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Facebook PHP SDK and Wordpress Error

- by Gecko

I have a developer environment setup with WAMP, Wordpress, and PHPEdit IDE. I use the Facebook, Twitter, and YouTube API's in a sidebar. I'm using Facebook's PHP SDK to display information(no login or admin functions). Since the FB SDK and WP use session_start() I get the following warning: Warning: session_start() [function.session-start]: Cannot send session cache limiter - headers already sent (output started at C:\wamp\www\dfi\wp-content\themes\DFI\header.php:12) in C:\wamp\www\dfi\wp-content\themes\DFI\api\facebook.php on line 36 I'm trying to figure this out by using the warning output but it doesn't help considering the following. I know about clearing white space and characters before and after <?php ?> and placing session_start() before any http output. I use unix line enders and UTF8 encoding without BOM. My host server is not set up for output_buffering. header.php line 11 to 13 11 <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> 12 <html xmlns="http://www.w3.org/1999/xhtml" <?php language_attributes();?>> 13 <head> It looks like the warning comes from inline php code. I don't know what I can do to fix this line. facebook.php line 34 to 37 34 public function __construct($config) { 35 if (!session_id()) { 36 session_start(); 37 } I don't think I can stop either FB or WP from calling session_start() without breaking everything. How do I make Wordpress and Facebook play nicely together without this error?

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Is there an alternative to Google Code Search?

- by blunders

Per the Official Google Blog: Code Search, which was designed to help people search for open source code all over the web, will be shut down along with the Code Search API on January 15, 2012. Google Code Search is now gone, and since that makes it much harder to understand the features it presented, here's my attempt to render them via information I gathered from a cache of the page for the Search Options: The "In Search Box" just notes the syntax to type the command directly in the main search box instead of using the advance search interface. Package (In Search Box: "package:linux-2.6") Language (In Search Box: "lang:c++") (OPTIONS: any language, actionscript, ada, applescript, asp, assembly, autoconf, automake, awk, basic, bat, c, c#, c++, caja, cobol, coldfusion, configure, css, d, eiffel, erlang, fortran, go, haskell, inform, java, java, javascript, jsp, lex, limbo, lisp, lolcode, lua, m4, makefile, maple, mathematica, matlab, messagecatalog, modula2, modula3, objectivec, ocaml, pascal, perl, php, pod, prolog, proto, python, python, r, rebol, ruby, sas, scheme, scilab, sgml, shell, smalltalk, sml, sql, svg, tcl, tex, texinfo, troff, verilog, vhdl, vim, xslt, xul, yacc) File (In Search Box: "file:^.*.java$") Class (In Search Box: "class:HashMap") Function (In Search Box: "function:toString") License (In Search Box: "license:mozilla") (OPTIONS: null/any-license, aladdin/Aladdin-Public-License, artistic/Artistic-License, apache/Apache-License, apple/Apple-Public-Source-License, bsd/BSD-License, cpl/Common-Public-License, epl/Eclipse-Public-License, agpl/GNU-Affero-General-Public-License, gpl/GNU-General-Public-License, lgpl/GNU-Lesser-General-Public-License, disclaimer/Historical-Permission-Notice-and-Disclaimer, ibm/IBM-Public-License, lucent/Lucent-Public-License, mit/MIT-License, mozilla/Mozilla-Public-License, nasa/NASA-Open-Source-Agreement, python/Python-Software-Foundation-License, qpl/Q-Public-License, sleepycat/Sleepycat-License, zope/Zope-Public-License) Case Sensitive (In Search Box: "case:no") (OPTIONS: yes, no) Also of use in understanding the search tool would be the still live FAQs page for Google Code Search. Is there any code search engine that would fully replace Google Code Search's features?

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CISCO Tapi with julmar atapi [closed]

- by uma

can we use julmar atapi for accessing cisco tapi/call manager functions?.. Is it a correct way to find solution. How to use cisco tapi with in .net application. Give me any sample code... Thanks in advance.. Sorry for the question with incomplete information. My requirement is, develop the interface for CUCM V8.6 (cisco unified call manager) with asp.net application. we need to communicate with CUCM to get the information about call details and force the user to enter authendication code. i got the information from web is, need C++ wrapper to access Tapi. Julmar Atapi is a free wrapper to access the Tapi. Our client need is , to use CISCO Tapi . My Question is , how to access CISCO Tapi from .Net Application. What is the Requirement? Is Julmar Atapi used to access CISCO Tapi? i want to use cisco FAC(Forced Authorization code) function. how to access this function from my application. Thanks in advance.

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SEO - Google and link cleaning / cloaking [closed]

- by Jens Törnell

Possible Duplicate: Does the Google spider render JavaScript? This a SEO related question, not a code related one. Googles own link cleaning / cloaking Gå to http://www.google.com and search for something. Hover the title and you will se a link to the page you want to go to. The URL you see when hovering is NOT the link you are clicking on. Instead of clicking you can drag the title a little bit and then hover it. Then you will se the real URL. My own link cleaning / cloaking Go to http://jsfiddle.net/NvmER/1/ and click the link, or look at the code below. You will be "redirected" to http://www.test.com. The real link are http://www.test.com/?event=23 Working code in case jsfiddle don't work If you need to se how it works I pasted a code below. <a class="direct" href="http://www.test.com/?event=23" data-redirect="http://www.test.com">Länk</a>? $(document).ready(function() { $("a.direct").live("mousedown", function(e){ var oldurl = $(this).attr('href'); var newurl = $(this).attr('data-redirect'); $(this).attr('href', newurl); }); });? Question Is this ok with Google? It's done with javascript. If you have an answer, link to a source or test to support it.

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Choosing a web development framework?

- by Bob

So, I've sort of reached a point where I want to start developing a website. Originally, I planned to build said website using PHP and CodeIgniter, I'm familiar with both, but, truth be told, I'm not too fond of either. I find they just get rather messy, CodeIgniter helps somewhat, but no matter what, it seems that most PHP comes out more obfuscated than it has to be. Anyways, I've come to the point where I want to either use Python or Ruby. I'm familiar in both, though more so towards Python, but I've never done any web development in them. I'll take the necessary time to learn the frameworks (and further my knowledge in the language of my choosing), but I need to choose one. I don't like either language more than the other, they both have their benefits... However, since I've never done any web development with either language, I was hoping that you guys could give me some pointers. What are the available frameworks for each language? What do you recommend and why? Note: I've primarily looked into Rails and Django - but I'm still open to others. I'm looking for one that will work for just one (or maybe two) developers. It has to be fairly easy to learn (but I will take the time to learn it). Also, I'd like it to easily support clean code and agile development.

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How should data be passed between client-side Javascript and C# code behind an ASP.NET app?

- by ctck

I'm looking for the most efficient / standard way of passing data between client-side Javascript code and C# code behind an ASP.NET application. I've been using the following methods to achieve this but they all feel a bit of a fudge. To pass data from Javascript to the C# code is by setting hidden ASP variables and triggering a postback: <asp:HiddenField ID="RandomList" runat="server" /> function SetDataField(data) { document.getElementById('<%=RandomList.ClientID%>').value = data; } Then in the C# code I collect the list: protected void GetData(object sender, EventArgs e) { var _list = RandomList.value; } Going back the other way I often use either ScriptManager to register a function and pass it data during Page_Load: ScriptManager.RegisterStartupScript(this.GetType(), "Set","get("Test();",true); or I add attributes to controls before a post back or during the initialization or pre-rendering stages: Btn.Attributes.Add("onclick", "DisplayMessage("Hello");"); These methods have served me well and do the job, but they just dont feel complete. Is there a more standard way of passing data between client side Javascript and C# backend code? Ive seen some posts like this one that describe HtmlElement class; is this something I should look into?

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Organizations & Architecture UNISA Studies – Chap 7

- by MarkPearl

Learning Outcomes Name different device categories Discuss the functions and structure of I/.O modules Describe the principles of Programmed I/O Describe the principles of Interrupt-driven I/O Describe the principles of DMA Discuss the evolution characteristic of I/O channels Describe different types of I/O interface Explain the principles of point-to-point and multipoint configurations Discuss the way in which a FireWire serial bus functions Discuss the principles of InfiniBand architecture External Devices An external device attaches to the computer by a link to an I/O module. The link is used to exchange control, status, and data between the I/O module and the external device. External devices can be classified into 3 categories… Human readable – e.g. video display Machine readable – e.g. magnetic disk Communications – e.g. wifi card I/O Modules An I/O module has two major functions… Interface to the processor and memory via the system bus or central switch Interface to one or more peripheral devices by tailored data links Module Functions The major functions or requirements for an I/O module fall into the following categories… Control and timing Processor communication Device communication Data buffering Error detection I/O function includes a control and timing requirement, to coordinate the flow of traffic between internal resources and external devices. Processor communication involves the following… Command decoding Data Status reporting Address recognition The I/O device must be able to perform device communication. This communication involves commands, status information, and data. An essential task of an I/O module is data buffering due to the relative slow speeds of most external devices. An I/O module is often responsible for error detection and for subsequently reporting errors to the processor. I/O Module Structure An I/O module functions to allow the processor to view a wide range of devices in a simple minded way. The I/O module may hide the details of timing, formats, and the electro mechanics of an external device so that the processor can function in terms of simple reads and write commands. An I/O channel/processor is an I/O module that takes on most of the detailed processing burden, presenting a high-level interface to the processor. There are 3 techniques are possible for I/O operations Programmed I/O Interrupt[t I/O DMA Access Programmed I/O When a processor is executing a program and encounters an instruction relating to I/O it executes that instruction by issuing a command to the appropriate I/O module. With programmed I/O, the I/O module will perform the requested action and then set the appropriate bits in the I/O status register. The I/O module takes no further actions to alert the processor. I/O Commands To execute an I/O related instruction, the processor issues an address, specifying the particular I/O module and external device, and an I/O command. There are four types of I/O commands that an I/O module may receive when it is addressed by a processor… Control – used to activate a peripheral and tell it what to do Test – Used to test various status conditions associated with an I/O module and its peripherals Read – Causes the I/O module to obtain an item of data from the peripheral and place it in an internal buffer Write – Causes the I/O module to take an item of data form the data bus and subsequently transmit that data item to the peripheral The main disadvantage of this technique is it is a time consuming process that keeps the processor busy needlessly I/O Instructions With programmed I/O there is a close correspondence between the I/O related instructions that the processor fetches from memory and the I/O commands that the processor issues to an I/O module to execute the instructions. Typically there will be many I/O devices connected through I/O modules to the system – each device is given a unique identifier or address – when the processor issues an I/O command, the command contains the address of the address of the desired device, thus each I/O module must interpret the address lines to determine if the command is for itself. When the processor, main memory and I/O share a common bus, two modes of addressing are possible… Memory mapped I/O Isolated I/O (for a detailed explanation read page 245 of book) The advantage of memory mapped I/O over isolated I/O is that it has a large repertoire of instructions that can be used, allowing more efficient programming. The disadvantage of memory mapped I/O over isolated I/O is that valuable memory address space is sued up. Interrupts driven I/O Interrupt driven I/O works as follows… The processor issues an I/O command to a module and then goes on to do some other useful work The I/O module will then interrupts the processor to request service when is is ready to exchange data with the processor The processor then executes the data transfer and then resumes its former processing Interrupt Processing The occurrence of an interrupt triggers a number of events, both in the processor hardware and in software. When an I/O device completes an I/O operations the following sequence of hardware events occurs… The device issues an interrupt signal to the processor The processor finishes execution of the current instruction before responding to the interrupt The processor tests for an interrupt – determines that there is one – and sends an acknowledgement signal to the device that issues the interrupt. The acknowledgement allows the device to remove its interrupt signal The processor now needs to prepare to transfer control to the interrupt routine. To begin, it needs to save information needed to resume the current program at the point of interrupt. The minimum information required is the status of the processor and the location of the next instruction to be executed. The processor now loads the program counter with the entry location of the interrupt-handling program that will respond to this interrupt. It also saves the values of the process registers because the Interrupt operation may modify these The interrupt handler processes the interrupt – this includes examination of status information relating to the I/O operation or other event that caused an interrupt When interrupt processing is complete, the saved register values are retrieved from the stack and restored to the registers Finally, the PSW and program counter values from the stack are restored. Design Issues Two design issues arise in implementing interrupt I/O Because there will be multiple I/O modules, how does the processor determine which device issued the interrupt? If multiple interrupts have occurred, how does the processor decide which one to process? Addressing device recognition, 4 general categories of techniques are in common use… Multiple interrupt lines Software poll Daisy chain Bus arbitration For a detailed explanation of these approaches read page 250 of the textbook. Interrupt driven I/O while more efficient than simple programmed I/O still requires the active intervention of the processor to transfer data between memory and an I/O module, and any data transfer must traverse a path through the processor. Thus is suffers from two inherent drawbacks… The I/O transfer rate is limited by the speed with which the processor can test and service a device The processor is tied up in managing an I/O transfer; a number of instructions must be executed for each I/O transfer Direct Memory Access When large volumes of data are to be moved, an efficient technique is direct memory access (DMA) DMA Function DMA involves an additional module on the system bus. The DMA module is capable of mimicking the processor and taking over control of the system from the processor. It needs to do this to transfer data to and from memory over the system bus. DMA must the bus only when the processor does not need it, or it must force the processor to suspend operation temporarily (most common – referred to as cycle stealing). When the processor wishes to read or write a block of data, it issues a command to the DMA module by sending to the DMA module the following information… Whether a read or write is requested using the read or write control line between the processor and the DMA module The address of the I/O device involved, communicated on the data lines The starting location in memory to read from or write to, communicated on the data lines and stored by the DMA module in its address register The number of words to be read or written, communicated via the data lines and stored in the data count register The processor then continues with other work, it delegates the I/O operation to the DMA module which transfers the entire block of data, one word at a time, directly to or from memory without going through the processor. When the transfer is complete, the DMA module sends an interrupt signal to the processor, this the processor is involved only at the beginning and end of the transfer. I/O Channels and Processors Characteristics of I/O Channels As one proceeds along the evolutionary path, more and more of the I/O function is performed without CPU involvement. The I/O channel represents an extension of the DMA concept. An I/O channel ahs the ability to execute I/O instructions, which gives it complete control over I/O operations. In a computer system with such devices, the CPU does not execute I/O instructions – such instructions are stored in main memory to be executed by a special purpose processor in the I/O channel itself. Two types of I/O channels are common A selector channel controls multiple high-speed devices. A multiplexor channel can handle I/O with multiple characters as fast as possible to multiple devices. The external interface: FireWire and InfiniBand Types of Interfaces One major characteristic of the interface is whether it is serial or parallel parallel interface – there are multiple lines connecting the I/O module and the peripheral, and multiple bits are transferred simultaneously serial interface – there is only one line used to transmit data, and bits must be transmitted one at a time With new generation serial interfaces, parallel interfaces are becoming less common. In either case, the I/O module must engage in a dialogue with the peripheral. In general terms the dialog may look as follows… The I/O module sends a control signal requesting permission to send data The peripheral acknowledges the request The I/O module transfers data The peripheral acknowledges receipt of data For a detailed explanation of FireWire and InfiniBand technology read page 264 – 270 of the textbook

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Is there a measure of code rot?

- by DarenW

I'm dealing, again, with a messy C++ application, tons of classes with confusing names, objects have pointers into each other and all over, longwinded Boost and STL data types, etc. (Pause and consider your favorite terror of messy legacy code. We probably have it.) The phrase "code rot" oft comes to mind when I work on this project. Is there a quantitative way to measure code rot? I wouldn't expect anything highly meaningful or scientific, since no other measure of code productivity or quality is so fine. I'm not looking for a mere opposite of measures of code quality, but specifically a measure of how many bad things happened after a series of maintenance software "engineers" have had turns hacking at the code. A general measure applying to any language, or many languages, would be great. If there's no such thing, at least for C++, which is a better than average language for creating messes. Maybe something involving a measure of topology of how objects connect during runtime, a count of chunks of commented out code, how mane files a typical variable's usage is scattered over, I don't know... but surely now, a decade into the 21st Century, someone has attempted to define some sort of rot measure. It would be especially interesting to automate a series of svn checkouts, measure the "rottenosity" of each, and plot the decay over time.

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BIEE Drilling Down and then Across

- by Tim Dexter

Slightly off topic today but if you are working with OBIEE in conjunction with BIP its not that far off. Some of you may know, I now get to play with the whole BI suite, I have been for nearly 2 years. Today, I was working with BIEE and wanted to share what I thought was a neat trick. I have to thank Rob Lindsley on our team for the pointers to get it working. The problem I had was that I had set up a drill down hierarchy that took the user down a couple of levels to the bottom project number level. I needed for the user to then be able to click the project number to navigate across to another more detailed report on that project. By default, there is no link, you are at the bottom of a hierarchical drill! There is nothing you can do in the data model (that Im aware of) but you can use a neat trick to get BIEE to allow you to navigate from the bottom rung of the hierarchy. Add the bottom level column to an Answer report. Go into the column properties and set the navigation target. The trick is to then set the current column properties as the system-wide default for that column. You can then actually delete the column from your report. Now as you drill down the hierarchy and reach what was the bottom you will still have a link for the user to punch over to the detail report, sweeeet! The other benefit is that whenever you add the column to a report the link will be available to the detail report, unless you want to override it of course.

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Disk space suddenly 100% used?

- by dannymcc

I'm trying to identify why, suddenly, 100% of our disk space is in use. I have already rebooted but the issue persists. Here are the outputs of some commands that are showing some strange (for me) results: danny@hydrogen:~$ df -h Filesystem Size Used Avail Use% Mounted on /dev/cciss/c0d0p1 130G 122G 949M 100% / none 1.9G 196K 1.9G 1% /dev none 2.0G 0 2.0G 0% /dev/shm none 2.0G 40K 2.0G 1% /var/run none 2.0G 0 2.0G 0% /var/lock none 2.0G 0 2.0G 0% /lib/init/rw danny@hydrogen:/$ sudo du -chs / du: cannot access `/proc/1662/task/1662/fd/4': No such file or directory du: cannot access `/proc/1662/task/1662/fdinfo/4': No such file or directory du: cannot access `/proc/1662/fd/4': No such file or directory du: cannot access `/proc/1662/fdinfo/4': No such file or directory danny@hydrogen:/$ df Filesystem 1K-blocks Used Available Use% Mounted on /dev/cciss/c0d0p1 135342296 128144108 323104 100% / none 1991336 196 1991140 1% /dev none 1995788 0 1995788 0% /dev/shm none 1995788 40 1995748 1% /var/run none 1995788 0 1995788 0% /var/lock none 1995788 0 1995788 0% /lib/init/rw danny@hydrogen:/$ mount /dev/cciss/c0d0p1 on / type ext4 (rw,errors=remount-ro) proc on /proc type proc (rw,noexec,nosuid,nodev) none on /sys type sysfs (rw,noexec,nosuid,nodev) none on /sys/fs/fuse/connections type fusectl (rw) none on /sys/kernel/debug type debugfs (rw) none on /sys/kernel/security type securityfs (rw) none on /dev type devtmpfs (rw,mode=0755) none on /dev/pts type devpts (rw,noexec,nosuid,gid=5,mode=0620) none on /dev/shm type tmpfs (rw,nosuid,nodev) none on /var/run type tmpfs (rw,nosuid,mode=0755) none on /var/lock type tmpfs (rw,noexec,nosuid,nodev) none on /lib/init/rw type tmpfs (rw,nosuid,mode=0755) danny@hydrogen:/$ sudo du -h --max-depth=1 634M ./premvet_sync 5.6M ./etc 4.0K ./opt 16K ./lost+found 7.4M ./bin 623M ./lib 196K ./dev 0 ./sys 4.0K ./srv 4.0K ./cdrom 8.0K ./media 52K ./tmp ... it hangs for ages here..... The server is running Ubuntu 10.04.4 LTS. System load: 2.85 Temperature: 8 C Usage of /: 94.7% of 129.07GB Processes: 132 Memory usage: 39% Users logged in: 0 Swap usage: 0% IP address for eth0: 192.168.1.124 => / is using 94.7% of 129.07GB I'm struggling to comprehend why this is happening! Any pointers would be appreciated.

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help animating player in corona sdk

- by andrew McCutchan

working on a game in the corona sdk with lua and I need help so the player animates on the line drawn. Right now he animates at the beggining and the end but not on the line. here is the player code function spawnPlayerObject(xPlayerSpawn,yPlayerSpawn,richTurn) --spawns Rich where we need him. -- riches sprite sheet and all his inital spirites. We need to adjust this so that animations 3-6 are the only ones that animate when moving horizontally local richPlayer = sprite.newSpriteSet(richSheet1,1,6) sprite.add(richPlayer, "rich", 1,6,500,1) rich = sprite.newSprite(richPlayer) rich.x = xPlayerSpawn rich.y = yPlayerSpawn rich:scale(_W*0.0009, _W*0.0009) -- scale is used to adjust the size of the object. richDir = richTurn rich.rotation = richDir rich:prepare("rich") rich:play() physics.addBody( rich, "static", { friction=1, radius = 15 } ) -- needs a better physics body for collision detection. end and here is the code for the line function movePlayerOnLine(event) --for the original image replace all rich with player. if posCount ~= linePart then richDir = math.atan2(ractgangle_hit[posCount].y-rich.y,ractgangle_hit[posCount].x-rich.x)*180/math.pi playerSpeed = 5 rich.x = rich.x + math.cos(richDir*math.pi/180)*playerSpeed rich.y = rich.y + math.sin(richDir*math.pi/180)*playerSpeed if rich.x < ractgangle_hit[posCount].x+playerSpeed*10 and rich.x > ractgangle_hit[posCount].x-playerSpeed*10 then if rich.y < ractgangle_hit[posCount].y+playerSpeed*10 and rich.y > ractgangle_hit[posCount].y-playerSpeed*10 then posCount = posCount + 1 end end I don't think anything has changed recently but I have been getting an error when testing of " attempt to upvalue "rich" a nil value" on the second line, richDir = etc.

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Procedural... house with rooms generator

- by pek

I've been looking at some algorithms and articles about procedurally generating a dungeon. The problem is, I'm trying to generate a house with rooms, and they don't seem to fit my requirements. For one, dungeons have corridors, where houses have halls. And while initially they might seem the same, a hall is nothing more than the area that isn't a room, whereas a corridor is specifically designed to connect one area to another. Another important difference with a house is that you have a specific width and height, and you have to fill the entire thing with rooms and halls, whereas with a dungeon, there is empty space. I think halls in a house is something in between a dungeon corridor (gets you to other rooms) and an empty space in the dungeon (it's not explicitly defined in code). More specifically, the requirements are: There is a set of predefined rooms I cannot create walls and doors on the fly. Rooms can be rotated but not resized Again, because I have a predefined set of rooms, I can only rotate them, not resize them. The house dimensions are set and has to be entirely filled with rooms (or halls) I.e. I want to fill a 14x20 house with the available rooms making sure there is no empty space. Here are some images to make this a little more clear: As you can see, in the house, the "empty space" is still walkable and it gets you from one room to another. So, having said all this, maybe a house is just a really really tightly packed dungeon with corridors. Or it's something easier than a dungeon. Maybe there is something out there and I haven't found it because I don't really know what to search for. This is where I'd like your help: could you give me pointers on how to design this algorithm? Any thoughts on what steps it will take? If you have created a dungeon generator, how would you modify it to fit my requirements? You can be as specific or as generic as you like. I'm looking to pick your brains, really.

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Mirror using apt-mirror and exclud certain sections/categories

- by Onitlikesonic

I'm currently using apt-mirror to create a local mirror of the debian repositories. As the mirrored repositories will be used only by machines destined to be headless servers and as an effort to reduce the current mirroring size (around 75GB), categories like games and possibly others will never be needed. How can I go about specifying (on the mirror.list perhaps?) what sections/categories I want to be excluded from the mirroring? Maybe a bit subjective, but apart from games what other sections/categories could be "safely" ignored from the mirroring for my environment purposes? My mirror.list looks as below since all the machines are using precise. # MAIN deb-amd64 http://archive.ubuntu.com/ubuntu precise main restricted universe multiverse deb-i386 http://archive.ubuntu.com/ubuntu precise main restricted universe multiverse # SECURITY deb-amd64 http://archive.ubuntu.com/ubuntu precise-security main restricted universe multiverse deb-i386 http://archive.ubuntu.com/ubuntu precise-security main restricted universe multiverse Also, what others would you recommend adding to the list to be mirrored for a relatively stable environment? Again I understand this is subjective, just looking for some pointers. Much appreciated in advance

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Ubuntu 12.04 + Raid0 + Windows 7 not loading

- by Douglas

please someone help me.... (Sorry for my english) Hi, I have a Pc with 2 Hd (1Tb each) on Raid0. I had a Windows 7 64bits working for several months. When I installed the Windows I let a 100Gb partition empty to install Ubuntu someday. I was using Linux on a Virtualbox, but this week I tried to install Ubuntu 12.04 in this 100Gb partition. I used the Ubuntu alternate cd, because the 'normal' cd was giving me trouble with the Raid0. The grub installation always reported a error. After a lot of work I found that I nedded to install grub on partition /dev/mapper/isw_chjbfeec_DougRaid1 (see Bootinfo below). The Windows installation created a 100Mb boot partition, so I needed to install grub in this partition. Now I have the Ubuntu working 100% ok. The problem is, the Windows is not booting! The windows option is present on the grub menu, but when I choose the windows option there is a black screen and after that the grub is reloaded. My Bootinfo is: Boot Info Script 0.61 [1 April 2012] ============================= Boot Info Summary: =============================== => Grub2 (v1.99) is installed in the MBR of /dev/sda and looks at sector 1 of the same hard drive for core.img. core.img is at this location and looks in partition 1 for /boot/grub. => Grub2 (v1.99) is installed in the MBR of /dev/mapper/isw_chjbfeec_DougRaid and looks at sector 1 of the same hard drive for core.img. core.img is at this location and looks in partition 1 for /boot/grub. sda1: __________________________________________________________________________ File system: Boot sector type: Unknown Boot sector info: Mounting failed: mount: unknown filesystem type '' sda2: __________________________________________________________________________ File system: Boot sector type: Unknown Boot sector info: Mounting failed: mount: unknown filesystem type '' mount: unknown filesystem type '' sda3: __________________________________________________________________________ File system: Extended Partition Boot sector type: Unknown Boot sector info: isw_chjbfeec_DougRaid1: ________________________________________________________ File system: ntfs Boot sector type: Grub2 (v1.99) Boot sector info: Grub2 (v1.99) is installed in the boot sector of isw_chjbfeec_DougRaid1 and looks at sector 3841862992 of the same hard drive for core.img. core.img is at this location and looks for (,msdos5)/boot/grub on this drive. No errors found in the Boot Parameter Block. Operating System: Boot files: /grldr /bootmgr /Boot/BCD /grldr isw_chjbfeec_DougRaid2: ________________________________________________________ File system: ntfs Boot sector type: Windows Vista/7: NTFS Boot sector info: No errors found in the Boot Parameter Block. Operating System: Windows 7 Boot files: /Windows/System32/winload.exe isw_chjbfeec_DougRaid3: ________________________________________________________ File system: Extended Partition Boot sector type: - Boot sector info: isw_chjbfeec_DougRaid5: ________________________________________________________ File system: ext4 Boot sector type: - Boot sector info: Operating System: Ubuntu 12.04 LTS Boot files: /boot/grub/grub.cfg /etc/fstab /boot/grub/core.img isw_chjbfeec_DougRaid6: ________________________________________________________ File system: swap Boot sector type: - Boot sector info: ============================ Drive/Partition Info: ============================= Drive: sda _____________________________________________________________________ Partition Boot Start Sector End Sector # of Sectors Id System /dev/sda1 * 2,048 206,847 204,800 7 NTFS / exFAT / HPFS /dev/sda2 206,848 3,686,402,047 3,686,195,200 7 NTFS / exFAT / HPFS /dev/sda3 3,686,402,558 3,907,039,743 220,637,186 5 Extended Invalid MBR Signature found. EBR refers to a location outside the hard drive. /dev/sda2 ends after the last sector of /dev/sda /dev/sda3 ends after the last sector of /dev/sda Drive: isw_chjbfeec_DougRaid _____________________________________________________________________ Disk /dev/mapper/isw_chjbfeec_DougRaid: 2000.4 GB, 2000404348928 bytes 255 heads, 63 sectors/track, 243201 cylinders, total 3907039744 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes Partition Boot Start Sector End Sector # of Sectors Id System /dev/mapper/isw_chjbfeec_DougRaid1 * 2,048 206,847 204,800 7 NTFS / exFAT / HPFS /dev/mapper/isw_chjbfeec_DougRaid2 206,848 3,686,402,047 3,686,195,200 7 NTFS / exFAT / HPFS /dev/mapper/isw_chjbfeec_DougRaid3 3,686,402,558 3,907,039,743 220,637,186 5 Extended /dev/mapper/isw_chjbfeec_DougRaid5 3,686,402,560 3,881,876,479 195,473,920 83 Linux /dev/mapper/isw_chjbfeec_DougRaid6 3,881,876,992 3,907,039,743 25,162,752 82 Linux swap / Solaris "blkid" output: ________________________________________________________________ Device UUID TYPE LABEL /dev/mapper/isw_chjbfeec_DougRaid1 C89C73D19C73B910 ntfs Reservado pelo Sistema /dev/mapper/isw_chjbfeec_DougRaid2 6830883A3088116C ntfs /dev/mapper/isw_chjbfeec_DougRaid5 bbab868a-ea53-4be3-ba7d-2737fe6cb24c ext4 /dev/mapper/isw_chjbfeec_DougRaid6 7a830a3c-88fb-4cba-80dc-f32e08abfd5b swap /dev/sda isw_raid_member /dev/sdb isw_raid_member /dev/sr0 iso9660 Windows7x86x64SK ========================= "ls -R /dev/mapper/" output: ========================= /dev/mapper: control isw_chjbfeec_DougRaid isw_chjbfeec_DougRaid1 isw_chjbfeec_DougRaid2 isw_chjbfeec_DougRaid3 isw_chjbfeec_DougRaid5 isw_chjbfeec_DougRaid6 ================================ Mount points: ================================= Device Mount_Point Type Options /dev/mapper/isw_chjbfeec_DougRaid5 / ext4 (rw,errors=remount-ro) /dev/sr0 /media/Windows7x86x64SK iso9660 (ro,nosuid,nodev,uid=1000,gid=1000,iocharset=utf8,mode=0400,dmode=0500,uhelper=udisks) ================= isw_chjbfeec_DougRaid1/grldr embedded menu: ================== -------------------------------------------------------------------------------- -------------------------------------------------------------------------------- ================== isw_chjbfeec_DougRaid5/boot/grub/grub.cfg: ================== -------------------------------------------------------------------------------- # # DO NOT EDIT THIS FILE # # It is automatically generated by grub-mkconfig using templates # from /etc/grub.d and settings from /etc/default/grub # ### BEGIN /etc/grub.d/00_header ### if [ -s $prefix/grubenv ]; then set have_grubenv=true load_env fi set default="0" if [ "${prev_saved_entry}" ]; then set saved_entry="${prev_saved_entry}" save_env saved_entry set prev_saved_entry= save_env prev_saved_entry set boot_once=true fi function savedefault { if [ -z "${boot_once}" ]; then saved_entry="${chosen}" save_env saved_entry fi } function recordfail { set recordfail=1 if [ -n "${have_grubenv}" ]; then if [ -z "${boot_once}" ]; then save_env recordfail; fi; fi } function load_video { insmod vbe insmod vga insmod video_bochs insmod video_cirrus } insmod part_msdos insmod ext2 set root='(/dev/mapper/isw_chjbfeec_DougRaid3,msdos1)' search --no-floppy --fs-uuid --set=root bbab868a-ea53-4be3-ba7d-2737fe6cb24c if loadfont /usr/share/grub/unicode.pf2 ; then set gfxmode=auto load_video insmod gfxterm insmod part_msdos insmod ext2 set root='(/dev/mapper/isw_chjbfeec_DougRaid3,msdos1)' search --no-floppy --fs-uuid --set=root bbab868a-ea53-4be3-ba7d-2737fe6cb24c set locale_dir=($root)/boot/grub/locale set lang=en_US insmod gettext fi terminal_output gfxterm if [ "${recordfail}" = 1 ]; then set timeout=-1 else set timeout=10 fi ### END /etc/grub.d/00_header ### ### BEGIN /etc/grub.d/05_debian_theme ### set menu_color_normal=white/black set menu_color_highlight=black/light-gray if background_color 44,0,30; then clear fi ### END /etc/grub.d/05_debian_theme ### ### BEGIN /etc/grub.d/10_linux ### function gfxmode { set gfxpayload="$1" if [ "$1" = "keep" ]; then set vt_handoff=vt.handoff=7 else set vt_handoff= fi } if [ ${recordfail} != 1 ]; then if [ -e ${prefix}/gfxblacklist.txt ]; then if hwmatch ${prefix}/gfxblacklist.txt 3; then if [ ${match} = 0 ]; then set linux_gfx_mode=keep else set linux_gfx_mode=text fi else set linux_gfx_mode=text fi else set linux_gfx_mode=keep fi else set linux_gfx_mode=text fi export linux_gfx_mode if [ "$linux_gfx_mode" != "text" ]; then load_video; fi menuentry 'Ubuntu, with Linux 3.2.0-24-generic-pae' --class ubuntu --class gnu-linux --class gnu --class os { recordfail gfxmode $linux_gfx_mode insmod gzio insmod part_msdos insmod ext2 set root='(/dev/mapper/isw_chjbfeec_DougRaid3,msdos1)' search --no-floppy --fs-uuid --set=root bbab868a-ea53-4be3-ba7d-2737fe6cb24c linux /boot/vmlinuz-3.2.0-24-generic-pae root=UUID=bbab868a-ea53-4be3-ba7d-2737fe6cb24c ro quiet splash $vt_handoff initrd /boot/initrd.img-3.2.0-24-generic-pae } menuentry 'Ubuntu, with Linux 3.2.0-24-generic-pae (recovery mode)' --class ubuntu --class gnu-linux --class gnu --class os { recordfail insmod gzio insmod part_msdos insmod ext2 set root='(/dev/mapper/isw_chjbfeec_DougRaid3,msdos1)' search --no-floppy --fs-uuid --set=root bbab868a-ea53-4be3-ba7d-2737fe6cb24c echo 'Loading Linux 3.2.0-24-generic-pae ...' linux /boot/vmlinuz-3.2.0-24-generic-pae root=UUID=bbab868a-ea53-4be3-ba7d-2737fe6cb24c ro recovery nomodeset echo 'Loading initial ramdisk ...' initrd /boot/initrd.img-3.2.0-24-generic-pae } submenu "Previous Linux versions" { menuentry 'Ubuntu, with Linux 3.2.0-23-generic-pae' --class ubuntu --class gnu-linux --class gnu --class os { recordfail gfxmode $linux_gfx_mode insmod gzio insmod part_msdos insmod ext2 set root='(/dev/mapper/isw_chjbfeec_DougRaid3,msdos1)' search --no-floppy --fs-uuid --set=root bbab868a-ea53-4be3-ba7d-2737fe6cb24c linux /boot/vmlinuz-3.2.0-23-generic-pae root=UUID=bbab868a-ea53-4be3-ba7d-2737fe6cb24c ro quiet splash $vt_handoff initrd /boot/initrd.img-3.2.0-23-generic-pae } menuentry 'Ubuntu, with Linux 3.2.0-23-generic-pae (recovery mode)' --class ubuntu --class gnu-linux --class gnu --class os { recordfail insmod gzio insmod part_msdos insmod ext2 set root='(/dev/mapper/isw_chjbfeec_DougRaid3,msdos1)' search --no-floppy --fs-uuid --set=root bbab868a-ea53-4be3-ba7d-2737fe6cb24c echo 'Loading Linux 3.2.0-23-generic-pae ...' linux /boot/vmlinuz-3.2.0-23-generic-pae root=UUID=bbab868a-ea53-4be3-ba7d-2737fe6cb24c ro recovery nomodeset echo 'Loading initial ramdisk ...' initrd /boot/initrd.img-3.2.0-23-generic-pae } } ### END /etc/grub.d/10_linux ### ### BEGIN /etc/grub.d/20_linux_xen ### ### END /etc/grub.d/20_linux_xen ### ### BEGIN /etc/grub.d/20_memtest86+ ### menuentry "Memory test (memtest86+)" { insmod part_msdos insmod ext2 set root='(/dev/mapper/isw_chjbfeec_DougRaid3,msdos1)' search --no-floppy --fs-uuid --set=root bbab868a-ea53-4be3-ba7d-2737fe6cb24c linux16 /boot/memtest86+.bin } menuentry "Memory test (memtest86+, serial console 115200)" { insmod part_msdos insmod ext2 set root='(/dev/mapper/isw_chjbfeec_DougRaid3,msdos1)' search --no-floppy --fs-uuid --set=root bbab868a-ea53-4be3-ba7d-2737fe6cb24c linux16 /boot/memtest86+.bin console=ttyS0,115200n8 } ### END /etc/grub.d/20_memtest86+ ### ### BEGIN /etc/grub.d/30_os-prober_proxy ### menuentry "Windows 7 (loader) (on /dev/mapper/isw_chjbfeec_DougRaid1)" --class windows --class os { insmod part_msdos insmod ntfs set root='(sda,msdos1)' search --no-floppy --fs-uuid --set=root C89C73D19C73B910 chainloader +1 } ### END /etc/grub.d/30_os-prober_proxy ### ### BEGIN /etc/grub.d/40_custom ### # This file provides an easy way to add custom menu entries. Simply type the # menu entries you want to add after this comment. Be careful not to change # the 'exec tail' line above. ### END /etc/grub.d/40_custom ### ### BEGIN /etc/grub.d/41_custom ### if [ -f $prefix/custom.cfg ]; then source $prefix/custom.cfg; fi ### END /etc/grub.d/41_custom ### -------------------------------------------------------------------------------- ====================== isw_chjbfeec_DougRaid5/etc/fstab: ======================= -------------------------------------------------------------------------------- # /etc/fstab: static file system information. # # Use 'blkid' to print the universally unique identifier for a # device; this may be used with UUID= as a more robust way to name devices # that works even if disks are added and removed. See fstab(5). # # <file system> <mount point> <type> <options> <dump> <pass> proc /proc proc nodev,noexec,nosuid 0 0 /dev/mapper/isw_chjbfeec_DougRaid5 / ext4 errors=remount-ro 0 1 /dev/mapper/isw_chjbfeec_DougRaid6 none swap sw 0 0 -------------------------------------------------------------------------------- ========== isw_chjbfeec_DougRaid5: Location of files loaded by Grub: =========== GiB - GB File Fragment(s) = boot/grub/core.img 1 = boot/grub/grub.cfg 1 = boot/initrd.img-3.2.0-23-generic-pae 2 = boot/initrd.img-3.2.0-24-generic-pae 2 = boot/vmlinuz-3.2.0-23-generic-pae 1 = boot/vmlinuz-3.2.0-24-generic-pae 1 = initrd.img 2 = initrd.img.old 2 = vmlinuz 1 = vmlinuz.old 1 ======================== Unknown MBRs/Boot Sectors/etc: ======================== Unknown BootLoader on sda1 Unknown BootLoader on sda2 Unknown BootLoader on sda3 =============================== StdErr Messages: =============================== xz: (stdin): Compressed data is corrupt xz: (stdin): Compressed data is corrupt hexdump: /dev/sda1: No such file or directory hexdump: /dev/sda1: No such file or directory hexdump: /dev/sda2: No such file or directory hexdump: /dev/sda2: No such file or directory hexdump: /dev/sda3: No such file or directory hexdump: /dev/sda3: No such file or directory xz: (stdin): Compressed data is corrupt awk: cmd. line:36: Math support is not compiled in awk: cmd. line:36: Math support is not compiled in awk: cmd. line:36: Math support is not compiled in awk: cmd. line:36: Math support is not compiled in awk: cmd. line:36: Math support is not compiled in awk: cmd. line:36: Math support is not compiled in awk: cmd. line:36: Math support is not compiled in awk: cmd. line:36: Math support is not compiled in awk: cmd. line:36: Math support is not compiled in awk: cmd. line:36: Math support is not compiled in How we can see the Windows part at grub is: menuentry "Windows 7 (loader) (on /dev/mapper/isw_chjbfeec_DougRaid1)" --class windows --class os { insmod part_msdos insmod ntfs set root='(sda,msdos1)' search --no-floppy --fs-uuid --set=root C89C73D19C73B910 chainloader +1 } I tried a lot of combinations at the line: set root='(sda,msdos1)' , but no success I tried to change uuid to the /dev/mapper/isw_chjbfeec_DougRaid2 uuid, but the grub reports a error. I dont know what to do now. I really need to boot my windows partition. Someone knows what to do? Thanks........

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Why use try … finally without a catch clause?

- by Nick Rosencrantz

The classical way to program is with try / catch but when is it appropriate to use try without catch? In Python the following appears legal and can make sense: try: #do work finally: #do something unconditional But we didn't catch anything. Similarly one could think in Java it would be try { //for example try to get a database connection } finally { //closeConnection(connection) } It looks good and suddenly I don't have to worry about exception types etc. But if this is good practice, when is it good practice? Or reasons why this is not good practice or not legal (I didn't compile the source I'm asking about and it could be a syntax error for Java but I checked that the Python surely compiles.) A related problem I've run into is that I continue writing the function / method and at the end I must return something and I'm in a place which should not be reached and it must be a return point so even if I handle the exceptions above I'm still returning null or an empty string at some point in the code which should not be reached, often the end of the method / function. I've always managed to restructure to code so that I don't have to return null since that absolutely appears to look like less than good practice.

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help animating a player in Corona SDK

- by andrew McCutchan

Working on a game in the Corona SDK with Lua and I need help so the player animates on the line drawn. Right now he animates at the beggining and the end but not on the line. Here is the player code: function spawnPlayerObject(xPlayerSpawn,yPlayerSpawn,richTurn) --spawns Rich where we need him. -- riches sprite sheet and all his inital spirites. We need to adjust this so that animations 3-6 are the only ones that animate when moving horizontally local richPlayer = sprite.newSpriteSet(richSheet1,1,6) sprite.add(richPlayer, "rich", 1,6,500,1) rich = sprite.newSprite(richPlayer) rich.x = xPlayerSpawn rich.y = yPlayerSpawn rich:scale(_W*0.0009, _W*0.0009) -- scale is used to adjust the size of the object. richDir = richTurn rich.rotation = richDir rich:prepare("rich") rich:play() physics.addBody( rich, "static", { friction=1, radius = 15 } ) -- needs a better physics body for collision detection. end And here is the code for the line: function movePlayerOnLine(event) --for the original image replace all rich with player. if posCount ~= linePart then richDir = math.atan2(ractgangle_hit[posCount].y-rich.y,ractgangle_hit[posCount].x-rich.x)*180/math.pi playerSpeed = 5 rich.x = rich.x + math.cos(richDir*math.pi/180)*playerSpeed rich.y = rich.y + math.sin(richDir*math.pi/180)*playerSpeed if rich.x < ractgangle_hit[posCount].x+playerSpeed*10 and rich.x > ractgangle_hit[posCount].x-playerSpeed*10 then if rich.y < ractgangle_hit[posCount].y+playerSpeed*10 and rich.y > ractgangle_hit[posCount].y-playerSpeed*10 then posCount = posCount + 1 end end I don't think anything has changed recently but I have been getting an error when testing of "attempt to upvalue "rich" a nil value" on the second line, richDir = etc.

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How are events in games handled?

- by Alex

In may games that I have played, I have seen events being triggered, such as when you walk into a certain land area while holding a specific object, it will trigger a special creature to spawn. I was wondering, how do games deal with events such as this? Not in a specific game, but in general among games. The first thought I had was that each place has a hard-coded set of events that it will call when something happens there. However, that would be too inefficient to maintain, as when something new is added, that would require modification of every part of the game that would potentially cause the event to be called. Next up, I had the idea of maybe how GUI programming works. In all of the GUI programming I've done, you create a component and a callback function, or a listener. Then, when the user interacts when the button, the callback function is called, allowing you to do something with it. So, I was thinking that in terms of a game, when a land area gets loaded the game loops over a list of all events, creating instances of them and calling public methods to bind them to the current scene. The events themselves then handle what scene it is, and if it is a scene that pertains to the event, will call the public method of the scene to bind the event to an action. Then, when the action takes place, the scene would call all events that are bound to that action. However, I'm sure that's not how games would operate either, as that would require a lot of creating of events all the time. So how to video games handle events, are either of those methods correct, or is it something completely different?

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Good resources for learning Rails?

- by Bobby Tables

I just finished working through Peter Cooper's "Beginning Ruby". So now I've got a reasonable grounding in the Ruby language and would like to move onto learning Rails. This question's answers give some good pointers, but I'd like to hear some specific reviews of books and online materials. I generally learn best by working through books with good practical/technical examples AND some passive reading content that breaks up the study between practical and reading sessions (this is what made "Beginning Ruby" great for me), but I'm worried that RoR is evolving fast and that any printed book I order might be obsolete by the time I get it and work through it. Is this a fair worry? Or can anyone recommend a good Rails 3 book that should be up to date at least for the next year or so? Also, I had a brief look at some of the online resources from the other questions, and Rails for Zombies seems to get a lot of praise. Has anyone here actually used it as their introductory guide to Rails? Basically I'd like to hear first-hand accounts of people who went through this "Ruby-to-Rails" learning phase recently and which materials were useful to you.

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Drawing particles with CPU instead of GPU (XNA)

- by Helix

I'm trying out modifications to the following particle system. http://create.msdn.com/en-US/education/catalog/sample/particle_3d I have a function such that when I press Space, all the particles have their positions and velocities set to 0. for (int i = 0; i < particles.GetLength(0); i++) { particles[i].Position = Vector3.Zero; particles[i].Velocity = Vector3.Zero; } However, when I press space, the particles are still moving. If I go to FireParticleSystem.cs I can turn settings.Gravity to 0 and the particles stop moving, but the particles are still not being shifted to (0,0,0). As I understand it, the problem lies in the fact that the GPU is processing all the particle positions, and it's calculating where the particles should be based on their initial position, their initial velocity and multiplying by their age. Therefore, all I've been able to do is change the initial position and velocity of particles, but I'm unable to do it on the fly since the GPU is handling everything. I want the CPU to calculate the positions of the particles individually. This is because I will be later implementing some sort of wind to push the particles around. How do I stop the GPU from taking over? I think it's something to do with VertexBuffers and the draw function, but I don't know how to modify it to make it work.

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Using ASP.NET C# and Javascript

- by ctck

I'm looking for the most efficient / standardized way of passing data between client javascript code and C# code behind in an ASP.NET application. Currently ive been using the following methods to achieve this but they all feel a bit like a fudge. The way i pass data from javascript to the C# code behind is by setting hidden asp variables and triggering a postback <asp:HiddenField ID="RandomList" runat="server" /> function SetDataField(data) { document.getElementById('<%=RandomList.ClientID%>').value = data; } Then in C# code i collect the list protected void GetData(object sender, EventArgs e) { var _list = RandomList.value; } Going back the other way i often use either scriptmanager to register a function and pass it data during Page_Load: ScriptManager.RegisterStartupScript(this.GetType(), "Set","get("Test();",true); or i add attributes to controls before a post back or during Initialization / pre rendering stages: Btn.Attributes.Add("onclick", "DisplayMessage("Hello");"); These methods have served me well and do the job. However they just dont feel complete. Is there a more standardized way of passing data between client side markup / javascript and backend code. Ive seen some posts like this one: Injecting JavaScrip : StackOverflow that describe HtmlElement class. Is this something is should look into? Thanks everyone for your time.

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How do I load tmx files with Slick2d?

- by mbreen

I just started using Slick2D and learned how simple it is to load in a tilemap and display it. I tried atleast a dozen different tmx files from numerous examples to see if it was the actual file that was corrupted. Everytime I get this error: Exception in thread "main" java.lang.RuntimeException: Resource not found: data/maps/desert.tmx at org.newdawn.slick.util.ResourceLoader.getResourceAsStream(ResourceLoader.java:69) at org.newdawn.slick.tiled.TiledMap.<init>(TiledMap.java:101) at game.Game.init(Game.java:17) at game.Tunneler.initStatesList(Tunneler.java:37) at org.newdawn.slick.state.StateBasedGame.init(StateBasedGame.java:164) at org.newdawn.slick.AppGameContainer.setup(AppGameContainer.java:390) at org.newdawn.slick.AppGameContainer.start(AppGameContainer.java:314) at game.Tunneler.main(Tunneler.java:29) Here is my Game class: package game; import org.newdawn.slick.GameContainer; import org.newdawn.slick.Graphics; import org.newdawn.slick.SlickException; import org.newdawn.slick.state.BasicGameState; import org.newdawn.slick.state.StateBasedGame; import org.newdawn.slick.tiled.TiledMap; public class Game extends BasicGameState{ private int stateID = -1; private TiledMap map = null; public Game(int stateID){ this.stateID = stateID; } public void init(GameContainer container, StateBasedGame game) throws SlickException{ map = new TiledMap("data/maps/desert.tmx","maps");//ERROR } public void render(GameContainer container, StateBasedGame game, Graphics g) throws SlickException{ //map.render(0,0); } public void update(GameContainer container, StateBasedGame game, int delta) throws SlickException{ } public int getID(){return stateID;} } I've tried to see if anyone else has had similar problems but haven't turned up anything. I am able to load other files, so I don't believe it's a compiler issue. My menu class can load images and display them just fine. Also, the filepath is correct. Please let me know if you have any pointers that might help me sort this out.

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How can we protect the namespace of an object in Javascript?

- by Eduard Florinescu

Continuing from my previous question: Javascript simple code to understand prototype-based OOP basics Let's say we run into console this two separate objects(even if they are called child and parent there is no inheritance between them): var parent = { name: "parent", print: function(){ console.log("Hello, "+this.name); } }; var child = { name: "child", print: function(){ console.log("Hi, "+this.name); } }; parent.print() // This will print: Hello, parent child.print() // This will print: Hi, child temp =parent; parent = child; child = temp; parent.print() // This will now print: Hi, child child.print() // This will now print: Hello, parent Now suppose that parent is a library, as a HTML5 application in a browser this cannot do much harm because is practically running sandboxed, but now with the advent of the ChromeOS, FirefoxOS and other [Browser] OS they will also be linked to a native API, that would be a head out of the „sandbox”. Now if someone changes the namespace it would be harder for a code reviewer (either automated or not ) to spot an incorrect use if the namespaces changes. My question would be: Are there many ways in which the above situation can be done and what can be done to protect this namespaces? (Either in the javascript itself or by some static code analysis tool)

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When "W" is held, the character moves forward, but when "W" and "A" is held, movement completely stops

- by Vlad1k

I am making a 2D game, and when I hold the key "w", the player goes forward, but when I hold both "w" and "a", the movement stops completely, when I want it to go forward, while shifting to the left. Here is my script: var speed = 4; function Update() { // Make the character walk forward if "w" is being held if(Input.GetKey("w")) { rigidbody.velocity = transform.forward * speed; } // Stop the movement if "w" is not being held if(Input.GetKeyUp("w")) { rigidbody.velocity = transform.forward * 0; } // Make the character walk forward if "s" is being held if(Input.GetKey("s")) { rigidbody.velocity = transform.forward * -speed; } // Stop the movement if "s" is not being held if(Input.GetKeyUp("s")) { rigidbody.velocity = transform.forward * 0; } // Make the character walk left if "a" is being held if(Input.GetKey("a")) { rigidbody.velocity = transform.right * -speed; } // Stop the movement if "a" is not being held if(Input.GetKeyUp("a")) { rigidbody.velocity = transform.right * 0; } //Make the character walk right if "d" is being held if(Input.GetKey("d")) { rigidbody.velocity = transform.right * speed; } // Stop the movement if "d" is not being held if(Input.GetKeyUp("d")) { rigidbody.velocity = transform.right * 0; } } PLEASE MAKE THE CODE BETTER! I AM NEW! EDIT: Here is a video to show my problem. http://www.screenr.com/3oxH Here is the newest code: var speed = 4f; function Update() { if(Input.GetKey("w")) { rigidbody.velocity = transform.forward * speed; } else if(Input.GetKey("s")) { rigidbody.velocity = transform.forward * -speed; } else if(Input.GetKey("a")) { rigidbody.velocity = transform.right * -speed; } else if(Input.GetKey("d")) { rigidbody.velocity = transform.right * speed; } if(Input.GetKeyUp("w")) { rigidbody.velocity = transform.forward * 0; } if(Input.GetKeyUp("s")) { rigidbody.velocity = transform.forward * 0; } if(Input.GetKeyUp("a")) { rigidbody.velocity = transform.right * 0; } if(Input.GetKey("d")) { rigidbody.velocity = transform.right * speed; } if(Input.GetKeyUp("d")) { rigidbody.velocity = transform.right * 0; } }

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State of the art Culling and Batching techniques in rendering

- by Kristian Skarseth

I'm currently working with upgrading and restructuring an OpenGL render engine. The engine is used for visualising large scenes of architectural data (buildings with interior), and the amount of objects can become rather large. As is the case with any building, there is a lot of occluded objects within walls, and you naturally only see the objects that are in the same room as you, or the exterior if you are on the outside. This leaves a large number of objects that should be occluded through occlusion culling and frustum culling. At the same time there is a lot of repetative geometry that can be batched in renderbatches, and also a lot of objects that can be rendered with instanced rendering. The way I see it, it can be difficult to combine renderbatching and culling in an optimal fashion. If you batch too many objects in the same VBO it's difficult to cull the objects on the CPU in order to skip rendering that batch. At the same time if you skip the culling on the cpu, a lot of objects will be processed by the GPU while they are not visible. If you skip batching copletely in order to more easily cull on the CPU, there will be an unwanted high amount of render calls. I have done some research into existing techniques and theories as to how these problems are solved in modern graphics, but I have not been able to find any concrete solution. An idea a colleague and me came up with was restricting batches to objects relatively close to eachother e.g all chairs in a room or within a radius of n meeters. This could be simplified and optimized through use of oct-trees. Does anyone have any pointers to techniques used for scene managment, culling, batching etc in state of the art modern graphics engines?

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How to add locale aware CSS to an individual component in ADF Faces.

- by [email protected]

When creating a skin in ADF Faces, it's (relatively) easy to add locale aware CSS using the :rtl psuedo-class on the end of a skinning key. Example:af|inputListOfValues::content { padding-left: 3px;}af|inputListOfValues::content:rtl { padding-left: 0px; padding-right: 3px;}In this example, we want some padding before the start of the text in the content element of the component. In right to left locales, the start of the text is on the right side by default, so we need to change the padding from the left to the right.Let's say, however, that you want to specify a locale aware CSS style on an individual component using the contentStyle attribute. There is a handy ADF Faces EL function to help you out here: isRTL. For our example, let's say we want an inputText component whose text content is 'end' aligned. If you weren't considering RTL locales, you could code this as:<af:inputText id="idInputTextRight" label="right aligned" value="Test" contentStyle="text-align: right;"/>This, however, will be right aligned regardless of locale. This is where isRTL() comes to the rescue. This is how we would code this to be locale aware:<af:inputText id="idInputTextEnd" label="end aligned" value="Test" contentStyle="text-align: #{af:isRTL()?'left':'right'};"/> The af:isRTL() EL function returns true if we are rendering in RTL, so we can use it to pick the appropriate text alignment.

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