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• Is it naughty to have a large utility file?

  - by banister

  In my C project I have quite a large utils.c file. It is really full of many utilities of different sorts. I feel a bit naughty just stuffing different miscellaneous functions in there. For example it has some utilities related to low level stuff such as a lowercase() function, and it also has some quite sophisticated utilities such as converting to/from different colour formats. My question is, is it very naughty to have such a large utils.c with many different types of utilities in it? Should I break it up into many different kinds of utility files? Such as graphics_utils.c and so on What do you think?

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• sem_open() error: "undefined reference to sem_open()" on linux (Ubuntu 10.10)

  - by Robin

  So I am getting the error: "undefined reference to sem_open()" even though I have include the semaphore.h header. The same thing is happening for all my pthread function calls (mutex, pthread_create, etc). Any thoughts? I am using the following command to compile: g++ '/home/robin/Desktop/main.cpp' -o '/home/robin/Desktop/main.out' #include <iostream> using namespace std; #include <pthread.h> #include <semaphore.h> #include <fcntl.h> const char *serverControl = "/serverControl"; sem_t* semID; int main ( int argc, char *argv[] ) { //create semaphore used to control servers semID = sem_open(serverControl,O_CREAT,O_RDWR,0); return 0; }

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• Wordpress Video Portal

  - by choise

  Hi out there, my challenge is to built a video portal, based on wordpress (blog already started). so in the backend there must be a option to add, tag, descripe videos and in frontend the videos must have a comment function, must be searchable and so on. wordpress gives already a large amout of functionallity and i want to use this, comments for example, but also categorisation and tagging. what is the best practise to built such a "plugin" ? where to start? what to use? custom tables and built everything by myself or can i use the blog functionallity to advantage? hopefully everything is clear, comment if not ;)

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• Join collection of objects into comma-separated string

  - by Helen Toomik

  In many places in our code we have collections of objects, from which we need to create a comma-separated list. The type of collection varies: it may be a DataTable from which we need a certain column, or a List<Customer>, etc. Now we loop through the collection and use string concatenation, for example: string text = ""; string separator = ""; foreach (DataRow row in table.Rows) { text += separator + row["title"]; separator = ", "; } Is there a better pattern for this? Ideally I would like an approach we could reuse by just sending in a function to get the right field/property/column from each object.

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• Jquery AJAX and figuring out how NOT to nest callbacks for multiple reloads.

  - by David H

  I have a site with a few containers that need to load content dynamically via AJAX. Most of the links inside of the containers actually load new data in that same container. I.E: $("#navmenu_item1").click(function() { $("#navmenu").load(blah); }); When I click on a link, lets say "logout," and the menu reloads with the updated login status, none of the links now work because I would need to add a new .click into the callback code. Now with repeated clicks and AJAX requests I am not sure how to move forward from here, as I am sure nested callbacks are not optimal. What would be the best way to do this? Do I include the .click event inside the actual AJAX file being pulled from the server, instead of within index.php? Or can I somehow reload the DOM? Thanks for the help!

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• Is there a code style enforcer?

  - by Petruza

  I'm working with websites written in PHP, along with many other programmers, and sometimes I have to deal with really awful code. Indentation totally messed up, curly braces in the wrong places, terrible whitespace use, it really hurts my eyes and actually makes my work harder and take longer. Is there a tool where you can specify your coding style and then it applies it to files? I'm sure there must be such functions in different IDEs, but I need an independent tool as I code with simple notepads like Notepad++ or the like. ( if it's such a function in Notepad++, I didn't see it )

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• jQuery: Checking for length of ul and removing an li element?

  - by Legend

  I am trying to remove the last <li> element from a <ul> element only if it exceeds a particular length. For this, I am doing something like this: var selector = "#ulelement" if($(selector).children().length > threshold) { $(selector + " >:last").remove(); } I don't like the fact that I have to use the selector twice. Is there a shorter way to do this? Something like a "remove-if-length-greater-than-threshold" idea. I was thinking that maybe there is a way to do this using the live() function but I have no idea how.

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• trigger jquery click

  - by dio

  Hello everyone, I use jquery to build treeview via ajax which has refreshed automatically every 5 second. And I want after building the tree, one of the branches to be selected automatically. But when I use $('#treeview li span.Running').click(); nothing happen. I catch the click event using $('#treeview li span').live('click',function(){ .... }); I try with jQuery instead of $ and it was unsuccessful. Thank you in advance. BR.

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• Is there a workaround to Safari's/Opera's bug that you can't tab through hyperlinks?

  - by scunliffe

  In IE, Firefox, Chrome and most Windows-based interfaces that I've used, the Tab key can be used to navigate from one form field or hyperlink to the next (e.g. "actionable" items) (note: I have not tested on other Operating Systems) However Safari and Opera skip all hyperlinks in a web page when tabbing. IMHO its a usability bug but I digress. Is there a workaround/hack to make Safari and/or Opera navigate through these links? I've noticed that Opera will accept the tabindex attribute if set e.g. tabindex="0" thus maintaining the links "index" within the flow of the DOM on the page... but Safari does not want to accept this. For those interested, this bit of jQuery will make all the hyperlinks clickable. //Make links 'tab-able' in Opera $(document).ready(function(){ if($.browser.opera){ $('a[href]').attr('tabindex', 0); } }); ...and although this seems to work for Opera... is there a better workaround?

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• struct method linking

  - by James

  I'm updating some old code that has several POD structs that were getting zero'd out by memset (don't blame me...I didn't write this part). Part of the update changed some of them to classes that use private internal pointers that are now getting wiped out by the memset. So I added a [non-virtual] reset() method to the various structs and refactored the code to call that instead. One particular struct developed an "undefined reference to `blah::reset()'" error. Changing it from a struct to a class fixed the error. Calling nm on the .o file h, the mangled function names for that method look the same (whether it's a class or a struct). I'm using g++ 4.4.1, on Ubuntu. I hate the thought that this might be a compiler/linker bug, but I'm not sure what else it could be. Am I missing some fundamental difference between structs and classes? I thought the only meaningful ones were the public/private defaults and the way everyone thinks about them.

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• Are there any syntax errors in the code snippet here?

  - by Mask

  typedef union YYSTYPE { int64_t iConst; // constant value float fConst; // constant value int iAttrLocator; // attribute locator (rowitem for int/float; offset+size for bits) int iFunc; // function id int iNode; // node index } YYSTYPE; It looks valid to me,but the cdt reports the following for the line int64_t iConst;: Multiple markers at this line: - syntax error before "int64_t" - no semicolon at the end of structure or union There are two files that defines int64_t,one is within the project itself(sphinxstd.h),the other is the MinGW/include/stdint.h,is it caused by this conflict?

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• iPhone: Having trouble figuring out how to scroll a UITableView with custom UITextField cells automa

  - by Gordon Fontenot

  Ok, I know this seems like a duplicate question, but don't think it is. I actually have this implemented already (thanks to this SO question), but it seems sluggish. I am willing to tweak it a bit, but I ran across a demo app by AboutObjects that seems to have exactly the right functionality with absolutely no code doing it. I have looked through their demo code dozens of times, and I can't figure out what they are doing that I am not. The code to look at is in their iPhone Development Tutorials section, and is called "Editable TableView" (2nd from the bottom). There are a couple of questions on the forums on that site asking how they got the functionality, but there is no answer (other than "It's a built in function"). Does anyone have any clue as to why their UITableView would implement the input scrolling by default (including being able to scroll the view manually when the keyboard pops up, which I cannot get to work)?

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• Multiple .obj Models in THREE.js and detecting clicked objects

  - by ZedBee

  I have been following along this example to load .obj Model using three.js. Since I needed more than one model to load so I tried this loader.addEventListener( 'load', function ( event ) { var object = event.content; object.position.y = - 80; scene.add( object ); }); loader.load( 'obj/model1.obj' ); loader.load( 'obj/model2.obj' ); First: I don't know whether this is the right approach or not since I searched but didn't find any tutorial loading more than one .obj models. Second: I want to be able to click different models on the screen. I tried this which doest not seem to work for me. Any suggestions on this?

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• Get UPN or email for logged in user in a .NET web application

  - by DrStalker

  I'm not a .NET developer, and I have a feeling this would be trivial for someone who is: I have a C# web application that makes user of the user credentials of the logged in user. Currently it uses the SID which comes from System.Security.Principal.WindowsIdentity.GetCurrent().User.Value I need to get either the users UPN login or email address (as defined in active directory) instead of the SID. GetCurrent() returns an object of type WindowsIdentity; looking in the details for WindowsIdentity Members: MSDN: WindowsIdentity Members I can't see anything that looks like it would give me either the UPN or email in there. How can I pull up that information to use, either by feeding the SID into some other function or calling something different in the first place.

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• How to access the jQuery event object in a Seaside callback

  - by Mef

  Basically, I want to translate the following into Seaside Smalltalk: $(".myDiv").bind('click', function(e) { console.log(e); }); Besides that I don't want to console.log the event, but access it in my ajax callback. The most promising approach seemed to be something like html div onClick: (html jQuery ajax callback: [:v | self halt] value: (???); with: 'Foo'. But I couldn't find any way to access the event that caused the callback. Intuitively, I would try html jQuery this event for the ??? part, but the Seaside jQuery wrapper doesn't know any message that comes close to event. Any help is appreciated. There has to be away to access the event data...

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• PHP: How to cast object to inherited class?

  - by andreyvlru

  I'd like to inherit PDOStatement class and use it in my website scripts. But I am frustrated how to get required object. PDO::query returns only direct PDOStatement object and looks like there are no other method to create PDOStatement object or inherited class. Initially i thought to move PDOStatement object to constructor of inherit class Something like that: $stmt = PDO -> query("select * from messages"); $messageCollection = new Messaging_Collection($stmt); But how to make instance of PDOStatement to inherited object (Messaging_Collection). It is a big question for me. class Messaging_Collection extends PDOStatement { public function __construct(PDOStatement $stmt) { //there i should to transform $stmt to $this // direct $this = $stmt is not possible // is there other right way? }

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• How do I connect to mysql from php ?

  - by roberto

  Hi guys. I'm working through examples from a book on php/mysql development. I'm working on a linux/apache environment. I've set up a database and a user. I attempt to connect with this line of code: $db_server = mysql_connect($db_hostname, $db_username, $db_password); I get this error: Warning: mysql_connect() [function.mysql-connect]: Access denied for user 'www-data'@'localhost' (using password: YES) in /var/www/hosts/dj/connect.php on line 3 unable to connect to database: Access denied for user 'www-data'@'localhost' (using password: YES) I can only guess what is happening here: I think www-data is a username for apache. Upon the database connection, the credentials being passed in to mysql are not those of my database user, but rather apache's own credentials. Is that what is happening here? How do I pass in the credentials I've defined for my user ?

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• How to compare two TXT files before send it to SQL

  - by adopilot

  I have to handle TXT dat files which coming from one embed device, My problem is in that device always sending all captured data but I want to take only difrences between two sending and do calculation on them. After calculation I send it to SQL using bulkinsert function. I want to extract data which is different according to first file I got from device. Lats say that device first time device send data like this in some.dat (ASCII) file 0000199991 0000199321 0000132913 0000232318 0000312898 On second calls to get data from device it is going to return all again (previous and next captured records) something like this 0000199991 0000199321 0000132913 0000232318 0000312898 9992129990 8782999022 2323423456 But this time I do want only to calculate and pass trough data added after first insert. I am trying to make Win Forms app using C# and Visual Studio 2008

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• Is there a literal notation for decimal in IronPython?

  - by jeroenh

  suppose I have the following IronPython script: def Calculate(input): return input * 1.21 When called from C# with a decimal, this function returns a double: var python = Python.CreateRuntime(); dynamic engine = python.UseFile("mypythonscript.py") decimal input = 100M; // input is of type Decimal // next line throws RuntimeBinderException: // "cannot implicitly convert double to decimal" decimal result = engine.Calculate(input); I seem to have two options: First, I could cast at the C# side: seems like a no-go as I might loose precision. decimal result = (decimal)engine.Calculate(input); Second option is to use System.Decimal in the python script: works, but pollutes the script, which should be understandable for my users... import clr import System def CalculateVAT(amount): return amount * System.Decimal(1.21) Is there a way to tell the DLR that the number 1.21 should be interpreted as a Decimal, much like I would use the '1.21M' notation in C#?

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• Google App Engine Email

  - by Frank

  I use the following method to send email in the Google App Engine servlet : void Send_Email(String From,String To,String Message_Text) { Properties props=new Properties(); Session session=Session.getDefaultInstance(props,null); try { Message msg=new MimeMessage(session); msg.setFrom(new InternetAddress(From,"nmjava.com Admin")); msg.addRecipient(Message.RecipientType.TO,new InternetAddress(To,"Ni , Min")); msg.setSubject("Servlet Message"); msg.setText(Message_Text); Transport.send(msg); } catch (Exception ex) { // ... } } But it doesn't work, have I missed anything ? Has anyone got the email function working ?

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• Autocomplete and Dynamic Parameter Passing

  - by abcParsing

  The code below works fine using jQuery UI 1.8 and jQuery 1.4.2 $("#sid_entry_box").autocomplete( {source:"autocomplete_sid.php?database="+database_name, minLength:4, delay:1000, enable:true, cacheLength:1 }); The database name is passed as a get parameter of the php call. In this application, I have two databases selected by a radio button. Since jQuery loads and assigns this function when the document is loaded, the database name is whatever was checked at that momemnt. What I really need to pass to the php call is the following: database=$("input[name=rf_database_option]:checked").val(); Is ther ean easy to understand way to be able to pass a dynamic dom value?

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• Flex TileList control, image loading issue

  - by ckenan

  I have a flex 3 TileList in wich a load several image (employee's headshot pictures). The image I'm loading in the TileList are stored in a DataBase (I use the ByteArray class and a Base 64 encoding to store the images in the DB). When I load the images in the TileList from the DB, there is no problem they are displayed correctly, but when I scroll down in the TileList and scroll up again, the position of the images is changing, so for example the image in first position can be now in the 3rd and so on .... Does somebody knows how to fix that ? Thanks in advance! PS : Here is the code of the ItemRenderer for the TileList private function init():void { img.load(data.imageData); } ]]

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• Use Javascript to copy Text from Label

  - by Josh

  Hello All- Label1 (asp.net control) is located inside Panel1 of my webpage and I have a button called bt. What is the Javascript to copy the Text from Label1 to the clipboard? Thanks, @ artlung, I placed the below code just outside of my form but inside the body. The last line of code I placed inside Panel1 of my form. Anything wrong with this code because nothing happens when I click the Copy to Clipboard button. <script language="JavaScript"> var clip = new ZeroClipboard.Client(); clip.addEventListener( 'mouseDown', function(client) { // set text to copy here clip.setText( document.getElementById('form1.Label1').value ); // alert("mouse down"); } ); clip.glue( 'd_clip_button' ); </script> The next line of code is above the script tags but inside Panel1 in my form <div id="d_clip_button">Copy To Clipboard</div>

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• Accordion - Expand/Collapse - but first panel is opened and screws it up

  - by lorenzium

  Hey guys, I've got an accordion which has the first panel opened on default by throwing in: $("h4#open").trigger('click'); (which triggers the first panel to act as if the h4 link were clicked, and thus opened...) But this seems to screw up the only way I can think of expanding / collapsing all the panels. I have this code to expand / collapse: $("a.ex-col").click(function(){ $("div.accordion div").slideToggle("slow"); return false; }); When using this, all the panels toggle open and close except any panel that happens to be open (or closed) at the time. How can I keep the default div opened on load, while also expanding / collapsing with the rest of them? Thanks.

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• Document.ready() failing on popup

  - by Seth Duncan

  I am using ASP.Net and jQuery/jQuery UI and I am trying to use the datepicker control. It works fine on every page, except when I have to use the popup (to add new data into the database and then i refresh the current page to reflect the new data being entered). It seems that document.ready() is failing when I use the popup. I can invoke the datepicker control manually with adding a click event to fire off the showcalendar function, however I want to try and make it work. Does anyone have any ideas of why a popup would fail document.ready() ? Thanks!

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