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Articles indexed in May 2010

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• apache mod_rewrite making permanent url problem

  - by Yc Zhang

  In file .htaccess <IfModule mod_rewrite.c> RewriteEngine on RewriteCond %{REQUEST_FILENAME} !-d RewriteCond %{REQUEST_FILENAME} !-f RewriteRule ^\/*get_post\/(.*)$ get_post.php?slug=$0 [L] </IfModule> If I type http://example.com/get_post/abcde, I get an empty array of $_GET variable. How can I achieve the effect like this: http://example.com/get_post?slug=abcde

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• Why represent shopping carts and order invoices differently in a domain model?

  - by Todd

  I've built some shopping cart systems in the past, but I always designed them such that the final order invoice is just a shopping cart that has been marked as "purchased". All the logic for adding/removing/changing items in a cart is also the logic for the order. All data is stored in the same tables in the database. But it seems this is not the proper way to design an e-commerce site.. Can someone explain the benefit of separating the shopping cart from invoices in the domain model? It seems to me this would lead to a lot of duplicated code, an extra set of tables in the database, and make it harder to maintain in the event the system need to start accommodating more complicated orders (like specifying selected options for an item which may or may not change the price/availability/shipping time of the order). I'm assuming I just haven't seen the light, as every book and other example I see seems to separate these two seemingly similar concerns -- but I can't find any explanation as to the benefit of doing such! It's also the case in the systems that I design that changes are often made after the initial order is confirmed. It's not uncommon for items to be removed, replaced, or added afterwards (but prior to fulfillment).

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• Interpreted languages: The higher-level the faster?

  - by immersion

  I have designed around 5 experimental languages and interpreters for them so far, for education, as a hobby and for fun. One thing I noticed: The assembly-like language featuring only subroutines and conditional jumps as structures was much slower than the high-level language featuring if, while and so on. I developed them both simultaneously and both were interpreted languages. I wrote the interpreters in C++ and I tried to optimize the code-execution part to be as fast as possible. My hypothesis: In almost all cases, performance of interpreted languages rises with their level (high/low). Am I basically right with this? (If not, why?)

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• Is pitch and speed the same thing in audio programming context?

  - by mystify

  Pitch means "perceived frequency". Nice. But when I make pitch very low in OpenAL, sound plays a lot of times longer. If I make it very high, sound plays very short but with high frequency. For me, logically the consequence of making slower or faster. Or is pitch != speed?

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• The Make Web Not War Train

  - by guybarrette

  If you’re from the Toronto area and want to attend the Make Web Not War conference in Montreal and on a tight budget, you may want to ride the DEVTrain from Toronto to Montreal for a mere $50 (roundtrip). All the info here var addthis_pub="guybarrette";

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• Best Server Ghost-Like Tool For Windows

  - by John Dibling

  I'm looking for advice on which tool we should use to clone servers. In the short term, we will be cloning identical hardware but in the long run we may want to create one image and replicate that on a different class of machine. For example, as new servers are released from Dell, we will want to continue to use the same image we already made. Right now our servers are Windows (Server 2008 & Server 2008 R2), but moving forward we may need Linux support as well. Ghost Solution Suite 2.5 seems to be the canonical tool. Are there alternatives? Recommendations/reviews?

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• Cannot access SWITCH thru VPN

  - by MadBoy

  I've VPN connection set up that i connect to company with. I can connect to all devices (other switches, routers, servers from same subnet with same settings just diffrent ip) but I can't connect to NetGear Router GS748Tv3. Settings on switch: IP address 192.168.1.8 Subnet mask 255.255.255.0 Default gateway 192.168.1.1 Management VLAN ID: 0 (1 - 4094 or 0) (0 means all VLANs) Switch has 2 VLAN's configured 1 and 2. I can access this switch thru VPN if i log in to server and from server to switch but this is a little bit slower then normal way. Anything I'm missing?

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• vsftp on CentOS - unable to get a folder list of /var directory

  - by evanmcd

  Hi, I'm just getting started with CentOS and running into a strange issue with vsftp. When I FTP in, then change directory to /var I don't get a folder list. Is there something about CentOS or vsftp in particular that I may be missing that causes this behavior? The permissions on the folder are like others that I am able to see while connected via FTP. Thanks for any help. Evan

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• Looking for Mini itx capable of running Photoshop + Illustrator (cs4 or higher)

  - by drozzy

  Ok, so I want to build a small pc for my gf that she can take with her instead of the crappy laptop that she has. Overall I think the complete system should not weight more than 10 lbs. The requirements are to run at least 4 applications simultaneously, and be able to switch between them with no problems: Photoshop Illustrator Word editor Browser Should be able to handle 1920x1200 resolution. I am currently looking at LGA775 socket as I can just transfer my desktop cpu Q6600 to it. Currently deciding between DQ45EK and DG41TX, but any other suggestions are welcome. So I am thinking something along the lines of: MINI-BOX M350 Case with 90 watt psu Q6600 cpu (my desktop cpu) 2x2GB kingston ram (or similar) Video? Need external or built-in G45 on DQ45EK will do? My primary concern is whether the 90WATT is sufficient of the Q6600? Thanks

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• Using BIND as a Personal DNS Server on Windows XP

  - by Sam

  Hello, My ISP's DNS server is very crappy and I've been trying out various alternatives to it. I came across Treewalk ( http://ntcanuck.com/ ) and BIND, and decided to use Treewalk as it seemed easier. But it's performance hasn't been satisfactory. Can someone please guide me on how to setup BIND on my standalaone Windows XP 3 system which connects to the internet using PPPOE? (Note: I am aware about OpenDNS / Google / other public DNS servers but do not wish to use them).

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• Podcasting: Pipe internet audio to conference calls

  - by Mike Fielden

  I have a podcast and we use Skype and Audio Hijack to record all of us. How would I go about piping audio so the other people on the Skype conference call can hear it real time? I would like a software solution if possible. I realize they are several hardware solutions available.

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• How to send to the "loopback interface"?

  - by windows

  Does it mean the same as send to localhost ?

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• Remove noise from a recording

  - by essamSALAH

  I used to record important technical meetings and demos using Camtasia Studio, using a Mic to capture the speaker voice. Sometimes we invite attendees by asking them to call us in the meeting, and they would call on a cell phone then we switch it to loudspeaker so we can hear and talk to them and also record the conversation on Camtasia. The problem I am having now is that playing back those recording produces the regular noise that results from the microphone being close to the mobile phone (the kind of noise you hear when your mobile phone rings and it is near a speaker). Any advice on removing this noise?

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• Minimum Acceptable Code Coverage Numbers in the real world.

  - by Pita.O

  Hi, I am in the middle of putting together some guidelines around code coverage and I want to specify a number that really makes sense. It's easy to repeat the 100% mantra that I see all over the internet without considering the cost benefit analysis and when diminishing returns actually sets in. I solicit comments from persons who have actually reported code coverage on real-life, medium/large-sized projects. What percentages were you seeing? How much is too much? I really want some balance (in figures) that will help developers produce hight quality code. Is 65% coverage too low to expect? Is 80% too high?

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• MooTools Classes and JsDoc

  - by Joel Alejandro

  I have the following Moo class: Nem.Ui.Window = new Class({ Implements: [Options, Events], options: { caption: "Ventana", icon: $empty, centered: true, id: $empty, width: $empty, height: $empty, modal: false, desktop: $empty, x: $empty, y: $empty, layout: $empty }, initialize: function(options) { this.setOptions(options); /* ... */ }, setHtmlContents: function(content) { /* ... */ }, setText: function(text) { /* ... */ }, close: function(win) { /* ... */ }, /* ... */ }); I want to document it with JsDoc. I read you can use @lends [class].prototype inside new Class and mark initialize with the @constructs tag. How can I mark methods and events such? I.E.: setHtmlContents should be a method, close should be an event. Also, can the elements under options be documented, somehow?

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• xvfb on a machine with a display, can an application run 'in the background?'

  - by marfarma

  I'm setting up to cron a web scraping job, using xvfb, firefox, and watir on my Mac OS X. In testing the script so far, firefox pops up visibly on the local desktop, the watir script executes, and then firefox exits (I quit firefox in my script). I'd like to set the xvfb DISPLAY such that firefox will run, but won't be seen on the local desktop, running 'in the background' so to speak. Nothing I've been able to find online discusses such a possibility - nor explains that it's not possible. Is it possible? If so, what do I need to do to make it work?

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• TDD approach for complex function

  - by jamie

  I have a method in a class for which they are a few different outcomes (based upon event responses etc). But this is a single atomic function which is to used by other applications. I have broken down the main blocks of the functionality that comprise this function into different functions and successfully taken a Test Driven Development approach to the functionality of each of these elements. These elements however aren't exposed for other applications would use. And so my question is how can/should i easily approach a TDD style solution to verifying that the single method that should be called does function correctly without a lot of duplication in testing or lots of setup required for each test? I have considered / looked at moving the blocks of functionality into a different class and use Mocking to simulate the responses of the functions used but it doesn't feel right and the individual methods need to write to variables within the main class (it felt really heath robinson). The code roughly looks like this (i have removed a lot of parameters to make things clearer along with a fair bit of irrelevant code). public void MethodToTest(string parameter) { IResponse x = null; if (function1(parameter)) { if (!function2(parameter,out x)) { function3(parameter, out x); } } // ... // more bits of code here // ... if (x != null) { x.Success(); } }

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• Is there a float equivalent to the standard stdint.h in C/C++?

  - by anachoret

  I am looking for C/C++ language standard headers that define fixed precision floating point types. Do they exist?

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• Implementing "select distinct ... from ..." over a list of Python dictionaries

  - by daveslab

  Hi folks, Here is my problem: I have a list of Python dictionaries of identical form, that are meant to represent the rows of a table in a database, something like this: [ {'ID': 1, 'NAME': 'Joe', 'CLASS': '8th', ... }, {'ID': 1, 'NAME': 'Joe', 'CLASS': '11th', ... }, ...] I have already written a function to get the unique values for a particular field in this list of dictionaries, which was trivial. That function implements something like: select distinct NAME from ... However, I want to be able to get the list of multiple unique fields, similar to: select distinct NAME, CLASS from ... Which I am finding to be non-trivial. Is there an algorithm or Python included function to help me with this quandry? Before you suggest loading the CSV files into a SQLite table or something similar, that is not an option for the environment I'm in, and trust me, that was my first thought.

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• Biased Random Number Generator

  - by cmptrer

  I am looking for a random number generator that can be biased. For instance, say I want a random number between 1-5, with the probability being: 1: Comes up 20% of the time 2: Comes up 10% of the time 3: Comes up 40% of the time 4: Comes up 25% of the time 5: Comes up 5% of the time Is there anything in the standard library, or other libraries out there that would do this? Alternatively, is there an efficient way to do this myself?

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• ASP.Net security using Operations Based Security

  - by Josh

  All the security stuff I have worked with in the past in ASP.Net for the most part has been role based. This is easy enough to implement and ASP.Net is geared for this type of security model. However, I am looking for something a little more fine grained than simple role based security. Essentially I want to be able to write code like this: if(SecurityService.CanPerformOperation("SomeUpdateOperation")){ // perform some update logic here } I would also need row level security access like this: if(SecurityService.CanPerformOperation("SomeViewOperation", SomeEntityIdentifier)){ // Allow user to see specific data } Again, fine grained access control. Is there anything like this already built? Some framework that I can drop into ASP.Net and start using, or am I going to have to build this myself?

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• Why adding custom objects to List<T> in ApplicationSettingsBase via constructor doesn't work?

  - by BadNinja

  This is pretty closely related to another SO question. Using the example below, could someone explain to me why adding a new List<Foo> where each of Foo's properties are explicitly set causes the ApplicationSettingsBase.Save() method to correctly store the data, whereas adding a new Foo to the list via a constructor (where the constructor sets the property values) does not work? Thanks! public class Foo { public Foo(string blah, string doh) { this.Blah = blah; this.Doh = doh; } public Foo() { } public string Blah { get; set; } public string Doh { get; set; } } public sealed class MySettings : ApplicationSettingsBase { [UserScopedSetting] public List<Foo> MyFoos { get { return (List<Foo>)this["MyFoos"]; } set { this["MyFoos"] = value; } } } // Here's the question... private void button1_Click(object sender, EventArgs e) { MySettings mySettings = new MySettings(); // Adding new Foo's to the list like this doesn't work. List<Foo> theList = new List<Foo>() { new Foo("doesn't","work") }; // But doing it like this DOES work. List<Foo> theList = new List<Foo>() { new Foo() {Blah = "DOES", Doh = "work"} }; mySettings.MyFoos = theList; mySettings.Save(); }

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• How can I quickly set the iPhone deployment target in Xcode?

  - by nevan

  I was reading this great article about Base SDK and Deployment targets and decided to try it out myself. The Deployment target seems to be buried in the Build settings, and not that easy to access compared to the Base SDK target (which is right there in the General tab of the project settings). To get to the Deployment settings now I have to Get Info, go to the Build tab, then search for "Deployment". Is there a quick way to check and access the Deployment target in Xcode that I'm missing?

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• How to bundle C code in C shell script?

  - by eSKay

  I have a C shell script that calls two C programs - one after the another with some file handling before, in-between and afterwards. Now, as such I have three different files - one C shell script and 2 .c files. I need to give this script to other users. The problem is that I have to distribute three files - which the users must keep in the same folder and then execute the script. Is there some better way to do this? [I know I can make one C code file out of those two... but I will still be left with a shell script and a C code. Actually, the two C codes do entirely different things... so I want them to be separate]

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• How to use a delay in a swing application

  - by M.R.

  I am building a swing application. At some point, I have to start an "animation": ... jpanel1.setBackground(Color.Black); Delay(milli) jpanel1.setBackground(Color.White); ... and so on. The gui itself and all the logic behind it work.It is just this time depended color-changing that does not. I have read, that swing is not thread safe, but all the examples I found showed me how to start another thread (for example in the background) but never how to stop the current swing-gui thread.

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