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• Silverlight Cream for May 17, 2010 -- #863

  - by Dave Campbell

  In this Issue: Christian Schormann, Vladimir Bodurov, Pete Brown, Justin Angel, John Papa(-2-), Fons Sonnemans, Miroslav Miroslavov, and Jeremy Likness. Shoutouts: Jeff Brand has been doing WP7 presentations and posted Windows Phone 7 Presentation and Sample Code Mark Tucker posted about his Windows Phone 7 Presentation at Desert Code Camp 2010 John Allwright discusses 4 New case Studies on Silverlight at the Winter Olympics From SilverlightCream.com: New Video by Jon Harris: Blend 4 for Windows Phone in 90 Seconds Christian Schormann is discussing a second 90-second Expression Blend video tutorial by Jon Harris... this second one is about Blend 4 for WP7. XmlCodeEditor – Silverlight 4 control for editing XML and HTML on the browser Vladimir Bodurov has a post up extending the RichTextBox control to add coloring for HTML and XAML ... it colors as you type, and he plans on adding Intellisense! Creating a Simple Report Writer in Silverlight 4 While working on his book, Pete Brown decided to share some Silverlight 'Report Writer' work with us... check out that list of goals near the top that are all met... looks great to me! Windows Phone 7 - Unlocked ROMs Justin Angel has a good long post about a subject I've stayed away from until now that someone of Justin's level of knowledge has approached it: WP7 ROMs. Silverlight 4 Tools for Visual Studio 2010 Launch: New Designer Capabilities (Silverlight TV 27) John Papa has Silverlight TV 27 up today and is talking about the Silverlight 4 Tools for VS2010 launch with Mark Wilson-Thomas ... the video would be a great place to pick up some of the new features (hint, hint) WCF RIA Services v1.0 Launch! (Silverlight TV 28) John Papa also has Silverlight TV 28 up, talking with Nikhil Kothari and Dinesh Kulkarni about the v 1.0 release of WCF RIA Services. RightMouseTrigger Fons Sonnemans updated his MineSweeper game and has it posted at Silver Arcade, this version supports right mouse click via RightMouseTrigger code that he is sharing. Smoke effect The 'Smoke Effect' menus at the CompleteIT site are awesome, and this time out, Miroslav Miroslavov discusses how that was done and gives up the code...! WebClient and DeploymentCatalog gotchas in Silverlight OOB Jeremy Likness has a post up to give you some relief if you hit the same MEF/Silverlight gotcha he did when running OOB... like not running in OOB for instance. Stay in the 'Light! Twitter SilverlightNews | Twitter WynApse | WynApse.com | Tagged Posts | SilverlightCream Join me @ SilverlightCream | Phoenix Silverlight User Group Technorati Tags: Silverlight    Silverlight 3    Silverlight 4    Windows Phone MIX10

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• PTLQueue : a scalable bounded-capacity MPMC queue

  - by Dave

  Title: Fast concurrent MPMC queue -- I've used the following concurrent queue algorithm enough that it warrants a blog entry. I'll sketch out the design of a fast and scalable multiple-producer multiple-consumer (MPSC) concurrent queue called PTLQueue. The queue has bounded capacity and is implemented via a circular array. Bounded capacity can be a useful property if there's a mismatch between producer rates and consumer rates where an unbounded queue might otherwise result in excessive memory consumption by virtue of the container nodes that -- in some queue implementations -- are used to hold values. A bounded-capacity queue can provide flow control between components. Beware, however, that bounded collections can also result in resource deadlock if abused. The put() and take() operators are partial and wait for the collection to become non-full or non-empty, respectively. Put() and take() do not allocate memory, and are not vulnerable to the ABA pathologies. The PTLQueue algorithm can be implemented equally well in C/C++ and Java. Partial operators are often more convenient than total methods. In many use cases if the preconditions aren't met, there's nothing else useful the thread can do, so it may as well wait via a partial method. An exception is in the case of work-stealing queues where a thief might scan a set of queues from which it could potentially steal. Total methods return ASAP with a success-failure indication. (It's tempting to describe a queue or API as blocking or non-blocking instead of partial or total, but non-blocking is already an overloaded concurrency term. Perhaps waiting/non-waiting or patient/impatient might be better terms). It's also trivial to construct partial operators by busy-waiting via total operators, but such constructs may be less efficient than an operator explicitly and intentionally designed to wait. A PTLQueue instance contains an array of slots, where each slot has volatile Turn and MailBox fields. The array has power-of-two length allowing mod/div operations to be replaced by masking. We assume sensible padding and alignment to reduce the impact of false sharing. (On x86 I recommend 128-byte alignment and padding because of the adjacent-sector prefetch facility). Each queue also has PutCursor and TakeCursor cursor variables, each of which should be sequestered as the sole occupant of a cache line or sector. You can opt to use 64-bit integers if concerned about wrap-around aliasing in the cursor variables. Put(null) is considered illegal, but the caller or implementation can easily check for and convert null to a distinguished non-null proxy value if null happens to be a value you'd like to pass. Take() will accordingly convert the proxy value back to null. An advantage of PTLQueue is that you can use atomic fetch-and-increment for the partial methods. We initialize each slot at index I with (Turn=I, MailBox=null). Both cursors are initially 0. All shared variables are considered "volatile" and atomics such as CAS and AtomicFetchAndIncrement are presumed to have bidirectional fence semantics. Finally T is the templated type. I've sketched out a total tryTake() method below that allows the caller to poll the queue. tryPut() has an analogous construction. Zebra stripping : alternating row colors for nice-looking code listings. See also google code "prettify" : https://code.google.com/p/google-code-prettify/ Prettify is a javascript module that yields the HTML/CSS/JS equivalent of pretty-print. -- pre:nth-child(odd) { background-color:#ff0000; } pre:nth-child(even) { background-color:#0000ff; } border-left: 11px solid #ccc; margin: 1.7em 0 1.7em 0.3em; background-color:#BFB; font-size:12px; line-height:65%; " // PTLQueue : Put(v) : // producer : partial method - waits as necessary assert v != null assert Mask = 1 && (Mask & (Mask+1)) == 0 // Document invariants // doorway step // Obtain a sequence number -- ticket // As a practical concern the ticket value is temporally unique // The ticket also identifies and selects a slot auto tkt = AtomicFetchIncrement (&PutCursor, 1) slot * s = &Slots[tkt & Mask] // waiting phase : // wait for slot's generation to match the tkt value assigned to this put() invocation. // The "generation" is implicitly encoded as the upper bits in the cursor // above those used to specify the index : tkt div (Mask+1) // The generation serves as an epoch number to identify a cohort of threads // accessing disjoint slots while s-Turn != tkt : Pause assert s-MailBox == null s-MailBox = v // deposit and pass message Take() : // consumer : partial method - waits as necessary auto tkt = AtomicFetchIncrement (&TakeCursor,1) slot * s = &Slots[tkt & Mask] // 2-stage waiting : // First wait for turn for our generation // Acquire exclusive "take" access to slot's MailBox field // Then wait for the slot to become occupied while s-Turn != tkt : Pause // Concurrency in this section of code is now reduced to just 1 producer thread // vs 1 consumer thread. // For a given queue and slot, there will be most one Take() operation running // in this section. // Consumer waits for producer to arrive and make slot non-empty // Extract message; clear mailbox; advance Turn indicator // We have an obvious happens-before relation : // Put(m) happens-before corresponding Take() that returns that same "m" for T v = s-MailBox if v != null : s-MailBox = null ST-ST barrier s-Turn = tkt + Mask + 1 // unlock slot to admit next producer and consumer return v Pause tryTake() : // total method - returns ASAP with failure indication for auto tkt = TakeCursor slot * s = &Slots[tkt & Mask] if s-Turn != tkt : return null T v = s-MailBox // presumptive return value if v == null : return null // ratify tkt and v values and commit by advancing cursor if CAS (&TakeCursor, tkt, tkt+1) != tkt : continue s-MailBox = null ST-ST barrier s-Turn = tkt + Mask + 1 return v The basic idea derives from the Partitioned Ticket Lock "PTL" (US20120240126-A1) and the MultiLane Concurrent Bag (US8689237). The latter is essentially a circular ring-buffer where the elements themselves are queues or concurrent collections. You can think of the PTLQueue as a partitioned ticket lock "PTL" augmented to pass values from lock to unlock via the slots. Alternatively, you could conceptualize of PTLQueue as a degenerate MultiLane bag where each slot or "lane" consists of a simple single-word MailBox instead of a general queue. Each lane in PTLQueue also has a private Turn field which acts like the Turn (Grant) variables found in PTL. Turn enforces strict FIFO ordering and restricts concurrency on the slot mailbox field to at most one simultaneous put() and take() operation. PTL uses a single "ticket" variable and per-slot Turn (grant) fields while MultiLane has distinct PutCursor and TakeCursor cursors and abstract per-slot sub-queues. Both PTL and MultiLane advance their cursor and ticket variables with atomic fetch-and-increment. PTLQueue borrows from both PTL and MultiLane and has distinct put and take cursors and per-slot Turn fields. Instead of a per-slot queues, PTLQueue uses a simple single-word MailBox field. PutCursor and TakeCursor act like a pair of ticket locks, conferring "put" and "take" access to a given slot. PutCursor, for instance, assigns an incoming put() request to a slot and serves as a PTL "Ticket" to acquire "put" permission to that slot's MailBox field. To better explain the operation of PTLQueue we deconstruct the operation of put() and take() as follows. Put() first increments PutCursor obtaining a new unique ticket. That ticket value also identifies a slot. Put() next waits for that slot's Turn field to match that ticket value. This is tantamount to using a PTL to acquire "put" permission on the slot's MailBox field. Finally, having obtained exclusive "put" permission on the slot, put() stores the message value into the slot's MailBox. Take() similarly advances TakeCursor, identifying a slot, and then acquires and secures "take" permission on a slot by waiting for Turn. Take() then waits for the slot's MailBox to become non-empty, extracts the message, and clears MailBox. Finally, take() advances the slot's Turn field, which releases both "put" and "take" access to the slot's MailBox. Note the asymmetry : put() acquires "put" access to the slot, but take() releases that lock. At any given time, for a given slot in a PTLQueue, at most one thread has "put" access and at most one thread has "take" access. This restricts concurrency from general MPMC to 1-vs-1. We have 2 ticket locks -- one for put() and one for take() -- each with its own "ticket" variable in the form of the corresponding cursor, but they share a single "Grant" egress variable in the form of the slot's Turn variable. Advancing the PutCursor, for instance, serves two purposes. First, we obtain a unique ticket which identifies a slot. Second, incrementing the cursor is the doorway protocol step to acquire the per-slot mutual exclusion "put" lock. The cursors and operations to increment those cursors serve double-duty : slot-selection and ticket assignment for locking the slot's MailBox field. At any given time a slot MailBox field can be in one of the following states: empty with no pending operations -- neutral state; empty with one or more waiting take() operations pending -- deficit; occupied with no pending operations; occupied with one or more waiting put() operations -- surplus; empty with a pending put() or pending put() and take() operations -- transitional; or occupied with a pending take() or pending put() and take() operations -- transitional. The partial put() and take() operators can be implemented with an atomic fetch-and-increment operation, which may confer a performance advantage over a CAS-based loop. In addition we have independent PutCursor and TakeCursor cursors. Critically, a put() operation modifies PutCursor but does not access the TakeCursor and a take() operation modifies the TakeCursor cursor but does not access the PutCursor. This acts to reduce coherence traffic relative to some other queue designs. It's worth noting that slow threads or obstruction in one slot (or "lane") does not impede or obstruct operations in other slots -- this gives us some degree of obstruction isolation. PTLQueue is not lock-free, however. The implementation above is expressed with polite busy-waiting (Pause) but it's trivial to implement per-slot parking and unparking to deschedule waiting threads. It's also easy to convert the queue to a more general deque by replacing the PutCursor and TakeCursor cursors with Left/Front and Right/Back cursors that can move either direction. Specifically, to push and pop from the "left" side of the deque we would decrement and increment the Left cursor, respectively, and to push and pop from the "right" side of the deque we would increment and decrement the Right cursor, respectively. We used a variation of PTLQueue for message passing in our recent OPODIS 2013 paper. ul { list-style:none; padding-left:0; padding:0; margin:0; margin-left:0; } ul#myTagID { padding: 0px; margin: 0px; list-style:none; margin-left:0;} -- -- There's quite a bit of related literature in this area. I'll call out a few relevant references: Wilson's NYU Courant Institute UltraComputer dissertation from 1988 is classic and the canonical starting point : Operating System Data Structures for Shared-Memory MIMD Machines with Fetch-and-Add. Regarding provenance and priority, I think PTLQueue or queues effectively equivalent to PTLQueue have been independently rediscovered a number of times. See CB-Queue and BNPBV, below, for instance. But Wilson's dissertation anticipates the basic idea and seems to predate all the others. Gottlieb et al : Basic Techniques for the Efficient Coordination of Very Large Numbers of Cooperating Sequential Processors Orozco et al : CB-Queue in Toward high-throughput algorithms on many-core architectures which appeared in TACO 2012. Meneghin et al : BNPVB family in Performance evaluation of inter-thread communication mechanisms on multicore/multithreaded architecture Dmitry Vyukov : bounded MPMC queue (highly recommended) Alex Otenko : US8607249 (highly related). John Mellor-Crummey : Concurrent queues: Practical fetch-and-phi algorithms. Technical Report 229, Department of Computer Science, University of Rochester Thomasson : FIFO Distributed Bakery Algorithm (very similar to PTLQueue). Scott and Scherer : Dual Data Structures I'll propose an optimization left as an exercise for the reader. Say we wanted to reduce memory usage by eliminating inter-slot padding. Such padding is usually "dark" memory and otherwise unused and wasted. But eliminating the padding leaves us at risk of increased false sharing. Furthermore lets say it was usually the case that the PutCursor and TakeCursor were numerically close to each other. (That's true in some use cases). We might still reduce false sharing by incrementing the cursors by some value other than 1 that is not trivially small and is coprime with the number of slots. Alternatively, we might increment the cursor by one and mask as usual, resulting in a logical index. We then use that logical index value to index into a permutation table, yielding an effective index for use in the slot array. The permutation table would be constructed so that nearby logical indices would map to more distant effective indices. (Open question: what should that permutation look like? Possibly some perversion of a Gray code or De Bruijn sequence might be suitable). As an aside, say we need to busy-wait for some condition as follows : "while C == 0 : Pause". Lets say that C is usually non-zero, so we typically don't wait. But when C happens to be 0 we'll have to spin for some period, possibly brief. We can arrange for the code to be more machine-friendly with respect to the branch predictors by transforming the loop into : "if C == 0 : for { Pause; if C != 0 : break; }". Critically, we want to restructure the loop so there's one branch that controls entry and another that controls loop exit. A concern is that your compiler or JIT might be clever enough to transform this back to "while C == 0 : Pause". You can sometimes avoid this by inserting a call to a some type of very cheap "opaque" method that the compiler can't elide or reorder. On Solaris, for instance, you could use :"if C == 0 : { gethrtime(); for { Pause; if C != 0 : break; }}". It's worth noting the obvious duality between locks and queues. If you have strict FIFO lock implementation with local spinning and succession by direct handoff such as MCS or CLH,then you can usually transform that lock into a queue. Hidden commentary and annotations - invisible : * And of course there's a well-known duality between queues and locks, but I'll leave that topic for another blog post. * Compare and contrast : PTLQ vs PTL and MultiLane * Equivalent : Turn; seq; sequence; pos; position; ticket * Put = Lock; Deposit Take = identify and reserve slot; wait; extract & clear; unlock * conceptualize : Distinct PutLock and TakeLock implemented as ticket lock or PTL Distinct arrival cursors but share per-slot "Turn" variable provides exclusive role-based access to slot's mailbox field put() acquires exclusive access to a slot for purposes of "deposit" assigns slot round-robin and then acquires deposit access rights/perms to that slot take() acquires exclusive access to slot for purposes of "withdrawal" assigns slot round-robin and then acquires withdrawal access rights/perms to that slot At any given time, only one thread can have withdrawal access to a slot at any given time, only one thread can have deposit access to a slot Permissible for T1 to have deposit access and T2 to simultaneously have withdrawal access * round-robin for the purposes of; role-based; access mode; access role mailslot; mailbox; allocate/assign/identify slot rights; permission; license; access permission; * PTL/Ticket hybrid Asymmetric usage ; owner oblivious lock-unlock pairing K-exclusion add Grant cursor pass message m from lock to unlock via Slots[] array Cursor performs 2 functions : + PTL ticket + Assigns request to slot in round-robin fashion Deconstruct protocol : explication put() : allocate slot in round-robin fashion acquire PTL for "put" access store message into slot associated with PTL index take() : Acquire PTL for "take" access // doorway step seq = fetchAdd (&Grant, 1) s = &Slots[seq & Mask] // waiting phase while s-Turn != seq : pause Extract : wait for s-mailbox to be full v = s-mailbox s-mailbox = null Release PTL for both "put" and "take" access s-Turn = seq + Mask + 1 * Slot round-robin assignment and lock "doorway" protocol leverage the same cursor and FetchAdd operation on that cursor FetchAdd (&Cursor,1) + round-robin slot assignment and dispersal + PTL/ticket lock "doorway" step waiting phase is via "Turn" field in slot * PTLQueue uses 2 cursors -- put and take. Acquire "put" access to slot via PTL-like lock Acquire "take" access to slot via PTL-like lock 2 locks : put and take -- at most one thread can access slot's mailbox Both locks use same "turn" field Like multilane : 2 cursors : put and take slot is simple 1-capacity mailbox instead of queue Borrow per-slot turn/grant from PTL Provides strict FIFO Lock slot : put-vs-put take-vs-take at most one put accesses slot at any one time at most one put accesses take at any one time reduction to 1-vs-1 instead of N-vs-M concurrency Per slot locks for put/take Release put/take by advancing turn * is instrumental in ... * P-V Semaphore vs lock vs K-exclusion * See also : FastQueues-excerpt.java dice-etc/queue-mpmc-bounded-blocking-circular-xadd/ * PTLQueue is the same as PTLQB - identical * Expedient return; ASAP; prompt; immediately * Lamport's Bakery algorithm : doorway step then waiting phase Threads arriving at doorway obtain a unique ticket number Threads enter in ticket order * In the terminology of Reed and Kanodia a ticket lock corresponds to the busy-wait implementation of a semaphore using an eventcount and a sequencer It can also be thought of as an optimization of Lamport's bakery lock was designed for fault-tolerance rather than performance Instead of spinning on the release counter, processors using a bakery lock repeatedly examine the tickets of their peers --

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• XNA Notes 001

  - by George Clingerman

  Just a quick recap of things I noticed going on in or around the XNA community this past week. I’m sure there’s a lot I missed (it’s a pretty big community with lots of different parts to it) but these where the things I caught that I thought were pretty cool. The XNA Team Michael Klucher gave a list of books every gamer should read. http://twitter.com/#!/mklucher/status/22313041135673344 Shawn Hargreaves posted Nelxon Studio posting about a cheatsheet for converting 3.1 to 4.0 http://blogs.msdn.com/b/shawnhar/archive/2011/01/04/xna-3-1-to-4-0-cheat-sheet.aspx?utm_source=twitterfeed&utm_medium=twitter XNA Game Studio won the Frontline award for Programming Tool by GameDev magazine! Congrats to the XNA team! http://www.gdmag.com/homepage.htm XNA MVPs In January several MVPs were up for re-election, Jim Perry, Andy ‘The ZMan’ Dunn, Glenn Wilson and myself were all re-award a Microsoft MVP award for their contributions to the XNA/DirectX communities. https://mvp.support.microsoft.com/communities/mvp.aspx?product=1&competency=XNA%2fDirectX A movement to get Michael McLaughlin an MVP award has started and you can join in too! http://twitter.com/#!/theBigDaddio/status/22744458621620224 http://www.xnadevelopment.com/MVP/MichaelMcLaughlinMVP.txt Don’t forget you can nominate ANYONE for a MVP award, that’s how they work. https://mvp.support.microsoft.com/gp/mvpbecoming  XNA Developers James Silva of Ska Studios hit 9,200 sales of ZP2KX and recommends you listen to Infected Mushroom. http://twitter.com/#!/Jamezila/status/22538865357094912 http://en.wikipedia.org/wiki/Infected_Mushroom Noogy creator of the upcoming XBLA title Dust an Elysian tail posts some details into his art creation. http://noogy.com/image/statue/statue.html Xbox LIVE Indie Game News Microsoft posts acknowledging there was an issue with the sales data that has been addressed and apologized for not posting about it sooner. http://forums.create.msdn.com/forums/p/71347/436154.aspx#436154 Winter Uprising sales still chugging along and being updated by Xalterax (by those developers willing to actually share sales numbers. Thanks for sharing guys, much appreciated!) http://forums.create.msdn.com/forums/t/70147.aspx Don’t forget about Dream Build Play coming up in February! http://www.dreambuildplay.com/Main/Home.aspx The Best Xbox LIVE Indie Games December Edition comes out on NeoGaf http://www.neogaf.com/forum/showthread.php?t=414485 The Greatest XBox LIVE Indie Games of 2010 on DealSpwn – Congrats to DrMistry and MStarGames for his #1 spot with his massive XBLIG Space Pirates From Tomorrow! http://www.dealspwn.com/xbligoty-2010/?utm_source=feedburner&utm_medium=feed&utm_campaign=Feed%3A+Dealspwn+%28Dealspwn%29 XNA Game Development The future of XACT and WP7 has finally been confirmed and we finally know what our options are for looping audio seamlessly on WP7. http://forums.create.msdn.com/forums/p/61826/436639.aspx#436639  Super Mario 3 Design Notes is an interesting read for XBLIG developers, giving some insight to the training that natural occurs for players as they start playing the game. Good things for XBLIG developers to think about. http://www.significant-bits.com/super-mario-bros-3-level-design-lessons

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• ArchBeat Link-o-Rama for 2012-04-05

  - by Bob Rhubart

  Webcast: Oracle Maximum Availability Architecture Best Practices event.on24.com Date: Thursday, April 12, 2012 Time: 10:00 AM PDT Oracle expert Tom Kyte discusses how Oracle’s Maximum Availability Architecture can help to minimize the costs and risk of downtime. Oracle Enterprise Manager Ops Center 12c Launch - Interactive Webcast and Live Chat www.oracle.com Thursday, April 12, 2012. 9 a.m. PT / 12 p.m. ET / 4 p.m. GMT. Speakers: Steve Wilson (VP Systems Management, Oracle) John Fowler (Exec VP Systems, Oracle) Brad Cameron (VP Development, Oracle Fusion Middleware) Bill Nesheim (VP Oracle Solaris) Dennis Reno (VP Customer Portal Experience, Oracle) Mike Wookey (Chief Architect, Oracle Enterprise Manager Ops Center) Prasad Pai (Sr Director, Oracle Enterprise Manager Ops Center) 2012 Real World Performance Tour Dates |Performance Tuning | Performance Engineering www.ioug.org Coming to your town: a full day of real world database performance with Tom Kyte, Andrew Holdsworth, and Graham Wood. Rochester, NY - March 8 Los Angeles, CA - April 30 Orange County, CA - May 1 Redwood Shores, CA - May 3 Oracle Technology Network Developer Day: MySQL - New York www.oracle.com Wednesday, May 02, 2012 8:00 AM – 4:30 PM Grand Hyatt New York 109 East 42nd Street, Grand Central Terminal New York, NY 10017 Webcast Series: Data Warehousing Best Practices event.on24.com April 19, 2012 - Best Practices for Workload Management of a Data Warehouse on Oracle Exadata May 10, 2012 - Best Practices for Extreme Data Warehouse Performance on Oracle Exadata How to create a Global Rule that stores a document’s folder path in a custom metadata field | Nicolas Montoya blogs.oracle.com An illustrated how-to from Oracle Fusion Middleware A-Team blogger Nicolas Montoya. Get Proactive with Fusion Middleware | Daniel Mortimer blogs.oracle.com Daniel Mortimer shows how to access "a one stop shop for navigating to proactive support material, tools, and communication channels related to Oracle Fusion Middleware." Build an enterprise on 'other peoples' work', via SOA and cloud | Joe McKendrick www.zdnet.com Are you down with OPW? Joe McKendrick's synopsis of a recent presentation by David Linthicum focuses on reuse. Oracle Fusion Middleware Security: Unsolicited login with OAM 11g | Chris Johnson fusionsecurity.blogspot.com Chris Johnson shows how to create a shopping cart login model using "plain old HTML." How to use the Human WorkFlow Web Services | Edwin Biemond biemond.blogspot.com Oracle ACE Edwin Biemond shows how to invoke two WorkFlow web services to query the Human task in Oracle SOA Suite with your own ordering and restrictions. Bad Practice Use Case for LOV Performance Implementation in ADF BC | Andrejus Baranovskis andrejusb.blogspot.com "If you want to learn something well, there is nothing better [than] to learn bad practices first," says Oracle ACE Director Andrejus Baranovskis. Thought for the Day "The best meetings get real work done. When your people learn that your meetings actually accomplish something, they will stop making excuses to be elsewhere." — Larry Constantine

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• I need to move an entity to the mouse location after i rightclick

  - by I.Hristov

  Well I've read the related questions-answers but still cant find a way to move my champion to the mouse position after a right-button mouse-click. I use this code at the top: float speed = (float)1/3; And this is in my void Update: //check if right mouse button is clicked if (mouse.RightButton == ButtonState.Released && previousButtonState == ButtonState.Pressed) { // gets the position of the mouse in mousePosition mousePosition = new Vector2(mouse.X, mouse.Y); //gets the current position of champion (the drawRectangle) currentChampionPosition = new Vector2(drawRectangle.X, drawRectangle.Y); // move champion to mouse position: //handles the case when the mouse position is really close to current position if (Math.Abs(currentChampionPosition.X - mousePosition.X) <= speed && Math.Abs(currentChampionPosition.Y - mousePosition.Y) <= speed) { drawRectangle.X = (int)mousePosition.X; drawRectangle.Y = (int)mousePosition.Y; } else if (currentChampionPosition != mousePosition) { drawRectangle.X += (int)((mousePosition.X - currentChampionPosition.X) * speed); drawRectangle.Y += (int)((mousePosition.Y - currentChampionPosition.Y) * speed); } } previousButtonState = mouse.RightButton; What that code does at the moment is on a click it brings the sprite 1/3 of the distance to the mouse but only once. How do I make it move consistently all the time? It seems I am not updating the sprite at all. EDIT I added the Vector2 as Nick said and with speed changed to 50 it should be OK. I tried it with if ButtonState.Pressed and it works while pressing the button. Thanks. However I wanted it to start moving when single mouse clicked. It should be moving until reaches the mousePosition. The Edit of Nick's post says to create another Vector2, But I already have the one called mousePosition. Not sure how to use another one. //gets a Vector2 direction to move *by Nick Wilson Vector2 direction = mousePosition - currentChampionPosition; //make the direction vector a unit vector direction.Normalize(); //multiply with speed (number of pixels) direction *= speed; // move champion to mouse position if (currentChampionPosition != mousePosition) { drawRectangle.X += (int)(direction.X); drawRectangle.Y += (int)(direction.Y); } } previousButtonState = mouse.RightButton;

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• Images missing after moving Django to new server

  - by miszczu

  I'm moving Django project to new server. I'm newbie in Django, and I don't know where should be upload folder. There are all images which should be displayed on website. In config file I haven't seen upload folder I could specify, so I'm guessing it always should be the same location for django projects or I just can't find it. Locations are saved in database. When I've put uploaded files into media folder, so url was like domain.co.uk/media/upload/media/images/year/month/day/image_name.ext and the same is on the old website, images on website ware still missing. All images are visible if I put url by hand, but django doesn't seems to see files. Also I check django log file: 2012-05-30 09:13:33,393 ERROR render: Thumbnail tag failed: [in /usr/lib/python2.6/site-packages/sorl_thumbnail-11.12-py2.6.egg/sorl/thumbnail/templatetags/thumbnail.py (line 49)] Traceback (most recent call last): File "/usr/lib/python2.6/site-packages/sorl_thumbnail-11.12-py2.6.egg/sorl/thumbnail/templatetags/thumbnail.py", line 45, in render return self._render(context) File "/usr/lib/python2.6/site-packages/sorl_thumbnail-11.12-py2.6.egg/sorl/thumbnail/templatetags/thumbnail.py", line 97, in _render file_, geometry, **options File "/usr/lib/python2.6/site-packages/sorl_thumbnail-11.12-py2.6.egg/sorl/thumbnail/base.py", line 50, in get_thumbnail cached = default.kvstore.get(thumbnail) File "/usr/lib/python2.6/site-packages/sorl_thumbnail-11.12-py2.6.egg/sorl/thumbnail/kvstores/base.py", line 25, in get return self._get(image_file.key) File "/usr/lib/python2.6/site-packages/sorl_thumbnail-11.12-py2.6.egg/sorl/thumbnail/kvstores/base.py", line 123, in _get value = self._get_raw(add_prefix(key, identity)) File "/usr/lib/python2.6/site-packages/sorl_thumbnail-11.12-py2.6.egg/sorl/thumbnail/kvstores/cached_db_kvstore.py", line 26, in _get_raw value = KVStoreModel.objects.get(key=key).value File "/usr/lib/python2.6/site-packages/django/db/models/manager.py", line 132, in get return self.get_query_set().get(*args, **kwargs) File "/usr/lib/python2.6/site-packages/django/db/models/query.py", line 344, in get num = len(clone) File "/usr/lib/python2.6/site-packages/django/db/models/query.py", line 82, in __len__ self._result_cache = list(self.iterator()) File "/usr/lib/python2.6/site-packages/django/db/models/query.py", line 273, in iterator for row in compiler.results_iter(): File "/usr/lib/python2.6/site-packages/django/db/models/sql/compiler.py", line 680, in results_iter for rows in self.execute_sql(MULTI): File "/usr/lib/python2.6/site-packages/django/db/models/sql/compiler.py", line 735, in execute_sql cursor.execute(sql, params) File "/usr/lib/python2.6/site-packages/django/db/backends/util.py", line 34, in execute return self.cursor.execute(sql, params) File "/usr/lib/python2.6/site-packages/django/db/backends/mysql/base.py", line 86, in execute return self.cursor.execute(query, args) File "/usr/lib64/python2.6/site-packages/MySQLdb/cursors.py", line 174, in execute self.errorhandler(self, exc, value) File "/usr/lib64/python2.6/site-packages/MySQLdb/connections.py", line 36, in defaulterrorhandler raise errorclass, errorvalue DatabaseError: (1146, "Table 'thumbnail_kvstore' doesn't exist") 2012-05-30 09:13:33,396 DEBUG execute: (0.000) SELECT `freetext_freetext`.`id`, `freetext_freetext`.`key`, `freetext_freetext`.`content`, `freetext_freetext`.`active` FROM `freetext_freetext` WHERE (`freetext_freetext`.`active` = True AND `freetext_freetext`.`key` = office-closed-message ); args=(True, u'office-closed-message') [in /usr/lib/python2.6/site-packages/django/db/backends/util.py (line 44)] 2012-05-30 09:13:33,399 DEBUG execute: (0.000) SELECT `menus_menu`.`id`, `menus_menu`.`name`, `menus_menu`.`slug`, `menus_menu`.`base_url`, `menus_menu`.`description`, `menus_menu`.`enabled` FROM `menus_menu` WHERE (`menus_menu`.`enabled` = True AND `menus_menu`.`slug` = about ); args=(True, u'about') [in /usr/lib/python2.6/site-packages/django/db/backends/util.py (line 44)] 2012-05-30 09:13:33,401 DEBUG execute: (0.000) SELECT `menus_menuitem`.`id`, `menus_menuitem`.`menu_id`, `menus_menuitem`.`title`, `menus_menuitem`.`url`, `menus_menuitem`.`order` FROM `menus_menuitem` INNER JOIN `menus_menu` ON (`menus_menuitem`.`menu_id` = `menus_menu`.`id`) WHERE `menus_menu`.`slug` = about ORDER BY `menus_menuitem`.`order` ASC; args=(u'about',) [in /usr/lib/python2.6/site-packages/django/db/backends/util.py (line 44)] 2012-05-30 09:13:33,404 DEBUG execute: (0.000) SELECT `freetext_freetext`.`id`, `freetext_freetext`.`key`, `freetext_freetext`.`content`, `freetext_freetext`.`active` FROM `freetext_freetext` WHERE (`freetext_freetext`.`active` = True AND `freetext_freetext`.`key` = contactdetails-footer ); args=(True, u'contactdetails-footer') [in /usr/lib/python2.6/site-packages/django/db/backends/util.py (line 44)] I checked database and there is no table calls thumbnail_kvstore, but I have database backup, and in backup files this table doesn't exist. All uploaded files I get are in media/uploads/media/. Also I'm getting errors on some pages: Syntax error. Expected: ``thumbnail source geometry [key1=val1 key2=val2...] as var`` /usr/lib/python2.6/site-packages/sorl_thumbnail-11.12-py2.6.egg/sorl/thumbnail/templatetags/thumbnail.py in __init__, line 72 In template /var/www/vhosts/domain.co.uk/sites/apps/shop/products/templates/products/product_detail.html, error at line 34 {% thumbnail image.file "800x700" detail as zoom %} Maybe some modules I install are not in the right version. Dont know how to fix it. Im using, CentOS 6, mod_wsgi, apache, python 2.6. Update 1.0: On the old server was Django 1.3, on the new one is Django 1.3.1 Update 1.1: I this i know where is the problem. I tried python manage.py syncdb and this is output: Syncing... Creating tables ... The following content types are stale and need to be deleted: orders | ordercontact Any objects related to these content types by a foreign key will also be deleted. Are you sure you want to delete these content types? If you're unsure, answer 'no'. Type 'yes' to continue, or 'no' to cancel: no Installing custom SQL ... Installing indexes ... No fixtures found. Synced: > django.contrib.auth > django.contrib.contenttypes > django.contrib.sessions > django.contrib.sites > django.contrib.messages > django.contrib.admin > django.contrib.admindocs > django.contrib.markup > django.contrib.sitemaps > django.contrib.redirects > django_filters > freetext > sorl.thumbnail > django_extensions > south > currencies > pagination > tagging > honeypot > core > faq > logentry > menus > news > shop > shop.cart > shop.orders Not synced (use migrations): - dbtemplates - contactform - links - media - pages - popularity - testimonials - shop.brands - shop.collections - shop.discount - shop.pricing - shop.product_types - shop.products - shop.shipping - shop.tax (use ./manage.py migrate to migrate these) Next I run python manage.py migrate, and thats what i get: Running migrations for dbtemplates: - Migrating forwards to 0002_auto__del_unique_template_name. > dbtemplates:0001_initial ! Error found during real run of migration! Aborting. ! Since you have a database that does not support running ! schema-altering statements in transactions, we have had ! to leave it in an interim state between migrations. ! You *might* be able to recover with: = DROP TABLE `django_template` CASCADE; [] = DROP TABLE `django_template_sites` CASCADE; [] ! The South developers regret this has happened, and would ! like to gently persuade you to consider a slightly ! easier-to-deal-with DBMS. ! NOTE: The error which caused the migration to fail is further up. Traceback (most recent call last): File "manage.py", line 13, in <module> execute_manager(settings) File "/usr/lib/python2.6/site-packages/django/core/management/__init__.py", line 438, in execute_manager utility.execute() File "/usr/lib/python2.6/site-packages/django/core/management/__init__.py", line 379, in execute self.fetch_command(subcommand).run_from_argv(self.argv) File "/usr/lib/python2.6/site-packages/django/core/management/base.py", line 191, in run_from_argv self.execute(*args, **options.__dict__) File "/usr/lib/python2.6/site-packages/django/core/management/base.py", line 220, in execute output = self.handle(*args, **options) File "/usr/lib/python2.6/site-packages/South-0.7.3-py2.6.egg/south/management/commands/migrate.py", line 105, in handle ignore_ghosts = ignore_ghosts, File "/usr/lib/python2.6/site-packages/South-0.7.3-py2.6.egg/south/migration/__init__.py", line 191, in migrate_app success = migrator.migrate_many(target, workplan, database) File "/usr/lib/python2.6/site-packages/South-0.7.3-py2.6.egg/south/migration/migrators.py", line 221, in migrate_many result = migrator.__class__.migrate_many(migrator, target, migrations, database) File "/usr/lib/python2.6/site-packages/South-0.7.3-py2.6.egg/south/migration/migrators.py", line 292, in migrate_many result = self.migrate(migration, database) File "/usr/lib/python2.6/site-packages/South-0.7.3-py2.6.egg/south/migration/migrators.py", line 125, in migrate result = self.run(migration) File "/usr/lib/python2.6/site-packages/South-0.7.3-py2.6.egg/south/migration/migrators.py", line 99, in run return self.run_migration(migration) File "/usr/lib/python2.6/site-packages/South-0.7.3-py2.6.egg/south/migration/migrators.py", line 81, in run_migration migration_function() File "/usr/lib/python2.6/site-packages/South-0.7.3-py2.6.egg/south/migration/migrators.py", line 57, in <lambda> return (lambda: direction(orm)) File "/usr/lib/python2.6/site-packages/django_dbtemplates-1.3-py2.6.egg/dbtemplates/migrations/0001_initial.py", line 18, in forwards ('last_changed', self.gf('django.db.models.fields.DateTimeField')(default=datetime.datetime.now)), File "/usr/lib/python2.6/site-packages/South-0.7.3-py2.6.egg/south/db/generic.py", line 226, in create_table ', '.join([col for col in columns if col]), File "/usr/lib/python2.6/site-packages/South-0.7.3-py2.6.egg/south/db/generic.py", line 150, in execute cursor.execute(sql, params) File "/usr/lib/python2.6/site-packages/django/db/backends/util.py", line 34, in execute return self.cursor.execute(sql, params) File "/usr/lib/python2.6/site-packages/django/db/backends/mysql/base.py", line 86, in execute return self.cursor.execute(query, args) File "/usr/lib64/python2.6/site-packages/MySQLdb/cursors.py", line 174, in execute self.errorhandler(self, exc, value) File "/usr/lib64/python2.6/site-packages/MySQLdb/connections.py", line 36, in defaulterrorhandler raise errorclass, errorvalue _mysql_exceptions.OperationalError: (1050, "Table 'django_template' already exists") Also i run python manage.py migrate --list, and uotput is: dbtemplates (*) 0001_initial (*) 0002_auto__del_unique_template_name contactform (*) 0001_initial (*) 0002_auto__add_callback (*) 0003_auto__add_field_callback_notes (*) 0004_auto__add_field_callback_is_closed__add_field_callback_closed (*) 0005_auto__add_field_callback_url (*) 0006_auto__add_contact (*) 0007_auto__add_field_contact_category (*) 0008_auto__add_field_contact_url links (*) 0001_initial (*) 0002_auto__add_field_category_enabled__add_field_category_order media (*) 0001_initial (*) 0002_auto__del_field_image_external_url__add_field_image_link_url__del_fiel (*) 0003_add_model_FileAttachment (*) 0004_auto__chg_field_file_slug__chg_field_image_slug (*) 0005_auto__chg_field_image_file (*) 0006_auto__chg_field_file_file pages (*) 0001_initial (*) 0002_auto__chg_field_page_meta_description__chg_field_page_meta_title__chg_ (*) 0003_auto__add_field_page_show_in_sitemap (*) 0004_auto__add_field_page_changefreq__add_field_page_priority popularity (*) 0001_initial testimonials (*) 0001_initial (*) 0002_auto__add_field_testimonial_is_featured brands (*) 0001_initial (*) 0002_auto__add_field_brand_template (*) 0003_auto__chg_field_brand_meta_description__chg_field_brand_meta_title__ch (*) 0004_auto__add_field_brand_url (*) 0005_auto__del_field_brand_image__add_field_brand_logo collections (*) 0001_initial (*) 0002_auto__add_field_collection_discount (*) 0003_auto__chg_field_collection_meta_description__chg_field_collection_meta (*) 0004_auto__add_field_collection_is_featured (*) 0005_auto__add_field_collection_order discount (*) 0001_initial (*) 0002_added_field_discount_description (*) 0003_auto__add_field_discountvoucher_automatic (*) 0004_auto__add_field_discountvoucher_collection (*) 0005_auto__del_field_discountvoucher_collection (*) 0006_auto__chg_field_discountvoucher_expiry_date pricing (*) 0001_initial (*) 0002_auto__add_pricingrule product_types (*) 0001_initial (*) 0002_auto__add_field_producttype_meta_title__add_field_producttype_meta_des (*) 0003_auto__add_field_producttype_summary__add_field_producttype_description products (*) 0001_initial (*) 0002_auto__del_field_product_is_featured (*) 0003_auto__chg_field_product_meta_keywords__chg_field_product_meta_descript (*) 0004_auto shipping (*) 0001_initial (*) 0002_auto__add_field_shippingmethod_includes_tax__add_field_shippingmethod_ (*) 0003_auto__add_field_shippingmethod_order (*) 0004_auto__del_field_shippingmethod_tax_rate__del_field_shippingmethod_incl (*) 0005_auto__del_field_shippingrule_enabled tax (*) 0001_initial (*) 0002_auto__add_field_taxrate_internal_name (*) 0003_initial_internal_names (*) 0004_auto__add_unique_taxrate_internal_name (*) 0005_force_unique_taxrate_name (*) 0006_auto__add_unique_taxrate_name After that some images source were something like this: src="cache/1e/bd/1ebd719910aa843238028edd5fe49e71.jpg" Is any1 could help me with syncdb pledase?

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• Jquery change text ajax request problem

  - by blasteralfred

  Hi, I have an html file as coded below. <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <style> .style1 { background-color: #c3d9ff; font-family:arial,sans-serif; } .style2 { text-align: center; font-weight: bold; } .style3 { background-color: #FFFFFF; font-family:arial,sans-serif; text-align: center; font-weight: bold; } .style4 { background-color: #FFFFFF; font-family:arial,sans-serif; text-align: left; } body { font-family:Verdana, Arial, Helvetica, sans-serif; font-size:15px; background-color: ; } .action_button { font-weight:bold; float:right; } </style> <script type="text/javascript" src="jquery-1.4.4.min.js"></script> <script type="text/javascript">$(function() { $('.action_button').click(function() { var $button = $(this); $.ajax({ type: 'POST', url: 'action.php', data: 'id='+ $(this).attr('id'), cache: false, success: function(result) { var $row = $button.closest('tr'); var $col = $row.find('.clickme2'); $row.fadeOut('fast', function() { if (result == 'ACTIVATED') { $button.text('Activate'); $col.text('Active'); } else if (result == 'INACTIVATED') { $button.text('Inactivate'); $col.text('Inactive'); } }).fadeIn(); } }); return false; }); }); </script> </head> <body> <table style="width: 90%" align="center" class="style1"> <tr> <td colspan="7" class="style2">MANAGER</td> </tr> <tr> <td class="style3" style="width: 139px">Col1</td> <td class="style3" style="width: 139px">Col2</td> <td class="style3" style="width: 139px">Col3</td> <td class="style3" style="width: 139px">Col4</td> <td class="style3" style="width: 139px">Col5</td> <td class="style3" style="width: 200px">Col6</td> <td class="style3" style="">Action</td> </tr> </table> <td id="main" class="main"> <td class="update"> <table style="width: 90%" align="center" class="style1"> <tr> <td class="style4" style="width: 139px">DataA1</td> <td class="style4" style="width: 139px">DataA2</td> <td class="style4" style="width: 139px">DataA3</td> <td class="style4" style="width: 139px">DataA4</td> <td class="style4 clickme2" style="width: 139px">Inactive</td> <td class="style4" style="width: 200px">DataA6</td> <td> <button href="#" id="DataA1" class="action_button" style="width:80px;height:"> Activate</button> </td> </tr> <tr> <td class="style4" style="width: 139px">DataB1</td> <td class="style4" style="width: 139px">DataB2</td> <td class="style4" style="width: 139px">DataB3</td> <td class="style4" style="width: 139px">DataB4</td> <td class="style4 clickme2" style="width: 139px">Inactive</td> <td class="style4" style="width: 200px">DataB6</td> <td> <button href="#" id="DataB1" class="action_button" style="width:80px;height:"> Activate</button> </td> </tr> <tr> <td class="style4" style="width: 139px">DataC1</td> <td class="style4" style="width: 139px">DataC2</td> <td class="style4" style="width: 139px">DataC3</td> <td class="style4" style="width: 139px">DataC4</td> <td class="style4 clickme2" style="width: 139px">Active</td> <td class="style4" style="width: 200px">DataC6</td> <td> <button href="#" id="DataC1" class="action_button" style="width:80px;height:"> Inactivate</button> </td> </tr> <tr> <td class="style4" style="width: 139px">DataD1</td> <td class="style4" style="width: 139px">DataD2</td> <td class="style4" style="width: 139px">DataD3</td> <td class="style4" style="width: 139px">DataD4</td> <td class="style4 clickme2" style="width: 139px">Active</td> <td class="style4" style="width: 200px">DataD6</td> <td> <button href="#" id="DataD1" class="action_button" style="width:80px;height:"> Inactivate</button> </td> </tr> <tr> <td class="style4" style="width: 139px">DataE1</td> <td class="style4" style="width: 139px">DataE2</td> <td class="style4" style="width: 139px">DataE3</td> <td class="style4" style="width: 139px">DataE4</td> <td class="style4 clickme2" style="width: 139px">Inactive</td> <td class="style4" style="width: 200px">DataE6</td> <td> <button href="#" id="DataE1" class="action_button" style="width:80px;height:"> Activate</button> </td> </tr> </table> </td> </td> </body> </html> The fage contain a table with 5 rows with a button at the end of the row. On click, the button submits data to a php file and then changes text and blurs according to the response from php file. The blur function and change text function in col5 is working well. But the change text function in button got really buggy. The button text should change accordingly. the text of button "Activate" should change to "Inactivate" and the text of button "Inactivate" should change to "Activate" on click / successful submission.. This is not working.. Below is the php file code <?php $id = $_POST[id]; if($id=="DataA1"){ echo "ACTIVATED"; } if($id=="DataB1"){ echo "ACTIVATED"; } if($id=="DataE1"){ echo "ACTIVATED"; } if($id=="DataC1"){ echo "INACTIVATED"; } if($id=="DataD1"){ echo "INACTIVATED"; } ?> Thanks in advance.. :) blasteralfred

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• How to Make a Game like Space Invaders - Ray Wenderlich (why do my space invaders scroll off screen)

  - by Erv Noel

  I'm following this tutorial(http://www.raywenderlich.com/51068/how-to-make-a-game-like-space-invaders-with-sprite-kit-tutorial-part-1) and I've run into a problem right after the part where I add [self determineInvaderMovementDirection]; to my GameScene.m file (specifically to my moveInvadersForUpdate method) The tutorial states that the space invaders should be moving accordingly after adding this piece of code but when I run they move to the left and they do not come back. I'm not sure what I am doing wrong as I have followed this tutorial very carefully. Any help or clarification would be greatly appreciated. Thanks in advance ! Here is the full GameScene.m #import "GameScene.h" #import <CoreMotion/CoreMotion.h> #pragma mark - Custom Type Definitions /* The type definition and constant definitions 1,2,3 take care of the following tasks: 1.Define the possible types of invader enemies. This can be used in switch statements later when things like displaying different sprites images for each enemy type. The typedef makes InvaderType a formal Obj-C type that is type checked for method arguments and variables.This is so that the wrong method argument is not used or assigned to the wrong variable. 2. Define the size of the invaders and that they'll be laid out in a grid of rows and columns on the screen. 3. Define a name that will be used to identify invaders when searching for them. */ //1 typedef enum InvaderType { InvaderTypeA, InvaderTypeB, InvaderTypeC } InvaderType; /* Invaders move in a fixed pattern: right, right, down, left, down, right right. InvaderMovementDirection tracks the invaders' progress through this pattern */ typedef enum InvaderMovementDirection { InvaderMovementDirectionRight, InvaderMovementDirectionLeft, InvaderMovementDirectionDownThenRight, InvaderMovementDirectionDownThenLeft, InvaderMovementDirectionNone } InvaderMovementDirection; //2 #define kInvaderSize CGSizeMake(24,16) #define kInvaderGridSpacing CGSizeMake(12,12) #define kInvaderRowCount 6 #define kInvaderColCount 6 //3 #define kInvaderName @"invader" #define kShipSize CGSizeMake(30, 16) //stores the size of the ship #define kShipName @"ship" // stores the name of the ship stored on the sprite node #define kScoreHudName @"scoreHud" #define kHealthHudName @"healthHud" /* this class extension allows you to add “private” properties to GameScene class, without revealing the properties to other classes or code. You still get the benefit of using Objective-C properties, but your GameScene state is stored internally and can’t be modified by other external classes. As well, it doesn’t clutter the namespace of datatypes that your other classes see. This class extension is used in the method didMoveToView */ #pragma mark - Private GameScene Properties @interface GameScene () @property BOOL contentCreated; @property InvaderMovementDirection invaderMovementDirection; @property NSTimeInterval timeOfLastMove; @property NSTimeInterval timePerMove; @end @implementation GameScene #pragma mark Object Lifecycle Management #pragma mark - Scene Setup and Content Creation /*This method simply invokes createContent using the BOOL property contentCreated to make sure you don’t create your scene’s content more than once. This property is defined in an Objective-C Class Extension found near the top of the file()*/ - (void)didMoveToView:(SKView *)view { if (!self.contentCreated) { [self createContent]; self.contentCreated = YES; } } - (void)createContent { //1 - Invaders begin by moving to the right self.invaderMovementDirection = InvaderMovementDirectionRight; //2 - Invaders take 1 sec for each move. Each step left, right or down // takes 1 second. self.timePerMove = 1.0; //3 - Invaders haven't moved yet, so set the time to zero self.timeOfLastMove = 0.0; [self setupInvaders]; [self setupShip]; [self setupHud]; } /* Creates an invade sprite of a given type 1. Use the invadeType parameterr to determine color of the invader 2. Call spriteNodeWithColor:size: of SKSpriteNode to alloc and init a sprite that renders as a rect of the given color invaderColor with size kInvaderSize */ -(SKNode*)makeInvaderOfType:(InvaderType)invaderType { //1 SKColor* invaderColor; switch (invaderType) { case InvaderTypeA: invaderColor = [SKColor redColor]; break; case InvaderTypeB: invaderColor = [SKColor greenColor]; break; case InvaderTypeC: invaderColor = [SKColor blueColor]; break; } //2 SKSpriteNode* invader = [SKSpriteNode spriteNodeWithColor:invaderColor size:kInvaderSize]; invader.name = kInvaderName; return invader; } -(void)setupInvaders { //1 - loop over the rows CGPoint baseOrigin = CGPointMake(kInvaderSize.width / 2, 180); for (NSUInteger row = 0; row < kInvaderRowCount; ++row) { //2 - Choose a single InvaderType for all invaders // in this row based on the row number InvaderType invaderType; if (row % 3 == 0) invaderType = InvaderTypeA; else if (row % 3 == 1) invaderType = InvaderTypeB; else invaderType = InvaderTypeC; //3 - Does some math to figure out where the first invader // in the row should be positioned CGPoint invaderPosition = CGPointMake(baseOrigin.x, row * (kInvaderGridSpacing.height + kInvaderSize.height) + baseOrigin.y); //4 - Loop over the columns for (NSUInteger col = 0; col < kInvaderColCount; ++col) { //5 - Create an invader for the current row and column and add it // to the scene SKNode* invader = [self makeInvaderOfType:invaderType]; invader.position = invaderPosition; [self addChild:invader]; //6 - update the invaderPosition so that it's correct for the //next invader invaderPosition.x += kInvaderSize.width + kInvaderGridSpacing.width; } } } -(void)setupShip { //1 - creates ship using makeShip. makeShip can easily be used later // to create another ship (ex. to set up more lives) SKNode* ship = [self makeShip]; //2 - Places the ship on the screen. In SpriteKit the origin is at the lower //left corner of the screen. The anchorPoint is based on a unit square with (0, 0) at the lower left of the sprite's area and (1, 1) at its top right. Since SKSpriteNode has a default anchorPoint of (0.5, 0.5), i.e., its center, the ship's position is the position of its center. Positioning the ship at kShipSize.height/2.0f means that half of the ship's height will protrude below its position and half above. If you check the math, you'll see that the ship's bottom aligns exactly with the bottom of the scene. ship.position = CGPointMake(self.size.width / 2.0f, kShipSize.height/2.0f); [self addChild:ship]; } -(SKNode*)makeShip { SKNode* ship = [SKSpriteNode spriteNodeWithColor:[SKColor greenColor] size:kShipSize]; ship.name = kShipName; return ship; } -(void)setupHud { //Sets the score label font to Courier SKLabelNode* scoreLabel = [SKLabelNode labelNodeWithFontNamed:@"Courier"]; //1 - Give the score label a name so it becomes easy to find later when // the score needs to be updated. scoreLabel.name = kScoreHudName; scoreLabel.fontSize = 15; //2 - Color the score label green scoreLabel.fontColor = [SKColor greenColor]; scoreLabel.text = [NSString stringWithFormat:@"Score: %04u", 0]; //3 - Positions the score label near the top left corner of the screen scoreLabel.position = CGPointMake(20 + scoreLabel.frame.size.width/2, self.size.height - (20 + scoreLabel.frame.size.height/2)); [self addChild:scoreLabel]; //Applies the font of the health label SKLabelNode* healthLabel = [SKLabelNode labelNodeWithFontNamed:@"Courier"]; //4 - Give the health label a name so it can be referenced later when it needs // to be updated to display the health healthLabel.name = kHealthHudName; healthLabel.fontSize = 15; //5 - Colors the health label red healthLabel.fontColor = [SKColor redColor]; healthLabel.text = [NSString stringWithFormat:@"Health: %.1f%%", 100.0f]; //6 - Positions the health Label on the upper right hand side of the screen healthLabel.position = CGPointMake(self.size.width - healthLabel.frame.size.width/2 - 20, self.size.height - (20 + healthLabel.frame.size.height/2)); [self addChild:healthLabel]; } #pragma mark - Scene Update - (void)update:(NSTimeInterval)currentTime { //Makes the invaders move [self moveInvadersForUpdate:currentTime]; } #pragma mark - Scene Update Helpers //This method will get invoked by update -(void)moveInvadersForUpdate:(NSTimeInterval)currentTime { //1 - if it's not yet time to move, exit the method. moveInvadersForUpdate: // is invoked 60 times per second, but you don't want the invaders to move // that often since the movement would be too fast to see if (currentTime - self.timeOfLastMove < self.timePerMove) return; //2 - Recall that the scene holds all the invaders as child nodes; which were // added to the scene using addChild: in setupInvaders identifying each invader // by its name property. Invoking enumerateChildNodesWithName:usingBlock only loops over the invaders because they're named kInvaderType; which makes the loop skip the ship and the HUD. The guts og the block moves the invaders 10 pixels either right, left or down depending on the value of invaderMovementDirection [self enumerateChildNodesWithName:kInvaderName usingBlock:^(SKNode *node, BOOL *stop) { switch (self.invaderMovementDirection) { case InvaderMovementDirectionRight: node.position = CGPointMake(node.position.x - 10, node.position.y); break; case InvaderMovementDirectionLeft: node.position = CGPointMake(node.position.x - 10, node.position.y); break; case InvaderMovementDirectionDownThenLeft: case InvaderMovementDirectionDownThenRight: node.position = CGPointMake(node.position.x, node.position.y - 10); break; InvaderMovementDirectionNone: default: break; } }]; //3 - Record that you just moved the invaders, so that the next time this method is invoked (1/60th of a second from when it starts), the invaders won't move again until the set time period of one second has elapsed. self.timeOfLastMove = currentTime; //Makes it so that the invader movement direction changes only when the invaders are actually moving. Invaders only move when the check on self.timeOfLastMove passes (when conditional expression is true) [self determineInvaderMovementDirection]; } #pragma mark - Invader Movement Helpers -(void)determineInvaderMovementDirection { //1 - Since local vars accessed by block are default const(means they cannot be changed), this snippet of code qualifies proposedMovementDirection with __block so that you can modify it in //2 __block InvaderMovementDirection proposedMovementDirection = self.invaderMovementDirection; //2 - Loops over the invaders in the scene and refers to the block with the invader as an argument [self enumerateChildNodesWithName:kInvaderName usingBlock:^(SKNode *node, BOOL *stop) { switch (self.invaderMovementDirection) { case InvaderMovementDirectionRight: //3 - If the invader's right edge is within 1pt of the right edge of the scene, it's about to move offscreen. Sets proposedMovementDirection so that the invaders move down then left. You compare the invader's frame(the frame that contains its content in the scene's coordinate system) with the scene width. Since the scene has an anchorPoint of (0,0) by default and is scaled to fill it's parent view, this comparison ensures you're testing against the view's edges. if (CGRectGetMaxX(node.frame) >= node.scene.size.width - 1.0f) { proposedMovementDirection = InvaderMovementDirectionDownThenLeft; *stop = YES; } break; case InvaderMovementDirectionLeft: //4 - If the invader's left edge is within 1 pt of the left edge of the scene, it's about to move offscreen. Sets the proposedMovementDirection so invaders move down then right if (CGRectGetMinX(node.frame) <= 1.0f) { proposedMovementDirection = InvaderMovementDirectionDownThenRight; *stop = YES; } break; case InvaderMovementDirectionDownThenLeft: //5 - If invaders are moving down then left, they already moved down at this point, so they should now move left. proposedMovementDirection = InvaderMovementDirectionLeft; *stop = YES; break; case InvaderMovementDirectionDownThenRight: //6 - if the invaders are moving down then right, they already moved down so they should now move right. proposedMovementDirection = InvaderMovementDirectionRight; *stop = YES; break; default: break; } }]; //7 - if the proposed invader movement direction is different than the current invader movement direction, update the current direction to the proposed direction if (proposedMovementDirection != self.invaderMovementDirection) { self.invaderMovementDirection = proposedMovementDirection; } } #pragma mark - Bullet Helpers #pragma mark - User Tap Helpers #pragma mark - HUD Helpers #pragma mark - Physics Contact Helpers #pragma mark - Game End Helpers @end

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• Integrating WIF with WCF Data Services

  - by cibrax

  A time ago I discussed how a custom REST Starter kit interceptor could be used to parse a SAML token in the Http Authorization header and wrap that into a ClaimsPrincipal that the WCF services could use. The thing is that code was initially created for Geneva framework, so it got deprecated quickly. I recently needed that piece of code for one of projects where I am currently working on so I decided to update it for WIF. As this interceptor can be injected in any host for WCF REST services, also represents an excellent solution for integrating claim-based security into WCF Data Services (previously known as ADO.NET Data Services). The interceptor basically expects a SAML token in the Authorization header. If a token is found, it is parsed and a new ClaimsPrincipal is initialized and injected in the WCF authorization context. public class SamlAuthenticationInterceptor : RequestInterceptor {   SecurityTokenHandlerCollection handlers;   public SamlAuthenticationInterceptor()     : base(false)   {     this.handlers = FederatedAuthentication.ServiceConfiguration.SecurityTokenHandlers;   }   public override void ProcessRequest(ref RequestContext requestContext)   {     SecurityToken token = ExtractCredentials(requestContext.RequestMessage);     if (token != null)     {       ClaimsIdentityCollection claims = handlers.ValidateToken(token);       var principal = new ClaimsPrincipal(claims);       InitializeSecurityContext(requestContext.RequestMessage, principal);     }     else     {       DenyAccess(ref requestContext);     }   }   private void DenyAccess(ref RequestContext requestContext)   {     Message reply = Message.CreateMessage(MessageVersion.None, null);     HttpResponseMessageProperty responseProperty = new HttpResponseMessageProperty() { StatusCode = HttpStatusCode.Unauthorized };     responseProperty.Headers.Add("WWW-Authenticate",           String.Format("Basic realm=\"{0}\"", ""));     reply.Properties[HttpResponseMessageProperty.Name] = responseProperty;     requestContext.Reply(reply);     requestContext = null;   }   private SecurityToken ExtractCredentials(Message requestMessage)   {     HttpRequestMessageProperty request = (HttpRequestMessageProperty)  requestMessage.Properties[HttpRequestMessageProperty.Name];     string authHeader = request.Headers["Authorization"];     if (authHeader != null && authHeader.Contains("<saml"))     {       XmlTextReader xmlReader = new XmlTextReader(new StringReader(authHeader));       var col = SecurityTokenHandlerCollection.CreateDefaultSecurityTokenHandlerCollection();       SecurityToken token = col.ReadToken(xmlReader);                                        return token;     }     return null;   }   private void InitializeSecurityContext(Message request, IPrincipal principal)   {     List<IAuthorizationPolicy> policies = new List<IAuthorizationPolicy>();     policies.Add(new PrincipalAuthorizationPolicy(principal));     ServiceSecurityContext securityContext = new ServiceSecurityContext(policies.AsReadOnly());     if (request.Properties.Security != null)     {       request.Properties.Security.ServiceSecurityContext = securityContext;     }     else     {       request.Properties.Security = new SecurityMessageProperty() { ServiceSecurityContext = securityContext };      }    }    class PrincipalAuthorizationPolicy : IAuthorizationPolicy    {      string id = Guid.NewGuid().ToString();      IPrincipal user;      public PrincipalAuthorizationPolicy(IPrincipal user)      {        this.user = user;      }      public ClaimSet Issuer      {        get { return ClaimSet.System; }      }      public string Id      {        get { return this.id; }      }      public bool Evaluate(EvaluationContext evaluationContext, ref object state)      {        evaluationContext.AddClaimSet(this, new DefaultClaimSet(System.IdentityModel.Claims.Claim.CreateNameClaim(user.Identity.Name)));        evaluationContext.Properties["Identities"] = new List<IIdentity>(new IIdentity[] { user.Identity });        evaluationContext.Properties["Principal"] = user;        return true;      }    } A WCF Data Service, as any other WCF Service, contains a service host where this interceptor can be injected. The following code illustrates how that can be done in the “svc” file. <%@ ServiceHost Language="C#" Debug="true" Service="ContactsDataService"                 Factory="AppServiceHostFactory" %> using System; using System.ServiceModel; using System.ServiceModel.Activation; using Microsoft.ServiceModel.Web; class AppServiceHostFactory : ServiceHostFactory {    protected override ServiceHost CreateServiceHost(Type serviceType, Uri[] baseAddresses)   {     WebServiceHost2 result = new WebServiceHost2(serviceType, true, baseAddresses);     result.Interceptors.Add(new SamlAuthenticationInterceptor());                 return result;   } } WCF Data Services includes an specific WCF host of out the box (DataServiceHost). However, the service is not affected at all if you replace it with a custom one as I am doing in the code above (WebServiceHost2 is part of the REST Starter kit). Finally, the client application needs to pass the SAML token somehow to the data service. In case you are using any Http client library for consuming the data service, that’s easy to do, you only need to include the SAML token as part of the “Authorization” header. If you are using the auto-generated data service proxy, a little piece of code is needed to inject a SAML token into the DataServiceContext instance. That class provides an event “SendingRequest” that any client application can leverage to include custom code that modified the Http request before it is sent to the service. So, you can easily create an extension method for the DataServiceContext that negotiates the SAML token with an existing STS, and adds that token as part of the “Authorization” header. public static class DataServiceContextExtensions {        public static void ConfigureFederatedCredentials(this DataServiceContext context, string baseStsAddress, string realm)   {     string address = string.Format(STSAddressFormat, baseStsAddress, realm);                  string token = NegotiateSecurityToken(address);     context.SendingRequest += (source, args) =>     {       args.RequestHeaders.Add("Authorization", token);     };   } private string NegotiateSecurityToken(string address) { } } I left the NegociateSecurityToken method empty for this extension as it depends pretty much on how you are negotiating tokens from an existing STS. In case you want to end-to-end REST solution that involves an Http endpoint for the STS, you should definitely take a look at the Thinktecture starter STS project in codeplex.

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• Resolving "PLS-00201: identifier 'DBMS_SYSTEM.XXXX' must be declared" Error

  - by Giri Mandalika

  Here is a failure sample. SQL set serveroutput on SQL alter package APPS.FND_TRACE compile body; Warning: Package Body altered with compilation errors. SQL show errors Errors for PACKAGE BODY APPS.FND_TRACE: LINE/COL ERROR -------- ----------------------------------------------------------------- 235/6 PL/SQL: Statement ignored 235/6 PLS-00201: identifier 'DBMS_SYSTEM.SET_EV' must be declared .. By default, DBMS_SYSTEM package is accessible only from SYS schema. Also there is no public synonym created for this package. So, the solution is to create the public synonym and grant "execute" privilege on DBMS_SYSTEM package to all database users or a specific user. eg., SQL CREATE PUBLIC SYNONYM dbms_system FOR dbms_system; Synonym created. SQL GRANT EXECUTE ON dbms_system TO APPS; Grant succeeded. - OR - SQL GRANT EXECUTE ON dbms_system TO PUBLIC; Grant succeeded. SQL alter package APPS.FND_TRACE compile body; Package body altered. Note that merely granting execute privilege is not enough -- creating the public synonym is as important to resolve this issue.

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• Binding Super+C Super+V to Copy and Paste

  - by solo

  For some time I've been interested in binding the Windows Key (Super_L) on my keyboard to Copy and Paste for no other reason but convenience and consistency between my desktop and my MacBook. I thought that I was close after reading about xmodmap and executing the following: $ # re-map Super_L to Mode_switch, the 3rd col in keymap table `xmodmap -pke` $ xmodmap -e "keycode 133 = Mode_switch" $ # map Mode_switch+c to copy $ xmodmap -e "keycode 54 = c C XF86_Copy C" $ # map Mode_switch+v to paste $ xmodmap -e "keycode 55 = v V XF86_Paste V" Unfortunately, XF86Copy and XF86Paste don't seem to work, at all. They are listed in /usr/include/X11/XF86keysym.h and xev shows that the key sequence is being interpreted by X as XF86Paste and XF86Copy, do these symbols actually work? Do they have to have application level support?

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• Felix Baumgartner Skydives from the Edge of Space [Video]

  - by Jason Fitzpatrick

  Yesterday Felix Baumgartner broke the record for highest skydive by leaping out of a capsule 128,100 feet above the Earth. Check out his jump in the following videos. After flying to an altitude of 39,045 meters (128,100 feet) in a helium-filled balloon, Felix Baumgartner completed a record breaking jump for the ages from the edge of space, exactly 65 years after Chuck Yeager first broke the sound barrier flying in an experimental rocket-powered airplane. Felix reached a maximum of speed of 1,342.8 km/h (833mph) through the near vacuum of the stratosphere before being slowed by the atmosphere later during his 4:20 minute long freefall. The 43-year-old Austrian skydiving expert also broke two other world records (highest freefall, highest manned balloon flight), leaving the one for the longest freefall to project mentor Col. Joe Kittinger. The above video is a 2 minute highlight reel of the ascent and jump; check out the full 15 minute descent video here. For an in-depth look at the technology used to keep Baumgartner safe during his record setting journey, hit up the link below. The Tech Behind Felix Baumgartner’s Stratospheric Skydive [ExtremeTech] HTG Explains: What is the Windows Page File and Should You Disable It? How To Get a Better Wireless Signal and Reduce Wireless Network Interference How To Troubleshoot Internet Connection Problems

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• How to create a text file from column and FTP that text file to server

  - by addi

  I have workbook with 2 sheets (Sheet1 and sheet2). On sheet1 user will enter the data which will be populated in the column B and then column C will hold the values from Col A and B on sheet2. I need to create a text file from the values in coloumn C on a click of a button and then upload(FTP) that file to a server. So the sheet1 will have 2 buttons. Button1 will save the excel file and create the text file in windows temp directory. e.g text.xls text.prop (text file whoch has all the values in column C on sheet2) Button2 will upload (FTP) the text file (.prop) to a server. Can anyone please send me the steps and VB code to achieve the above tasks? Thanks in Advance Addi

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• Do you play Sudoku ?

  - by Gilles Haro

  Did you know that 11gR2 database could solve a Sudoku puzzle with a single query and, most of the time, and this in less than a second ? The following query shows you how ! Simply pass a flattened Sudoku grid to it a get the result instantaneously ! col "Solution" format a9 col "Problem" format a9 with Iteration( initialSudoku, Step, EmptyPosition ) as ( select initialSudoku, InitialSudoku, instr( InitialSudoku, '-' )        from ( select '--64----2--7-35--1--58-----27---3--4---------4--2---96-----27--7--58-6--3----18--' InitialSudoku from dual )    union all    select initialSudoku        , substr( Step, 1, EmptyPosition - 1 ) || OneDigit || substr( Step, EmptyPosition + 1 )         , instr( Step, '-', EmptyPosition + 1 )      from Iteration         , ( select to_char( rownum ) OneDigit from dual connect by rownum <= 9 ) OneDigit     where EmptyPosition > 0       and not exists          ( select null              from ( select rownum IsPossible from dual connect by rownum <= 9 )             where OneDigit = substr( Step, trunc( ( EmptyPosition - 1 ) / 9 ) * 9 + IsPossible, 1 )   -- One line must contain the 1-9 digits                or OneDigit = substr( Step, mod( EmptyPosition - 1, 9 ) - 8 + IsPossible * 9, 1 )      -- One row must contain the 1-9 digits                or OneDigit = substr( Step, mod( trunc( ( EmptyPosition - 1 ) / 3 ), 3 ) * 3           -- One square must contain the 1-9 digits                            + trunc( ( EmptyPosition - 1 ) / 27 ) * 27 + IsPossible                            + trunc( ( IsPossible - 1 ) / 3 ) * 6 , 1 )          ) ) select initialSudoku "Problem", Step "Solution"    from Iteration  where EmptyPosition = 0 ;   The Magic thing behind this is called Recursive Subquery Factoring. The Oracle documentation gives the following definition: If a subquery_factoring_clause refers to its own query_name in the subquery that defines it, then the subquery_factoring_clause is said to be recursive. A recursive subquery_factoring_clause must contain two query blocks: the first is the anchor member and the second is the recursive member. The anchor member must appear before the recursive member, and it cannot reference query_name. The anchor member can be composed of one or more query blocks combined by the set operators: UNION ALL, UNION, INTERSECT or MINUS. The recursive member must follow the anchor member and must reference query_name exactly once. You must combine the recursive member with the anchor member using the UNION ALL set operator. This new feature is a replacement of this old Hierarchical Query feature that exists in Oracle since the days of Aladdin (well, at least, release 2 of the database in 1977). Everyone remembers the old syntax : select empno, ename, job, mgr, level      from   emp      start with mgr is null      connect by prior empno = mgr; that could/should be rewritten (but not as often as it should) as withT_Emp (empno, name, level) as        ( select empno, ename, job, mgr, level             from   emp             start with mgr is null             connect by prior empno = mgr        ) select * from   T_Emp; which uses the "with" syntax, whose main advantage is to clarify the readability of the query. Although very efficient, this syntax had the disadvantage of being a Non-Ansi Sql Syntax. Ansi-Sql version of Hierarchical Query is called Recursive Subquery Factoring. As of 11gR2, Oracle got compliant with Ansi Sql and introduced Recursive Subquery Factoring. It is basically an extension of the "With" clause that enables recursion. Now, the new syntax for the query would be with T_Emp (empno, name, job, mgr, hierlevel) as       ( select E.empno, E.ename, E.job, E.mgr, 1 from emp E where E.mgr is null         union all         select E.empno, E.ename, E.job, E.mgr, T.hierlevel + 1from emp E                                                                                                            join T_Emp T on ( E.mgr = T.empno ) ) select * from   T_Emp; The anchor member is a replacement for the "start with" The recursive member is processed through iterations. It joins the Source table (EMP) with the result from the Recursive Query itself (T_Emp) Each iteration works with the results of all its preceding iterations.     Iteration 1 works on the results of the first query     Iteration 2 works on the results of Iteration 1 and first query     Iteration 3 works on the results of Iteration 1, Iteration 2 and first query. So, knowing that, the Sudoku query it self-explaining; The anchor member contains the "Problem" : The Initial Sudoku and the Position of the first "hole" in the grid. The recursive member tries to replace the considered hole with any of the 9 digit that would satisfy the 3 rules of sudoku Recursion progress through the grid until it is complete.   Another example :  Fibonaccy Numbers :  un = (un-1) + (un-2) with Fib (u1, u2, depth) as   (select 1, 1, 1 from dual    union all    select u1+u2, u1, depth+1 from Fib where depth<10) select u1 from Fib; Conclusion Oracle brings here a new feature (which, to be honest, already existed on other concurrent systems) and extends the power of the database to new boundaries. It’s now up to developers to try and test it and find more useful application than solving puzzles… But still, solving a Sudoku in less time it takes to say it remains impressive… Interesting links: You might be interested by the following links which cover different aspects of this feature Oracle Documentation Lucas Jellema 's Blog Fibonaci Numbers

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• CodePlex Daily Summary for Thursday, June 13, 2013

  CodePlex Daily Summary for Thursday, June 13, 2013Popular ReleasesBrightstarDB: BrightstarDB 1.3.40613: This is the first "official" BrightstarDB release under the MIT open source license. The code base has been reworked to replace / remove the use of third-party closed-source tools and has been updated to use a patched version of dotNetRDF 1.0 that includes the most recent updates for SPARQL 1.1 and Turtle. We have also extended the core RDF API to support targeting a specific graph with an update or query operation and made a change to the core profiling code to disable it by default, leadin...Lakana - WPF Framework: Lakana V2.1 RTM: - Dynamic text localization - A new application wide message busPokemon Battle Online: ETV: ETV???2012?12??????，????。 ???? Server??????，?????。 ?????????，?????????????，?????????。 ????????，????，?????????，???????????（??）??。 ???????180?，??????????TimeUp?18000?，???????????????????????。 ???? ????????????。 ???????。 ???PP????，????????????????????PP????，??3。 ?????????????，??????????。 ???????? ??? ?? ???? ??? ???? ?? ?????????? ?? ??? ??? ??? ???????? ???? ???? ???????????????、???????????，??“???????”??。 ???bug ???Web Pages CMS: 0.5.0.5: Added empty media directoryModern UI for WPF: Modern UI 1.0.4: The ModernUI assembly including a demo app demonstrating the various features of Modern UI for WPF. Related downloads NuGet ModernUI for WPF is also available as NuGet package in the NuGet gallery, id: ModernUI.WPF Download Modern UI for WPF Templates A Visual Studio 2012 extension containing a collection of project and item templates for Modern UI for WPF. The extension includes the ModernUI.WPF NuGet package. DownloadToolbox for Dynamics CRM 2011: XrmToolBox (v1.2013.6.11): XrmToolbox improvement Add exception handling when loading plugins Updated information panel for displaying two lines of text Tools improvementMetadata Document Generator (v1.2013.6.10)New tool Web Resources Manager (v1.2013.6.11)Retrieve list of unused web resources Retrieve web resources from a solution All tools listAccess Checker (v1.2013.2.5) Attribute Bulk Updater (v1.2013.1.17) FetchXml Tester (v1.2013.3.4) Iconator (v1.2013.1.17) Metadata Document Generator (v1.2013.6.10) Privilege...Document.Editor: 2013.23: What's new for Document.Editor 2013.23: New Insert Emoticon support Improved Format support Minor Bug Fix's, improvements and speed upsChristoc's DotNetNuke Module Development Template: DotNetNuke 7 Project Templates V2.4 for VS2012: V2.4 - Release Date 6/10/2013 Items addressed in this 2.4 release Updated MSBuild Community Tasks reference to 1.4.0.61 Setting up your DotNetNuke Module Development Environment Installing Christoc's DotNetNuke Module Development Templates Customizing the latest DotNetNuke Module Development Project TemplatesLayered Architecture Sample for .NET: Leave Sample - June 2013 (for .NET 4.5): Thank You for downloading Layered Architecture Sample. Please read the accompanying README.txt file for setup and installation instructions. This is the first set of a series of revised samples that will be released to illustrate the layered architecture design pattern. This version is only supported on Visual Studio 2012. This samples illustrates the use of ASP.NET Web Forms, ASP.NET Model Binding, Windows Communications Foundation (WCF), Windows Workflow Foundation (WF) and Microsoft Ente...Papercut: Papercut 2013-6-10: Feature: Shows From, To, Date and Subject of Email. Feature: Async UI and loading spinner. Enhancement: Improved speed when loading large attachments. Enhancement: Decoupled SMTP server into secondary assembly. Enhancement: Upgraded to .NET v4. Fix: Messages lost when received very fast. Fix: Email encoding issues on display/Automatically detect message Encoding Installation Note:Installation is copy and paste. Incoming messages are written to the start-up directory of Papercut. If you do n...Supporting Guidance and Whitepapers: v1.BETA Unit test Generator Documentation: Welcome to the Unit Test Generator Once you’ve moved to Visual Studio 2012, what’s a dev to do without the Create Unit Tests feature? Based on the high demand on User Voice for this feature to be restored, the Visual Studio ALM Rangers have introduced the Unit Test Generator Visual Studio Extension. The extension adds the “create unit test” feature back, with a focus on automating project creation, adding references and generating stubs, extensibility, and targeting of multiple test framewor...SFDL.NET: SFDL.NET v1.1.0.4: Changelog: Ciritical Bug Fixed : Downloading of Files not possibleMapWinGIS ActiveX Map and GIS Component: MapWinGIS v4.8.8 Release Candidate - 32 Bit: This is the first release candidate of MapWinGIS. Please test it thoroughly.MapWindow 4: MapWindow GIS v4.8.8 - Release Candidate - 32Bit: Download the release notes here: http://svn.mapwindow.org/svnroot/MapWindow4Dev/Bin/MapWindowNotes.rtfLINQ to Twitter: LINQ to Twitter v2.1.06: Supports .NET 3.5, .NET 4.0, .NET 4.5, Silverlight 4.0, Windows Phone 7.1, Windows Phone 8, Client Profile, Windows 8, and Windows Azure. 100% Twitter API coverage. Also supports Twitter API v1.1! Also on NuGet.SimCityPak: SimCityPak 0.1.0.8: SimCityPak 0.1.0.8 New features: Import BMP color palettes for vehicles Import RASTER file (uncompressed 8.8.8.8 DDS files) View different channels of RASTER files or preview of all layers combined Find text in javascripts TGA viewer Ground textures added to lot editor Many additional identified instances and propertiesWsus Package Publisher: Release v1.2.1306.09: Add more verifications on certificate validation. WPP will not let user to try publishing an update until the certificate is valid. Add certificate expiration date on the 'About' form. Filter Approbation to avoid a user to try to approve an update for uninstallation when the update do not support uninstallation. Add the server and console version on the 'About' form. WPP will not let user to publish an update until the server and console are not at the same level. WPP do not let user ...AJAX Control Toolkit: June 2013 Release: AJAX Control Toolkit Release Notes - June 2013 Release Version 7.0607June 2013 release of the AJAX Control Toolkit. AJAX Control Toolkit .NET 4.5 – AJAX Control Toolkit for .NET 4.5 and sample site (Recommended). AJAX Control Toolkit .NET 4 – AJAX Control Toolkit for .NET 4 and sample site (Recommended). AJAX Control Toolkit .NET 3.5 – AJAX Control Toolkit for .NET 3.5 and sample site (Recommended). Notes: - Instructions for using the AJAX Control Toolkit with ASP.NET 4.5 can be found at...Rawr: Rawr 5.2.1: This is the Downloadable WPF version of Rawr!For web-based version see http://elitistjerks.com/rawr.php You can find the version notes at: http://rawr.codeplex.com/wikipage?title=VersionNotes Rawr Addon (NOT UPDATED YET FOR MOP)We now have a Rawr Official Addon for in-game exporting and importing of character data hosted on Curse. The Addon does not perform calculations like Rawr, it simply shows your exported Rawr data in wow tooltips and lets you export your character to Rawr (including ba...Json.NET: Json.NET 5.0 Release 6: New feature - Added serialized/deserialized JSON to verbose tracing New feature - Added support for using type name handling with ISerializable content Fix - Fixed not using default serializer settings with primitive values and JToken.ToObject Fix - Fixed error writing BigIntegers with JsonWriter.WriteToken Fix - Fixed serializing and deserializing flag enums with EnumMember attribute Fix - Fixed error deserializing interfaces with a valid type converter Fix - Fixed error deser...New Projects.NET Code Migrator for Dynamics CRM: This project is designed to assist the .NET developer who is migrating their C# code from the CRM 4.0 object model to the CRM 2011 object model.ChronoScript: Programming languageColaBBS: ColaBBS for .NET FrameworkColly: Project for Col col wayFIOCaseRU: ?????? ?????????? ??? ????????? ??? ?? ??????? ?? ??????? ?????.Java Jos - Learning Javanese ( Bahasa Jawa ) with Fun !: Java Jos, a learning Javanese application aims to help kids 7-12 years old learn Javanese character as well as enrich their cultural experienceJavaScript PersianDatePicker: A lightweight (3.5 kb) javascript persian date picker that shows server date.NOH-I Webapplicaties 2013 - Quaack groep 2: Study-projectPrimeLand Accounting: Sistem Informasi Akunting PT Prime Land SemarangPuffy: Project for puf puf ga meSIOGDE: Only test, not to download. This software is not stableTask Manager DNN: Projecto teste, DNN Task Manager video series.TinCan.NET: Using the TinCan specifications, this C# MVC project attempts to provide endpoints for TinCan compliant clients. wBudget: wBudget is a simple budgeting app for windows 8 developed for learning purposes by students.Windows 8 App Design Reference Template: Education Guide: Education Guide template will help if you want to build an app which has the following sections a. Tutorials b. Subjects c. Section in each subject Windows 8 App Design Reference Template: Magazine: Magazine Template will help if you want to build an app which has the following ingredients a. Current Section b. Articles c. Articles details Windows 8 App Design Reference Template: Music and video: Music and Video Template will help if you want to build an app which has place holders for Featured Songs,Top Music,Top Movies, Lyrics section etc.Windows 8 App Design Reference Template: Music Zone: Music Zone Template will help if you want to build an app which has the following ingredients a. Top Songs b. Top Albums c. Genre d. Playlists e. Latest Added Windows 8 App Design Reference Template: Trekking Planner: Trekking Planner template will help if you want to build an app which has the following sections a. Booking Options b. Packages c. Area Details

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• SharePoint 2010 PowerShell Script to Find All SPShellAdmins with Database Name

  - by Brian Jackett

  Problem     Yesterday on Twitter my friend @cacallahan asked for some help on how she could get all SharePoint 2010 SPShellAdmin users and the associated database name.  I spent a few minutes and wrote up a script that gets this information and decided I’d post it here for others to enjoy.     Background     The Get-SPShellAdmin commandlet returns a listing of SPShellAdmins for the given database Id you pass in, or the farm configuration database by default.  For those unfamiliar, SPShellAdmin access is necessary for non-admin users to run PowerShell commands against a SharePoint 2010 farm (content and configuration databases specifically).  Click here to read an excellent guest post article my friend John Ferringer (twitter) wrote on the Hey Scripting Guy! blog regarding granting SPShellAdmin access.  Solution     Below is the script I wrote (formatted for space and to include comments) to provide the information needed. Click here to download the script.   # declare a hashtable to store results $results = @{}   # fetch databases (only configuration and content DBs are needed) $databasesToQuery = Get-SPDatabase | Where {$_.Type -eq 'Configuration Database' -or $_.Type -eq 'Content Database'}   # for each database get spshelladmins and add db name and username to result $databasesToQuery | ForEach-Object {$dbName = $_.Name; Get-SPShellAdmin -database $_.id | ForEach-Object {$results.Add($dbName, $_.username)}}   # sort results by db name and pipe to table with auto sizing of col width $results.GetEnumerator() | Sort-Object -Property Name | ft -AutoSize     Conclusion     In this post I provided a script that outputs all of the SPShellAdmin users and the associated database names in a SharePoint 2010 farm.  Funny enough it actually took me longer to boot up my dev VM and PowerShell (~3 mins) than it did to write the first working draft of the script (~2 mins).  Feel free to use this script and modify as needed, just be sure to give credit back to the original author.  Let me know if you have any questions or comments.  Enjoy!         -Frog Out   Links PowerShell Hashtables http://technet.microsoft.com/en-us/library/ee692803.aspx SPShellAdmin Access Explained http://blogs.technet.com/b/heyscriptingguy/archive/2010/07/06/hey-scripting-guy-tell-me-about-permissions-for-using-windows-powershell-2-0-cmdlets-with-sharepoint-2010.aspx

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• Big level objects collision system for 2d game

  - by Aristarhys

  I read many variants today and get some knowledge in general, so here is a steps of mine thoughts in pictures (horrible paint.net ones). We need to develop grid system, so we check only thing near, perform simple check to cut out deep check, and at - last deep check like per-pixel collision check. Step 1 - Let p1, p2 are some sprites lets first just check with circle collision - because large distance between p1, p2 this fails and of course so we don't need test more deeply. But if we have not 2, but 20 objects, why we need to even circle test something so far outside of our view. Step 2 - Add basic column system, now we don't bother with p2 if it's in a column far from p1 column, so we even don't do circle test. But p3 is in the same col, so let do circle test, which of course will fail. Step 3 - Lets improve column system to the grid system with grid cell size just like p1, p2, p3 collision boxes, so we cut out things much top or below p1. And this is all great until comes BIG OBJs which is some kind of platforms. They are much bigger then grid cell. Circle test for will be successful, but deep check for whole big obj will fail And that the part I can't get. How do I store the grid position of big object? Like 4 grid coords for big object vertexes? And if one of them close to p1 do circle check for centre of big object then a deep one if succeed? Am I do it wrong? My possible solution:

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• Location Change Salary Differences [closed]

  - by GameDev

  DISCLAIMER: I know that this might be a "regional" question but I'm also asking for help as far as what resources to use to determine my decision. I'm currently talking to a recruiter for a game developer in the SF Bay area. I work in a relatively low-cost area in the south. I really want to get into game development but my current career is general web development. I'm very interested in taking the job, but my concern is that the amount they're willing to pay might be a relative pay cut. Here are some factors: It's not an entry-level position, the title is Senior Software Engineer. I have 5+ years of experience. The calculators online tell me that I should be expecting around 2x my current pay rate(http://www.bestplaces.net/col/). My current pay is in the mid $60k/yr, so that's like 120-130k. The recruiter told me at my experience level I can expect about $90-100/yr, and that those cost of living calculators were way off. The benefits will definitely be better, it's much larger company (help with commuting, catered meals, etc). But is the recruiter trying to give me a snow job on the pay scale, or is that a reasonable change from a smallish town in the south to somewhere in the SF bay area? How can I find this out? Glassdoor and Payscale seem to say "senior software developers" in that area make around 110 in median salary, but Payscale says it's closer to $135k, that range seems pretty large.

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• Cant Add Columns to a AD Task pad except for the top level of the domain

  - by Darktux

  We are working on Active Directory taskpads application for user management in our organization and facing stange issue. When we create a taskpad, and when we are at top level of the domain, i can click view - Add/Remove Columns and add "Pre Windows Name" (and lots of other properties) to the taskpad as columns, but when i just go 1 level down , i can only see "Operating System" and "Service Pack" ; why is it happening , isnt "Domain Admins" supposed to god access to all the things in AD domain , atleast of objects they own? It is important to have "Pre Windows 2000" Name as a column begause with out that our "Shell Command" task wont show up in taskpads, since its bound to parameter "Col<9" (which is pre qindows name). Please do let me know if any additions questions to clarify my problem.

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• Add collection or array to wpf resource dictionary

  - by Chris Cap

  I've search high and low and can't find an answer to this. I have two questions How do you create an array or collection in XAML. I've got an array I want to stick in there and bind to a combo box. My first idea was to put an ItemsControl in a resource dictionary, but the ItemsSource of a combo box expects IEnumerable so that didn't work. Here's what I've tried in my resource dictionary and neither works <ItemsControl x:Key="stateList"> <sys:String>AL</sys:String> <sys:String>CA</sys:String> <sys:String>CN</sys:String> </ItemsControl> <ItemsControl x:Key="stateList2"> <ComboBoxItem>AL</ComboBoxItem> <ComboBoxItem>CA</ComboBoxItem> <ComboBoxItem>CN</ComboBoxItem> </ItemsControl> and here's how I bind to it <ComboBox SelectedValue="{Binding Path=State}" ItemsSource="{Binding Source={StaticResource stateList2}}" > </ComboBox> EDIT: UPDATED I got this first part to work this way <col:ArrayList x:Key="stateList3"> <sys:String>AL</sys:String> <sys:String>CA</sys:String> <sys:String>CN</sys:String> </col:ArrayList> However, I'd rather not use an array list, I'd like to use a generic list so if anyone knows how please let me know. EDIT UPDATE: I guess XAML has very limited support for generics so maybe an array list is the best I can do for now, but I would still like help on the second question if anyone has an anser 2nd. I've tried referencing a merged resource dictionary in my XAML and had problems because under Window.resources I had more than just the dictionary so it required me to add x:Key. Once I add the key, the system can no longer find the items in my resource dictionary. I had to move the merged dictionary to Grid.Resources instead. Ideally I'd like to reference the merged dictionary in the app.xaml but I have the same problem Here's some sample code. This first part required an x:key to compile because I have converter and it complained that every item must have a key if there is more than one <UserControl.Resources> <win:BooleanToVisibilityConverter x:Key="VisibilityConverter" /> <ResourceDictionary> <ResourceDictionary.MergedDictionaries> <ResourceDictionary Source="/ResourcesD.xaml" /> </ResourceDictionary.MergedDictionaries> </ResourceDictionary> </UserControl.Resources> I had to change it to this <UI:BaseStep.Resources> <win:BooleanToVisibilityConverter x:Key="VisibilityConverter" /> </UI:BaseStep.Resources> <Grid> <Grid.Resources> <ResourceDictionary> <ResourceDictionary.MergedDictionaries> <ResourceDictionary Source="/ResourcesD.xaml" /> </ResourceDictionary.MergedDictionaries> </ResourceDictionary> </Grid.Resources> </Grid> Thank you

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• "Content is not allowed in prolog" when parsing perfectly valid XML on GAE

  - by Adrian Petrescu

  Hey guys, I've been beating my head against this absolutely infuriating bug for the last 48 hours, so I thought I'd finally throw in the towel and try asking here before I throw my laptop out the window. I'm trying to parse the response XML from a call I made to AWS SimpleDB. The response is coming back on the wire just fine; for example, it may look like: <?xml version="1.0" encoding="utf-8"?> <ListDomainsResponse xmlns="http://sdb.amazonaws.com/doc/2009-04-15/"> <ListDomainsResult> <DomainName>Audio</DomainName> <DomainName>Course</DomainName> <DomainName>DocumentContents</DomainName> <DomainName>LectureSet</DomainName> <DomainName>MetaData</DomainName> <DomainName>Professors</DomainName> <DomainName>Tag</DomainName> </ListDomainsResult> <ResponseMetadata> <RequestId>42330b4a-e134-6aec-e62a-5869ac2b4575</RequestId> <BoxUsage>0.0000071759</BoxUsage> </ResponseMetadata> </ListDomainsResponse> I pass in this XML to a parser with XMLEventReader eventReader = xmlInputFactory.createXMLEventReader(response.getContent()); and call eventReader.nextEvent(); a bunch of times to get the data I want. Here's the bizarre part -- it works great inside the local server. The response comes in, I parse it, everyone's happy. The problem is that when I deploy the code to Google App Engine, the outgoing request still works, and the response XML seems 100% identical and correct to me, but the response fails to parse with the following exception: com.amazonaws.http.HttpClient handleResponse: Unable to unmarshall response (ParseError at [row,col]:[1,1] Message: Content is not allowed in prolog.): <?xml version="1.0" encoding="utf-8"?> <ListDomainsResponse xmlns="http://sdb.amazonaws.com/doc/2009-04-15/"><ListDomainsResult><DomainName>Audio</DomainName><DomainName>Course</DomainName><DomainName>DocumentContents</DomainName><DomainName>LectureSet</DomainName><DomainName>MetaData</DomainName><DomainName>Professors</DomainName><DomainName>Tag</DomainName></ListDomainsResult><ResponseMetadata><RequestId>42330b4a-e134-6aec-e62a-5869ac2b4575</RequestId><BoxUsage>0.0000071759</BoxUsage></ResponseMetadata></ListDomainsResponse> javax.xml.stream.XMLStreamException: ParseError at [row,col]:[1,1] Message: Content is not allowed in prolog. at com.sun.org.apache.xerces.internal.impl.XMLStreamReaderImpl.next(Unknown Source) at com.sun.xml.internal.stream.XMLEventReaderImpl.nextEvent(Unknown Source) at com.amazonaws.transform.StaxUnmarshallerContext.nextEvent(StaxUnmarshallerContext.java:153) ... (rest of lines omitted) I have double, triple, quadruple checked this XML for 'invisible characters' or non-UTF8 encoded characters, etc. I looked at it byte-by-byte in an array for byte-order-marks or something of that nature. Nothing; it passes every validation test I could throw at it. Even stranger, it happens if I use a Saxon-based parser as well -- but ONLY on GAE, it always works fine in my local environment. It makes it very hard to trace the code for problems when I can only run the debugger on an environment that works perfectly (I haven't found any good way to remotely debug on GAE). Nevertheless, using the primitive means I have, I've tried a million approaches including: XML with and without the prolog With and without newlines With and without the "encoding=" attribute in the prolog Both newline styles With and without the chunking information present in the HTTP stream And I've tried most of these in multiple combinations where it made sense they would interact -- nothing! I'm at my wit's end. Has anyone seen an issue like this before that can hopefully shed some light on it? Thanks!

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• Chaining CSS classes in IE6 - Trying to find a jQuery solution?

  - by Mike Baxter

  Right, perhaps I ask the impossible? I consider myself fairly new to Javscript and jQuery, but that being said, I have written some fairly complex code recently so I am definitely getting there... however I am now possed with a rather interesting issue at my current freelance contract. The previous web coder has taken a Grid-960 approach to the HTML and as a result has used chained classes to style many of the elements. The example below is typical of what can be found in the code: <div class='blocks four-col-1 orange highlight'>Some content</div> And in the css there will be different declarations for: (not actual css... but close enough) .blocks {margin-right:10px;} .orange {background-image:url(someimage.jpg);} .highlight {font-weight:bold;} .four-col-1 {width:300px;} and to make matters worse... this is in the CSS: .blocks.orange.highlight {background-colour:#dd00ff;} Anyone not familiar with this particular bug can read more on it here: http://www.ryanbrill.com/archives/multiple-classes-in-ie/ it is very real and very annoying. Without wanting to go into the merrits of not chaining classes (I told them this, but it is no longer feasible to change their approach... 100 hand coded pages into a 150 page website, no CMS... sigh) and without the luxury of being able to change the way these blocks are styled... can anyone advise me on the complexity and benefits between any of my below proposed approaches or possible other options that would adequately solve this problem. Potential Solution 1 Using conditional comments I am considering loading a jquery script only for IE6 that: Reads the class of all divs in a certain section of the page and pushes to an array creates empty boxes off screen with only one of the classes applied at a time Reads the applied CSS values for each box Re-applies these styles to the individual box, somehow bearing in mind the order in which they are called and overwriting conflicting instructions as required Potential Solution 2 read the class of all divs in a certain section of the page and push to an array Scan the document for links to style sheets Ajax grab the stylesheets and traverse looking for matching names to those in class array Apply styles as needed Potential Solution 3 Create an IE6 only stylesheet containing the exact style to be applied as a unique name (ie: class='blocks orange highlight' becomes class='blocks-orange-highlight') Traverse the document in IE6 and convert all spaces in class declarations to hyphens and reapply classes based on new style name Summary: Solution 1 allows the people at this company to apply any styles in the future and the script will adjust as needed. However it does not allow for the chained style to be added, only the individual style... it is also processor intensive and time consuming, but also the most likely to be converted into a plugin that could be used the world over Solution 2 is a potential nightmare to code. But again will allow for an endless number of updates without breaking Solution 3 will require someone at the companty to hardcode the new styles every time they make a change, and if they don't, IE6 will break. Ironically the site, whilst needing to conform to IE6 in a limited manner, does not need to run wihtout javascript (they've made the call... have JS or go away), so consider all jQuery and JS solutions to be 'game on'. Did I mention how much i hate IE6? Anyway... any thoughts or comments would be appreciated. I will continue to develop my own solution and if I discover one that can be turned into a jQuery plugin I will post it here in the comments. Regards, Mike.

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• Ajax - How refresh <DIV> after submit

  - by user107712

  Hi, How refresh part of page ("DIV") after my application release a submit? I'm use JQuery with plugin ajaxForm. I set my target with "divResult", but the page repeat your content inside the "divResult". Sources: $(document).ready(function() { $("#formSearch").submit(function() { var options = { target:"#divResult", url: "http://localhost:8081/sniper/estabelecimento/pesquisar.action" } $(this).ajaxSubmit(options); return false; }); }) Page ... ... <div id="divResult" class="quadro_conteudo" > <table id="tableResult" class="tablesorter"> <thead> <tr> <th style="text-align:center;"> <input id="checkTodos" type="checkbox" title="Marca/Desmarcar todos" /> </th> <th scope="col">Name</th> <th scope="col">Phone</th> </tr> </thead> <tbody> <s:iterator value="entityList"> <s:url id="urlEditar" action="editar"><s:param name="id" value="%{id}"/></s:url> <tr> <td style="text-align:center;"><s:checkbox id="checkSelecionado" name="selecionados" theme="simple" fieldValue="%{id}"></s:checkbox></td> <td> <s:a href="%{urlEditar}"><s:property value="name"/></s:a></td> <td> <s:a href="%{urlEditar}"><s:property value="phone"/></s:a></td> </tr> </s:iterator> </tbody> </table> <div id="pager" class="pager"> <form> <img src="<%=request.getContextPath()%>/plugins/jquery/tablesorter/addons/pager/icons/first.png" class="first"/> <img src="<%=request.getContextPath()%>/plugins/jquery/tablesorter/addons/pager/icons/prev.png" class="prev"/> <input type="text" class="pagedisplay"/> <img src="<%=request.getContextPath()%>/plugins/jquery/tablesorter/addons/pager/icons/next.png" class="next"/> <img src="<%=request.getContextPath()%>/plugins/jquery/tablesorter/addons/pager/icons/last.png" class="last"/> <select class="pagesize"> <option selected="selected" value="10">10</option> <option value="20">20</option> <option value="30">30</option> <option value="40">40</option> <option value="<s:property value="totalRegistros"/>">todos</option> </select> <s:label>Total de registros: <s:property value="totalRegistros"/></s:label> </form> </div> <br/> </div> Thanks!!!

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• Yii, Generate unquie ids one each tr element of CGridView

  - by Snow_Mac

  I have a CDbActiveRecord setup and I have a instance of the CGridView class setup as a widget. Basically my end game is I need a table, but each row to contain the primary key of the row associated with the Active Record. Such as: <tr id="123"> <td> Column value 1 </td> <td> Col 2 </td> <td> Col 3 </td> </tr> That's the specific of the row that I'm looking for. Here's the code I've got so far to produce a table. (The json variable is set because this is inside a controller and the widget is returned as json.) // get the content id for the version list $contentID_v = Yii::app()->request->getParam("id"); // setup the criteria to fetch related items $versionCdbCriteria = new CDbCriteria; $versionCdbCriteria->compare("contentID",$contentID_v); // setting up the active data provider for the version $vActiveDP = new CActiveDataProvider("FactsheetcontentVersion", array( "criteria" => $versionCdbCriteria, 'pagination' => array('PageSize' => $this->paginationSize), 'keyAttribute'=>'vID', )); $json_data .= $this->widget('zii.widgets.grid.CGridView', array( 'dataProvider' => $vActiveDP, 'columns' => array( 'title', 'created', 'createdBy' ), 'showTableOnEmpty' => 'false', ),true); This is what it produces for my active record. <div class="grid-view" id="yw0"> <div class="summary">Displaying 1-1 of 1 result(s).</div> <table class="items"><thead> <tr><th id="yw0_c0">Factsheettitle</th> <th id="yw0_c1"><a href="jq/work/admin/index.php?r=factsheetManager/Editor &amp;id=25601&amp;getV=true&amp;_=1341694154760&amp;FactsheetcontentVersion_sort=created">Created</a> </th> <th id="yw0_c2"><a href="jq/work/admin/index.php?r=factsheetManager/ Editor&amp;id=25601&amp;getV=true&amp;_=1341694154760&amp;FactsheetcontentVersion_sort=createdBy">Created By</a> </th> </tr></thead> <tbody><tr class="odd"><td>Distribution</td><td>0000-00-00 00:00:00</td><td>NULL</td></tr></tbody> </table> <div title="jq/work/admin/index.php?r=factsheetManager/Editor&amp;id=12&amp;id=25601&amp;getV=true&amp;_=1341694154760" style="display:none" class="keys"><span>8</span></div> </div>

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• Beginner question: ArrayList can't seem to get it right! Pls help

  - by elementz

  I have been staring at this code all day now, but just can't get it right. ATM I am just pushing codeblocks around without being able to concentrate anymore, with the due time being within almost an hour... So you guys are my last resort here. I am supposed to create a few random balls on a canvas, those balls being stored within an ArrayList (I hope an ArrayList is suitable here: the alternative options to choose from were HashSet and HashMap). Now, whatever I do, I get the differently colored balls at the top of my canvas, but they just get stuck there and refuse to move at all. Apart from that I now get a ConcurrentModificationException, when running the code: java.util.ConcurrentModificationException at java.util.AbstractList$Itr.checkForComodification(AbstractList.java:372) at java.util.AbstractList$Itr.next(AbstractList.java:343) at BallDemo.bounce(BallDemo.java:109) Reading up on that exception, I found out that one can make sure ArrayList is accessed in a threadsafe manner by somehow synchronizing access. But since I have remember fellow students doing without synchronizing, my guess is, that it would actually be the wrong path to go. Maybe you guys could help me get this to work, I at least need those stupid balls to move ;-) /** * Simulate random bouncing balls */ public void bounce(int count) { int ground = 400; // position of the ground line System.out.println(count); myCanvas.setVisible(true); // draw the ground myCanvas.drawLine(50, ground, 550, ground); // Create an ArrayList of type BouncingBalls ArrayList<BouncingBall>balls = new ArrayList<BouncingBall>(); for (int i = 0; i < count; i++){ Random numGen = new Random(); // Creating a random color. Color col = new Color(numGen.nextInt(256), numGen.nextInt(256), numGen.nextInt(256)); // creating a random x-coordinate for the balls int ballXpos = numGen.nextInt(550); BouncingBall bBall = new BouncingBall(ballXpos, 80, 20, col, ground, myCanvas); // adding balls to the ArrayList balls.add(bBall); bBall.draw(); boolean finished = false; } for (BouncingBall bBall : balls){ bBall.move(); } } This would be the original unmodified method we got from our teacher, which only creates two balls: /** * Simulate two bouncing balls */ public void bounce() { int ground = 400; // position of the ground line myCanvas.setVisible(true); myCanvas.drawLine(50, ground, 550, ground); // draw the ground // crate and show the balls BouncingBall ball = new BouncingBall(50, 50, 16, Color.blue, ground, myCanvas); ball.draw(); BouncingBall ball2 = new BouncingBall(70, 80, 20, Color.red, ground, myCanvas); ball2.draw(); // make them bounce boolean finished = false; while(!finished) { myCanvas.wait(50); // small delay ball.move(); ball2.move(); // stop once ball has travelled a certain distance on x axis if(ball.getXPosition() >= 550 && ball2.getXPosition() >= 550) { finished = true; } } ball.erase(); ball2.erase(); } }

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