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Articles indexed Friday January 14 2011

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• how to copy photos in ipad to my pc?

  - by davidshen84

  hi, i used the iTune to sync my photos to my ipad. but now, i lost the copies of the photos on my pc, so i want to restore them back from my ipad. but from the storage folder that ipad exposed, i cannot find my photos. and i am not sure if the photo sync function in iTune can sync the photos on my ipad to my pc, because it seems it can only sync stuffs from pc to ipad. i am not sure if jail break the ipad can help me.

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• Enter / Return key stops working

  - by andygrunt

  I have a Dell Latitude E5400 laptop running Windows 7. Everything runs fine on it for days then I suddenly notice the enter/return key is no longer working e.g. I could be writing an email, press enter for a new line but it doesn’t ‘register’ – so no new line. I thought it might be some dirt under the key perhaps so I tried running the Windows onscreen keyboard but the Enter key on that doesn’t work either. A reboot always fixes the problem but it’s a pain. Any ideas a) how to fix it and b) out of interest, is there some other key combination that I can use as an alternative to using the Enter key when I need to?

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• Is it safe to operate a laptop without battery?

  - by leladax

  I know it's 'unsafe' in terms of data loss but I noticed motherboards still have some of their circuits on power when they are plugged in [e.g. a circuit that must wait for power-on signals is certainly one of them]. Hence, I wondered if it would increase the life of the laptop if the battery was simply off. Let alone that may also increase battery life, but that's the least of my concerns. Notice the main point is to plug it off on hibernate and have no power source whatsoever for the duration of being off (apart from the clock battery). (i.e. saving having to plug off the battery every time)

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• Ubuntu and Belkin N150 f6d4050 Wireless USB adapter v2

  - by Andrew

  I'm new to Ubuntu, and I'm trying to get my Belkin USB adapter to work. There are plenty of discussions out there already about this, but none really helped me out. Here's what I've done - Installed ndiswrapper Installed ndisgtk Installed the driver (rt2870.inf) via ndisgtk ndisgtk reported that the driver was installed and the hardware was present. The green light on the adapter is solid green, which I assume means that Ubuntu is aware of it's presence. However, when I click the little wireless symbol at the navigation bar, there's no option to choose my adapter (assuming that it's supposed to show up there...) My adapter version is F6D4050 - Where do I go from here? I'm a Ubuntu newb, so speak slowly. :P lsusb - andrew@ubuntu:~$ lsusb Bus 002 Device 003: ID 046d:c517 Logitech, Inc. LX710 Cordless Desktop Laser Bus 002 Device 002: ID 04f9:0229 Brother Industries, Ltd Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 001 Device 004: ID 050d:935b Belkin Components Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub lsmod - andrew@ubuntu:~$ lsmod Module Size Used by binfmt_misc 7960 1 fbcon 39270 71 tileblit 2487 1 fbcon font 8053 1 fbcon bitblit 5811 1 fbcon softcursor 1565 1 bitblit vga16fb 12757 0 vgastate 9857 1 vga16fb snd_cmipci 37557 2 snd_intel8x0 31155 2 snd_ac97_codec 125394 1 snd_intel8x0 ac97_bus 1450 1 snd_ac97_codec snd_mpu401 6875 0 snd_pcm_oss 41394 0 snd_mixer_oss 16299 1 snd_pcm_oss snd_pcm 87882 4 snd_cmipci,snd_intel8x0,snd_ac97_codec,snd_pcm_oss snd_opl3_lib 10846 1 snd_cmipci snd_hwdep 6924 1 snd_opl3_lib snd_mpu401_uart 6857 2 snd_cmipci,snd_mpu401 snd_seq_dummy 1782 0 snd_seq_oss 31219 0 snd_seq_midi 5829 0 snd_rawmidi 23420 2 snd_mpu401_uart,snd_seq_midi snd_seq_midi_event 7267 2 snd_seq_oss,snd_seq_midi snd_seq 57481 6 snd_seq_dummy,snd_seq_oss,snd_seq_midi,snd_seq_midi_event nouveau 515227 2 ttm 60847 1 nouveau snd_timer 23649 3 snd_pcm,snd_opl3_lib,snd_seq snd_seq_device 6888 6 snd_opl3_lib,snd_seq_dummy,snd_seq_oss,snd_seq_midi,snd_rawmidi,snd_seq ns558 3704 0 ppdev 6375 0 drm_kms_helper 30742 1 nouveau joydev 11072 0 ndiswrapper 244768 0 gameport 10966 3 snd_cmipci,ns558 usblp 12407 0 asus_atk0110 10033 0 parport_pc 29958 1 serio_raw 4918 0 drm 199204 4 nouveau,ttm,drm_kms_helper i2c_algo_bit 6024 1 nouveau edac_core 45423 0 edac_mce_amd 9278 0 k8temp 3912 0 snd 71106 23 snd_cmipci,snd_intel8x0,snd_ac97_codec,snd_mpu401,snd_pcm_oss,snd_mixer_oss,snd_pcm,snd_opl3_lib,snd_hwdep,snd_mpu401_u art,snd_seq_oss,snd_rawmidi,snd_seq,snd_timer,snd_seq_device soundcore 8052 1 snd snd_page_alloc 8500 2 snd_intel8x0,snd_pcm i2c_nforce2 6099 0 lp 9336 0 parport 37160 3 ppdev,parport_pc,lp hid_logitech 8820 0 ff_memless 5109 1 hid_logitech ohci1394 30260 0 usbhid 41084 1 hid_logitech hid 83440 2 hid_logitech,usbhid usb_storage 49833 0 skge 41049 0 ieee1394 94771 1 ohci1394 sata_sil 8895 0 forcedeth 55592 0 sata_nv 23778 1 pata_amd 11962 1 floppy 63156 0

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• pdftk issue after updating Ubuntu from 9.04 to 9.10

  - by Crazydog

  We upgraded our server to 9.10 from 9.04 the other day, and it all went well except for one rather important program. We're using pdftk to automatically generate filled out pdf forms. On 9.04, it worked just fine. After updating to 9.10, the pdf forms would no longer be filled out - they'd just be empty. I discovered that if I try to create an fdf file via pdftk from my PDF form, it just creates an empty fdf with no fields. On windows, pdftk generates the fdf file just fine. Any ideas? Thanks.

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• Extracting metadata from flac header in linux

  - by Tommy Fisk

  Hello. I recently (and accidentally) wiped a hard-drive which should NOT have been formatted. Thankfully, PhotoRec was able to recover some of the most important files from the disk. Part of those files include a large music collection of flac files. I've placed these in a folder named 'FLAC' that looks like this: [Start of FLAC Folder] f11655088.flac f11698672.flac ... (around 2,000 files total) f291142600.flac [End of FLAC Folder] I'm running a livecd to rescue this data. I have access to a standard terminal in Ubuntu 10.10. I've noticed that the music player in linux will display the song title when I open any of these songs. My goal is to automatically extract the song title from these files and update their names from f12313512.flac to 'Libera - Rebirth.flac' - or whatever the song title happens to be. Thanks in advance for suggestions on how I might accomplish this!

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• Good references to know why has my computers stopped responding me

  - by Peterstone

  Hello all! I´m a windows xp user (but not for much time...) and I usually see how my computer stop of responding me. The process is this: Firsly it became totally stopped or very slow for certain periods of 5 minutes. How could I do? After that it gets stopped (Even not totally because If I click on the bar I see a blinking response in the bar botton of the program I click on. It´s could be anything related with security (like the firewall or some virus)? Computer university: I usually experience this, using Matlab (R2007a) with System Generator (its respective compatible version) My personal laptop: It´s usually works well but when stopped periods became to appears I know in not much time it will became totally stopped. I usually see how Word 2007 get stopped and after a while my windows xp gets stopped. (well I can access to the the manage task pressing ctr+alt and...). The only solution I see is to kill program by program... My petition: Please, I need good references that help me how to think in order to avoid or to manage the problems previously described. Does anyone know usefull books or articles? EDIT: Laptop: OS: XP Home Edition Version 2002 SP3 Hardware: HP Mini Intel(R)Atom(TM) CPU N270 @1,60GHz 1.99 GB RAM University Computer: OS: XP Profesional SP3 Hardware: AMD Athlon(tm) XP 1800+ 1.54 GHz, 768 MB RAM

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• Disable word completion dialog when pressing escape in Safari

  - by Peter

  Behavior: Load Safari 5.0 on mac. Press command+f to search for some text. Type something, and find it on the page. Hit esc to cancel the search. Irritatingly, get word completion menu rather than canceling. Is there any way to make esc cancel the search, like it used to with Safari 4.0, instead of pulling up a word completion dialog? It's very annoying. Failing that, what's the best way to cancel the search with the keyboard? Note: this also happens in any text field, the search box, the location bar etc.

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• Adobe s'associe à Google et Mozilla pour corriger un bogue, qui permettait de restaurer des cookies supprimés via Flash Player

  Adobe s'associe à Google et Mozilla pour corriger un bogue, qui permettait de restaurer des cookies supprimés via Flash Player Les LSO (Local Storage Objects) en place dans le Flash Player d'Adobe, peuvent être diablement utiles : stockage de diverses informations évitant d'avoir à les ressaisir, ou de perdre des données en ligne (travail en cours dans une application, identifiants, historique, etc.). Mais chaque médaille à son revers, surtout lorsqu'il est question de laisser des sites et des logiciels retenir des informations. Déjà, ces derniers peuvent être utilisés pour la restauration de cookies de navigateur qui avaient été supprimés. De quoi récupérer des données permettant de tracker un internaute. Adobe a do...

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• Intel prévoit de lancer des smartphones tournant sous Windows 8, contrairement aux voeux de Microsoft

  Intel prévoit de lancer des smartphones tournant sous Windows 8, contrairement aux voeux de Microsoft Juste après avoir annoncé ses profits records pour 2010, Intel a donné quelques informations sur son futur, et une partie de celui-ci sera lié à Microsoft. En effet, Paul Otellini (CEO de la compagnie) a réagit au portage de la prochaine génération de Windows sur la plateforme ARM, action dans laquelle il perçoit des avantages pour sa propre société. "Le plus pour Intel, c'est qu'avec l'unification de leurs systèmes d'exploitation, nous avons désormais pour la première fois avoir un OS tactile pour tablettes compatible avec nos produits. Nous pourrons insérer nos processeurs low-power tournant sous Windows 8 dans des téléphone...

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• Is there a good example of the difference between practice and theory?

  - by a_person

  There has been a lot of posters advising that the best way to retain knowledge is to apply it practically. After ignoring said advice for several years in a futile attempt to accumulate enough theoretical knowledge to be prepared for every possible case scenario, the process which lead me to assembling a library that's easily worth ~6K, I finally get it. I would like to share my story in the hopes that others will avoid taking the same route that was taken by me. I've selected graphical format (photos with caption to be exact) as my media. Help me with your ideas, maybe a fragment of code, or other imagery that would convey a message of the inherent difference between practice and theory.

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• Social-network, online community, company and job reviews, salaries statistics and much more.. Do we have it? Do we need it?

  - by Vlad Lazarenko

  I have many friends from Ukraine who are programmers. So I found out that they have a web site that collects, organizes and analyzing information about IT companies, which includes location, feedbacks, company reviews from current and former employees etc. They also collect programming salaries and organize them by language, region etc. That web site is ran by programmers and for programmers, all information is absolutely public and free. Plus, web site has forums, and people can discuss (more or less social than specific programming stuff) things, publish articles, news etc. I personally think that is useful, especially for those who are new in this industry. For example, you may do a small research and find out that, for example, Java programmers getting paid more than PHP programmers but demand is lower. Or you get an offer from the company, is about to accept it, but read reviews and find out that they don't even provide internet access at work and if you need to download something, you have to ask your manager to do it for you, and managers share a single computer that has internet connection to get that stuff for you (there is only one such company in Kiev, Ukraine, called SMK, for Software Mac Kiev, a big shame). So the question is - do we have something like it in US? Or at least, say, for New York region? Or state? All information I managed to find online is inaccurate or not full. Forums are very specific. If we don't have it, would you be interested in creating such a portal? Thanks!

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• What emulation mode for an epson printer is best?

  - by deamon

  I'm looking for a color duplex printer for Ubuntu. My favourites are Epson B-310N and Brother HL 4050CDN. The latter should be work with linux, but I'd prefer the first one, because printing costs are cheaper. The epson printer has "Epson ESC/P Raster", "PCL3", and "Epson ESC/P2" emulation. Can I use the printer with one of those emulations under linux? Were there any restrictions (like unusable duplex)?

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• Garbled display after Ubuntu upgrade to 2.6.32-2* kernel

  - by Matthias

  I was running Ubuntu 9 (Karmic Koala) with no problems. I recently upgraded to Ubuntu 10 (Lucid Lynx) and cannot use it normally. After I log in, the screen scrambles (a purple/green mess)--impossible to see anything, although I can get out by marking the spot on the screen to click for a restart, so Linux is working behind the scenes. If I start in recovery mode with basic graphics, I have no problems at all (other than limited functionality). If I start the old 2.6.31-22 kernel, I see a bunch of "unmountable" errors in the startup script, but I can use Linux normally with no apparent problems. I'm running an IBM ThinkPad A30 with ATI Mobility graphics. Just to reiterate, the screen looks normal until I log in, at which point it goes bonkers. What do I need to change in order to fix this?

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• Starcraft 2 - Third Person Custom Map

  - by Norla

  I would like to try my hand at creating a custom map in Starcraft 2 that has a third-person camera follow an individual unit. There are a few custom maps that exist with this feature already, so I do know this is possible. What I'm having trouble wrapping my head around are the features that are new to the SC2 map editor that didn't exist in the Warcraft 3 editor. For instance, to do a third-person map, do I need a custom mods file, or can everything be done in the map file? Regardless, is it worth using a mod file? What map settings do I NEED to edit/implement? Which are not necessary, but recommended?

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• OpenGL 3 and the Radeon HD 4850x2

  - by rotard

  A while ago, I picked up a copy of the OpenGL SuperBible fifth edition and slowly and painfully started teaching myself OpenGL the 3.3 way, after having been used to the 1.0 way from school way back when. Making things more challenging, I am primarily a .NET developer, so I was working in Mono with the OpenTK OpenGL wrapper. On my laptop, I put together a program that let the user walk around a simple landscape using a couple shaders that implemented per-vertex coloring and lighting and texture mapping. Everything was working brilliantly until I ran the same program on my desktop. Disaster! Nothing would render! I have chopped my program down to the point where the camera sits near the origin, pointing at the origin, and renders a square (technically, a triangle fan). The quad renders perfectly on my laptop, coloring, lighting, texturing and all, but the desktop renders a small distorted non-square quadrilateral that is colored incorrectly, not affected by the lights, and not textured. I suspect the graphics card is at fault, because I get the same result whether I am booted into Ubuntu 10.10 or Win XP. I did find that if I pare the vertex shader down to ONLY outputting the positional data and the fragment shader to ONLY outputting a solid color (white) the quad renders correctly. But as SOON as I start passing in color data (whether or not I use it in the fragment shader) the output from the vertex shader is distorted again. The shaders follow. I left the pre-existing code in, but commented out so you can get an idea what I was trying to do. I'm a noob at glsl so the code could probably be a lot better. My laptop is an old lenovo T61p with a Centrino (Core 2) Duo and an nVidia Quadro graphics card running Ubuntu 10.10 My desktop has an i7 with a Radeon HD 4850 x2 (single card, dual GPU) from Saphire dual booting into Ubuntu 10.10 and Windows XP. The problem occurs in both XP and Ubuntu. Can anyone see something wrong that I am missing? What is "special" about my HD 4850x2? string vertexShaderSource = @" #version 330 precision highp float; uniform mat4 projection_matrix; uniform mat4 modelview_matrix; //uniform mat4 normal_matrix; //uniform mat4 cmv_matrix; //Camera modelview. Light sources are transformed by this matrix. //uniform vec3 ambient_color; //uniform vec3 diffuse_color; //uniform vec3 diffuse_direction; in vec4 in_position; in vec4 in_color; //in vec3 in_normal; //in vec3 in_tex_coords; out vec4 varyingColor; //out vec3 varyingTexCoords; void main(void) { //Get surface normal in eye coordinates //vec4 vEyeNormal = normal_matrix * vec4(in_normal, 0); //Get vertex position in eye coordinates //vec4 vPosition4 = modelview_matrix * vec4(in_position, 0); //vec3 vPosition3 = vPosition4.xyz / vPosition4.w; //Get vector to light source in eye coordinates //vec3 lightVecNormalized = normalize(diffuse_direction); //vec3 vLightDir = normalize((cmv_matrix * vec4(lightVecNormalized, 0)).xyz); //Dot product gives us diffuse intensity //float diff = max(0.0, dot(vEyeNormal.xyz, vLightDir.xyz)); //Multiply intensity by diffuse color, force alpha to 1.0 //varyingColor.xyz = in_color * diff * diffuse_color.xyz; varyingColor = in_color; //varyingTexCoords = in_tex_coords; gl_Position = projection_matrix * modelview_matrix * in_position; }"; string fragmentShaderSource = @" #version 330 //#extension GL_EXT_gpu_shader4 : enable precision highp float; //uniform sampler2DArray colorMap; //in vec4 varyingColor; //in vec3 varyingTexCoords; out vec4 out_frag_color; void main(void) { out_frag_color = vec4(1,1,1,1); //out_frag_color = varyingColor; //out_frag_color = vec4(varyingColor, 1) * texture(colorMap, varyingTexCoords.st); //out_frag_color = vec4(varyingColor, 1) * texture(colorMap, vec3(varyingTexCoords.st, 0)); //out_frag_color = vec4(varyingColor, 1) * texture2DArray(colorMap, varyingTexCoords); }"; Note that in this code the color data is accepted but not actually used. The geometry is outputted the same (wrong) whether the fragment shader uses varyingColor or not. Only if I comment out the line varyingColor = in_color; does the geometry output correctly. Originally the shaders took in vec3 inputs, I only modified them to take vec4s while troubleshooting.

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• How Can I Improve This Card-Game AI?

  - by James Burgess

  Let me get this out there before anything else: this is a learning exercise for me. I am not a game developer by trade or hobby (at least, not seriously) and am purely delving into some AI- and 3D-related topics to broaden my horizons a bit. As part of the learning experience, I thought I'd have a go at developing a basic card game AI. I selected Pit as the card game I was going to attempt to emulate (specifically, the 'bull and bear' variation of the game as mentioned in the link above). Unfortunately, the rule-set that I'm used to playing with (an older version of the game) isn't described. The basics of it are: The number of commodities played with is equal to the number of players. The bull and bear cards are included. All but two players receive 8 cards, two receive 9 cards. A player can win the round with 7 + bull, 8, or 8 + bull (receiving double points). The bear is a penalty card. You can trade up to a maximum of 4 cards at a time. They must all be of the same type, but can optionally include the bull or bear (so, you could trade A, A, A, Bull - but not A, B, A, Bull). For those who have played the card game, it will probably have been as obvious to you as it was to me that given the nature of the game, gameplay would seem to resemble a greedy algorithm. With this in mind, I thought it might simplify my AI experience somewhat. So, here's what I've come up with for a basic AI player to play Pit... and I'd really just like any form of suggestion (from improvements to reading materials) relating to it. Here it is in something vaguely pseudo-code-ish ;) While AI does not hold 7 similar + bull, 8 similar, or 8 similar + bull, do: 1. Establish 'target' hand, by seeing which card AI holds the most of. 2. Prepare to trade next-most-numerous card type in a trade (max. held, or 4, whichever is fewer) 3. If holding the bear, add to (if trading <=3 cards) or replace in (if trading 4 cards) hand. 4. Offer cards for trade. 5. If cards are accepted for trade within X turns, continue (clearing 'failed card types'). Otherwise: a. If only one card remains in the trade, go to #6. Otherwise: i. Remove one non-penalty card from the trade. ii. Return to #5. 6. Add card type to temporary list of failed card types. 7. Repeat from #2 (excluding 'failed card types'). I'm aware this is likely to be a sub-optimal way of solving the problem, but that's why I'm posting this question. Are there any AI- or algorithm-related concepts that I've missed and should be incorporating to make a better AI? Additionally, what are the flaws with my AI at present (I'm well aware it's probably far from complete)? Thanks in advance!

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• Accessing HTTP status code while using WCF client for accessing RESTful services

  - by Hemant

  Thanks to this answer, I am now able to successfully call a JSON RESTful service using a WCF client. But that service uses HTTP status codes to notify the result. I am not sure how I can access those status codes since I just receive an exception on client side while calling the service. Even the exception doesn't have HTTP status code property. It is just buried in the exception message itself. So the question is, how to check/access the HTTP status code of response when the service is called.

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• ASP.NET MVC Colon in URL

  - by Joe Morgan

  I've seen that IIS has a problem with letting colons into URLs. I also saw the suggestions others offered here. With the site I'm working on, I want to be able to pass titles of movies, books, etc., into my URL, colon included, like this: mysite.com/Movie/Bob:The Return This would be consumed by my MovieController, for example, as a string and used further down the line. I realize that a colon is not ideal. Does anyone have any other suggestions? As poor as it currently is, I'm doing a find-and-replace from all colons (:) to another character, then a backwards replace when I want to consume it on the Controller end.

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• Subsetting a data frame in a function using another data frame as parameter

  - by lecodesportif

  I would like to submit a data frame to a function and use it to subset another data frame. This is the basic data frame: foo <- data.frame(var1= c('1', '1', '1', '2', '2', '3'), var2=c('A', 'A', 'B', 'B', 'C', 'C')) I use the following function to find out the frequencies of var2 for specified values of var1. foobar <- function(x, y, z){ a <- subset(x, (x$var1 == y)) b <- subset(a, (a$var2 == z)) n=nrow(b) return(n) } Examples: foobar(foo, 1, "A") # returns 2 foobar(foo, 1, "B") # returns 1 foobar(foo, 3, "C") # returns 1 This works. But now I want to submit a data frame of values to foobar. Instead of the above examples, I would like to submit df to foobar and get the same results as above (2, 1, 1) df <- data.frame(var1=c('1','1','3'), var2=c("A", "B", "C")) When I change foobar to accept two arguments like foobar(foo, df) and use y[, c(var1)] and y[, c(var2)] instead of the two parameters x and y it still doesn't work. Which way is there to do this?

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• Collision detection by sliding against a plane in XNA

  - by Bevin

  Hello, I am attempting to engineer a collision detection algorithm for a custom Minecraft client I'm making. Basically, the entire world is made up of cubes, and the player (or camera) needs to be able to stand on and move against these cubes. The result I want is illustrated in this image: The green line is the player's movement vector. When the player is brushing up against a plane of one of the cubes, I want the vector to change to one that is perpendicular with the plane. The vector should, however, keep all of it's velocity in the plane's direction, yet lose all velocity towards the plane. I hope I've made my question clear. What is the best and most efficient way to implement a collision detection system like this? Also, will a system like this allow for a simple gravity component?

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• Draw a Image on FullScreen mode Android

  - by Marcos Vasconcelos

  Hi, I already know how to get my Activity as fullscreen on Android, now I need to draw a Image in this screen. This is my XML layout. <?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent"> <ImageView android:id="@+id/image01" android:layout_width="fill_parent" android:layout_height="fill_parent" /> </LinearLayout> This image is dynamic generated and drawed in the ImageView. This is my code on my Activity. public void onCreate(Bundle savedInstance) { super.onCreate(savedInstance); requestWindowFeature(Window.FEATURE_NO_TITLE); getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN); setContentView(R.layout.main); } But when running, the Activity is FullScreen, but the ImageView is adjusted in the center. What's wrong?

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• How to use Regular Expression to extract information from a HTML webpage?

  - by user569248

  How to use Regular Expression to extract the answer "Here is the answer" from a HTML webpage like this? <b>Last Question:</b> <b>Here is the answer</b> ..:: Update ::.. Thanks everybody! Here is my solution by using BeautifulSoup since I'm using Python framework: response = opener.open(url) the_page = response.read() soup = BeautifulSoup(''.join(the_page)) paraText1 = soup.body.find('div', 'div_id', text = u'Last Question:') if paraText1: answer = paraText1.next

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• Node.js, Cygwin and Socket.io walk into a bar... Node.js throws ENOBUFS and everyone dies...

  - by A Wizard Did It

  I'm hoping someone here can help me out, I'm not having much luck figuring this out myself. I'm running node.js version 0.3.1 on Cygwin. I'm using Connect and Socket.io. I seem to be having some random problems with DNS or something, I haven't quite figured it out. The end result is that I the server is running fine, but when a browser attempts to connect to it the initial HTTP Request works, Socket.io connects, and then the server dies (output below). I don't think it has anything to do with the HTTP request because the server gets a lot data posted to it, and it was receiving requests and responding up until my connection that killed it. I've googled around and the closest thing I've found is DNS being set improperly. It's a network program meant to run only on an internal network, so I've set the nameserver x.x.x.x in my /etc/resolv.conf to the internal DNS. I've also added nameserver 8.8.8.8 in addition. I'm not sure what else to check, but would be grateful of any help. In node.exe.stackdump Exception: STATUS_ACCESS_VIOLATION at eip=610C51B9 eax=00000000 ebx=00000001 ecx=00000000 edx=00000308 esi=00000000 edi=010FCCB0 ebp=010FCAEC esp=010FCAC4 program=\\?\E:\cygwin\usr\local\bin\node.exe, pid 3296, thread unknown (0xBEC) cs=0023 ds=002B es=002B fs=0053 gs=002B ss=002B Stack trace: Frame Function Args 010FCAEC 610C51B9 (00000000, 00000000, 00000000, 00000000) 010FCBFC 610C5B55 (00000000, 00000000, 00000000, 00000000) 010FCCBC 610C693A (FFFFFFFF, FFFFFFFF, 750334F3, FFFFFFFE) 010FCD0C 61027CB2 (00000002, F4B994D5, 010FCE64, 00000002) 010FCD98 76306B59 (00000002, 010FCDD4, 763069A4, 00000002) End of stack trace Node Output: node.js:50 throw e; // process.nextTick error, or 'error' event on first tick ^ Error: ENOBUFS, No buffer space available at doConnect (net.js:642:19) at net.js:803:9 at dns.js:166:30 at IOWatcher.callback (dns.js:48:15) EDIT I'm hitting an LDAP server using http.createClient immediately after a client connects to get information, and that seems to be where the problem is that is causing ENOBUFS. I've edited the source to include && errno != ENOBUFS which now prevents the server from dying, however now the LDAP request isn't working. I'm not sure what the problem is that would cause that though. As I mentioned this is an internal only application, so I set the DNS servers in /etc/resolv.conf to the DNS servers that are being applied to the host machine. Not sure if this is part of the issue? EDIT 2 Here's some output from gdb --args ./node_g --debug ../myscript.js. I'm not sure if this is related to ENOBUFS, however, as it seems to be disconnecting immediately after connection with Socket.io [New thread 672.0x100] Error: dll starting at 0x76e30000 not found. Error: dll starting at 0x76250000 not found. Error: dll starting at 0x76e30000 not found. Error: dll starting at 0x76f50000 not found. [New thread 672.0xc90] [New thread 672.0x448] debugger listening on port 5858 [New thread 672.0xbf4] 14 Jan 18:48:57 - socket.io ready - accepting connections [New thread 672.0xed4] [New thread 672.0xd68] [New thread 672.0x1244] [New thread 672.0xf14] 14 Jan 18:49:02 - Initializing client with transport "websocket" assertion "b[1] == 0" failed: file "../src/node.cc", line 933, function: ssize_t node::DecodeWrite(char*, size_t, v8::Handle<v8::Value>, node::encoding) Program received signal SIGABRT, Aborted. 0x7724f861 in ntdll!RtlUpdateClonedSRWLock () from /cygdrive/c/Windows/system32/ntdll.dll (gdb) backtrace #0 0x7724f861 in ntdll!RtlUpdateClonedSRWLock () from /cygdrive/c/Windows/system32/ntdll.dll #1 0x7724f861 in ntdll!RtlUpdateClonedSRWLock () from /cygdrive/c/Windows/system32/ntdll.dll #2 0x75030816 in WaitForSingleObjectEx () from /cygdrive/c/Windows/syswow64/KernelBase.dll #3 0x0000035c in ?? () #4 0x00000000 in ?? () (gdb)

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• Database indexes and their Big-O notation

  - by miket2e

  I'm trying to understand the performance of database indexes in terms of Big-O notation. Without knowing much about it, I would guess that: Querying on a primary key or unique index will give you a O(1) lookup time. Querying on a non-unique index will also give a O(1) time, albeit maybe the '1' is slower than for the unique index (?) Querying on a column without an index will give a O(N) lookup time (full table scan). Is this generally correct ? Will querying on a primary key ever give worse performance than O(1) ? My specific concern is for SQLite, but I'd be interested in knowing to what extent this varies between different databases too.

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