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• How to play multiple online videos on IOS continuously

  - by Matt.Z

  The scenario is like this: I have some long video, and slice it into small files(mp4, for example: 5 min per file), put them under some website. I wanna play (on IOS) these mp4 videos continuously, one by one, try to do not let user feel there has a pause between video pieces. So I need to buffer next video when I play current one. But I don't know where to start. What should I do? Can anyone give me some information of related documentation or source code I can study with?

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• XNA or C# Pop-up progress bar for the LoadContent() method

  - by Warlax

  Hey people, We wrote a small game using Microsoft's XNA Game Studio 3.1. The LoadContent() takes a long time because, other than loading models, and config files, we're also running some one-time (per run) terrain analysis. We are not C# or XNA programmers... we're Java programmers, and want to be able to give the user some feedback that the system is loading. Preferably, this will be through a simple pop-up with a progress bar that will say something simple like "loading please wait". The progress bar doesn't have to be a 0 to 1 progress bar, it can instead be one of those 'back and forth' progress bars. I was hoping for some quick copy-paste ready code to just do that - as it is not a central piece of our project, nor do we have a need to delve into too much documentation. I appreciate you time, effort, and possible donation. Thanks.

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• Does the `Expires` HTTP header needs to be consistent across multiple cold-cache requests?

  - by chakrit

  I'm implementing a custom web server of a kind. And am looking into adding an Expires header support. However, I'm a little unsure of how exactly to implement it. If multiple cold-cache requests are being made to the same unchanged resource on the server and the server returned different Expires header (say it uses relative time to calculate the exact value of the Expires date e.g. +6 hours from the request time), does that invalidate the cache on all the proxy servers in-between as well? Or is it impossible to happen (per the spec)? Does the Expires HTTP header needs to be consistent across multiple cold-cache requests?

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• Group MySQL Data into Arbitrarily Sized Time Buckets

  - by Eric J.

  How do I count the number of records in a MySQL table based on a timestamp column per unit of time where the unit of time is arbitrary? Specifically, I want to count how many record's timestamps fell into 15 minute buckets during a given interval. I understand how to do this in buckets of 1 second, 1 minute, 1 hour, 1 day etc. using MySQL date functions, e.g. SELECT YEAR(datefield) Y, MONTH(datefield) M, DAY(datefield) D, COUNT(*) Cnt FROM mytable GROUP BY YEAR(datefield), MONTH(datefield), DAY(datefield) but how can I group by 15 minute buckets?

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• Sales figures not displayed in form

  - by Brian Wilson

  Trying to calculate total sales for 5 items, 3 stores. Here's a s/s of what Im getting, along with my code. What am I missing/doing wrong? (p.s. It's not returning an error code in 'debug') Public Class Form1 Private Sub btnCalc_Click(sender As Object, e As EventArgs) Handles btnCalc.Click Dim ttlsales As Double 'set up array data Dim sales(,) As Integer = {{25, 64, 23, 45, 14}, {12, 82, 19, 34, 63}, {54, 22, 17, 43, 35}} Dim price() As Double = {12.0, 17.95, 95.0, 86.5, 78.0} 'mark totals Dim totals(2) As Double For store As Integer = 0 To 2 For item As Integer = 0 To 4 Next Next 'display output lstOut.Items.Add("Sales Per Store") For store As Integer = 0 To 2 lstOut.Items.Add(store + 1 & ":" & FormatCurrency(totals(store))) ttlsales += totals(store) Next lstOut.Items.Add("Total Sales: " & FormatCurrency(ttlsales)) End Sub End Class

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• View of nodes and their translations

  - by kratib

  I'm trying to create a view of nodes and their translations. Specifically, I want each row to show the node title for each language. The way I'm doing it right now is by filtering the view by a specific language, then adding one relationship of type "Node translation: Translations" for each language on the site. I can then choose the "Node: Title" field, once for the original language and once per relationship. The problem with this approach is that the nodes that don't exist in the filtered language, but exist in other languages, are not included in the view. That's what I need help with.

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• Any way to have delayed_job execute some run-once code at startup and use across all jobs?

  - by Rob Cameron

  So I've got a delayed_job task that pushes some info to an XMPP server. Ideally you create a connection to XMPP once and then constantly push data to it, rather than creating a new connection every time you have some data to send. Is there any kind of facility in delayed_job for running a sort of 'setup' method when a worker starts, have it set some instance variables (like the XMPP connection object) that can then be used by all the jobs that come up? It's okay if each worker runs its own setup method. I just don't want every job (thousands per day) connecting to the XMPP server from scratch every time. Thanks for any help!

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• Which features do html form elements miss

  - by Bakhtiyor

  I just wondered and wanted to gather together in one place all missing features of our beloved html form elements. One example could be missing of horizontal scrollbar in a listbox. But I am sure there are a lot of features we would like to see in our form elements by default. I order to be clear let's only take into account HTML4, because with HTML5 there are a lot of things haven't been finished yet. One missing feature per answer please. Thank you.

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• python decorator to add function to list in current scope

  - by AlexH

  Goal: Make a decorator which can modify the scope that it is used in. If it worked: class Blah(): # or perhaps class Blah(ParentClassWhichMakesThisPossible) def one(self): pass @decorated def two(self): pass Blah.decorated ["two"] Why? I essentially want to write classes which can maintain specific dictionaries of methods, so that I can retrieve lists of available methods of different types on a per class basis. errr..... I want to do this: class RuleClass(ParentClass): @rule def blah(self): pass @rule def kapow(self): pass def shazam(self): class OtherRuleClass(ParentClass): @rule def foo(self): pass def bar(self): pass RuleClass.rules.keys() ["blah", "kapow"] OtherRuleClass.rules.keys() ["foo"]

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• J2EE: Default values for custom tag attributes

  - by Nick

  So according to Sun's J2EE documentation (http://docs.sun.com/app/docs/doc/819-3669/bnani?l=en&a=view), "If a tag attribute is not required, a tag handler should provide a default value." My question is how in the hell do I define a default value as per the documentation's description. Here's the code: <%@ attribute name="visible" required="false" type="java.lang.Boolean" %> <c:if test="${visible}"> My Tag Contents Here </c:if> Obviously, this tag won't compile because it's lacking the tag directive and the core library import. My point is that I want the "visible" property to default to TRUE. The "tag attribute is not required," so the "tag handler should provide a default value." I want to provide a default value, so what am I missing? Any help is greatly appreciated.

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• Remove empty subfolders with PHP

  - by Dmitry Letano

  I am working on a PHP function that will recursively remove all sub-folders that contain no files starting from a given absolute path. Here is the code developed so far: function RemoveEmptySubFolders($starting_from_path) { // Returns true if the folder contains no files function IsEmptyFolder($folder) { return (count(array_diff(glob($folder.DIRECTORY_SEPARATOR."*"), Array(".", ".."))) == 0); } // Cycles thorugh the subfolders of $from_path and // returns true if at least one empty folder has been removed function DoRemoveEmptyFolders($from_path) { if(IsEmptyFolder($from_path)) { rmdir($from_path); return true; } else { $Dirs = glob($from_path.DIRECTORY_SEPARATOR."*", GLOB_ONLYDIR); $ret = false; foreach($Dirs as $path) { $res = DoRemoveEmptyFolders($path); $ret = $ret ? $ret : $res; } return $ret; } } while (DoRemoveEmptyFolders($starting_from_path)) {} } As per my tests this function works, though I would be very delighted to see any ideas for better performing code.

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• What is the most useful R trick?

  - by Dirk Eddelbuettel

  In order to share some more tips and tricks for R, what is you single-most useful feature or trick? Clever vectorization? Data input/output? Visualization and graphics? Statistical analysis? Special functions? The interactive environment itself? One item per post, and we will see if we get a winner by means of votes. [Edit 25-Aug 2008]: So after one week, it seems that the simple str() won the poll. As I like to recommend that one myself, it is an easy answer to accept.

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• JSP 2.0 SEO friendly links encoding

  - by victor hugo

  Currently I have something like this in my JSP <c:url value="/teams/${contact.id}/${contact.name}" /> The important part of my URL is the ID, I just put the name on it for SEO purposes (just like stackoverflow.com does). I was just wondering if there is a quick and clean way to encode the name (change spaces per +, latin chars removal, etc). I'd like it to be like this: <c:url value="/teams/${contact.id}/${supercool(contact.name)}" /> Is there a function like that out there or should I make my own?

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• File location for config file to app installed to local user location

  - by user54064

  I have a WinForm app that has inside of the app's config file locations to find files for the app to use as it runs. However, the app will be installed locally for each user so it can't be hard coded. For Vista and Windows 7 the installer puts the app in c:\users\\Documents area. Under Windows XP it puts it in a different location. How can I write the config file to use some sort of placeholder to be filled in at runtime with the specific user's information? I am just using the default areas that Windows wants to install a per-user install but need the config file to be flexible at runtime for the specific user.

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• SQL Server adding a record record manually to a view

  - by SelectDistinct

  I have a view which contains the data seen in the image below. The view is showing me how many working days are available in each month for the current financial year taking away any school/bank holidays. As the month of August has zero days available it has excluded this month from the view. As the total number of days available will always be zero for the month of August, then it seems acceptable to hardcode the SQL to always have 0 for August, and also an April-August record which will be the same as April-July. What would be the best way to add these 2 records, and where about in the code should it be placed see example of code layout: see link (answered question) for layout of code: SQL populate total working days per month minus bank holidays for current financial year

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• Posting Static & Variable length data to the Server with JQUERY & Coldfusion

  - by nobosh

  I'm looking to post the following type of data to a server using JQUERY & Coldfusion: foodID - int foodDESC - text html text from a WYSIWYG (CKEDITOR) --there will always be just 1 foodID and foodDESC per POST to the server but there can be a variable number of: locationID - int LocationDesc - text --There can be 0-8+ of these. Should I send this in one post or multiple posts? If one post, what's the smartest way to do this? I'm never had to deal with this much data before. Thank you

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• resizing arrays when close to memory capacity

  - by user548928

  So I am implementing my own hashtable in java, since the built in hashtable has ridiculous memory overhead per entry. I'm making an open-addressed table with a variant of quadratic hashing, which is backed internally by two arrays, one for keys and one for values. I don't have the ability to resize though. The obvious way to do it is to create larger arrays and then hash all of the (key, value) pairs into the new arrays from the old ones. This falls apart though when my old arrays take up over 50% of my current memory, since I can't fit both the old and new arrays in memory at the same time. Is there any way to resize my hashtable in this situation Edit: the info I got for current hashtable memory overheads is from here How much memory does a Hashtable use? Also, for my current application, my values are ints, so rather than store references to Integers, I have an array of ints as my values.

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• Other SecurityManager implementations available?

  - by mhaller

  Is there any other implementation (e.g. in an OSS project) of a Java SecurityManager available which has more features than the one in the JDK? I'm looking for features like configurable at runtime policies updateable at runtime, read from other data sources than a security.policy file Thread-aware, e.g. different policies per Thread Higher-level policies, e.g. "Disable network functions, but allow JDBC traffic" Common predefined policies, e.g. "Allow read-access to usual system properties like file.encoding or line.separator, but disallow read-access to user.home" Monitoring and audit trace logging, e.g. "Log all file access, log all network access going NOT to knownhost.example.org" Blocking jobs "requesting" a permission until an administrator grants permission, letting the thread/job continue ... I'm pretty sure that application servers (at least the commercial ones) have their own SecurityManager implementation or at least their own policy configuration. I'm wondering if there is any free project with similar requirements.

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• Canonicalizing XML in Ruby

  - by whazzmaster

  I'm working on a SAML gateway using Ruby/Rails and I'm attempting to write some code that validates the xml digital signature of the incoming SAML response against the x509 cert of the originating service. My problem: the signature depends on a canonicalized version of the XML that is hashed and then signed and I'm having trouble finding a ruby lib/gem that will canonicalize XML per the spec. I found a super old gem on rubyforge that is a mess but I'd be more interested if something like nokogiri supported this kind of functionality (from the nokogiri docs, it doesn't). I've googled extensively but thought I'd ask around here to see if anyone has any good insights before I go and try to write my own version or rework the existing c14n-r library.

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• innodb lock wait timeout

  - by shantanuo

  As per the documentation link given below: When a lock wait timeout occurs, the current statement is not executed. The current transaction is not rolled back. (Until MySQL 5.0.13 InnoDB rolled back the entire transaction if a lock wait timeout happened. You can restore this behavior by starting the server with the --innodb_rollback_on_timeout option, available as of MySQL 5.0.32. http://dev.mysql.com/doc/refman/5.0/en/innodb-parameters.html#sysvar_innodb_lock_wait_timeout Does it mean that when a lock wait timeout occurs, it compromises the transactional integrity? "roollback on timeout" was the default behaviour till 5.0.13 and I guess that was the correct way to handle such situations. Does anyone think that this should be the default behaviour and the user should not be asked to add a parameter for a functionality that is taken for granted?

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• VB.NET For Each steps into loop body for an IEnumerable collection! How? Why?

  - by Paul Sasik

  This is weird. I have a class that inherits from IEnumrable whose Count property is reporting 0 (zero) elements but the For Each loop steps into the loop body and tries to use the variable where it should just be moving on. My code: On Error Resume Next Dim d As Foo For Each d In fooCollection ' use d and throws an exception Next d Weirder still, every time d is accessed i get an exception thrown in the output window: A first chance exception of type 'System.NullReferenceException' but i'm not stopping on the exception (not in a try/catch block). Is "On Error Resume Next" causing this weirdness? Weirdness found: Per Rowland's and JohnH's comments i checked the Foo class: The GetEnumerator method inside of Foo didn't actually return anything! It had an empty body. That coupled with the On Error Resume Next before the loop caused the havoc! Wow this was ugly. Thanks for the clues guys!

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• Rails Multiple Table Inheritance question

  - by Tony

  I am starting to implement an MTI solution and have a basic question. I have 3 physical models - SMSNotifications, EmailNotifications, TwitterNotifications and they are subclasses of notification. At times in my code, I want to say Notifications.find(:all)so that I can get a set of results sorted by their creation time. Then I want to do things based on their subclass. What is the way to write Notifications.find(:all) and have Rails look through the subclass tables and combine the results? Right now Rails still thinks I have a physical Notifications table which goes against my MTI design. I am also considering the possibility that I should be using STI instead. I would probably have 10 empty columns per row but if getting all notifications requires a query for each type of notification, then I feel like this could be a big issue. Thanks!

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• Sample/Example needed for a table/field setup

  - by acctman

  Can someone explain the statement below to me with a working sample/example. thanks in advance. You can not create duplicate fields, but simply add a single extra field, "coupleId", which would have a unique id for each couple; and two rows (one for each person) per couple; then JOIN the table against itself with a constraint like a.coupleId = b.coupleId AND a.id < b.id so that you can condense the data into a single result row for a given couple.

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• How can i show delete image in each row in a Data grid ?

  - by developer

  i want show a image onmouse over inside data grid to each row,so if i click on that image,some function should call(as per my requirement). how can i do this ? <mx:DataGrid width="320" height="624" verticalScrollPolicy="on" dataProvider="{blocked_Usernames}" editable="true"> <mx:columns> <mx:DataGridColumn headerText="Blocked User Name" dataField="blockedUsernames" editorDataField="value"/> <mx:DataGridColumn width="20" editable="false"> <mx:itemRenderer > <mx:Component > <mx:Image source="@Embed('assets/image/Close.png')" width="10" height="10" autoLoad="false"/> </mx:Component> </mx:itemRenderer> </mx:DataGridColumn> </mx:columns> </mx:DataGrid>

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• Maximum File Size and Pixels for Uploaded Business Documents

  - by webdevguy

  I am creating a php form that accepts an upload of business documents in a variety of formats .pdf, .doc, .tiff, .jpeg, etc. and I need to restrict the size of the files that are uploaded. It's trivial for me to restrict the file size, but I'm not sure if I should also restrict the max height/width, which are also available options. I will need to occasionally print these documents to 8.5 X 11inch paper and have them be legible, but don't really care if images come out. Should I restrict the pixels sizes or is that redundant with restricting the file size? If so, do you guys have a recommendations for max height/width for, say, a 5MB file size limit? I really have no idea what the relationship between pixel size and image size is or what the common pixel sizes are for scanned images. Also, what would be a reasonable size expectation for a legible print per page?

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