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• Python 2 vs Python 3 and Tutorial

  - by MR-J

  Hey guys. I am 12 years old and I have had a small amount of experience with BASIC. I am thinking about learning Python, but I’m not sure if I should learn the 2.6 version or the 3.0 version. I don’t really care about the support for libraries or anything along those lines quite yet. I was wondering if it is easier to code in 3.0 than 2.6. And is it more fun and productive? I would also appreciate it if you could point me in the right direction for a simple yet complete tutorial that is easy to understand and possible teaches Object Oriented Programing. I don’t really care if it teaches OOP or not. One more thing; if I do learn python, is it possible to easily compile a python source code file into a 'stand-alone' .exe file for Windows? I really liked that functionality in BASIC. Thanks!!!!

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• Problem with background color and Google Chrome

  - by Sergio del Amo

  Sometimes i get a broken background in Chrome. I do not get this error with any other browser. This is the simple CSS line responsible of the background color of body: body { background: black; color: white; font-family: Chaparral Pro, lucida grande, verdana, sans-serif; } This is exactly how i get this problem. I click a link included in an gmail's email and i get: I refresh the page and the background is colored complete. Does ayone knows about this problem?

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• Using a DataSet instead of custom business entities in soa and n-tier architecture

  - by kathy

  I’m working on a large and a high volume transactional enterprise application which has been designed using n-tire application architecture .And it was developed in the .NET platform utilizing C#,VB.NEt, Framework 3.5, ObjectDataSources, DataSet, WCF, asp.net update panel, JavaScript ,JSON, 3rd Party tools. The application is supposed to accomplish a really scalable / easily maintained / robust application / integrations, and to make sure that my services are created using a format that can be understood by other systems. The problem is, this application is about 70% complete but now I was wondering if the following would cause us future issues, I’m using a DataSet and a DataTable to (get /set) the data (form /to) the stored procedure in the database using the ObjectDataSources and was wondering if this would prevent my application from achieving the above goals. Actually, I am not anti-OO. I write lots of classes for different purposes, but I didn’t use the entity objects(custom business entities) instead of the previous way because I have a large database that may contain 50 tables and I was just afraid to create entities for each table and then in the future if I need to change the schema of the database, it might cause a huge affect on the application ?

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• Loose Coupling vs. Information Hiding and Ease of Change

  - by cretzel

  I'm just reading Code Complete by Steve McConell and I'm thinking of an Example he gives in a section about loose coupling. It's about the interface of a method that calculates the number of holidays for an employee, which is calculated from the entry date of the employee and her sales. The author suggests a to have entry date and sales as the parameters of the method instead of an instance of the employee: int holidays(Date entryDate, Number sales) instead of int holidays(Employee emp) The argument is that this decouples the client of the method because it does not need to know anything about the Employee class. Two things came to my mind: Providing all the parameters that are needed for the calculation breaks encapsulation. It shows the internals of the method on how it computes the result. It's harder to change, e.g. when someone decides that also the age of the employee should be included in the calculation. One would have to change the signature. What's your opinion?

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• Transactions not working for SubSonic under Oracle?

  - by Fervelas

  The following code sample works perfectly under SQL Server 2005: using (TransactionScope ts = new TransactionScope()) { using (SharedDbConnectionScope scope = new SharedDbConnectionScope()) { MyTable t = new MyTable(); t.Name = "Test"; t.Comments = "Comments 123"; t.Save(); ts.Complete(); } } But under Oracle 10g it throws a "ORA-02089: COMMIT is not allowed in a subordinate session" error. If I only execute the code inside the SharedDbConnectionScope block then everything works OK, but obviously I won't be able to execute operations under a transaction, thus risking data corruption. This is only a small sample of what my real application does. I'm not sure as to what may be causing this behavior; anyone out there care to shed some light on this issue please? Many thanks in advance.

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• PHP/MySQL database connection priority?

  - by Josh

  Hello, I have a production database where usage statistics for a service we're working on. I use php to periodically roll up different resolutions (day, week, month, year) of interesting statistics in buckets dictated by the resolution. The php application I've written "completes" its data when its run, such that it will calculate all the rolled-up statistics for the resolutions and periods since it was last run. This is useful if we want to turn this off to debug database performance issues, because I can turn it back on and have it complete its data set. The problem I have, is the calculations are fairly intensive and drive the QPS of the production database server up. Is there a way to set a "priority" on a particular database connection so that it will only use "off-cycles" to do these calculations? Maybe a proper response would be to replicate the tables I'm working on into a different stats database, but, unfortunately I don't have the resources in place to attempt such a thing (yet). Thanks in advance for any help, Josh

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• How do you deal with UAC when creating a process as a different user?

  - by sysrpl

  I am having an issue with UAC and executing a non interactive process as a different user (APIs such as CreateProcessAsUser or CreateProcessWithLogonW). My program is intended to do the following: 1) Create a new windows user account (check, works correctly) 2) Create a non interactive child process as new user account (fails when UAC is enabled) My application includes a administrator manifest, and elevates correct when UAC is enabled in order to complete step 1. But step 2 is failing to execute correctly. I suspect this is because the child process which executes as another user is not inheriting the elevated rights of my main process (which executes as the interactive user). I would like to know how to resolve this issue. When UAC is off my program works correctly. How can I deal with UAC or required elevated rights in this situation? If it helps any, the child process needs to run as another user in order to setup file encryption for the new user account.

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• Any working tutorials for Authlogic?

  - by Mark Wilbur

  I've been trying to build my first rails app and have gotten stuck on the issue of user authentication. I've found a number of tutorials for using various plug-ins to do this, but so far every single one of them is out-dated, and as a result, broken! From what I've read, I think Authlogic may be the best fit for me, and I've tried two things: 1) Going through Railscast, episode #160 (which is a tutorial for setting it up) 2) Using Ryan B's nifty_authentication gem with the --authlogic tag In both cases, I get the following error as soon as I try to do anything with a user: undefined local variable or method `acts_as_authentic' for # I believe this is from the User model: class User < ActiveRecord::Base acts_as_authentic end I'm sure I've installed the authlogic gem, and I've added config.gem "authlogic" to my environment.rb Any ideas about what's wrong? Anybody know of a complete and up to date tutorial for adding user authentication?

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• Javascript progress bar

  - by srinath

  I want to have a progress bar (e.g. 200 links total, 20 done, therefore 10% complete). The bar should show when i click on button "validate now" . My requirement is to check 2000 urls which are working or not . This was taking a lot of time while executing in program . so i need to show a progress bar on user end to know the status Can any one please help me using on javascript . thanks, sri..

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• Using ClaimsPrincipalPermissionAttribute, how do I catch the SecurityException?

  - by Ryan Roark

  In my MVC application I have a Controller Action that Deletes a customer, which I'm applying Claims Based Authorization to using WIF. Problem: if someone doesn't have access they see an exception in the browser (complete with stacktrace), but I'd rather just redirect them. This works and allows me to redirect: public ActionResult Delete(int id) { try { ClaimsPrincipalPermission.CheckAccess("Customer", "Delete"); _supplier.Delete(id); return RedirectToAction("List"); } catch (SecurityException ex) { return RedirectToAction("NotAuthorized", "Account"); } } This works but throws a SecurityException I don't know how to catch (when the user is not authorized): [ClaimsPrincipalPermission(SecurityAction.Demand, Operation = "Delete", Resource = "Customer")] public ActionResult Delete(int id) { _supplier.Delete(id); return RedirectToAction("List"); } I'd like to use the declarative approach, but not sure how to handle unauthorized requests. Any suggestions?

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• Programmer productivity by programming language?

  - by Jason Baker

  In code complete, there's a nice table listing how productive a programmer is depending on language. Jeff Atwood has a nice blog post about it. This chart is at least 4 years old by now. I'm curious: have there been any more recent studies done on this? (insert standard anti-flamewar boilerplate here... we're all adults) Update: I appreciate everyone's opinions on the subject and whether or not this is a relevant question or not. But that's not really what I'm asking for. I'm wanting any studies on the subject. I'm inclined to agree with most of the opinions posted thus far, but I'd like to see if there's any research to back that up. And I'm also aware that choice of programming language is a complicated subject that depends on other factors like developer familiarity. To me, this is all the more reason to have these kinds of discussions backed by research. Also, thanks for the link, Robert Gamble.

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• SMO missing dll on a clients

  - by Dale

  I've created an app that connects remotely to SQL Server 2008. SQL connections work and all traditional oCommand.ExecuteNonQuery(), work great! But my SMO class using server.ConnectionContext.ExecuteNonQuery(scriptfile); ERROR: missing batch parsing.dll . I can't install these independent utils on a client machines, and then take them all off when done: as suggested by: http://www.microsoft.com/downloads/details.aspx?displaylang=en&FamilyID=228de03f-3b5a-428a-923f-58a033d316e1 Since my bulk-inserts are large memory hogs containing complete tables, I wrote the tables to a temptable.sql files and used SQLCMD Util and later switch too SMO and I have the same problem. Neither of these can be leveraged on the client's PCs . Any suggestion? thanks :-)

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• Team Foundation Error: The request ID is incorrect or not recognized

  - by Andrei

  Hello everybody. I'm trying to connect to the Team Foundation Server's ClientService.asmx web services. Over here, the TFS has webservices for retrieving work items, queries, metadata and more...a quite complete and useful set of information to get. My problem is that trying to access these services leads to an error: TF51313: The request ID is incorrect or not recognized I assume it has something to do with the RequestHeader Id structure. I give it a GUID inside the code I'm working on, but I don't know how correct it is...or what value it should have to begin with. Note: I can't use the TFS API/SDK because I am building a mobile application. Also an application on the TFS server side to communicate with the API and expose web services is not an option. Thanks.

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• Unique ID for WORD2007 paragraph

  - by Ganish

  Hello, I am writing large WORD2007 socuments, which are often being changed. I ahve to number paragraphs with stationary unique unmbers, that will not change while changing the documents. The numbers should be unique, and will not change even if previous numbers are deleted. The order of the list is not mandatory, and addition of a new number before existing numbers is possible (for instance: the sequence 1, 4, 3 means that paragraphs 1-3 were written, then #2 was deleted, then #5 was added. #3 was not affected by the later editing) The mechanism should be internal to the document, as I am working on line and off line. The numbers are allocated to every document indovidually. Since I don't know to program under WORD, I'd appreciate getting complete solution. REgards Ganish

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• Pinvoke- to call a function with pointer to pointer to pointer parameter

  - by jambodev

  complete newbe in PInvoke. I have a function in C with this signature: int addPos(int init_array_size, int *cnt, int *array_size, PosT ***posArray, PosT ***hPtr, char *id, char *record_id, int num, char *code, char *type, char *name, char *method, char *cont1, char *cont2, char *cont_type, char *date1, char *date_day, char *date2, char *dsp, char *curr, char *contra_acc, char *np, char *ten, char *dsp2, char *covered, char *cont_subtype, char *Xcode, double strike, int version, double t_price, double long, double short, double scale, double exrcised_price, char *infoMsg); and here is how PosT looks like: typedef union pu { struct dpos d; struct epo e; struct bpos b; struct spos c; } PosT ; my questions are: 1- do I need to define a class in CSharp representing PosT? 2- how do I pass PosT ***posArray parameter across frm CSharp to C? 3- How do I specify marshaling for it all? I Do appreciate your help

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• Analysing a Visual Foxpro application to derive requirements. Tools/approaches/practices?

  - by Kabeer

  Hello. In an upcoming project I am supposed to re-engineer a huge application built on Visual Foxpro into a web-application. The target platform is .Net. The application from the end-users' perspective is very complex (complex forms, reports, navigation, etc). The sorry state is that there are no documents available from which I can derive, business processes, business rules, work-flows, validations, application state, etc. I can gather some requirements from end-users but it cannot be complete from any perspective. Maneuvering through the code would be tedious & time consuming, given the millions of lines of code. Therefore I am looking for a tool that can help me in code analysis. My googling attempt didn't help me at least for a Visual Foxpro code base. Besides, I will appreciate if someone can share processes/approaches/techniques to establish the requirements as far as possible. BTW, this link didn't quite help.

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• Polygon packing 2D

  - by Ilnur

  Hi! I have problem of packing 2 arbitrary polygons. I.e. we have 2 arbitrary polygons. We are to find such placement of this polygons (we could make rotations and movements), when rectangle, which circumscribes this polygons has minimal area. I know, that this is a NP-complete problem. I want to choose an efficient algorithm for solving this problem. I' looking for No-Fit-Polygon approach. But I could't find anywhere the simple and clear algorithm for finding the NFP of two arbitrary polygons.

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• Getting started with Windows Azure

  - by jonhobbs

  Hi All, I'm going to sound like a complete newbie here but here goes... I've just signed up for a Windows Azure account and was hoping to get a simple hello world aspx page up and running in a browser to see how it all works but I can't seem to find a simple guide to getting a very simple web application running. I've got as far as setting up a "service" and going onto the "deploy" page but it's asking me upload an "application package". I've looked on MSDN but there aren't any simple guides, just reams of documentation talking about "roles" and "development fabric". For somebody that is proficient in HTML/CSS and knows a little abit about asp.net it may just as well be in another language. So, does anybody know how to upload a simple aspx page and then access it in a browser? Jon

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• Subsonic 3 Simple Repository And Transactions

  - by ChrisKolenko

  Hey everyone, So this is what I have so far. Am I doing something wrong or is there a bug in 3.0.0.3? var Repository = new SimpleRepository("DBConnectionName"); using (TransactionScope ts = new TransactionScope()) { using (SharedDbConnectionScope scs = new SharedDbConnectionScope("connstring", "providerName")) { try { for (int i = 0; i < 5; i++) { Supplier s = new Supplier(); s.SupplierCode = i.ToString(); s.SupplierName = i.ToString(); Repository.Add<Supplier>(s); } ts.Complete(); } catch { } } } I'm getting an error in SubSonic DbDataProvider public DbConnection CurrentSharedConnection { get { return __sharedConnection; } protected set { if(value == null) { __sharedConnection.Dispose(); etc.. __sharedConnection == null :( Object Null Reference Exception :(

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• PublishPost method example for Actionscript API Facebook connect required

  - by freddelm

  I established an extended permission with Facebook connect, works like a charm, but i just can't seem to publish messages on my wall. i keep getting this error: error code 100: Invalid parameter my code: var message:String = "test facebookconnect"; var publishpost:PublishPost = new PublishPost(message, null, null, null); publishpost.addEventListener(FacebookEvent.COMPLETE, function(e:FacebookEvent) { MonsterDebugger.trace(this, e); }); publishpost.addEventListener(FacebookEvent.ERROR, function(e:FacebookEvent) { MonsterDebugger.trace(this, e); }); publishpost.addEventListener(FacebookEvent.CONNECT, function(e:FacebookEvent) { MonsterDebugger.trace(this, e); }); fldFacebook.post(publishpost); Any clear examples/tutorials would help a lot in how to use this publishpost with the actionscript API thanks in advance.

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• An approximate algorithm for finding Steiner Forest.

  - by Tadeusz A. Kadlubowski

  Hello. Consider a weighted graph G=(V,E,w). We are given a family of subsets of vertices V_i. Those sets of vertices are not necessarily disjoint. A Steiner Forest is a forest that for each subset of vertices V_i connects all of the vertices in this subset with a tree. Example: only one subset V_1 = V. In this case a Steiner forest is a spanning tree of the whole graph. Enough theory. Finding such a forest with minimal weight is difficult (NP-complete). Do you know any quicker approximate algorithm to find such a forest with non-optimal weight?

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• Best practices book for CRUD apps

  - by Kevin L.

  We will soon be designing a new tool to calculate commissions across multiple business units. This new compensation scheme is pretty clever and well thought-out, but the complexity that the implementation will involve will make the Hubble look like a toaster. A significant portion of the programming industry involves CRUD apps; updating insurance data, calculating commissions (Joel included) ...even storing questions and answers for a programmer Q&A site. We as programmers have Code Complete for the low-level formatting/style and Design Patterns for high-level architecture (to name just a few). Where’s the comparable book that teaches best practices for CRUD?

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• What sense does asynchronous IO make if the thread is blocked anyway (see example)

  - by codymanix

  Hello, I found an example for async ftp upload on msdn which does the following (snippet): // Asynchronously get the stream for the file contents. request.BeginGetRequestStream( new AsyncCallback (EndGetStreamCallback), state ); // Block the current thread until all operations are complete. waitObject.WaitOne(); The thing what I do not understand here is, which sense does asynchronous IO make if the thread is blocked anyway with an explicit waithandle. I always thought the advantage of asynchronous IO was that the user/programm does not have to wait.

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• How to use Cassandra's Map Reduce with or w/o Pig?

  - by UltimateBrent

  Can someone explain how MapReduce works with Cassandra .6? I've read through the word count example, but I don't quite follow what's happening on the Cassandra end vs. the "client" end. https://svn.apache.org/repos/asf/cassandra/trunk/contrib/word_count/ For instance, let's say I'm using Python and Pycassa, how would I load in a new map reduce function, and then call it? Does my map reduce function have to be java that's installed on the cassandra server? If so, how do I call it from Pycassa? There's also mention of Pig making this all easier, but I'm a complete Hadoop noob, so that didn't really help. Your answer can use Thrift or whatever, I just mentioned Pycassa to denote the client side. I'm just trying to understand the difference between what runs in the Cassandra cluster vs. the actual server making the requests.

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• IIS load balancing and site deployment

  - by KLC

  Hi, currently I have a site sits on one IIS7 server. When we deploy a new version of the site, we bring the site down and display an offline page. What I really want is have two same exact copies of the site sits in one IIS 7 server and load balance users among both servers. when we deploy a new version of the site, we will bring site1 down (users in site1 automatically routes to site2 on next postback), when site1 deployment is complete, bring site2 down (users in site2 being routes to site1 on next postback). is this even possible?

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