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• NSTask or NSThread?

  - by Ben Packard

  I have some code that is attached to an NSTimer. Around 5 times every second, it interacts with another application (by emulating keystrokes) and when appropriate spits out an NSNotification, that is handled by another piece of code. While the timer code is running, the UI is unresponsive, so I can't include a 'stop' button that halts the timer. How should I handle this? A separate process (NSTask right?) or thread? Remember that at unpredictable times, the timer code will need to send some info back for processing. Thanks.

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• Which is faster in Python: x**.5 or math.sqrt(x)?

  - by Casey

  I've been wondering this for some time. As the title say, which is faster, the actual function or simply raising to the half power? UPDATE This is not a matter of premature optimization. This is simply a question of how the underlying code actually works. What is the theory of how Python code works? I sent Guido van Rossum an email cause I really wanted to know the differences in these methods. My email: There are at least 3 ways to do a square root in Python: math.sqrt, the '**' operator and pow(x,.5). I'm just curious as to the differences in the implementation of each of these. When it comes to efficiency which is better? His response: pow and ** are equivalent; math.sqrt doesn't work for complex numbers, and links to the C sqrt() function. As to which one is faster, I have no idea...

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• Mapping A Sphere To A Cube

  - by petrocket

  There is a special way of mapping a cube to a sphere described here: http://mathproofs.blogspot.com/2005/07/mapping-cube-to-sphere.html It is not your basic "normalize the point and your done" approach and gives a much more evenly spaced mapping. I've tried to do the inverse of the mapping going from sphere coords to cube coords and have been unable to come up the working equations. It's a rather complex system of equations with lots of square roots. Any math geniuses want to take a crack at it? Here's the equations in c++ code: sx = x * sqrtf(1.0f - y * y * 0.5f - z * z * 0.5f + y * y * z * z / 3.0f); sy = y * sqrtf(1.0f - z * z * 0.5f - x * x * 0.5f + z * z * x * x / 3.0f); sz = z * sqrtf(1.0f - x * x * 0.5f - y * y * 0.5f + x * x * y * y / 3.0f); sx,sy,sz are the sphere coords and x,y,z are the cube coords.

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• Concerns about reading a file in Flash 10

  - by user246114

  Hi, I'd like to read an xml file on a user's machine (which can be kind of large). There's no point in me sending the file to my server as I can do all the work I need on the file right on the client's machine. Not sure if this is a good fit though, was wondering if anyone can answer these questions before I dive in: I see at adobe's website that Flash 10 has like 94% penetration, is this true, I thought it was just released not too long ago? After opening the xml file in flash, is it possible to just throw it to a javascript function on my same page for further processing? I'd like to go into flash world for as short a time as possible. Is it at all common to use flash for file upload stuff? I heard aol/flickr are? I would need to buy flash in order to do this right, they don't have a free ide/compiler yet? Thanks

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• how to profile silverlight mvvm application with a lot of custom controls

  - by tomo

  There is a quite big LOB silverlight application and we wrote a lot of custom controls which are rather heavy in drawing. All data is loaded by RIA service, processed and bound (using INofityPropertyChanged interface) to the view. The problem is that first drawing takes a lot time. Following calls to the service (server) and redrawing is quite fast. I used Equatec profiler to track the problem. I saw that processing takes a couple of miliseconds only so my idea is that the drawing by SL engine is slow. I'm wondering if it is possible to profile somehow processes inside SL to check which drawing operations are taking too much time. Are there any guidelines how to implement faster drawing of complex custom controls?

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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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• Xcode compile error: Can't find an (old) file I used to have

  - by Carol

  This is what happens when I try to compile my iPhone app with Xcode v3.1.4 What in the world does it all mean? (And how do I fix it?) Processing /Users/carol/Documents/MyApp/build/Release-iphonesimulator/MyApp.app/Info.plist TabBarDemo2-Info.plist cd /Users/carol/Documents/MyApp setenv PATH "/Developer/Platforms/iPhoneSimulator.platform/Developer/usr/bin:/Developer/usr/bin:/usr/bin:/bin:/usr/sbin:/sbin" TabBarDemo2-Info.plist -genpkginfo /Users/carol/Documents/MyApp/build/Release-iphonesimulator/MyApp.app/PkgInfo -expandbuildsettings -format binary -o /Users/carol/Documents/MyApp/build/Release-iphonesimulator/MyApp.app/Info.plist error: The file “TabBarDemo2-Info.plist” does not exist.

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• Are government programming jobs good?

  - by Absolute0

  I am a passionate software developer and greatly enjoy programming. However I was recently contacted regarding a developer lead position for a government job at NYC for the fire department. The pay is pretty good, and I would assume the position has good job security and stability. But I am hesitant to even go for an interview as it seems like an exaggerated version of Office Space with a lot of Bureaucracy and mindless paper work. The description is as follows: The Lead Applications Developer, supporting the Programming Group, will be responsible for all phases of the system development life cycle including performing system analysis, requirements definition, database design, preparation of scopes of work, and development of project plans. Supervise programming staff and manage projects involving the design, implementation, maintenance, and enhancement of complex Oracle based user applications using Oracle Development tools. Applications will be deployed using Oracle Application Server utilizing programming languages such as JAVA, JSF, JSP, Oracle ADF, PL/SQL, and XML with J2EE and EJB technology. Anyone with previous government experience can share their two cents on this? Thank you.

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• Better to build or buy a compute grid platform?

  - by James B

  I am looking to do some quite processor-intensive brute force processing for string matching. I have run my prototype in a multi-threaded environment and compared the performance to an implementation using Gridgain with a couple of nodes (also multithreaded). The performance I observed was that my Gridgain implementation performed slower to my multithreaded implementation. It could be the case that there was a flaw in my gridgain implementation, but it was only a prototype, and I thought the results were indicative. So my question is this: What are the advantages of having to learn and then build an implementation for a particular grid platform (hadoop, gridgain, or EC2 if going hosted - other suggestions welcome), when one could fairly easily put together a lightweight compute grid platform with a much shallower learning curve?...i.e. what do we get for free with these cloud/grid platforms that are worth having/tricky to implement? (Please note, I don't have any need for a data grid) Cheers, -James (p.s. Happy to make this community wiki if needbe)

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• Staging database good practices

  - by Tom

  Hi, I'm about to deploy to production a fairly complex site and for the first time need a staging environment where I can test things in a more realistic environment, especially with regard to some external services that cannot be run locally. My general plan is to develop & test first locally, push simple changes (small bug fixes, HTML/CSS, JS, etc) direct to production, and for larger changes, push first to staging subdomain for thorough testing and then to production. I don't think that I need to keep the staging and production databases in sync (occasional manual updating would do) but I'm wondering if there are any general good practices with regard to maintaing a staging environment in relation to a production environment, especially when it comes to databases. Any general thoughts/advice/experience would be appreciated.

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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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• Include a c# file in aspx page

  - by BeraCim

  Hi all: I have an aspx page that has a @Page directive which points to a c# class. e.g. <@ Page Language="C#" EnableSessionState="true" ValidateRequest="False" Inherits="MyClass" %> MyClass extends Page, which is the code behind class for that aspx page. Now I want to add another class to the aspx page. This class does some processing and will redirect the user to another page if certain conditions are met. It will be called before the above directive. I tried adding another @Page directive, but gotten an unknown error (literally). I'm thinking that there can only be one code behind class per aspx page so I got the error when I added another one. Googling such question didnt really help me with the answer. So, how do I add another c# class to the same aspx page? Thanks.

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• How to keep views free of authorization logic in mvc?

  - by David Lay

  I have a view to display a list of items. The user can edit, delete or create new items, but according to their authorizations they may or may not be allowed to do some of this actions. I have the requirement to display only the actions which the current user is allowed to do, but I don't want to clutter the views with authorization if-else's Despise of being a very common requirement, I can't find a real satisfactory way of doing it. My best approach so far is to provide an overload to the Html.ActionLink extension method that takes the permission to ask for, but there are going to be more complex scenarios, like hiding entire blocks of html or switching a textbox for a label+hidden. Is there a better way to do this?

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• Which hosting will let me execute my own EXE with PHP?

  - by guitar-

  I have a task that PHP (or any server-side scripting language) isn't practical for. It involves a lot of file I/O, processing, etc. and it will execute a lot faster using the program I made in C instead of PHP. Do any hosts allow you to upload your own EXE files and run them on the server using PHP's exec, shell_exec, etc. functions? Do you need a dedicated server to do this? Also, I don't know if Facebook's PHP HipHop is out yet, but I really don't want to use that.

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• Strange crashes on the iPad device with core graphics functions

  - by toastie

  I am getting a lot of strange EXC_BAD_ACCESS crashes on the iPad that only happen on the device and not in the simulator. I am assuming that they are somehow memory related, but I am not sure. They all happen with image context related functions. One strange example is using CGImageCreateWithImageInRect. For example, if i run through a bunch of UIImages and crop them with CGImageCreateWithImageInRect, it will always crash at specific arbitrary sizes. Like, if I crop them all to 200x200, it crashes out after processing 12 images. If i crop them to 210x210, it works no problem. The EXC_BAD_ACCESS happens inside of "memmove" called from "CGBlt_copyBytes". That is all the debugger shows me strangely enough. I can't see the callstack going up to any of my methods. All of this works fine in the simulator! I know this is all very vague, but if anyone has any ideas, they would be greatly appreciated.

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• strchr in objective C?

  - by Brian Postow

  I'm trying to write the equivalent of strchr, but with NSStrings... I've currently got this: Boolean nsstrchr(NSString* s, char c) { NSString *tmps = [NSString stringWithFormat: @"%c", c]; NSCharacterSet *cSet = [NSCharacterSet characterSetWithCharactersInString: tmps]; NSRange rg = [s rangeOfCharacterFromSet: cSet]; return rg.location != NSNotFound; } This seems needlessly complex... Is there a way to do this (preferably, one that doesn't involve turning the NSString into a cstring which doubles the run time, or writing it myself using characterAtIndex:... Am I missing some obvious method in the NSString description?

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• Condition in ASP Repeater

  - by Abdel Olakara

  Hi all, I am trying to put a condition into my ASP repeater tag. I have a table being created and one of the td items is a link. The problem is I need to create a link upon checking the value in one the variable that is in the repeater container. Here is my code: <td><%#((VWApp.Code.TrackDM)Container.DataItem).CdNo%></td> <td><%#((VWApp.Code.TrackDM)Container.DataItem).ShippingNo%></td> Now i need to check the value of ShippingNo and rather than displaying it need to display a link. i tried to write an if condition like this: if(((VWApp.Code.TrackDM)Container.DataItem).ShippingNo. .. ) { // do processing and generate a link that needs to displayed } But i get error when trying to do this. Can anybody guide me to the right way of doing this? Any ideas and suggests are highly appreciated.

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• PyQt: How to keep QTreeView nodes correctly expanded after a sort

  - by taynaron

  I'm writing a simple test program using QTreeModel and QTreeView for a more complex project later on. In this simple program, I have data in groups which may be contracted or expanded, as one would expect in a QTreeView. The data may also be sorted by the various data columns (QTreeView.setSortingEnabled is True). Each tree item is a list of data, so the sort function implemented in the TreeModel class uses the built-in python list sort: self.layoutAboutToBeChanged.emit() self.rootItem.childItems.sort(key=lambda x: x.itemData[col], reverse=order) for item in self.rootItem.childItems: item.childItems.sort(key=lambda x: x.itemData[col], reverse=order) self.layoutChanged.emit() The problem is that whenever I change the sorting of the root's child items (the tree is only 2 levels deep, so this is the only level with children) the nodes aren't necessarily expanded as they were before. If I change the sorting back without expanding or collapsing anything, the nodes are expanded as before the sorting change. Can anyone explain to me what I'm doing wrong? I suspect it's something with not properly reassigning QModelIndex with the sorted nodes, but I'm not sure.

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• multiple records using the select_tag

  - by JZ

  I'm attempting to display multiple records, with each record displaying its own selection box. I would like to submit this form and pass a hash, having the Add.id function as the key of the hash, and the selection box option pass as the information in the hash. How could I fix my code? is this even possible with the select_tag method? <%= form_tag yardsign_adds_path, :method => :post do %> <%= select_tag "support_code[]", options_for_select([[ "1 - Strong Supporter", add.id ], [ "2 - Likely Voter" ], [ "3 - Undecided" ], [ "4 - Likely Opposed" ], [ "5 - Strongly Opposed" ]]) %> <%= submit_tag "Update" %> <% end %> Current terminal output: Started POST "/adds/yardsign" for 127.0.0.1 at 2010-04-17 01:36:03 Processing by AddsController#yardsign as HTML Parameters: {"commit"=>"Update", "authenticity_token"=>"VQ2jVfzHI7pB+87lQa9NWqvUK3zwJWiJE7CwAnIewiw=", "support_code"=>["1", "3 - Undecided", "3 - Undecided"]}

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• How can I encode four unsigned bytes (0-255) to a float and back again using HLSL?

  - by Statement

  Hello! I am facing a task where one of my hlsl shaders require multiple texture lookups per pixel. My 2d textures are fixed to 256*256, so two bytes should be sufficient to address any given texel given this constraint. My idea is then to put two xy-coordinates in each float, giving me eight xy-coordinates in pixel space when packed in a Vector4 format image. These eight coordinates are then used to sample another texture(s). The reason for doing this is to save graphics memory and an attempt to optimize processing time, since then I don't require multiple texture lookups. By the way: Does anyone know if encoding/decoding 16 bytes from/to 4 floats using 1 sampling is slower than 4 samplings with unencoded data?

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• What to look for in estimating a PowerBuilder Conversion Project?

  - by tekiegreg

  Hi there, I've been trying to do a spec for a PowerBuilder 9 to 11.5 migration of a relatively complex application. Granted PowerBuilder is not really my specialty I'm having issues trying to justify an estimate for this part of the project (and the PowerBuilder people I've been talking with have had some personal issues lately and are out of communication). These are some of the metrics that we have seen and can evaluate: -PBL Files -Main Windows -Data Windows -Functions (no we don't have the source available on this project) What metrics in particular are helpful and how long would any given "unit" such as a Data Window take?

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• Unable to encode to iso-8859-1 encoding for some chars using Perl Encode module

  - by ppant

  I have a HTML string in ISO-8859-1 encoding. I need to pass this string to HTML:Entities::decode_entities() for converting some of the HTML ASCII codes to respective chars. To so i am using a module HTML::Parser::Entities 3.65 but after decode_entities() operation my whole string changes to utf-8 string. This behavior seems fine as the documentation of the HTML::Parse. As i need this string back in ISO-8859-1 format for further processing so i have used Encode::encode("iso-8859-1",$str) to change the string back to ISO-8859-1 encoding. My results are fine excepts for some chars, a question mark is coming instead. One example is single quote ' ASCII code (’) Can anybody help me if there any limitation of Encode module? Any other pointer will also be helpful to solve the problem. Thanks

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• Idiomatic way to do list/dict in Cython?

  - by ramanujan

  My problem: I've found that processing large data sets with raw C++ using the STL map and vector can often be considerably faster (and with lower memory footprint) than using Cython. I figure that part of this speed penalty is due to using Python lists and dicts, and that there might be some tricks to use less encumbered data structures in Cython. For example, this page (http://wiki.cython.org/tutorials/numpy) shows how to make numpy arrays very fast in Cython by predefining the size and types of the ND array. Question: Is there any way to do something similar with lists/dicts, e.g. by stating roughly how many elements or (key,value) pairs you expect to have in them? That is, is there an idiomatic way to convert lists/dicts to (fast) data structures in Cython? If not I guess I'll just have to write it in C++ and wrap in a Cython import.

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• Including a pyd directly in a setup.py file

  - by Philippe Beaudoin

  I have a complex build process to generate a couple of python extension modules (.pyd). I want to include these in my setup.py for use with distutils. The distutils page talks in length about how to add extension modules from source, but I'd want to simply package these precompiled .pyd. What is the best practice to do this? Eventually, I'd also like to freeze everything in an executable with py2exe. Will I be able to do this if I directly specify the .pyd?

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• Inheritance of Custom Attributes on Abstract Properties

  - by Marty Trenouth

  I've got a custom attribute that I want to apply to my base abstract class so that I can skip elements that don't need to be viewed by the user when displaying the item in HTML. It seems that the properties overriding the base class are not inheriting the attributes. Does overriding base properties (abstract or virtual) blow away attributes placed on the original property? From Attribute class Defination [AttributeUsage(AttributeTargets.Property, Inherited = true, AllowMultiple = false)] public class NoHtmlOutput : Attribute { } From Abstract Class Defination [NoHtmlOutput] public abstract Guid UniqueID { get; set; } From Concrete Class Defination public override Guid UniqueID{ get{ return MasterId;} set{MasterId = value;}} From class checking for attribute Type t = o.GetType(); foreach (PropertyInfo pi in t.GetProperties()) { if (pi.GetCustomAttributes(typeof(NoHtmlOutput), true).Length == 1) continue; // processing logic goes here }

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