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  • JavaScript try/catch: errors or exceptions?

    - by Josh
    OK. I may be splitting hairs here, but my code isn't consistent and I'd like to make it so. But before I do, I want to make sure I'm going the right way. In practice this doesn't matter, but this has been bothering me for a while so I figured I'd ask my peers... Every time I use a try... catch statement, in the catch block I always log a message to my internal console. However my log messages are not consistent. They either look like: catch(err) { DFTools.console.log("someMethod caught an error: ",err.message); ... or: catch(ex) { DFTools.console.log("someMethod caught an exception: ",ex.message); ... Obviously the code functions properly either way but it's starting to bother me that I sometimes refer to "errors" and sometimes to "exceptions". Like I said, maybe I'm splitting hairs but which is the proper terminology? "Exception", or "Error"?

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  • Performance of looping over an Unboxed array in Haskell

    - by Joey Adams
    First of all, it's great. However, I came across a situation where my benchmarks turned up weird results. I am new to Haskell, and this is first time I've gotten my hands dirty with mutable arrays and Monads. The code below is based on this example. I wrote a generic monadic for function that takes numbers and a step function rather than a range (like forM_ does). I compared using my generic for function (Loop A) against embedding an equivalent recursive function (Loop B). Having Loop A is noticeably faster than having Loop B. Weirder, having both Loop A and B together is faster than having Loop B by itself (but slightly slower than Loop A by itself). Some possible explanations I can think of for the discrepancies. Note that these are just guesses: Something I haven't learned yet about how Haskell extracts results from monadic functions. Loop B faults the array in a less cache efficient manner than Loop A. Why? I made a dumb mistake; Loop A and Loop B are actually different. Note that in all 3 cases of having either or both Loop A and Loop B, the program produces the same output. Here is the code. I tested it with ghc -O2 for.hs using GHC version 6.10.4 . import Control.Monad import Control.Monad.ST import Data.Array.IArray import Data.Array.MArray import Data.Array.ST import Data.Array.Unboxed for :: (Num a, Ord a, Monad m) => a -> a -> (a -> a) -> (a -> m b) -> m () for start end step f = loop start where loop i | i <= end = do f i loop (step i) | otherwise = return () primesToNA :: Int -> UArray Int Bool primesToNA n = runSTUArray $ do a <- newArray (2,n) True :: ST s (STUArray s Int Bool) let sr = floor . (sqrt::Double->Double) . fromIntegral $ n+1 -- Loop A for 4 n (+ 2) $ \j -> writeArray a j False -- Loop B let f i | i <= n = do writeArray a i False f (i+2) | otherwise = return () in f 4 forM_ [3,5..sr] $ \i -> do si <- readArray a i when si $ forM_ [i*i,i*i+i+i..n] $ \j -> writeArray a j False return a primesTo :: Int -> [Int] primesTo n = [i | (i,p) <- assocs . primesToNA $ n, p] main = print $ primesTo 30000000

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  • javascript open window references

    - by duckofrubber
    Hi, I'm having some issues understanding how to reference new browser windows after opening them. As an example, if I created 3 new windows from a main one (index.html): var one = window.open( 'one.html', 'one',"top=10,left=10,width=100,height=100,location=no,menubar=no,scrollbars=no,status=no,toolbar=no,resizable=no"); var two = window.open( 'two.html', 'two',"top=100,left=10,width=100,height=100,location=no,menubar=no,scrollbars=no,status=no,toolbar=no,resizable=no"); var three = window.open( 'three.html', 'three',"top=200,left=10,width=100,height=100,location=no,menubar=no,scrollbars=no,status=no,toolbar=no,resizable=no"); two.focus(); How could I programmatically focus on (or just refer to) browser "three" if browser "two" is currently in focus?

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  • Can a storyboard access the UserControl that it resides in?

    - by Jeremy
    I have a usercontrol, and I want a storyboard inside the user control to fade the user control out. Using Expression Blend, I can create the storyboard and cause it to fade the user control out, but when I run the silverlight application I get an error on FindControl stating that it can't find the control. I'm guessing the find control only searches the children of the parent, but does not look at the parent itself. Is there any way around this?

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  • How to keep an item selected? - ListView

    - by Dodi300
    Hello. I would like to keep an item selected, on a ListView, when the user clicks on a space which has no item. For example, the space below the items, but still on the ListView component. I've change the ListView property "HideSelection" to false, but that only works when the focus is changed to another component; not when the user clicks on the ListView itself. Thanks!

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  • Last node of the treeview selected node changed not working

    - by Domnic
    im using Treeview in my master page...and every node except last node get selected if i click on it and can be redirect to respond treenode page...but when i click last node of the treeview the selectednode changed event doesnt fired it just stop page load event itself(breakpoint)..... how can i solve this problem?

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  • Run function in infinite loop

    - by zac
    I am creating a background color animation with jQuery and the color animation plugin http://plugins.jquery.com/project/color How do I have a function stay in a loop repeating itself each time it has finished running? I tried this but it did not work : function colorLoop(){ $("#window") .animate({ backgroundColor: "orange" }, 11000) .animate({ backgroundColor: "violet" }, 1000) .animate({ backgroundColor: "red" }, 1000, colorLoop); };

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  • Testing file existence using NSURL

    - by Peter Hosey
    Snow Leopard introduced many new methods to use NSURL objects to refer to files, not pathnames or Core Services' FSRefs. However, there's one task I can't find a URL-based method for: Testing whether a file exists. I'm looking for a URL-based version of -[NSFileManager fileExistsAtPath:]. Like that method, it should return YES if the URL describes anything, whether it's a regular file, a directory, or anything else. I could attempt to look up various resource values, but none of them are explicitly guaranteed to not exist if the file doesn't, and some of them (e.g., NSURLEffectiveIconKey) could be costly if it does. I could just use NSFileManager's fileExistsAtPath:, but if there's a more modern method, I'd prefer to use that. Is there a simple method or function in Cocoa, CF, or Core Services that's guaranteed/documented to tell me whether a given file (or file-reference) URL refers to a file-system object that exists?

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  • Getting file updates in folders with no permission.

    - by Wesley
    I've been working on a program to monitor a network folder to find out which spreadsheets our company uses are the most popular. I'm using the FileSystemWatcher class in C# to do the monitoring. I've noticed I'm getting updates to files that are in folders that my user does not have permission to browse. I understand that my software is subscribing to a list of updates done by other system software and not actually browsing those files itself, but is this functionality intentional or is it a bug?

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  • A strategy to troubleshoot/ fix application crashes in Windows?

    - by Manav Sharma
    All, Over a period of time I have observed that fixing issues related to application crash is a discipline in itself. Some people have this nice way of attacking such problems. Ranging from Viewing the 'Event Viewer' to running Static/ Dynamic memory analysis tools to some of their 'personal favorites', these people have developed this art. Can we share articles/ links/ personal approaches that we use to understand/ troubleshoot/ fix such issues? Thanks

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  • How to set a reference from one object to another?

    - by Tzur Gazit
    Hi, Imagine the obvious model of employees and departments, where each employee must refer to a single department, and each department may have none to many employees. For Employee I have a pointer to Department, and I set its value to the address of the object of the relevant Department. When I try to save the Employee I get an error: 2010-04-07 10:05:22.491 CoreData2[1112:207] * Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '* -[NSCFDictionary setObject:forKey:]: attempt to insert nil value (key: Department)' I tried, just for testing, to make the reference from Employee to Department optional, but I get the same result. I'm having my first steps in CoreData so please be as clear and simple as you can. Thanks, Tzur.

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  • NSButton Aligned to the Right

    - by dave-gennel
    Hi, I want to have a check box, like the standard one (first the check box and on the right its title) but I want it to be aligned from the right. If I change the alignment to the right then only the text will move to the right but the button itself will still be at the left.. How would I achieve this without knowing the bounds of the NSButton? Thanks in advance.

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  • Marshaling and Unmarshaling of kml codes for Google Earth

    - by Kayson
    May i inquire more knowledge on marshaling and unmarshaling of kml codes? Regarding those used in Google earth. I need to do a project on flight airlines, linking them with an arc which is a polygon to connect placemarks with placemarks. I've tried to compile sample codes of HelloKML but still unable to marshal and produce the kml codes itself. Please someone explain marshaling and unmarshaling of codes and producing of kml codes. Thanks in advance.

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  • What is dot and hash symbols mean in JQuery

    - by kwokwai
    Hi all, I feel confused of the dot and hash symbols in the following example: <DIV ID="row"> <DIV ID="c1"> <Input type="radio" name="testing" id="testing" VALUE="1">testing1 </DIV> </DIV> Code 1: $('#row DIV').mouseover(function(){ $('#row DIV).addClass('testing'); }); Code 2 $('.row div').mouseover(function(){ $(this).addClass('testing'); });? Codes 1 and 2 look very similar, and so it makes me so confused that when I should use ".row div" to refer to a specific DIV instead of using "#row div" ?

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  • java dynamic memory allocation?

    - by JavaUser
    Hi, Why an object initialization using " new " keyword is called as dynamic memory allocation since compile time itself we know the memory needed for that object . Also please explain what happen when u do ClassA object = new ClassA(); in heap and stack . Thx

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  • How to inject local CSS and JavaScript from qrc:// into QWebView?

    - by speakman
    Trying to inject CSS and JS files reachable through Qt resources (qrc://) through JavaScript (using this technique) which itself is injected through a evalutateJavaScript() call fails fails miserably hitting this test in QNetworkAccessFileBackend. I can't figure how to make this work, really. I could subclass QNAFB but then I would need to subclass QNAM as well to make it instance my subclass instead of QNAFB?

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  • How do I gather TeamCity code coverage reports from multiple projects into one report?

    - by Loofer
    We use the build in coverage application in TeamCity 6 (about to upgrade to 7.1) If we wish to see the code coverage (or other metrics) of a particular build it is fine as we can navigate to that build, but it would be great if we could pluck out a few interesting metrics from all/some of the current projects/build configurations and display them all together. For convenience I would expect the new display to be accessible from within TeamCity itself, however if there are solutions that require a separate solution we could look at them. Thanks

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  • Enforce "spaces" or "tabs" only in python files ?

    - by edomaur
    In Python, is there a mean to enforce the use of spaces or tabs indentation with a per file basis ? Well, perhaps "enforce" is too strong, its more like "recommands". I keep getting files with mixed indentation and this is annoying... (to say the least) Python itself can tell when there is a problem, but I am searching something to do that at the editor level, like it exists for the charset.

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  • Refreshing Visual Studio's COM references tab

    - by r_honey
    I right-clicked on the bin folder of my web app to add a COM Reference. I did not find the desired Com reference in the list. I went back to the Command Line to register by desired Com dll using resvr32. However, the COM references tab does not shows it (looks like the information is cached somewhere). Even restarting VS did not help. Is their any easy way to refresh the COM references tab without rebooting the machine itself??

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  • htaccess/htpasswd in hierarchical folder structure

    - by chessweb
    I have a folder (folder_1) that is protected by htaccess/htpasswd files. Inside that folder is another folder (folder_2) that is protected by another couple of htaccess/htpasswd files. When a php-script in folder_1 or folder_2 is called, the user has to authenticate herself using the correct username and password as specified in the respective htaccess/htpasswd files. This works as intended. However, as soon as the php-script in folder_2 tries to refer to another script or a css-file that is located in folder_1, the user must enter username and password for folder_1 as well. Is there a way to avoid this that does not involve copying scripts and css-files from folder_1 to folder_2? Regards, Ralf

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  • handling Concurrency in SQL SERVER 2005

    - by sameer
    Hi, I have one question for you, if you can answer and refer resource it will be great help. I have a scenario where i need to create a appointment slot and a serial no for each slot memberwise. ex: Member Id |App Slot # 1|1 1|2 2|1 2|2 1|3 what im doing is take the Max slot number,increamenting it and insert it memberwise. but the problem is concurrent user can create a slot when i take the max slot after that if any other user insert the slot the value that im working with is no more valid, how to over come this problem Thanks & Regards, Sameer

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  • INSERT INTO ... SELECT FROM ... ON DUPLICATE KEY UPDATE

    - by dnagirl
    I'm doing an insert query where most of many columns would need to be updated to the new values if a unique key already existed. It goes something like this: INSERT INTO lee(exp_id, created_by, location, animal, starttime, endtime, entct, inact, inadur, inadist, smlct, smldur, smldist, larct, lardur, lardist, emptyct, emptydur) SELECT id, uid, t.location, t.animal, t.starttime, t.endtime, t.entct, t.inact, t.inadur, t.inadist, t.smlct, t.smldur, t.smldist, t.larct, t.lardur, t.lardist, t.emptyct, t.emptydur FROM tmp t WHERE uid=x ON DUPLICATE KEY UPDATE ...; //update all fields to values from SELECT, except for exp_id, created_by, location, animal, starttime, endtime I'm not sure what the syntax for the UPDATE clause should be. How do I refer to the current row from the SELECT clause?

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