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• WPF ItemsControl - how to know when the items finished loading, so that I can focus the first one?

  - by Tomáš Kafka

  Hi everyone, I have an ItemsControl in my View, that is bound to an ObservableCollection from ViewModel. The collection is filled, and afterwards an event from VM to view is raised (think search results and SearchFinished event). I would like to move keyboard focus to the first item in an ItemsControl, but when I do it in View's code-behind when handling SearchFinished, the items are not yet rendered (the collection is filled already, but wpf's rendering is asynchronous and didn't happen yet), so there is nothing to focus (Focus() needs to have the items' visual tree already constructed). I wanted to do (myItemsControl.ItemContainerGenerator.ContainerFromIndex(0) as UIElement).Focus();, but as the 0th item is not yet loaded, ContainerFromIndex(0) returns null. I tried delaying it with Dispatcher.BeginInvoke... with low priority, but that is dependent on exact timing and usually doesn't work. How can I wait until the first item in ItemsControl is Loaded?

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• How does operating system software maintains time clocks?

  - by Neeraj

  Hi everyone, This may sound a bit less relevant but I couldn't think of a better place to ask this question. Now consider this situation, you install an OS on your system, set the timezone and time, do some stuff and turn it off. (Note that there is no power going in to the computer). Now next time (say after some hours or days) you turn it on again, and you see the updated time. How is this possible even when my computer is not connected to the internet and was consuming no power during the period it was down.(Is there some kind of hardware hack?) please clarify!

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• Using mozilla plataform to develop desktop applications

  - by RHaguiuda

  Hi everyone. From what It seems mozilla plataform was designed to be used focused in web development (browsers, e-mail clients, instant message...). I want to use Mozilla plataform to develop desktop applications that need most access to computer serial port and some applications that have nothing to do with web. Im considering mozilla because its multi-plataform and easy to extend using themes and extensions. Is it possible to program a serial terminal for example using mozilla? Does mozilla have any class ou framework that do this job or I`ll have to code for windows API? Thank you!

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• Modify strings in Rails?

  - by Daniel O'Connor

  Hey everyone, So I'm new to Rails (teaching myself as a senior project in high school), and I'm trying to figure out how to modify these strings. Let's say someone writes the following string in a form: "you know you are a geek when" How can I automatically change it to this: "You know you are a geek when..."? I need Rails to check the case of the first letter and check for the three dots then modify the string as necessary. I've looked here, but I can't find anything that would work. Thanks a lot!

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• Restfull authentication between two GAE apps.

  - by user259349

  Hello everyone, i am trying to write a restful google app engine application (python) that accepts requests only from another GAE that i wrote. I dont like any of the ways that i thought of to get this done, please advice if you know of something better than: Get SSL setup, and simply add the credentials on the request that my consuming app will send. I dont like it cause SSL will slow things down. Security by obsecurity. Pass a long number by my consuming app that is in Xmod0, where X is a secret number that both applications know. I just,,,, dont like this. Check the HTTP header to see where is the request coming from. This option is the one that i hate the least, not alot of processing, and spoofing an HTTP request is not really worth it, for my application's data. Is there any other clean solution for this?

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• Best way to implement keywords for image upload gallery

  - by Dan Berlyoung

  I'm starting to spec out an image gallery type system similar to Facebook's. Members of the site will be able to create image galleries and upload images for others to view. Images will have keywords the the uploader can specify. Here's the question, what's the best way to model this? With image and keyword tables linked vi a HABTM relation? Or a single image table with the keywords saved as comma delimited values in a text field in the image record? Then search them using a LIKE or FULL TEXT index function? I want to be able to pull up all images containing a given keyword as well as generate a keyword cloud. I'm leaning toward the HABTM setup but I wanted to see what everyone else though. Thanks!!

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• Keeping a database structure up to date in a project where code is on subversion?

  - by Bruno De Barros

  I have been working with Subversion for a while now, and it's been incredible for the management of my projects, and even to help managing the deployment to several different servers, but there is just the one thing that still annoys me. Whenever I make any changes to the database structure, I need to update every server manually, I have to keep track of any changes I made, and because some of my servers run branches of the project (modifications that are still being worked on, or were made for different purposes), it's a bit awkward. Until now, I've been using a "database.sql" file, which is a dump of the database structure for a specific revision. But it just seems like such a bad way to manage this. And I was wondering, how does everyone else manage their MySQL databases when they're working on a project and using Subversion?

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• python Illegal instruction on AIX5.2

  - by Charlie Epps

  hi,everyone: I run my python script functions like this: read from a text file, and store the data as dict. But when in the loop, an Illegal instruction occurs. why this happens? the psu-code is : d={} datafile=open('a.txt') # a big text file for line in datafile: line=line.rstrip('\n') for token in line.split(): print("Parsing line %d." % token[0]) d[(int(token[0]))]=token[1:] then the message is like this: Parsing line 1. Parsing line 2. ............ Parsing line 1065 Illegal instruction what's the problem? my platform is python 2.6.2 on AIX 5.2. please help me, thanks!

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• Automated testing of a website for IE7 javascript errors?

  - by Andreas Bonini

  This week I decided to add a new element to a javascript array by copying a similar one from a previous line; unfortunately I forgot to remove the comma so the end result was something like var a = [1, 2, 3,]. The code went live late Friday afternoon just before everyone left for the week-end, and it completely broke everything in Internet Explorer 7 (and lower I assume) since it's such a great browser. Since there was no one to read emails (week-end) it went unnoticed for quite a while, and I really don't want something like this to happen again (especially in my code).. This is not the first of weird IE7 problems; I was wondering if there was a way to automatically test key pages looking for javascript or css errors, or really anything that IE8 would output in its new console in development tools. If there isn't, what do you usually do? You test the website after every change with all the browsers you support? (Something I'll do from now, at least for IE, if there is no way to run automated tests)

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• Scala match question

  - by javier

  Hello to everyone. I came across with an error on my Scala code that I cannot solve by myself (I am new at Scala). I have the following code: def myFunction(list: List[Any]): String = { var strItems : String = ""; list.foreach(item => { strItems += item match { case x:JsonSerializable => x.toJson() case y:String => ("\"" + y + "\"") case _ => item.toString } if(item != list.last) strItems += ","; }) strItems; } The error I am getting is: error: pattern type is incompatible with expected type; found : String required: Unit case y:String = ("\"" + y + "\"") Any idea why? PS: is there a more performant way to code myFunction

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• Pageview implementation

  - by The Elite Gentleman

  Hi everyone I want to add a pageview feature on my current web application. This page view is based on the count of user viewing the page. It must be unique, i.e. I must not view a person's page 10000 times and record it as 10000 views, just record 1 view instead. My question is, should I base my pageview count on IP address? If not, what is/are the best approach in doing this? I know that if the person has logged in to my system, I can simply use the user id stored in the session and check on the record if the user has/hasn't viewed the page and update accordingly. But for "anonymous" viewers, what is the best approach? Thanks. PS How does Youtube does it?

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• zend framework can't find Model classes ?

  - by user284503

  Yall: I have a simple question, it might be a simple configuration issue, but I have a Model defined, and when I try to access it from a controller it fails. The Model is in the model directory, and when I look at the quickstart app, it seems like this should work. Here is my model: <?php class Application_Model_User { protected $_user; protected $_password; protected $_userId; // very simple right } ?> My controller just stops.. here is the controller code: <?php class UserController extends Zend_Controller_Action { public function init() { } public function indexAction() { // display login form $users = new Application_Model_User(); echo "test never echos.. stopped above ? weird huh.."; // fails before .. } ?> Thank you everyone,

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• Digital signature integration with software written in java

  - by Serkan Kasapbasi

  hi everyone, i'm extremely rookie on this security field, so please forgive if my questions are dumb. i am asked to convert and migrate couple "Lotus Forms" forms to our software that is written in java. One thing in forms that bother me is digital signatures. These forms can be signed by digital signatures, probably generated by "Silanis Approve-it". as i have said before, i dont have much knowledge about this technology. and strangely couldnt find any tutorial or example of integrating digital signature and java. So what are the possibilities here ? how my code read a digital signature, sign a document with this signature? There should be an API or something that is provided by vendors right :)

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• UITableView don't react on a tap

  - by aspcartman

  I have a fully working grouped tableview. But when i just tap on a cell - nothing happens. willSelectRowAtIndexPath is not even being called. All outlets are set correctly, userInteractions are enabled, tableView is the only view on a page. Googling for hours made no success. Everyone has a selection feature from the begining and someone even tries to ged rid of it. Help, please. Cell creation: UITableViewCell *cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:@"FriendCell"];

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• Put stored procedure result set into a table-- any shortcuts besides INSERT INTO...EXEC?

  - by larryq

  Hi everyone, I'm creating a temp table that's the result of a stored procedure's result set. Right now I'm using the create table statement, followed by insert into....exec. It gets the job done but I was curious if there are other ways of going about this? I wish it were possible to run a select into, with the stored procedure's result set serving the role of the select statement, so that I wouldn't have to write a create statement beforehand (so that if the stored proc's columns change, there wouldn't be any modifications needed.) If there are other ways to go about this that might fit my needs better I'd love to hear about them. Thanks very much.

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• Is it possible to call a procedure within an SQL statement?

  - by darren

  Hi everyone I thought I would use a stored routine to clean up some of my more complex SQL statements. From what I've read, it seems impossible to use a stored procedure within an sql statement, and a stored function only returns a single value when what I need is a result set. I am using mySQL v5.0 SELECT p.`id`, gi.`id` FROM `sport`.`players` AS p JOIN `sport`.`gameinstances` AS gi ON p.`id` = gi.`playerid` WHERE (p.`playerid` IN (CALL findPlayers`("Canada", "2002"))) AND (gi.`instanceid` NOT IN (CALL findGameInstances`("Canada", "2002"))); For example, the procedures 'findPlayers' and 'findGameInstances' are are stored routines that execute some SQL and return a result set. I would prefer not to include their code directly within the statement above.

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• PHP photo gallery with multiple upload form

  - by NightMICU

  Hi everyone, I am trying to develop a PHP driven gallery with a form that has at least four file upload boxes, each with its own title and caption. I have been using php.upload.class to process uploaded photos but not sure how I would go about handling each individual upload while preserving its details (title, caption). Is there a practical way to do this or should I instead upload just the photos and then have the user add titles and captions on the next page? Any help/suggestion would be greatly appreciated. Thanks!

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• Magento Installation stuck at configuration

  - by itsandy

  Hi Everyone, I am not sure what is going wrong when I am trying to install magento to my local ubuntu machine. I did all the steps mentionsed in the magento wiki. Everything goes well until I reach the point where I am here which is the magento config page. When I try and continue after entering the necessary details like host, database name and user name and submit it comes back to the same page. I checked for everything like db in my phomyadmin panel and it still gets stuck there. What is the possible reason for that. Thanks

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• Using java to send/receive different objects through UDP

  - by AAA

  Hello everyone, I am writing a program in Java where there are communications between two or more machines using UDP. My application sends objects after serializing them through the network to the other machine where it will be deserialized and dealt with it. I was successful in sending one kind of objects so far. My problem is that I want the sender to be able to send different kind of objects, and for the receiver to be able to receive them and cast them again to their appropriate types. However, since UDP allocates a byte buffer then receive the data into the buffer, it is impossible to cast or detect the type of the received object as different objects have different sizes. Is there is a way that I can use to send different kind of objects using UDP and then receive them at the other end? (I don't ask for code here, just some ideas) Thanks

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• Simple NLP: How to use ngram to do word similarity?

  - by sadawd

  Dear Everyone, I Hear that google uses up to 7-grams for their own data. I am interested in finding words that are similar in context (i.e. cat and dog) and I was wondering how do I compute the similarity of two words on a n-gram model given that n 2. Given a sample set like this forexample: (I, love cats), (cats, loves, dogs), (dogs, hate, human) What is a good way to compare the similarity of this pair (I, cats)? Also does anyone know of anyway to do levels for NLP? like: Army-Military-Solider ?

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• How Long: Converting HTML to Jooma pages

  - by George

  Hello Everyone, I would really appreciate your help with finding out how long it takes a 1-3 year experenced programmer to convert a few HTML pages into joomla 1.5 dynamic pages. I know that some of it depends on how complex the pages are but i'm talking about average pages. That's my first question, my other question is how long will it take a 1-3 year experenced programmer to install all of these componants: Video module, photo gallery module, vertuemart shopping cart. I pay programmers to do this work but i have to make as sure as i can that i'm not over paying them. Thanks in advance for answering these two questions...George

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• Lambda Expressions and Stored Procedures

  - by Jason Summers

  Hi Everyone. I'm trying to mimic the LINQ Where extension method for my ADO.NET DAL methods. Bascially, my aim is to have a single method that I can call. Such as: Product p = Dal.GetProduct(x => x.ProductId == 32); Product p2 = Dal.GetProduct(x => x.ProductName.Contains("Soap")); I then want to dissect those Predicates and send the filter options to parameters in an ADO.NET Stored Procedure call. Any comments greatly appreciated.

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• openss7 ss7 I_LINK ioctl

  - by deddihp

  Hello everyone, is there anyonve have used openss7 before ?. well, I am trying to implement MTP with mtpi interface. so i use I_LINK to link between M2PA and MTP. But I got some error, ioctl invalid argument. Do you have some suggestion for me ?. Thanks. your answer will be very helpful for me. int a1 = open("/dev/sctp_n", O_RDWR); int a2 = open("/dev/mtp", O_RDWR); ioctl(a1, I_PUSH, "m2pa-sl"); perror("m2pa-sl"); int a3 = ioctl(a1, I_LINK, a2); perror("ilink");

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• How to use MOV instruction in ARM with an immediate number as the second operand

  - by Summer_More_More_Tea

  Hi everyone: I just begin to study ARM assembly language, and am not clear about how to use MOV to transfer an immediate number into a register. From both the ARM reference manual and my textbook, it's said that range of immediate number following MOV instruction is 0-255. But when I test on my own PC in ADS 1.2 IDE, instruction MOV R2, #0xFFFFFFFF performs well. Isn't number 0xFFFFFFFF out of range according to the specification? Hope someone can give me a hand. Regards.

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• Path element of Siverlight issue

  - by George2

  Hello everyone, Suppose I have the following XAML code, my confusions are, (1) I do not know the exact meaning of Data attribute, especially items starts with letter M/C, (2) there is no special configuration for TransformGroup (all using default settings), why put the TransformGroup here? <Path Height="2.75" Width="2.75" Data="M2.75,1.375 C2.75,2.1343915 2.1343915,2.75 1.375,2.75 C0.61560845,2.75 0,2.1343915 0,1.375 C0,0.61560845 0.61560845,0 1.375,0 C2.1343915,0 2.75,0.61560845 2.75,1.375 z" Fill="#FF9F9B9B" Stretch="Fill" Stroke="#FF000000" StrokeThickness="0" Canvas.Top="7" x:Name="p3"> <Path.RenderTransform> <TransformGroup> <ScaleTransform/> <SkewTransform/> <RotateTransform/> <TranslateTransform/> </TransformGroup> </Path.RenderTransform> </Path> thanks in advance, George

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