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• How much trust can I put behind a computer system? How can I measure trust?

  - by danmine

  How much trust can I put in a standard computer running windows? To what certainty can I be sure it will run my code the way I wrote it? How can I be sure that if I declare something like "int j = 5;", j will alway be 5? Is there a way to measure trust in a standard x86 computer system? What kind of protections are there to make sure that j = 5? I'm thinking about critical systems where nothing can be off even by one bit and everything must run exactly the way it was written to run.

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• Fast image coordinate lookup in Numpy

  - by victor

  I've got a big numpy array full of coordinates (about 400): [[102, 234], [304, 104], .... ] And a numpy 2d array my_map of size 800x800. What's the fastest way to look up the coordinates given in that array? I tried things like paletting as described in this post: http://opencvpython.blogspot.com/2012/06/fast-array-manipulation-in-numpy.html but couldn't get it to work. I was also thinking about turning each coordinate into a linear index of the map and then piping it straight into my_map like so: my_map[linearized_coords] but I couldn't get vectorize to properly translate the coordinates into a linear fashion. Any ideas?

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• .htaccess redirect https to http not working

  - by Ira Rainey

  I am trying to catch any https traffic to the front of my site so: https://www.domain.com is redirected to: http://www.domain.com However other subdomains need to be redirected elsewhere. For the most part this is all working, apart from the https - http redirection. Here's my .htaccess file at the moment: RewriteEngine On RewriteCond %{HTTPS} on RewriteRule (.*) http://%{HTTP_HOST}%{REQUEST_URI} RewriteCond %{HTTP_HOST} ^domain\.com [NC] RewriteRule ^(.*)$ http://www.domain.com/$1 [L,R=301] RewriteCond "%{HTTP_HOST}" !^www.* [NC] RewriteCond "%{HTTP_HOST}" ^([^\.]+).*$ RewriteRule ^(.*)$ https://secure.domain.com/a/login/%1 [L,R=301] It would seem that this bit: RewriteCond %{HTTPS} on RewriteRule (.*) http://%{HTTP_HOST}%{REQUEST_URI} isn't working as I would imagine. In fact it doesn't seem to redirect at all. In another subdirectory I have the opposite in effect which works fine: RewriteCond %{HTTPS} off RewriteRule (.*) https://%{HTTP_HOST}%{REQUEST_URI} so my thinking is the opposite should have done the job, but seemingly not. Any thoughts anyone?

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• Modular HTML in Adobe AIR? Is It Possible?

  - by Greg Bulmash

  When I write HTML with a PHP backend, I usually have a single header file and a single footer file with some PHP variables in them. The base skeleton for every page calls the header, contains the body content, and then calls the footer. That way, if I want to make changes to the header sitewide, I change one file. I'm working on developing the UI in my first Adobe AIR app and I'm wondering if there's some way to include such files in an HTML based page template there. Obviously, with the file read/write abilities in AIR, I can write a Javascript routine to pull data from a header file, parse it, and inject it into a placeholder. It just seems like such a kludge. I'm thinking there's gotta be some simple way to import a block of HTML into a page without an iFrame or complex post-processor. Something like a PHP include statement or perhaps the old Server Side Includes. Any methods you guys can recommend?

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• Is it possible to compute the minimum of three numbers by using two comparisons at the same time?

  - by Milo Hou

  I've been trying to think up of some way that I could do two comparisons at the same time to find the greatest/least of three numbers. Arithmetic operations on them are considered "free" in this case. That is to say, the classical way of finding the greater of two, and then comparing it to the third number isn't valid in this case because one comparison depends on the result of the other. Is it possible to use two comparisons where this isn't the case? I was thinking maybe comparing the differences of the numbers somehow or their products or something, but came up with nothing. Just to reemphasize, two comparisons are still done, just that neither comparison relies on the result of the other comparison. EDIT: what about: boolA = A^2 + B^2 < C^2 boolB = A > B if boolA then max=C else if boolB then max=A else max=B

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• Activating "pointer-events:none" only on section of image that overlaps

  - by Buckers

  I'm using pointer-events:none; on the main photograph at the top of my site http://www.onedirection.net/, to allow the user to select the navigation behind the image. However, I'd like to let the user click on each member of the band to go to a separate page, but ONLY for the parts of the image that don't overlap into the navigation. I'm a bit stuck with this. Can it be done? I was thinking of using an image map, but can't get it working without the navigation becoming "less clickable".

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• GNUPlot: plot different ranges with different styles

  - by Mr. Shickadance

  Hello all, I know this should be pretty simple, but I haven't been able to find a similar example. I need to plot different ranges of a datafile differently, but on the same graph. For instance, say my datafile represents a function with x and y values. I want to plot the first N values using a style like lines, and then the next M values using a different style, like points. I was thinking I would need a plot command similar to this: plot [1:5] "my.data" using 1:2 with lines, [6:12] using 1:2 with points, [13:19] using 1:2 with lines Essentially I want to distinguish different areas of the functions. Any ideas? I am sorry if it sounds like I'm rambling but I am quite stumped. Thanks in advance!

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• Icons: How does a developer with no design skill make his/her application icons look pretty?

  - by Martin

  I probably spend far too much time trying to make my visual interfaces look good, and while I'm pretty adept at finding the right match between usability and style one area I am hopeless at is making nice looking icons. How do you people overcome this (I'm sure common) problem? I'm thinking of things like images on buttons and perhaps most important of all, the actual application icon. Do you rely on third party designers, in or out of house? Or do you know of some hidden website that offers lots of icons for us to use? I've tried Google but I seem to find either expensive packages that are very specific, millions of Star Trek icons or icons that look abysmal at 16x16 which is my preferred size on in-application buttons. Any help/advice appreciated.

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• Adding a textblock to a custom wpf control (piepiece control from codeplex)

  - by bomortensen

  Hi Stackoverflow! I'm currently building a Surface application where the main navigation is a circular menu. For each menu item I'm using a custom control that I found on codeproject.com: http://www.codeproject.com/KB/WPF/PieChartDataBinding.aspx (PiePiece control) The number of submenu items (which is also piepiece controls) comes from a database and thus dynamically loaded. What I can't figure out is how I add a textblock to this custom control to display the submenu item text. It needs to follow the PiePiece's RotationAngle property to line up correctly. Anyone got a hot-fix for this? I was thinking about adding another dependencyproperty to the piepiece custom control, but that way I can't set the font-family, size etc (can I?) Any input on this is greatly appreciated! Thanks!

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• stack dump accessing malloc char array

  - by robUK

  Hello, gcc 4.4.3 c89 I have the following source code. And getting a stack dump on the printf. char **devices; devices = malloc(10 * sizeof(char*)); strcpy(devices[0], "smxxxx1"); printf("[ %s ]\n", devices[0]); /* Stack dump trying to print */ I am thinking that this should create an char array like this. devices[0] devices[1] devices[2] devices[4] etc And each element I can store my strings. Many thanks for any suggestions,

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• Split text files Accross threads

  - by Kevin

  The problem: I have a few text files (10) with numbers in them on every line. I need to have them split across some threads I create using the pthread library. these threads that are created (worker threads) are to find the largest prime number that gets sent to them (and over all the largest prime from all of the text files). My current thoughts on solutions: I am thinking myself to have two arrays and all of the text files in one array and the other array will contain a binary file that I can read say 1000 lines and send the pointer to the index of that binary file in a struct that contains the id, file pointer, and file position and let it crank through that. a little bit of what I am talking about pthread_create(&threads[index],NULL,calc_sqrt,(void *)threadFields[index]);//Pass struct to each worker Struct: typedef struct threadFields{ int *id, *position; FILE *Fin; }tField; If anyone has any insight or a better solution it would be greatly appreciated Thanks

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• How to convert from integer to unsigned char in C, given integers larger than 256?

  - by Alf_InPogform

  As part of my CS course I've been given some functions to use. One of these functions takes a pointer to unsigned chars to write some data to a file (I have to use this function, so I can't just make my own purpose built function that works differently BTW). I need to write an array of integers whose values can be up to 4095 using this function (that only takes unsigned chars). However am I right in thinking that an unsigned char can only have a max value of 256 because it is 1 byte long? I therefore need to use 4 unsigned chars for every integer? But casting doesn't seem to work with larger values for the integer. Does anyone have any idea how best to convert an array of integers to unsigned chars?

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• Mixing JPA annotations and XML configuration

  - by HDave

  I have a fairly large (new) project in which we have annotated many domain classes with JPA mappings. Now it is time to implement many named queries -- some entities may have as many as 15-20 named queries. I am thinking that writing these named queries in annotations will clutter the source files and therefore am considering putting these in XML mapping files. Is this possible? Mort importantly, is this reasonable? Are there better approaches? How is this done?

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• how to add image button for a datagrid ( drill down grid)

  - by prince23

  hi i need to perform drill down data grid operation using silver light . the screen shoot wat i have provided is done using asp.net and image 1 now i have done the same thing using silver light 4. n promblem: i havent added an image button in data grid i dnt know how to do it in silver light where i shold be placing eitther in datatemplate are wat ? . how to handle the event and change the state and once i click an row i should be changing the state of image that is from image1 to image2 telling the row is expanded i thinking by looking at the screen shoot you people can come to know wat i am actually looking for i want to display data in same way using expand and collpase using the image button any code on it how to achive this one would be really help full for me. plz help me out crying 4 an help from past 2days. i have searched entire google would not found how to solve the promblem thanks

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• Haskell - mapping the odd placed values and the even placed values differently

  - by Abstract

  Hey guys, is there an easy way. To take a list of numbers, say 123456. Then multiply the odd placed by three and the even placed by 1. i.e. (1 * 3) + (2 * 1) + (3 * 3) + (4*1) + (5*3) + (6*1) i was thinking the map function somewhere along the lines. But i don't know how to map *3 to just the odd placed values. Oh and if you could give me the version not in prelude that would be great like the actual function or functions, as if its being imported from an external haskell file Thanks for the help

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• What are the standard/practical steps required before moving to implementation of any Project/Task?

  - by jkm

  What are the standard/practical steps required before moving to implementation of any Project/Task? Hi everyone, I liked stackoverflow very much and just got registered. As I am a beginner in programming, most of the time i just implement/code my tasks directly not even thinking of creating any dfd's, flowcharts or other tools for my new classes and methods. In some interviews i was asked what process you follow and i was confused as i am not very used to follow any standards. So If some experts can help me that what steps and in what order are the best practices for solving/approaching any task in programming. And how important these are? Thanks in advance! and sorry if this question is trivial one/already asked.

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• .NET make a copy of an embedded file resource to the local drive

  - by Matt H.

  Hi, i'm new to the realm to working with Files in .NET I'm creating a WPF application in VB.NET with the 3.5 Framework. (If you provide an example in C#, that's perfectly fine.) In my project I have a Template for an MS Access database. My desired behavior is that when the users clicks File--New, they can create a new copy of this template, give it a filename, and save it to their local directory. The database already has the tables and some starting data needed to interface with my application (a user-friendly data editor) I'm thinking the approach is to include this "template.accdb" file as a resource in the project, and write it to a file somehow at runtime? Any guidance will be very, very appreciated. Thanks!

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• Measure CPU performance via JS

  - by Nicholas Kyriakides

  A webapp has as a central component a relatively heavy algorithm that handles geometric operations. There are 2 solutions to make the whole thing accessible from both high-end machines and relatively slower mobile devices. I will use RPC's if i detect that the user machine is ''slow'' or else if i detect that the user machine can handle it OK, then i provide to the webapp the script to handle it client side. Now what would be a reliable way to detect the speed of the user machine? I was thinking of providing a sample script as a test when the page loads and detect the time it took to execute that. Any ideas?

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• how to write floating value accurately to a bin file.

  - by user319873

  Hi I am trying to dump the floating point values from my program to a bin file. Since I can't use any stdlib function, I am thinking of writting it char by char to a big char array which I am dumping in my test application to a file. It's like float a=3132.000001; I will be dumping this to a char array in 4 bytes. Code example would be:- if((a < 1.0) && (a > 1.0) || (a > -1.0 && a < 0.0)) a = a*1000000 // 6 bit fraction part. Can you please help me writting this in a better way.

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• Unit testing with serialization mock objects in C++

  - by lhumongous

  Greetings, I'm fairly new to TDD and ran across a unit test that I'm not entirely sure how to address. Basically, I'm testing a couple of legacy class methods which read/write a binary stream to a file. The class functions take a serializable object as a parameter, which handles the actual reading/writing to the file. For testing this, I was thinking that I would need a serialization mock object that I would pass to this function. My initial thought was to have the mock object hold onto a (char*) which would dynamically allocate memory and memcpy the data. However, it seems like the mock object might be doing too much work, and might be beyond the scope of this particular test. Is my initial approach correct, or can anyone think of another way of correctly testing this? Thanks!

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• Application settings methods? c++

  - by flyout

  I am thinking about adding configurable settings to an application, and I think the easiest ways are an external file or win registry (its a win only app). Which way would be better? I was wondering, an user with not enough permissions may not be able to create/write the config file. And in the case of the registry, would todays antivirus allow me to add/edit/remove keys? Or they only monitor certain keys? Also, if someone knows a class/lib to manage config settings (in pure win32) in vc++ please post it.

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• Writing a simple webservice in C# and calling it from Ruby on Rails

  - by hopeless

  I need to create a simple webservice in C# but I'm not sure where to start (I've coded UI apps in C# before but all my web experience is in Ruby on Rails). Where do I start? The only client for the webservice will be a Ruby on Rails app so there's no need for any HTML rendering. I was thinking of just returning a XML or YAML formatted string unless there's an easier way. I'm not too keen on SOAP but if it's easy/natural in C# & Ruby then I'd consider it (or anything else).

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• Will using a VCS help me as a web dev?

  - by jsims281

  I'm thinking of trying a VCS such as subversion, to manage my next project, but I'm not sure if will offer any real benefits for me as a web developer. As I understand it, one of the major benefits of a VCS is that a group of people can work on a project at once. Reading material on the subject seems pretty one sided: "Using a version control system is an absolute must for a developer of a project above a few hundred lines of code" ...and I've got a feeling it could become a chore, with not many benefits. I work on development server on the local network, so any amount of people can work on the files already. If anyone needs to get in remotely, they use FTP. What would a modern version control system give me on top of this?

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• How would you create a notification system like on SO or Facebook in RoR?

  - by Justin Meltzer

  I'm thinking that notifications would be it's own resource and have a has_many, through relationship with the user model with a join table representing the associations. A user having many notifications is obvious, and then a notification would have many users because there would be a number of standardized notifications (a commenting notification, a following notification etc.) that would be associated with many users. Beyond this setup, I'm unsure how to trigger the creation of notifications based on certain events in your application. I'm also a little unsure of how I'd need to set up routing - would it be it's own separate resource or nested in the user resource? I'd find it very helpful if someone could expand on this. Lastly, ajax polling would likely improve such a feature. There's probably some things I'm missing, so please fill this out so that it is a good general resource.

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• decode mysql query before returning it to view

  - by stormdrain

  I'm running a query to mysql that returns encrypted data. I'd like, if possible, to decode the results before sending it to the view. It seems like better form to handle the decoding in the controller (or even the model) rather than inside the view. I can't seem to wrap my head around how to do it, though. I was thinking I could iterate through the object, decodode it, and push it to another array that would be sent to the view. Problem with this is I won't know (and need to keep) the indexes of the query. So the query might return something like: [id] => 742 [client_id] => 000105 [last] => dNXcw6mQPaGQ4rXfgIGJMq1pZ1dYAim0 [first] => dDF7VoO37qdtYoYKfp1ena5mjBXXU0K3dDlcq1ssSvCgpOx75y0A== [middle] =>iXy6OWa48kCamViDZFv++K6okIkalC0am3OMPcBwK8sA== [phone] => eRY3zBhAw2H8tKE Any ideas?

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