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• Getting Started: Silverlight 4 Business Application

  - by Eric J.

  With the arrival of VS 2010 and Silverlight 4, I decided it's time to look into Silverlight and understand how to build a 3-Tier business application. After several hours of searching for and reading documentation and tutorials, I'm thoroughly confused (and that doesn't happen easily). Here are some specific points I don't understand. I welcome guidance on any of them, and also would appreciate any references to a really good tutorial. Brad Abrahm's What is a .NET RIA services (written for Silverlight 3) seemed very promising, until I realized I don't have System.Web.Ria.dll on my system. Am I missing an optional download? Was this rolled into another DLL for Silverlight 4? Did this go away in favor of something else in Silverlight 4? This recent blog says to start from a Silverlight Business Application, remove unwanted stuff, create a WCF RIA services Class Library project, and copy files and references from the Business Application to the WCF RIA services project, while manually updating resource references (perhaps bug in B2 compiler). Is this really the right road to go down? It seems very clumsy. My requirements are to perform very simple CRUD on straightforward business objects. I'm looking forward to suggestions on how to do that the Silverlight 4 way.

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• C# call a C++ dll get EntryPointNotFoundException

  - by 5YrsLaterDBA

  I was gaven a C++ dll file, a lib file and a header file. I need to call them from my C# application. header file looks like this: class Clog ; class EXPORT_MACRO NB_DPSM { private: string sFileNameToAnalyze ; Clog *pLog ; void write2log(string text) ; public: NB_DPSM(void); ~NB_DPSM(void); void setFileNameToAnalyze(string FileNameToAnalyze) ; int WriteGenbenchData(string& message) ; }; In my C# code, I have those code: internal ReturnStatus correctDataDLL(string rawDataFileName) { if (rawDataFileName == null || rawDataFileName.Length <= 0) { return ReturnStatus.Return_CannotFindFile; } else { setFileNameToAnalyze(rawDataFileName); } string msg = ""; int returnVal = WriteGenbenchData(ref msg); return ReturnStatus.Return_Success; } [DllImport("..\\..\\thirdParty\\cogs\\NB_DPSM.dll")] public static extern void setFileNameToAnalyze(string fileName); [DllImport("..\\..\\thirdParty\\cogs\\NB_DPSM.dll")] public static extern int WriteGenbenchData(ref string message); I got EntryPointNotFoundException at the setFileNameToAnalyze(rawDataFileName); statement. Few questions: do I need to add that lib file into somewhere of my C# project? how? do I need to add the header file into my C# project? how? (no compile error for now) I would like to remove those "..\\..\\thirdParty\\cogs\\" hardcode path. how to this? how to get ride of that EntryPointNotFoundException? thanks,

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• Sending a password securely using gwt and app engine?

  - by user246114

  Hi, I set up session handling on a google app project. This is supposed to allow my users to login and maintain state across pages. I just dumped it into the default greeting service to try it out: public class GreetingServiceImpl extends RemoteServiceServlet implements GreetingService { public void sessionTest(String username) { HttpSession session = getThreadLocalRequest().getSession(false); session.setAttribute("username", username); } } then attempting to pull it out in my landing project.jsp page: <% String username = null; HttpSession mysession = request.getSession(false); if (mysession.getAttribute("username") != null) { username = (String)mysession.getAttribute("username"); } else { username = "(not logged in yet)"; } <p>You are: <%= username %> </p> %> It works, but I don't know how to send the data in sessionTest() securely. If I were sending the user's password in there too, it would be in the clear. This would be ok (I think) if I was using https, but google app engine does not allow you to use https under custom domains (like www.mysite.com), they have to be under the (mysite.appspot.com) domain. I'm kind of stuck here - how do we send passwords securely? If I was using php, I think I could use digest authentication (I'm not too experienced here) - can we do something like that with gwt + gae? Thanks

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• Portable Eclipse

  - by Jeach

  I'm trying to port my entire 'workspace' to a USB key (including the Eclipse executable) so that I can carry my work anywhere with me and work off the key directly. My directory hierarchy is similar to this: /workspace/eclipse - Where my current eclipse binary is stored /workspace/codebase - Where I keep the root of all my eclipse projects /workspace/resources - Where I keep all project files (images, docs, libs, etc.) It all works perfectly fine on one system. But when I change over to another system, the USB key gets mounted on another drive. For example, on my laptop, I get 'E:\', on my PC, I get 'K:\' and at work I get 'F:\', etc, etc. This means that because Eclipse (for 'some' reason) seems to only use full path names (including driver letters) in every single one of its configuration files (such as .classpath), nothing ever works when I want to work on another system. I put a 'libs' directory in the base of every project and populate it with its dependent JAR files. Why doesn't it use relative names instead, so that I could specify something like "../../libs/log4j.jar"? Anyone know how to fix this problem? Does anyone know of a workaround for this? For some reason, I really doubt I'm the first developer to do this! Thanks for your help and any suggestions.

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• Releasing from development into production in maven

  - by Bruce

  Hi all, I'm confused about the use of maven in development and production environments - I'm sure it's something simple that I'm missing. Grateful for any help.. I set up maven inside eclipse on my local machine and wrote some software. I really like how it's made things like including dependent jars very easy. So that's my development environment. But now I want to release the project to production on a remote server. I've searched the documentation, but I can't figure out how it's supposed to work or what the maven best practice is.. Are you supposed to: a) Also be running maven on your production environment, and upload all your files to your production environment and rebuild your project there? (Something in me baulks at the idea of rebuilding 'released' code on the production server, so I'm fairly sure this isn't right..) b) use mvn:package to create your jar file and then copy that up to production? (But then what of all those nice dependencies? Isn't there a danger that your tested code is now going to be running against different versions of the dependent jars in the production environment, possibly breaking your code? Or missing a jar..?) c) Something else that I'm not figuring out.. Thanks in advance for any help!

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• Just 2 free months to learn or improve my skills

  - by microspino

  On the 30 of June I will leave my every day work to start as freelance developer. I'd like to set a period of 2 months apart to improve my dev skills. At work I code in C# and during my spare time I enjoyed building Ruby on Rails web applications and creating some Arduino prototypes. I'm something more than junior but I don't feel really a senior developer because I never had a big corporate project built and designed by me with help of other juniors (although I don't think this is really a good definiton of a "senior", It helps describing my feelings). Using a scale from 0 (ignorant) to 10 (proficient like a "samurai") the list below describes my skills that I would like to improve with just 2 months. I've already bought some nice and updated books on all the subjects hereunder: The order doesn't matter C = 1 C# & .Net = 6 Arduino & Processing = 2 Ruby = 5 Rails = 5 HTML/XHTML/CSS = 9 Javascript = 6 Objective-C/iPhone dev = 2 Python = 4 Django = 4 Desing Patterns = 3 Algorythms = 3 Git = 5 I haven't included SQL or Databases in general nor Networking because I spent 10 years working in the past with them and I feel pretty solid for now. As an aside, I've made up some interest in Redis, Node.js, HTML5 reading about them on the web. After two months, since I have to pay my bills, I could go searching for some new job. If learning and developing were really good maybe I could also invest on something I gave birth during them. Can You give me some piece of advice on which you think It's better to improve or develop a learning project on (something like a "summer of code" thing)? The all point Is to see my weaknesses and work on them.

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• Maven Assembly: include a dependency with a different classifier

  - by James Kingsbery

  I would like to build two different versions of a WAR in Maven (I know that's a no-no, that's just the way it is given the current situation). In the version of a WAR depicted by an assembly, I want to replace a dependency by the same dependency with a different classifier. For example, I was expecting this assembly to work: <assembly> <id>end-user</id> <formats> <format>war</format> </formats> <dependencySets> <dependencySet> <excludes> <exclude>group:artifact:jar:${project.version}</exclude> </excludes> <includes> <include>group:artifact:jar:${project.version}:end-user</include> </includes> </dependencySet> </dependencySets> </assembly> This doesn't work, but am I heading in the right direction? I've already read all the pages on the Maven assembly page and the section on the Maven Definitive Guide that seems relevant. Any pointers would be helpful.

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• How to test a C++ library usability in configure.in?

  - by jbatista

  Hi, I'm working on a C++ project and I'm looking for a way to test the existence and usability of IBM Informix's library with the Autotools - namely, editing a configure.in. I don't have experience with Autotools, so basically I'm picking up from the project's configure.in et al. scripts and copying&changing where I feel needs to be changed. IOW, I've been adapting from the existing text in configure.in. So far I've been using successfully the AC_ CHECK_ LIB in configure.in to test whether a certain library both exists and is usable. But this only seems to work with libraries with functions, not e.g. classes. Namely, this fails when testing Informix's libifc++.so: AC_CHECK_LIB(ifc++, ITString, INFORMIX_LIB="-L$INFORMIX_LIB_LOCATION/c++ -lifc++ -L$INFORMIX_LIB_LOCATION -L$INFORMIX_LIB_LOCATION/dmi -L$INFORMIX_LIB_LOCATION/esql -lifdmi -lifsql -lifasf -lifgen -lifos -lifgls -lifglx $INFORMIX_LIB_LOCATION/esql/checkapi.o -lm -ldl -lcrypt -lnsl", echo "* WARNING: libifc++.so not found!" INFORMIX_INC="" INFORMIX_LIB="" ) I've also tried using other combinations, like ITString::ITString, etc. I haven't found a "pure" function in Informix's API (i.e., one that isn't contexted in a C++ class). So I'm hoping that either there's a way to use AC_CHECK_LIB in this context, or there's another autoconf/configure.in "command" for this specific use. Thanks in advance for your feedback.

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• Heroku only initializes some of my models.

  - by JayX

  So I ran heroku db:push And it returned Sending schema Schema: 100% |==========================================| Time: 00:00:08 Sending indexes schema_migrat: 100% |==========================================| Time: 00:00:00 projects: 100% |==========================================| Time: 00:00:00 tasks: 100% |==========================================| Time: 00:00:00 users: 100% |==========================================| Time: 00:00:00 Sending data 8 tables, 70,551 records groups: 100% |==========================================| Time: 00:00:00 schema_migrat: 100% |==========================================| Time: 00:00:00 projects: 100% |==========================================| Time: 00:00:00 tasks: 100% |==========================================| Time: 00:00:02 authenticatio: 100% |==========================================| Time: 00:00:00 articles: 100% |==========================================| Time: 00:08:27 users: 100% |==========================================| Time: 00:00:00 topics: 100% |==========================================| Time: 00:01:22 Resetting sequences And when I went to heroku console This worked >> Task => Task(id: integer, topic: string, content: string, This worked >> User => User(id: integer, name: string, email: string, But the rest only returned something like >> Project NameError: uninitialized constant Project /home/heroku_rack/lib/console.rb:150 /home/heroku_rack/lib/console.rb:150:in `call' /home/heroku_rack/lib/console.rb:28:in `call' >> Authentication NameError: uninitialized constant Authentication /home/heroku_rack/lib/console.rb:150 /home/heroku_rack/lib/console.rb:150:in `call' update 1: And when I typed >> ActiveRecord::Base.connection.tables it returned => ["projects", "groups", "tasks", "topics", "articles", "schema_migrations", "authentications", "users"] Using heroku's SQL console plugin I got SQL> show tables +-------------------+ | table_name | +-------------------+ | authentications | | topics | | groups | | projects | | schema_migrations | | tasks | | articles | | users | +-------------------+ So I think they are existing in heroku's database already. There is probably something wrong with rack db:migrate update 2: I ran rack db:migrate locally in both production and development modes and nothing wrong happened. But when I ran it on heroku it only returned: $ heroku rake db:migrate (in /disk1/home/slugs/389817_1c16250_4bf2-f9c9517b-bdbd-49d9-8e5a-a87111d3558e/mnt) $ Also, I am using sqlite3 update 3: so I opened up heroku console and typed in the following command class Authentication < ActiveRecord::Base;end Amazingly I was able to call Authentication class, but once I exited, nothing was changed.

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• java web templates across multiple WAR files

  - by Casey

  I have a multi WAR web application that was designed badly. There is a single WAR that is responsible for handling some authorization against a database and defines a standard web page using a jsp taglib. The main WAR basically checks the privileges of the user and than based on that, displays links to the context path of the other deployed WARS. Each of the other deployed WARs includes this custom tag lib. I am working on redesigning this application, and one of the nice things that I want to retain is that we have other project teams that have developed these WAR modules that "plug into" our current system to take advantage of other things we have to offer. I am not entirely sure how to handle the page templates though. I need a templating system that would be easy enough to use across multiple wars (I was thinking of jsp fragments??). I really only need to define a consistent header and main navigation section. Whatever else is displayed on the page is up to the individual web project. Any suggestions? I hope that this is clear, if not I can elaborate more.

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• SharePoint 2010 MySites - Host on separate servers

  - by Chris W

  We're playing with the SP 2010 Beta ahead of a planned deployment later this year in an academic environment. We anticipate that the majority of traffic will be through MySites when everything is provisioned so we're looking at how we can plan our SP topology to scale nicely. An initial thought is to run the main portal on one server, host "Student" MySites on one server and "Staff" on another. Is it acutally possible to do this easily or are we going down a bad path? Specifically - can we have 2 different MySites site collections, each hosted on a dedicated server? If so, can we configure SharePoint to work out from the users's logon account type of user they are and route them to the correct server?

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• No database connection when trying to use IIS locally with asp.net MVC 1.0

  - by mark4asp

  Login failed for user ''. The user is not associated with a trusted SQL Server connection. When I try to use IIS locally instead of Cassini I get this error. The ASP.NET MVC 1.0 site is running on WinXP. The database is local and has SQL Server and Windows Authentification mode enabled. The website runs OK using Cassini, with the same connection string. It fails when I try to use IIS instead of Cassini. These permissions are set on the Virtual directory which IIS points to. ASP.NET Machine Account [Full Control] Internet Guest Account [Full Control] System [Full Control] This virtual directory is the same are the directory holding my project files. I am using Linq and the database connection string is stored in the App.config file of my data project. I get the same error whether I set the connection string to use Windows or Sql server authentification. My sql server has both [MyMachineName\ASPNET] and SqlServerUser Logins and a User on the database. CREATE LOGIN [MyMachineName\ASPNET] FROM WINDOWS WITH DEFAULT_DATABASE=[master], DEFAULT_LANGUAGE=[us_english] Use My_database CREATE USER [MyMachineName\ASPNET] FOR LOGIN [MyMachineName\ASPNET] WITH DEFAULT_SCHEMA=[dbo] CREATE LOGIN [MwMvcLg] WITH PASSWORD=N'blahblah', DEFAULT_DATABASE=[master], DEFAULT_LANGUAGE=[British], CHECK_EXPIRATION=OFF, CHECK_POLICY=ON Use My_database CREATE USER [MwMvcLg] FOR LOGIN [MwMvcLg] WITH DEFAULT_SCHEMA=[dbo] How come I have no problem running this website on IIS6 remotely. Why does IIS5.1, running locally, need these extra logins? PS: My overwhelming preference is to use Sql Server authentification - as this is how it runs when deployed.

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• Execute files included in Resource folder

  - by Sumeet Pujari

  In WPF application where I have included some files in resources, I want to execute them on a button click. How do I specify a path in Process.Start(). private void button1_Click_2(object sender, RoutedEventArgs e) { Process.Start("test.txt"); } Or is there any other way? private void button1_Click_2(object sender, RoutedEventArgs e) { string path = System.IO.Path.GetDirectoryName(Assembly.GetExecutingAssembly().Location) + @"\test.txt"; if (File.Exists(path)) { Process.Start(new ProcessStartInfo(path)); } else { MessageBox.Show("No file found"+path); } I added a message box and it showed No files found. :( EDIT: I Tried to check the path after publishing and this what i got. No File Found With a Path - C:\Users\Administrator\AppData\Local\Apps\2.0... test.txt Before I published the Application I got a path which id No File Found at ..project..\bin\Debug\test.txt which is obvious since my Resource file not included there its Under a Resource Folder and not Debug when i add a test file in debug it open without any problem. Can someone Help throwing some light on this case. EDIT: I want to open a file from Resource directory @ C:\Users\Administrator\Documents\Visual Studio 2010\Projects\FastFix\FastFix\Resources Which would be included in my project when i am going to publish it is going to run as a standalone application without installation.

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• Netbeans, JPA Entity Beans in seperate projects. Unknown entity bean class

  - by Stu

  I am working in Netbeans and have my entity beans and web services in separate projects. I include the entity beans in the web services project however the ApplicaitonConfig.java file keeps getting over written and removing the entries I make for the entity beans in the associated jar file. My question is: is it required to have both the EntityBeans and the WebServices share the same project/jar file? If not what is the appropriate way to include the entity beans which are in the jar file? <?xml version="1.0" encoding="UTF-8"?> <persistence version="2.1" xmlns="http://xmlns.jcp.org/xml/ns/persistence" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/persistence http://xmlns.jcp.org/xml/ns/persistence/persistence_2_1.xsd"> <persistence-unit name="jdbc/emrPool" transaction-type="JTA"> <provider>org.eclipse.persistence.jpa.PersistenceProvider</provider> <jta-data-source>jdbc/emrPool</jta-data-source> <exclude-unlisted-classes>false</exclude-unlisted-classes> <properties> <property name="eclipselink.ddl-generation" value="none"/> <property name="eclipselink.cache.shared.default" value="false"/> </properties> </persistence-unit> </persistence> Based on Melc's input i verified that that the transaction type is set to JTA and the jta-data-source is set to the value for the Glassfish JDBC Resource. Unfortunately the problem still persists. I have opened the WAR file and validated that the EntityBean.jar file is the latest version and is located in the WEB-INF/lib directory of the War file. I think it is tied to the fact that the entities are not being "registered" with the entity manager. However i do not know why they are not being registered.

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• Maven build issue with Hibernate for Windows

  - by wishi_

  Hi! I'm getting build errors for for my Maven enabled project related to the Hibernate extension. - It's a very basic app, and I was able to solve this issue on my Linux box by manually installing some required artifacts: mvn install:install-file -DgroupId=javassist -DartifactId=javassist -Dversion=3.9.0 -Dpackaging=jar -Dfile=foo.jar That worked out (Hibernate as a set of required deps). But in case of Windows things are different. How do I add the dependencies manually to Maven on Windows? 1) org.hibernate:hibernate:jar:3.3.2 Try downloading the file manually from the project website. Then, install it using the command: mvn install:install-file -DgroupId=org.hibernate -DartifactId=hibernate -Dversion=3.3.2 -Dpackaging=jar -Dfile=/path/to/file 2) javassist:javassist:jar:3.9.0 Can I automate this cumbersome manual dependency installation for my coworkers on their Windows machines? Are there any helpful tools or GUI that can perform these tasks? The best way would be that Maven does it all automatically. I'm not too familiar with it jet. Thanks for answers.

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• Stepping through ASP.NET MVC in Action (2009) - and stuck on nunit issue

  - by Jen

  I seem to have missed something - in this step through it talks through downloading nunit and changing the original MSTest reference to NUnit. Which seems fine until it talks about running the test with UnitRun from JetBrains. I would have thought I could run nUnit to be able to run the test - but I load my project in the nUnit gui and I get "This assembly was not built with any known testing framework". This after running the Nunit-2.5.3.9346.msi. Or am I supposed to be able to run tests from within visual studio 2008? After some research I find this: http://www.jetbrains.com/unitrun/ (ie. it seems to be saying this is no longer supported and I'm thinking JetBrains Resharper may cost money?). I'm a little rusty on my NUnit experience. So how do I go ahead and run my test? Is the error message I'm getting considered abnormal? I've added a reference in my MvcApplication.Tests project to the nunit.framework. Is this the wrong reference to add? Thanks :)

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• Using the XElement.Elements method, can I find elements with wildcard namespace but the same name?

  - by gav

  Hi All, Trying to do a simple parse of an XML document. What's the easiest way to pull out the two PropertyGroups below? <Project ToolsVersion="4.0" DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003"> <PropertyGroup xmlns="http://schemas.microsoft.com/developer/msbuild/2003"> 1 </PropertyGroup> <PropertyGroup xmlns="http://schemas.microsoft.com/developer/msbuild/2003"> 2 </PropertyGroup> </Project> I have been trying to use XElement.Elements(XName) but to do so I need to prefix PropertyGroup with the xmlns. The issue is that I don't care about the name space and if it changes in future I would still like all PropertyGroups to be retrieved. var xml = XElement.Load(fileNameWithPath); var nameSpace = xml.GetDefaultNamespace(); var propertyGroups= xml.Elements(nameSpace + "PropertyGroup"); Can you improve on this code such that I don't need to prepend with nameSpace? I know I can essentially just reimplement the Elements method but I was hoping there was some way to pass a wildcard namespace? Thanks, Gavin

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• How to embed revision information using mercurial and maven (and svn)

  - by Zwei Steinen

  Our project had a nice hack (although I'm guessing there are better ways to do it) to embed revision information into the artifacts (jar etc.) when we used svn. Now we have migrated to mercurial, and we want to have a similar thing, but before I start working on a similar hack with mercurial, I wanted to know if there are better ways to do this. Thanks for your answers! <plugin> <groupId>org.codehaus.mojo</groupId> <artifactId>exec-maven-plugin</artifactId> <executions> <execution> <phase>process-classes</phase> <id>svninfo</id> <goals> <goal>exec</goal> </goals> <configuration> <executable>svn</executable> <arguments> <argument>info</argument> <argument>../</argument> <argument>></argument> <argument>target/some-project/META-INF/svninfo.txt</argument> </arguments> </configuration> </execution> </executions> </plugin>

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• How do I get my Windows Forms application to use a custom main function and get access to the Applic

  - by burble

  Hi Folks I am trying to use a Main () function in a class to control the program flow in my vb .net Windows Forms application. I have added a splash screen component and a login screen, and customised my main sdi form. I have set the startup form to be my main function in the Application Page of the Project Designer, and everything seems to work fine(ish). However, I would like to use: Me.MinimumSplashScreenDisplayTime = 5000 to ensure that the splash screen is visible, but it is not recognised by the system unless I tick the Enable Application Framework check box on the Project Designer. If I do this, on startup the program ignores the login and splash screens and all my customisation and just displays a default Form1, even though I have also specified my splash screen in the AF dropdown list. Of course, there are alternative ways to delay a splash screen, such as putting the thread temporarily to sleep (which didn't seem to work), but I suspect that there are other things in the AF that I may want to use. Any suggestions on how I can get round this please, and get a sensible means of controlling program flow? Any thoughts on the best overall structure for organising program flow would also be helpful too. I am concerned both about going down a Microsoft or an alternative custom route that may cause me problems later, as the application becomes more complex. Thankses.

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• better understanding of getline() and cin

  - by numerical25

  Trying to get some basic understanding of console functionalities. I am having issues so consider the following... #include "stdafx.h" #include<iostream> #include<conio.h> using namespace std; /* This is a template Project */ void MultiplicationTable(int x); int main() { int value = 0; printf("Please enter any number \n\n"); getline(cin, value); MultiplicationTable(value); getchar(); return 0; } I actually based this off code from http://www.cplusplus.com/doc/tutorial/basic_io/ . My IDE is not recognizing getline() so of course when I compile the application. I get an error 'getline': identifier not found Now take a look at this code #include "stdafx.h" #include<iostream> #include<conio.h> using namespace std; /* This is a template Project */ void MultiplicationTable(int x); int main() { int value = 0; printf("Please enter any number \n\n"); cin>>value; MultiplicationTable(value); getchar(); return 0; } When I execute this line of code the console window opens and immediately closes. I think I a missing something about cin. I do know that it delimits spaces but I don't know what else. what should I use for input to make my life easier.

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• In the meantime, to be or not to be ... productive!

  - by Jan Kuboschek

  I just moved back to Europe from the US after living there for 7 years. Apart from major adjustment issues, I'm currently looking for a job over here. I'm mainly interested in (IT) Consulting and, since these jobs typically require programming knowledge, such as Java, I'm trying to think of something productive to write (perhaps to demo my skills) while I'm waiting for my interviews (starting in two weeks. Folks here are a bit slower than in the US apparently...). I graduated from college about a year and a half ago and have a 4 year degree in international management/economics and about 3/4 of a 2 year degree in computer science finished. I've written my fair share of web software over the years, but nothing concrete that I could show, especially not in Java. Now, I've never had the problem of not having any idea what to write. Basic games I could write, but I'm not sure how well that'll come over when I walk into my interview and say "hey, I was bored. Take a look at my multiplayer space invaders game! Wanna try beating me??". Any thoughts? I browsed SourceForge the other day to find a nice little project to contribute to, but decided that I don't want to commit to someone else's project at this time. Any ideas, perhaps from someone who has been, or currently is, in a similar position would be much appreciated. Oh, and lastly: Instead of developing a program or two to demonstrate my skills, I could spend my time brushing up on UML and Perl. Any suggestions regarding that? Writing a demo vs. learning something new?

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• Ways to access a 32bit DLL from a 64bit exe

  - by bufferz

  I have a project that must be compiled and run in 64 bit mode. Unfortunately, I am required to call upon a DLL that is only available in 32 bit mode, so there's no way I can house everything in a 1 Visual Studio project. I am working to find the best way to wrap the 32 bit DLL in its own exe/service and issue remote (although on the same machine) calls to that exe/service from my 64 bit app. My OS is Win7 Pro 64 bit. The required calls to this 32 bit process are several dozen per second, but low data volume. This is a realtime image analysis application so response time is critical despite low volume. Lots of sending/receiving single primitives. Ideally, I would host a WCF service to house this DLL, but in a 64 bit OS one cannot force the service to run as x86! Source. That is really unfortunate since I timed function calls to the WCF service to be only 4ms on my machine. I have experimented with named pipes is .net. I found them to be 40-50 times slower than WCF (unusable for me). Any other options or suggestions for the best way to approach my puzzle?

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• ASP.NET: how can I compile in DEBUG mode?

  - by Budda

  AFAIK, usual ASP.NET web site/web application switched on into DEBUG mode when web/app-config setting "compilation" has debug="false". But I don't clearly understand how it works. Let's consider example: I have <compilation debug="true" />. I've added the following line into "Page_Load" method: System.Diagnostics.Debug.WriteLine("Page_Load"); When I launched web-site in 'debug' mode (using F5 button) It put me 'Page_Load' into output window. Everything is ok so far. When I change application compilation mode into non-debug: Will it recompile everything for 'non-debug' mode? Is this enough to go into "production" environment with this change only? I guess, it should be enough for web-site that doesn't use other project. Otherwise, I would better switch whole configuration into "Release" mode. In this case EACH project will be recompiled in "Release" mode. Am I right? Could you please point me if something is wrong here? Thanks a lot!

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• Web Control added in .master control type not found in child page

  - by turtle

  I have a Web Site project, and within it I have a user Web Control defined in an ascx file. The control is added to the Site.Master, and it shows up correctly on the page and everything is fine. I need to override some of the control's fields on one of the pages that derive from Site.Master. // In OnLoad: MyControlName control = (MyControlName) Page.Master.GetBaseMasterPage().FindControl("controlID")); The issue is that MyControlName doesn't register as a valid Type on the child page. If I add a second instance of the control to the child page directly, the above works as needed, but if the control isn't placed directly on the page, and instead is only defined in the master page, the type is undefined. The control is not in a namespace, and is defined within the project, so I don't know why it is having such an issue location the appropriate type. If I put a breakpoint in the OnLoad, the type listed for the control is ASP.my_control_name_ascx, but using that does not work either. Why can't the child class reference the correct type? Can I fix this? Thanks!

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• R Tree 50,000 foot overview?

  - by roufamatic

  I'm working on a school project that involves taking a lat/long point and finding the top five closest points in a known list of places. The list is to be stored in memory, with the caveat that we must choose an "appropriate data structure" -- that is, we cannot simply store all the places in an array and compare distances one-by-one in a linear fashion. The teacher suggested grouping the place data by US State to prevent calculating the distance for places that are obviously too far away. I think I can do better. From my research online it seems like an R-Tree or one of its variants might be a neat solution. Unfortunately, that sentence is as far as I've gotten with understanding the actual technique, as the literature is simply too dense for my non-academic head. Can somebody give me a really high overview of what the process is for populating an R-Tree with lat/long data, and then traversing the tree to find those 5 nearest neighbors of a given point? Additionally the project is in C, and I don't have to reinvent the wheel on this, so if you've used an existing open source C implementation of an R Tree I'd be interested in your experiences.

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