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• Organizing code for iOS app development

  - by KronoS

  I've been developing an app for the iOS platform, and as I've been going along, I've noticed that I've done a terrible job of keeping my files (.h, .m, .mm) organized. Is there any industry standards or best practices when it comes to organizing files for an iOS project? My files include custom classes (beside the view controllers), customized View Controllers, third-party content, code that works only on iOS 5.0+ and code that works on previous versions. What I'm looking for is a solution to keep things organized in a manner that others (or myself in years to come) can look at this and understand the basic structure of the application and not get lost in the multiple files found therein.

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• Mod_rewrite and urls that don't end with .php

  - by Kevin Laity

  I'm trying to use Mod_rewrite to hide the .php extensions of my pages. However, it refuses to do any rewriting unless the input url ends with .php, which makes that impossible. I can confirm that rewriting works fine as long as the url has .php at the end. RewriteRule a\.php b\.php Works, while RewriteRule a\.html b\.html does not. How can I turn off this behavior and allow it to rewrite all urls? I'm on a shared host so whatever I do has to be done from a .htaccess file. Update: There seems to be some confusion about what I'm asking here. The question is not about how to write the rule, the question is about server configuration. The rule I'm using is fine, I can test that locally. But the server I'm working with is somehow configured so that mod_rewrite doesn't attempt to rewrite anything that doesn't end with .php

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• Pointer initialization doubt

  - by Jestin Joy

  We could initialize a character pointer like this in C. char *c="test"; Where c points to the first character(t). But when I gave code like below. It gives segmentation fault. #include<stdio.h> #include<stdlib.h> main() { int *i; *i=0; printf("%d",*i); } But when I give #include<stdio.h> #include<stdlib.h> main() { int *i; i=(int *)malloc(2); *i=0; printf("%d",*i); } It works( gives output 0). Also when I give malloc(0), It also works( gives output 0). Please tell what is happening

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• Maximum file size for iFrame in IE7

  - by Peter Turner

  I've got a "super secure" javascript downloader* that I wrote, and it usually works alright. But I noticed, while trying to download a 90 meg file with it on a client's machine that on IE7, it's getting hung up about 1/3rd of the way through. I've never tried to send a file that large through the iFrame and it works fine in other browsers. Is there a size restriction on files that IE7 can read in an iFrame? * It's really just a PHP line that sets header("location: http://someplace/downloadbigthing.exe"); after it does some logging and verification.

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• Matrix multiplication - Scene Graphs

  - by bgarate

  I wrote a MatrixStack class in C# to use in a SceneGraph. So, to get the world matrix for an object I am suposed to use: WorldMatrix = ParentWorld * LocalTransform But, in fact, it only works as expected when I do the other way: WorldMatrix = LocalTransform * ParentWorld Mi code is: public class MatrixStack { Stack<Matrix> stack = new Stack<Matrix>(); Matrix result = Matrix.Identity; public void PushMatrix(Matrix matrix) { stack.Push(matrix); result = matrix * result; } public Matrix PopMatrix() { result = Matrix.Invert(stack.Peek()) * result; return stack.Pop(); } public Matrix Result { get { return result; } } public void Clear() { stack.Clear(); result = Matrix.Identity; } } Why it works this way and not the other? Thanks!

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• Facebook and Gmail stop working after 10 minutes

  - by Julia

  I have problem with facebook and gmail only: It works fine and lets me log in, view photos and videos, read new messages, etc. But after 5-10 minuets it doesn't load at all This webpage is not available. The webpage at http://www.facebook.com/ might be temporarily down or it may have moved permanently to a new web address. More information on this error Below is the original error message Error 101 (net::ERR_CONNECTION_RESET): Unknown error After deleting cookies this problem disappears for 5-10 minuets, then I get the same error. It happens with Google Chrome and Firefox. Ping works fine. I have checked System-Preferences-Network Proxy it sets on Default - "Direct Internet Connection". Then I have run test (chrome://net-internals/#tests) and got some FAIL results Use system proxy settings Disable IPv6 host resolving Probe for IPv6 host resolving IPv6 is disabled.

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• Radeon HD 2000, 3000, 4000 on 12.10 Quantal: fglrx (legacy) 12.6 unsupported, what to do?

  - by Andrew Mao

  After upgrading to 12.10 quantal, the packaged version of fglrx no longer works. I discovered that this is because there is a separate 'legacy' fglrx driver for the HD 2k-4k series cards, but it is incompatible with the xorg server on 12.10. This is the most current version of the driver for HD 2000 through HD 4000 series cards. You can't use the non-legacy fglrx driver, but you can use the open-source radeon driver if you prefer your WM compositing to be laggy and your YouTube videos to play like they would on a Pentium MMX series: http://support.amd.com/us/kbarticles/Pages/catalyst126legacyproducts.aspx Usually this driver can be installed in the following way, necessary because apt-get install fglrx would pull in the non-legacy driver: wget http://www2.ati.com/drivers/legacy/amd-driver-installer-12.6-legacy-x86.x86_64.zip unzip amd-driver-installer-* sudo sh ./amd-driver-installer-*.run --buildpkg Ubuntu/quantal sudo dpkg -i fglrx*.deb sudo aticonfig --initial -f If you use a different version of fglrx (for example, a newer 12.9 that doesn't support those cards) then the final command will give you an error no supported hardware detected or something similar. However, everything works at this point and you will get a reasonable xorg.conf: ... other stuff Section "Device" Identifier "aticonfig-Device[0]-0" Driver "fglrx" BusID "PCI:1:5:0" EndSection ... other stuff At this point you're supposed to reboot and everything will be working with the fglrx driver. However, upon rebooting, you'll be treated to the following errors in Xorg.0.log when fglrx attempts to load: (EE) Failed to load /usr/lib/xorg/modules/drivers/fglrx_drv.so: /usr/lib/xorg/modules/drivers/fglrx_drv.so: undefined symbol: noXFree86DRIExtension Some searching around will show that this is a problem with the legacy ATI drivers not supporting xserver 1.13 or newer. (Arch Linux thread) ATI has released a fixed driver for its most recent (HD 5000 series or later) cards, but not for the 'legacy' cards yet. The non-legacy ATI drivers can't be used with the old cards. What should an Ubuntu user, using one of these HD 2000-4000 series cards, do? Wait for an updated 'legacy' ATI driver that properly works with xserver 1.13? Downgrade back to 12.04 Precise, which uses xserver 1.11? Try to downgrade xserver on 12.10 Quantal to 1.12, which could possibly break Unity and GNOME? Forced upgrade to HD 5000 series or later card? (Not possible with integrated graphics...) Some other 1337 action that fixes this problem painlessly?

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• Executable execution path. Does it depends of the place the executable is called from?

  - by Valkea

  as I'm still a new Linux user, I still discover some behaviours and I'm unable to tell if they are "normals" or not. I searched the Internet but as I can't really find an answer I guess it's time to ask here. Few weeks ago I installed a small game called "Machinarium" and I played it... but few days later when I wanted to continue my game I was unable to make the game start correctly. And as I didn't had the time to search I given up. But yesterday as I was working on a program of mine, I had the exactly same behaviour. So I searched a bit and I discovered that when using Nautilus with the "List view", I was able to run the program (ie: the program does find the sound, images etc resources) when I was literally "inside" the executable folder, but unable when I was in a parent folder and expanding it to the executable folder to run it. To illustrate the behaviour here are two screen shots. It doesn't works if the executable is double clicked from here It does works if the executable is double clicked from here This is indeed the same "place", but the Nautilus view is slightly different as the current folder is not the same and it seems to make a difference for the program. Furthermore, when I create a menu items via System Settings/Main Menu to the executable, it behaves just like if the executable can't find the resources (that's why I was unable to play Machinarium the second time as I created a menu short-cut after my first game). So I asked my program to generate a text file at it's root when running, and I started to launch it from different "parent" folders to see where is generated the text file. Each time the file was generated on the top folder of the current Nautilus view. I was expected to see it appears in the same folder of the executable (well not as I was guessing what as happening, but before that I would have expected to see it appears in the exe folder). Does anyone can explain me why it does works like this (I guess it's normal) ? How I'm supposed to solve this when creating programs (Should I detect the executable path in my C++ code or should I organize the resources files another way than on windows ?)

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• How do I remap the buttons on an Apple Mighty Mouse?

  - by Jonathan.

  I just started using Ubuntu instead of Windows, my initial reaction was "omg this is awful", but after a while it grew on me, and I don't plan on going back to Windows. However I have an Apple Mighty Mouse which I was given today, and the buttons on it don't quite work. Left and right click work, so does scrolling right and down, also the back button works. However the forward button goes back, and the scroll up button sometimes scrolls down, scrolling left just doesn't work. Is there a way to fix this? Like remap the buttons? I'm not entirely sure how the driver thing works in Ubuntu?

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• Groups page is blank in SharePoint 2010 [migrated]

  - by Murali Ramakrishnan

  Sometimes it's very confusing how Sharepoint 2010 group creation works Here's a scenario we have been facing from a long time wrt groups in SharePoint 2010 We had requirement of creating a two custom groups followed by creating a custom site through programmatically, For the most case the scenario works as how it is excepted to work. but, out of 1/100 site creation process the groups creation fails, which means we were able to access the group and users associated with it through programmatically. but, when it comes to UI stand point if you try to access the specific group page from the site permissions page - SharePoint returns a BLANK WHITE Page... BLANK WHITE Page... nothing else... Ain't is this a Sharepoint 2010 issue. or anybody had this problem and fixed it. Kindly share your thoughts

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• Can't boot without Flash Drive plugged in

  - by vlad

  (Sorry for my bad English) I had Ubuntu 12.04 Beta installed on my computer. When 12.04 was finally released, I made a bootable USB Flash Drive using Startup Disk Creator. Then I decided to check if this drive works properly and to reinstall the system on my desktop. I must add, my desktop behaves a bit strange when it comes to bootable USB's, it recognizes them as HDD. In BIOS I changed priority of boot so USB Flash Drive (recognized as HDD) was first. Successfully booted, I installed Ubuntu. Everything worked fine, but... Now I cannot boot from my real HDD. Every time I want to boot, I put the USB Flash Drive into my computer, boot, safely remove it and everything works. What have I to do, to repair boot? Thank you for your time!

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• Changing email application in Preferred Applications to GMail?

  - by grm

  I'm trying to change the Preferred Application for email. I have installed the package desktop-webmail, but there is no new option under System - Preferences - Preferred Application as you would expect, infact, there is only one option there, only Evolution. According to this post it should be possible to set a custom application, but no option is available. Is it possible to setup GMail as Preferred email app so that File - Send by email works in gnome apps? This seems to be a dup of another post here, Thing is that this works fine in 10.10, but in 11.04 this method no longer work. My post above is meant for 11.04 and the question is still valid.

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• (Xubuntu) no touchpad or mouse on Aspire One D270

  - by Sman789

  I installed Xubuntu 12.10 on an Aspire One D270 using a Live USB. Initially, the live USB wouldn't boot, but by running sudo apt-get dist-upgrade on it (on a different machine), I upgraded the kernel and it now works perfectly. However, after installing Xubuntu from the stick onto the D270, neither the touchpad nor an external mouse works. If I use the keyboard to navigate to the mouse settings, the 'device' setting is greyed out. I don't see why the mouse should work perfectly when running from the live USB but not once installed to the machine...? Thanks for any help.

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• PDF files made using inkscape doesnot show everything when opened in windows

  - by Manu P Nair

  I made a small vector graphic using inkscape, converted it to pdf. Then i opened the pdf in windows for printing purposes. Many of the lines and curves I made in inkscape were missing. Then I tried the same graphics in coreldraw. Converted it to pdf. Then i opened the file in ubuntu. All lines and curves were there. I want to use ubuntu for all my works. But this problem makes it difficult for me as I have to take the pdf to a printer who works only with windows.

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• Firefox, Chrome, and Flash on Ubuntu

  - by Zimmer

  Ok I have recently run into some problems and was hoping you guys could help; 1) On Chrome sometimes when I play a video (even on Youtube) the audio won't work (yet other apps audio will work) but after pressing the play button (pausing and unpausing the video) it finally works but if I pause the video and click play it goes back to not working until I re-do that process. 2) When I go to play videos in firefox or go to grooveshark it says I don't have flash; but I do and when I go to install flash it says I have the LAST version for linux but flash works on Chrome fine (well except the audio problem above which annoys me to no end!)

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• Wine: How to open a whole folder, not a single file?

  - by Boris Karl Schlein

  I am using foobar2000 under my Ubuntu with Wine since… I don't know. Now, with the new Ubuntu 12.10 release foobar2000 was not starting anymore correctly so I reinstalled it (foobar2000 1.1.15, wine 1.4). Naturally I have to set up my foobar2000 configuration from scratch but thats not a problem at all. Everything works fine except adding whole folders to the music library using the Add-button under "File-Preferences-Media Library". Problem is one can only open files with the Add-dialog but not a whole folder. Under Windows everything works fine. Editing the foobar2000 configuration file ([foobar2000-folder]/configuration/Core.cfg) by hand does not work… I also tried it with a hex editor. :( So… what can I do? Thanks. :)

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• How to debug lag using Bluetooth connected mouse and A2DP headset?

  - by gertvdijk

  I own a Logitech M555b mouse (since a week) for use with my HP Elitebook 8570w laptop running Kubuntu 12.04. Works fine right after connecting using the KDE Bluetooth control module. However, after some time (seemingly random), it starts to lag. Movements are being delayed for roughly 500ms for a short period of time. Usually it recovers after some time too, but it can take minutes. All actions are being delayed: movements, click, scrolls. Additionally, the movements can be choppy during these times. A workaround that always works for the same short period of time is to disconnect an re-connect the mouse. This can be done using the same KDE Bluetooth control module. What did I try already? Running this at boot time: echo on > `readlink -f /sys/class/bluetooth/hci0`/../../../power/level To disable any power saving features on the Bluetooth hci0 device. Check the mouse's batteries (it's just a week old, other new batteries: same result) Checking logs and kernel messages about Bluetooth-related entries: none aside the expected messages on connect time. I'm running kernel 3.5.0-13-generic as provided in the xorg-edgers PPA. Booting the regular 3.2 Precise kernel results in the same behaviour. Some other information that may help: It happens when no other Bluetooth connections are active on the machine. Similar symptoms also occur on my Bluetooth stereo (A2DP) headset, but then it's audio lagging and skipping. Swapping Bluetooth profiles as described here then helps. Conclusion: it's not the mouse that's faulty. The headset always worked fine using my now dead Thinkpad T61p with built-in Bluetooth. The bluetooth module in my laptop is connected via USB and shows up as Bus 002 Device 003: ID 0a5c:21e1 Broadcom Corp. I'm mobile and several people around me are using Bluetooth at work (A2DP mostly). It also occurs at home, where my neighbours are probably using Bluetooth as well. It could just be radio interference, but I think Bluetooth connections should just hop to another channel. And, moreover, it just works properly instantly when re-connecting. Therefore I think it's a software driver issue and I'd like to debug it. Is there any way to get more verbose logging on the Bluetooth(-hid) modules?

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• Rotate an image in a scaled context

  - by nathan

  Here is my working piece of code to rotate an image toward a point (in my case, the mouse cursor). float dx = newx - ploc.x; float dy = newy - ploc.y; float angle = (float) Math.toDegrees(Math.atan2(dy, dx)); Where ploc is the location of the image i'm rotating. And here is the rendering code: g.rotate(loc.x + width / 2, loc.y + height / 2, angle); g.drawImage(frame, loc.x, loc.y); Where loc is the location of the image and "width" and "height" are respectively the width and height of the image. What changes are needed to make it works on a scaled context? e.g make it works with something like g.scale(sx, sy).

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• Kindle Paperwhite Jailbroken; Ready for Custom Screensavers

  - by Jason Fitzpatrick

  If you’re already longing for some custom screensavers on your new Kindle Paperwhite, you’re in luck. The new Kindle has been jailbroken, opening it up to all sorts of custom hacks and modifications. For extra guidance on what to do once you’ve jailbroken, check out our guide to adding the screensaver hack and creating/adding screensaver images–make sure to grab the updated screensaver hack while you’re at it. Kindle 5.1.x Jailbreak [via Hack A Day] 7 Ways To Free Up Hard Disk Space On Windows HTG Explains: How System Restore Works in Windows HTG Explains: How Antivirus Software Works

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• HTG Explains: Photography with Film-Based Cameras

  - by Eric Z Goodnight

  We’ve become reliant on digital cameras since they are so easy to use. But have you ever wondered how film-based photography works? Read on to increase your photographic knowledge—or to develop an new appreciation for your point and click camera. Film-based cameras, to some, are a relic of the past. Simply an old technology made obsolete by the new and improved. But to many, film is an artisan’s material, and a photographic experience no digital system could hope to ever recreate. While many photographers, professional and amateur will swear by the quality of both film-based or digital cameras—the fact remains that film is still a valid way to take great photographs, and a fascinating way to learn more about how photography works.  HTG Explains: Photography with Film-Based CamerasHow to Clean Your Dirty Smartphone (Without Breaking Something)What is a Histogram, and How Can I Use it to Improve My Photos?

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• Getting Wacom Bamboo Pen + Touch pressure sensitivy in GIMP

  - by Bart van Heukelom

  I've installed my Wacom Bamboo Pen + Touch (CTH-460) in Ubuntu (at least on one system, not another) and the pen works well for controlling the mouse cursor. However, I can't get pressure sensitivity to work in GIMP. I have 4 extra devices in the input devices settings screen now, two of which are the pen and eraser. I've set them both from Disabled to Screen, and left the default settings intact. However, after saving I still don't see any pressure options in the brush tool's options. I've also tried setting the mode to Window instead, but it makes no difference regarding pressure sensitivity. There are no other modes. The pressure works out-of-the-box in Blender (grease pen) so it must be something in GIMP. What can be wrong? Why don't the options appear? How can I debug this?

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• Syncing my iPod Touch (And Others)

  - by Benjamin Hannah

  libimobiledevice doesn't work for me. I've got Ubuntu 11.10 and I'm trying to put music on to my iPod Touch 4Gen running iOS 5.0.1. I have tried every program available in the Ubuntu software center for sycing iPods and I get basically the same response from each one: "[cannot apply changes etc, ect, etc]" I've tried rigorously with Banshee and Rythmbox with no success. I've even tried running iTunes on Windows XP in VirtualBox with no success. I've tried running iTunes through Wine and it results in an error message saying something along the lines of "[Please install Apple Application Support and then reinstall iTunes]". I am considering Jailbreaking my iPod but I cannot find Absinthe that works with my iPod and with Ubuntu. In addition I'm not sure how ** works with Ubuntu. I'm really in a pickle here. It would be ever so helpful if I could indeed have some help with this issue.

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• Unity3D: default parameters in C# script

  - by Heisenbug

  Accordingly to this thread, it seems that default parameters aren't supported by C# script in Unity3D environment. Declaring an optional parameter in a C# scirpt makes Mono Ide complaint about it: void Foo(int first, int second = 10) // this line is marked as wrong inside Mono IDE Anyway if I ignore the error message of Mono and run the script in Unity, it works without notify any error inside Unity Console. Could anyone clarify a little bit this issue? Particularly: Are default parameters allowed inside C# scripts? If yes, are they supported by all platforms? Why Mono complains about them if the actually works?

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• How to fix 'grub error file not found' when installing 12.04?

  - by Tomasz Grabowski

  i'm trying to install Ubuntu. I don't know if it is important, but i'm trying to install it on external HDD. In the end i have external bootable HDD which only displays: error: file not found grub recovery> From the beginning: I've downloaded ubuntu-12.04-desktop-i386.iso I've used LiLi USB Creator (LinuxLive) to create bootable pendrive from that image I've bootet from it, it works I've clicked "Try ubuntu", it works too. I've used GParted to look over drivers (disks) My primary embedded disk is seen as /dev/sda My attached external disk as /dev/sdb My PenDrive as /dev/sdc I've created partitions on /dev/sdb Fist partition for system (over 200GiB) Second was there already (it's xsf, and i don't want to touch it :P) Third is extended partition, with 1 locital partiton (10GiB) for swap I've started installation i've choose "somethin else" in ... i belive secound screeb then is selected /dev/sdb as boot disk for first partiton of /dev/sdb i set i want ext3 file system, i've check "formattin" checkbox, and mount path set to "/" firs logical partiton set as swap partition After installation finished, i restarted my computer. When i boot from my primary disc it's work ok, my previous operating system - vista - works ok. When i set my BIOS to boot from my external disc, i only get that message: error: file not found grub recovery> I've try to reinstall it, but didn't help... In desperation, i've try to read a bit about that "grub recovery" command-line and experiment a bit... I'm not sure if this has had any point, or if it give you some information (notice, that i don't know what i'm doing :P ) when i've type command: insmod (hd1,1)/boot/grub/linux.mod i've get message: unknown filesystem the same with: insmod (hd1,msdos1)/boot/grub/linux.mod the same with: insmod ext3 but i get no message after command: insmod ext2 ... notice that i really don't know what this command exactly do, but than i thought that maybe if i reinstall ubuntu with ext2 filesystem, it will work. I've done that, but symptoms are the same. I've go back to that Live version of ubuntu, filesystem and basics directories seems to be present on /dev/sdb1 ... i'm completely unfamiliar with GRUB. I'm also don't know which wersion of GRUB it is, i hope there is only one version on ubuntu-12.04-desktop-i386.iso Any help? Thax

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• 403 error on index file

  - by John L.

  When I try to access index.py in my server root through http://domain/, I get a 403 Forbidden error, but when I can access it through http://domain/index.py. In my server logs it says "Options ExecCGI is off in this directory: /var/www/index.py". However, my httpd.conf entry for that directory is the same as the ones for other directories, and getting to index.py works fine. My permissions are set to 755 for index.py. I also tried making a php file and naming it index.php, and it works from both domain/ and domain/index.php. Here is my httpd.conf entry: <Directory /var/www> Options Indexes Includes FollowSymLinks MultiViews AllowOverride All Order allow,deny Allow from all AddHandler cgi-script .cgi AddHandler cgi-script .pl AddHandler cgi-script .py Options +ExecCGI DirectoryIndex index.html index.php index.py </Directory> Thanks

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