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• All my UIButtons and UITableRowViews are now gray

  - by Greg Maletic

  Not sure how this happened, but all of the UITableRowViews and roundrect-style UIButtons in my app—spanning a dozen or so views—are now all gray instead of white. Unfortunately, I have no idea how this happened. (In fact, I had no idea it was possible to do this.) Explicitly setting the button's or tableRowView's background color to white gets it back to normal. But it'll be a lot of work to do that to every one of my views...and I'd rather not have to do it since there's obviously something simple that caused it in the first place. How did I break this? Thanks very much.

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• Is it possible to calculate distance on GeoDjango in a SELECT statement?

  - by alex

  I am using MYSQL. I have a table with 1 column, a Point field. I want to SELECT all rows that have a point with a distance less than 50 meters of my given point. Simple enough, right? Below is how it's done in RAW SQL. But of course, I want to use GeoDjango to do this. cursor.execute("SELECT * FROM project_location WHERE\ (GLength(LineStringFromWKB(LineString(asbinary(utm), asbinary(PointFromWKB(point(%s, %s)))))) < 50)\

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• Should I put my output files in source control?

  - by sebastiaan

  I've been asked to put every single file in my project under source control, including the database file (not the schema, the complete file). This seems wrong to me, but I can't explain it. Every resource I find about source control tells me not to put generated output files in a source control system. And I understand, it's not "source" files. However, I've been presented with the following reasoning: Who cares? We have plenty of bandwidth. I don't mind having to resolve a conflict each time I get the latest revision, it's just one click It's so much more convenient than having to think about good ignore files Also, if I have to add an external DLL file in the bin folder now, I can't forget to put it in source control, as the bin folder is not being ignored now. The simple solution for the last bullet-point is to add the file in a libraries folder and reference it from the project. Please explain if and why putting generated output files under source control is wrong.

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• Load XML to DataFrame in R

  - by Rohit Kandhal

  I am new to R programming and trying to load a simple XML in RStudio. I tried using XMLToDataFrame but got this error XML content does not seem to be XML: 'temp.xml' XML Schema <root> <row Id="1" UserId="1" Name="Rohit" Date="2009-06-29T10:28:58.013" /> <row Id="2" UserId="3" Name="Rohit" Date="2009-06-29T10:28:58.030" /> </root> Please provide me some direction on which function I should use here.

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• Perl Catalyst -- Is this helpful to use for images/graphs display

  - by Octopus

  I have simple perl/cgi scripts based web server which is mainly used to display graphs and Images. I am looking to make it more technical and come to know about Catalyst. I have installed all the required perl modules on my test platform and created an application called myweb. Also, I am going through the catalyst documents to reach my goal but nothing helpful yet. Is Catalyst helpful to display images/graphs on web? How to use my existing cgi/perl scritps with Catalyst? Any example would be really appreciated.

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• Sudoku solver evaluation function

  - by Rich

  Hi, So I'm trying to write a simple genetic algorithm for solving a sudoku (not the most efficient way, I know, but it's just to practice evolutionary algorithms). I'm having some problems coming up with an efficient evaluation function to test if the puzzle is solved or not and how many errors there are. My first instinct would be to check if each row and column of the matrix (doing it in octave, which is similar to matlab) have unique elements by ordering them, checking for duplicates and then putting them back the way they were, which seems long winded. Any thoughts? Sorry if this has been asked before...

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• How to treat an instance variable as an instance of another type in C#

  - by Ben Aston

  I have a simple inheritance heirarchy with MyType2 inheriting from MyType1. I have an instance of MyType1, arg, passed in as an argument to a method. If arg is an instance of MyType2, then I'd like to perform some logic, transforming the instance. My code looks something like the code below. Having to create a new local variable b feels inelegant - is there a way of achieving the same behavior without the additional local variable? public MyType1 MyMethod(MyType1 arg) { if(arg is MyType2) { MyType2 b = arg as MyType2; //use b (which modifies "arg" as "b" is a reference to it)... } return arg; }

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• How to get the client ip address in ASP.Net MVC?

  - by melaos

  hi guys, i'm totally new to the asp.net mvc stack and i was wondering what happened to the simple Page object and the Request ServerVariables object? basically what i wanted to do is to pull out the client's pc ip address. but i fail to understand how the current MVC structure has changed all of this. as far as i can understand, most of the variable object has been replaced by the HttpRequest variants? anybody care to share some resources? really a sea of stuff to learn in the asp.net mvc world :) thanks.

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• Help with making a C# P2P Chat Program

  - by Sandeep Bansal

  Hi everyone, I want to make a P2P Chat client, all I want it to do is to be able to send text across to each peer. I looked at a Chat Client from this example: http://www.geekpedia.com/tutorial239_Csharp-Chat-Part-1---Building-the-Chat-Client.html And am wondering if it can be converted to a p2p program? If so how can it be and can someone provide some code as it will help a lot. If it can't how can I make a really simple p2p chat program? Codes and examples will be very helpful. btw I did look at this article, but it didn't help me: http://msdn.microsoft.com/en-us/library/ms751502.aspx

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• Embedded Prolog Interpreter/Compiler for Java

  - by Sami

  I'm working on an application in Java, that needs to do some complex logic rule deductions as part of its functionality. I'd like to code my logic deductions in Prolog or some other logic/constraint programming language, instead of Java, as I believe the resulting code will be significantly simpler and more maintainable. I Googled for embedded Java implementations on Prolog, and found number of them, each with very little documentation. My (modest) selection criteria are: should be embeddable in Java (e.g. can be bundled up with my java package instead of requiring any native installations on external programs) simple interface to use from Java (for initiating deductions, inspecting results, and adding rules) come with at least a few examples on how to use it doesn't necessarely have to be Prolog, but other logic/constraint programming languages with the above criteria would suit my needs, too. What choices do I have and what are their advantages and disadvantages?

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• Does Extreme Programming Need Diagramming Tools?

  - by Ygam

  I have been experimenting with some concepts from XP, like the following: Pair Programming Test First Programming Incremental Deliveries Ruthless Refactoring So far so good until I had a major stump: How do I design my test cases when there aren't any code yet? From what basis do I have to design them? From simple assumptions? From the initial requirements? Or is this where UML diagrams and the "analysis phase" fits in? Just had to ask because in some XP books I've read, there was little to no discussion of any diagramming tool (there was one which suggested I come up with pseudocodes and some sort of a flowchart...but it did not help me in writing my tests)

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• java regex illegal escape character error not occurring from command line arguments

  - by Shades88

  This simple regex program import java.util.regex.*; class Regex { public static void main(String [] args) { System.out.println(args[0]); // #1 Pattern p = Pattern.compile(args[0]); // #2 Matcher m = p.matcher(args[1]); boolean b = false; while(b = m.find()) { System.out.println(m.start()+" "+m.group()); } } } invoked by java regex "\d" "sfdd1" compiles and runs fine. But if #1 is replaced by Pattern p = Pattern.compile("\d");, it gives compiler error saying illegal escape character. In #1 I also tried printing the pattern specified in the command line arguments. It prints \d, which means it is just getting replaced by \d in #2. So then why won't it throw any exception? At the end it's string argument that Pattern.compile() is taking, doesn't it detect illegal escape character then? Can someone please explain why is this behaviour?

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• Is there an extensible SQL like query language that is safe for exposing via a public API?

  - by Lokkju

  I want to expose some spatial (and a few non-spatial) datasets via a public API. The backend store will either be PostgreSQL/PostGIS, sqlite/spatialite, or CouchDB/GeoCouch. My goal is to find a some, preferably standard, way to allow people to make complex spatial queries against the data. I would like it to be a simple GET based request. The idea is to allow safe SQL type queries, without allowing unsafe ones. I would rather modify something that is off the shelf than doing the entire thing myself. I specifically want to support requesting specific fields from a table; joining results; and spatial functions that are already implemented by the underlying datastore. Ideas anyone?

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• TypeInitializationException When Getting an NHibernate Session

  - by Paul Johnson

  I’ve run into what appears to be an NHibernate config problem. Basically, I ran up a simple proof of concept persistence integration test using NUnit, the test simply querys an Oracle database and successfully returns the last record received by the underlying table. However, when the assemblies are taken out of the NUnit test environment and deployed as they would be for an actual application build, my call for an NHibernate session results in a ‘TypeInitializationException’ whilst executing the code line: sessionFactory = New Configuration().Configure().BuildSessionFactory() The application is a vb.net console app running against an Oracle 9.2 database, using a ‘coding framework’ published on the web by Bill McCafferty entitled 'NHibernate Best Practices with ASP.NET' (pre S#harp Architecture). I am running version 2.1.2.4000 of NHibernate. Any assistance much appreciated. Kind Regards Paul J.

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• Integrate Weld CDI into a JSF 1.2 EJB Application on jboss 6 AS

  - by ich-bin-drin

  Hi, since two evenings i am trying to integrate weld CDI into an EJB 3.1 Application with JSF 1.2. I simply tried to call a with @Named annotated controller in an JSF page. The problem is, that no exception is thrown, when i deploy the project and also no exception is thrown when i call the page. The simple example contains only: The Controller: import javax.inject.Named; @Named public class HelloWorldController { public HelloWorldController(){ System.out.println("Hello World!"); } public String getMessage() { return "Hello Weld World"; } } And it's call: <h1><h:outputText value="#{helloWorldController.message}" /></h1> THX

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• Crystal Reports Formula Workshop boolean condition to string

  - by Jay

  Hello, I'm currently trying to create a report using Crystal Reports that comes with Visual Studio 2008. I would like to include a field of type boolean on my report that shows a string rather than true or false. The string should contain either contain a € or a % sign. How would I go about doing this in the Formula Workshop? I've tried things like e.g. if {tblAankoopDetails.SoortKorting} = true then "€" else "%" However this never seems to work and results in warnings such as "The formula result must be a number". This should be fairly simple but this is my first go at using Crystal Reports. Help would be much appreciated. Jay

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• Additional/Optional query string parameters in URI Template in WCF

  - by Rajesh Kumar

  I have written a simple REST Service in WCF in which I have created 2 method using same URI Template but with different Method(POST and GET). For GET method I am also sending additional query parameters as follows: [WebInvoke(Method = "POST", UriTemplate = "users")] [OperationContract] public bool CreateUserAccount(User user) { //do something return restult; } [WebGet(UriTemplate = "users?userid={userid}&username={userName}")] [OperationContract] public User GetUser(int userid, string userName) { // if User ID then // Get User By UserID //else if User Name then // Get User By User Name //if no paramter then do something } when I call CreateUserAccount with method POST it is working fine but when I call GetUser method using GET and sending only one query string parameter(userID or UserName) it is giving error "HTTP Method not allowed" but if send both parameters its wokrs fine. Can anyone help me?

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• A method to change effective user id of a running program?

  - by Brendan Long

  I'm writing a simple package manager and I'd like to automatically try sudo if the program isn't run as root. I found a function called seteuid, which looks likes it's exactly what I need, but I don't have the permissions to run it. So far all I can think of is a bash script to check before they get to the actual binary, but I'd like to do this all as C++ if possible. Is there any method of changing a processes's euid after it starts executing? Or a way to call sudo?

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• Boost::Asio : io_service.run() vs poll() or how do I integrate boost::asio in mainloop

  - by user300713

  Hi, I am currently trying to use boost::asio for some simple tcp networking for the first time, and I allready came across something I am not really sure how to deal with. As far as I understand io_service.run() method is basically a loop which runs until there is nothing more left to do, which means it will run until I release my little server object. Since I allready got some sort of mainloop set up, I would rather like tp update the networking loop manually from there just for the sake of simplicity, and I think io_service.poll() would do what I want, sort of like this: void myApplication::update() { myIoService.poll(); //do other stuff } This seems to work, but I am still wondering if there is a drawback from this method since that does not seem to be the common way to deal with boost::asios io services. Is this a valid approach or should I rather use io_service.run() in a non blocking extra thread?

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• Java binary files writeUTF... explain specifications...

  - by user69514

  I'm studying Java on my own. One of the exercises is the following, however I do not really understand what it is asking to.... any smart java gurus out there that could explain this in more detail and simple words? Thanks Suppose that you have a binary file that contains numbers whos type is either int or double. You dont know the order of the numbers in the file, but their order is recorded in a string at the begining of the file. The string is composed of the letters i for int, and d for double, in the order of the types of the subsequent numbers. The string is written using the method writeUTF. For example the string "iddiiddd" indicated that the file contains eight values, as follows: one integer, followed by two doubles, followed by two integers, followed by three doubles. Read this binary file and create a new text file of the values written one to a line.

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• Continous integration with .net and svn

  - by stiank81

  We're currently not applying the automated building and testing of continous integration in our project. We haven't bothered this far as we're only 2 developers working on it, but even with a team of 2 I still think it would be valuable to use continous integration and get a confirmation that our builds don't break or tests start failing. We're using .Net with C# and WPF. We have created Python-scripts for building the application - using MSbuild - and for running all tests. Our source is in SVN. What would be the best approach to apply continous integration with this setup? What tool should we get? It should be one which doesn't require alot of setup. Simple procedures to get started and little maintanance is a must.

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• Javascript calling JSF handler method

  - by msharma

  Hi All, I am reading an xml file using javascript and then I need to submit my form so that it calls a particular method in my JSF handler. Usually this can be done on a jsp when user clicks a button by having an actionlistener like so: <h:commandLink styleClass="button" action="#{myHandler.outcome}" actionListener="#{myHandler.doNext}"> <span><h:outputText value="#{text.button_submit}" /></span> </h:commandLink> I am not sure how to call a method like 'doNext' above in the handler from javascript. I cannot do a simple: document.form.submit(); as it then repeats the processing i have already done. I want to read values from an xml file and then call a particular method in handler. Any ideas much appreciated.

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• Entity framework and many to many queries unusable?

  - by John Landheer

  I'm trying EF out and I do a lot of filtering based on many to many relationships. For instance I have persons, locations and a personlocation table to link the two. I also have a role and personrole table. EDIT: Tables: Person (personid, name) Personlocation (personid, locationid) Location (locationid, description) Personrole (personid, roleid) Role (roleid, description) EF will give me persons, roles and location entities. EDIT: Since EF will NOT generate the personlocation and personrole entity types, they cannot be used in the query. How do I create a query to give me all the persons of a given location with a given role? In SQL the query would be select p.* from persons as p join personlocations as pl on p.personid=pl.personid join locations as l on pl.locationid=l.locationid join personroles as pr on p.personid=pr.personid join roles as r on pr.roleid=r.roleid where r.description='Student' and l.description='Amsterdam' I've looked, but I can't seem to find a simple solution.

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• HttpWebRequest is extremely slow!

  - by Earlz

  Hello, I am using an open source library to connect to my webserver. I was concerned that the webserver was going extremely slow and then I tried doing a simple test in Ruby and I got these results Ruby program: 2.11seconds for 100 HTTP GETs C# library: 20.81seconds for 100 HTTP GETs I have profiled and found the problem to be this function: private HttpWebResponse GetRawResponse(HttpWebRequest request) { HttpWebResponse raw = null; try { raw = (HttpWebResponse)request.GetResponse(); //This line! } catch (WebException ex) { if (ex.Response is HttpWebResponse) { raw = ex.Response as HttpWebResponse; } } return raw; } The marked line is takes over 1 second to complete by itself while the ruby program making 1 request takes .3 seconds. I am also doing all of these tests on 127.0.0.1, so network bandwidth is not an issue. What could be causing this huge slow down?

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• displaying keyboard raises memory... but it never comes down iPhone

  - by Joshep Freeman

  Hello again. I encountered a weird behavior in memory just by displaying the default keyboard. I've just created a project with an .xib file for testing purposes. This .xib file has an UITextField element in it and it's connected in the .h via: @property(nonatomic, retain) IBOutlet UITextField *sometext; The .m has no changes but: - (void)viewDidAppear:(BOOL)animated { [someText becomeFirstResponder]; } As you see it's very very simple. The problem is that once the keyboard is shown, the memory allocated for it NEVER goes down. I've tested this scenario in another project with the only difference of having two .xib files. Standar pushViewController and popViewController calls are made. Instruments show an increase of 600kb in memory allocations [which are a lot more in the actual iPhone device]. All in all, hehehe. My question is: How do I release the memory allocated for the keyboard?.

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