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• Java Swing: how to add an image to a JPanel ?

  - by Leonel

  I have a JPanel to which I'd like to add JPEG and PNG images that I generate on the fly. All the examples I've seen so far in the Swing Tutorials, specially in the Swing examples use ImageIcons. I'm generating these images as byte arrays, and they are usually larger than the common icon they use in the examples, at 640x480. Is there any (performance or other) problem in using the ImageIcon class to display an image that size in a JPanel ? What's the usual way of doing it ? How to add an image to a JPanel without using the ImageIcon class ? Edit: A more careful examination of the tutorials and the API shows that you cannot add an ImageIcon directly to a JPanel. Instead, they achieve the same effect by setting the image as an icon of a JLabel. This just doesn't fill right...

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• Javascript how many characters replaced in a regex?

  - by macca1

  I am sanitizing an input field and manually getting and setting the caret position in the process. With some abstraction, here's the basic idea: <input type="text" onkeyup"check(this)"> And javascript... function check(element) { var charPosition = getCaretPosition(element); $(element).val( sanitize( $(element).val() ) ); setCaretPosition(element, charPosition); } function sanitize(s) { return s.replace(/[^a-zA-Z0-9\s]/g, ''); } This is working fine except when a character does actually get sanitized, my caret position is off by one. Basically I'd like a way to see if the sanitize function has actually replaced a character (and at what index) so then I can adjust the charPosition if necessary. Any ideas?

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• Gitosis Directories of repositories per user?

  - by Ibrahim

  I was just wondering, is there a way to set up gitosis so that a user would have their own directory to which they could push any number of repositories that they want, and essentially have admin privs on that directory? This might be kind of confusing, but essentially I want something like how on github all your repositories are accessible at urls like [email protected]:username/repofoo.git . I realize that setting up each repo is a somewhat manual process that could be automated via a script, like I assume github does, but is there any way to do something like this overall, minus the automated repository creation? I guess I'm open to trying to set up gitorious or something if it allows this, but gitosis works pretty well for me right now and it was dead easy to set up, and I've heard that gitorious is not so easy. Thanks! I've heard of other forks/clones of gitosis that have per branch permissions like gitolite, but I'm not sure whether I want to use one of those unless they have other compelling features and are as well documented and easy to use as gitosis.

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• Django on Dreamhost - testing/sand box environment

  - by elequ

  I've been using webfaction for all my django needs for the last couple of years but have had a high traffic site fall in my lap that dreamhost are probably better suited to handling. To set up and experiment with a site with webfaction there are your [user].webfactional.com accounts. Which is sweet. Equivalently Dreamhost also offers [name].dreamhosters.com Yet this doesn't seem to work with my database and this doesn't seem to be playing nice with setting up django or passenger_wsgi. So I'm wondering if I'm interpreting the documentation correctly to suggest that in order to make a site that depends on passenger it needs to be running from an active domain. The documentation is really implicit, I'm baffled. Has anyone set up a testing/sand box environment for django using dreamhost, or know how to?

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• How to get a flat, non-interpolated color when using vertex shaders.

  - by Brett

  Hi, Is there a way to achieve this? If I draw lines like this glShadeModel(GL_FLAT); glBegin(GL_LINES); glColor3f(1.0, 1.0, 0.0); glVertex3fv(bottomLeft); glVertex3fv(topRight); glColor3f(1.0, 0.0, 0.0); glVertex3fv(topRight); glVertex3fv(topLeft); . . (draw a square) . . glEnd(); I get the desired result (a different colour for each edge) but I want to be able to calculate the fragment values in a shader. If I do the same after setting up my shader program I always get interpolated colors between vertices. Is there a way around this? (would be even better if I could get the same results using quads) Thanks

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• Efficient heaps in purely functional languages

  - by Kim

  As an exercise in Haskell, I'm trying to implement heapsort. The heap is usually implemented as an array in imperative languages, but this would be hugely inefficient in purely functional languages. So I've looked at binary heaps, but everything I found so far describes them from an imperative viewpoint and the algorithms presented are hard to translate to a functional setting. How to efficiently implement a heap in a purely functional language such as Haskell? Edit: By efficient I mean it should still be in O(n*log n), but it doesn't have to beat a C program. Also, I'd like to use purely functional programming. What else would be the point of doing it in Haskell?

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• Java swing examples - Ants running around a world getting food from piles?

  - by Charlie

  I haven't done any swing programming in a while, so I'm looking for some GUI examples that are at least close to what I'm trying to do. The gui that I'll need to be representing is small nodes (let's say ants) travelling around collecting food from food piles (which just means small nodes travelling to bigger nodes). Once the node (ant) takes a piece of food, the pile shrinks a bit and the ant takes it back home (to ANOTHER circle). This SOUNDS pretty trivial, but all of the boilerplate involved in setting up a java GUI just makes little logical sense to me, and the GUI is such a small piece of my project. Any examples that would be great for this style of project would be greatly appreciated. Thanks!

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• question about fgets

  - by user105033

  Is this safe to do? (does fgets terminate the buffer with null) or should I be setting the 20th byte to null after the call to fgets before i call clean. // strip new lines void clean(char *data) { while (*data) { if (*data == '\n' || *data == '\r') *data = '\0'; data++; } } // for this, assume that the file contains 1 line no longer than 19 bytes // buffer is freed elsewhere char *load_latest_info(char *file) { FILE *f; char *buffer = (char*) malloc(20); if (f = fopen(file, "r")) if (fgets(buffer, 20, f)) { clean(buffer); return buffer; } free(buffer); return NULL; }

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• Initializing "new users" in Rails

  - by mathee

  I'm creating a Ruby on Rails application, and I'm trying to create/login/logout users. This is the schema for Users: create_table "users", :force => true do |t| t.string "first_name" t.string "last_name" t.text "reputation" t.integer "questions_asked" t.integer "answers_given" t.string "request" t.datetime "created_at" t.datetime "updated_at" t.string "email_hash" t.string "username" t.string "hashed_password" t.string "salt" end The user's personal information (username, first/last names, email) is populated through a POST. Other things such as questions_asked, reputation, etc. are set by the application, so should be initialized when we create new users. Right now, I'm just setting each of those manually in the create method for UsersController: def create @user = User.new(params[:user]) @user.reputation = 0 @user.questions_asked = 0 @user.answers_given = 0 @user.request = nil ... end Is there a more elegant/efficient way of doing this?

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• how to write mute logic when mute state is unknown

  - by Delan Azabani

  I'm writing an indicator-sound clone for OSS4. Setting the volume works fine now, but I'm having trouble with the muting aspect of my program. A couple of facts about muting in OSS4: vmix doesn't have a mute (and we use vmix for volume control) also, the 'media keys' way of controlling volume doesn't set a mute control, but rather, volume = 0 The problem with this is, when reading the vmix volume and encountering zero, we don't know if the user has actually set it to zero, or has it set to some other value, but has mute on. How should I write my muting logic? git code, if that helps

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• Multiple calls to AlarmManager.setRepeating deliver the same Intent/PendingIntent extra values, but

  - by Chris Boyle

  Solved while writing this question, but posting in case it helps anyone: I'm setting multiple alarms like this, with different values of id: AlarmManager alarms = (AlarmManager)context.getSystemService( Context.ALARM_SERVICE); Intent i = new Intent(MyReceiver.ACTION_ALARM); // "com.example.ALARM" i.putExtra(MyReceiver.EXTRA_ID, id); // "com.example.ID", 2 PendingIntent p = PendingIntent.getBroadcast(context, 0, i, 0); alarms.setRepeating(AlarmManager.RTC_WAKEUP, nextMillis, 300000, p); // 5 mins ...and receiving them like this: public void onReceive(Context context, Intent intent) { if (intent.getAction().equals(ACTION_ALARM)) { // It's time to sound/show an alarm final long id = intent.getLongExtra(EXTRA_ID, -1); The alarm is delivered to my receiver at the right times, but often with EXTRA_ID set to the wrong value: it's a value that I have used at some point, just not the one that I wanted delivered at that particular time.

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• What is the big deal with SSL?

  - by xarzu

  What is the big deal with SSL? My interenet website hosting provider has sold me an SSL line. All I know is that for what I want to do with PayPal, I need to have a folder that is denoted beginning with https:// and this is what an SSL line is. But it seems that they have a hard time setting it up. I wonder if I can just go ahead and do it for myself. I mean, some third party has send me confirmation and even what seems to be some sort of long numeric certificate.

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• Using GIT with Joomla

  - by kwhohasamullet

  Hi Guys, We are a web design company going down the road of setting up a revision management system and all the processes around how we are going to use it etc. We mainly develop our websites on a Joomla and what i wanted to know is how other companies manage their repositories when dealing with a CMS. We mainly deal with template building as well as occasionally customising components/plugins we installed. My main questions are: -Is the best way to store all files (including the Joomla files) in the repo or just files that you make/ change yourself? -Do you keep a copy of the Database somewhere to account for database changes Thanks in advance

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• Java webapp: where/how to automatically set each picture's width/height

  - by NoozNooz42

  For several reasons, a lot of "webmaster guides" (like Google and Yahoo!'s webmaster guides/guidelines) repeats several times that it is better to always put the width and height attribute of the img tag. One of the most obvious reason is that the elements in the page won't seem to be "jumping around" to a new location after every picture is loaded (always setting the correct width/height sure gets rid of this behavior). And there are other reasons to follow these guidelines / best practices. So: if we consider that these are indeed good practices if there are a lot of pictures and they are changing often if pictures aren't changing between two .war re-deploy (that is: there's no user-contributed picture) if we don't want to manually edit all these width/height attributes How do we automatically/programmatically serve HTML pages where every img tag have their width/height attribute correctly set as the best practice recommend?

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• How do you change the style of cell in a JQuery.DataTable?

  - by Sephrial

  Hello fellow coders, I have a question about setting the style attributes for a data cell in the jQuery.DataTable. I was able to set the width for each column when initializing the dataTable using the following: oTable = $('#example').dataTable( { "aoColumns" : [ { sWidth: '40%' }, { sWidth: '60%' } ] } ); However, now I want to change the alignment for the second column like so: style="text-align: right;". I am adding rows dynamically: /* Global var for counter */ var giCount = 2; function fnClickAddRow() { oTable.fnAddData( [ 'col_1', 'col_2' ] ); giCount++; } Can you tell me how I can select the second cell of the added row after it's inserted? OR can you tell me how to set the style of the row before/during insertion? Any help would be greatly appreciated!

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• How to have localized style when writing cell with xlwt

  - by lfagundes

  I'm writing an Excel spreadsheet with Python's xlwt and I need numbers to be formatted using "." as thousands separator, as it is in brazilian portuguese language. I have tried: style.num_format_str = r'#,##0' And it sets the thousands separator as ','. If I try setting num_format_str to '#.##0', I'll get number formatted as 1234.000 instead of 1.234. And if I open document in OpenOffice and format cells, I can set the language of the cell to "Portuguese (Brazil)" and then OpenOffice will show the format code as being "#.##0", but I don't find a way to set the cell's language to brazilian portuguese. Any ideas?

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• How to make an HTTP request in a separate thread with timeout?

  - by Vitaly

  Hi, I haven't programmed in Delphi for a while and frankly didn't think I'll ever have to but... Here I am, desperately trying to find some information on the matter and it's so scarce nowadays, I can't find anything. So maybe you guys could help me out. Currently my application uses Synapse library to make HTTP calls, but it doesn't allow for setting a timeout. Usually, that's not a big problem, but now I absolutely must to have a timeout to handle any connectivity issues nicely. What I'm looking for, is a library (synchronous or not) that will allow making HTTP requests absolutely transparent for the user with no visible or hidden delays. I can't immediately kill a thread right now, and with possibility of many frequent requests to the server that is not responding, it's no good.

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• Are database triggers evil?

  - by WW

  Are database triggers a bad idea? In my experience they are evil, because they can result in surprising side effects, and are difficult to debug (especially when one trigger fires another). Often developers do not even think of looking if there is a trigger. On the other hand, it seems like if you have logic that must occur evertime a new FOO is created in the database then the most foolproof place to put it is an insert trigger on the FOO table. The only time we're using triggers is for really simple things like setting the ModifiedDate.

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• Configuring Multiple ASP.NET MVC Sites To Use a Single Database For Authentication/Membership

  - by Maxim Z.

  Is it possible for two or more ASP.NET MVC sites to use a single SQL Server database for authentication and other things? Here's how I'm thinking of setting it up: I will combine the current database of each site into one single database, prefixing the tables with the name of the site they belong to. I currently have authentication tables generated by the asp.net_regsql.exe utility. How should I combine those tables? I'm guessing that the way to do it is to somehow set the "application_id" column in those tables... Thanks in advance.

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• Cannot install Ruby on CentOS

  - by James

  Hey folks, I just cannot install Ruby on my CentOS (which is also hosting a cPanel). sudo yum install ruby ruby-devel ruby-irb ruby-rdoc ruby-ri audit_log_user_command(): Connection refused Loaded plugins: fastestmirror Loading mirror speeds from cached hostfile base: mirror.sov.uk.goscomb.net updates: mirror.sov.uk.goscomb.net addons: mirror.sov.uk.goscomb.net extras: mirror.sov.uk.goscomb.net base | 1.1 kB 00:00 updates | 951 B 00:00 addons | 951 B 00:00 extras | 1.1 kB 00:00 Excluding Packages in global exclude list Finished Setting up Install Process Parsing package install arguments No package ruby available. No package ruby-devel available. No package ruby-irb available. No package ruby-rdoc available. No package ruby-ri available. Nothing to do What can be the problem? Thanks

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• Log4cxx sample program and steps to compile

  - by Jake

  Hi guys Hoping someone can help out.. I've been scouring the net for a simple how-to to get a good log4cxx program working, with steps on setting up the libraries, dependants, directives, library paths etc etc.. as of yet i've found a lot of valuable but disjointed information.. trying to pull it all together has been a bit of a nightmare, so i'm reaching out and wondering if any kind soul knows of, or could put together a simple how-to, to get a standard win32 console app running with either static or dynamically linked release mode log4cxx.. I have win32 binary releases of the libraries, and thanks to a very cool dude from "Must a blog have a name" I have a win32 project which can build log4cxx.. i just cant bloody use it :) It would be really helpful to me, and probably to others, to be able to refer to something like this and not 20 different pages, with different lists of libraries needed to download and install.. :) Here's hoping Thanks guys J

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• Deselecting a form input and waiting for a function before submitting

  - by blcArmadillo

  I have a form with an input field where a user enters a unique identifier. I then have some jQuery code that upon the user moving away from the input field (blur) goes out and fetches details about the part and populates some fields on the page. The problem is if the user clicks the submit button before moving out of the input field the jQuery code never has a chance to load in the data and populate the necessary fields. Whats the best way to go about doing this? I thought about maybe setting the focus to body and then having an infinite loop that keeps checking the page until all fields that should be filled in have been filled in but I feel like some sort of event based solution would be better than unpredictable infinite loops. Any ideas?

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• Communicate between content script and options page

  - by Gaurang Tandon

  I have seen many questions already and all are about background page to content script. Summary My extension has an options page, and a content script. The content script handles the storage functionality (chrome.storage manipulation). Whenever, a user changes a setting in the options page, I want to send a message to the content script to store the new data. My code: options.js var data = "abcd"; // let data chrome.tabs.query({ active: true, currentWindow: true }, function (tabs) { chrome.tabs.sendMessage(tabs[0].id, "storeData:" + data, function(response){ console.log(response); // gives undefined :( }); }); content script js chrome.runtime.onMessage.addListener(function(request, sender, sendResponse) { // not working }); My question: Why isn't the approach not working? Is there any other (better) approach for this procedure.

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• Windows IIS test server setup

  - by chopps

  hello everyone, I picked up a new server to do some testing and need of a little help in setting up my environment at home. Here is what I would like to do: The test server will be used to test new code and configurations for a SaaS product. I would like from my laptop to enter www.acme.com and have it hit the server. The server is connected to a wireless router. I have windows server 2008 with IIS running on an an IP of 192.168.1.4. What is the best way to set this up? I want to hit the test server for www.acme.com and not go out to the internet. Do i need to mess with the LMHosts file? Thanks for the help. Im sure its easy but have never done this before.

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• Managing Static Library project as a module like Framework on iOS project in Xcode4.

  - by Eonil

  (Solution Note, I'll answer immediately) Many people including me trying to make a kind of Static Library framework for iOS to archive some kind of modularity. Framework is best way to do this, but it doesn't provided by Apple, and workarounds don't work well. https://github.com/kstenerud/iOS-Universal-Framework/tree/master/Fake%20Framework/Templates Fake framework cannot be referenced from linking tab in Build Phases. Real framework needs modification of system setting. And still not work smoothly on every parts. Problem is static library need header files, and it's impossible to reference header files on project at another location on different project without some script. And script breaks IDE's file management abstraction. How can I use static library project like a convenient module manner? (just dragging project into another project to complete embedding)

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