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• Result of Long Positive Integers & Search and element in array..

  - by AGeek

  Hi, I have two Questions for which I cannot find answers by googling, but I find these questions very important for preparation.. Kindly explain only the logic, I will be able to code. In Search of Efficient Logic..... in terms of Memory and Time. WAP to add two long positive integers. What Data structure / data type we can use to store the numbers and result. What is the best way to search an element from an array in shortest time. Size of the array could be large enough, and any elements could be stored in the array(i.e. no range). Thanks.

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• Any reason why I shouldn't use couchdb for message passing or realtime activity streams?

  - by Up

  While using ampq or xmpp (rabbitmq or ejabbered that could have couchdb as backends) seems like a good fit to deliver real time updates about friend state in a social gaming platform where updates are small but frequent, I can't help but think why wouldn't couchdb be a good platform to deliver such updates? The main advantage I could think of is its ability to filter updates based on friends and availability of changes api, which makes developing such an application and managing it (including replication) quite easy compared to ampq or xmpp where you have to think about how to manage the pubsub nodes and who is subscribed to them at any point in time. However, I can't help but think this is too good to be true, I can't find information on what couchdb's shortcomings are. Somehow, it feels like using MySQL for message passing which is why I am hesitant to using it. Anyone have any experience in using couchdb for such applications? would you recommend another platform to use?

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• Secondary thread causes startup delay

  - by JK

  In my didFinishLaunchingWithOptions method I spawn a thread to perform some maintenance on my core data store. However, this increases the startup time by half a second. The startup view is a tableview which draws its content from the same store. If I let the thread sleep for a second, the startup time improves drastically. I would like to understand why the second thread is blocking/delaying the main thread. Is it because both are trying to access the store (The second thread has its own store coordinator and context) or another reason (e.g. dont spawn threads in didFinishLaunching)?

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• Unexpected key-value behavior in a Core Data Context

  - by ????

  If I create an array of strings (via key-value coding) containing the names of a Managed Object entity's attributes which are stored in the App Delegate the first time, I get an array of NSStrings without any problems. If I subsequently make the same call later from the same entry point in code, that same collection becomes an array of NULL objects- even though nothing in the Core Data Context has changed. One unappealing work-around involves re-creating the string array every time, but I'm wondering if anyone has a guess as to what's happening behind the scenes. // Return an array of strings with the names of attributes the Activity entity - (NSArray *)activityAttributeNames { #pragma mark ALWAYS REFRESH THE ENTITY NAMES? //if (activityAttributeNames == nil) { // Create an entity pointer for Activity NSEntityDescription *entity = [NSEntityDescription entityForName:@"Activity" inManagedObjectContext:managedObjectContext]; NSArray *entityAttributeArray = [[NSArray alloc] initWithArray:[[entity attributesByName] allValues]]; // Extract the names of the attributes with Key-Value Coding activityAttributeNames = [entityAttributeArray valueForKeyPath:@"name"]; [entityAttributeArray release]; //} return activityAttributeNames; }

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• Android Notification with AlarmManager, Broadcast and Service

  - by user2435829

  this is my code for menage a single notification: myActivity.java public class myActivity extends Activity { protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.mylayout); cal = Calendar.getInstance(); // it is set to 10.30 cal.set(Calendar.HOUR, 10); cal.set(Calendar.MINUTE, 30); cal.set(Calendar.SECOND, 0); long start = cal.getTimeInMillis(); if(cal.before(Calendar.getInstance())) { start += AlarmManager.INTERVAL_FIFTEEN_MINUTES; } Intent mainIntent = new Intent(this, myReceiver.class); pIntent = PendingIntent.getBroadcast(this, 0, mainIntent, PendingIntent.FLAG_UPDATE_CURRENT); AlarmManager myAlarm = (AlarmManager)getSystemService(ALARM_SERVICE); myAlarm.setRepeating(AlarmManager.RTC_WAKEUP, start, AlarmManager.INTERVAL_FIFTEEN_MINUTES, pIntent); } } myReceiver.java public class myReceiver extends BroadcastReceiver { @Override public void onReceive(Context c, Intent i) { Intent myService1 = new Intent(c, myAlarmService.class); c.startService(myService1); } } myAlarmService.java public class myAlarmService extends Service { @Override public IBinder onBind(Intent arg0) { return null; } @Override public void onCreate() { super.onCreate(); } @SuppressWarnings("deprecation") @Override public void onStart(Intent intent, int startId) { super.onStart(intent, startId); displayNotification(); } @Override public void onDestroy() { super.onDestroy(); } public void displayNotification() { Intent mainIntent = new Intent(this, myActivity.class); PendingIntent pIntent = PendingIntent.getActivity(this, 0, mainIntent, PendingIntent.FLAG_UPDATE_CURRENT); NotificationManager nm = (NotificationManager) this.getSystemService(Context.NOTIFICATION_SERVICE); Notification.Builder builder = new Notification.Builder(this); builder.setContentIntent(pIntent) .setAutoCancel(true) .setSmallIcon(R.drawable.ic_noti) .setTicker(getString(R.string.notifmsg)) .setContentTitle(getString(R.string.app_name)) .setContentText(getString(R.string.notifmsg)); nm.notify(0, builder.build()); } } AndroidManifest.xml <uses-permission android:name="android.permission.WAKE_LOCK" /> ... ... ... <service android:name=".myAlarmService" android:enabled="true" /> <receiver android:name=".myReceiver"/> IF the time has NOT past yet everything works perfectly. The notification appears when it must appear. BUT if the time HAS past (let's assume it is 10.31 AM) the notification fires every time... when I close and re-open the app, when I click on the notification... it has a really strange behavior. I can't figure out what's wrong in it. Can you help me please (and explain why, if you find a solution), thanks in advance :)

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• Generic XML parser in Silverlight 3.0

  - by Ummar

  Hi I am developing an application in Silverlight 3.0, I want to make a generic parser of XML in it, as on every call to webservice I am receiving a different XML, I want to make it generic so that I receive an XML in native datastructure of C#? Please help me out? like I am getting XML like this one time <test> <node1></node1> <node2></node2> </test> and other time <mytest> <application name="XYZ">My Application</application> <application name="ABC">My Application</application> </mytest> I want the generic parser, e.g. it makes some tree structure of whole XML

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• Finding a users maximum score and the associated details

  - by VolatileStorm

  I have a table in which users store scores and other information about said score (for example notes on score, or time taken etc). I want a mysql query that finds each users personal best score and it's associated notes and time etc. What I have tried to use is something like this: SELECT *, MAX(score) FROM table GROUP BY (user) The problem with this is that whilst you can extra the users personal best from that query [MAX(score)], the returned notes and times etc are not associated with the maximum score, but a different score (specifically the one contained in *). Is there a way I can write a query that selects what I want? Or will I have to do it manually in PhP?

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• Why does SQLAlchemy with psycopg2 use_native_unicode have poor performance?

  - by Bob Dover

  I'm having a difficult time figuring out why a simple SELECT query is taking such a long time with sqlalchemy using raw SQL (I'm getting 14600 rows/sec, but when running the same query through psycopg2 without sqlalchemy, I'm getting 38421 rows/sec). After some poking around, I realized that toggling sqlalchemy's use_native_unicode parameter in the create_engine call actually makes a huge difference. This query takes 0.5secs to retrieve 7300 rows: from sqlalchemy import create_engine engine = create_engine("postgresql+psycopg2://localhost...", use_native_unicode=True) r = engine.execute("SELECT * FROM logtable") fetched_results = r.fetchall() This query takes 0.19secs to retrieve the same 7300 rows: engine = create_engine("postgresql+psycopg2://localhost...", use_native_unicode=False) r = engine.execute("SELECT * FROM logtable") fetched_results = r.fetchall() The only difference between the 2 queries is use_native_unicode. But sqlalchemy's own docs state that it is better to keep use_native_unicode=True (http://docs.sqlalchemy.org/en/latest/dialects/postgresql.html). Does anyone know why use_native_unicode is making such a big performance difference? And what are the ramifications of turning off use_native_unicode?

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• Garbage Collection in Java

  - by simion

  On the slides I am revising from it says the following: Live objects can be identified either by maintaining a count of the number of references to each object, or by tracing chains of references from the roots. Reference counting is expensive – it needs action every time a reference changes and it doesn’t spot cyclical structures, but it can reclaim space incrementally. Tracing involves identifying live objects only when you need to reclaim space – moving the cost from general access to the time at which the GC runs, typically only when you are out of memory. I understand the principles of why reference counting is expensive but do not understand what "doesn’t spot cyclical structures, but it can reclaim space incrementally." means. Could anyone help me out a little bit please? Thanks

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• Need help optimizing MYSQL query with join

  - by makeee

  I'm doing a join between the "favorites" table (3 million rows) the "items" table (600k rows). The query is taking anywhere from .3 seconds to 2 seconds, and I'm hoping I can optimize it some. Favorites.faver_profile_id and Items.id are indexed. Instead of using the faver_profile_id index I created a new index on (faver_profile_id,id), which eliminated the filesort needed when sorting by id. Unfortunately this index doesn't help at all and I'll probably remove it (yay, 3 more hours of downtime to drop the index..) Any ideas on how I can optimize this query? In case it helps: Favorite.removed and Item.removed are "0" 98% of the time. Favorite.collection_id is NULL about 80% of the time. SELECT `Item`.`id`, `Item`.`source_image`, `Item`.`cached_image`, `Item`.`source_title`, `Item`.`source_url`, `Item`.`width`, `Item`.`height`, `Item`.`fave_count`, `Item`.`created` FROM `favorites` AS `Favorite` LEFT JOIN `items` AS `Item` ON (`Item`.`removed` = 0 AND `Favorite`.`notice_id` = `Item`.`id`) WHERE ((`faver_profile_id` = 1) AND (`collection_id` IS NULL) AND (`Favorite`.`removed` = 0) AND (`Item`.`removed` = '0')) ORDER BY `Favorite`.`id` desc LIMIT 50;

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• Cell Dequeue problem when table inside another table's cell content view

  - by Shailesh Kanzariya

  I am using two table views (Main Table and Sub Table), one table inside other's cell. I am adding Sub Table in Main Table's cell content view. I am also using different Cell Identifier for both table cells. Now, issue is : When - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath is called, very first time cell of Main Table is generated and when I scroll up/down they all are just dequeued, so it is expected and standard behavior and working fine. But, cell of Sub Table is getting created/allocated every time. It is not dequeued as it should be. I guess, its happening because Sub Table is part of Main Table's Cell Content view. But not sure and don't know how to resolve it. Can somebody help me to find the solution?

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• Problem with Wicket and SignInExample in IE8

  - by KJQ

  I have an interesting problem with Wicket. I'm basically duplicating the 'authentication' example from the v1.4.x in SVN. It works fine in FireFox and Chrome but not in IE8. When in IE8, after I click the submit button it returns with a 404 error but i can manually paste the "destination" url in and it goes there fine (as an authenticated user). Another scenario is, I try to login, it gives me a 404, I hit refresh (looking at the html source I see the page version incremented), relogin and it works fine. So to summarize: I login the first time in IE8 and it returns a 404 error, hit refresh and ogin again and it works fine. I login the first time in IE8 and it returns a 404 error, manually paste the destination url in the browser and it goes there fine as if im logged in. I've compared everything between IE8 and FireFox from the rendered source and the code is not doing anything special but I cannot figure out what the differences are? Thanks. KJQ

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• A two player game over the intranet..

  - by Santwana

  Hi everybody.. I am a student of 3rd year engineering and only a novice in my programming skills. I need some help with my project.. I wish to develop a two player game to be played over the network (Intranet). I want to develop a simple website with a few html pages for this.My ideas for the project run as follows: 1.People can log in from different systems and check who ever is online on the network currently. the page also shows who is playing with whom. 2.If a person is interested in playing with a player who is currently online, he sends a request of which the other player is somehow notified( using a message or an alert on his profile page..) 3.If the player accepts the request, a game is started. This is exactly where I am clueless.. How can I make them play the game? I need to develop a turn based game with two players, eg chessboard.. how can I do this? The game has to be played live.. and it is time tracked. i need your help with coding the above.. the other features i wish to include are: 4.The game could not be abruptly terminated by any one if the users.The request to terminate the game should be sent to the other player first and only if he accepts can the game be terminated. Whoever wins the game would get a plus 10 on their credit and if he terminated he gets a minus 10. The credits remains constant even if he loses but the success percentage is reduced. 6.The player with highest winning percentage is projected as the player of the week on the home page and he can post a challenge to all others.. I only have an intermediate knowledge of core java and know the basics of Swing and Awt. I am not at all familiar with networking in java right now. I have 5 to 6 weeks of time for developing the project but I hope to learn the things before I start my project. i would prefer to use a lan to illustrate the project and I know only java,jsp,oracle,html and bit of xml to develop my proj. Also I wish to know if I can code this within 6 weeks, would it be too difficult or complicated? Please spare some time to tell me. Please.. please.. I need your suggestions and help.. thank you so much..

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• How to parse a string to an integer without library functions?

  - by dack

  Hi, I was recently asked this question in an interview: "How could you parse a string of the form '12345' into its integer representation 12345 without using any library functions, and regardless of language?" I thought of two answers, but the interviewer said there was a third. Here are my two solutions: Solution 1: Keep a dictionary which maps '1' = 1, '2' = 2, etc. Then parse the string one character at a time, look up the character in your dictionary, and multiply by place value. Sum the results. Solution 2: Parse the string one character at a time and subtract '0' from each character. This will give you '1' - '0' = 0x1, '2' - '0' = 0x2, etc. Again, multiply by place value and sum the results. Can anyone think of what a third solution might be? Thanks.

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• Batch file writing to log then ending process

  - by Andrew Service

  I have a batch file that calls a process and in that process I have: IF %ERRORLEVEL% NEQ 0 EXIT /B %ERRORLEVEL% Now I wanted to upgrade this a bit and give some meaningful message to an output log when if the process fails, also I do not want the main batch to continue processing because the next processes are dependent on data from previous calls; I wonder if this would be correct but not sure: CALL Process 1 IF %ERRORLEVEL% NEQ 0 GOTO ErrorInfirstProcess /B %ERRORLEVEL% :ErrorInfirstProcess ECHO Process 1 Failed on %Date% at %Time%. >>C:\Log.txt" CALL Process 2 IF %ERRORLEVEL% NEQ 0 GOTO ErrorInSecondProcess /B %ERRORLEVEL% :ErrorInSecondProcess ECHO Process 2 Failed on %Date% at %Time%. >>C:\Log.txt" I also want to know if I still need the /B or do I need to put an EXIT command after the echo? Thanks A

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• Suppress checking for changes on file system in Eclipse RCP

  - by panschk

  Okay, I guess this question is too difficult, but it's worth a try. I have an eclipse RCP application that edits HTML-files. I deal with the content of the files only in a W3C-Dom representation. There is some stuff that I can not do with that, so I the program edits each file each time after it is saved (save, save as). Of course, the file is then out of synch with the file system, and the next time I touch it, eclipse complains: "The file has been changed on the file system. Do you want to replace the editor contents with these changes? (Yes/No)" I do not want to load the changes into the editor ("No") Maybe there is a way to tell Eclipse programmatically to not check that file for changes, or to configure it to not check for changes on any file? edit: Everything has to be done either programatically or by editing some XML files. I can not expect the user to do anything;-)

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• jquery animating different img widths

  - by romeozor

  Hi there, I've been searching for an answer for a long time with no avail, so it's time to ask. I'm trying to use .animate() to change the size of an image once clicked. The first state of the image would be a thumbnail size, which would animate to the image's original size, then to a thumbnail again. The problem is, not all the images have the same "original" size so I need a way to tell one generic function to switch to the current image's original size. This is my current code which loads on $(window).load: $('img[class=resize]').click(function (){ if ($(this).width() != 150) { $(this).animate({width: '150px'}, 400); } else { $(this).animate({width: ''}, 400); } }); Now this obviously doesn't work the way I want it, because .animate() thinks when I say width: '' I want to make the width = 0. Any suggestions how I should go about this?

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• WCF SERVICE gives us faulted response

  - by malik

  My service is hosted on IIS7, windows 2008 server with sql server2008 express. I am getting following error when the process takes more than 2 minutes i got this response, i m unable to find out either it is due to sql server time out or wcf time out. my sql server process is also took long. An error occurred while receiving the HTTP response to http://REMOTE/SynchronizationService_test/SyncService.svc. This could be due to the service endpoint binding not using the HTTP protocol. This could also be due to an HTTP request context being aborted by the server (possibly due to the service shutting down). See server logs for more details.

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• C#: multicolumn sorting of DataGridView

  - by Bi

  I have a DataGridView in a windows form with 3 columns: Serial number, Name, and Date-Time. The Name column will always have either of the two values: "name1" or "name2". I need to sort these columns such that the grid displays all the rows with name values in a specific order (first display all the "name1" rows and then all the "name2" rows). Within the "name1" rows, I want the rows to be sorted by the Date-Time. Please note programmatically, all the 3 columns are strings. For example, if I have the rows: 01 |Name1 | 2010-05-05 10:00 PM 02 |Name2 | 2010-05-02 08:00 AM 03 |Name2 | 2010-05-01 08:00 AM 04 |Name1 | 2010-05-01 11:00 AM 05 |Name1 | 2010-05-04 07:00 AM needs to be sorted as 04 |Name1 | 2010-05-01 11:00 AM 05 |Name1 | 2010-05-04 07:00 AM 01 |Name1 | 2010-05-05 10:00 PM 03 |Name2 | 2010-05-01 08:00 AM 02 |Name2 | 2010-05-02 08:00 AM I am not sure how to go about using the below: myGrid.Sort(.....,ListSortDirection.Ascending)

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• Where are the function literals c++?

  - by academicRobot

  First of all, maybe literals is not the right term for this concept, but its the closest I could think of (not literals in the sense of functions as first class citizens). The idea is that when you make a conventional function call, it compiles to something like this: callq <immediate address> But if you make a function call using a function pointer, it compiles to something like this: mov <memory location>,%rax callq *%rax Which is all well and good. However, what if I'm writing a template library that requires a callback of some sort with a specified argument list and the user of the library is expected to know what function they want to call at compile time? Then I would like to write my template to accept a function literal as a template parameter. So, similar to template <int int_literal> struct my_template {...};` I'd like to write template <func_literal_t func_literal> struct my_template {...}; and have calls to func_literal within my_template compile to callq <immediate address>. Is there a facility in C++ for this, or a work around to achieve the same effect? If not, why not (e.g. some cataclysmic side effects)? How about C++0x or another language? Solutions that are not portable are fine. Solutions that include the use of member function pointers would be ideal. I'm not particularly interested in being told "You are a <socially unacceptable term for a person of low IQ>, just use function pointers/functors." This is a curiosity based question, and it seems that it might be useful in some (albeit limited) applications. It seems like this should be possible since function names are just placeholders for a (relative) memory address, so why not allow more liberal use (e.g. aliasing) of this placeholder. p.s. I use function pointers and functions objects all the the time and they are great. But this post got me thinking about the don't pay for what you don't use principle in relation to function calls, and it seems like forcing the use of function pointers or similar facility when the function is known at compile time is a violation of this principle, though a small one.

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• How do I clear a WebView's content before loading a page?

  - by Mark

  I have an embedded WebView in my Cocoa application in which I load an external web page. Each time the user clicks on a button, the view opens and shows the page. The problem is that the second time the user opens the WebView, the previous page is still visible. Instead I'd like to show a blank/empty page (together with a progress indicator). How can I clear a WebView before loading a new page? The closest solution I could find was to call this: [webView stringByEvaluatingJavaScriptFromString:@"document.open();document.close()"]; Is there a better way to do this? Thanks!

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• In game programming are global variables bad?

  - by Joe.F

  I know my gut reaction to global variables is "badd!" but in the two game development courses I've taken at my college globals were used extensively, and now in the DirectX 9 game programming tutorial I am using (www.directxtutorial.com) I'm being told globals are okay in game programming ...? The site also recommends using only structs if you can when doing game programming to help keep things simple. I'm really confused on this issue, and all the research I've been trying to do is very confusing. I realize there are issues when using global variables (threading issues, they make code harder to maintain, the state of them is hard to track etc) but also there is a cost associated with not using globals, I'd have to pass a loooot of information around very often which can be confusing and I imagine time-costing, although I guess pointers would speed the process up (this is my first time writing a game in C++.) Anyway, I realize there is probably no "right" or "wrong" answer here since both ways work, but I want my code to be as proper as I can so any input would be good, thank you very much!

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• Using Remote Web Server to Initialize iPhone App

  - by Chris_K

  My iPhone app relies on a vendor's XML feed to provide data. But that feed is not locked down. The vendor could change the format of the XML at any time, although so far they've promised not to. Since I might want to tell my app to use a different URL for its data source, I'd like to set up a single "Command Central" Web page, on my own server, to direct the app to the correct data source. In other words, each time my app starts, in the background and unseen by the user, it would visit "http://www.myserver.com/iphoneapp_data_sources.xml" to retrieve the URL for retrieving data from my vendor. That way, if my vendor suddenly changes the exact URL or the XML feed that the app needs, I can update that Web page and ensure that all installations of the app are using the correct XML feed. Does anyone have any advice or examples showing this kind of approach? It seems as if this must be a common problem, but so far I haven't found a well-established design pattern that fits it.

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• Anonymous users support vs Google bot

  - by Andy

  I have a User class in my web app that represents a user currently logged in. Every time a user vists a page, a User instance is populated based on authentication data supplied in cookies. A User instance is created even if an anonymous user logs in - and a corresponding new record is created in the User table in the database. This approach allows me to save some state info for the current user regardless of its type. The problem however with this approach is the Google bot, and other non-human web organisms crawling my pages. Every time a bot starts to walk around the site, thousands of useless records will be created in the database, each of them only to be used for a single page. Question: what is the best trade off? How to support anonymous users, save their state, and don't get too much overhead because of cookieless bots?

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• In Node.js, how can I load my modules once and then use them throughout the app?

  - by TIMEX

  I want to create one global module file, and then have all my files require that global module file. Inside that file, I would load all the modules once and export a dictionary of loaded modules. How can I do that? I actually tried creating this file...and every time I require('global_modules'), all the modules kept reloading. It's O(n). I want the file to be something like this (but it doesn't work): //global_modules.js - only load these one time var modules = { account_controller: '/account/controller.js', account_middleware: '/account/middleware.js', products_controller: '/products/controller.js', ... } exports.modules = modules;

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