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• Installer un forum PHPBB sur IIS 7, par Florian Casabianca

  Citation: Cet article illustre l'installation d'un forum PHPBB sur la dernière plateforme Web de Microsoft: Windows Server 2008 R2 et IIS 7. Ce scénario est facilement réalisable grâce à l'initiative « Ma Plateforme Web » lancée par Microsoft entre Mars et Juin 2010. c'est par ici n'hésitez pas à utiliser ce thread pour poster vos remarques...

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• Compiling OpenCV in Android NDK

  - by evident

  PLEASE SEE THE ADDITIONS AT THE BOTTOM! The first problem is solved in Linux, not under Windows and Cygwin yet, but there is a new problem. Please see below! I am currently trying to compile OpenCV for Android NDK so that I can use it in my apps. For this I tried to follow this guide: http://www.stanford.edu/~zxwang/android_opencv.html But when compiling the downloaded stuff with ndk-build I get this error: $ /cygdrive/u/flori/workspace/android-ndk-r5b/ndk-build Compile++ thumb : opencv <= cvjni.cpp Compile++ thumb : cxcore <= cxalloc.cpp Compile++ thumb : cxcore <= cxarithm.cpp Compile++ thumb : cxcore <= cxarray.cpp Compile++ thumb : cxcore <= cxcmp.cpp Compile++ thumb : cxcore <= cxconvert.cpp Compile++ thumb : cxcore <= cxcopy.cpp Compile++ thumb : cxcore <= cxdatastructs.cpp Compile++ thumb : cxcore <= cxdrawing.cpp Compile++ thumb : cxcore <= cxdxt.cpp Compile++ thumb : cxcore <= cxerror.cpp Compile++ thumb : cxcore <= cximage.cpp Compile++ thumb : cxcore <= cxjacobieigens.cpp Compile++ thumb : cxcore <= cxlogic.cpp Compile++ thumb : cxcore <= cxlut.cpp Compile++ thumb : cxcore <= cxmathfuncs.cpp Compile++ thumb : cxcore <= cxmatmul.cpp Compile++ thumb : cxcore <= cxmatrix.cpp Compile++ thumb : cxcore <= cxmean.cpp Compile++ thumb : cxcore <= cxmeansdv.cpp Compile++ thumb : cxcore <= cxminmaxloc.cpp Compile++ thumb : cxcore <= cxnorm.cpp Compile++ thumb : cxcore <= cxouttext.cpp Compile++ thumb : cxcore <= cxpersistence.cpp Compile++ thumb : cxcore <= cxprecomp.cpp Compile++ thumb : cxcore <= cxrand.cpp Compile++ thumb : cxcore <= cxsumpixels.cpp Compile++ thumb : cxcore <= cxsvd.cpp Compile++ thumb : cxcore <= cxswitcher.cpp Compile++ thumb : cxcore <= cxtables.cpp Compile++ thumb : cxcore <= cxutils.cpp StaticLibrary : libstdc++.a StaticLibrary : libcxcore.a Compile++ thumb : cv <= cvaccum.cpp Compile++ thumb : cv <= cvadapthresh.cpp Compile++ thumb : cv <= cvapprox.cpp Compile++ thumb : cv <= cvcalccontrasthistogram.cpp Compile++ thumb : cv <= cvcalcimagehomography.cpp Compile++ thumb : cv <= cvcalibinit.cpp Compile++ thumb : cv <= cvcalibration.cpp Compile++ thumb : cv <= cvcamshift.cpp Compile++ thumb : cv <= cvcanny.cpp Compile++ thumb : cv <= cvcolor.cpp Compile++ thumb : cv <= cvcondens.cpp Compile++ thumb : cv <= cvcontours.cpp Compile++ thumb : cv <= cvcontourtree.cpp Compile++ thumb : cv <= cvconvhull.cpp Compile++ thumb : cv <= cvcorner.cpp Compile++ thumb : cv <= cvcornersubpix.cpp Compile++ thumb : cv <= cvderiv.cpp Compile++ thumb : cv <= cvdistransform.cpp Compile++ thumb : cv <= cvdominants.cpp Compile++ thumb : cv <= cvemd.cpp Compile++ thumb : cv <= cvfeatureselect.cpp Compile++ thumb : cv <= cvfilter.cpp Compile++ thumb : cv <= cvfloodfill.cpp Compile++ thumb : cv <= cvfundam.cpp Compile++ thumb : cv <= cvgeometry.cpp Compile++ thumb : cv <= cvhaar.cpp Compile++ thumb : cv <= cvhistogram.cpp Compile++ thumb : cv <= cvhough.cpp Compile++ thumb : cv <= cvimgwarp.cpp Compile++ thumb : cv <= cvinpaint.cpp Compile++ thumb : cv <= cvkalman.cpp Compile++ thumb : cv <= cvlinefit.cpp Compile++ thumb : cv <= cvlkpyramid.cpp Compile++ thumb : cv <= cvmatchcontours.cpp Compile++ thumb : cv <= cvmoments.cpp Compile++ thumb : cv <= cvmorph.cpp Compile++ thumb : cv <= cvmotempl.cpp Compile++ thumb : cv <= cvoptflowbm.cpp Compile++ thumb : cv <= cvoptflowhs.cpp Compile++ thumb : cv <= cvoptflowlk.cpp Compile++ thumb : cv <= cvpgh.cpp Compile++ thumb : cv <= cvposit.cpp Compile++ thumb : cv <= cvprecomp.cpp Compile++ thumb : cv <= cvpyramids.cpp Compile++ thumb : cv <= cvpyrsegmentation.cpp Compile++ thumb : cv <= cvrotcalipers.cpp Compile++ thumb : cv <= cvsamplers.cpp Compile++ thumb : cv <= cvsegmentation.cpp Compile++ thumb : cv <= cvshapedescr.cpp Compile++ thumb : cv <= cvsmooth.cpp Compile++ thumb : cv <= cvsnakes.cpp Compile++ thumb : cv <= cvstereobm.cpp Compile++ thumb : cv <= cvstereogc.cpp Compile++ thumb : cv <= cvsubdivision2d.cpp Compile++ thumb : cv <= cvsumpixels.cpp Compile++ thumb : cv <= cvsurf.cpp Compile++ thumb : cv <= cvswitcher.cpp Compile++ thumb : cv <= cvtables.cpp Compile++ thumb : cv <= cvtemplmatch.cpp Compile++ thumb : cv <= cvthresh.cpp Compile++ thumb : cv <= cvundistort.cpp Compile++ thumb : cv <= cvutils.cpp StaticLibrary : libcv.a SharedLibrary : libopencv.so U:/flori/workspace/android-ndk-r5b/toolchains/arm-linux-androideabi-4.4.3/prebui lt/windows/bin/../lib/gcc/arm-linux-androideabi/4.4.3/../../../../arm-linux-andr oideabi/bin/ld.exe: cannot find -lcxcore collect2: ld returned 1 exit status make: *** [/cygdrive/u/flori/workspace/android/testOpenCV/obj/local/armeabi/libo pencv.so] Error 1 I am trying to compile it on a Windows system and with the newest NDK version... Does anybody have an idea what this linking error means and what I can to to have it work again? Would be great if anybody could help After getting the problem to work I found that there is another way of compiling OpenCV for Android, using the current version of OpenCV (instead of the 1.1 one from above) and the modified Android NDK from crystax, which supports STL and exceptions and therefore supports the newest OpenCV Version. All information on that can be found here: http://opencv.willowgarage.com/wiki/Android There it says to download the current svn trunk and the crystax-r4 android-ndk, as well as swig, which I did. I entered the folder, created the build directory, ran cmake and then built the static libs, which seemed to work. At least it successfully ran the make-command without errors. I now wanted to build the shared libraries so I entered the android-jni folder and ran 'make' again, but got this error: % make -j4 OPENCV_CONFIG = ../build/android-opencv.mk make clean-swig &&\ mkdir -p jni/gen &&\ mkdir -p src/com/opencv/jni &&\ swig -java -c++ -package "com.opencv.jni" \ -outdir src/com/opencv/jni \ -o jni/gen/android_cv_wrap.cpp jni/android-cv.i OPENCV_CONFIG = ../build/android-opencv.mk make[1]: Entering directory `/home/florian/android-opencv-willowgarage/android/android-jni' make[1]: warning: jobserver unavailable: using -j1. Add `+' to parent make rule. rm -f jni/gen/android_cv_wrap.cpp make[1]: Leaving directory `/home/florian/android-opencv-willowgarage/android/android-jni' /home/florian/android-ndk-r4-crystax/ndk-build OPENCV_CONFIG=../build/android-opencv.mk \ PROJECT_PATH= ARM_TARGETS="armeabi armeabi-v7a" V= /home/florian/android-ndk-r4-crystax/ndk-build OPENCV_CONFIG=../build/android-opencv.mk \ PROJECT_PATH= ARM_TARGETS="armeabi armeabi-v7a" V= make[1]: Entering directory `/home/florian/android-opencv-willowgarage/android/android-jni' /home/florian/android-opencv-willowgarage/android/android-jni/jni/Android.mk:10: ../build/android-opencv.mk: No such file or directory make[1]: Entering directory `/home/florian/android-opencv-willowgarage/android/android-jni' /home/florian/android-opencv-willowgarage/android/android-jni/jni/Android.mk:10: ../build/android-opencv.mk: No such file or directory /home/florian/android-opencv-willowgarage/android/android-jni/jni/Android.mk:10: ../build/android-opencv.mk: No such file or directory make[1]: warning: jobserver unavailable: using -j1. Add `+' to parent make rule. /home/florian/android-opencv-willowgarage/android/android-jni/jni/Android.mk:10: ../build/android-opencv.mk: No such file or directory make[1]: *** No rule to make target `../build/android-opencv.mk'. Stop. make[1]: Leaving directory `/home/florian/android-opencv-willowgarage/android/android-jni' make: *** [libs/armeabi/libandroid-opencv.so] Error 2 make: *** Waiting for unfinished jobs.... make[1]: warning: jobserver unavailable: using -j1. Add `+' to parent make rule. make[1]: *** No rule to make target `../build/android-opencv.mk'. Stop. make[1]: Leaving directory `/home/florian/android-opencv-willowgarage/android/android-jni' make: *** [libs/armeabi-v7a/libandroid-opencv.so] Error 2 Does anybody have an idea what this means and what I can do to build the shared libraries? ... Ok after having a look at the error message it came to me that it seems to have something missing in the build directory... but there wasn't even a build directory in the android folder so I created one, ran 'cmake' in there and 'make' again but get this error: Compile thumb : opencv_lapack <= /home/florian/android-opencv-willowgarage/3rdparty/lapack/sgetrf.c Compile thumb : opencv_lapack <= /home/florian/android-opencv-willowgarage/3rdparty/lapack/scopy.c Compile++ thumb: opencv_core <= /home/florian/android-opencv-willowgarage/modules/core/src/matrix.cpp cc1plus: error: /home/florian/android-opencv-willowgarage/android/../modules/index.rst/include: Not a directory make[3]: *** [/home/florian/android-opencv-willowgarage/android/build/obj/local/armeabi/objs/opencv_core/src/matrix.o] Error 1 make[3]: *** Waiting for unfinished jobs.... make[2]: *** [android-opencv] Error 2 make[1]: *** [CMakeFiles/ndk.dir/all] Error 2 make: *** [all] Error 2 Anybody know what this means?

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• App.Config or XAML

  - by Florian Doyon

  Hi ladies(?) and gents, I am currently evaluating my options for a rewrite of the projects I'm working on and I am a bit miffed by the stringly-typed nature of our app.config files. I'd like to move to a more structured approach, so I have two options: Use custom SectionHandlers in the app.config Scrap app.config and use XAML instead. I'd like to get your opinions and horror stories on this, what are the pros and cons of using XAML for this? Cheers, Florian

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• Eclipse uses 100 % CPU randomly

  - by Florian Gutmann

  Hi everyone! My eclipse sometimes starts using 100 % of my CPU very spontaneously. I can't figure out why it needs that much CPU usage. There is no background task like "building workspace" running. After some time the CPU load drops to 0 and everything is normal. I can't find any information related to the problem in workspace/.metadata/.log file. Has anybody some tip how i can figure out which part of eclipse is using the CPU so heavily? Is there a way to get a thread dump of eclipse? The kill -3 on the eclipse process doesn't do anything. Eclipse Version: Galileo JavaEE Operating System: Linux 2.6.31 Thanks in advance! Florian

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• Changing a Container while using Visitor

  - by Florian

  Hi everyone, I implemented the Visitor pattern in C++ using a STL-like iterator for storing the Visitor's current position in the container. Now I would like to change the container while I iterate over it, and I'm especially interested in deleting items from the container, even the one I'm currently visiting. Now obviously this will invalidate the Visitors internal iterator, because it was pointing to exactly this item. Currently, I store a list of all iterators in the container and update them, as soon as anything is added to or removed from the list. So in a way this is similar to the Observer pattern applied to the iterator (as Observer) and the list (as Observable). Alternatively I considered having the visitor() methods return some hint to the Visitor about what happend to the current item and how to proceed iterating, but that doesn't sound like such a good idea either, because the visit() implementation shouldn't really care about finding the next item. So, my question is: What's the best way to keep a visitor working, even when items are added to the container or removed from it. Regards, Florian

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• How can I limit ModelAdmin queryset to user-editable items when using object permissions?

  - by brookstravis

  I'm trying to implement Florian's object permissions system from his article on Django Advent, but I'm running into an issue trying to limit the queryset returned to only items the user has permission to edit/view. Florian mentions it in his section on wrapping the admin, but skips over it. I can't see a good way to filter the queryset. Am I missing something?

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• How to import UTM coordinates into Google Earth?

  - by Florian Jenn

  I have some points in UTM coordinates that I'd like to import into Google Earth. Google Earth is able to show UTM coordinates, but I have not found a way to import points or enter coordinates in a placemark's properties with UTM coordinates. Is there any possibility to do this with just Google Earth or do I need to convert my data set externally? I do have separate tools for coordinate conversion, but I'd like to spare the extra step.

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• How to generate an ASCII representation of a Unix file hierarchy?

  - by Jenn D.

  Hi, all. I'm looking for a quick and dirty way to generate some diagrams of some directories that have almost, but not exactly, the same hierarchy, so I can show them around at a meeting and we can decide which flavor we like best. I'm not interested in the "leaf" nodes, just the directories. The catch: I don't want to mess with X. This is a server system I deal with entirely through SSH. So I'm looking for something that will do ASCII layout, maybe with simple pipes-and-hyphens for lines or something. Does anyone know of such a utility? I'm sure I could write something myself, but it's such a fiddly little sort of project, with handling spacing and layout and such; I'd really like to discover that someone's done it for me. Alas, Google doesn't seem to know of such a thing...or if it does, it's hidden beneath heaps of excellent visual explications of the standard general Unix file hierarchy. Thanks!

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• Fill down in Excel, but based on multiple values

  - by Jenn D.

  I have spreadsheets (not created by me) that have blank entries in one column where they should really have data. I want to take every empty cell and fill it with the nearest value above it. I'm looking for as little manual intervention as possible, because I'll have to do it repeatedly. I thought some previous version of Excel, or maybe another spreadsheet from the distant past, would do this by default -- that is, if you selected the column with foo and bar, and chose the equivalent of "fill down", you would get what's in the WANT column. What I actually get in Excel is the GET column. HAVE: WANT: GET: foo 1 foo 1 foo 1 2 foo 2 foo 2 bar 1 bar 1 foo 1 2 bar 2 foo 2 3 bar 3 foo 3 I'm worried that this might need a macro to be done properly. I used to be a whiz with Excel macros, and then suddenly they were all in VB. My fallback position will be to dump the whole thing to CSV and write a Python script, but if there's any way to do it in Excel that would be much preferable. Even if it involves a couple of different manual steps, that's fine; just not one step per group of lines. That is, a process of "copy the column, do X to it, cut and paste it back" would work, but "do X for each occurrence of foo or bar" won't. The files are too big for that. Any thoughts are appreciated!

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• Simple Java networking game engine [on hold]

  - by Florian Peschka

  I want to create a simple java networking game and search a networking engine that eases use of sockets etc. I have already read some questions on here and the internet about java networking for games, but many of them were over 10 years old or not really answered. I have no idea whatsoever about what exactly I need to send in terms of messages, but I figured simple strings or integers will be enough for my purposes. It's basically a peer to peer game, so I don't need a centralized server structure. Messaging doesn't have to have an extremely low ping, yet of course all players need to have a synchronized view. What are the possibilities I have here?

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• If my team has low skill, should I lower the skill of my code?

  - by Florian Margaine

  For example, there is a common snippet in JS to get a default value: function f(x) { x = x || 10; } This kind of snippet is not easily understood by all the members of my team, their JS level being low. Should I not use this trick then? It makes the code less readable by peers, but more readable than the following according to any JS dev: function f(x) { if (!x) { x = 10; } } Sure, if I use this trick and a colleague sees it, then they can learn something. But the case is often that they see this as "trying to be clever". So, should I lower the level of my code if my teammates have a lower level than me?

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• How do I re-install Unity after uninstalling gnome-shell?

  - by Florian

  I am using Ubuntu 14.04. I have big issues with the Unity desktop. I installed then uninstalled gnome-shell (using "apt-get autoremove --purge gnome-shell"). Since then, my desktop has no background and no icons. Plus, and this is the bothering part, unity is very unstable. On startup, there is a huge use of memory, much more than before. Sometimes, I also cannot minimize a window without having the desktop freezing and having to kill the process in question with tty1. I have tried to use : apt-get autoremove --purge ubuntu-desktop apt-get install ubuntu-desktop But it does not change a thing. I tried to update my video drivers but it is still the same. How can I reinstall the unity desktop thoroughly (obviously, something in its install is broken) ? If it is not possible, is it safe that I create a new partition on my disk where I will put my files and reinstall Ubuntu on the old partition (I do have a USB install of Ubuntu 14.04 but not enough space to save my files on it) ?

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• Micro QR Code Generator with minimal error correction

  - by Florian Peschka

  I am searching a Micro QR Code Generator that fulfills the following requirements: At least 20 characters encoded Minimal error correction (required to get the 20 characters stuffed in) I already searched google, but it seems all micro qr generators automatically use maximum error correction, which is very unhandy for my task, as we need the 20 characters completety. I can't use standard QR because there are certain requirements that need the code to be smaller than a certain dimension when printed... I hope someone can help me. PS: I'm not sure that this is the right board to post this question on, so feel free to redirect me to a better board if you have an idea. PPS: If nothing can be found and I'm forced to write one on my own: Where can I find detailed information on how to write a QR code generator?

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• Is eval the defmacro of javascript?

  - by Florian Margaine

  In Common Lisp, defmacro basically allows us to build our own DSL. I read this page today and it explains something cleverly done: But I wasn't about to write out all these boring predicates myself, so I defined a function that, given a list of words, builds up the text for such a predicate automatically, and then evals it to produce a function. Which just looks like defmacro to me. Is eval the defmacro of javascript? Could it be used as such?

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• Question about casting a class in Java with generics

  - by Florian F

  In Java 6 Class<? extends ArrayList<?>> a = ArrayList.class; gives and error, but Class<? extends ArrayList<?>> b = (Class<? extends ArrayList<?>>)ArrayList.class; gives a warning. Why is (a) an error? What is it, that Java needs to do in the assignment, if not the cast shown in (b)? And why isn't ArrayList compatible with ArrayList? I know one is "raw" and the other is "generic", but what is it you can do with an ArrayList and not with an ArrayList, or the other way around?

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• Different callbacks for error or error as first argument?

  - by Florian Margaine

  We (and the JS SO chat room) had a talk with @rlemon some days ago about his Little-XHR library about error handling. Basically, we wanted to decide which error handling pattern should be used: xhr.get({ // Some parameters, and then success: function(data) {}, failure: function(data) {} }) Or: xhr.get({ // Some parameters, and then callback: function(err, data) {} }) One is more jQuery-like, while the other is more Node-like. Some say that the first pattern makes you think more about handling error. I think the opposite, since you may forget the other callback function, while the argument is always there on the second pattern. Any opinion/advantage/drawback about both these patterns?

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• Macbook Pro 8,1 - wireless interface not showing up

  - by Florian Margaine

  I've installed Ubuntu 11.10 on my Macbook Pro 8,1. Everything went fine and everything installs fine except for the wireless interface. I've installed the b43 module according to these instructions: https://help.ubuntu.com/community/MacBookPro8-1/Natty#Wireless I've tried compiling the module, ndiswrapper and also the last solution mentioned using this PPA: ppa:zwaldowski/ppa. With the three solutions, the module loads finely. It works smoothly. lspci shows the wireless card without problem. But there is no wireless interface. iwconfig or ifconfig both show eth0 and lo as interfaces, but no eth1 or wlan0 interface is showing up. I have no idea why, and I'm completely stuck there.

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• libssh2 and simultaneous connections

  - by Florian Margaine

  I'm writing a node.js C++ module using the C library libssh2. The module is supposed to be a bridge to connect to SSH over HTTPS. Right now, I'm still in the design/learning phase of v8 API and C++, and I have a design question: libssh2 is a C library, all its methods are global. From what I see in the examples, libssh2 can only handle one connection at a time. If I want to allow simultaneous connections to different SSH servers, do I have to fork a process to completely separate the libssh2 "instances", or is forking a thread enough? I don't know enough of the separation limit used there. Any idea on how to handle this is appreciated.

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• Ubuntu 12.04 NVIDIA GeForce Go 7600 black screen during boot

  - by Florian Schmidt

  I'm using Ubuntu as the only operating system since two years. In the first Ubuntu versions I had seen my BIOS screen and the boot screens. Actually im using Ubuntu 12.04 and my screen stays black until Ubuntu is started (both screens are missing). I guess this situation appeared the first time in Ubuntu 11 (not sure). I searched via google and tried the popular activities but was not able to fix my issue. I opened the laptop and checked all connections. I'm using boot option nomodeset. I had a look through many many web pages. I don't know how to continue and hope somebody could be helpful. My hardware: Acer Aspire 9300 AMD Turion 64 x2 NVIDIA GeForce Go 7600 (using proposed driver) lspci | grep NVIDIA 00:00.0 RAM memory: NVIDIA Corporation C51 Host Bridge (rev a2) 00:00.1 RAM memory: NVIDIA Corporation C51 Memory Controller 0 (rev a2) 00:00.2 RAM memory: NVIDIA Corporation C51 Memory Controller 1 (rev a2) 00:00.3 RAM memory: NVIDIA Corporation C51 Memory Controller 5 (rev a2) 00:00.4 RAM memory: NVIDIA Corporation C51 Memory Controller 4 (rev a2) 00:00.5 RAM memory: NVIDIA Corporation C51 Host Bridge (rev a2) 00:00.6 RAM memory: NVIDIA Corporation C51 Memory Controller 3 (rev a2) 00:00.7 RAM memory: NVIDIA Corporation C51 Memory Controller 2 (rev a2) 00:02.0 PCI bridge: NVIDIA Corporation C51 PCI Express Bridge (rev a1) 00:03.0 PCI bridge: NVIDIA Corporation C51 PCI Express Bridge (rev a1) 00:04.0 PCI bridge: NVIDIA Corporation C51 PCI Express Bridge (rev a1) 00:09.0 RAM memory: NVIDIA Corporation MCP51 Host Bridge (rev a2) 00:0a.0 ISA bridge: NVIDIA Corporation MCP51 LPC Bridge (rev a3) 00:0a.1 SMBus: NVIDIA Corporation MCP51 SMBus (rev a3) 00:0a.3 Co-processor: NVIDIA Corporation MCP51 PMU (rev a3) 00:0b.0 USB controller: NVIDIA Corporation MCP51 USB Controller (rev a3) 00:0b.1 USB controller: NVIDIA Corporation MCP51 USB Controller (rev a3) 00:0d.0 IDE interface: NVIDIA Corporation MCP51 IDE (rev f1) 00:0e.0 IDE interface: NVIDIA Corporation MCP51 Serial ATA Controller (rev f1) 00:10.0 PCI bridge: NVIDIA Corporation MCP51 PCI Bridge (rev a2) 00:10.1 Audio device: NVIDIA Corporation MCP51 High Definition Audio (rev a2) 00:14.0 Bridge: NVIDIA Corporation MCP51 Ethernet Controller (rev a3) 03:00.0 VGA compatible controller: NVIDIA Corporation G73 [GeForce Go 7600] (rev a1) So my question is what to do to fix the black screen during boot?

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• Direction of the bullet - how to have something else than left, right, top, bottom

  - by Florian Margaine

  I'm making a simple shooter game using canvas and javascript. The current code can be seen here. To know which way I want the bullet to be shot, I simply have a direction property that can have 4 values (left, right, bottom, top), and I can then calculate the next position of the bullet easily. However, I'd like to move the bullet to the mouse position, but I don't really see how to do this. How do I calculate the next position? I'm guessing there is some formula to calculate the line between two positions (the player's and the mouse's), but I don't have much idea yet. So there is no obstacle, but I don't see how to calculate this, and be able have the next position of the bullet at each frame.

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• Should I organize my folders by business domain or by technical domain?

  - by Florian Margaine

  For example, if I'm using some MVC-like architecture, which folder structure should I use: domain1/ controller model view domain2/ controller model view Or: controllers/ domain1 domain2 models/ domain1 domain2 views/ domain1 domain2 I deliberately left out file extensions to keep this question language-agnostic. Personally, I'd prefer to separate by business domain (gut feeling), but I see that most/many frameworks separate by technical domain. Why whould I choose one over the other?

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• In Drools Rules, how to use two different ArrayList objects,obj1 is used in rule 1 and obj2 used in rule2?

  - by Jenn

  I am doing ksession.insert(list) and after that I have to fire rule 1 in the drl file, then ksession.insert(list) and fire rule 2 in the drl. Could someone tell me how to achieve this. I read about agenda filters and facthandles but do not really know how to get this to work Below is some code: ArrayList list = new ArrayList(); list.add(product1); list.add(product2); list.add(product3); ksession.insert(list); ksession.fireAllRules("fire rule 1 in drl"); //remove list? ArrayList list2 = new ArrayList(); list2.add(str1); list2.add(str2); list2.add(str3); ksession.insert(list2); ksession.fireAllRules("fire rule 2 in drl");

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• Finding all domains registered in a nameserver

  - by Florian

  Up until now, I was pretty confident that it was pretty much impossible to list all the domains handled by a nameserver. But apparently, there exists a couple of websites on the Internet that are able to list all the domains registered in a namerserver. For example: http://www.gwebtools.com/ns-spy/udns1.ultradns.net Or all domains pointing to a specific IP : http://www.robtex.com/ip/190.7.200.92.html (These DNS/IP were picked at random) Do you know how it's done ?

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• Second partition with Windows 7 unmountable

  - by Florian Pilz

  I'm using GRUB2 to dualboot Ubuntu and Windows 7. I installed Windows 7 some days ago and rewrote GRUB2 to cope with the dualboot. Everything went fine till yesterday - I could boot into both OS. Since this morning my laptop restarts every time I choose Windows 7 from the menu. Ubuntu is still working. As I tried to mount the partition with Windows 7 on Ubuntu it gave me return code 2, so this isn't working as well. I tried to reinstall GRUB2 to the MBR but it didn't help. I also tried to repair Windows 7 boot with it's install DVD, while trying so it showed me the following error: "Status: 0xc000000f Info: Boot selection failed because a required device is inaccessible." Tanks in advance

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• Django + gunicorn + virtualenv + Supervisord issue

  - by Florian Le Goff

  Dear all, I have a strange issue with my virtualenv + gunicorn setup, only when gunicorn is launched via supervisord. I do realize that it may very well be an issue with my supervisord and I would appreciate any feedback on a better place to ask for help... In a nutshell : when I run gunicorn from my user shell, inside my virtualenv, everything is working flawlessly. I'm able to access all the views of my Django project. When gunicorn is launched by supervisord at the system startup, everything is OK. But, if I have to kill the gunicorn_django processes, or if I perform a supervisord restart, once that gunicorn_django has relaunched, every request is answered with a weird Traceback : (...) File "/home/hc/prod/venv/lib/python2.6/site-packages/Django-1.2.5-py2.6.egg/django/db/__init__.py", line 77, in connection = connections[DEFAULT_DB_ALIAS] File "/home/hc/prod/venv/lib/python2.6/site-packages/Django-1.2.5-py2.6.egg/django/db/utils.py", line 92, in __getitem__ backend = load_backend(db['ENGINE']) File "/home/hc/prod/venv/lib/python2.6/site-packages/Django-1.2.5-py2.6.egg/django/db/utils.py", line 50, in load_backend raise ImproperlyConfigured(error_msg) TemplateSyntaxError: Caught ImproperlyConfigured while rendering: 'django.db.backends.postgresql_psycopg2' isn't an available database backend. Try using django.db.backends.XXX, where XXX is one of: 'dummy', 'mysql', 'oracle', 'postgresql', 'postgresql_psycopg2', 'sqlite3' Error was: cannot import name utils Full stack available here : http://pastebin.com/BJ5tNQ2N I'm running... Ubuntu/maverick (up-to-date) Python = 2.6.6 virtualenv = 1.5.1 gunicorn = 0.12.0 Django = 1.2.5 psycopg2 = '2.4-beta2 (dt dec pq3 ext)' gunicorn configuration : backlog = 2048 bind = "127.0.0.1:8000" pidfile = "/tmp/gunicorn-hc.pid" daemon = True debug = True workers = 3 logfile = "/home/hc/prod/log/gunicorn.log" loglevel = "info" supervisord configuration : [program:gunicorn] directory=/home/hc/prod/hc command=/home/hc/prod/venv/bin/gunicorn_django -c /home/hc/prod/hc/gunicorn.conf.py user=hc umask=022 autostart=True autorestart=True redirect_stderr=True Any advice ? I've been stuck on this one for quite a while. It seems like some weird memory limit, as I'm not enforcing anything special : $ ulimit -a core file size (blocks, -c) 0 data seg size (kbytes, -d) unlimited scheduling priority (-e) 20 file size (blocks, -f) unlimited pending signals (-i) 16382 max locked memory (kbytes, -l) 64 max memory size (kbytes, -m) unlimited open files (-n) 1024 pipe size (512 bytes, -p) 8 POSIX message queues (bytes, -q) 819200 real-time priority (-r) 0 stack size (kbytes, -s) 8192 cpu time (seconds, -t) unlimited max user processes (-u) unlimited virtual memory (kbytes, -v) unlimited file locks (-x) unlimited Thank you.

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