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• How do you balance business process changes against the challenges of changing software?

  - by Achilles

  In my admittedly young career I've found myself writing code to support quirky business rules and processes. Inevitably these changes were always in some massively difficult code base and caused many issues. My question has a couple of parts: While software is a tool for businesses to make their lives easier, at what point do we as developers suggest a change in business process rather than in the software as the "magic bullet" to solve a particular problem. How do we as developers evangelize a certain level of reverence for the software as well as the difficulty involved in making changes simply to support the quirks of the business? I understand that these changes in business processes promote our industry, but in an analogy my father would understand: Which is easier, to melt down a hammer to forge a screwdriver to drive screws or to simply use nails since your hammer is already awesome...?

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• sOperator as and generic classes

  - by abatishchev

  I'm writing .NET On-the-Fly compiler for CLR scripting and want execution method make generic acceptable: object Execute() { return type.InvokeMember(..); } T Execute<T>() { return Execute() as T; /* doesn't work: The type parameter 'T' cannot be used with the 'as' operator because it does not have a class type constraint nor a 'class' constraint */ // also neither typeof(T) not T.GetType(), so on are possible return (T) Execute(); // ok } But I think operator as will be very useful: if result type isn't T method will return null, instead of an exception! Is it possible to do?

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• Spring online repository for Maven

  - by Fortyrunner

  I've just installed Maven2 for the first time. By default it pulls down a few useful jars into a local project: jakarta-commons, junit etc. I wanted to pull in the latest Spring release (2.5.6 at the time of writing). But the online repositories I looked at (iBiblio and Maven) only had much older versions of Spring libraries. Are there any other repositories that are kept up to date? What is the best practice here; can we maintain them ourselves? I would be prepared to help out maintaining this stuff!

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• Information Label

  - by caisenm

  I am trying to make an information label that should display the events the application doing. deleting data, reading data, writing data, connection to db. etc.. I've added a label to my form and I am changing its text property for each operation like: label1.Text = "stored procedure is being executed.."; But, in the run time the text of the label does not change. I've tried to add the method Application.DoEvents(); to every place I've changed the label's text property. It works fine. But it looks silly. So I've tried to add this method to my label's "TextChanged" event. But it does not work! Am I doing something wrong? Or, is there any efficient way to make an information label?

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• Piping SoX in Python - subprocess alternative?

  - by Cochise Ruhulessin

  I use SoX in an application. The application uses it to apply various operations on audiofiles, such as trimming. This works fine: from subprocess import Popen, PIPE kwargs = {'stdin': PIPE, 'stdout': PIPE, 'stderr': PIPE} pipe = Popen(['sox','-t','mp3','-', 'test.mp3','trim','0','15'], **kwargs) output, errors = pipe.communicate(input=open('test.mp3','rb').read()) if errors: raise RuntimeError(errors) This will cause problems on large files hower, since read() loads the complete file to memory; which is slow and may cause the pipes' buffer to overflow. A workaround exists: from subprocess import Popen, PIPE import tempfile import uuid import shutil import os kwargs = {'stdin': PIPE, 'stdout': PIPE, 'stderr': PIPE} tmp = os.path.join(tempfile.gettempdir(), uuid.uuid1().hex + '.mp3') pipe = Popen(['sox','test.mp3', tmp,'trim','0','15'], **kwargs) output, errors = pipe.communicate() if errors: raise RuntimeError(errors) shutil.copy2(tmp, 'test.mp3') os.remove(tmp) So the question stands as follows: Are there any alternatives to this approach, aside from writing a Python extension to the Sox C API?

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• How to rewrite the URL

  - by Kalpana

  I have a small application built using Seam 2.2, Richfaces 3.3, JBoss 5.1. Most of the page navigation adds the request parameters to the target URL. I would like to hide parameters to be hidden to the customer who is using the application (e.g. I would expect the URL to be something like "http://localhost:8080/books/Book.seam". The parameters (userId, orderId and cmId) are currently mapped to the backend bean via Book.page.xml. How do I prevent the request parameters from showing up in the browser URL, as it also allows the customer to manipulate the URL. We did look at seam URL re-writing feature, it talked about manipulating say the primary key id in a REST format, not sure how to accomplish something more complex like the above use case in a elegant fashion.

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• Google Chrome + Ajax

  - by teehoo

  Im writing an ajax web app that uses Comet/Long Polling to keep the webpage up to date, and I noticed in Chrome, it treats the page as if its always loading (icon for the tab keeps spinning). I thought this was normal for Google Chrome + Ajax because even Google Wave had this behaviour. Well today I noticed that Google Wave no longer keeps the loading icon spinning, anyone know how they fixed this? Here's my ajax call code var xmlHttpReq = false; // Mozilla/Safari if (window.XMLHttpRequest) { xmlHttpReq = new XMLHttpRequest(); } // IE else if (window.ActiveXObject) { xmlHttpReq = new ActiveXObject("Microsoft.XMLHTTP"); } xmlHttpReq.open('GET', myURL, true); xmlHttpReq.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded'); xmlHttpReq.onreadystatechange = function() { if (xmlHttpReq.readyState == 4) { updatePage(xmlHttpReq.responseText); } } xmlHttpReq.send(null);

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• Functionality in a Data Access Layer formed by a dbml

  - by Younes

  I got a Data Access Layer that's being formed by one DBML in which i just include all object I need. Is it necessary to write more functionality in this dbml or can I just use the dbml as my DAL? I ask this because I am currently writing functionality to, for example, get all Articles from a Table in the Business Logic Layer. So I'm kind of lost now. What kind of examples can be given so that it's clear to me what to put in the Business Layer.

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• Recommendation for serial communications in Access 2007

  - by bglenn

  I need to communicate with a bar code scanner connected over a serial port in Microsoft Access. In older versions of Access I was able to use a wrapper around MSCOMM32.ocx that no longer seems to work. I can't use wedge communication because I need to use ACK/NACK which is only supported through the RS232 interface and I need to send messages to the scanner, which is also only supported through the RS232 interface. Are there any controls in widespread use that support serial communication in Access 2007? EDIT: In case anyone comes across this, the newest version of MSCOMM32.ocx (I believe dated 3/09) still works fine as of this writing. It is older versions of MSCOMM32.ocx that do not work.

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• Create an assembly in memory

  - by Jared I

  I'd like to create an assembly in memory, using an using the classes in Reflection.Emit Currently, I can create the assembly and get it's bytes using something like AssemblyBuilder builder = AppDomain.CurrentDomain.DefineDynamicAssembly(..., AssemblyBuilderAccess.Save); ... create the assembly ... builder.Save(targetFileName); using(FileStream fs = File.Open(targetFileName, FileMode.Open)) { ... read the bytes from the file stream ... } However, it does so by creating a file on the local filesystem. I don't actually need the file, just the bytes that would be in the file. Is it possible to create the assembly without writing any files?

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• CSRF error when trying to log onto Django admin page with w3m on Emacs23

  - by Vernon

  I normally use Firefox and have had no problems with the admin page on my Django website. But I use Emacs23 for writing my posts, and wanted to be able to use w3m in Emacs to copy the stuff across. When I try to log into my admin pages, it gives the CSRF error: CSRF verification failed. Request aborted. Help Reason given for failure: No CSRF or session cookie. ... Is there a way that I could get w3m to work with my admin page? I am not sure if the problem lies with the way the admin is set up on Django or with the Emacs or w3m settings.

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• expected class,delegate,enum,interface or struct

  - by Luke

  Hello, I am writing a class. I have encountered the problem in the title. Here is the code: class delivery { private string strDeliveryName; private string strDeliveryAddress; private string strDeliveryDay; private string strDeliveryTime; private string strDeliveryMeal; private string strDeliveryInstructions; private string strDeliveryStatus; } public delivery(string deliveryName, string deliveryAddress, string deliveryDay, string deliveryTime, string deliveryMeal, string deliveryInstructions, string deliveryStatus) { strDeliveryName = deliveryName; strDeliveryAddress = deliveryAddress; strDeliveryDay = deliveryDay; strDeliveryTime = deliveryTime; strDeliveryMeal = deliveryMeal; strDeliveryInstructions = deliveryInstructions; strDeliveryStatus = deliveryStatus; } I get the error on the public delivery, any idea why?

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• NSString stringWithFormat: with C array?

  - by Chris Long

  Hi, I'm writing a program that calculates the Jacobi algorithm. It's written in Objective-C since it runs on a Mac, but the majority is written in standard C. I'm using a two-dimensional C array and an NSArray containing 5 NSTextField labels. The following code yields an EXC_BAD_ACCESS error: for ( int i = 0; i < 5; i++ ) { NSString *resultString = [NSString stringWithFormat:@"%g", matrix[i][i] ]; [[resultLabels objectAtIndex:i] setStringValue:resultString]; // error line } Any help?

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• Flash FLVPlayback states

  - by rob5408

  I'm writing my own class to manage a skin for an FLVPlayback component. It works 90% of the time, but sometimes the state get really messed up. Specifically, the video is playing, meaning I can see it play and the VideoEvent.PLAYHEAD_UPDATE event is firing, but when I poll the FLVPlayback component about its playing property, it returns false. I assume this may be because 'buffering' is kind of a subset of 'playing', but I cannot confirm this in the documentation. I guess another way to ask this question is, "Does the FLVPlayback component ever buffer while it is in a stopped state?"

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• How are vector patterns used in syntax-rules?

  - by Jay

  Hi, I have been writing Common Lisp macros, so Scheme's R5Rs macros are a bit unnatural to me. I think I got the idea, except that I don't understand how one would use vector patterns in syntax-rules: (define-syntax mac (syntax-rules () ((mac #(a b c d)) (let () (display a) (newline) (display d) (newline))))) (expand '(mac #(1 2 3 4))) ;; Chicken's expand-full extension shows macroexpansion => (let746 () (display747 1) (newline748) (display747 4) (newline748)) I don't see how I'd use a macro that requires its arguments to be written as a vector: (mac #(1 2 3 4)) => 1 4 Is there some kind of technique that uses those patterns? Thank you!

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• Programmatically get screenshot of page

  - by Ender

  I'm writing a specialized crawler and parser for internal use and I require the ability to take a screenshot of a web page in order to check what colours are being used throughout. The program will take in around ten web addresses and will save them as a bitmap image, from there I plan to use LockBits in order to create a list of the five most used colours within the image. To my knowledge it's the easiest way to get the colours used within a web page but if there is an easier way to do it please chime in with your suggestions. Anyway, I was going to use this program until I saw the price tag. I'm also fairly new to C#, having only used it for a few months. Can anyone provide me with a solution to my problem of taking a screenshot of a web page in order to extract the colour scheme?

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• Extracting text from a file where date -time is the index

  - by Soham

  I have got around 800 files of maximum 55KB-100KB each where the data is in this format Date/Time/Float1/Float2/Float3/Float4/Integer Date is in DD/MM/YYYY format and Time is in the format of HH:MM Here the date ranges from say 1st May to 1June and each day, the Time varies from 09:00 to 15:30. I want to run a program so that, for each file, it extracts the data pertaining to a particular given date and writes to a file. I will not face any problem in writing into directory operations. I am trying to get around, to form a to do a search and extract operation. I dont know, how to do it, would like to have some idea. Thanks Soham

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• New to AVL tree implementation.

  - by nn

  I am writing a sliding window compression algorithm (LZ77) that searches for phrases in a "moving" dictionary. So far I have written a BST where each node is stored in an array and it's index in the array is also the value of the starting position in the window itself. I am now looking at transforming the BST to an AVL tree. I am a little confused at the sample implementations I have seen. Some only appear to store the balance factors whereas others store the height of each tree. Are there any performance advantage/disadvantages of storing the height and/or balance factor for each node? Apologies if this is a very simple question, but I'm still not visualizing how I want to restructure my BST to implement height balancing. Thanks.

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• Implementing a Suspension or Penalty System for Users in ASP.NET MVC

  - by Maxim Z.

  I'm writing a site in ASP.NET MVC that will have user accounts. As the site will be oriented towards discussion, I think I need a system for admins to be able to moderate users, just like we have here, on Stack Overflow. I'd like to be able to put a user into a "suspension", so that they are able to log in to the site (at which point they are greeted with a message, such as, "Your account has been suspended until [DATE]"), but are unable to do the functions that users they would normally be able to do. What's the best way of implementing this? I was thinking of creating a "Suspended" role, but the thing is, I have a few different roles for normal users themselves, with different privileges. Have you ever designed a feature like this before? How should I do it? Thanks in advance.

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• Recursive FTP directory listing in shell/bash with a single session (using cURL or ftp)

  - by Timo

  I am writing a little shellscript that needs to go through all folders and files on an ftp server (recursively). So far everything works fine using cURL - but it's pretty slow, becuase cURL starts a new session for every command. So for 500 directories, cURL preforms 500 logins. Does anybody know, whether I can stay logged in using cURL (this would be my favourite solution) or how I can use ftp with only one session in a shell script? I know how to execute a set of ftp commands and retrieve the response, but for the recursive listing, it has to be a little more dynamic... Thanks for your help!

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• segfault during fclose()

  - by Hristo

  fclose() is causing a segfault. I have : char buffer[L_tmpnam]; char *pipeName = tmpnam(buffer); FILE *pipeFD = fopen(pipeName, "w"); // open for writing ... ... ... fclose(pipeFD); I don't do any file related stuff in the ... yet so that doesn't affect it. However, my MAIN process communicates with another process through shared memory where pipeName is stored; the other process fopen's this pipe for reading to communicated with MAIN. Any ideas why this is causing a segfault? Thanks, Hristo

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• Counting the number of characters in a file

  - by Kat

  I'm writing a program that for one part asks for the program to print how many characters (including whitespaces) are in a file. The code I have right now though returns 0 every time though and I'm not sure why it isn't counting the characters. public int getcharCount(Scanner textFile) { int count = 0; while(textFile.hasNext()) { String line = textFile.nextLine(); for(int i=0; i < line.length(); i++) count++; } return count; }

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• Connecting to multiple firebird Databases via Delphi

  - by Branden

  I am integrating a system with 2 other applications, 1 using a Firebird database whilst the other BIS (using ADO). My delphi application uses Firebird. I need to read data from my database, insert it into both the BIS database and the other application firebird database. I have created seperate data modules for each. Sending data to the ADO works fine, but when writing to the other Firebird DB (my db still open) I get strange errors. I have managed to isolate the problem to the second firebird DB. Small data writes seems fine. The data structures are completly different, so un able to use a synch tool. is there a way to overcome this by using multi threading or seperate memory space each Firebird instance uses?

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• What is the equivalent to Java's canvas object in C#?

  - by Winston

  I'm working on creating a basic application that will let a user draw (using a series of points) and I plan to do something with these points. If this were Java, I think I would probably use a canvas object and some Java2D calls to draw what I want. All the tutorials I've read on C#/Drawing involve writing your own paint method and adding it to the paint event for the form. However, I'm interested in having some traditional Form controls as well and I don't want to be drawing over them. So, is there a "Canvas" object where I can constrain what I'm drawing on? Also, is WinForms a poor choice given this use case? Would WPF have more features that would help enable me to do what I want? Or Silverlight?

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• Entity Framework v4 examples and tutorials of conceptual model mapping

  - by Rody van Sambeek

  In an application I'm writing I have a fairly complicated Database model. I'd like to use EF4 to map this to a whole lot nicer conceptual model. However all the tutorials I've read are with samples of 2 or 3 tables which all map 1 on 1 to the conceptual model. I'd like to learn how to correctly map the database model to a different conceptual model using VS 2010. However I can't find any good tutorials or (preferabally) instruction video's. Somebody got any tips, links or even books?

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