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• What are the worst examples of moral failure in the history of software engineering?

  - by Amanda S

  Many computer science curricula include a class or at least a lecture on disasters caused by software bugs, such as the Therac-25 incidents or Ariane 5 Flight 501. Indeed, Wikipedia has a list of software bugs with serious consequences, and a question on StackOverflow addresses some of them too. We study the failures of the past so that we don't repeat them, and I believe that rather than ignoring them or excusing them, it's important to look at these failures squarely and remind ourselves exactly how the mistakes made by people in our profession cost real money and real lives. By studying failures caused by uncaught bugs and bad process, we learn certain lessons about rigorous testing and accountability, and we make sure that our innocent mistakes are caught before they cause major problems. There are kinds of less innocent failure in software engineering, however, and I think it's just as important to study the serious consequences caused by programmers motivated by malice, greed, or just plain amorality. Thus we can learn about the ethical questions that arise in our profession, and how to respond when we are faced with them ourselves. Unfortunately, it's much harder to find lists of these failures--the only one I can come up with is that apocryphal "DOS ain't done 'til Lotus won't run" story. What are the worst examples of moral failure in the history of software engineering?

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• Strange resource not found issue?

  - by xBroak

  i seem to be having a very strange problem, when the app is run on my test phone it works perfectly, and plays a sound from the raw folder via soundpool on button press, however when i submit my app to testing after building it it crashes on 120+ devices for 'Resource not found' codes below: Please also note, the file is in fact there, in both the R file, in the compiled APK file and i have also cleaned numerous times. http://www.appthwack.com/public/FUVGFZn42q '01-03 21:09:36.828 26762 26762 W System.err: java.lang.RuntimeException: Unable to start activity ComponentInfo{appinventor.ai_Broak.PaintballWiz/com.muo.paintballwiz.PaintballWiz}: android.content.res.Resources$NotFoundException: File res/raw/pballshot.ogg from drawable resource ID #0x7f050000 - 1 occurrence' soundPool = new SoundPool(4, AudioManager.STREAM_MUSIC, 100); //soundPoolMap = new SparseIntArray(); soundPoolMap = new HashMap<Integer, Integer>(); // soundPoolMap.put(soundID, soundPool.load(this, R.raw.midi_sound, 1)); int myAudioFile = getResId("pballshot", R.raw.class); soundPoolMap.put(soundID, soundPool.load(PaintballWiz.this, myAudioFile, 1)); audioManager = (AudioManager) getSystemService(Context.AUDIO_SERVICE); curVolume = audioManager .getStreamVolume(AudioManager.STREAM_MUSIC); maxVolume = audioManager .getStreamMaxVolume(AudioManager.STREAM_MUSIC); leftVolume = curVolume / maxVolume; rightVolume = curVolume / maxVolume; soundPool.play(soundID, leftVolume, rightVolume, priority, no_loop, normal_playback_rate); soundPool.play(soundID, 0, 0, 1, -1, 1f);

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• Liferay Document Management System Workflow

  - by Rajkumar

  I am creating a DMS in Liferay. So far I could upload documents in Liferay in document library. And also i can see documents in document and media portlet. The problem is though status for the document is in pending state, the workflow is not started. Below is my code. Anyone please help. Very urgent. Folder folder = null; // getting folder try { folder = DLAppLocalServiceUtil.getFolder(10181, 0, folderName); System.out.println("getting folder"); } catch(NoSuchFolderException e) { // creating folder System.out.println("creating folder"); try { folder = DLAppLocalServiceUtil.addFolder(userId, 10181, 0, folderName, description, serviceContext); } catch (PortalException e3) { // TODO Auto-generated catch block e3.printStackTrace(); } catch (SystemException e3) { // TODO Auto-generated catch block e3.printStackTrace(); } } catch (PortalException e4) { // TODO Auto-generated catch block e4.printStackTrace(); } catch (SystemException e4) { // TODO Auto-generated catch block e4.printStackTrace(); } // adding file try { System.out.println("New File"); fileEntry = DLAppLocalServiceUtil.addFileEntry(userId, 10181, folder.getFolderId(), sourceFileName, mimeType, title, "testing description", "changeLog", sampleChapter, serviceContext); Map<String, Serializable> workflowContext = new HashMap<String, Serializable>(); workflowContext.put("event",DLSyncConstants.EVENT_CHECK_IN); DLFileEntryLocalServiceUtil.updateStatus(userId, fileEntry.getFileVersion().getFileVersionId(), WorkflowConstants.ACTION_PUBLISH, workflowContext, serviceContext); System.out.println("after entry"+ fileEntry.getFileEntryId()); } catch (DuplicateFileException e) { } catch (PortalException e1) { // TODO Auto-generated catch block e1.printStackTrace(); } catch (SystemException e1) { // TODO Auto-generated catch block e1.printStackTrace(); } } catch (PortalException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (SystemException e) { // TODO Auto-generated catch block e.printStackTrace(); } } return fileEntry.getFileEntryId(); } I have even used WorkflowHandlerRegistryUtil.startWorkflowInstance(companyId, userId, fileEntry.getClass().getName(), fileEntry.getClassPK, fileEntry, serviceContext); But still i have the same problem

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• Ldap_add() : Invalid Syntax

  - by Suezy

  I have a program here that uses the ldap_add, when i try to run the program, it displays an error: Warning: ldap_add() [function.ldap-add]: Add: Invalid syntax in /var/www/suey/costcenter.20090617.php on line 780 My lil' code here is: $ldapservers='ourServer'; $ds = ldap_connect($ldapservers); if ($ds){ $r = ldap_bind($ds, $ldaprootun, $ldaprootpw); $add = ldap_add($ds, "uid=$fuid, $ldapbasedn", $infonew); } ldapbasedn is set to o=ourGroup; infonew is an array of entries (person information) and am so sure that the array is not empty because i already tested it. the uid is not empty too. What could be wrong? Is it the entries(array)? or the server am trying to connect to? I tried testing the ldap_bind, and it also works well too..hmmm.. Pls help.. thanks! I found the problem.. it's in the index infonew["createdBy"] = getenv("REMOTE_USER"); it returns NULL! now, is that right?

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• code to ping websites works sometimes ...

  - by trustfundbaby

  I'm testing out a piece of code to ping a bunch of websites I own on a regular basis, to make sure they're up. I'm using rails and so far I have this hideous test action that I'm using to try it out (see below). The problem though, is that sometimes it works, and other times it won't ... sometimes it runs through the code just fine, other times, it seems to completely ignore the begin/rescue block ... a. I need help figuring out what the problem is b. And refactoring this to make it look respectable. Your help is much appreciated. require 'net/http' require 'uri' def ping @sites = NewsSource.all @sites.each do |site| if site.uri and !site.uri.empty? uri = URI.parse(site.uri) response = nil path = uri.path.blank? ? '/' : uri.path path = uri.query.blank? ? path : "#{path}?#{uri.query}" begin Net::HTTP.start(uri.host, uri.port) {|http| http.open_timeout = 30 http.read_timeout = 30 response = http.head(path) } if response.code.eql?('200') or response.code.eql?('301') or response.code.eql?('302') site.up = true else site.up = false end site.up_check_msg = response.message site.up_check_code = response.code rescue Errno::EBADF rescue Timeout::Error site.up = false site.up_check_msg = 'timeout' site.up_check_code = '408' end site.up_check_time = 0.seconds.ago site.save end end end

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• The Classic jQuery Tabs with Bing Maps Issue

  - by Justin

  Hello, I know that there are multiple issues with jQuery Tabs and using Maps. And I have seen the multiple fixes and I am half-way there. But I have the most obscure issue and hoping that someone might understand why. This is my code for the tabs $("#contactTabs").tabs({ spinner: 'Loading <img src="../images/icons/ajax-loader.gif" />' }); $('#contactTabs').bind('tabsshow', function(event, ui) { if (ui.panel.id == "Map") { GetMap(); } }); Which currently does not work. But I was doing some testing and added in an ALERT() to see if the "GetMap()" was even attempting to be loaded... so this was the code that I tested with, and it works just fine. $("#contactTabs").tabs({ spinner: 'Loading <img src="../images/icons/ajax-loader.gif" />' }); $('#contactTabs').bind('tabsshow', function(event, ui) { if (ui.panel.id == "Map") { alert("load map"); GetMap(); } }); So I haven't a clue why adding the ALERT() causes the map to load and removing the ALERT just doesn't load the map at all. Is there any clarification that someone can give me on this issue? Thank you in advance!

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• String Length Evaluating Incorrectly

  - by Justin R.

  My coworker and I are debugging an issue in a WCF service he's working on where a string's length isn't being evaluated correctly. He is running this method to unit test a method in his WCF service: // Unit test method public void RemoveAppGroupTest() { string addGroup = "TestGroup"; string status = string.Empty; string message = string.Empty; appActiveDirectoryServicesClient.RemoveAppGroup("AOD", addGroup, ref status, ref message); } // Inside the WCF service [OperationBehavior(Impersonation = ImpersonationOption.Required)] public void RemoveAppGroup(string AppName, string GroupName, ref string Status, ref string Message) { string accessOnDemandDomain = "MyDomain"; RemoveAppGroupFromDomain(AppName, accessOnDemandDomain, GroupName, ref Status, ref Message); } public AppActiveDirectoryDomain(string AppName, string DomainName) { if (string.IsNullOrEmpty(AppName)) { throw new ArgumentNullException("AppName", "You must specify an application name"); } } We tried to step into the .NET source code to see what value string.IsNullOrEmpty was receiving, but the IDE printed this message when we attempted to evaluate the variable: 'Cannot obtain value of local or argument 'value' as it is not available at this instruction pointer, possibly because it has been optimized away.' (None of the projects involved have optimizations enabled). So, we decided to try explicitly setting the value of the variable inside the method itself, immediately before the length check -- but that didn't help. // Lets try this again. public AppActiveDirectoryDomain(string AppName, string DomainName) { // Explicitly set the value for testing purposes. AppName = "AOD"; if (AppName == null) { throw new ArgumentNullException("AppName", "You must specify an application name"); } if (AppName.Length == 0) { // This exception gets thrown, even though it obviously isn't a zero length string. throw new ArgumentNullException("AppName", "You must specify an application name"); } } We're really pulling our hair out on this one. Has anyone else experienced behavior like this? Any tips on debugging it?

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• Button Onclick event (which is in codbehind) doesn't get triggered in MVC 2

  - by rksprst

  I had an MVC 1.0 web application that was in VS 2008; I just upgraded the project to VS 2010 which automatically upgraded MVC to 2.0. I have a bunch of viewpages have codebehind files that were manually added. The project worked fine before the upgrade, but now the onclick even't don't get triggered. I.e. I have an asp:button with an onclick event that points to a method in the codebehind. When you click the button, the onclick event doesn't get triggered. In fact, when you look at the Page variable, IsPostBack is false. This is really bizarre and I'm wondering if anyone know what happened and how to fix it. I'm thinking it has something to do with the changes in MVC 2.0; but I'm not sure. Any help is really appreciated, I've been trying to figure this out for a while. (deleting the codebehinds and moving that to the controller is not really an option since there is so many pages, moving back to vs 2008 is a last resort as I want to make use of some of the VS 2010 features like performance testing.)

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• Perl program for extracting the functions alone in a Ruby file

  - by thillaiselvan

  Hai all, I am having the following Ruby program. puts "hai" def mult(a,b) a * b end puts "hello" def getCostAndMpg cost = 30000 # some fancy db calls go here mpg = 30 return cost,mpg end AltimaCost, AltimaMpg = getCostAndMpg puts "AltimaCost = #{AltimaCost}, AltimaMpg = {AltimaMpg}" I have written a perl script which will extract the functions alone in a Ruby file as follows while (<DATA>){ print if ( /def/ .. /end/ ); } Here the <DATA> is reading from the ruby file. So perl prograam produces the following output. def mult(a,b) a * b end def getCostAndMpg cost = 30000 # some fancy db calls go here mpg = 30 return cost,mpg end But, if the function is having block of statements, say for example it is having an if condition testing block means then it is not working. It is taking only up to the "end" of "if" block. And it is not taking up to the "end" of the function. So kindly provide solutions for me. Example: def function if x > 2 puts "x is greater than 2" elsif x <= 2 and x!=0 puts "x is 1" else puts "I can't guess the number" end #----- My code parsing only up to this end Thanks in Advance!

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• PHPMailer with GMail: SMTP Error

  - by Abs

  Hello all, I am making use of PHPMailer to send mail through GMail. The code I use is straight from a tutorial and it works perfectly on my laptop. However, testing this on a Windows 2003 Server - it seems to always return an SMPT error: SMTP Error: Could not connect to SMTP host. Mailer Error: SMTP Error: Could not connect to SMTP host. Here is the settings I use in PHPMailer: include("phpmailer/class.phpmailer.php"); $mail = new PHPMailer(); $mail->IsSMTP(); $mail->SMTPAuth = true; // enable SMTP authentication $mail->SMTPSecure = "ssl"; // use ssl $mail->Host = "smtp.gmail.com"; // GMAIL's SMTP server $mail->Port = 465; // SMTP port used by GMAIL server Can I say with confidence that this isn't a port issue, since I am connecting to another server on port 465 and it is sending mail. If not, please explain. How can I resolve this issue? Thanks all for any help

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• JUnit confusion: use 'extend Testcase' or '@Test' ?

  - by Rabarberski

  I've found the proper use (or at least the documentation) of JUnit very confusing. This question serves both as a future reference and as a real question. If I've understood correctly, there are two main approaches to create and run a JUnit test: Approach A: create a class that extends TestCase, and start test methods with the word test. When running the class as a JUnit Test (in Eclipse), all methods starting with the word test are automatically run. import junit.framework.TestCase; public class DummyTestA extends TestCase { public void testSum() { int a = 5; int b = 10; int result = a + b; assertEquals(15, result); } } Approach B: create a 'normal' class and prepend a @Test annotation to the method. Note that you do NOT have to start the method with the word test. import org.junit.*; import static org.junit.Assert.*; public class DummyTestB { @Test public void Sum() { int a = 5; int b = 10; int result = a + b; assertEquals(15, result); } } Mixing the two seems not to be a good idea, see e.g. this stackoverflow question: Now, my questions(s): What is the preferred approach, or when would you use one instead of the other? Approach B allows for testing for exceptions by extending the @Test annotation like in @Test(expected = ArithmeticException.class). But how do you test for exceptions when using approach A? When using approach A, you can group a number of test classes in a test suite. TestSuite suite = new TestSuite("All tests");<br/> suite.addTestSuite(DummyTestA.class); suite.addTestSuite(DummyTestAbis.class);` But this can't be used with approach B (since each testclass should subclass TestCase). What is the proper way to group tests for approach B?

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• Browser performance when combining image resizing with animated movement

  - by Steve Reichgut

  I have been tasked with the job of converting a Flash animation into HTML. The animation is rather complex and requires the need to move multiple images (9) from location (x,y) to location (x2,y2) while simultaneously increasing the image size from 215px wide to 930px wide. While doing some initial testing of this animation with just 1-2 images, I noticed a lot of choppiness in FF handling of this animation. To try and isolate the problem, I removed the dynamic resizing of the animation and just moved it from point A to point B. What was interesting was that I saw the same behavior when simply moving a 930px image that was resized down to 215px (via the CSS width or inline width properties). When I try the same animation with a different image that is actually 215px wide, it performed smoothly. I then tried the same animation with the original 930px wide image (with no resizing) and it performed well also. This makes me wonder if the browser is having to "resize" the image down to 215px each time it is moved which is causing the choppiness. Is this a correct assumption? If so, is there any other way to optimize the animation to allow for simultaneous image resizing and image movement? Notes: 1) One optimization I have done is to position the images absolutely in order to minimize the reflow process. 2) I have tested the animation using both jQuery and the fX animation framework.

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• Is there a useDirtyFlag option for Tomcat 6 cluster configuration?

  - by kevinjansz

  In Tomcat 5.0.x you had the ability to set useDirtyFlag="false" to force replication of the session after every request rather than checking for set/removeAttribute calls. <Cluster className="org.apache.catalina.cluster.tcp.SimpleTcpCluster" managerClassName="org.apache.catalina.cluster.session.SimpleTcpReplicationManager" expireSessionsOnShutdown="false" **useDirtyFlag="false"** doClusterLog="true" clusterLogName="clusterLog"> ... The comments in the server.xml stated this may be used to make the following work: <% HashMap map = (HashMap)session.getAttribute("map"); map.put("key","value"); %> i.e. change the state of an object that has already been put in the session and you can be sure that this object still be replicated to the other nodes in the cluster. According to the Tomcat 6 documentation you only have two "Manager" options - DeltaManager & BackupManager ... neither of these seem to allow this option or anything like it. In my testing the default setup: <Cluster className="org.apache.catalina.ha.tcp.SimpleTcpCluster"/> where you get the DeltaManager by default, it's definitely behaving as useDirtyFlag="true" (as I'd expect). So my question is - is there an equivalent in Tomcat 6? Looking at the source I can see a manager implementation "org.apache.catalina.ha.session.SimpleTcpReplicationManager" which does have the useDirtyFlag but the javadoc comments in this state it's "Tomcat Session Replication for Tomcat 4.0" ... I don't know if this is ok to use - I'm guessing not as it's not mentioned in the main cluster configuration documentation.

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• Blackberry application works in simulator but not device

  - by Kai

  I read some of the similar posts on this site that deal with what seems to be the same issue and the responses didn't really seem to clarify things for me. My application works fine in the simulator. I believe I'm on Bold 9000 with OS 4.6. The app is signed. My app makes an HTTP call via 3G to fetch an XML result. type is application/xhtml+xml. In the device, it gives no error. it makes no visual sign of error. I tell the try catch to print the results to the screen and I get nothing. HttpConnection was taken right out of the demos and works fine in sim. Since it gives no error, I begin to reflect back on things I recall reading back when the project began. deviceside=true? Something like that? My request is simply HttpConnection connection = (HttpConnection)Connector.open(url); where url is just a standard url, no get vars. Based on the amount of time I see the connection arrows in the corner of the screen, I assume the app is launching the initial communication to my server, then either getting a bad result, or it gets results and the persistent store is not functioning as expected. I have no idea where to begin with this. Posting code would be ridiculous since it would be basically my whole app. I guess my question is if anyone knows of any major differences with device versus simulator that could cause something like http connection or persistent store to fail? A build setting? An OS restriction? Any standard procedure I may have just not known about that everyone should do before beginning device testing? Thanks

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• deactivate ' pin to start ' on Application List page when pinning an app via code using C#?

  - by Ahmed Ali

  i'm creating a windows phone app ,where i've put a button to pin the app to start screen , but when press and hold the app icon on application list screen i find that the pin to start option can be used ShellTile TileToFind = ShellTile.ActiveTiles.FirstOrDefault(x => x.NavigationUri.ToString().Contains("MainPage.xaml")); // Create the Tile if we didn't find that it already exists. if (TileToFind == null) { // Create the Tile object and set some initial properties for the Tile. // The Count value of 12 shows the number 12 on the front of the Tile. Valid values are 1-99. // A Count value of 0 indicates that the Count should not be displayed. StandardTileData NewTileData = new StandardTileData { BackgroundImage = new Uri("300.png", UriKind.Relative), Title = "apptitle", BackTitle = "title", BackContent = "testing ", BackBackgroundImage = null }; // Create the Tile and pin it to Start. This will cause a navigation to Start and a deactivation of our app. ShellTile.Create(new Uri("/MainPage.xaml", UriKind.Relative), NewTileData); } else { MessageBox.Show("Already Pinned"); } how can i disable the user from pinning the application again from application list screen

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• Working with Decimal fields in SSIS

  - by CoffeeAddict

  I'm using SQL Server 2008 w/SP2. I've got an incoming decimal(9,2) field incoming through my OLE DB transformation to my recordset destination transformation. It's like it's reading it as something other than a decimal? I don't know..I'm not an SSIS guru. So continuing on...the problem I have starts here with me trying to stuff the value into a variable for this decimal field. In a foreach loop, I have a variable to represent this decimal field so I can work with it. The first problem that I believe is pretty well known is SSIS variables do not have a decimal type. And from my own testing and what I've read out there, people are using type object for the variable to make SSIS "happy" with decimal values? It makes mine happy. But, then in my foreach loop, I have a for loop. And inside that I'm using an E*xecute SQL Task transformation*. In it, I need to create a parameter mapping to my variable so I can work with that decimal field in my T-SQL call in here. So now I see a type decimal for the parameter and use it and set that to point to my variable. When I run SSIS and it hits my SQL call, I get this in my output window.: The type is not supported.DBTYPE_DECIMAL So I am hitting a wall here. All I wanna do is work with a decimal!!!

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• Jquery problem - cant expand the row above in a table

  - by apg1985

  Hi People, What I cant figure out is how I would toggle a row in a table using the one below it. So say I have a table with 2 rows the first contains content and the one below contains a button, when the page loads the content row is hidden and when you click the button it toggles the content row on and off. In the example the first table works but the second does not, I need the second one to work. <!DOCTYPE HTML> <html> <head> <title>Testing Horizontal Accordion</title> <script type="text/javascript" src="jquery.js"></script> <script type="text/javascript"> $(document).ready(function() { $(".sectionhead").toggle( function() { $(this).next("tr").hide(); }, function() { $(this).next("tr").show(); } ) }); </script> </head> <body> <table> <tr class="sectionhead"><td></td></tr> <tr class="child"><td>child</td></tr> </table> <br> <table> <tr class="child"><td>child</td></tr> <tr class="sectionhead"><td></td></tr> </table> </body> </html>

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• MySql too many connections

  - by MichaelMcCabe

  I hate to bring up a question which is widely asked on the web, but I cant seem to solve it. I started a project a while back and after a month of testing, I hit a "Too many connections" error. I looked into it, and "Solved" it by increasing the max_connections. This then worked. Since then more and more people started to use it, and it hit again. When I am the only user on the site, i type "show processlist" and it comes up with about 50 connections which are still open (saying "Sleep" in the command). Now, I dont know enough to speculate why these are open, but in my code I tripple checked and every connection I open, I close. ie. public int getSiteIdFromName(String name, String company)throws DataAccessException,java.sql.SQLException{ Connection conn = this.getSession().connection(); Statement smt = conn.createStatement(); ResultSet rs=null; String query="SELECT id FROM site WHERE name='"+name+"' and company_id='"+company+"'"; rs=smt.executeQuery(query); rs.next(); int id=rs.getInt("id"); rs.close(); smt.close(); conn.close(); return id; } Every time I do something else on the site, another load of connections are opened and not closed. Is there something wrong with my code? and if not, what could be the problem?

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• Admob banner not getting remove from superview

  - by Gamer

  I am developing one 2d game using cocos2d framework, in this game i am using admob for advertising, in some classes not in all classes but admob banner is visible in every class and after some time game getting crash also. I am not getting how admob banner is comes in every class in fact i have not declare in Rootviewcontroller class. can any one suggest me how to integrate Admob in cocos2d game, i want Admob banner in particular classes not in every class, I am using latest google admob sdk, my code is below: Thanks in advance ` -(void)AdMob{ NSLog(@"ADMOB"); CGSize winSize = [[CCDirector sharedDirector]winSize]; // Create a view of the standard size at the bottom of the screen. if (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPad){ bannerView_ = [[GADBannerView alloc] initWithFrame:CGRectMake(size.width/2-364, size.height - GAD_SIZE_728x90.height, GAD_SIZE_728x90.width, GAD_SIZE_728x90.height)]; } else { // It's an iPhone bannerView_ = [[GADBannerView alloc] initWithFrame:CGRectMake(size.width/2-160, size.height - GAD_SIZE_320x50.height, GAD_SIZE_320x50.width, GAD_SIZE_320x50.height)]; } if (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPad) { bannerView_.adUnitID =@"a15062384653c9e"; } else { bannerView_.adUnitID =@"a15062392a0aa0a"; } bannerView_.rootViewController = self; [[[CCDirector sharedDirector]openGLView]addSubview:bannerView_]; [bannerView_ loadRequest:[GADRequest request]]; GADRequest *request = [[GADRequest alloc] init]; request.testing = [NSArray arrayWithObjects: GAD_SIMULATOR_ID, nil]; // Simulator [bannerView_ loadRequest:request]; } //best practice for removing the barnnerView_ -(void)removeSubviews{ NSArray* subviews = [[CCDirector sharedDirector]openGLView].subviews; for (id SUB in subviews){ [(UIView*)SUB removeFromSuperview]; [SUB release]; } NSLog(@"remove from view"); } //this makes the refreshTimer count -(void)targetMethod:(NSTimer *)theTimer{ //INCREASE OF THE TIMER AND SECONDS elapsedTime++; seconds++; //INCREASE OF THE MINUTOS EACH 60 SECONDS if (seconds>=60) { seconds=0; minutes++; [self removeSubviews]; [self AdMob]; } NSLog(@"TIME: %02d:%02d", minutes, seconds); } `

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• Could my forms be hacked.

  - by Mike Sandman

  Hi there, I posted a question yesterday, which I intend to get back to today however I wrote some JavaScript as a first line of prevention against XSS. However when testing this on my live server I catch some invalid input as the javascript catches the php section. My form uses post and php isn't in my form items (i haven't typed it in). Could this be picking up the form action or something? I'm baffeled, Any ideas Here is my code, it is triggered on the submit button. function validateForBadNess(){ var theShit = new Array("*","^", "$", "(",")","{", "}","[", "]","\", "|", "'","/","?",",","=","","gt","lt", "<","script","`","´","php"); var tagName = new Array(); tagName[0] = "input"; tagName[1] = "select"; tagName[2] = "textbox"; tagName[3] = "textarea"; for (ms=0;ms // loop through the elements of the form var formItems = document.getElementsByTagName(tagName[ms]); for (var xs=0;xs var thisString = formItems[xs].value; // loop through bad array for (zs in theShit){ //alert(thisString + " " + thisString.indexOf(theShit[zs])) if(thisString.indexOf(theShit[zs]) >= 0){ alert("Sorry but the following character: " + theShit[zs] + " is not permitted. Please omit it from your input.\nIf this is part of your password please contact us to heave your password reset.") return false; } } // loop for formitems } // tagName toop } // original condition }

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• PostgreSQL, Foreign Keys, Insert speed & Django

  - by Miles

  A few days ago, I ran into an unexpected performance problem with a pretty standard Django setup. For an upcoming feature, we have to regenerate a table hourly, containing about 100k rows of data, 9M on the disk, 10M indexes according to pgAdmin. The problem is that inserting them by whatever method literally takes ages, up to 3 minutes of 100% disk busy time. That's not something you want on a production site. It doesn't matter if the inserts were in a transaction, issued via plain insert, multi-row insert, COPY FROM or even INSERT INTO t1 SELECT * FROM t2. After noticing this isn't Django's fault, I followed a trial and error route, and hey, the problem disappeared after dropping all foreign keys! Instead of 3 minutes, the INSERT INTO SELECT FROM took less than a second to execute, which isn't too surprising for a table <= 20M on the disk. What is weird is that PostgreSQL manages to slow down inserts by 180x just by using 3 foreign keys. Oh, disk activity was pure writing, as everything is cached in RAM; only writes go to the disks. It looks like PostgreSQL is working very hard to touch every row in the referred tables, as 3MB/sec * 180s is way more data than the 20MB this new table takes on disk. No WAL for the 180s case, I was testing in psql directly, in Django, add ~50% overhead for WAL logging. Tried @commit_on_success, same slowness, I had even implemented multi row insert and COPY FROM with psycopg2. That's another weird thing, how can 10M worth of inserts generate 10x 16M log segments? Table layout: id serial primary, a bunch of int32, 3 foreign keys to small table, 198 rows, 16k on disk large table, 1.2M rows, 59 data + 89 index MB on disk large table, 2.2M rows, 198 + 210MB So, am I doomed to either drop the foreign keys manually or use the table in a very un-Django way by defining saving bla_id x3 and skip using models.ForeignKey? I'd love to hear about some magical antidote / pg setting to fix this.

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• (Not So) Silly Objective-C inheritance problem when using property - GCC Bug?

  - by Ben Packard

  Update 2 - Many people are insisting I need to declare an iVar for the property. Some are saying not so, as I am using Modern Runtime (64 bit). I can confirm that I have been successfully using @property without iVars for months now. Therefore, I think the 'correct' answer is an explanation as to why on 64bit I suddenly have to explicitly declare the iVar when (and only when) i'm going to access it from a child class. The only one I've seen so far is a possible GCC bug (thanks Yuji). Not so simple after all... Update - I messed up one line of the original copy and paste - corrected. The @property call was missing (nonatomic, retain) but is a red herring - STILL NEED AN ANSWER! Thanks. I've been scratching my head with this for a couple of hours - I haven't used inheritance much. Here I have set up a simple Test B class that inherits from Test A, where an ivar is declared. But I get the compilation error that the variable is undeclared. This only happens when I add the property and synthesize declarations - works fine without them. TestA Header: #import <Cocoa/Cocoa.h> @interface TestA : NSObject { NSString *testString; } @end TestA Implementation is empty: #import "TestA.h" @implementation TestA @end TestB Header: #import <Cocoa/Cocoa.h> #import "TestA.h" @interface TestB : TestA { } @property (nonatomic, retain) NSString *testProp; @end TestB Implementation (Error - 'testString' is undeclared) #import "TestB.h" @implementation TestB @synthesize testProp; - (void)testing{ NSLog(@"test ivar is %@", testString); } @end

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• Have to login twice. PHP sessions and login troubles with Chrome and Opera.

  - by Robert

  The problem I am encountering is that for my login form I have to login twice for the session to register properly, but only in Chrome (my version is 4.0.249.89) and Opera (my version is 10.10). Here is the stripped down code that I am testing on: Login Page: session_start(); $_SESSION['user_id'] = 8; $_SESSION['user_name'] = 'Jim'; session_write_close(); header('Location: http://www.my-domain-name.com/'); exit(); Home Page: session_start(); if ( isset($_SESSION['user_id']) ) { echo "You are logged in!"; } else { echo "You are NOT logged in!"; } Logout Page: session_start(); session_unset(); session_destroy(); header('Location: http://www.my-domain-name.com/'); exit(); Currently, under a fresh load with no cookies, if I go to my-domain-name.com/login/ it will redirect to the home page and say "You are NOT logged in!" but if I go there again it will say "You are logged in!". Any ideas? Thanks for your help.

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• Calculate posterior distribution of unknown mis-classification with PRTools in MATLAB

  - by Samuel Lampa

  I'm using the PRTools MATLAB library to train some classifiers, generating test data and testing the classifiers. I have the following details: N: Total # of test examples k: # of mis-classification for each classifier and class I want to do: Calculate and plot Bayesian posterior distributions of the unknown probabilities of mis-classification (denoted q), that is, as probability density functions over q itself (so, P(q) will be plotted over q, from 0 to 1). I have that (math formulae, not matlab code!): P(q|k,N) = Posterior * Prior / Normalization constant = P(k|q,N) * P(q|N) / P(k|N) The prior is set to 1, so I only need to calculate the posterior and normalization constant. I know that the posterior can be expressed as (where B(N,k) is the binomial coefficient): P(k|q,N) = B(N,k) * q^k * (1-q)^(N-k) ... so the Normalization constant is simply an integral of the posterior above, from 0 to 1: P(k|N) = B(N,k) * integralFromZeroToOne( q^k * (1-q)^(N-k) ) (The Binomial coefficient ( B(N,k) ) can be omitted thoughappears in both the posterior and normalization constant, so it can be omitted.) Now, I've heard that the integral for the normalization constant should be able to be calculated as a series ... something like: k!(N-k)! / (N+1)! Is that correct? (I have some lecture notes from with this series, but can't figure out if it is for the normalization constant integral, or for the posterior distribution of mis-classification (q)) Also, hints are welcome as how to practically calculate this? (factorials are easily creating truncation errors right?) ... AND, how to practically calculate the final plot (the posterior distribution over q, from 0 to 1).

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• Payment gateways and XSS

  - by Rowan Parker

  Hi all, I'm working on a website which takes payment from a customer. I'm using Kohana 2.3.4 and have created a library to handle the payment gateway I use (www.eway.com.au). Basically I'm just using their sample code, copied into it's own class. Anyway, the code works fine and I can make payments, etc. The issue I have is when the payment gateway is returning the user to my site. The payment gateway uses HTTPS so that is secure, and it is sending the user back to a HTTPS page on my site. However I have the NoScript plugin installed in Firefox, and when I get sent back to the page on my website (which also handles storing the transaction data) I get an error message saying that NoScript has blocked a potential XSS attack. Now I understand why it's unsecure (POST data being sent across two different domains) but what should I be doing instead? Obviously during my testing here I temporarily disable NoScript and it all works fine, but I can't rely on that for the end users. What's the best practice here?

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