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• Headers to set for AJAX calls in a custom webserver

  - by ErJab

  I'm writing a custom web server. When I enter the URL of my server in the browser, I get the sample text I write out to the socket in my browser correctly. This is the HTTP response that I write: HTTP/1.1 200 OK\r\n Server: My Server\r\n Date: Blah\r\n \r\n This is some sample text. This appears in my browser correctly when I connect directly to the server entering the URL. However, if I use Ajax (jQuery) to access the same URL and then set the innerHTML of an element on the HTML page, I do not get any data printed. Is there any other header I need to set on my web server so that the browser's XMLHttpRequest object detects the response?

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• device.uuid undefined in PhoneGap on Android?

  - by Steve Nay

  I'm writing a PhoneGap application that sends requests to a central database. It needs to be able to identify the unique devices that connect to it. PhoneGap's device.uuid property would seem to do the trick. On webOS and iPhone, I get back a unique string of alphanumeric characters, which will satisfy my need. However, the Android devices I've tested (Motorola Droid and the Android SDK emulator, both running Android 2.1) return "undefined" as the device.uuid. device.platform and device.name return correct values on all three platforms, so the problem doesn't have to do with the device object itself (it's defined in the code blocks where I use it). Is this an Android limitation? A problem with PhoneGap? Is there any other way to get such a globally unique identifier if not through device.uuid? EDIT: It appears that the deviceready event is never getting fired, which needs to happen before the device.uuid property becomes available.

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• How to write php->mysql queries?

  - by Bluemagica

  Is there any good tutorial that has all the basic rules for writing queries to store $_Post vars from php to mysql? Like when to use backticks and singleqoutes, and how to safely write code with functions like get_magic_quotes_gpc()? Another thing is, assuming there is no javascript validation(since the user can easily turn it off), how should I handle empty form fields being sent as empty $_post variables and throwing errors? Do I have to use isset() call on all the post variables? What is the best way to handle users turning off javascript validation on a form?

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• UITextView autoscroll to last line

  - by MihaiD

  Hi *, When writing in a UITextView more text than can fit entirely inside it, the text will scroll up and the cursor will often place itself one or two lines above the view's bottom line. This is a bit frustrating as I want my application to make good use of the entire height of the text view. Basically what I want is to configure the UITextView to write up to it's lowest part and not use it just for scrolling. I've seen some similar questions here, here and here. However I've not seen a proper solution yet. Thanks

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• JavaScript - get detailed information about the browser

  - by iconiK

  Basically I'm looking for something to give me easy access to information like useragentstring.com, but in JS, without me parsing the user agent and looking for each possible bit of text. The object could be something like this: browser = UserAgent.Browser; // Chrome browserVer = UserAgent.BrowserVersion; // 5.0.342.9 os = UserAgent.OperatingSystem; // Windows NT osVer = UserAgent.OperatingSystemVersion; // 6.1 layoutEng = UserAgent.LayoutEngine; // WebKit layoutEngVer = UserAgent.LayoutEngineVersion; // 533.2 Does something similar to that exist or do I have to write one myself? Writing yet another user agent parser doesn't seem that easy with all those impersonations going back to the dark ages of the web. Specifically I'm looking for something that doesn't just split the user agent into parts and give them to me, because that's as useless as the user agent itself; instead it should parse the user agent and recognize the engine, browser, OS, etc. and return the concrete parts only, as in the example.

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• How to achieve conditional resource import in a Spring XML context?

  - by Boris Terzic

  What I would like to achieve is the ability to "dynamically" (i.e. based on a property defined in a configuration file) enable/disable the importing of a child Spring XML context. I imagine something like: <import condition="some.property.name" resource="some-context.xml"/> Where the property is resolved (to a boolean) and when true the context is imported, otherwise it isn't. Some of my research so far: Writing a custom NamespaceHandler (and related classes) so I can register my own custom element in my own namespace. For example: <myns:import condition="some.property.name" resource="some-context.xml"/> The problem with this approach is that I do not want to replicate the entire resource importing logic from Spring and it isn't obvious to me what I need to delegate to to do this. Overriding DefaultBeanDefinitionDocumentReader to extend the behaviour of the "import" element parsing and interpretation (which happens there in the importBeanDefinitionResource method). However I'm not sure where I can register this extension.

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• Should I suppress CA1062: Validate arguments of public methods?

  - by brickner

  I've recently upgraded my project to Visual Studio 2010 from Visual Studio 2008. In Visual Studio 2008, this Code Analysis rule doesn't exist. Now I'm not sure if I should use this rule or not. I'm building an open source library so it seems important to keep people safe from doing mistakes. However, if all I'm going to do is throw ArgumentNullException when the parameter is null, it seems like writing useless code since ArgumentNullException will be thrown even if I won't write that code. Should I remove that rule or fix the violations?

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• C# Secure Sockets (SSL)

  - by Matthias Vance

  LS, I was planning on writing a wrapper around the System.Net.Sockets.Socket class, because I didn't feel like using the SSLStream class because I wanted to maintain backwards compatibility with other programs. I found an article which does exactly what I want, but on Windows Mobile. (Link: Enable SSL for managed socket on windows mobile) Quote: My first surprise was that SetSocketOption takes a SocketOptionName enum value as the second parameter, but this enum doesn’t have the equivalent of SO_SECURE. However, C# was nice enough to let me cast an arbitrary integer value to the enum I needed. I tried to do the same, but it doesn't work. Code: private const ushort SO_SECURE = 0x2001; private const ushort SO_SEC_SSL = 0x2004; this.SetSocketOption(SocketOptionLevel.Socket, (SocketOptionName) SO_SECURE, SO_SEC_SSL); Error: An unknown, invalid, or unsupported option or level was specified in a getsockopt or setsockopt call Is there a way to work around this? Kind regards, Matthias Vance

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• When querying the Win32_NTLogEvent Class from WMI with WQL is the TimeGenerated property based on Lo

  - by jpmcclung

  I am writing a C# windows service that is doing some churning through the eventlog on a few domain controllers. Some of them are Windows Server 2003 and some are Windows Server 2008. Upon the service stopping I am attempting to resume where I left off in the logs. In order to do this instead of SELECT * FROM Win32_NTLogEvent WHERE --criteria for events I am looking for I am doing SELECT * FROM Win32_NTLogEvent WHERE TimeGenerated = --some date AND --criteria for events I am looking for At one point I was convinced that the TimeGenerated field was in the local time of the server but now it seems that the Windows 2008 Servers are using GMT to record that time. Can anyone shed some light on if this is a real different between the way the two operating systems function or is this a configuration problem?

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• Problem in apache2 with mod rewrite when setting rules in .conf files instead of .htaccess

  - by gonzlikes

  Hi, Because of weird security policies of my hosting provider I have to define my rewrite rules in /etc/apache2/conf.d/examplesite.conf instead of writing them on an .htaccess on the www folder of that site. What I'm trying to do is setup a Wordpress Mu server (http://mu.wordpress.org/forums/topic/17349 ) and so far its working on a 50%. The main blog loads perfectly but other sub blogs (located for example at www.example.com/blog2 ) don't. I'm guessing the problem is that the rewrite rules behave differently when declared at .conf files for each virtual host instead of using .htaccess files. Has anybody else had this problem? How can you fix it?

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• Mac Quick Look Preview in an NSView or NSImage?

  - by Niko Matsakis

  I am looking for a way (public or otherwise) to get an NSView, NSImage, CGImageRef, etc that shows the QuickLook preview for a file. Essentially the equivalent of QLThumbnailImageCreate() but for the preview. The public APIs I can find do not support this. They allow the creation of a thumbnail image or a QLPreviewPanel. The panel does in fact display the quick look preview, but I cannot get access to the preview's appearance to embed it in other views, nor can I display multiple previews at once. For background, I am writing an app where users can embed links to other files that should be displayed inline, kind of like an <img> tag in HTML. For images like JPGs and PDFs it's easy to figure out what to display. I thought that for other formats I would use Quick Look to generate a nice visual representation of the file's contents. This way the set of formats supported by my application would be easily extensible (just download new Quick Look generators).

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• How do the performance characteristics of jQuery selectors differ from those of CSS selectors?

  - by Moss

  I came across Google's Page Speed add-on for Firebug yesterday. The page about using efficient CSS selectors said to not use overqualified selectors, i.e. use #foo instead of div#foo. I thought the latter would be faster but Google's saying otherwise, and who am I to go against that? So that got me wondering if the same applied to jQuery selectors. This page I found the link to on SO says I should use $("div#foo"), which is what I was doing all along, since I thought that things would speed up by limiting the selector to match div elements only. But is it really better than writing $("#foo") like Google's saying for CSS selectors, or do CSS versus jQuery element matching work in different ways and I should stick with $("div#foo")?

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• Asynchronous Html.ImageGetter for setting multiple images in a TextView

  - by thedude19

  I'm writing an application that takes HTML pages and parses them to display on the screen. Specifically, this application pulls HTML from a message board and lists posts made by users. The problem is that a lot of the content in posts are pictures in <img> tags, so I need to write a Html.ImageGetter to handle the downloading of the images. My textView.setText() method will look like this: myTextView.setText(Html.fromHtml(myText, new ImageGetter() { @Override public Drawable getDrawable(String source) { Drawable d; // Need to async download image here return d; } }, null)); Doing this synchronously is trivial, but is there a suggested way to do this asynchronously so that it doesn't lock up my UI thread? I would also like to eventually build in caching of these images, but I imagine that would be pretty simple once the async downloading was there.

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• Android daemon process

  - by J Andy

  Is it possible (without violating any licenses) to write a native C/C++ application on top of the Android OS and make it run as a daemon process? There are already several daemon process' running which one can see with the 'ps' command, the legal part concerns me the most. And also the lack of documentation on how to exactly do this. For the writing part, I guess one could use basic Linux programming concepts, since Android supports at least to some level the standard Posix API. To make it run as the phone boots, some modifications is of course required in init as well. I have no plans to have this app in the Android Market, so installing it manually to the phone is not a problem. As long as it does not require re-compiling the whole OS or kernel. I really appreciate all info on this topic, since there's isn't much available. Thanks.

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• Creating Tables and Retrieving Query results with Dynamics AX 2009 business connector

  - by namenlos

  I'm writing a C# command line tool to fetch data from AX and to add data (create new tables) to AX. Fetching data from an AX table is easy and documented here: http://msdn.microsoft.com/en-us/library/cc197126.aspx Adding data to an existing table is also easy: http://msdn.microsoft.com/en-us/library/aa868997.aspx But I cannot figure out how to do two things: Create a new AX Table Retrieve data from an AX Query Can someone please share some sample code or give some pointers on where to start looking. My searches on Google and MSDN have not revealed much. NOTE: I am not an experienced AX or ERP developer.

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• Ruby on Rails vs Grails vs. Spring ROO vs. Spring App

  - by lizdev

  Hi, I'm planning on writing a simple web application that will be used by lots of users (as complicated as a simple bookmarking app) and I'm trying to decide which framework/language to use. I'm very experienced with Spring/Hibernate and Java in general but new to both Grails and RoR (and Spring ROO). The only reason I'm considering RoR is because Java hosting is MUCH more expensive than RoR hosting (which is supported by almost any hosting vendor for 5$ per month). Assuming the price wasn't an issue, which one of the frameworks/languages mentioned above would you recommend for a Java developer (who knows how to configure Spring/Hibernate etc.)? I'm afraid that by using RoR I won't be able to easily support many users who are using the website at the same time. thanks

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• MVC Authorize Attribute + HttpUnauthorizedResult + FormsAuthentication

  - by Anthony

  After browsing the MVC section on CodePlex I noticed that the [Authorize] attribute in MVC returns a HttpUnauthorizedResult() when authorization fails (codeplex AuthorizeAttribute class). In the source of HttpUnauthorizedResult() from CodePlex is the code (I'm not allowed to enter another URL as my rep isn't high enough, but replace the numbers on the URL above with 22929#266476): // 401 is the HTTP status code for unauthorized access - setting this // will cause the active authentication module to execute its default // unauthorized handler context.HttpContext.Response.StatusCode = 401; In particular, the comment describes the authentication module's default unauthorized handler. I can't seem to find any information on this default unauthorized handler. In particular, I'm not using FormsAuthentication and when authorization fails I get an ugly IIS 401 error page. Does anyone know about this default unauthorized handler, and in particular how FormsAuthentication hooks itself in to override it? I'm writing a really simple app for my football team who confirm or deny whether they can play a particular match. If I enable FormsAuthentication in the web.config the redirect works, but I'm not using FormsAuthentication and I'd like to know if there's a workaround.

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• Problem with cvCreateVideoWriter in OpenCv. Again )

  - by lyuba

  I know, that the issue had been widely discussed before, but after 5 hours of inefficient googling I guess I deserve to ask :) By the way, all such problems concerned earlier versions of OpenCV, so.. I've compiled fresh OpenCV 2.1. from source under Ubuntu 9.10. It works fine except of cvCreateVideoWriter, which returns null to the following request: CvVideoWriter *writer = cvCreateVideoWriter("video.avi", CV_FOURCC('M','J','P','G'), fps, size, 0); I've walked through the OpenCv folders - it even seems to have ffmpeg inside. I've also installed it on the system to make sure. I've changed CV_FOURCC('M','J','P','G') to -1 - all worthless. I would appreciate your help soo much! P.S. I've also explored some new way for writing videos here: http://opencv.willowgarage.com/documentation/cpp/reading_and_writing_images_and_video.html#videowriter But it fails to work as well, showing the mistake: error: no match for ‘operator>>’ in ‘writer >> frame’ My code is here: http://pastie.org/984734

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• object of type 'closure' is not subsettable - contradiction?

  - by Alex

  I'm writing a function to produce time series plots of stock prices. However, I'm getting the following error "Error in df[, 7] : object of type 'closure' is not subsettable" Here's an example of the function: plot.prices <- function(df) { require(ggplot2) g <- ggplot(df, aes(x= as.Date(Date, format= "%Y-%m-%d"), y= df[, 7])) + geom_point(size=1) # ... code not shown... g } And example data: spy <- read.csv(file= 'http://ichart.finance.yahoo.com/table.csv?s=SPY&d=11&e=1&f=2012&g=d&a=0&b=29&c=1993&ignore=.csv', header= T) plot.prices(spy) # produces error ggplot(spy, aes(x= as.Date(Date, format= "%Y-%m-%d"), y= spy[, 7])) + geom_point(size=1) ## does not produce error As you can see, the code is identical. I get an error if the call to ggplot() is INSIDE the function but not if the call to ggplot() is OUTSIDE the function. Anyone have any idea why the seeming contradiction?

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• Blackberry support for Forms Authentication - ASP.NET MVC app

  - by Derek Mitchell

  I'm writing an ASP.NET MVC application that uses Forms Authentication. The target clients are a variety of mobile web browsers. When I use the BlackBerry 8530 simulator my MVC app authenticates as expected. I can visit pages whose controller methods are decorated with the [Authorize] attribute - no problem - they display and therefore I assume my Forms Authentication is working correctly. Using a physical Windows Mobile device to browse my site, I have the same experience as the BB simulator, the forms authentication works as I would expect. BUT when I try to visit the site using a Blackberry 8900 physical device the Login page keeps on looping back when I click the Login page. The device is not retaining it's "authenticated" status. I added code to verify this and I can see that: Request.IsAuthenticated: False User.Identity.IsAuthenticated: False So my question is what next steps can I take to try and find out why the Blackberry 8900 is losing it's authentication status. Is this cookie related? Anyone have any ideas? Cheers Derek

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• Chaining multiple MapReduce jobs in Hadoop.

  - by Niels Basjes

  In many real-life situations where you apply MapReduce, the final algorithms end up being several MapReduce steps. I.e. Map1 , Reduce1 , Map2 , Reduce2 , etc. So you have the output from the last reduce that is needed as the input for the next map. The intermediate data is something you (in general) do not want to keep once the pipeline has been successfully completed. Also because this intermediate data is in general some data structure (like a 'map' or a 'set') you don't want to put too much effort in writing and reading these key-value pairs. What is the recommended way of doing that in Hadoop? Is there a (simple) example that shows how to handle this intermediate data in the correct way, including the cleanup afterward? Thanks.

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• How to list all (groovy) classes in JVM in groovy

  - by Dan

  I am writing a DelegatingMetaClass that I would like to apply to all groovy classes in my project, but I do not how to get hold of all classes in the project? Here is the code: /* This will work ok, since I know Foo beforehand, but what about classes that do not exist yet? */ def myMetaClass = new DelegatingMetaClass(Foo.class) InvokerHelper.metaRegistry.setMetaClass(Foo.class, myMetaClass) /* how to do this? allGroovyClasses.each{ def myMetaClass = new DelegatingMetaClass(it) InvokerHelper.metaRegistry.setMetaClass(it, myMetaClass) } */ class SimpleInterceptor extends DelegatingMetaClass{ public SimpleInterceptor(final Class aclass) { super(aclass); initialize(); } public Object getProperty(Object object, String prop) { println ("I am in a property interceptor!!!") return super.getProperty(object, prop) } public Object invokeMethod(Object a_object, String a_methodName, Object[] a_arguments) { println ("I am in a method interceptor!!!") return super.invokeMethod(a_object, a_methodName, a_arguments) }

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• Minimax algorithm: Cost/evaluation function?

  - by Dave

  Hi guys, A school project has me writing a Date game in C++ (example at http://www.cut-the-knot.org/Curriculum/Games/Date.shtml) where the computer player must implement a Minimax algorithm with alpha-beta pruning. Thus far, I understand what the goal is behind the algorithm in terms of maximizing potential gains while assuming the opponent will minify them. However, none of the resources I read helped me understand how to design the evaluation function the minimax bases all it's decisions on. All the examples have had arbitrary numbers assigned to the leaf nodes, however, I need to actually assign meaningful values to those nodes. Intuition tells me it'd be something like +1 for a win leaf node, and -1 for a loss, but how do intermediate nodes evaluate? Any help would be most appreciated.

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• Better Flex memory profiling tools

  - by verveguy

  Does anyone know of any better tools that the Flex Builder Profiler? I've googled and googled to no avail. While the FB tools are OK for small apps / small leak situations, they're nowhere near adequate for wading through the thicket of object references that can arise in a large scale Flex app (that is leaking memory heavily). In particular, any reasonably complex view structure ends up with huge numbers of parent/child object references to the top level view - none of which are at all relevant to finding the one or two refs from outside the parent child subgraph that are causing the whole bolus to be non-GC'able. If no one has any better suggestions, I'm seriously considering writing a tool to parse the saved profile dumps that Flex Builder can generate so that I can do my own "graph pruning" to find the important refs. If I go this route, collaboration would be welcome!

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• Best way to detect integer overflow in C/C++

  - by Chris Johnson

  I was writing a program in C++ to find all solutions of a^b = c (a to the power of b), where a, b and c together use all the digits 0-9 exactly once. The program looped over values of a and b, and ran a digit-counting routine each time on a, b and a^b to check if the digits condition was satisfied. However, spurious solutions can be generated when a^b overflows the integer limit. I ended up checking for this using code like: unsigned long b, c, c_test; ... c_test=c*b; // Possible overflow if (c_test/b != c) {/* There has been an overflow*/} else c=c_test; // No overflow Is there a better way of testing for overflow? I know that some chips have an internal flag that is set when overflow occurs, but I've never seen it accessed through C or C++.

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