPACE)+ ; For the corner cases, it needs to parse: "string" word1" word2 As three tokens: "string" as STRING and word1" and word2 as WORD. Basically, if there is a last quote, it needs to be part of the WORD were it is. If the quote is surrounded by white spaces, it should be a WORD. I tried this rule for WORD, without success: WORD: ~(QUOTE|SPACE)+ | (~(QUOTE|SPACE)* QUOTE ~QUOTE*)=> ~(QUOTE|SPACE)* QUOTE ~(QUOTE|SPACE)* ;

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• Visual Studio - "attach to particular instance of the process" macro

  - by Steve

  I guess prety much everyone who does a lot of debugging have a handy macro in Visual Studio (with shortcut to it on a toolbar) which when called automatically attaches to a particular process (identified by name). it saves a lot of time rather than clicking "Debug" - "Attach to the process ...", but it only works if one is running a single instance of the process one wants to attach to. If theres is more than one instance of particular process in memory - the first one (with a smaller PID?) is being choose by debugger. Does anyone have a macro which shows a dialog (if more that 1 process with a specified name running) and lets developer to select to one he/she really wants to attach to. I guess the selection could be made based on a windwow caption text (which would be suffice in most of cases) and when the particular instance is selected macro passes the PID of the process to the Debugger object? If someone has that macro or knows how to write it - please share. Thanks.

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• C++, throw exception from initializer list

  - by aaa

  hello. what is the best way to throw exception from initializer list? for example: class C { T0 t0; // can be either valid or invalid, but does not throw directly T1 t1; // heavy object, do not construct if t0 is invalid, by throwing before C(int n) : t0(n), // throw exception if t0(n) is not valid t1() {} }; I thought maybe making wrapper, e.g. t0(throw_if_invalid(n)). What is the practice to handle such cases? Thanks

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• PDO and SQL IN statements

  - by Sai

  Im using a sequel for search like this using PDOs $states = "'SC','SD'"; $sql = "select * from mytable where states in (:states)"; $params = array(':states'=>$states); and I use my function $result = $this->selectArrayAssoc($sql, $params); where my selectArrayAssoc function as following public function selectArrayAssoc($sql, $params = array()){ try{ $sth = $this->db->prepare($sql); $sth->execute($params); $result = $sth->setFetchMode(PDO::FETCH_ASSOC); return $sth->fetchAll(); }catch(PDOException $e){ print $e->getMessage(); //Log this to a file later when in production exit; } } it does not take the quoted variables, I think it is suppressing, in such cases how to deal with this.

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• FileWatcher fires change event after file deletion

  - by florin

  Hi all, I'm using a FileWatcher to trigger processing of files as soon as they are added to a folder. After the file it is processed it is deleted. My problem is that after the file is deleted I get another file change event which is so close to the deletion than in some cases checking for File.Exists it tells that the file still exists. But of course some milliseconds later when looking to process the file it does not really exists. The FileWatcher is set to notify on NotifyFilters.FileName | NotifyFilters.LastAccess | NotifyFilters.LastWrite | NotifyFilters.Size | NotifyFilters.Attributes Thanks, florin

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• Parameters with default value not in PsBoundParameters?

  - by stej

  General code Consider this code: PS> function Test { param($p='default value') $PsBoundParameters } PS> Test 'some value' Key Value --- ----- p some value PS> Test # nothing I would expect that $PsBoundParameters would contain record for $p variable on both cases. Is that correct behaviour? Question I'd like to use splatting for a lot of functions that would work like this: function SomeFuncWithManyRequiredParams { param( [Parameter(Mandatory=$true)][string]$p1, [Parameter(Mandatory=$true)][string]$p2, [Parameter(Mandatory=$true)][string]$p3, ...other parameters ) ... } function SimplifiedFuncWithDefaultValues { param( [Parameter(Mandatory=$false)][string]$p1='default for p1', [Parameter(Mandatory=$false)][string]$p2='default for p2', [Parameter(Mandatory=$false)][string]$p3='default for p3', ...other parameters ) SomeFuncWithManyRequiredParams @PsBoundParameters } I have more functions like this and I don't want to call SomeFuncWithManyRequiredParams with all the params enumerated: SomeFuncWithManyRequiredParams -p1 $p1 -p2 $p2 -p3 $p3 ... Is it possible?

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• Python lazy property decorator

  - by detly

  Recently I've gone through an existing code base and refactored a lot of instance attributes to be lazy, ie. not be initialised in the constructor but only upon first read. These attributes do not change over the lifetime of the instance, but they're a real bottleneck to calculate that first time and only really accessed for special cases. I find myself typing the following snippet of code over and over again for various attributes across various classes: class testA(object): def __init__(self): self._a = None self._b = None @property def a(self): if self._a is None: # Calculate the attribute now self._a = 7 return self._a @property def b(self): #etc Is there an existing decorator to do this already in Python that I'm simply unaware of? Or, is there a reasonably simple way to define a decorator that does this? I'm working under Python 2.5, but 2.6 answers might still be interesting if they are significantly different.

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• Is FastCGI still a right answer?

  - by Ted Henry

  FastCGI is old but it still seems like it must be the right answer in some cases. It seems like the preferred deployment of Perl/Catalyst web applications is with FastCGI. FastCGI was popular with Rails but seems to no longer be. (Why?) The Java world doesn't seem to have anything to do with FastCGI. Is something like Tomcat way better than Apache+FastCGI? Is choosing FastCGI still a good idea or just a lingering technology? Ted

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• Limitations in running Ruby/Rails on windows

  - by johnc

  In the installation documentation to RoR it mentions that there are many limitations to running Ruby on Rails on Windows, and in some cases, whole libraries do not work. How bad are these limitations, should I always default to Linux to code / run RoR, and is Iron Ruby expected to fix these limitations or are they core to the OS itself? EDIT Thanks for the answer around installation and running on Linux, but I am really trying to understand the limitations in functionality as referenced in the installation documentation, and non-working libraries - I am trying to find a link to the comment, but it was referenced in an installation read me when I installed the msi package I think

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• Can I use ruby rest-client to POST a binary file to an http API?

  - by Angela

  I have been using rest-client in ruby in post XML to a third-party API. I need to be able to include a binary image that's uploaded. How do I do that? Uploading Attachments Both letters and postcards will, in most cases, require the attachment of documents. Those attachments might be PDFs in the case of letters or images in the case of postcards. To uploading an attachment, submit a POST to: http://www.postful.com/service/upload Be sure to include the Content-Type and Content-Length headers and the attachment itself as the body of the request. POST /upload HTTP/1.0 Content-Type: application/octet-stream Content-Length: 301456 ... file content here ... If the upload is successful, you will receive a response like the following: 290797321.waltershandy.2

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• Image 8-connectivity without excessive branching?

  - by shoosh

  I'm writing a low level image processing algorithm which needs to do alot of 8-connectivity checks for pixels. For every pixel I often need to check the pixels above it, below it and on its sides and diagonals. On the edges of the image there are special cases where there are only 5 or 3 neighbors instead of 8 neighbors for a pixels. The naive way to do it is for every access to check if the coordinates are in the right range and if not, return some default value. I'm looking for a way to avoid all these checks since they introduce a large overhead to the algorithm. Are there any tricks to avoid it altogether?

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• What is needed to get Delphi back on top?

  - by Jim McKeeth

  Delphi 2009 is due in the next couple months, which is its 12th release since Turbo Pascal became Delphi in 1995. Despite continued innovation it has not returned to its level of popularity before the Inprise fiasco. Many developers with Delphi backgrounds are moving to C# and many Delphi legacy applications are being rewritten in C#, despite the fact Delphi supports .NET and in many cases the existing application could be ported without rewriting. Is it just a losing battle to compete against Microsoft's tools on their platform? Is there something Code Gear / Delphi can do now that they are under new management to regain market share? What can enthusiasts do to help? Why do you do Delphi programming? or Why are you not doing Delphi programming?

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• OpenGL - drawing 2D polygons shapes with texture

  - by plonkplonk

  I am trying to make a few effects in a C+GL game. So far I draw all my sprites as a quad, and it works. However, I am trying to make a large ring appear at times, with a texture following that ring, as it takes less memory than a quad with the ring texture inside. The type of ring I want to make is not a round-shaped GL mesh ring (the "tube" type) but a "paper" 2D ring. That way I can modify the "width" of the ring, getting more of the effect than a simple quad+ring texture. So far all my attempts have been...kind of ridiculous, as I don't understand GL's coordinates too well (and I can't really understand the available documentation...I am just a designer with no coder help or background. A n00b, basically). glBegin(GL_POLYGON); for(i = 0;i < 360; i += 10){ glTexCoord2f(0, 0); glVertex2f(Cos(i)*(H-10),Sin(i)H); glTexCoord2f(0, HP); glVertex2f(Sin(i)(H-10),Cos(i)*(H-10)); glTexCoord2f(WP, HP); glVertex2f(Cos(i)H,Sin(i)(H-10)); glTexCoord2f(WP, 0); glVertex2f(Sin(i)*H,Cos(i)*H); } glEnd(); This is my last attempt, and it seems to generate a "sunburst" from the right edge of the circle instead of a ring. It's an amusing effect but definitely not what I want. Other results included the circle looking exactly the same as the quad textured (aka drawing a sprite literally) or something that looked like a pop-art filter, by working on this train of thought. Seems like my logic here is entirely flawed, so, what would be the easiest way to obtain such a ring? No need to reply in code, just some guidance for a non-math-skilled user...

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• java for loop pre-increment vs post-increment

  - by rails_guy

  for (int i = 0; i < 3; ++i) System.out.print(i + ".."); //prints 0..1..2 for (int i = 0; i < 3; i++) System.out.print(i + ".."); //prints 0..1..2 So what is the difference? in what cases can the pre-increment be used wrongly or by mistake which causes a bug...

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• selenium RC doesnt run the whole test suite

  - by logiclife

  I'm trying to run an html testSuite with Selenium RC. The browser starts, the first test runs, and it stops. It doesnt continue to the second test case. I named both the test cases with .html extension. IAm using Firefox. If i run them manually , individually from the selenium RC test runner window they run ok. what am i missing, this seems pretty simple but yet iam not able to get this working. Iam using selenium RC 1.0.3 command here java -jar selenium-server.jar -firefoxProfileTemplate"C:\Users\sicky\AppData\Roaming\Mozilla\Firefox\Profiles\zvt0jj7c.default" -htmlsuite "*firefox" "https://4.17.8.9/" "C:\Users\sicky\Documents\selenium scripts\suite.html" "C:\Users\sicky\Documents\selenium scripts\results.html" What am i missing? Pls let me know

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• Programmatically Centering UIViews

  - by David Foster

  I've seen a bunch of similar questions to this, but nothing seems to be completely what I'm looking for. Do forgive me if I have missed the solution answered in another question, though! Right. I have a view. 160 pixels both tall and wide. I know that this view is going to be used as a subview, and I know that it always needs to be centered about both axis in whatever situation it's used. If defining the view programmatically, how can I be sure that it is always perfectly centered, horizontally and vertically, relative to its superview? So far, all I have is this simple code: - (void)loadView { self.view = [[UIView alloc] initWithFrame:CGRectMake(80, 150, 160, 160)]; self.view.backgroundColor = [UIColor greenColor]; self.view.autoresizingMask = (UIViewAutoresizingFlexibleLeftMargin | UIViewAutoresizingFlexibleRightMargin | UIViewAutoresizingFlexibleTopMargin | UIViewAutoresizingFlexibleBottomMargin); [self.view release]; } This does the centralization, but only in the simplest of cases. Any insight is greatly appreciated.

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• Flex: HTTP request error #2032

  - by alexey

  In Flex 3 application I use HTTPService class to make requests to the server: var http:HTTPService = new HTTPService(); http.method = 'POST'; http.url = hostUrl; http.resultFormat = 'e4x'; http.addEventListener(ResultEvent.RESULT, ...); http.addEventListener(FaultEvent.FAULT, ...); http.send(params); The application has Comet-architecture. So it makes long running requests. While waiting a response for this request, other requests can be made concurrently. The application works in most cases. But sometimes some clients get HTTP request error executing long running request: faultCode:Server.Error.Request faultString:'HTTP request error' faultDetail:'Error: [IOErrorEvent type="ioError" bubbles=false cancelable=false eventPhase=2 text="Error #2032"]. URL: 'http://example.com/ws' I think it depends on user's browser. Any ideas?

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• Mvc relative path using virtual directory..help!

  - by kevin

  When i drag and drop my image/script/css file into my view, relative path will automatically use to refer on the files. example: <link href="../../Content/style.css" rel="stylesheet" type="text/css" /> <script src="../../Scripts/jquery-min.js" type="text/javascript"></script> <img src="../../Images/logo.jpg" /> It is working fine when i host it on my root directory, but if i'm using virtual directory then only my css file able to refer correctly, the rest will return 404...as it will refer to http://{root}/Images/logo.jpg rather than http://{root}/{virtual directory}/Images/logo.jpg But why css file is working? and how to specify the relative path correctly for both root & virtual directory cases?

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• Delphi: Moving away from VSS

  - by Mohammed Nasman

  We are team of few Delphi developers who have been using VSS since years (I know it's a pity), but we don't use any of the advanced features of VCS, so it was working fine in many cases (but some times it was driving me crazy :( ). The good thing that we have with VSS that we use third-party plug-ings to integrate VSS with Delphi, which is working great, but now when our projects becomes larger, and we would like to move a way from VSS. I have looked at few other VCS (free and commercial) and found most of them seems be made for Linux guys, and you have to use command line for many admin work(I know I'm windows guy :P). What I'm looking for the new Version control that it should be easy to use and to maintain and Integrated nicely with Delphi IDE (D2007), or at least have a good UI for the Admins an developers.

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• maximum execution time for javascript

  - by Andrew Chang

  I know both ie and firefox have limits for javascript execution here: hxxp://support.microsoft.com/?kbid=175500 Based on number of statements executed, I heard it was 5 million somewhere in ie hxxp://webcache.googleusercontent.com/search?q=cache:_iKHhdfpN-MJ:kb.mozillazine.org/Dom.max_script_run_time+dom.max_script_run_time&hl=en&gl=ca&strip=1 (google cache since site takes forever to load for me) based on number of seconds in firefox, it's 10 seconds by default for my version The thing I don't get is what cases will go over these limits: I'm sure a giant loop will go over the limit for execution time But will an event hander go over the limit, if itself it's execution time is under the limit but if it occurs multiple times? Example: Lets say I have a timer on my page, that executes some javascript every 20 seconds. The execution time for the timer handler is 1 second. Does firefox and ie treat each call of the timer function seperatly, so it never goes over the limit, or is it that firefox/ie adds up the time of each call so after the handler finishes, so after 200 seconds on my site (with the timer called 10 times) an error occurs even though the timer handler itself is only 1 second long?

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• How to implement List, Set, and Map in null free design?

  - by Pyrolistical

  Its great when you can return a null/empty object in most cases to avoid nulls, but what about Collection like objects? In Java, Map returns null if key in get(key) is not found in the map. The best way I can think of to avoid nulls in this situation is to return an Entry<T> object, which is either the EmptyEntry<T>, or contains the value T. Sure we avoid the null, but now you can have a class cast exception if you don't check if its an EmptyEntry<T>. Is there a better way to avoid nulls in Map's get(K)? And for argument sake, let's say this language don't even have null, so don't say just use nulls.

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• What some good books on software testing/quality?

  - by mjh2007

  I'm looking for a good book on software quality. It would be helpful if the book covered: The software development process (requirements, design, coding, testing, maintenance) Testing roles (who performs each step in the process) Testing methods (white box and black box) Testing levels (unit testing, integration testing, etc) Testing process (Agile, waterfall, spiral) Testing tools (simulators, fixtures, and reporting software) Testing of embedded systems The goal here is to find an easy to read book that summarizes the best practices for ensuring software quality in an embedded system. It seems most texts cover the testing of application software where it is simpler to generate automated test cases or run a debugger. A book that provided solutions for improving quality in a system where the tests must be performed manually and therefore minimized would be ideal.

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• Web scraping with Python

  - by Jack

  I'm currently trying to scrape a website that has fairly poorly-formatted HTML (often missing closing tags, no use of classes or ids so it's incredibly difficult to go straight to the element you want, etc.). I've been using BeautifulSoup with some success so far but every once and a while (though quite rarely), I run into a page where BeautifulSoup creates the HTML tree a bit differently from (for example) Firefox or Webkit. While this is understandable as the formatting of the HTML leaves this ambiguous, if I were able to get the same parse tree as Firefox or Webkit produces I would be able to parse things much more easily. The problems are usually something like the site opens a <b> tag twice and when BeautifulSoup sees the second <b> tag, it immediately closes the first while Firefox and Webkit nest the <b> tags. Is there a web scraping library for Python (or even any other language (I'm getting desperate)) that can reproduce the parse tree generated by Firefox or WebKit (or at least get closer than BeautifulSoup in cases of ambiguity).

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• AStar in a specific case in C#

  - by KiTe

  Hello. To an intership, I have use the A* algorithm in the following case : the unit shape is a square of height and width of 1, we can travel from a zone represented by a rectangle from another, but we can't travel outside these predifined areas, we can go from a rectangle to another through a door, represented by a segment on corresponding square edge. Here are the 2 things I already did but which didn't satisfied my boss : 1 : I created the following classes : -a Door class which contains the location of the 2 separated squares and the door's orientation (top, left, bottom, right), -a Map class which contains a door list, a rectangle list representing the walkable areas and a 2D array representing the ground's squares (for additionnal infomations through an enumeration) - classes for the A* algorithm (node, AStar) 2 : -a MapCase class, which contains information about the case effect and doors through an enumeration (with [FLAGS] attribute set on, to be able to cummulate several information on each case) -a Map classes which only contains a 2D array of MapCase classes - the classes for the A* algorithm (still node an AStar). Since the 2 version is better than the first (less useless calculation, better map classes architecture), my boss is not still satisfied about my mapping classes architecture. The A* and node classes are good and easily mainainable, so I don't think I have to explain them deeper for now. So here is my asking : has somebody a good idea to implement the A* with the problem specification (rectangle walkable but with a square unit area, travelling through doors)? He said that a grid vision of the problem (so a 2D array) shouldn't be the correct way to solve the problem. I wish I've been clear while exposing my problem .. Thanks KiTe

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