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Articles indexed Friday April 16 2010

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• Proper way of naming your Java Google App Engine Project

  - by Saif Bechan

  I am starting out with Google's App Engine in Java. I have seen the tutorial video but I do not understand the naming of the project package. It is going to be a guestbook, that's why the name is guestbook, I understand that part. But after that I see package name. 1)Is that something you import into the project, or is is something you create. I have seen this a lot in projects, something like com.xxx.xxx. 2)How do you name this type of thing or is this an import. I have looked at another tutorial there they take the naming to a whole new level. The name of both the project and the package is de.vogella.gae.java.todo. 3)What does this mean in java terms. 4)Maybe one of you can help me with this specific project I want to start. I want to create a Google App project that for now only serves static files. I will leave the project empty and just put all my static files in the war directory of the project. I want the domain name to be mydomainstatic

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• eclipseFP2 haskell unix haveing issues connectiong to Scion Server

  - by Chris

  I am having troubles with using FP2 for eclipse and getting it to connect with the server. Eclipse seems to auto-detect scion_server, but I a error in the log file !ENTRY net.sf.eclipsefp.haskell.scion.client 4 4 2010-04-15 10:40:06.580 !MESSAGE The connection with the Scion server could not be established. !STACK 0 The connection with the Scion server could not be established. at net.sf.eclipsefp.haskell.scion.internal.client.ScionServer.connectToServer(ScionServer.java:328) at net.sf.eclipsefp.haskell.scion.internal.client.ScionServer.startServer(ScionServer.java:73) at net.sf.eclipsefp.haskell.scion.client.ScionInstance.start(ScionInstance.java:94) at net.sf.eclipsefp.haskell.scion.client.ScionInstance.runCommandSync(ScionInstance.java:207) at net.sf.eclipsefp.haskell.scion.internal.commands.ScionCommand.run(ScionCommand.java:136) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:55) Caused by: java.net.ConnectException: Connection refused at java.net.PlainSocketImpl.socketConnect(Native Method) at java.net.PlainSocketImpl.doConnect(Unknown Source) at java.net.PlainSocketImpl.connectToAddress(Unknown Source) at java.net.PlainSocketImpl.connect(Unknown Source) at java.net.SocksSocketImpl.connect(Unknown Source) at java.net.Socket.connect(Unknown Source) at java.net.Socket.connect(Unknown Source) at java.net.Socket.<init>(Unknown Source) at java.net.Socket.<init>(Unknown Source) at net.sf.eclipsefp.haskell.scion.internal.client.ScionServer.connectToServer(ScionServer.java:345) at net.sf.eclipsefp.haskell.scion.internal.client.ScionServer.connectToServer(ScionServer.java:324)

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• Automate processes upon booting

  - by hERRy

  i need to have amazon ec2 server running some programs upon booting. i need it to be automatically because it is the python script that should start the instance

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• How to move a Mercurial repository created on a local PC to a web server?

  - by Tim Murphy

  I have created and committed to Mercurial repository that was created on my local drive. I now have a remote Windows 2003 web server setup to serve repositories via hgwebdir.cgi. How do I move the locally created repository to the web server? It looks like an ftp of the .hg folder on the local drive to the remote web server does the trick. Am I doing it the right way. Is there a more efficient way?

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• How do I pass a const reference in C#?

  - by Maciek

  In C++, passing const references is a common practice - for instance : #include <iostream> using namespace std; class X { public : X() {m_x = 0; } X(const int & x) {m_x = x; } X(const X & other) { *this = other; } X & operator = (const X & other) { m_x = other.m_x; return *this; } void print() { cout << m_x << endl; } private : int m_x; }; void main() { X x1(5); X x2(4); X x3(x2); x2 = x1; x1.print(); x2.print(); x3.print(); } This very simple example illustrates how it's done - pretty much. However I've noticed that in C# this doesn't seem to be the case. Do I have to pass const references in C# ? what do I need the "ref" keyword for? Please note that I know and understand what C# reference and value types are.

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• What is the most difficult type of software to write?

  - by Austin

  This question just really interested me, so I got curious to know what the community thinks. What do you guys think is the most difficult type of software to write? I write government software and have found it's pretty hair-pulling, but I'm sure there are far worse things out there.

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• Global State and Singletons Dependency injection

  - by Manu

  this is a problem i face lot of times when i am designing a new app i'll use a sample problem to explain this think i am writing simple game.so i want to hold a list of players. i have few options.. 1.use a static field in some class private static ArrayList<Player> players = new ArrayList<Integer>(); public Player getPlayer(int i){ return players.get(i); } but this a global state 2.or i can use a singleton class PlayerList{ private PlayerList instance; private PlayerList(){...} public PlayerList getInstance() { if(instance==null){ ... } return instance; } } but this is bad because it's a singleton 3.Dependency injection class Game { private PlayerList playerList; public Game(PlayerList list) { this.list = list; } public PlayerList getPlayerList() { return playerList; } } this seems good but it's not, if any object outside Game need to look at PlayerList (which is the usual case) i have to use one of the above methods to make the Game class available globally. so I just add another layer to the problem. didn't actually solve anything. what is the optimum solution ? (currently i use Singleton approach)

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• Choosing between assembler and COBOL

  - by Azares Cob

  I have to rewrite and greatly modify parts of a legacy COBOL application. The COBOL source-code is available (around 100.000 lines of copy & pasted code mixed with GOTOs). Some more details on the system: It is a general management system controlling transactions, bank management, customer data and employees of the company I work for. The COBOL-powered database is about 4 Terabytes distributed over 50 old HDDs. (But messing around with them is the sysadmins job) They are using COBOL85 only. Now I have two options: Rewrite and refactor 50% of the old COBOL system, or use X86 assembly. Should I use X86 assembler or COBOL?

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• Problem exporting RSA key -'key not valid for use in specified state'

  - by asp316

  I'm encrypting the web.config in our web sites using aspnet_regiis. However, I want the ability to export the encryption key so if we need to move from Machine A to Machine B, asp.net will be able to decrypt it. When I run aspnetregiis -px "NetFrameworkConfigurationKey" c:\keys.xml -pri, I get the following : 'Key not valid for use in specified state'. I've seen all kinds of responses online but they don't seem to apply. It's not an invalid key because when I use aspnet_regiis to encrypt sections of the web.config, they encrypt fine. Ideas?

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• How to tell Size of a Grid Cell?

  - by beaudetious

  I have a custom control that I've placed inside a cell of a grid. I have some internal calculations I need to run based on the height and width of the custom control. However, I want it to resize based on the size of the cell. So, my main question is... how to I programatically determine the height and width of a given cell?

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• Is recursion generally considered to be an outdated method of traversing compared to using a stack?

  - by Jamie Dixon

  I've been reading in a couple of places where people are opting to use a Stack instead of recursion. Is this because recursion is seen as being an outdated way to get-the-job-done or are both methods equally applicable in different contexts?

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• How to unit test control library?

  - by bughunter

  I program simple control library that checks user input from text and format the input.I want to make a unit test.How can I do that ?

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• IIS 7.5 Custom HTTP Response Headers Not Working

  - by Craig

  Trying to setup custom HTTP Response Headers on a new install of IIS7.5 on Windows Server 2008 R2 Standard and they are not working. Default headers work fine (X-Powered-By, etc...). Modifying default header values work (ie. change X-Powered-By to ASP.NET2). Modifying default header names cause header to stop being output (ie. Change X-Powered-By to X-Powered-By2). Site in question is a test site with a single html page. Custom headers also don't work on ASP.NET 2.0 site. I've tried setting the headers at the global level and at the site level to no effect.

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• Make Firefox left-click open in current tab, and middle-click open in new tab

  - by endolith

  I'm sick of the inconsistent behavior of clicking on links in Firefox. I want control of where they open up. If I'm done with a page and want to replace it with the link I am clicking, I left-click. If there are things I want to look at in the future, but I'm not done with this page yet, I'll middle-click. This normally works, but there are exceptions. If the website designer uses target="_blank", my left-click is overridden and the link opens in a new tab/window. If the links are javascript, a middle-click rarely works. I get an (Untitled) tab with some javascript as the URL. etc. How do I fix these things and get consistent clicking on links?

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• how do i install mod_wsgi2.6 in ubuntu

  - by subhransu

  I am getting problem while installing mod_wsgi 2.6 which supports python2.5 but i have python 2.6 as default in ubuntu. can you plz tell me whether i have to find a mod_wsgi V supporting python2.6 or i have to install python 2.5 and set the path.

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• A list of games made for Mac computers

  - by Chris

  Hi all, Wondering if we could build a list of games that have been released for play natively on Mac OS X 10.x Intel! One game per reply, please

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• L'iPad tente déjà de rattraper Android en terme de trafic internet, mais l'OS mobile de Google résis

  Mise à jour du 16/04/10 L'iPad génère déjà autant de trafic internet que BlackBerry Et tente de rattraper Android, mais l'OS de Google résiste Selon les mesures de NetApplications, l'iPad aurait déjà rejoint (voire dépassé) les smartphones de Blackberry. La tablette serait même sur le point de talonner le score des téléphones embarquant Android comme système d'exploitation. L'iPad représenterait en effet aux alentours de 0,04 % du trafic internet global. Un chiffre à comparer avec les 0,04 % de RIM (l'OS des Blackberry) et à mettre en perspective avec les 0,07 % d'Android (l'OS mobile de Google). Rappelons que l...

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• What could possibly be different between the table in a DataContext and an IQueryable<Table> when do

  - by Nate Bross

  I have a table, where I need to do a case insensitive search on a text field. If I run this query in LinqPad directly on my database, it works as expected Table.Where(tbl => tbl.Title.Contains("StringWithAnyCase") In my application, I've got a repository which exposes IQueryable objects which does some initial filtering and it looks like this var dc = new MyDataContext(); public IQueryable<Table> GetAllTables() { var ret = dc.Tables.Where(t => t.IsActive == true); return ret; } In the controller (its an MVC app) I use code like this in an attempt to mimic the LinqPad query: var rpo = new RepositoryOfTable(); var tables = rpo.GetAllTables(); // for some reason, this does a CASE SENSITIVE search which is NOT what I want. tables = tables.Where(tbl => tbl.Title.Contains("StringWithAnyCase"); return View(tables); The column is defiend as an nvarchar(50) in SQL Server 2008. Any help or guidance is greatly appreciated!

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• C# Windows Service Intermittent Method Call

  - by Goober

  Scenario I have a C# Windows Service that essentially subscribes to some events and if anything is triggered by the events, it carries out a few tasks. The Thing... ....is that these events are monitoring processes, which I need to restart at certain times of the day. Question What's the best way I can go about performing this task at an exact time? Thoughts so far are: 1)To use a timer that checks what time it is every few minutes. 2)Something that isn't a timer and doesn't suck as an implementation. Help greatly appreciated.

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• Conversion failed when converting the varchar value to data type int

  - by desi

  *I have a varchar(1000) column declared as field that contains all numbers, as shown below. And I want to execute the following script. I need this to work please Declare @PostalCode varchar(1000)=0 set @PostalCode ='7005036,7004168,7002314,7001188,6998955' Select hl.* From CountryLocation cl INNER JOIN refPostalCodes pc ON pc.PostalCode = hl.PostalCode where pc.Postalcode in (@PostalCode) and pc.notDeleted = 1

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• How can char* be a condition in for loop?

  - by Jackie

  In a book I am reading there is a piece of code : string x; size_t h=0; for(const char* s=x.ctr();*s;++s) h=(h*17)^*s; Regarding this code, I have two questions: how can *s be a condition? what does it mean? what does "h=(h*17)^*s" mean? Thanks for help!

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• Detect backspace in UITextField

  - by marcc

  Is there any way to detect when the backspace/delete key is pressed in the iPhone keyboard on a UITextField that is empty? I want to know when backspace is pressed only if the UITextField is empty. Based on the suggestion from @Alex Reynolds in a comment, I've added the following code while creating my text field: [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(handleTextFieldChanged:) name:UITextFieldTextDidChangeNotification object:searchTextField]; This notification is received (handleTextFieldChanged function is called), but still not when I press the backspace key in an empty field. Any ideas? There seems to be some confusion around this question. I want to receive a notification when the backspace key is pressed. That's it. But the solution must also work when the UITextField is already empty.

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• I make this for balancing paranthesis of equation but i think it is wrong check and correct it

  - by muhammadlodhi

  int main(){ char i,input[30],close,open; for(i=0;i<='.';i++){ printf("enter equation"); scanf("%c",input[i]); if(input[i]=='(') input++; input[i]=open; else if(input[i]==')') input[i]--; input[i]=close; else if(open[i]==close[i]) { printf("paranthesis are balance"); } else printf("paranthesis are not balance"); } getch(); return 0; }

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• What real life good habits has programming given you?

  - by Luca

  Following this question, what real life good habits has programming given you?

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• In VS2010, is there a way to know which application pool a given w3wp.exe is serving, to then decide

  - by Peter Mounce

  So I'm debugging some websites (one from trunk, one from branch) running locally, in separate apppools. I have trunk and branch solutions open in two VS instances. I'd like to debug trunk in one, and branch in the other. I'd like to know if there's a way to know which application pool each w3wp.exe is serving, to know which one is which when attaching the debugger.

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