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• How can I implement "real time" messaging on Google AppEngine?

  - by Freed

  I'm creating a web application on Google AppEngine where I want the user to be notified a quickly as possible after certain events occour. The problem is similar to say a chat server in that I need something happening on one connection (someone is writing a message in a chat room) to propagate to a number of other connections (other people in that chat room gets the message). To get speedy updates from the server to the client I'm planning on using long polling with XmlHttpRequest, hoping that AppEngine won't interfere other than possibly restriing the timeout. The real problem however is efficient notification between connections on AppEngine. Is there any support for this type of cross connection notification on AppEngine that does not involve busy-waiting? The only tools I can think of to do this at all is either using the data storage (slow) or memcache (unreliable), and none of them would let me avoid busy-waiting. Note: I know about XMPP support on AppEngine. It's related, but I want a browser based solution, sending messages to the users by XMPP is not an option.

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• What Can A 'TreeDict' (Or Treemap) Be Used For In Practice?

  - by Seun Osewa

  I'm developing a 'TreeDict' class in Python. This is a basically a dict that allows you to retrieve its key-value pairs in sorted order, just like the Treemap collection class in Java. I've implemented some functionality based on the way unique indexes in relational databases can be used, e.g. functions to let you retrieve values corresponding to a range of keys, keys greater than, less than or equal to a particular value in sorted order, strings or tuples that have a specific prefix in sorted order, etc. Unfortunately, I can't think of any real life problem that will require a class like this. I suspect that the reason we don't have sorted dicts in Python is that in practice they aren't required often enough to be worth it, but I want to be proved wrong. Can you think of any specific applications of a 'TreeDict'? Any real life problem that would be best solved by this data structure? I just want to know for sure whether this is worth it.

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• [Seamless Handover of WiFi] Can we program to automatically join the WiFi with the most strongest si

  - by Dobby

  Hi all, I am making a iphone program, I wish that: it can sense and display the current signals of wifi, with strength, - as I checked, this cannot be done by official SDK, but there were some private library that can handle. 2. i wish it can always automatically join the best wifi with the most highest strength ( assume that all wifi APs have no password, and all are not remembered into the used-list inside iphone), which is something like "seamless handover"... I just guess that, there should be some APIs to let the system join one designated wifi signal from the list, and wish someone could help me. I would like to appreciate a lot : ) Thanks a lot!

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• Passing a web service an unknown number of parameters

  - by Billyhole

  I'm relatively new to utilizing web services. I'm trying to create one that will be accepting data from a ASP.Net form whose input controls are created dynamically at runtime and I don't how many control values will be getting passed. I'm thinking I'll be using jQuery's serialize() on the form to get the data, but what do I have the web service accept for a parameter? I thought maybe I could use serializeArray(), but still I don't know what type of variable to accept for the JavaScript array. Finally, I was thinking that I might need to create a simple data transfer object with the data before sending it along to the web service. I just didn't wanna go through with the DTO route if there was a much simpler way or an established best practice that I should follow. Thanks in advance for any direction you can provide and let me know I wasn't clear enough, or if you have any questions.

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• sql query need a help.

  - by benjamin button

  If i have a table with two fields.customer id and order. let's say i have in total order ID 1,2,3,4 all the customer can have all the four orders.like below 1234 1 1234 2 1234 3 1234 4 3245 3 3245 4 5436 2 5436 4 you can see above that 3245 customer doesnt have order id 1 and 2. how could i print in the query output like 3245 1 3245 2 5436 1 5436 3 EDIT: i dont order table but i have list of order's like we can hard code it in the query(1,2,3,4) i dont have an orders table.

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• the breakpoint will not currently be hit no symbols loaded

  - by Carlos_Liu

  I want to debug on the customer's machine (Windows Server 2003) to track a problem, and out product is based on .NET 2.0. I want to use DbgCLR.exe to debug a file AAA.dll, what I did is: install .NET 2.0 SDK on the customer's machine (to get the DbgCLR.exe) copy the symbol file AAA.pdb to the same directory with AAA.dll get the source file for AAA.dll the AAA.dll will be loaded by w3wp.exe, so in the DbgCLR Tools-Attach to Process, then I choose w3wp.exe File-Open-File open the source file and add a breakpoint in the function which will be callled but the breakpoint seems do no work because there is an warning icon on it and says : the breakpoint will not currently be hit. No symbols have been loaded for this document. On my computer (Windows XP) which has the debug version of whole source code, I did nearly the same thing as above but the different is: I attached aspnet_wp.exe to do the debug and it works What should I do to let it work on the customer's machine?

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• Convert Date with characters to mm/dd/yyyy

  - by peter

  I have a columns called Submit_Date in table Tickets and the datatype of it is Varchar(200) and I am trying to convert it to MM/DD/YYYY format and when i do that i get the following error: Msg 242, Level 16, State 3, Line 1 The conversion of a varchar data type to a datetime data type resulted in an out-of-range value. Sample Data of the table is: Submit_Date 27-09-2013 16:15:00 CST 30-09-2013 16:30:24 CST 27-09-2013 10:03:46 CST 30-09-2013 14:35:55 CST 25-09-2013 16:28:48 CST 24-09-2013 09:29:45 CST I tried doing the following: Select Convert(datetime,Submit_date,101) from dbo.Tickets Let me know where I am doing wrong.

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• Interview: Am I need to leave a hope for candidate?

  - by Budda

  Today I've interviewed a candidate who didn't answer any question. At all. After 3-4 answers (attempts to answer) for me was obvious: we won't hire him. Would you recommend me to say (definitely in polite form) something like: Sorry you don't meet our requirements? Or just to tell in another way: thank you, that are all my questions for now. Our HR department will let you know if/when we will need another interview session. Probably you see any other option. Thanks.

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• Would it be simply better to use the system's functions rather than use the language?

  - by Nullw0rm

  There are many scenarios where I've questioned PHP's performance with some of its functions, and whether I should build a complex class to handle specific things using its seemingly slow tools. For example, Complex regular expressions with sed and processing with awk would seemingly be exponential in performance rather than making PHP's regular expression and seemingly excessive functions parse and in time manage to finish it. If I were to do a lot of network tasks such as MX lookups/DIGging/retrieving simultaneously I would rather pass it via system() and let the OS handle it itself. There are simply too many functions in PHP, that are inefficient and result in slow pages or can be handled easier by the OS. What are your opinions? Do you think I should do the hard work with the OS in its own/custom functions?

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• Tool To Catch All The Inputs That Cause Crash?

  - by Barakat

  Hi all, I need a Windows tool records inputs and debugging informations that cause program's crashing. I don't mean a fuzzing tool ! Ammmmm ... let me show you a scenario may explain what I'm talking about. Sometimes during using a program, It's crashed without known reason ! and when I want to debug it, I will not find helpful informations to know how the crash happened. Because that the data that cause the crash no longer exist. So I need a tool records all the inputs and debugging informations to find helpful informations to reuse the inputs data to make the program crashes under a debaucher in order to understand how the crash happen.

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• Using AND/OR mysql commands with FROM_UNIXTIME

  - by scatteredbomb

  Trying to select a query in php/mysql to get "Upcoming Items" in a calendar. We store the dates in the DB as a unix time. Here's what my query looks like right now SELECT * FROM `calendar` WHERE (`eventDate` > '$yesterday') OR (FROM_UNIXTIME(eventDate, '%m') > '$current_month' AND `$yearly` = '1') ORDER BY `eventDate` LIMIT 4 This is giving me an error "Unknown column '' in 'where clause'". I'm sure it has to do with my use of parenthesis (which I've never used before in a query) and the FROM_UNIXTIME command. Can someone help me out and let me know how I've screwed this up? Thanks!

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• Screen orientation change forces data re-entry

  - by Timbermar

  I'm developing a simple app, only a handful of activities and nothing to complicated. The issue I'm having is that in a few of my activities I have EditText widgets, and when the screen is rotated, these widgets loose their values. They still visually, that is, on the handset screen, report their values from before the rotation, but to the code report their default values. An example, I have an activity with an EditText, I enter a number, 15, the calculator starts calculating, displays a result. If at this point I rotate to a different orientation, as expected the activity dies, reloads, shows the new orientation, my value of 15 is still in the EditText, however the calculator (the code) calculates as if it was 0, which is the initial value. I have not tried changing the initial value to see if it is really pulling from the default value, or just setting itself to 0 when I cast it as an int. If I didn't explain this well enough, let me know, I can add source code if I need to. Thanks.

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• Non US characters in section headers for a UITableView

  - by epatel

  I have added a section list for a simple Core Data iPhone app. I followed this so question to create it - How to use the first character as a section name but my list also contain items starting with characters outside A-Z, specially Å,Ä and Ö used here in Sweden. The problem now is that when the table view shows the section list the three last characters are drawn wrong. See image below It seems like my best option right now is to let those items be sorted under 'Z' if ([letter isEqual:@"Å"] || [letter isEqual:@"Ä"] || [letter isEqual:@"Ö"]) letter = @"Z"; Someone that have figured this one out? And while I'm at it... 'Å', 'Ä' and 'Ö' should be sorted in that order but are sorted as 'Ä', 'Å' and 'Ö' by Core Data NSSortDescriptor. I have tried to set set the selector to localizedCaseInsensitiveCompare: but that gives a out of order section name 'Ä. Objects must be sorted by section name' error. Seen that too?

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• Microsoft Access - Enter Parameter Value why?

  - by Jane Doe

  I am encountering a problem for my database. Here is the relationships of the database And tried to do the query for how many transactions have movie "Harry_Potter"? so I used SQL query: SELECT COUNT(td.movie) AS number_of_occurrence, td.transaction_number FROM TransactionDetails td, MovieDetails md WHERE md.movie = Harry_Potter But it asks for Harry_Potter enter parameter value why? The relevant SQL statements are CREATE TABLE TransactionDetails ( transaction_number INTEGER PRIMARY KEY, movie VARCHAR(30) NOT NULL, date_of_transaction DATE NOT NULL, member_number INTEGER NOT NULL ) CREATE TABLE MovieDetails ( movie VARCHAR(30) PRIMARY KEY, movie_type VARCHAR(3) NOT NULL, movie_genre VARCHAR(10) NOT NULL ) ALTER TABLE TransactionDetails ADD CONSTRAINT member_number_fk FOREIGN KEY (member_number) REFERENCES LimelightMemberDetails(member_number); ALTER TABLE TransactionDetails ADD CONSTRAINT transaction_number_drink_fk FOREIGN KEY (transaction_number) REFERENCES DrinkTransactionDetails(transaction_number); ALTER TABLE TransactionDetails ADD CONSTRAINT transaction_number_food_fk FOREIGN KEY (transaction_number) REFERENCES FoodTransactionDetails(transaction_number); ALTER TABLE TransactionDetails ADD CONSTRAINT movie_fk FOREIGN KEY (movie) REFERENCES MovieDetails (movie); Thank you for your help! If there is anything wrong with my database design please let me know! thank you!

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• How do I add a new ItemTemplate to a Guidance Automation Toolkit vs2010 .vsix package?

  - by Maslow

  I have a vs2008 GAT package that has been updated to work on vs2010 which walks a developer through creating a custom solution complete with a Service layer project, Domain, usercontrol, and unit test project. I'd like to add a new ItemTemplate to the package to create a user control or dialog that adheres to our current practices. So far it seems I need a Recipe, but I can not find any reference for the GuidancePackage.xml file and how to properly add things to it, let alone how to add a new Item Template or guidance steps and decisions. How can I add an item template to my add-in?

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• Live asynchronous time feed for websites

  - by Maven

  I want to show up the time over my website based over the location of the user, let’s say if user one browsing the website is from USA than the time should be what is in USA currently and same for China etc. and all. I was wondering if there exists a JavaScript plugin for it but I didn’t find any as dynamic as I want, my requirements include: Something that can be fully stylized according to website theme (no iframes) The pattern I want is to be in (HH:MM:SS) It should be asynchronous like the second [SS] keep ticking and the time keep updating Is this possible, a way around to achieve it?

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• Hide twitter bootstrap popover

  - by soft genic

  Following is my jquery code which i am using to display popover . What i wanna do is when a user click anywhere on the screen or on any <span id="close" class="pover"></span> then it hides the current opened popover and show a new popover on which the user clicks on. As You can see below span which contains class="pover" are being poped up by the following jquery kindly let me know how can i hide the opened popup and display a new one accordingly Currently, all the popover are getting displayed on click event. $(document).ready(function() { $('.pover').each(function() { //$('#close').popover( "hide" ); $(this).popover({ title: $(this).attr('abc'), content: $(this).attr('data-content'), delay: "show", trigger: "click" }); }); });

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• Large Video Uploads via a website

  - by Andrew

  Some of the problems that can happen are timeouts, disconnections, and not being able to resume a file and having to start from the beginning. Assuming these files are up to around 5gigs in size, what is the best solution for dealing with this problem? I'm using a Drupal 6 install for the website. Some of my constraints due to the server setup I have to deal with: Shared hosting with max 200 connections at a time (unlimited disk space) Shared hosting. Unable to create users through an API (so can't automatically generate ftp accounts) I do have the ability to run cron-type scripts via a Drupal module. My initial thought was to create ftp users based off of Drupal accounts and requiring them to download an ftp client for their OS of choice. But the lack of API to auto-create ftp accounts and the inability to do it from command line kind of hinder that solution. If there's a workaround someone can think of, let me know! Thanks

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• Determining the number of objects in an NSArray

  - by Viral

  Hi friends, I am making a book application. To move to the next topic I am using a button. The Button works as it moves to the next topic, but at the end of the file my application gets the message obj_fatal and it crashes. If I knew how many objects there are in my NSArray then the problem will be solved. I am getting the details from a .plist file and storing it in to a array. So if any one knows how, please let me know. Thanks in advance. Viral.

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• Is there a way to show a 3-D surface plot in the browser?

  - by Phage

  I've got a bunch of data for 3-D surface plots. I want to build a quick web interface to let me browse through that data. Are there any (free) packages out there that can easily show surface plots? I found this question but the suggested libraries did not support surface plots. If it requires a plugin like flash / java that is fine. This is for prototyping so a quick 'n dirty solution is preferred. Right now, the only option I have come up with is to use gnuplot to serve up static images. It would be awesome if there was some way to provide an interactive 3-D surface plot in the browser.

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• Model of hql query firing at back end by hql engine?

  - by Maddy.Shik

  I want to understand how hibernate execute hql query internally or in other models how hql query engine works. Please suggest some good links for same? One of reason for reading is following problem. Class Branch { //lazy loaded @joincolumn(name="company_id") Company company; } Since company is heavy object so it is lazy loaded. now i have hql query "from Branch as branch where branch.Company.id=:companyId" my concern is that if for firing above query, hql engine has to retrieve company object then its a performance hit and i would prefer to add one more property in Branch class i.e. companyId. So in this case hql query would be "from Branch as branch where branch.companyId=:companyId" If hql engine first generate sql from hql followed by firing of sql query itself, then there should be no performance issue. Please let me know if problem is not understandable.

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• Accessing global variables within functions in PHP

  - by st3

  There are multiple times in one page where I need to connect and subsequently query a MySQL database, yet my code won't let me. I think it might be something to do with how my files are nested but it makes no sense. I am opening the SQL connection in the header file. The top of the offending page looks like the following: <?php $page_title = 'Dashboard'; include('templates/header.inc'); // includes a 'require_once('mysqli_connect.php') and a small query to the database; require_once('includes/functions.php'); require_once('includes/dashboard_sql.php'); // Contains functions which connect to database (which are failing.) ?> I get the PHP error Notice: Undefined variable: dbc in /Library/WebServer/Documents/pediatory_site/includes/dashboard_sql.php Where $dbc is the database connection defined in mysqli_connect.php. If anyone could help me out that would be great.

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• Qlikview joins that dosen't join on all matching column names

  - by Dev_Karl

  Hi! I'm new to Qlikview and looking for some answers regarding scripting. How can I create Qlickview joins that just join on a specific column (and not all that are having a matching name)? Let's say that I'm having the following tables: Employee Id | Person | DepartmentID | Flags 1000 , Bob , 2001 , 1000000 1001 , Sue , 2002 , 1100000 Department Id | Name | Flags 2001 , HR , 01101111 2001 , R&D , 1100000 What is the best way of joining those tables on the DepartmentID <- ID field? The data is provided by SQL selects. I'm thinking of writing SQL views using unique names would be one idea, but there must be a simpler way. Please advice Kind regards, Karl

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• Is it a good idea to use only a key to encrypt an entire (small) filesystem?

  - by Fernando Miguélez

  This question comes as part of my doubts presented on a broader question about ideas implementing a small encrypted filesystem on Java Mobile phones (J2ME, BlackBerry, Android). Provided the litte feedback received, considering the density of the question, I decided to divide those doubts into small questions. So to sum up I plan to "create" an encrypted filesystem for for mobile phones (with the help of BoucyCastle or a subset of JCE), providing an API that let access to them in a transparent way. Encryption would be carried out on a file basis (not blocks). My question is this: Is it a good idea to use only a simmetric key (maybe AES-256) to encrypt all the files (they wouldn't be that many, maybe tens of them) and store this key in a keystore (protected by a pin) or would you rather encrypt each file with an on-the-fly generated key stored alongside each file, encrypting that key with the "master" key stored on the keystore? What are the benefits/drawbacks of each approach?

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• Would this constructor be acceptable practice?

  - by Robb

  Let's assume I have a c++ class that have properly implemented a copy constructor and an overloaded = operator. By properly implemented I mean they are working and perform a deep copy: Class1::Class1(const Class1 &class1) { // Perform copy } Class1& Class1::operator=(const Class1 *class1) { // perform copy return *this; } Now lets say I have this constructor as well: Class1::Class1(Class1 *class1) { *this = *class1; } My question is would the above constructor be acceptable practice? This is code that i've inherited and maintaining.

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