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• Disable cache in Silverlight HttpWebRequest

  - by synergetic

  My Silverlight4 app is hosted in ASP.NET MVC 2 web application. I do web request through HttpWebRequest class but it gives back a result previously cached. How to disable this caching behavior? There are some links which talks about HttpWebRequest in .NET but Silverlight HttpWebrequest is different. Someone suggested to add unique dummy query string on every web request, but I'd prefer more elegant solution. I also tried the following, but it didn't work: _myHttpWebRequest.BeginGetRequestStream(new AsyncCallback(BeginRequest), new Guid()); In fact, by setting browser history settings it is possible to disable caching. See the following link: http://stackoverflow.com/questions/3027145/asp-net-mvc-with-sql-server-backend-returns-old-data-when-query-is-executed But asking a user to change browser settings is not an option for me.

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• IM (Instant Messaging) increase or decrease developer's productivity?

  - by GRGodoi

  In my team I have some developers that always have two or three IM windows open. The majority of these windows are not related with the project where they are nor with asking or offering programming help. I also use IM and, off course, some of my "talks" are not related with the job. But I feel that when I am using IM my productivity drops. I mean, there is more "mental" work to change the scope between the task I am doing and the conversation every time a new message arrive. Do you face the same situation? Is there some good practices to avoid this (excluding, off course, stopping using IM)?

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• Embed VLC player in GWT

  - by chrisnfoneur

  Hello, I want to embed a VLC player in my webapp build with Google's GWT. First I had a look at this page: http://wiki.videolan.org/GWT, which offers a nice solution but I add to implements all javascript functions calls (play, stop, fullscreen) with JSNI. Then I found gwt-player (hosted by Google code) which does all the job for me but the annoying part is that the project is not widely used (few posts each month on the project's group, not so many talks about it in blogs/forums...) Do you know another option to easly embed & control a VLC player in a GWT app ? My main goal is to play any video/audio file in a webapp and offer the user a fast/forward feature (set rate in VLC), is there any other player I could use ? I already had a look at Quicktime, Windows Media player & Flowplayer, none of them offers as much features as VLC. Thanks in advance & have a nice new year's eve. Chris

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• What's wrong with the analogy between software and building construction?

  - by kuosan

  Many people like to think of building software as constructing a building so we have terms like building blocks and architecture. However, lately I've been to a couple of talks and most people say this analogy is wrong especially around the idea of having a non-coding software architect in a project. In my experience, good software architects are those who also write code so they won't design things that only looks good on paper. I've worked with several Architecture Astronauts, who have either limited or outdated experience in programming. These architecture astronauts quite often missed out critical details in their design and cause more harm than good in a project. This makes me wonder what are the differences between constructing a software and a building? How come in the building industry they can have architects who probably never build a house in their life and purely handles design work but not in the software development field?

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• WPF win app and browser app

  - by pdiddy

  I'm hearing this alot, that you can develop an app in WPF and run it as a desktop app or in a browser. Is this really true? I've install visual studio 2010 and I see 2 project templates : WPF Windows Application and WPF Browser Application (XBAP). Currently reading a book on WPF, it talks about Page-Base app, which can be use for navigation. To creatre an app to run on your browser you have to use the WPF Browser Application. So if I start with WPF Windows Application template can I run it in a browser ? I am assuming not since most of my class will be Window and not Page ....

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• What does Siebel Error SBL-BPR-00176 mean?

  - by braveterry

  My webapp talks to Siebel just fine in one test environment, but in another we are getting the following error message: <Exception> <Major No.>256</Major No.> <Minor No.>6750384</Minor No.> <Message> The workflow/task engine cannot determine a next step while executing process definition 'Dynamic Pricing Procedure'. The last step that it executed was 'Start'.(SBL-BPR-00176) </Message> <DetailedMessage>Unknown<DetailedMessage> </Exception> Any idea about what the error message means and what we might do to get around it?

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• WCF performance improvements

  - by Burt

  I am developing a WPF application that talks to a server via WCF services over the internet. After profiling the application I noticed a lot of time is being taking up by creating the appropriate WCF client proxy and making the call to the server. The code on the server is optimised and doesn't take any time to run yet I am still seeing a 1.5 second delay from when a service is invloked to it returning to the client. A few points to give a bit of background: I am using the ASP.Net membership for security I will eventually hook into the same server side code through a website I would eventually like to have offline support in the application I really need to nail the performance early though as if the app is taking a couple of seconds to come back it is too long for what I am trying to do. Can anyone suggest performance tips that will help me please?

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• Hardware Emulator / Simulator for Winforms .Net Application

  - by Suneet

  I have a WinForms .Net HMI software which talks to hardware over USB. I check for communication with the hardware at Load time and if communication is active then run it (The hardware manufacturer has provided a communication library to talk over USB). I want to build an emulator for cases when communication with hardware is not possible (not connected) and want the software to run in simulated mode by providing dummy values for different states of hardware. Has anyone implemented something similar? Any pointers will be helpful. Are there any design patterns to handle such implementations. TIA

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• Oracle Linked Server error: ORA-12640: Authentication adapter initialization failed

  - by Chenster

  I have a linked server on SQL Server that talks to Oracle. Executing the following sql statement using Openquery SELECT * FROM OPENQUERY(finance, 'select * from KFRI.VW_XREF_PROJECTS') will get error as the following: OLE DB provider "OraOLEDB.Oracle" for linked server "finance" returned message "ORA-12640: Authentication adapter initialization failed". Msg 7303, Level 16, State 1, Line 1 Cannot initialize the data source object of OLE DB provider "OraOLEDB.Oracle" for linked server "finance". I tried to set : SQLNET.AUTHENTICATION_SERVICES= (NONE) in {$ORACLE_HOME}\NETWORK\ADMIN\sqlnet.ora. It did not help. What's interesting is my coworker is able to execute the exactly same query successfully on his machine without a hitch. Any tips on how to fix this is greatly appreciated!!

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• django app using amazon aws s3 storage in stead of DB?

  - by farble1670

  new to python here so bear with me ... i'm looking at django for a rapid prototype to a photo sharing app with an amazon aws s3 storage back end. however, as far as i can tell, django is tailored toward the typical database MVC type of pattern. is there a way to for example provide a custom django model implementation that talks to s3 in stead of a DB? a custom DB engine? would either of these be practical, or am i looking in the wrong direction? thanks.

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• Static/Dynamic vs Strong/Weak

  - by Dan Revell

  I see these terms banded around all over the place in programming and I have a vague notion of what they mean. A search shows me that such things have been asked all over stack overflow in fact. As far as I'm aware Static/Dynamic typing in languages is subtly different to Strong/Weak typing but what that difference is eludes me. Different sources seem to use different different meanings or even use the terms interchangeably. I can't find somewhere that talks about both and actually spells out the difference. What would be nice is if someone could please spell this out clearly here for me and the rest of the world.

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• How to find out memory layout of your data structure implementation on Linux 64bit machine

  - by ajay

  In this article, http://cacm.acm.org/magazines/2010/7/95061-youre-doing-it-wrong/fulltext the author talks about the memory layouts of 2 data structures - The Binary Heap and the B-Heap and compares how one has better memory layout than the other. http://deliveryimages.acm.org/10.1145/1790000/1785434/figs/f5.jpg http://deliveryimages.acm.org/10.1145/1790000/1785434/figs/f6.jpg I want to get hands on experience on this. I have an implementation of a N-Ary Tree and I want to find out the memory layout of my data structure. What is the best way to come up with a memory layout like the one in the article? Secondly, I think it is easier to identify the memory layout if it is an array based implementation. If the implementation of a Tree uses pointers then what Tools do we have or what kind of approach is required to map it's memory layout? Thanks!

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• windbg/cdb hangs when bp hit

  - by aaron

  I have a problem where cdb or windbg hangs frequently, but not all the time, when I'm debugging with it and I attach to a specific application on my machine. I found this article: http://www.nynaeve.net/?p=164 which talks about a symbol loading race condition being the problem, but I can force load the symbols, actually have a breakpoint in-app work, and still have it hang elsewhere. Here is the stack from cdb itself when I attach to it with another debugger: ntdll!NtReadFile kernel32!ReadFile cdb!ReadNonConLine cdb!ConIn cdb!MainLoop cdb!main !analyze reports that APPLICATION_HANG_BusyHang is the problem bucket, and 'ReadNonConLine' is the offending function. as far as the stack goes: ffffffff`fffffffe 00000000`00000000 00000001`3f641498 00000000`0014ea50 : kernel32!ReadFile+0x86 00000000`000002a4 00000000`0014ebb0 00000000`00001000 00000000`00000000 : cdb!ReadNonConLine+0x6d ReadNonConLine has the string "g" at 0014ebb0 passed as a param, which may be part of the command I had at the hanging breakpoint (it was something like bp foo "dt a; g") ReadFile takes a handle as its first parameter. I'm surprised by the value -2, though, that doesn't look valid. Any help is appreciated. Thanks! Aaron

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• Using Protocol Buffers in J2EE?

  - by mlaverd

  Hello everyone, I have coded a server that uses Protocol Buffers in Java. A client talks to it using PB. I'd like to migrate the server code to J2EE and take advantage of the containers' built-in features like clustering. How can I have a service that receives PB messages and interprets them properly, and then gets them handled? I was thinking of a dedicated type of servlet, but how can it be done? I'm a J2EE newbie... I'm not familiar enough with J2EE application servers to know if there is a way to make that happen. P.S. I'm looking for a solution that uses TLS sockets directly. No overhead-causing middleman protocols like HTTP are welcome here. P.P.S. Open source solutions only please.

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• How can I schedule tasks in a WinForms app?

  - by Greg

  QUESTION: How can I schedule tasks in a WinForms app? That is either (a) what is the best approach / .NET classes/methods to use of (b) if there is an open source component that does this well which one would be recommended. BACKGROUND: Winforms app (.NET v3.5, C#, VS2008) I'm assuming I will run the winforms application always, and just minimise to the system tray when not in use Want a simple approach (didn't want to get into separate service running that UI winforms app talks to etc) Want to be able to let the user select how often to schedule the sync (e.g. hourly, daily - pick time, etc) Ability to at the times when the scheduler fires to run a chunk of code (assume it could be wrapped as a backgroundworker task for example) The application is always running & appears in the system tray

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• windows mobile 6.5 Gestures and DirectDraw

  - by ArjanW

  I'm trying to build a UI using directdraw in c#. For this im using a DirectDrawWrapper as sugested here. My initial tests setting up the screen work perfectly. But now i'd like to incorporate gesture recognition into the UI. So i instantiate a GestureRecognizer and tie it to the _form which also gets passed to the DirectDrawGraphics constructor, form = new Form(); _form.show(); _graphics = new DirectDrawGraphics(_form, CooperativeFlags.Fullscreen, BackbufferMode.Any); gestureRecognizer = new GestureRecognizer(); gestureRecognizer.TargetControl = _form; Pasting the whole DirectDrawWrapper code might be a bit to much, so let me try to formulate a question. I guess directdraw talks directly to the video memory, as it should. But then my form wont receive any messages, thus any eventhandlers i'v tied op to the GestureRecognizer wont be fired. How can i still receive any messages from the touchscreen?

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• How can I scale an image in a CSS sprite

  - by michael

  Hi, In this article, http://css-tricks.com/css-sprites/, it talks about how can I crop off a smaller image from 1 bigger image. Can you please tell me if it is possible/how I can crop off a smaller image and then scale the cropped off region before I lay it out? Here is an example from that article: A { background-image: url(http://www.jaredhirsch.com/coolrunnings/public_images/3deb155981/spriteme1.png); background-position: -10px -56px; } I would like to know how can I scale that image after I crop it from from spriteme1.png Here is the URL of the example: http://css-tricks.com/examples/CSS-Sprites/Example1After/ So I would like to know if I can make the icons next to Item1,2,3,4 smaller?

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• learning the Lower levels of computing

  - by Ben

  I am a software developer with four years experience in .Net development, I always like to keep up to date with the latest technologies (.net related normally) being released and love learning them. I didn't however go to university and learnt all I know through helpful colleagues, .Net courses, the internet and good old books. I feel that I am a good developer, but without learning the lower levels of a computer as you would in the first year of a computer related Uni course, I get lost when talking to people about a lot of more technical lower level computing. Is there a book(s) that anyone could recommend, that would cover the lower levels of what is going on when I click "Run" in Visual Studio? I feel out of my depth when my boss says to me "Thats running in the CPU cache" or "you're limited by disk reads there", and would like to feel more confident when talking about how the hardware talks to each other (CPU to RAM etc). Apologise if thats a vague question, or has been asked before (i did check and couldn't find anything on here that answers my question).

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• Rendering videos online using flash as3 and AIR, how does it work?

  - by David

  I came accross this link that talks about the technology used with Animoto.com And it seems like they use AIR to export their flash animations to bitmaps that ffmpeg compil as a movie. http://labs.animoto.com/2009/06/07/presenting-filmstrip/ "It also takes time to render, so what you’re seeing isn’t realtime. It’s a series of Flash-generated frames that have been saved out using AIR and processed into an MP4 after the fact using a utility called FFmpeg." Does that mean AIR is installed on the server? How would that work to export a dynamicaly created aninmation into a series of pics that ffmpeg can then easily convert into a movie? David

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• Including a pyd directly in a setup.py file

  - by Philippe Beaudoin

  I have a complex build process to generate a couple of python extension modules (.pyd). I want to include these in my setup.py for use with distutils. The distutils page talks in length about how to add extension modules from source, but I'd want to simply package these precompiled .pyd. What is the best practice to do this? Eventually, I'd also like to freeze everything in an executable with py2exe. Will I be able to do this if I directly specify the .pyd?

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• Take screenshot of DirectX full-screen application

  - by iconiK

  This boggles me. DirectX bypasses everything and talks directly to the device driver, thus GDI and other usual methods won't work - unless Aero is disabled (or unavailable), all that appears is a black rectangle at the top left of the screen. I have tried what other have suggested on several forums, using DirectX to get the back buffer and save it, but I get the same result: device-GetFrontBufferData(0, surface); D3DXSaveSurfaceToFile("fileName", D3DXIFF_BMP, surface, NULL, NULL); Is there any way to get a screenshot of another full-screen DirectX application when Aero is enabled?

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• Current ways to do data binding in .NET 3.5 with C# 3.0 and WinForms

  - by kryptic

  Hello Everyone, I have an existing C# 3.0 WinForms project with .NET 3.5 that talks to a MySQL database. I would like to use data binding (I'm new to this, so I've been doing all of the UI updates manually) to simplify things. I followed a link from this question to this article which mentions using a DataSet but also follows up with "my view on this topic is strongly in favor of Business Objects." Also that was with .NET 2.0. What are the current methods to use data binding with a WinForms application? What are their advantages in terms of simplicity, how much additional code is necessary, etc. For reference, I use an ORM approach to build objects with public properties from a database. I want to map these properties for each object onto UI elements like TextBoxes. There could be many properties for an object so I want to simplify the code to do this.

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• Using java classes in Grails

  - by RN

  I have a Java\Spring\Hibernate application - complete with domain classes which are basically Hibernate POJOs There is a piece of functionality that I think can be written well in Grails. I wish to reuse the domain classes that I have created in the main Java app What is the best way to do so ? Should I write new domain classes extending the Java classes ? this sounds tacky Or Can I 'generate' controllers off the Java domain classes ? What are the best practices around reusing Java domain objects in Grails\Groovy I am sure there must be others writing some pieces in grails\groovy If you know about a tutorial which talks about such an integration- that would be awesome !!! PS: I am quite a newbie in grails-groovy so may be missing the obvious. Thanks !!!

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• Migrating VseWss project to WspBuilder

  - by Khurram Aziz

  I have a VseWss project that I want to migrate to WspBuilder. The project has many features (Content Types, Fields, Lists, Event Listeners, Workflows, ASPX files, their code behind etc) and the project references couple of other assemblies as well. And it does the SafeControls entries and deploys the assemblies into GAC etc Important aspect is; the WSP that gets created from the VseWss is deployed to the production server and while migrating I want to preserve all of these things so that when I create the WSP from WspBuilder things are transparent for the Sharepoint Administrators. Please guide me how to proceed...any online tutorial or related stuff that talks about migrating a real world VseWss project (with 10-20 different types of features)

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• Generic Text Only printer driver mangles control codes

  - by Terry

  If an escape character (or most other characters < 0x20) is sent to the generic / text only printer it gets printed as a period. Using the code in the WinDDK is it possible to 'correct' this behaviour so that it passes it through unmodified? The general scenario for this is that some application ('user app') outputs a document to a windows printer. My application requires this data in plain text form and so what I do is run a generic / text only printer that talks to a virtual com port. This generally works fine except where the 'user app' outputs binary data to the print queue without using the correct mechanism (which seems to work fine on some printer drivers, such as the Epson POS ones, but not the generic / text only one). I've tried changing the print processor selection without success and also tried looking at the gtt files to see if I could readily map in these characters as though they were printable, but the minidriver tool won't let me do that. Any suggestions?

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