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Articles indexed Saturday March 27 2010

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• How to properly design a simple favorites and blocked table?

  - by Nils Riedemann

  Hey, i am currently writing a webapp in rails where users can mark items as favorites and also block them. I came up two ways and wondered which one is more common/better way. 1. Separate join tables Would it be wise to have 2 tables for this? Like: users_favorites - user_id - item_id users_blocked - user_id - item_id 2. single table users_marks (or so) - users_id - item_id - type (["fav", "blk"]) Both ways seem to have advantages. Which one would you use and why?

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• How can we detect Mysql Injection?

  - by jasmine

  A site has blocked with google. There is a site for this issue: http://25yearsofprogramming.com/blog/20070705.htm How can we detect mysql injection? Thanks in advance.

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• BackgroundWorker vs background Thread

  - by freddy smith

  I have a stylistic question about the choice of background thread implementation I should use on a windows form app. Currently I have a BackgroundWorker on a form that has an infinite (while(true)) loop. In this loop I use WaitHandle.WaitAny to keep the thread snoozing until something of interest happens. One of the event handles I wait on is a "stopthread" event so that I can break out of the loop. This event is signaled when from my overridden Form.Dispose(). I read somewhere that BackgroundWorker is really intended for operations that you dont want to tie up the UI with and have an finite end - like downloading a file, or processing a sequence of items. In this case the "end" is unknown and only when the window is closed. Therefore would it be more appropriate for me to use a background Thread instead of BackgroundWorker for this purpose?

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• Receiving broadcast messages

  - by Prasad

  Hi, I'm trying to receive broadcast messages using C# code in an ISDN network with BRI interface at my end. I see the packets sent to the broadcast ip address (239.255.255.255) on some ports using Comm View tool. But when I try to listen to this IP address, it says the address is not in a valid context. But when I send broadcast messages to 255.255.255.255 on a port, I can receive those messages with the below code.. What could be the problem with this ip address - 239.255.255.255 ? The code I use to listen to broadcast messages is.. UdpClient udp = new UdpClient(); IPEndPoint receiveEndPoint = new IPEndPoint(IPAddress.Any, 8013); // If I use IPAddress.Parse("239.255.255.255") to listen to, // it says "the address is not in a valid // context." udp.Client.Bind(receiveEndPoint); udp.BeginReceive(_Callback, udp); static private void _Callback(IAsyncResult iar) { try { UdpClient client = (UdpClient)iar.AsyncState; client.BeginReceive(_Callback, client); IPEndPoint ipRemote = new IPEndPoint(IPAddress.Any, 8013); byte[] rgb = client.EndReceive(iar, ref ipRemote); Console.WriteLine("Received {0} bytes: \"{1}\"", rgb.Length.ToString(), Encoding.UTF8.GetString(rgb)); } catch (ObjectDisposedException) { Console.WriteLine("closing listening socket"); } catch (Exception exc) { Console.WriteLine("Listening socket error: \"" + exc.Message + "\""); } } There are packets sent to the broadcast ipaddress (239.255.255.255) which I can see in Commview tool, but can't receive them from the code... Can anybody help me out please? Thanking you in advance, Prasad Kancharla.

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• Chrome + jQuery hide/show inline

  - by Parhs

  Hello I have these things <ul class="ul_std" style="float:right"> <li class="action_buttons" ><a id="button_deleteNormal" class="button_small button_small_red" >??a??af?</a></li> <li class="action_buttons"><a id="button_editCancel" class="button_small" >?????s? ???p?p???s??</a></li> <li class="action_buttons"><a id="button_editNormal" class="button_small" >???p?p???s?</a></li> <li class="action_buttons" style="margin-right:0" ><a id="button_addNormal" class="button_small">???s????</a></li> </ul> The problem is that i hide all of them except the anchor with id = button_addNormal at $(document).ready()... Everything works fine but at chrome when i want to show them ,it displays them as display:inline and not as display:inline-block ... The css class button_small have display:inline-block.... Firefox,IE 6+ works ok... Havent tested on safari but i hope that it would be ok... Why chrome kills inline-block? The solution was to put .css("display","inline-block") instead of .show()

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• UI fonts and languages

  - by Kai Sellgren

  I am developing a multilingual web application that has a nice looking UI. I thought using CSS 3's font-face property to make it even nicer UI, but I'm not really sure if that's a good idea. According to some people I have talked to, different languages need different fonts. This means that there is no single font that can display characters of all languages, because the same character may look different across languages. For example, according to Wikipedia, the Unicode code point U+4EE4 looks different in Korean and Japanese languages. So my question is, would it make most sense to contain the fonts within the language packs -- or within the themes of my UI?

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• Getting more helpful tab completion prompts in bash?

  - by Rory McCann

  Let's say I have a directory with a few files in it like this: $ ls file1 file2 file3 And I want to do some tab completion in bash: $ cat file<tab> file1 file2 file3 I remember seeing someone doing tab completion and the shell bolded the next parts, so in this case, it would bold the 1, 2 and 3 of the filename so it'll look like this: file**1** file**2** file**3** which will tell you what you should type in next. I think this was a feature of zsh, but is there any way to get it in bash?

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• How to copy a folder with many files with integrity check?

  - by RafaelM

  I just got a new hard drive and I want to move many of the folders from the old hard drive to the new one, but I want to make sure everything is copied over correctly. I tried using md5summer to generate md5 sums of the original files, copied files over and then tried to compare md5 sums of both sets of files. This took ages because there are many large video files. Is there any software I can use to make this process as painless as possible? I just need basic file integrity checking. Thanks in advance

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• Which Wiki Package does this site use ?

  - by asksuperuser

  Which Wiki Package does http://wiki.openid.net/ use ?

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• Showing Image in Frame ActiveX control

  This artical describes how the image can be shown in Frame ActiveX control with proper size.

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• What is the best php encoder software ?

  - by question_about_the_problem

  What is the best php encoder software? http://www.freedownloadmanager.org/downloads/php_encoder_software/ http://forums.digitalpoint.com/showthread.php?t=596680 or another. Everybody say Zend Guard. But you can decode/decript zend's files at the page http://www.showmycode.com/ I think, SourceGuardian is good. But I'm not so sure.

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• Aspiring Web Developer

  - by ihaveitnow

  Hi guys, I want to be a web developer and mobile web developer...I know HTML Iv done some research and read that XML and XHTML are necessary. Are there any other languages that I need to know? Would knowledge of Flash help me in my quest? I also want to become an Android App developer :) (go open-source!) But thats for a different post. I hope I can make links within this community, thanks for reading and even more for responses.

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• Grails or Play! for an ex-RoR developer ?

  - by Kedare

  Hello, I plan to begin learning a Java web framework (I love the Java API), I already used Rails and Django. I want something close to Java, but without all the complexity of J2EE. I've found 2 framework that could be good for me : Grails : Grails looks great, it use Groovy that is better than Java for web application (I think..), but it's slower, that use pure-java components (Hibernate, Strut, Spring), it looks pretty simple to deploy (send .war and it's ok !), the GSP is great ! It's a bit harder to debug (need to restart the server at each modification, and the stacktrace is a mix of Java and Groovy stack that is not always understandable..) Play! : This framework also looks great, it's faster than Grails (It's use directly Java), but I don't really like how it use Java, it modify the source code to transform the properties call as setXXX/getXXX, I'm not kind of that... The framework also have caching function that Grails don't (alreary) has. I don't really like the Template Engine. It's also easer to debug (no need to restart the server, and the stacktrace is clear) What do you recommend for ? I am looking for something easy to learn (I used a lot ruby and java, but a little bit java (But I love the Java API)), that is full featured (That's no a problem with all the Java Library availables, but if it's bundle and integrated I prefer), that scale and that is not too slow (faster than ruby), and if possible I would want something with a decent community to easily find support and answer to my questions ;) PS: No JRuby on Rails Thank you !

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• Sinatra and Markaby: "Template Engine Not Found"

  - by marienbad

  Using the standard gem for using Markaby with Sinatra, listed at http://www.sinatrarb.com/extensions-wild.html sudo gem install markaby Password: Successfully installed builder-2.1.2 Successfully installed markaby-0.5 2 gems installed sudo gem install sbfaulkner-sinatra-markaby -s http://gems.github.com Password: Successfully installed sbfaulkner-sinatra-markaby-0.9.2.2 1 gem installed require 'rubygems' require 'sinatra' require 'sinatra/markaby' get '/' do markaby :template end RuntimeError at / Template engine not found: mab

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• How to identify what function call raise an exception in Python?

  - by boos

  i need to identify who raise an exception to handle better str error, is there a way ? look at my example: try: os.mkdir('/valid_created_dir') os.listdir('/invalid_path') except OSError, msg: # here i want i way to identify who raise the exception if is_mkdir_who_raise_an_exception: do some things if is_listdir_who_raise_an_exception: do other things .. how i can handle this, in python ?

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• XML based WCF service layer

  - by blockoutall

  Hi Guys, we are in the process of desigining a solution as : PL(Sliver Light) | SL(??wcf??) | BL(WWF) | DL(Entity Framework) during this process our thought is decouple the PL & SL ,so we thought of going with the XML based services Can u guys suggest what would be the better solution for desiging the SL(using WCF)which can do the transctions done through XML using WCF

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• Algorithm or Service to provide a rank of some link

  - by khelll

  I'm seeking any implemented algorithm or even a service that I can provide it with a link and it provide back a measurement or a rank for that link in terms of popularity or hotness.

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• Textarea to paragraphs

  - by zaf

  When I have to render textarea content to the front end I usually pass it thru a function that converts newlines to <br/> tags and double newlines signal paragraph tags so blocks of text get surrounded by <p> and </p> tags. To save time I usually use a ready made PHP function from the wordpress codebase. You can get the link from the man himself: http://ma.tt/scripts/autop/ If you check it out you'll see it does some heavy lifting with about 20 regular expressions. I know I could use a wysiwyg editor (like TinyMCE or CKEditor) that can format the data on the client and then send it to the server (most of them add <p>..</p> tags by default) but I want to know the experience of others in handling raw textarea input and then displaying it on the front end.

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• how to edit a text message ( sms ) as it arrives in windows mobile 6 using managed code

  - by x86shadow

  I want to make an application to be installed on two pocket PCs and send Encrypted text messages and receive and decrypt them on the other device. I already made an application that gets special text messages ( starting with !farenc! ) and I know how to Encrypt/Decrypt the messages as well but I don't know how to edit a text message as it's arrive ( for decryption ). please help. thanks in advance and sorry for my bad English using System; using System.Linq; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Drawing; using System.Text; using System.Windows.Forms; using Microsoft.WindowsMobile; using Microsoft.WindowsMobile.PocketOutlook; using Microsoft.WindowsMobile.PocketOutlook.MessageInterception; namespace SMSDECRYPT { public partial class Form1 : Form { MessageInterceptor _SMSCatcher = new MessageInterceptor(InterceptionAction.Notify, true); MessageCondition _SMSFilter = new MessageCondition(); public Form1() { InitializeComponent(); _SMSFilter.Property = MessageProperty.Body; _SMSFilter.ComparisonType = MessagePropertyComparisonType.StartsWith; _SMSFilter.CaseSensitive = true; _SMSFilter.ComparisonValue = "!farenc!"; _SMSCatcher.MessageCondition = _SMSFilter; _SMSCatcher.MessageReceived += new MessageInterceptorEventHandler(_SMSCatcher_MessageReceived); } private void Form1_Load(object sender, EventArgs e) { //... } void _SMSCatcher_MessageReceived(object sender, MessageInterceptorEventArgs e) { SmsMessage mySMS = (SmsMessage)e.Message; string sms = mySMS.Body.ToString(); sms = sms.Substring(8); //Decryption //... //Update the received message and replace it with the decrypted text //!!!HELP!!! } } }

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• How to target specific letter/word with jquery?

  - by Gal

  As a mere example, I want to apply the class "fancy" to all occurrences of the sign "&" in the document. The CSS: .fancy { font-style: italic; } So a text that looks like this: Ben & Jerry's would be manipulated by jquery to this: Ben <span class="fancy">&</span> Jerry's Is there a function to target specific words/phrases/letters like this?

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• Django Foreign key queries

  - by Hulk

  In the following model: class header(models.Model): title = models.CharField(max_length = 255) created_by = models.CharField(max_length = 255) def __unicode__(self): return self.id() class criteria(models.Model): details = models.CharField(max_length = 255) headerid = models.ForeignKey(header) def __unicode__(self): return self.id() class options(models.Model): opt_details = models.CharField(max_length = 255) headerid = models.ForeignKey(header) def __unicode__(self): return self.id() If there is a row in the database for table header as Id=1, title=value-mart , createdby=CEO How do i query criteria and options tables to get all the values related to header table id=1 Also can some one please suggest a good link for queries examples, Thanks..

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• cygwin support for ucontext.h user context switching

  - by Yuval A

  It appears that cygwin doesn't support user context switching (supported by ucontext.h). Given I need to developed a user-context switching application under cygwin, is there any solution for this?

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• Forward traffic between two VLANs.

  - by Michael

  I have a small network with two VLANs. One is our internal network for basic file sharing, etc and the other is a public wifi network for our customers. The internal network is configured as 192.168.1.x and the public wifi is 192.168.11.x. We have one printer at 192.168.1.50. I would like to be able to have that printer available to our customer at 192.168.11.50. I suspect it can be done with iptables, but I'm brand new to it and I just can seem to work out the syntax. Can anyone offer any help? Oh, this is all running on a wrt54g router running Tomato.

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• Disable static content caching in IIS 7

  - by Lee Richardson

  I'm a developer having what should be a relatively simple problem in IIS 7 on Windows Server 2008 R2. The problem is that IIS 7 is overzealously caching all static content on the server. It's caching all .html and .js content and not noticing when the content changes on disk unless I iisreset. I've tried the following: Deleting the local cache in my browser (I'm 99% positive this is a server caching issue) In IIS Admin in OutputCaching adding an .html extension and unchecking "User mode caching" and unchecking "Kernel-mode caching" In IIS Admin in OutputCaching adding an .html extension and checking "User mode caching" and selecting the radio for "Prevent all caching" In IIS Admin editing Output Cache Feature settings and unchecking "Enable cache" and "Enable kernel cache under OutputCaching. Running "C:\Windows\System32\inetsrv\config\appcmd set config "SharePoint - 80" -section: system.webServer/caching -enabled:false" Looking through applicationHost.config and disabling anything related to caching I could find. Nothing seems to work. I'm getting very frustrated. Can anyone please help?

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• QoS for Cisco Router to Prioritize Voice and Interactive Traffic

  - by TJ Huffington

  I have a Cisco 891W NATing Voice and Data to the internet over a 10mbit/2mbit connection. Voice traffic gets degraded when I upload large files. Pings time out as well. I tried to configure a QoS policy but it's basically not doing anything. Voice traffic still degrades when upload bandwidth gets saturated. Here is my current configruation: class-map match-any QoS-Transactional match protocol ssh match protocol xwindows class-map match-any QoS-Voice match protocol rtp audio class-map match-any QoS-Bulk match protocol secure-nntp match protocol smtp match protocol tftp match protocol ftp class-map match-any QoS-Management match protocol snmp match protocol dns match protocol secure-imap class-map match-any QoS-Inter-Video match protocol rtp video class-map match-any QoS-Voice-Control match access-group name Voice-Control policy-map QoS-Priority-Output class QoS-Voice priority percent 25 set dscp ef class QoS-Inter-Video bandwidth remaining percent 10 set dscp af41 class QoS-Transactional bandwidth remaining percent 25 random-detect dscp-based set dscp af21 class QoS-Bulk bandwidth remaining percent 5 random-detect dscp-based set dscp af11 class QoS-Management bandwidth remaining percent 1 set dscp cs2 class QoS-Voice-Control priority percent 5 set dscp ef class class-default fair-queue interface FastEthernet8 bandwidth 1024 bandwidth receive 20480 ip address dhcp ip nat outside ip virtual-reassembly duplex auto speed auto auto discovery qos crypto map mymap max-reserved-bandwidth 80 service-policy output QoS-Priority-Output crypto map mymap 10 ipsec-isakmp set peer 1.2.3.4 default set transform-set ESP-3DES-SHA match address 110 qos pre-classify ! fa8 is my connection to the internet. Voice traffic goes over a VPN ("mymap") to the SIP server. That's why I specified "qos pre-classify" which I believe is the way to classify traffic over the VPN. However even when I ping a public IP while saturating upload bandwidth, the latency is exceptionally high. Is this configuration correct? Are there any suggestions that might make this work for my setup? Thanks in advance.

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