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• ADO.net, Check if ObjectContext is writeable

  - by user287107

  I have an embedded database in an asp.net mvc project. If I try to write to the file, I sometimes get a write failed exception because the SQL Server can't write to the file. How can I check an ObjectContext, if its writeable, without actually writing something to the database?

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• How do I extract data from a FoxPro memo field using .NET?

  - by Madhu kiran

  Hi, I'm writing a C# program to get FoxPro database into datatable everything works except the memo field is blank or some strange character. I'm using C# .Net 2.0. I tried the code posted by Jonathan Demarks dated Jan 12. I am able to get the index but i don't know how to use this index to fetch the data from memo file. Pleaese help me. Thanks Madhu

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• Qt Sockets and Endianness

  - by cake

  Hello I'm writing a program that uses QUdpSocket for transmiting data over the network. This is my first socket program, and I've come across an interesting problem called Endianness. My actual question in, do I have to worry about Endianness when I'm using QNetwork as my sockets library? If I do have to worry, what do I have to do to properly avoid Endianness problems? Thanks in advance.

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• Is there a more easy way to create a WCF/OData Data Service Query Provider?

  - by routeNpingme

  I have a simple little data model resembling the following: InventoryContext { IEnumerable<Computer> GetComputers() IEnumerable<Printer> GetPrinters() } Computer { public string ComputerName { get; set; } public string Location { get; set; } } Printer { public string PrinterName { get; set; } public string Location { get; set; } } The results come from a non-SQL source, so this data does not come from Entity Framework connected up to a database. Now I want to expose the data through a WCF OData service. The only way I've found to do that thus far is creating my own Data Service Query Provider, per this blog tutorial: http://blogs.msdn.com/alexj/archive/2010/01/04/creating-a-data-service-provider-part-1-intro.aspx ... which is great, but seems like a pretty involved undertaking. The code for the provider would be 4 times longer than my whole data model to generate all of the resource sets and property definitions. Is there something like a generic provider in between Entity Framework and writing your own data source from zero? Maybe some way to build an object data source or something, so that the magical WCF unicorns can pick up my data and ride off into the sunset without having to explicitly code the provider?

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• What are the most commonly used anti-patterns?

  - by Esteban Araya

  I'm just wondering what are some of the classic mistakes we all make. I think before working on writing good code, you must learn to recognize bad code... especially when it's YOUR code!

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• Call task more than once in Rails 3 generator

  - by balexand

  I'm writing a Rails 3 generator that creates two different models. Here's a very simplified example of what I'm trying to do: def my_generator_task invoke "model", ["foo"] invoke "model", ["bar"] end The problem is that the Thor invoke method only invokes a task once, so the second call to the "model" task never happens and the "bar" model is never created. Does anyone know an elegant way to accomplish this, preferably in a way that doesn't break the ability to run "rails destroy" with the generator?

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• Objective C Default parameters?

  - by Brian Postow

  I'm writing a C function in Objective C. I want a default value for my last parameter. I've tried: foo(int a, int b, int c = 0); but that's C++ I've also tried foo(int a, int b, int c) { ... } foo(int a, int b) { foo(a, b, 0); } But that's ALSO C++. is there a way to do this in Objective C?

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• C# integer primary key generation using Entity Framework with local database file (Sdf)

  - by Ronny

  Hello, I'm writing a standalone application and I thought using Entity Framework to store my data. At the moment the application is small so I can use a local database file to get started. The thing is that the local database file doesn't have the ability to auto generate integer primary keys as SQL Server does. Any suggestions how to manage primary keys for entities in a local database file that will be compatible with SQL Server in the future? Thanks, Ronny

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• Any suggestions for testing extjs code in a browser, preferably with selenium?

  - by mm2001

  We've been using selenium with great success to handle high-level website testing (in addition to extensive python doctests at a module level). However now we're using extjs for a lot of pages and its proving difficult to incorporate Selenium tests for the complex components like grids. Has anyone had success writing automated tests for extjs-based web pages? Lots of googling finds people with similar problems, but few answers. Thanks!

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• RESTful API design question - how should one allow users to create new resource instances?

  - by Tamás

  I'm working in a research group where we intend to publish implementations of some of the algorithms we develop on the web via a RESTful API. Most of these algorithms work on small to medium size datasets, and in many cases, a user of our services might want to run multiple queries (with different parameters) on the same dataset, so for me it seems reasonable to allow users to upload their datasets in advance and refer to them in their queries later. In this sense, a dataset could be a resource in my API, and an algorithm could be another. My question is: how should I let the users upload their own datasets? I cannot simply let users upload their data to /dataset/dataset_id as letting the users invent their own dataset_ids might result in ID collision and users overwriting each other's datasets by accident. (I believe one of the most frequently used dataset ID would be test). I think an ideal way would be to have a dedicated URL (like /dataset/upload) where users can POST their datasets and the response would contain a unique ID under which the dataset was stored, but I'm not sure that it does not violate the basic principles of REST. What is the preferred way of dealing with such scenarios?

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• SNMP Broadcast on Windows

  - by SNMP Dev

  I'm writing an SNMP agent in windows. The agent responds fine simple get and get-next request sent directly to computer's ip address. But when I do a SNMP broadcast, the computer receives the packet but does not anwer that. Why is that? The firewall is off and the antivirus too.

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• Any Open Source Pregel like framework for distributed processing of large Graphs?

  - by Akshay Bhat

  Google has described a novel framework for distributed processing on Massive Graphs. http://portal.acm.org/citation.cfm?id=1582716.1582723 I wanted to know if similar to Hadoop (Map-Reduce) are there any open source implementations of this framework? I am actually in process of writing a Pseudo distributed one using python and multiprocessing module and thus wanted to know if someone else has also tried implementing it. Since public information about this framework is extremely scarce. (A link above and a blog post at Google Research)

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• How to extract data from a PDF?

  - by Fermin

  Hi, My company receives data from an external company via Excel. We export this into SQL Server to run reports on the data. They are now changing to PDF format, is there a way to reliably port the data from the PDF and insert it into our SQL Server 2008 database? Would this require writing an app or is there an automated way of doing this?

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• Best open source Mixed Integer Optimization Solver

  - by Mark

  I am using CPLEX for solving huge optimization models (more than 100k variables) now I'd like to see if I can find an open source alternative, I solve mixed integer problems (MILP) and CPLEX works great but it is very expensive if we want to scale so I really need to find an alternative or start writing our own ad-hoc optimization library (which will be painful) Any suggestion/insight would be much appreciated

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• Simple html vs Javascript generated html?

  - by Rizo

  In my web application I would like to complately avoid html and use only javascript to create web-page's dom tree. What is faster writing web content in the traditional way in html <div>Some text</div> or using javascript dom render, like this: div.appendChild(document.createTextNode("Some text"));?

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• Bypassing validation with machinist

  - by toofancy

  Hi, I am writing my specs on my model Thing which has a date field which should be after the date of creation, thus I use the *validate_timeliness* plugin like that validate_date :date, :after Time.now I want to be able to add some Things with an anterior date but validation fails. I want to bypass the validation when creating some Things with the machinist factory. Any clue ?

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• Method name collision in interface implementation - Java

  - by Bhaskar

  If I have two interfaces , both quite different in their purposes , but with same method signature , how do I make a class implement both without being forced to write a single method that serves for the both the interfaces and writing some convoluted logic in the method implementation that checks for which type of object the call is being made and invoke proper code ? In C# , this is overcome by what is called as explicit interface implementation. Is there any equivalent way in Java ?

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• How to add data from an NSTextField to a Core Data Attribute without having to press Return or Tab a

  - by roy-fleming

  I use a sheet with 3 NSTextFields and a Cancel- and OK-Button to edit the attributes of a Core Data Entity. The text entered in the NSTextFields is only updated in the Core Data Entity if i press Tab or Return after writing in the NSTextField or if i focus another NSTextField with the mouse. If i just enter text in an NSTextField and press the OK-Button the entered text is lost. Is there some attribute i can set in Interface Builder to change this NSTextField behaviour?

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• Does changing window.location stop execution of javascript?

  - by Aleksander Kmetec

  When writing server-side code you need to explicitly stop execution after sending a "Location: ..." header to the client or your code will continue to execute in the background. But what about when you change window.location in a client-side script? Does this immediately stop execution of the current script or is it up to the programmer to make sure that any code located after this call is not reached?

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• Comprehensive and well maintained wiki syntax Parser for PHP

  - by Rowan

  I'm looking for a comprehensive and well maintained wiki syntax Parser for PHP, does anybody know of one? I can find some really good parsers for markdown and bbcode but am having trouble with finding a decent wiki parser. I prefer markdown myself, but I'm writing post functions for a CMS and I'd like to give end-users a choice. I thought about downloading a copy of MediaWiki and seeing how they do it, thoughts on this as an option?

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• Easily read and write XML using C#

  - by NewDev

  I have already found something for reading XML, however I find it difficult to write and update XML. Can anybody please help in giving some code or advice on the best way of writing to XML files?

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• How can you tell if a trigger is enabled in SQL Server 2000

  - by Mark Brady

  This shouldn't be hard to do. I'd expect Enterprise Manager to show a folder of trigger and a list and an icon... but I don't see it anywhere. My google results get me answers where I have to write code. Are you kidding me? The only way is by writing code?

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• How to import data to SAP

  - by Mehmet AVSAR

  Hi, As a complete stranger in town of SAP, I want to transfer my own application's (mobile salesforce automation) data to SAP. My application has records of customers, stocks, inventory, invoices (and waybills), cheques, payments, collections, stock transfer data etc. I have an additional database which holds matchings of records. ie. A customer with ID 345 in my application has key 120-035-0223 in SAP. Every record, for sure, has to know it's counterpart, including parameters. After searching Google and SAP help site for a day, I covered that it's going to be a bit more pain than I expected. Especially SAP site does not give even a clue on it. Say I couldn't find. We transferred our data to some other ERP systems, some of which wanted XML files, some other exposed their APIs. My point is, is Sql Server's SSIS an option for me? I hope it is, so I can fight on my own territory. Since client requests would vary a lot, I count flexibility as most important criteria. Also, I want to transfer as much data as I could. Any help is appreciated. Regards,

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• CSS compilers and converting IE hacks to conditional css

  - by xckpd7

  Skip to bottom for question, but first, a little context. So I have been looking into CSS compilers (like Sass & Less) for a while, and have been really interested in them, not because they help me understand anything easier (I've been doing css for a couple of years now) but rather they cut down on cruft and help me see things easier. I recently have been looking into reliably implementing inline-block (and clearfix), which require lots of extraneous code & hacks. Now according to all the authorities in the field, I shouldn't put IE hacks in the same page I do my CSS in, I should make them conditional. But for me that is a really big hassle to go through and manage all this additional code, which is why I really like things like Less. Instead of applying unsemantic classes, you specify a mixin and apply it once, and you're all set. So I guess I got a little of the track (I wanted to explain my points) but bascially, I'm at the point where these CSS compilers are very useful for me, and allow me to abstract a lot of the cruft away, and reliably apply them once and then just compile it. I would like to have a way to be able to compile IE specific styles into their own conditional files (ala Less / Sass) so I don't have to deal with managing 2 files for no reason. Does anything like a script/applcation that runs and can make underscore / star hacks apart of their own file exist?

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• Excel Macro to create sheets

  - by Harish

  I have a Excel sheet with two columns and I need to create new sheets based on the values of the first column.ie A B test1 Value21 test1 Values22 test2 Value21 test2 Value32 test3 Values32 IN this case I need to create three sheets namely test1,test2 and test3 Sheet 1 should contain test1 field and its corresponding values.Similarly sheet 2 and 3 should contain corresponding values. Can anyone help me in writing an Excel Macro for this

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