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  • Créer un lecteur de flux RSS avec une application iPhone, par Rafael Garcia

    Bonjour, Je vous présente ce tutoriel traduit par ram-0000 intitulé : Créer un lecteur de flux RSS avec une application iPhone Nous avons reçu un certain nombre de demandes pour un tutoriel sur la création d'un lecteur de flux RSS. Cette semaine, Rafael Garcia Leiva va nous montrer comment créer une application iPhone pour lire un flux RSS. Rafael est un développeur expérimenté d'applications iPhone, auteur de plus d'une douzaine de programmes. Actuellement, il travaille comme développeur...

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  • On the Fourth Day of the SQL Series...

    - by andyleonard
    Introduction Brent Ozar ( Blog | @BrentO ) has done it again - started something. This time it's The Twelve Days of SQL Series . I was passed the baton from David Stein ( Blog | @made2mentor ) who covered Day 3 with a tribute to his favorite post . And Now, My Selection: I liked Rafael Salas' ( Blog | @RafSalas ) post entitled Denali CTP 1: SSIS Parameters – Bring Them On! Rafael is a friend and fellow SSIS guy. In this post he does a good job pointing out the differences between SSIS Parameters...(read more)

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  • Android SDK PATH Error: doesn´t find home directory [migrated]

    - by THeo Oliveira
    I use Ubuntu 12.10 and I tried to follow this guide Install android sdk and eclipse in Ubuntu 12.04 but I keep getting this error: Error: The AVD manager normally uses the user's profile directory to store AVD files. However it failed to find the default profile directory. To fix this, please set the environment variable ANDROID_SDK_HOME to a valid path such as ¨~¨. Any ideas how can I fix this?

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  • Android SDK PATH Error: doesn´t find home directory

    - by THeo Oliveira
    I use Ubuntu 12.10 and I tried to follow this guide Install android sdk and eclipse in Ubuntu 12.04 but I keep getting this error: Error: The AVD manager normally uses the user's profile directory to store AVD files. However it failed to find the default profile directory. To fix this, please set the environment variable ANDROID_SDK_HOME to a valid path such as ¨~¨. Any ideas how can I fix this?

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  • Improve speed of "start menu" in Linux Mint 10 - Ubuntu 10.10 derivative [closed]

    - by Gabriel L. Oliveira
    I have a global menu (including application, administration and system tabs) that is taking too much time (for me) to load (about 2.5 seconds). Of course, this time is taken only during first start. After it have loaded, next times are better ( less than 0.2 miliseconds) The menu was taking more time before (about 5 seconds), and I found that was because of the 'Other' part of the menu, that included many applications installed with Wine, so I removed all of them (I didn't need them at all). I have a "normal" knowledge of programming, and I think that the process of starting the menu for the first time has some kind of "cache function", that tries to find which apps are present that need to be placed under menu to be shown to user. But didn't found this function so that I could analyze in details what he is doing (if searching for files under "~/.local/share/applications" or anything else). Also, I found that hitting "Alt-F2" also fires this "cache function", because after waiting it to load, the process of opening the menu took less than 0.2 miliseconds. So, could anyone help me in order to reduce this time? I found on internet that some user could reduce the time by resizing the icons of applications. But found here that most of my icons are already at 25x25 size. Any other idead? Maybe a multiprocess to load it, or include it under startup... don't know. Ps: Sorry if this is an awkward question, but I just do not like waiting for things to happen, and think that this process should be smoother than it's now. Also, thanks in advance!

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  • sudo apt-get install -f doesn't fix broken packages. And now?

    - by Du Oliveira
    $ sudo apt-get install -f [sudo] password for ...: Lendo listas de pacotes... Pronto Construindo árvore de dependências Lendo informação de estado... Pronto Corrigindo dependências... Pronto Os seguintes pacotes foram instalados automaticamente e já não são necessários: python-pyasn1 libconfig++8 python-twisted-runner linux-headers-3.0.0-12 libvamp-sdk2 python-twisted-mail libgnomecanvasmm-2.6-1c2a python-twisted-lore python-twisted-conch python-twisted-news python-twisted-words python-twisted libffado2 linux-headers-3.0.0-12-generic libaubio2 Use 'apt-get autoremove' para removê-los. Os pacotes extra a seguir serão instalados: libmpeg3cine Os NOVOS pacotes a seguir serão instalados: libmpeg3cine 0 pacotes atualizados, 1 pacotes novos instalados, 0 a serem removidos e 0 não atualizados. 2 pacotes não totalmente instalados ou removidos. É preciso baixar 0 B/2.573 kB de arquivos. Depois desta operação, 6.762 kB adicionais de espaço em disco serão usados. Você quer continuar [S/n]? S (Lendo banco de dados ... 317732 ficheiros e directórios actualmente instalados.) Desempacotando libmpeg3cine (de .../libmpeg3cine_1%3a2.2-0.3~ppa1~oneiric1_i386.deb) ... dpkg: erro processando /var/cache/apt/archives/libmpeg3cine_1%3a2.2-0.3~ppa1~oneiric1_i386.deb (--unpack): a tentar sobre-escrever '/usr/bin/mpeg3cat', que também está no pacote mpeg3-utils 1.5.4-5ubuntu1 Erros foram encontrados durante o processamento de: /var/cache/apt/archives/libmpeg3cine_1%3a2.2-0.3~ppa1~oneiric1_i386.deb E: Sub-process /usr/bin/dpkg returned an error code (1) .....:~$ apt-get autoremove E: Não foi possível abrir arquivo de trava /var/lib/dpkg/lock - open (13: Permissão negada) E: Não foi possível travar o diretório administrativo (/var/lib/dpkg/), você é root?

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  • VirtualBox Share permissions

    - by Eduardo Oliveira
    at the moment i'm running ubuntu server 12.04 on top of a virtual box running as service in M$ w7x64, I've configured the shares on fstab with E /media/E vboxsf auto,rw,uid=1000,gid=1000 0 0 the mount is ok drwxrwxrwx 1 knoker knoker 16384 Sep 1 20:02 E but i cant change the permissions inside of /media/E ,chmod runs but doesn't do nothing. on a specific case /media/E/Docs/Downloads i have dr-xr-xr-x 1 knoker knoker 163840 Sep 1 19:30 Downloads and since i cant seem to be able to change from linux i tried it on the windows, and all users listed have full control... Any ideas on what is happening? Best Regards, Knoker

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  • Switch vs Polymorphism when dealing with model and view

    - by Raphael Oliveira
    I can't figure out a better solution to my problem. I have a view controller that presents a list of elements. Those elements are models that can be an instance of B, C, D, etc and inherit from A. So in that view controller, each item should go to a different screen of the application and pass some data when the user select one of them. The two alternatives that comes to my mind are (please ignore the syntax, it is not a specific language) 1) switch (I know that sucks) //inside the view controller void onClickItem(int index) { A a = items.get(index); switch(a.type) { case b: B b = (B)a; go to screen X; x.v1 = b.v1; // fill X with b data x.v2 = b.v2; case c: go to screen Y; etc... } } 2) polymorphism //inside the view controller void onClickItem(int index) { A a = items.get(index); Screen s = new (a.getDestinationScreen()); //ignore the syntax s.v1 = a.v1; // fill s with information about A s.v2 = a.v2; show(s); } //inside B Class getDestinationScreen(void) { return Class(X); } //inside C Class getDestinationScreen(void) { return Class(Y); } My problem with solution 2 is that since B, C, D, etc are models, they shouldn't know about view related stuff. Or should they in that case?

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  • What could be the reason for my resolution to be right running 11.10 on VirtualBox and not on machine?

    - by Hadrian de Oliveira
    When I install Ubuntu 11.10 on my VirtualBox (running on Windows 7) and update the packages, it recognizes the display as the VirtualBox display, and gives me the options of various resolutions, one of them being right for my display, all works well. But then, when i install it on my machine (like was Windows 7) it doesn't give me the resolution options, even with the system updated and the openchrome graphics driver installed (which was also when running on Virtualbox). What could be the reason for this happening? (Could the VB guest software influence on this?)

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  • How to style this form using CSS ? [closed]

    - by Rafael
    Hi all ,i'm a beginner at CSS and trying to do a NETTUTS , but there's a portion in the webpage that i don't know what exactly to do in CSS to make it look right ... I just can't get this input text boxes, textarea and the button to be aligned like that , and to be honest the tutor isn't doing a great job to clearing stuff out Using alternative and absolute positioning, and setting top and right spacing is kinda no a good idea i think ... I'm trying to align them using FlexBox feature but don't know why those elements are not moving at all ... Here's my HTML & CSS3 code (for chrome) : <section id="getAfreeQuote"> <h2>GET A FREE QUOTE</h2> <form method="post" action="#"> <input type="text" name="yourName" placeholder="YOUR NAME"/> <input type="email" name="yourEmail" placeholder="YOUR EMAIL"/> <textarea name="projectDetails" placeholder="YOUR PROJECT DETAILS."></textarea> <input type="text" name="timeScale" placeholder="YOUR TIMESCALE"/> <button>Submit</button> </form> #getAfreeQuote form { display:-webkit-box; -webkit-box-orient:vertical; height:500px; } #getAfreeQuote input[name="yourName"]{ -webkit-box-ordinal-group:1; } #getAfreeQuote input[name="yourEmail"]{ -webkit-box-ordinal-group:1; } #getAfreeQuote textarea{ -webkit-box-ordinal-group:2; } #getAfreeQuote input[name="timeScale"]{ -webkit-box-ordinal-group:3; } #getAfreeQuote button { -webkit-box-ordinal-group:4; } and the result :

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  • What is the best way to evaluate new programmers?

    - by Rafael
    What is the best way to evaluate the best candidates to get a new job (talking merely in terms of programming skills)? In my company we have had a lot of bad experiences with people who have good grades but do not have real programming skills. Their skills are merely like code monkeys, without the ability to analyze the problems and find solutions. More things that I have to note: The education system in my country sucks--really sucks. The people that are good in this kind of job are good because they have talent for it or really try to learn on their own. The university / graduate /post-grad degree doesn't mean necessarily that you know exactly how to do the things. Certifications also mean nothing here because the people in charge of the certification course also don't have skills (or are in low paying jobs). We need really to get the good candidates that are flexible and don't have mechanical thinking (because this type of people by experience have a low performance). We are in a government institution and the people that are candidates don't necessarily come from outside, but we have the possibility to accept or not any candidates until we find the correct one. I hope I'm not sounding too aggressive in my question; and BTW I'm a programmer myself. edit: I figured out that asked something really complex here. I will un-toggle "the correct answer" only to let the discussion going fluent, without any bias.

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  • Installing on a mac without a CD burner or USB boot

    - by Rafael
    I am new to Ubuntu, i installed it in an old PC and now it works GREAT!!! My Macbook pro has a glitch and refuses to run Mac OS X, so i installed Windows, and i really want Ubuntu since Windows is not for me. Here's the problem(s) my drive only READS DVDs, if i put a blank in it, it will ignore it and my mac has the updated EFI, so no booting from a USB connected device! I also tried Wubi, but then i cant make it a FULL partition and get rid of windows!!! Thank you!

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  • Critical Threads Optimization

    - by Rafael Vanoni
    Background One of the more common issues we've been seeing in the field is the growing difficulty in optimizing performance of multi-threaded applications. A good portion of this difficulty is due to the increasing complexity of modern processors that present various degrees of sharing relationships between hardware components. Take any current CMT processor and you'll find any number of CPUs sharing execution pipelines, floating point units, caches, etc. Consequently, applying the traditional recipe of one software thread for each CPU will have varying degrees of success, according to the layout of the underlying hardware. On top of this increasing complexity we've also seen processors with features that aim at dynamically resourcing software threads according to their utilization. Intel's Turbo Boost allows processors to increase their operating frequency if there is enough thermal headroom available and the processor isn't fully utilized. More recently, the SPARC T4 processor introduced dynamic threading, allowing each core to dynamically allocate more resources to its active CPUs. Both cases are in essence recognizing that current processors will be running a wide mix of workloads, some will be designed for throughput, others for low latency. The hardware is providing mechanisms to dynamically resource threads according to their runtime behavior. We're very aware of these challenges in Solaris, and have been working to provide the best out of box performance while providing mechanisms to further optimize applications when necessary. The Critical Threads Optimzation was introduced in Solaris 10 8/11 and Solaris 11 as one such mechanism that allows customers to both address issues caused by contention over shared hardware resources and explicitly take advantage of features such as T4's dynamic threading. What it is The basic idea is to allow performance critical threads to execute with more exclusive access to hardware resources. For example, when deploying an application that implements a producer/consumer model, it'll likely be advantageous to give the producer more exclusive access to the hardware instead of having it competing for resources with all the consumers. In the case of a T4 based system, we may want to have a producer running by itself on a single core and create one consumer for each of the remaining CPUs. With the Critical Threads Optimization we're extending the semantics of scheduling priorities (which thread should run first) to include priority over shared resources (which thread should have more "space"). Now the scheduler will not only run higher priority threads first: it will also provide them with more exclusive access to hardware resources if they are available. How does it work ? Using the previous example in Solaris 11, all you'd have to do would be to place the producer in the Fixed Priority (FX) scheduling class at priority 60, or in the Real Time (RT) class at any priority and Solaris will try to give it more "hardware space". On both Solaris 10 8/11 and Solaris 11 this can be achieved through the existing priocntl(1,2) and priocntlset(2) interfaces. If your application already assigns these priorities to performance critical threads, there's no additional step you need to take. One important aspect of this optimization is that it requires some level of idleness in the system, either as a result of sizing the application before hand or through periods of transient idleness during runtime. If the system is fully committed, the scheduler will put all the available CPUs to work.Best practices If you're an application developer, we encourage you to look into assigning the right priorities for the different threads in your application. Solaris provides different scheduling classes (Time Share, Interactive, Fair Share, Fixed Priority and Real Time) that offer different policies and behaviors. It is not always simple to figure out which set of threads are critical to the performance of a workload, and it may not always be feasible to take advantage of this optimization, but we believe that this can be correctly (and safely) done during development. Overall, the out of box performance in Solaris should meet your workload's requirements. If you are looking into that extra bit of performance, then the Critical Threads Optimization may be what you're looking for.

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  • Ubuntu 14.04 Bluetooth Magic Mouse doesn't pair (No agent available)

    - by Rafael Xavier
    Mouse gets discovered. Although, it doesn't pair. /var/log/syslog: Apr 23 10:05:15 xavier bluetoothd[9873]: No agent available for request type 0 Apr 23 10:05:15 xavier bluetoothd[9873]: btd_event_request_pin: Operation not permitted Apr 23 10:05:15 xavier bluetoothd[9873]: Connection refused (111) It's worth saying that: Keyboard has paired and it's working just fine though; Mouse used to work just fine in Ubuntu 12.04, and 13, and it works when I reboot on Mac; This is the hci device. $ hcitool dev Devices: hci0 E0:F8:47:3A:3F:47 How to get it working?

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  • Embed Unity3D and load multiple games from a single app

    - by Rafael Steil
    Is is possible to export an entire unity3d project/game as an AssetBundle and load it on iOS/Android/Windows on an app that doesn't know anything about such game beforehand? What I have in mind is something like the web plugin does - it loads a series of .unity3d files over http, and render inline in the browser window. Is it even possible to do something closer for iOS/Android? I have read a lot of docs so far, but still can't be sure: http://floored.com/blog/2013/integrating-unity3d-within-ios-native-application.html http://docs.unity3d.com/Manual/LoadingResourcesatRuntime.html http://docs.unity3d.com/Manual/AssetBundlesIntro.html The code from the post at http://forum.unity3d.com/threads/112703-Override-Unity-Data-folder-path?p=749108&viewfull=1#post749108 works for Android, but how about iOS and other platforms?

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  • Cheap sound on speakers - Dell XPS L502X

    - by Rafael
    I have a new machine that comes with JBL 2.1 Speakers with Waves Maxx Audio 3. On Windows it sounds perfect, though in Ubuntu 12.04 I get cheap/sound with simple mp3 files. I have tried a few things on different blogs but no luck so far. Any ideas? aplay -l **** List of PLAYBACK Hardware Devices **** card 0: PCH [HDA Intel PCH], device 0: ALC665 Analog [ALC665 Analog] Subdevices: 1/1 Subdevice #0: subdevice #0 card 0: PCH [HDA Intel PCH], device 1: ALC665 Digital [ALC665 Digital] Subdevices: 1/1 Subdevice #0: subdevice #0 card 0: PCH [HDA Intel PCH], device 3: HDMI 0 [HDMI 0] Subdevices: 1/1 Subdevice #0: subdevice #0 card 1: N700 [Logitech Speaker Lapdesk N700], device 0: USB Audio [USB Audio] Subdevices: 1/1 Subdevice #0: subdevice #0

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  • Can I get the Waves Maxx speaker effects to work in Ubuntu?

    - by Rafael
    I have a new machine that comes with JBL 2.1 Speakers with Waves Maxx Audio 3. On Windows it sounds perfect, though in Ubuntu 12.04 I get cheap/sound with simple mp3 files. I have tried a few things on different blogs but no luck so far. Any ideas? aplay -l **** List of PLAYBACK Hardware Devices **** card 0: PCH [HDA Intel PCH], device 0: ALC665 Analog [ALC665 Analog] Subdevices: 1/1 Subdevice #0: subdevice #0 card 0: PCH [HDA Intel PCH], device 1: ALC665 Digital [ALC665 Digital] Subdevices: 1/1 Subdevice #0: subdevice #0 card 0: PCH [HDA Intel PCH], device 3: HDMI 0 [HDMI 0] Subdevices: 1/1 Subdevice #0: subdevice #0 card 1: N700 [Logitech Speaker Lapdesk N700], device 0: USB Audio [USB Audio] Subdevices: 1/1 Subdevice #0: subdevice #0

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  • Is the wireless driver from Live USB different from the standard install?

    - by Rafael Magalhães
    Linux newbie here. I've been trying to use Ubuntu (x64) as my main OS since 11.10, but my wireless connection on it has been very unstable, droping every other 5-10 mins. For this reason I see myself forced to use Windows 7 (dual booting), where connection works flawlessly -- which really bothers me. My card is an Atheros 9k, which claims a reasonable amount of wireless complaints on Ubuntu forums. I've tried every suggestion given on past questions to this site but to no avail. However, while running Ubuntu Live USB for some of the tests, I noticed that my wireless connection never failed on it and wondered if its network configuration differs from the one on the default Ubuntu install. If this is the case, how could I reproduce the Live USB network environment on my hard drive install?

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  • Issues with the intended behavior of a Service layer?

    - by Rafael Cichocki
    This analysis makes sense, and states anything that avoids code duplication and simplifies maintenance speaks for a service layer. What is the technical behavior? When a service client references a service, does it do so at runtime, or does it happen at compile time? When I change something in the service layer code, will this change be automatically taken into account in all it's clients, or do they need to be individually recompiled? How does this make sense from a testing point of view - I have working code, based on some code from a service, but if that service changes, my code might break?!

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  • How to handle encryption key conflicts when synchronizing data?

    - by Rafael
    Assume that there is data that gets synchronized between several devices. The data is protected with a symmetric encryption algorithm and a key. The key is stored on each device and encrypted with a password. When a user changes the password only the key gets re-encrypted. Under normal circumstances, when there is a good network connection to other peers, the current key gets synchronized and all data on the new device gets encrypted with the same key. But how to handle situations where a new device doesn’t have a network connection and e.g. creates its own new, but incompatible key? How to keep the usability as high as possible under such circumstances? The application could detect that there is no network and hence refuse to start. That’s very bad usability in my opinion, because the application isn’t functional at all in this case. I don’t consider this a solution. The application could ignore the missing network connection and create a new key. But what to do when the application gains a network connection? There will be several incompatible keys and some parts of the underlying data could only be encrypted with one key and other parts with another key. The situation would get worse if there would be more keys than just two and the application would’ve to ask every time for a password when another object that should get decrypted with another key would be needed. It is very messy and time consuming to try to re-encrypt all data that is encrypted with another key with a main key. What should be the main key at all in this case? The oldest key? The key with the most encrypted objects? What if the key got synchronized but not all objects that got encrypted with this particular key? How should the user know for which particular password the application asks and why it takes probably very long to re-encrypt the data? It’s very hard to describe encryption “issues” to users. So far I didn’t find an acceptable solution, nor some kind of generic strategy. Do you have some hints about a concrete strategy or some books / papers that describe synchronization of symmetrically encrypted data with keys that could cause conflicts?

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  • iChat Screen Sharing - Keyboard shortcut to switch back to my computer without messing with the mous

    - by Sergio Oliveira Jr.
    When you are watching a screen sharing session commanded by the other user, in other words, you are watching the other user doing stuff in his computer, how do I switch back to my computer without disrupting the other user by stealing the mouse to click on the "My Computer" window? Put simply: To go back to my computer I have to click in the "My computer" little window at the bottom, but that requires me to use the mouse which is being used by the other user. There must be a way to use a keyboard shortcut to perform that action without bothering the other user who is using the mouse to do something important. Anyone? Thanks, -Sergio

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  • Just want to send emails from my Ubuntu Server. What simple SMTP server solution to use?

    - by Sergio Oliveira Jr.
    Basically I have a Ubuntu Server machine and I would like an idiot-proof solution for sending emails from my website that is also running in this same machine. My doubts are: 1) Should I use postfix or there are more simple solutions for an smtp server? 2) Do I need to be able to receive emails as well? I just want to send emails... 3) I did I simple test with postfix that came with my Ubuntu server and the email got sent, but it went to the spam box of my gmail. Anyway to avoid the spam box? 4) The email sender was [email protected]. How do I change that? Thanks very much! -Sergio

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  • Reserving an IP with Netgear router from Time Warner

    - by Sergio Oliveira Jr.
    I tried everything but keep getting the following error: "Duplicated MAC address". Nothing is duplicated. I disconnected the PC that I would like to assign the IP. Basically this is important as I will configure some port forwarding and my notebook must always get the same IP from DHCP. This is called DHCP reservation but apparently is not working on this router. Has anyone being luck to have this working? The model is CG814WG and you have to click on LAN IP under web administration, -Sergio

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