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• Odd Series of Packets, How would I reproduce this behavior?

  - by JustSmith

  I recorded a series of http packets that I cant programmatically recreate. The series of packets goes like this: HTTP GET /axis-cgi/admin/param.cgi?action=list&group=Network.eth0.MACAddress,Properties.System.SerialNumber,DVTelTest,SightLogix.ProdShortName HTTP/1.1 HTTP HTTP/1.1 200 OK (text/plain) HTTP GET /axis-cgi/admin/param.cgi?action=list&group=Properties.Image.Resolution HTTP/1.1 HTTP HTTP/1.1 200 OK (text/plain) HTTP GET /axis-cgi/admin/param.cgi?action=update&Network.RTSP.ProtViewer=password HTTP/1.1 HTTP GET /axis-cgi/admin/param.cgi?action=list&group=Event HTTP/1.1 HTTP HTTP/1.1 200 OK (text/plain) HTTP GET /axis-cgi/admin/param.cgi?action=list&group=ImageSource.I0.Sensor HTTP/1.1 HTTP HTTP/1.1 200 OK (text/plain) Notice the two GET followed by one response. I though the two gets were going out at the same time but there is no corresponding number of responses. Also when trying to reproduce this pattern as the server if I abort the first GET request the client waits until it times out and starts the request over with out sending any other requests. What is happening here? How can I reproduce it?

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• Is frameworks really necessary for this problem?

  - by The Elite Gentleman

  Hi Guys I'm creating an online music store application (in Java) for signed and unsigned artist for my client. I'm currently using Struts 1.3.10 (I was recommended Spring but Spring setup is sort of similar to Struts) for my Web application. My Database is currently a MySQL 5 (or higher) and I'm using a DAO pattern to talk to it. There are limitations to using Struts and DAO's (e.g. Multiple File upload in Struts is not implemented the same way as multiple String parameters, and for DAO's, there lacks a Publish-Subscribe feature). Is what I'm doing the best way forward or should I go straight Hibernate (or similar) and move out of Struts? What are the performance implications or technical issues that you've experienced with the same setup I have? The client doesn't care how I do it as long as it is done.

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• Design from scratch - building classes

  - by Tony

  Hi All, I've started a new project where I'm writing a WPF business application, but I'm having trouble with the design. The database was easy to put together, but I'm not sure how I have to go about the designing the application itself. The main thing that I find hard is the code design. I've decided that the MVVM pattern is very applicable for this application, but how do I go about deciding what classes to build and how things go from there? Does anyone have some guidelines I could use? This is a standard business application that just stores and retrieves data. Some data queries will also need to be performed.

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• DTO and mapper generation from Domain Objects

  - by Nicolas

  I have plenty of java domain objects that I need to transform to DTOs. Please, don't start with the anti-pattern thing, the Domain Objects are what they are because of a long history, and I can't modify them (or not too much, see below). So, of course, we've passed the age of doing all that manually. I've looked around, and dozer seems the framework of choice for DTO mapping. But... what I'd really like is this: annotate classes and fields that I want in DTO, and run a tool that would generate the DTOs and the mappers. Does that sound too unreasonable? Does such a tool already exist?

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• returning a memoryStream as a string

  - by WeNeedAnswers

  What is wrong with this statement? return new ASCIIEncoding().GetString(memoryStream.ToArray()); I know about the Dispose pattern, have checked out the underlying memoryStream and seen that there is nothing really happening in the dispose. So why shouldn't I allow one of my developers to do this. The aim is to make the code succinct and not create references that are not required, Hopefully getting the Garbage Collector to kick in soon as. Its just niggling me, I feel that the memoryStream lets the party down, when compared to what the other streams do and why they implement the IDispose. Can someone please give me a good reason not to allow the code above. I got a gut feeing about the code not being right but need some back up. :)

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• How do I run a vim script that alters the current buffer?

  - by Dan

  I'm trying to write a beautify.vim script that makes C-like code adhere to a standard that I can easily read. My file contains only substitution commands that all begin with %s/... However, when I try to run the script with my file open, in the manner :source beautify.vim, or :runtime beautify.vim, it runs but all the substitute commands state that their pattern wasn't found (patterns were tested by entering them manually and should work). Is there some way to make vim run the commands in the context of the current buffer? beautify.vim: " add spaces before open braces sil! :%s/\%>1c>\s\@<!{/ {/g " beautify for sil! :%s/for *( *\([^;]*\) *; *\([^;]*\) *; *\([^;]*\) *)/for (\1; \2; \3)/ " add spaces after commas sil! :%s/,\s\@!/, /g In my tests the first :s command should match (it matches when applied manually).

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• TextBox.TextChanged & ICommandSource

  - by Brad Leach

  I am following the M-V-VM pattern for my WPF UI. I would like to hook up a command to the TextChanged event of a TextBox to a command that is in my ViewModel class. The only way I can conceive of completing this task is to inherit from the TextBox control, and implement ICommandSource. I can then instruct the command to be fired from the TextChanged event. This seems to be too much work for something which appears to be so simple. Is there an easier way (than subclassing the TextBox and implementing ICommandSource) to hook up the TextChanged event to my ViewModel class?

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• Creating an SQL Compact file: Template or script?

  - by David Veeneman

  I am writing an application that writes to SQL Compact files that have a specific schema, and I am now implementing the New File use case. The simplest approach seems to be to use a Template pattern: first, create a template file that lives in the application directory. Then, when the user selects New File, the template is copied to the name and destination specified by the user in a New File dialog. The alternative is a scripted approach: Use the same New File dialog, but dispense with the template file. Instead, create an empty SQL Compact file using the name/destination specified by the user, and then execute a T-SQL script on it from managed code. At this point, I am leaning toward the Template approach, because it is simpler. Is there any reason I should not use that approach? Thanks for your help.

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• How do I format positional argument help using Python's optparse?

  - by cdleary

  As mentioned in the docs the optparse.OptionParser uses an IndentedHelpFormatter to output the formatted option help, for which which I found some API documentation. I want to display a similarly formatted help text for the required, positional arguments in the usage text. Is there an adapter or a simple usage pattern that can be used for similar positional argument formatting? Clarification Preferably only using the stdlib. Optparse does great except for this one formatting nuance, which I feel like we should be able to fix without importing whole other packages. :-)

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• How to compile runnable jar from packages?

  - by sacamano

  Hey. My java application has got a package structure similar to this; src/com/name/app , src/com/name/app/do , src/com/name/utils/db and so on. How would I go about compiling java files in these directories in to a runnable jar? I need to package required libraries into the generated JAR (jdbc). I've always done these things in Eclipse but now I need to supply a couple of people with a way to compile the repository without the use of eclipse and I was thinking of making a makefile or a script that invokes the necessary javac pattern. Any help is greatly appreciated.

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• lock file so that it cannot be deleted

  - by JoeCool

  I'm working with two independent c/c++ applications on Windows where one of them constantly updates an image on disk (from a webcam) and the other reads that image for processing. This works fine and dandy 99.99% of the time, but every once in a while the reader app is in the middle of reading the image when the writer deletes it to refresh it with a new one. The obvious solution to me seems to be to have the reader put some sort of a lock on the file so that the writer can see that it can't delete it and thus spin-lock on it until it can delete and update. Is there anyway to do this? Or is there another simple design pattern I can use to get the same sort of constant image refreshing between two programs? Thanks, -Robert

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• Remove whitespace and line breaks between HTML elements using jQuery

  - by mager

  Using jQuery, I'd like to remove the whitespace and line breaks between HTML tags. var widgetHTML = ' <div id="widget"> <h2>Widget</h2><p>Hi.</p> </div>'; Should be: alert(widgetHTML); // <div id="widget"><h2>Widget</h2><p>Hi.</p></div> I think the pattern I will need is: >[\s]*< Can this be accomplished without using regex?

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• How can the javascript plugin architecture in raphael/jquery be done?

  - by TimDog

  I'm looking for a barebones javascript example that demonstrates how the javascript plugin architecture works with large javascript libraries (such as raphael or jquery). In either scenario, you build plugins by ensuring your custom plugin follows this pattern: jQuery.fn.pluginName -- so assume I have a library: myLibrary = (function() { //my fancy javascript code return function() { //my return object }; }); How would fn be incorporated into the above myLibrary object to ensure that he resulting plugin is callable? I instantiate myLibrary like so: var lib = new myLibrary(); And now I have included a reference to my plugin in my page: myLibrary.fn.simplePlugin = function() { //more fancy code } So finally, I can just call: lib.simplePlugin(); Basically, what magic is actually occuring when the .fn is used during the creation of the plugin?

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• Ant 1.8 include or import with nested resource collection

  - by Danny

  I'd like to have Ant automatically include or import resources matching a particular pattern, but I'm really struggling with the syntax. Here's what I've tried: <import> <fileset dir="${basedir}" includes="*-graph.xml" /> </import> However, I just get the error message import requires file attribute or at least one nested resource The documentation for import (and include) both say that you can use a nested resource collection, and the documentation for resource collections says <fileset> is a resource collection. I've Googled and can't find any useful examples at all. I'm using Ant 1.8.1 (verified with ant -version)

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• Nesting Patterns Algorithms / Cutting Waste Problem

  - by WedTM

  First off, I'd like to say that I'm already looking into the "Cutting Stock Problem" algorithm, however I feel that I need a bit more clarification, and possibly some help with some of the math (Not my strong point). What I need to do is have an offset pattern that causes the circle to fit in the crevasse created by having the two circular dies sitting next to each other on the previous line, like so: O O O O O O O O O O O O O O O O O I'm hoping someone can point me towards the right algorithm for this! Thanks!

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• Another Java vs. Scala perspective - is this typical?

  - by Alex R

  I have been reading about Scala for a while and even wrote some small programs to better understand some of the more exoteric features. Today I decided to do my first "real project", translating some 60 lines of ugly Java code to Scala to rewrite it using the better pattern-matching features (why? because the Java version was becoming hard to maintain due to excessive combination of regex and conditionals). About halfway through the editing process, Eclipse thew up this error: I get the general impression that the Scala IDE in Eclipse is a lot buggier and less complete than its Java equivalent. Is this correct or do I just have a bad installation? Is there a better IDE for Scala?

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• Scala match question

  - by javier

  Hello to everyone. I came across with an error on my Scala code that I cannot solve by myself (I am new at Scala). I have the following code: def myFunction(list: List[Any]): String = { var strItems : String = ""; list.foreach(item => { strItems += item match { case x:JsonSerializable => x.toJson() case y:String => ("\"" + y + "\"") case _ => item.toString } if(item != list.last) strItems += ","; }) strItems; } The error I am getting is: error: pattern type is incompatible with expected type; found : String required: Unit case y:String = ("\"" + y + "\"") Any idea why? PS: is there a more performant way to code myFunction

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• Binding command to button in silverlight 4 using mvvm

  - by Archie

  Hello, I have a user control called HomePage.xaml. I'm creating a model instance (using MVVM pattern) in the code behind file in the constructor of page as MainViewModel model = new MainViewModel(); I have a button in HomePage.xaml which I want to bind to the command inside MainViewModel called GetData() and want to populate the data in datagrid. MainViewModel has an ObservableCollection which I would use to bind the data in datagrid. Populating the data in datagrid without binding command works fine. I'm binding the button as: <StackPanel x:Name="stkPanelInput" Orientation="Horizontal" VerticalAlignment="Center" HorizontalAlignment="Center"> <Button x:Name="buttonGetData" Width="70" Content="GetData" Command="{Binding GetData}" Click="buttonGetData_Click"/> </StackPanel> How shall I bind the command using MVVM? Thanks.

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• Iphone -- init method of an abstract class

  - by William Jockusch

  I want to create classes Car, Vehicle, and Airplane with the following properties: Car and Airplane are both subclasses of Vehicle. Car and Airplane both have an initWithString method. The acceptable input strings for Car's and Airplane's initWithString methods do not overlap. Vehicle is "almost abstract", in the sense that any initialized instance should be either a Car or an Airplane. It is possible to pass a string into Vehicle and get back an instance of Car, an instance of Airplane, or nil, depending on the input string. Any particular design pattern I should prefer? In particular for Vehicle's initWithString and/or newVehicleWithString methods.

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• Presenting MVC to Old C++ Spaghetti Coders?

  - by leeand00

  I wish to present the idea of MVC to a bunch of old C++ spaghetti coders (at my local computer club). One of them that has alot of influence on the rest of the group seems to finally be getting the idea of encapsulation (largely due in part to this website). I was hoping that I could also point him in the right direction by showing him Model View Controller, but I need to do it in a way that makes sense to him, as well as it probably needs to be written in C/C++! I realize that MVC is a very old architectural pattern so it would seem to me that there should be something out there that would do the job. I'm more of a web developer, so I was wondering if anybody out there who is a good C/C++ coder could tell me what it is that made the MVC light switch turn on in your head.

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• Limit the model data fields serialized by Web API based on the return type Interface

  - by Stevo3000

  We're updating our architecture to use a single object model for desktop, web and mobile that can be used in the MVVM pattern. I would like to be able to limit the data fields that are serialized through Web API by using interfaces on the controllers. This is required because the model objects for mobile are stored in HTML5 local storage so don't carry optional data while a thin desktop client would be able to store (and work with) more data. To achieve this a model will implement the different interfaces that define which data fields should be serialized and there will be a controller specific to the interface. The problem is that the Web API always serializes every field in the model even if it is not part of the interface being returned. How can we only serialize fields in the returned interface?

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• UISplitViewController: how to get toolbar if details controller is UITableView?

  - by Krumelur

  Hi, I checked out Apple's example on how to exchange detail views in the UISplitViewController (http://developer.apple.com/library/ios/#samplecode/MultipleDetailViews/Introduction/Intro.html#//apple_ref/doc/uid/DTS40009775) and it seems that they put the UIToolbar in every detail controller. Then, if the device is rotated, they hide the toolbar or show it and add a popover button which will show the root controller. I'd like to adopt this pattern to show my root controller in a popover using a button in the toolbar, but unfortunately, my detail controllers are all UITableViewControllers and they do not allow adding other UI elements than a table view. So how do I deal with that? Is there an example around? René

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• How to study programming with C language

  - by gurugio

  I am using only C for 5 years. So I am sure that I know C grammer, but I have no idea how to advance programming skills. There are many books for modern languages (such as C++, Java) to study programming skills like the refactoring or pattern, software architecture. But no book is written with C language. The book author say that his/her book is not language-dependent, but I don't think so. How can I advance my programming skills? I have to study modern language and read the books? Are there books about software design or programming skill written with C?

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• Does the WCF framework support the XSD IDREF restriction?

  - by Gerard

  A nice feature in XSD is the IDREF restriction, e.g.: <xs:restriction base="xs:IDREF"> <xs:pattern value="[0-9a-zA-Z\-]+"/> </xs:restriction> I used this restriction with great benefit in a Java JAXWS-project. An object serialized in a SOAP XML datamodel can hold a reference (pointer) to another object in the same SOAP message. I want to try the same approach in a C# WCF-project, can it be done? On the web site Data Contract Schema Reference I can see e.g. Id ignored, Ref forbidden, but I am not sure whether I understand what that means.

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• First time unit testing (in silverlight)

  - by Jakob

  Hi I've searched some other posts, but most of them assumed that people knew what they were doing in their unit testing, and frankly I don't. I see the idea behind unit testing, and I'm coding an silverlight application much in the blind right now, and I'd like to write some unit tests to kind of be sure I'm on the right path. I'd like to be able to use the SL4 vs 2010 silverlight unit test project template, to keep it simple and not use external tools. So what I need an answer for are questions like: what are the methods of unit testing? what are the differences between unit tests, and automated unit tests? How do I meaningfully unit test in silverlight? What should I be aware of while unit testing (in silverlight) ? Also should I implement some kind of IRepository pattern in my silverlight app to make unit testing easier?

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