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• Iptables Allow MYSQL server incoming requests

  - by thompatry

  I am trying to get my new MediaWiki server to allow connections to our MySql Server and right now I cannot get my iptables firewall set up right for this. The rule I am applying is the following iptables -A INPUT -p tcp -d 129.130.155.39 --dport 3306 -j ACCEPT # MySQL But my iptables log is still show that the connections can not be established and is being blocked/denied. Nov 21 09:48:39 hds-it kernel: Firewall Deny: [OUTPUT] IN= OUT=eth1 SRC=129.130.155.210 DST=129.130.155.39 LEN=60 TOS=0x00 PREC=0x00 TTL=64 ID=29232 DF PROTO=TCP SPT=58862 DPT=3306 SEQ=914529531 ACK=0 WINDOW=14600 RES=0x00 SYN URGP=0 OPT (020405B40402080A03BCF2BC0000000001030307) When I turn off iptables, everything works as it should including editing the wiki database. What am I doing wrong with my rule.

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• Canadian English on Apple products

  - by thepurplepixel

  Apple is an American company. As many of you probably know, Canadian English is different from American English, and closer to British English (e.g. colour instead of color). I use iWork and Microsoft Office for Mac (along with many other applications on OS X), and OS X, nor my iPhone, have an option to switch to Canadian English. Yes, you can select Canadian English as an input language in the language bar, but any program that uses the central OS X spell checking (from Mail to Office to iWork to Chrome) will check words against an American English dictionary. I know asking a question that involves an iPhone component is borderline off-topic, but I know on my iPhone I can select British English, but that turns my $ into £ and has a few other weird spelling quirks. Simple question: Is it possible to make OS X (and maybe the iPhone) use a Canadian English dictionary for its spell checking? Because British English just doesn't cut it anymore. Thanks!

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• A simple example of movement prediction

  - by Daniel

  I've seen lots of examples of theory about the reason for client-side prediction, but I'm having a hard time converting it into code. I was wondering if someone knows of some specific examples that share some of the code, or can share their knowledge to shed some light into my situation. I'm trying to run some tests to get a the movement going (smoothly) between multiple clients. I'm using mouse input to initiate movement. I'm using AS3 and C# on a local Player.IO server. Right now I'm trying to get the Client side working, as I'm only forwarding position info with the client. I have 2 timers, one is an onEnterFrame and the other is a 100ms Timer, and one on mouseClick listener. When I click anywhere with a mouse, I update my player class to give it a destination point On every enterFrame Event for the player, it moves towards the destination point At every 100ms it sends a message to the server with the position of where it should be in a 100ms. The distance traveled is calculated by taking the distance (in Pixels) that the player can travel in one second, and dividing it by the framerate for the onEnterFrame handler, and by the update frequency (1/0.100s) for the server update. For the other Players, the location is interpolated and animated on every frame based on the new location. Is this the right way of doing it?

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• BizTalk 2009 - Error when Testing Map with Flat File Source Schema

  - by StuartBrierley

  I have recently been creating some flat file schemas using the BizTalk Server 2009 Flat File Schema Wizard.  I have then been mapping these flat file schemas to a "normal" xml schema format. I have not previsouly had any cause to map flat files and ran into some trouble when testing the first of these flat file maps; with an instance of the flat file as the source it threw an XSL transform error: Test Map.btm: error btm1050: XSL transform error: Unable to write output instance to the following <file:///C:\Documents and Settings\sbrierley\Local Settings\Temp\_MapData\Test Mapping\Test Map_output.xml>. Data at the root level is invalid. Line 1, position 1. Due to the complexity of the map in question I decided to created a small test map using the same source and destination schemas to see if I could pinpoint the problem.  Although the source message instance vaildated correctly against the flat file schema, when I then tested this simplified map I got the same error. After a time of fruitless head scratching and some serious google time I figured out what the problem was. Looking at the map properties I noticed that I had the test map input set to "XML" - for a flat file instance this should be set to "native".

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• Setting a wireless access point on Ubuntu server 11.10

  - by Solignis

  I am trying to setup a wifi access point with my Ubuntu server. I have managed to get my phone to connect the wireless and now it get a DHCP lease. Though it still cannot ping out or get pinged by anything on my network. I am prety sure my problem is iptables, but I not sure what would be wrong. Here is what my rules look like. (The ones pertaining to the bridge interface) # Allow traffic to / from wireless bridge interface iptables -A INPUT -i br0 -j ACCEPT iptables -A OUTPUT -o br0 -j ACCEPT I am guessing my rules are a little lean, the bridge exists on the same subnet as everything else on my network, I am using a 10.0.0.0/24 subnet. EDIT Oh yeah I should mention also, when I do a ping test, I get Destination Host Unreachable as the error.

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• CentOS 6 - iptables preventing web access via port 80

  - by bsod99

  I'm setting up a new web server with CentOS 6.2 and am not able to connect via the web. Everything looks set up correctly in httpd.conf and Apache is running, so I'm assuming it's an iptables issue. Is there anything in the following which could be causing the issue? # iptables -L Chain INPUT (policy ACCEPT) target prot opt source destination ACCEPT all -- anywhere anywhere state RELATED,ESTABLISHED ACCEPT icmp -- anywhere anywhere ACCEPT all -- anywhere anywhere ACCEPT tcp -- anywhere anywhere state NEW tcp dpt:ssh REJECT all -- anywhere anywhere reject-with icmp-host-prohibited ACCEPT tcp -- anywhere anywhere tcp dpt:http Chain FORWARD (policy ACCEPT) target prot opt source destination REJECT all -- anywhere anywhere reject-with icmp-host-prohibited Chain OUTPUT (policy ACCEPT)

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• ffmpeg volume parameter format

  - by tanon

  ffmpeg's -vol parameter is confusing me. 256 => normal (i guess meaning same as input volume, no change) 512 => (double the volume - read this somewhere). So what to do for 3 times the volume? 1.5 times the volume? Basically, lets say I have the max sound amplitudes (audacity levels) in 3 files as: 0.8 0.6 0.9 I want to amplify in the first two files, so that max=0.9 in all files. What parameters of -vol I would use?

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• How can I choose a Webapp UI Design/dev collaborative tool?

  - by Cheeso

  I am working with a team that's building a webapp for internal use in an enterprise. It's basically a workflow app at heart, where there's a single "request". Each request flows through various stages, and at each stage, there's a person or role that is responsible for moving the request to the next stage. "Moving" the request to the next stage might involve adding more data, validating things, gathering input from some external source and correlating it to the data in the request, and so on. The workflow engine has been selected. The UI for the various roles and stakeholders is being designed. We have a distributed group of stakeholders. I'd like to employ a collaborative design/dev effort, where devs can produce and stand-up mockups or even working prototypes, then solicit feedback on those things. In a centralized team this could be done via design review meetings, with everyone gathered round a screen projector. That just is not going to work for us. So what I'd like is an app that can help with this. Any recommendations on apps or how to choose?

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• System in low graphics, deleted linux, grub rescue, can't access windows

  - by First timer

  So I'm pretty new to Ubuntu but I managed to install it with no big problems on both my desktop and netbook. When I installed it on my brother's netbook everything went horribly wrong and now I fear the system is close to beyond repair. The problem was first that it said it did not have any space left (seemed ridiculous since it had a lot). Then Ubuntu began booting into a "System is running in low graphics mode error" which I then tried to fix, using all the tips I could find in here but nothing helped. I think the graphics error and lack of space might have been related but I can't be sure. Finally I gave up repairing Ubuntu and went for a reinstall. Shouldn't have done that! I read that I should simply open Ubuntu through a live usb and choose GParted to delete the Linux partitions so I did and rebooted accordingly. Next, I was to install Ubuntu but now I am only given the option to wipe the whole disk for Ubuntu, not install along with windows 7. If I access GParted I can still see the ntfs partitions that hold windows 7 (there are 2: one labeled RECOVERY and another labeled OS and boot) so why can't I access them? Btw. the OS and boot has a little red mark with a warning that 1 cluster is referenced to multiple times, don't know what that means. If I boot without the live usb I am sent directly into a grub rescue "black screen of the computer will follow no orders". Please, I know that the easiest might be to simply wipe the whole thing clean but there are important files and programs on windows 7. Is there a way to just access windows? It is a dell inspiron 1018 mini netbook, so I have no cd input and no windows 7 installation cd.

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• Better way to go up/down slope based on yaw?

  - by CyanPrime

  Alright, so I got a bit of movement code and I'm thinking I'm going to need to manually input when to go up/down a slope. All I got to work with is the slope's normal, and vector, and My current and previous position, and my yaw. Is there a better way to rotate whether I go up or down the slope based on my yaw? Vector3f move = new Vector3f(0,0,0); move.x = (float)-Math.toDegrees(Math.cos(Math.toRadians(yaw))); move.z = (float)-Math.toDegrees(Math.sin(Math.toRadians(yaw))); move.normalise(); if(move.z < 0 && slopeNormal.z > 0 || move.z > 0 && slopeNormal.z < 0){ if(move.x < 0 && slopeNormal.x > 0 || move.x > 0 && slopeNormal.x < 0){ move.y += slopeVec.y; } } if(move.z > 0 && slopeNormal.z > 0 || move.z < 0 && slopeNormal.z < 0){ if(move.x > 0 && slopeNormal.x > 0 || move.x < 0 && slopeNormal.x < 0){ move.y -= slopeVec.y; } } move.scale(movementSpeed * delta); Vector3f.add(pos, move, pos);

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• receiving "command not found" error messages after fresh reinstall of Lubuntu 14.04

  - by user236378

  Lubuntu 14.04 was working really great. . .until I messed up and had to do a complete fresh reinstall. Now I receive error messages when I input commands into the Terminal, even after immediately completing the fresh install. For example I type: sudo leafpad ?/etc/default/ or sudo leafpad ?/etc/default/grub I get: sudo: leafpad: command not found I type: sudo update-initramfs ?-u or sudo update-grub I get: sudo: update-initramfs: command not found or sudo: update-grub: command not found If I use the command mkdir I get: mkdir: command not found I also get this same exact error message, command not found, with sudo apt-get and wget In other words I can't do anything that I was able to do when inputting commands into the terminal. So I cannot add any repositories or update anything at all. I am not really sure what is causing the problem(s). It appeared to me that Lubuntu installed and booted up OK. However just as soon as I enter anything into the Terminal I immediately get the above error messages. I have tried to do the reinstall three times, same error messages. If anyone can suggest any fixes I would really appreciate it very much. Thank you!

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• Excel Extending Equations

  - by Richard

  So I have an excel table that is multiply 1 value against several other values. It looks like this: So I want the equations inside cells C14 to F14 to be B14*C5, B14*C6, B14*C7, B14*C8 respectively. So I can obviously do that manually but I want to learn the faster way. So I know I should use absolute reference for B14, so I can input =$B$14*C5 for cell C14. But then when I do the CTRL extend method where you put the cursor on the bottom right corner of the cell and hold CTRL while you extend the cells. The problem is since I am extending the equation in B14 horizontally to F14, it is incrementing the equation horizontally. So the equation in D14 becomes =$B$14*D5 instead of =$B$14*C6. So how exactly do I increment the equation downwards while I extend the equation horizontally?

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• Mouse Speed in GLUT and OpenGL?

  - by CroCo

  I would like to simulate a point that moves in 2D. The input should be the speed of the mouse, so the new position will be computed as following new_position = old_position + delta_time*mouse_velocity As far as I know in GLUT there is no function to acquire the current speed of the mouse between each frame. What I've done so far to compute the delta_time as following void Display() { glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); glColor3f(1.0f, 0.0f, 0.0f); static int delta_t, current_t, previous_t; current_t = glutGet(GLUT_ELAPSED_TIME); delta_t = current_t - previous_t; std::cout << delta_t << std::endl; previous_t = current_t; glutSwapBuffers(); } Where should I start from here? (Note: I have to get the speed of the mouse because I'm modeling a system) Edit: Based on the above code, delta_time fluctuates so much 34 19 2 20 1 20 0 16 1 1 10 21 0 13 1 19 34 0 13 0 6 1 14 Why does this happen?

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• License validation and calling home

  - by VitalyB

  I am developing an application that, when bought, can be activated using a license. Currently I am doing offline validation which is a bit troubling to me. I am aware there is nothing to do against cracks (i.e modified binaries), however, I am thinking to trying to discourage license-key pirating. Here is my current plan: When the user activates the software and after offline validation is successful, it tries to call home and validate the license. If home approves of the license or if home is unreachable, or if the user is offline, the license gets approved. If home is reached and tells the license is invalid, validation fails. Licensed application calls home the same way every time during startup (in background). If license is revoked (i.e pirated license or generated via keygen), the license get deactivated. This should help with piracy of licenses - An invalid license will be disabled and a valid license that was pirated can be revoked (and its legal owner supplied with new license). Pirate-users will be forced to use cracked version which are usually version specific and harder to reach. While it generally sounds good to me, I have some concerns: Users tend to not like home-calling and online validation. Would that kind of validation bother you? Even though in case of offline/failure the application stays licensed? It is clear that the whole scheme can be thwarted by going offline/firewall/etc. I think that the bother to do one of these is great enough to discourage casual license sharing, but I am not sure. As it goes in general with licensing and DRM variations, I am not sure the time I spend on that kind of protection isn't better spent by improving my product. I'd appreciate your input and thoughts. Thanks!

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• A generic Re-usable C# Property Parser utility [on hold]

  - by Shyam K Pananghat

  This is about a utility i have happened to write which can parse through the properties of a data contracts at runtime using reflection. The input required is a look like XPath string. since this is using reflection, you dont have to add the reference to any of your data contracts thus making pure generic and re- usable.. you can read about this and get the full c# sourcecode here. Property-Parser-A-C-utility-to-retrieve-values-from-any-Net-Data-contracts-at-runtime Now about the doubts which i have about this utility. i am using this utility enormously i many places of my code I am using Regex repeatedly inside a recursion method. does this affect the memmory usage or GC collection badly ?do i have to dispose this manually. if yes how ?. The statements like obj.GetType().GetProperty() and obj.GetType().GetField() returns .net "object" which makes difficult or imposible to introduce generics here. Does this cause to have any overheads like boxing ? on an overall, please suggest to make this utility performance efficient and more light weight on memmory

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• My Tablet PC has a jog dial (typically used for scrolling up and down) but it does not work by defau

  - by techtechmo

  I have an HP Compaq TC4400 and I recently was able to make most of the Tablet PC functions work in Ubuntu 9.10. (The step-by-step guide can be found in my blog.) Unfortunately I have yet to make the jog dial work. This would be particularly useful for scrolling up and down websites and documents when the TC4400 is in slate mode (with no access to the keyboard). I would be much obliged if anybody could tell me: How to find out the input button/key assignment that Ubuntu 9.10 has for jog-up and jog-down; How to assign jog-up to scroll up (D-pad key UP, or PAGE UP) and jog-down to scroll down (D-Pad key DOWN, or PAGE DOWN). I am using xbindkeys to assign different shortcuts to the quick launch buttons, perhaps I could use the same program for the jog dial? I would have done that, except I do not know how to find the proper button/key assignment for xbindkeys to use. Thanks in advance!

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• Entiity System with C++

  - by Dono

  I'm working on a game engine using the Entity System and I have some questions. How i see Entity System : Components : A class with attributs, set and get. Sprite Physicbody SpaceShip ... System : A class with a list of components. (Component logic) EntityManager Renderer Input Camera ... Entity : Just a empty class with a list of components. What i've done : Currently, i've got a program who allow me to do that : // Create a new entity/ Entity* entity = game.createEntity(); // Add some components. entity->addComponent( new TransformableComponent() ) ->setPosition( 15, 50 ) ->setRotation( 90 ) ->addComponent( new PhysicComponent() ) ->setMass( 70 ) ->addComponent( new SpriteComponent() ) ->setTexture( "name.png" ) ->addToSystem( new RendererSystem() ); My questions Did the system stock a list of components or a list of entities ? In the case where I stock a list of entities, I need to get the component of this entities on each frame, that's probably heavy isn't it ? Did the system stock a list of components or a list of entities ? In the case where I stock a list of entities, I need to get the component of this entities on each frame, that's probably heavy isn't it ?

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• Unable to diagnose Windows 7 lockup

  - by Delyan

  Basic info: Laptop Dell Studio XPS 13 (Intel P9600, 4GB RAM, NVidia 9400M card, 256G Samsung PM800 SSD) Windows 7 Ultimate, as well as Fedora 14 Here's the deal - Windows would just lock up out of nowhere, no log entries, no dumps, no BSOD, it just freezes. This happens mostly when idle (but it happened when I was using it too) and does not follow a concrete time frame. No input is accepted - only solution is to hold the power button. Although this sounds like a clean cut hardware issue, the reason I'm willing to rule this out is that my primary OS is Fedora 14. It's been working fine for the past 2 years and I've been stress testing the hardware (intentionally or not) every once in a while with no issues. I would like to ask if there's any way to get a diagnostic output from Windows in a situation such as this. The next step in my testing is to leave it in Safe Mode overnight and see if it locks up but even if I do that, I still need to figure out what component freezes it up during normal operation.

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• Digital HD Transition

  - by Bill Evjen

  The HD Experience Roughly 53% of the viewing public has HD capable devices in their home 24% think they are watching HD while they have no subscription to any HD content Today’s HD Considerations Choices abound: format resolution – 720p, 1080i/p frame rates compression and wrapping audio compression and delivery metadata packaging, delivery, and usage content delivery protocols Metadata is going to be a part of the overall experience With emerging technologies: Super Hi-Vision (SHV, UHDTV 4320p), 3D HEVC/H.265, WEBM/VP8 HDBaseT, P2PTV Dolby Pulse/HE-AAC Industry standardization Metadata registration, packaging, and delivery standards Improved picture and sound quality is a logical next step but we need to also think about the end to end viewing experience including; 3D video and audio content Mixed-mode viewing to bring interactive and immersive experiences Content Transportability both on-to and off-of the aircraft High Definition Standardization Analog switch off around the world DTV transition completed: 17 countries DTV transition in progress: 45 countries The EU has mandated the end of 2012 as the final date for Analog Switch Off D-Cinema was standardized by SMPTE in 2006 Airlines are installing HD displays today Passengers are bringing their own devices now HD TV on airlines are getting bigger and bigger – bigger than SD was – now up to 23” Gray scale data input for color – 6 to 8 bit Contrast – 400 to 700 Backlit – LED Encryption – can it be the same for HD? PPV in the cabin?

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• How to avoid copying corrupted files with rsync

  - by Roberto Aloi

  I have an HDD with plenty of files, some of which are unfortunately corrupted. I'm now trying to copy the good files into a new HDD. I'm using: rsync -azP SRC TGT When rsync comes to one of the corrupted files, I can see a message in the console: rsync: read errors mapping XXX: Input/output error (5) In the target folder, I still see the corrupted file, which I'm not able to open and which I have to delete manually. Is there any option to tell rsync not to copy files after a i/o error?

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• hd0 out of disk error results to low graphics mode

  - by msPeachy

  Yesterday, I have reinstalled Ubuntu due to a error: hd0 out of disk on boot. Everything went fine, I've installed apps, perform updates and upgraded the kernel. I've even restarted it a few times just to check if I would encounter boot issues and was glad that everything was working perfectly, then powered it down. The next morning when I boot, I got this error: hd0 out of disk error. Press any key to continue... again! After pressing a key, it took 10 minutes for the Ubuntu logo to appear with it's 5 dots. After another 5 minutes, Ubuntu started checking the disk and displayed a message that / has errors, I pressed F to fix the errors. After which Ubuntu tells me that /tmp is not yet ready for mounting so I pressed S to skip mounting it, then Ubuntu restarted. On boot I saw the error: hd0 out of disk error. Press any key to continue... again. This time it took only a minute for the Ubuntu logo to appear and after another minute a dialog box appeared with the following message: The system is running in low-graphics mode. Your screen, graphics card, and input settings could not be detected correctly. You will have to configure these yourself. What would you like to do? Run in low-graphics mode for just one session Reconfigure graphics Troubleshoot the error Exit to console login Whichever option I choose I ended up with a console prompt: grub-editenv: error: cannot read the file /boot/grub/grubenv. _ I can't do anything on this console, whatever I type nothing happens. I've rebooted several times and I get same error every time. I don't quite understand what is wrong with Ubuntu or with my installation. I've encountered this hd0 out of disk error several times already and always ended up reinstalling. I'd really really appreciate it if you guys can help me fix this. Thank you and good day.

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• What is the value to checking in broken unit tests?

  - by Adam W.

  While there are ways of keeping unit tests from being executed, what is the value of checking in broken unit tests? I will use a simple example. Case sensitivity. The current code is Case Sensitive. A valid input into the method is "Cat" and it would return an enum of Animal.Cat. However, the desired functionality of the method should not be case sensitive. So if the method described was passed "cat" it could possibly return something like Animal.Null instead of Animal.Cat and the unit test would fail. Though a simple code change would make this work, a more complex issue may take weeks to fix, but identifying the bug with a unit test could be a less complex task. The application currently being analyzed has 4 years of code that "works". However, recent discussions regarding unit tests has found flaws in the code. Some just need explicit implementation documentation (ex. case sensitive or not), or code that does not execute the bug based on how it is currently called. But unit tests can be created executing specific scenarios that will cause the bug to be seen and are valid inputs. What is the value of checking in unit tests that exercise the bug until someone can get around to fixing the code? Should this unit test be flagged with ignore, priority, category etc, to determine whether a build was successful based on tests executed? Eventually the unit test should be created to execute the code once someone fixes it. On one hand it shows that identified bugs have not been fixed. On the other, there could be hundreds of failed unit tests showing up in the logs and weeding through the ones that should fail vs. failures due to a code check-in would be difficult to find.

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• Outlook 2010 sharing calendars and updating

  - by Stef

  We recently purchased Outlook 2010 for our law firm. We have several secretaries that need to view all calendars and input information in each of them. We do not have Exchange. I did a test by creating a calendar on one computer and sharing it with another computer. On the second computer I created a calendar and shared it with the first computer. Everything seems to work, except when I put events on computer 1 calendar and look at computer 1 calendar on computer 2. I can not see anything. Any advice would help. Thanks

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• IPtables Traffic Quota - up and down

  - by Nick

  I've been trying to set up traffic quotas for users on a shared server and i believe [with my limited knowledge] that iptables --quota and ports which have been selected for each user [--dport] is the way to do this... iptables -A OUTPUT --dport 1,2,3,4... --quota 123412341234 -j ACCEPT iptables -A OUTPUT --dport 1,2,3,4... -j DROP I think something like this would work to limit the traffic [and reset every month] but its only for traffic going out. Is there something I could do to combine -A OUTPUT and -A INPUT into one quota? Or, is there a different method I could use to achieve the same thing more efficiently? OS is debian squeeze Thanks.

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• Can a candidate be judged by asking to write a complex program on "paper"?

  - by iammilind

  Sometime back in an interview, I was asked to write following program: In a keypad of a mobile phone, there is a mapping between number and characters. e.g. 0 & 1 corresponds to nothing; 2 corresponds to 'a','b','c'; 3 corresponds to 'd','e','f'; ...; 9 corresponds to 'w','x','y','z'. User should input any number (e.g. 23, 389423, 927348923747293) and I should store all the combinations of these character mapping into some data structure. For example, if user enters "23" then possible character combinations are: ad, ae, af, bd, be, bf, cd, ce, cf or if user enters, "4676972" then it can be, gmpmwpa, gmpmwpb, ..., hnroxrc, ..., iosozrc Interviewer told that people have written code for this within 20-30 mins!! Also he insisted I have to write on paper. If I am writing a code then my tendency is as of I am writing production code, even though it may not be expected from me. So, I always try to think all the aspects like, optimization, readability, maintainability, extensible and so on. Considering all these, I felt that I should be writing on PC and it needs decent 2 hours. Finally after 25 mins, I was able to come up with just the concept and some shattered pieces of code (not to mention of my rejection). My question is not the answer for the above program. I want to know that is this a right way to judge the caliber of a person ? Am I wrong / too slow in the estimates ? Am I too idealistic ?

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