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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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• Ruby on Rails protect_from_forgery best practice

  - by randombits

  I'm currently working on building a RESTful web api with ruby on rails. I haven't bothered putting a proper authentication scheme into the API yet as I'm ensuring that tests and the basic behavior of the API is working all locally first. Upon testing non-HTTP GET type requests such as HTTP POST/DELETE/PUT, stuff chokes because protect_from_forgery is on by default. How does this work when I'm working in practice since essentially the idea is in a RESTful API that there is no state. The client does not have a session or a cookie associated with the server. Each request is an atomic, self-executed request. The user will supply some credentials to ensure they are who they say they are, but other than that, does protect_from_forgery make sense at this point? Should it remain enabled?

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• Wrapping a C# service in a console app to debug it.

  - by Jack Smit

  I want to debug a service written in C# and the old fashioned way is just too long. I have to stop the service, start my application that uses the service in debug mode (Visual studio 2008), start the service, attach to the service process and then navigate in my Asp.Net application to trigger the service. I basically have the service running in the background, waiting for a task. The web application will trigger a task to be picked up by the service. What I would like to do is to have a console application that fires the service in an effort for me to debug. Is there any simple demo that anybody knows about? Thank you Jack

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• What are Windows code pages?

  - by Mike D

  I'm trying to gain a basic understanding of what is meant by a Windows code page. I kind of get the feeling it's a translation between a given 8 bit value and some 'abstraction' for a given character graphic. I made the following experiment. I created a "" character literal with two versions of the letter u with an umlaut. One created using the ALT 129 (uses code page 437) value and one using the ALT 0252 (uses code page 1252) value. When I examined the literal both characters had the value 252. Is 252 the universal 8 bit abstraction for u with an umlaut? Is it the Unicode value? Aside from keyboard input are there any library routines or system calls that use code pages? For example is there a function to translate a string using a given code table (as above for the ALT 129 value)?

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• How to create SSIS package to update from one database to another database within same server

  - by Pavan Kumar

  My query is related to the answers i got for questions i had posted earlier in the same forum. I have a copy of a client database which is attached to SQL Server where the Central Database exists. The copy already contains the updated data. I just want to update from that copy to Central Database both holding same schema and are present in the same server using C# .NET. One of the solution i got was to create SSIS package and run it from the UI. I want to know as how i can create SSIS Package to achieve this. I am new to SSIS. I am using SQL Server 2005 Standard Edition and Visual Studio 2008 SP1 installed. I learnt that BIDS 2005 is used to create packages which comes by default with SQL Server 2005. Can someone please give me a example as i am new to this.

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• How can a Delphi TForm / TPersistent object calculate its own construction and deserialization time?

  - by mjustin

  For performance tests I need a way to measure the time needed for a form to load its definition from the DFM. All existing forms inherit a custom form class. To capture the current time, this base class needs overriden methods as "extension points": start of the deserialization process after the deserialization (can be implemented by overriding the Loaded procedure) the moment just before the execution of the OnFormCreate event So the log for TMyForm.Create(nil) could look like: - 00.000 instance created - 00.010 before deserialization - 01.823 after deserialization - 02.340 before OnFormCreate Which TObject (or TComponent) methods are best suited? Maybe there are other extension points in the form creation process, please feel free to make suggestions. Background: for some of our app forms which have a very basic structure (with some PageControls and QuantumGrids) I realized that it is not database access and other stuff in OnFormShow but the construction which took most of the time (around 2 seconds) which makes me wonder where this time is spent. As a reference object I will also build a mock form which has a similar structure but no code or datamodule connections and measure its creation time.

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• Informix & .NET

  - by Giuliano

  I'm connecting to Informix 6.5 using the IBM OLE DB Driver. Some clarification: Informix Dynamic Server Workgroup Edition. Please note that there are many versions of IDS/WE - it helps to be precise about which version you have. It might be something like 10.00.TC1; the version number could be as old as 7.xx.TCx, or as new as 11.50.TCx. If your server is not on Windows but on Unix - or is on 64-bit Windows - the letter 'T' would change to 'U' (32-bit Unix) or 'F' (64-bit - Unix or Windows), or even 'H' (a particular HP-UX configuration). When I try to create a dataset using the VS DataSet wizard, after clicking on test connection it tells me 'Base Table not found'? The OLEDB driver is the official one provided by IBM. The problem with the 'Table not found' dialog is that Visual Studio doesn't tell me the table name but only the error! Has anyone else had this problem?

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• IoC and Design Time

  - by benPearce

  I have a WPF application which I am using to learn MVVM and IoC. The problem is that the Model used by one of the Views expects to pull one of its dependancies in the constructor from an IoC container. When working on this View in the Visual Studio designer it cannot show the design because an exception is being raised in the model. Is there a way around this? Am I pulling my dependancies in the wrong place in code or is there a way I can pass in constructed dependancies, perhaps through Constructor injection. At present the IoC container is setup in code in App.xaml.cs. The IoC container is a roll-your-own taken from this article on MSDN - http://msdn.microsoft.com/en-us/magazine/cc337885.aspx

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• Webbrowser javascript errors

  - by Gaby

  HI, I use a WebBrowser control to navigate to a html page which contains JavaScript. When I open this page in the IE browser no JavaScript error is shown and the page is displayed and functions perfectly. But when navigating to the same page with the WebBrowser control, a pop-up appears to inform about a Script error. I have tried to suppress the script error with the ScriptErrorsSuppressed property but now another pop-up comes up with the title "Visual Studio Just-In-Time Debugger" and proposes to debug. How can i disable all the errors?

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• Problems with installing jcc and pylucene

  - by Christian

  I'm trying to install pylucene on Windows XP. I installed JDK on C:\Programme\Java\jdk1.6.0_18 . I also installed Visual Studio C++ Express to have a C++ compiler. As first step I'm trying to integrate jcc into python2.6 through the command: C:\Python26\python.exe setup.py build This gives me the following result: C:\Installfiles\pylucene-3.0.1-1\jcc>C:\Python26\python.exe setup.py build Traceback (most recent call last): File "setup.py", line 332, in <module> main('--debug' in sys.argv) File "setup.py", line 289, in main raise type(e), "%s: %s" %(e, args) WindowsError: [Error 2] Das System kann die angegebene Datei nicht finden: ['jav ac.exe', '-d', 'jcc/classes', 'java/org/apache/jcc/PythonVM.java', 'java/org/apa che/jcc/PythonException.java'] Other information: In systems I set: Uservariables: CLASSPATH C:\Programme\Java\jdk1.6.0_18\bin\javac.exe System Variables Path %SystemRoot%\system32;%SystemRoot%;%SystemRoot%\System32\Wbem; C:\Programme\Java\jdk1.6.0_18\bin Where does the error come from and what do I have to do to overcome it?

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• Can I expose only a portion of one .NET DLL's public classes via a different "API" DLL?

  - by Ben McIntosh

  I am designing a WPF application that uses a DLL with maybe 40 public classes. I need these to be public for a variety of reasons including ease of data binding and obfuscation. I would like to allow other people to use only a portion of these classes as an API for my software. I thought I would create the main library (core.dll) and an API library (coreAPI.dll) with the API DLL to be referenced in a new project. Is there a way to allow coreAPI.dll to expose only a few of the classes that exist in core.dll? It's not so much a security issue as I primarily want to simply hide some of the unwanted classes from the Visual Studio Intellisense. Again, internal classes for the ones I want to hide is not really an option because I need to data bind some of these classes in WPF and for that, they must be public. Are there any other ways of doing this?

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• Struts2 <s:bean/> tag, used to instanciate a Parametric Bean

  - by Rasatavohary

  Hi, After looking a while other google, and the web, I decided to post my question here. The question is quite really basic, and simple : How do I use the struts2 tag <s:bean ... /> to instanciate a Parametric Bean ? For example imagine I have : public class GenericBean<T> { ... How will I instanciate this bean with a BeanType for instance, inside a jsp using struts 2 ? <s:bean name="GenericBean" var="myBean"/> Thanks you.

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• Exposing.NET assembly as COM 101

  - by Jan Zich

  I have trouble to expose a .NET assembly in COM. It seems that I must be missing some basic step because I think I followed all tutorials and documentation I found as well as common sense, but still when I do (in a test VBScript): Set o = CreateObject("MyLib.MyClass") It keeps saying that the object cannot be created. Here are the steps I have done: I have simple one method dummy class with no attributes. The class is in a class library which has "Make assembly COM-visible" ticked in Visual Studio. The class library is signed. The DLL is registered via RegAsm.exe with the /codebase parameter (I don’t want / cannot add the DLL to GAC). Just to be sure, I tried to copy the library to the same directory as the test VBScript, but it does not help. Edit: I should have mentioned that the I can instantiate the class in COM if I put the DLL into GAC.

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• Firebug not showing Javascript errors for Rails applications

  - by 99miles

  I have a Rails application, and when I have Javascript errors they are not showing in the Firebug console. I have 'Show javascript errors' and 'Show javascript warnings' selected. When I insert javascript errors in a basic html file, the errors show as expected. In the javascript of the Rails app, it only shows errors in rare cases. For example i can insert nonsense like: dfghaefb; and no error is shown in Firebug. But if i insert a space in there Firebug does show the error: dfgh aefb; Any ideas? This is driving me nuts.

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• Does "Debug" invalidate ASP.Net MVC OutputCache?

  - by William Edmondson

  I have images stored in a database and am serving them from an MVC controller as "FileResult". If I run the MVC application from Visual Studio 2008 in debug mode and set a break point inside the controller method the debugger intercepts the call on every page refresh regardless of my "OutputCache" settings. Does the VS debugger invalidate the OutputCache or is there something else going on here? [OutputCache(Duration = 86400, VaryByParam = "id")] public FileResult Index(string id) { byte[] image; int imageId; int.TryParse(id, out imageId); using (var ctx = new EPEntities()) { var imageObj = (from images in ctx.Images where images.ID == imageId select images).FirstOrDefault(); image = imageObj.Image; } return new FileContentResult(image, "image/gif"); }

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• LINQ aggregate / SUM grouping problem

  - by Chrissi

  I'm having trouble getting my head around converting a traditional SQL aggregate query into a LINQ one. The basic data dump works like so: Dim result = (From i As Models.InvoiceDetail In Data.InvoiceDetails.GetAll Join ih As Models.InvoiceHeader In Data.InvoiceHeaders.GetAll On i.InvoiceHeaderID Equals ih.ID Join p As Models.Product In Data.Products.GetAll On i.ProductID Equals p.ID Join pg As Models.ProductGroup In Data.ProductGroups.GetAll On p.ProductGroupID Equals pg.ID Join gl As Models.GLAccount In Data.GLAccounts.GetAll On pg.GLAccountSellID Equals gl.ID Where (gl.ID = GLID) Select ih.Period,i.ExtendedValue) What I need to really be getting out is ih.Period (a value from 1 to 12) and a corresponding aggregate value for i.ExtendedValue. When I try to Group ih I get errors about i being out of scope/context, and I'm not sure how else to go about it.

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• Can you help me think of problems for my programming language?

  - by I can't tell you my name.

  I've created an experimental toy programming language with a (now) working interpreter. It is turing-complete and has a pretty low-level instruction set. Even if everything takes four to six times more code and time than in PHP, Python or Ruby I still love programming all kinds of things in it. So I got the "basic" things that are written in many languages working: Hello World Input - Output Countdowns (not as easy as you think as there are no loops) Factorials Array emulation 99 Bottles of Beer (simple, wrong inflection) 99 Bottles of Beer (canonical) Conjatz conjecture Quine (that was a fun one!) Brainf*ck interpreter (To proof turing-completeness, made me happy) So I implemented all of the above examples because: They all used many different aspects of the language They are pretty interesting They don't take hours to write Now my problem is: I've run out of ideas! I don't find any more examples of what problems I could solve using my language. Do you have any programming problems which fit into some of the criteria above for me to work out?

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• App engine datastore - query on Enum fields.

  - by Gopi

  I am using GAE(Java) with JDO for persistence. I have an entity with a Enum field which is marked as @Persistent and gets saved correctly into the datastore (As observed from the Datastore viewer in Development Console). But when I query these entities putting a filter based on the Enum value, it is always returning me all the entities whatever value I specify for the enum field. I know GAE java supports enums being persisted just like basic datatypes. But does it also allow retrieving/querying based on them? Google search could not point me to any such example code. Details: I have printed the Query just before being executed. So in two cases the query looks like - SELECT FROM com.xxx.yyy.User WHERE role == super ORDER BY key desc RANGE 0,50 SELECT FROM com.xxx.yyy.User WHERE role == admin ORDER BY key desc RANGE 0,50 Both above queries return me all the User entities from datastore in spite of datastore viewer showing some Users are of type 'admin' and some are of type 'super'.

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• Using FourSquare API in a Rails App

  - by MikeH

  Anybody have any good resources that might be helpful in trying to integrate the FourSquare API into a Rails app? I'm specifically looking for a good tutorial. There doesn't seem to be much out there yet. There are a few ruby gems, but they are pretty bare bones and I need a bit more hand-holding. Here is a resource that I've found so far: http://tedgrubb.com/ Stack Overflow won't let me include a second hyperlink, but you can also google: Foursquare ruby gem for another resource. I have not done much work with APIs in the past, but I am very comfortable with Rails. What I need is a little better sense of exactly where all the pieces fit. A basic tutorial is what I'm looking for. Thanks.

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• telnetlib python example

  - by de1337ed

  So I'm trying this really simple example given by the python docs: import getpass import sys import telnetlib HOST = "<HOST_IP>" user = raw_input("Enter your remote account: ") password = getpass.getpass() tn = telnetlib.Telnet(HOST) tn.read_until("login: ") tn.write(user + "\n") if password: tn.read_until("Password: ") tn.write(password + "\n") tn.write("ls\n") tn.write("exit\n") print tn.read_all() My issue is that it hangs at the end of the read_all()... It doesn't print anything out. I've never used this module before so I'm trying to get this really basic example to work before continuing. BTW, I'm using python 2.4 Thank you.

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• MSDN Example of handling an exception from the TPL - Is this a race condition?

  - by David

  I'm looking at the TPL exception handling example from MSDN @ http://msdn.microsoft.com/en-us/library/dd537614(v=VS.100).aspx The basic form of the code is: Task task1 = Task.Factory.StartNew(() => { throw new IndexOutOfRangeException(); }); try { task1.Wait(); } catch (AggregateException ae) { throw ae.Flatten(); } My question is: Is this a race condition? What happens if task1 throws before the try has executed? Am I missing something that stops this being a race? Shouldn't it be written like this instead: try { Task task1 = Task.Factory.StartNew(() => { throw new IndexOutOfRangeException(); }); task1.Wait(); } catch (AggregateException ae) { throw ae.Flatten(); }

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• Webservice or WCF for compactframework.

  - by Tan

  Hi iam making a Windows mobile application thats connects to an WCF service with basic httpbinding. The mobile device talks directly to the WCF service by tcp. But the performace is really slow. So i tried to switch the mobile device talking to a Webservice (ASMX) then the webservice talks to WCF service. The respone and performace is much faster. Why is it so. Isnt WCF suppose to be faster and have greater performance then the old webservice. please advice and help.

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• OpenCL: does it play well with OpenMP, can I connect other languages to it, etc.

  - by Cem Karan

  The 1.0 spec for OpenCL just came out a few days ago (Spec is here) and I've just started to read through it. I want to know if it plays well with other high performance multiprocessing APIs like OpenMP (spec) and I want to know what I should learn. So, here are my basic questions: If I am already using OpenMP, will that break OpenCL or vice-versa? Is OpenCL more powerful than OpenMP? Or are they intended to be complementary? Is there a standard way of connecting an OpenCL program to a standard C99 program (or any other language)? What is it? Does anyone know if anyone is writing an OpenCL book? I'm reading the spec, but I've found books to be more helpful.

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• Why is VB so popular? [closed]

  - by aaaidan

  To me, Visual Basic seems clumsy, ugly, error-prone, and difficult to read. I'll let others explain why. While VB.net has clearly been a huge leap forward for the language in terms of features, I still don't understand why anyone would choose to code in VB over, say, C#. However, I still see (what seems to be) the vast majority of commercial web apps from "MS shops" are built in VB. I could stand corrected on this, but VB still seems more popular than it deserves. Can anyone help answer any (or all) of these questions: Am I missing something with VB? Is it easier to learn, or "friendlier" than C#? Are there features I don't know about? Why is VB/VB.net so frequently used today, especially in web projects?

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• How do i start Game programming in windows phone xna?

  - by Ankit Rathod

  Hello, I am very much interested in Game programming in Xna. However during my college days i did not take Physics or Maths. Does that mean i can't create games in xna? I just know basics of trignometry. Can you all point me to few links where i can learn xna as well as the basic stuff of Maths that is bound to be required in most of the games? Are all game programmers excellent in Maths and Physics ? Thanks in advance :)

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