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• Best practice with respect to NPE and multiple expressions on single line

  - by JRL

  I'm wondering if it is an accepted practice or not to avoid multiple calls on the same line with respect to possible NPEs, and if so in what circumstances. For example: getThis().doThat(); vs Object o = getThis(); o.doThat(); The latter is more verbose, but if there is an NPE, you immediately know what is null. However, it also requires creating a name for the variable and more import statements. So my questions around this are: Is this problem something worth designing around? Is it better to go for the first or second possibility? Is the creation of a variable name something that would have an effect performance-wise? Is there a proposal to change the exception message to be able to determine what object is null in future versions of Java ?

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• When to alter a function vs when to just write a new one...?

  - by Andrew Heath

  /is n00b Through the gift of knowledge and expertise encoded here, I am doing my best to avoid n00b mistakes as I learn the basics of programming. I use functions when I (think I) can in PHP, and keep them somewhat sorted in different includes. The n00b problem I'm running into now is situations where perhaps 4/5th of an existing function is relevant to a new need. Maybe there are a slightly different set of inputs, or an additional calculation or two in the series, or output needs a different format/structure... but the core of the function is still applicable. Is there a good rule of thumb regarding when one should bolt-on crap to an original function and when one should (literally) copy & paste most of it into a new function and tweak to fit the situation? On the one hand I feel bad duping code, on the other I feel bad cluttering up an existing function with stuff not always needed...

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• Is it valid for Hibernate list() to return duplicates?

  - by skaffman

  Is anyone aware of the validity of Hibernate's Criteria.list() and Query.list() methods returning multiple occurrences of the same entity? Occasionally I find when using the Criteria API, that changing the default fetch strategy in my class mapping definition (from "select" to "join") can sometimes affect how many references to the same entity can appear in the resulting output of list(), and I'm unsure whether to treat this as a bug or not. The javadoc does not define it, it simply says "The list of matched query results." (thanks guys). If this is expected and normal behaviour, then I can de-dup the list myself, that's not a problem, but if it's a bug, then I would prefer to avoid it, rather than de-dup the results and try to ignore it. Anyone got any experience of this?

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• TFS 2008 warning when trying to add set-up project

  - by pm_2

  I have a similar problem to that mentioned here. However, mine is in TFS 2008. I get the following warning when trying to add a set-up project to an existing solution (either just create the set-up project or “add to source control”). The project that you are attempting to add to source control may cause other source control users to have difficulty opening this solution or getting newer versions of it. To avoid this problem, add the project from a location below the binding root of the other source controlled projects in the solution Continue / Cancel As with the question above, I think my folder structure is at fault. However, the current folder structure is as follows: Solution Main Project My guess is that, for some reason it’s trying to add the set-up project directly into the solution folder. So, is there a way to validate where it’s trying to add this without selecting “Continue” above? Alternatively, is there a way to force the set-up project to create in its own folder?

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• How to make g++ search for header files in a specific directory?

  - by Bane

  I have a project that is subdivided into a few directories with code in them. I'd like to to have g++ search for header files in the project's root directory, so I can avoid different include paths for same header files across multiple source files. Mainly, the root/ directory has sub-directories A/, B/ and C/, all of which have .hpp and .cpp files inside. If some source file in A wanted to include file.hpp, which was in B, it would have to do it like this: #include "../B/file.hpp". Same for another source file that was in C. But, if A itself had sub-directories with files that needed file.hpp, then, it would be inconsistent and would cause errors if I decided to move files (because the include path would be "../../B/file.hpp"). Also, this would need to work from other projects as well, which reside outside of root/. I already know that there is an option to manually copy all my header files into a default-search directory, but I'd like to do this the way I described.

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• usedefaultcredentials in order to call DirectoryEntry

  - by Copeleto

  Hi, I am working in a Login page and teh logic is like - try { DirectoryEntry LDAPLogin = new DirectoryEntry(ConfigurationSettings.AppSettings ["LDAPPath"].ToString(), Usuario, Txt_Contrasenia.Text.ToString()); if (LDAPLogin.NativeGuid != LDAPLogin.Name) ValidarGrupo(); } catch (Exception exc) { Label_Info.Text = "Sus credenciales no son validas: " + Usuario.ToString() + " " + exc.Message; } If the user enters the rights credentials I call a method ValidarGrupo that implements a lookup in the AD for a group of the user I woould like to replace the username and password with UseDefaultCredentials in order to avoid that the user has to enter the username and password and the Login pages use the credentials of the user that is login on the machine.

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• Integrating 3rd-party forum software to member-based website

  - by john

  When using some existing forum software in a larger web-site, how easy is it to: 1)Make your site's login functionality log the user into the forum 2)Make your site's registration functionality create forum login data I suppose in a way it might be easier to ONLY use the forum's database for maintaining users, but that means trusting it with sensitive data. I'm planning an integration between an existing bespoke desktop app and a new bespoke web-site which should include forums. I don't know which forums will be used but I know the new web functionality won't be PHP-based. I figure that's not a big deal but I'm wondering if forums typically allow configuration of where they look for login data, to avoid duplicating this data into my DB and the forum DB.

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• Can jQuery animate() behave differently for specific elements within my selection?

  - by Sune Rasmussen

  I have a selection of elements in a jQuery object. I want to animate their font sizes, but as I have both the headlines and various paragraphs in the selection, they should be animated slightly differently, as the headlines should end up with a larger font size than the paragraphs. I already have this information stored in the jQuery data cache. I can do that. But, not unless I use several calls to the animate function, one for each specific, slightly different animation, perhaps using event triggering or setTimeout() calls. Of course I want to avoid this, as it's damn ugly and an odd way around. Much prettier if it could be done internally, within the animation ... Any help would be much appreciated.

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• Is the UIDatePicker really the best iPhone UI mechanism for selecting dates?

  - by BeachRunnerJoe

  Hello! I'm diving into iPhone/iPad development and I'm trying to find an elegant mechanism for allowing the user to select dates. It seems to me that a calendar control would be the best way to go, but I don't see one in anywhere in the SDK. All all I see is this overblown, the-price-is-right-looking DatePicker control. Is this the only control that comes with UIKit for allowing the user to select dates? What about the calendar that the Notes app uses? Also, I should note I'm really trying to avoid using 3rd party code frameworks that have little or no documentation, because I'm new to all this and sufficient documentation is a must at this point. Thanks so much in advance for all your wisdom!

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• How to break a series of git commits into patches for submission to another project

  - by krosenvold

  So I've been bashing away at my favorite open source project for quite some time, and It's time for submitting issues with patches back. I have to regroup my commits more or less fully, and hopefully extract some pieces of code that can function as distinct patches to avoid code bombing. Currently I usually do something like this: rebase/squash everything to one commit since the old ones often don't make sense as patches undo that commit start adding stuff that I think fits to one commit, using add/add -i commit stash the rest test that commit re-apply the stash and start from 3 until all is accounted for It works, but is there a better way ?

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• Drupal: installing it in a subfolder...

  - by Patrick

  hi, this is a question about drupal installation on server. I usually upload my drupal into a subfolder "drupal" and I ask my customers to check the website in such subfolders until when it is ready. Then I asl to change the default folder in Apache to the "drupal" one. Sometimes my customer cannot change Apache configuration, so I was wondering if I can use a php script to forward users from root folder to the drupal one, or I should move the website to the root folder (which I would prefer to avoid, because is time consuming). thanks

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• Quick Question: How can I make sure the current directory is not changed because of OpenFileDialog?

  - by pecker

  say my application is installed in C:\programfiles\xyz\ I've some setting & other data files (*.dat files) in this directory too. My application uses OpenFileDialog to open an image. Problem is that when ever user browses to some directory (say MyPictures) for an image. The current working directory of the application becomes that directory (MyPictures in this case). After user inputs the image. I do some processing over it and save some values to imagedata.dat which will be located in the path where original application is installed.(C:\programfiles\xyz here ) In my code I'm just using FileStream("imagedata.dat",...,...) without any path prefix before the filename. Problem here is that application is crashing because it is searching for imagedata.dat in 'MyPictures\imagedata.dat'. How can I avoid this?

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• problem with pagestate when two links in aspx page

  - by TT.LTT

  I have two links in my aspx page. one link "A" when i click it ...it is downloading some document when i click it other link "B" when I click it ....it redirects me to some other page. Both links triggers function from code behind. Both links works fine when i first come onto page but when i click A it shows me message to download it "open" "save" "cancel" problem is when i click cancel I remain on the same page but now no links work neither link A nor link B. I guess there is some problem with the state my page is in . How i can avoid this? Code so far: <asp:Linkbutton ID="linkbutton1" runat="server" Text="A" onClick="Codebehindmethod" /> <asp:Linkbutton ID="linkbutto2" runat="server" Text="B" onClick="Codebehindmethod1" >

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• Using read() directly into a C++ std:vector

  - by Joe

  I'm wrapping up user space linux socket functionality in some C++ for an embedded system (yes, this is probably reinventing the wheel again). I want to offer a read and write implementation using a vector. Doing the write is pretty easy, I can just pass &myvec[0] and avoid unnecessary copying. I'd like to do the same and read directly into a vector, rather than reading into a char buffer then copying all that into a newly created vector. Now, I know how much data I want to read, and I can allocate appropriately (vec.reserve). I can also read into &myvec[0], though this is probably a VERY BAD IDEA. Obviously doing this doesn't allow myvec.size to return anything sensible. Is there any way of doing this that 1) Doesn't completely feel yucky from a safety/C++ perspective and 2) Doesn't involve two copies of the data block - once from kernel to user space and once from a C char * style buffer into a C++ vector. Any thoughts collective?

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• Inline javascript performance.

  - by Geromey

  I know it is better coding practice to avoid inline javascript like: <img id="the_image" onclick="do_this(true);return false;"/> I am thinking about switching this kind of stuff for bound jquery click events like: $("#the_image").bind("click",function(){ do_this(true); return false; }); Will I lose any performance if I bind a ton of click events? I am not worried about the time it takes to initially bind the events, but the response times between clicking and it happening. I bet if there is a difference, it is negligible, but I will have a ton of functions bound. I'm wondering if browsers treat the onclick attribute the same way as a bound event. Thanks

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• How to remove duplicate line in a file

  - by Abs

  Hi I'm using the below method to write to a file from the Jtextarea and I call this method every 30 second within a Timer but instead to add only new line in file it rewrite the entire lines contained in Jtextarea so then I have duplicate lines. I want to avoid this and update the file just with new lines. Could you help me please. public void loger() { FileWriter writer = null; try { writer = new FileWriter("MBM_Log_"+date()+".txt" , true); textArea.write(writer); } catch (IOException exception) { System.err.println("log error"); exception.printStackTrace(); } finally { if (writer != null) { try { writer.close(); } catch (IOException exception) { System.err.println("Error closing writer"); exception.printStackTrace(); } } } }

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• SQL 2005 w/ C# optimal "Paging"

  - by David Murdoch

  When creating a record "grid" with custom paging what is the best/optimal way to query the total number of records as well as the records start-end using C#? SQL to return paged record set: SELECT Some, Columns, Here FROM ( SELECT ROW_NUMBER() OVER (ORDER BY Column ASC) AS RowId, * FROM Records WHERE (...) ) AS tbl WHERE ((RowId > @Offset) AND (RowId <= (@Offset + @PageSize)) ) SQL to count total number of records: SELECT COUNT(*) FROM Records WHERE (...) Right now, I make two trips to the server: one for getting the records, and the other for counting the total number of records. What is/are the best way(s) to combine these queries to avoid multiple DB trips?

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• What are Android different screens dimensions in dp for different screens (e.g. xlarge = 960dp x 720dp)?

  - by Zizo

  in this link: Range of screens supported, Android team mentioned that: As you design your UI for different screen sizes, you'll discover that each design requires a minimum amount of space. So, each generalized screen size above has an associated minimum resolution that's defined by the system. These minimum sizes are in "dp" units—the same units you should use when defining your layouts—which allows the system to avoid worrying about changes in screen density. xlarge screens are at least 960dp x 720dp large screens are at least 640dp x 480dp normal screens are at least 470dp x 320dp small screens are at least 426dp x 320dp So, If I want to support all Android screens, can I create images, for full screen view, in those dimensions and that will be sufficient condition to support all available screens? or they are just the minimum sizes, and I need other dimensions? If other dimensions are needed, Please list them as in the list above. Thanks in Advance.

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• Matching of tuples

  - by Jack

  From what I understood I can use pattern-matching in a match ... with expression with tuples of values, so something like match b with ("<", val) -> if v < val then true else false | ("<=", val) -> if v <= val then true else false should be correct but it gives me a syntax error as if the parenthesis couldn't be used: File "ocaml.ml", line 41, characters 14-17: Error: Syntax error: ')' expected File "ocaml.ml", line 41, characters 8-9: Error: This '(' might be unmatched referring on first match clause.. Apart from that, can I avoid matching strings and applying comparisons using a sort of eval of the string? Or using directly the comparison operator as the first element of the tuple?

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• "Cleanly" Deploying an ASP.NET Application with LINQ to SQL Server

  - by Bob Kaufman

  In my development environment, my SQL Server is PHILIP\SQLEXPRESS. In testing, it's ANNIE, and the live environment will have a third name yet to be determined. I would have assumed that updating the following statement in web.config would have been enough: <add name="MyConnectionString"providerName="System.Data.SqlClient" connectionString="Data Source=PHILIP\SQLEXPRESS;Initial Catalog=MyDtabase;Integrated Security=True" /> When using SqlConnection, SqlCommand, SqlDataReader and friends, that's all it took. Using LINQ, it doesn't seem to work that nicely. I see the servername repeated in my .dbml file as well as in Settings.settings. After changing it in all of those places, I get it to work. However if I'm doing a few deployments per day during testing, I want to avoid this regimen. My question is: is there a programmatic solution for LINQ to SQL that will allow me to specify the connection string once, preferably in web.config, and get everybody else to refer to it?

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• Custom app.config section with a simple list of "add" elements

  - by Joe

  How do I create a custom app.config section that is just a simple list of add elements? I have found a few examples (e.g. http://stackoverflow.com/questions/1316058) for custom sections that look like this: <RegisterCompanies> <Companies> <Company name="Tata Motors" code="Tata"/> <Company name="Honda Motors" code="Honda"/> </Companies> </RegisterCompanies> But how do I avoid the extra collection element ("Companies") so that it looks the same as the appSettings and connectionStrings sections? In other words, I'd like: <registerCompanies> <add name="Tata Motors" code="Tata"/> <add name="Honda Motors" code="Honda"/> </registerCompanies>

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• Should I use custom exceptions to control the flow of application?

  - by bonefisher

  Is it a good practise to use custom business exceptions (e.g. BusinessRuleViolationException) to control the flow of user-errors/user-incorrect-inputs??? The classic approach: I have a web service, where I have 2 methods, one is the 'checker' (UsernameAlreadyExists()) and the other one is 'creator' (CreateUsername())... So if I want to create a username, I have to do 2 roundtrips to webservice, 1.check, 2.if check is OK, create. What about using UsernameAlreadyExistsException? So I call only the 2. web service method (CrateUsername()), which contains the check and if not successfull, it throws the UsernameAlreadyExistsException. So the end goal is to have only one round trip to web service and the checking can be contained also in other web service methods (so I avoid calling the UsernameAlreadyExists() all the times..). Furthermore I can use this kind of business error handling with other web service calls completely avoiding the checking prior the call.

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• overwrite a file which is already used by another process

  - by Ahmy

  I have a web site and i am showing videos to visitors, at the admin side i am filling the form of video and upload video file and sometimes i need to change(update) the video so i update the video by uploading another one, when i create the video in the first time i concatenate a datetime variable with the video name to avoid repeatition(file already exist) and when updatting the video the problem appears.... as if i upload the new video with the previous name so it will replace the previous one and in this case if the video is used by another process it will fail and the second option(which i am already using) is to upload a new video and concatenating new datetime variable with video title, so the previous and the new video will exist in the same directory and in this case i will lose too much space in my server directory as i have unused videos which takes space which in future will cause problem to me in the disk space so how can i solve this problem ? Hope that my question is clear....thanks in advance for any try

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• Symfony 1.4: Is it possible to prevent escaping of a redirect URL?

  - by Tom

  Hi, If I do a redirect in action as normal: $this->redirect('@mypage?apple=1&banana=2&orange=3'); ... Symfony produces the correct URL: /something/something?apple=1&banana=2&orange=3 However, the following gets escaped for some bizarre reason: $string = 'apple=1&banana=2&orange=3'; $this->redirect('@mypage?'.$string); ... and the following URL is produced: /something/something?apple=1&amp;banana=2&amp;orange=3 Is there a way to avoid this escaping and have the ampersands appear correctly in the URL? I've tried everything I can think of and it's driving me mad. I need this for a situation where I'm pulling a saved query as a string from the database and would just like to latch it onto the URL. I'm aware that I could generate an array from the string and then generate a brand new URL from the array, but it just seems like a lot of overhead because of this silly escaping. Thanks.

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• Strict pointer aliasing: any solution for a specific problem?

  - by doublep

  I have a problem caused by breaking strict pointer aliasing rule. I have a type T that comes from a template and some integral type Int of the same size (as with sizeof). My code essentially does the following: T x = some_other_t; if (*reinterpret_cast <Int*> (&x) == 0) ... Because T is some arbitary (other than the size restriction) type that could have a constructor, I cannot make a union of T and Int. (This is allowed only in C++0x only and isn't even supported by GCC yet). Is there any way I could rewrite the above pseudocode to preserve functionality and avoid breaking strict aliasing rule? Note that this is a template, I cannot control T or value of some_other_t; the assignment and subsequent comparison do happen inside the templated code. (For the record, the above code started breaking on GCC 4.5 if T contains any bit fields.)

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