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• Is ZeroMQ a good choice to make a Python app and a C# managed assembly work together?

  - by Alex Bausk

  I have a task that involves talking to a .NET-based API (namely AutoCAD) to retrieve data, send commands, and react to events. I want to separate the API operations and the proper program logic (largely already implemented in Python) by using natural tools for both: a C# DLL for the former and a Python app for the latter. To connect these two pieces, I began exchanging JSON in ZeroMQ messages. I'm at early development stages but having recently discovered that ZeroMQ does not guarantee message delivery/order, I have reservations about whether this is a feasible way to go. Right now my app is a very basic REQ/REP pair and I plan to handle reacting to events and executing different commands by adding some sort of 'recipient-function' field to my message format. The reason that I want to use ZMQ is that I might be able to scale the software into a larger, multi-user, distributed solution sometime. I am a lay programmer so I would ask for your advice about this architecture. Should I just go ahead with it and plan to deal with message reliability/ordering when problems appear? Should I consider developing some kind of a REST wrapper around ZMQ?

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• What's the best way to move cars along roads

  - by David Thielen

  I am implementing car movement game (sort-of like Locomotion). So 60 times a second I have to advance the movement of each car. The problem is I have to look ahead to see if there is a slower car, stop sign, or red light ahead. And then slow down appropiately. I also want to have the cars take time to go from stopped to full speed and again to slow down. I'm not implementing full-blown physics, but just a tick by tick speed up/slow down as that provides most of the realism to match what people expect to see. The best I've come up with is to walk out the full distance the car would travel of it was slowing to a stop and see if anywhere along that path it needed to slow down or stop. And then move it forward appropiately. I am moving the cars 60 times a second so I need this to be fast. And walking out that whole path each tick strikes me as processor intensive. What's the best way to do this?

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• Would form keys reduce the amount of spam we receive?

  - by David Wilkins

  I work for a company that has an online store, and we constantly have to deal with a lot of spam product reviews, and bogus customer accounts. These are all created by automated systems and are more of a nuisance than anything. What I am thinking of (in lieu of captcha, which can be broken) is adding a sort of form key solution to all relevant forms. I know for certain some of the spammers are using XRumer, and I know they seldom request a page before sending us the form data (Is this the definition of CSRF?) so I would think that tying a key to each requested form would at least stem the tide. I also know the spammers are lazy and don't check their work, or they would see that we have never posted a spam review, and they have never gained any revenue from our site. Would this succeed in significantly reducing the volume of spam product reviews and customer account creations we are seeing? EDIT: To clarify what I mean by "Form Keys": I am referring to creating a unique identifier (or "key") that will be used as an invisible, static form field. This key will also be stored either in the database (relative to the user session) or in a cookie variable. When the form's target gets a request, the key must be validated for the form's data to be processed. Those pesky bots won't have the key because they don't load the javascript that generates the form (they just send a blind request to the target) and even if they did load the javascript once, they'd only have one valid key, and I'm not sure they even use cookies.

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• Cannot view, use, or open CDs or DVDs in Ubuntu 12.04

  - by user67592

  I am fairly new to Ubuntu 12.04 and I have encountered a rather irritating problem. Whenever I insert a CD or DVD (whether it have data, music, movies, or nothing at all), nothing pops up saying "you have inserted a CD", "play with Rhythmbox?" etc. It doesn't show the CD in the launcher/dock or anything of the sort. This is especially peculiar because not only do I have a standard IDE built-in optical drive, but I have an external USB optical drive. Neither work. In addition, whenever I go to "Computer///" and I click (double click, right click, or even left click) on "CD/DVD Drive" nothing happens, when I right click and select "Open" nothing happens either [for either of the two drives (both are listed in Computer///)] And if I insert a blank disk and go to a disk burning program such as Brasero, and try to burn to the drive it detects no CDs or DVDs of any kind. I'm rather stumped and can't seem to find a question similar to this. :( Thanks for all your help in advance!! :) ~Preston Output of sudo lshw *-cdrom description: DVD-RAM writer product: CD/DVDW TS-H652M vendor: TSSTcorp physical id: 0.0.0 bus info: scsi@5:0.0.0 logical name: /dev/cdrom logical name: /dev/cdrw logical name: /dev/dvd logical name: /dev/dvdrw logical name: /dev/sr0 version: 0414 capabilities: removable audio cd-r cd-rw dvd dvd-r dvd-ram configuration: ansiversion=5 status=nodisc *-cdrom description: DVD reader product: DVD Writer 300n vendor: HP physical id: 0.0.0 bus info: scsi@4:0.0.0 logical name: /dev/cdrom2 logical name: /dev/cdrw2 logical name: /dev/dvd2 logical name: /dev/sr1 version: 1.25 serial: [ capabilities: removable audio cd-r cd-rw dvd configuration: status=nodisc

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• How do I fix a terrible system error on ubuntu 12.04

  - by Anonymous

  I don't know what happened, but one day my computer had some sort of a system error and could no longer update itself. The software center will not open, it will begin to initialize and then a message pops up saying theres a system error and needs to shut down the software center. Then another box pops up after I go to report it saying it was unable to identify source or package name. I also can't extract a zipped folder to anything, or reinstall Ubuntu from a USB boot drive anymore, it keeps telling me my my computer isn't compatible when I know for a fact it is, because thats how I got Ubuntu on here in the first place. the only thing I know about this error is that a message popped up after I went to check for updates saying to report the problem and include this message in the report: 'E:malformed line 56 in source list /etc/apt/sources.list (dist parse)' it also called it a bug. I just want to know how to either get rid of the bug completely or find some way to be able to reinstall Ubuntu again. I know it's not a lot of information, but It's all I can give. Sorry.

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• Can i change the order of these OpenGL / Win32 calls?

  - by Adam Naylor

  I've been adapting the NeHe ogl/win32 code to be more object orientated and I don't like the way some of the calls are structured. The example has the following pseudo structure: Register window class Change display settings with a DEVMODE Adjust window rect Create window Get DC Find closest matching pixel format Set the pixel format to closest match Create rendering context Make that context current Show the window Set it to foreground Set it to having focus Resize the GL scene Init GL The points in bold are what I want to move into a rendering class (the rest are what I see being pure win32 calls) but I'm not sure if I can call them after the win32 calls. Essentially what I'm aiming for is to encapsulate the Win32 calls into a Platform::Initiate() type method and the rest into a sort of Renderer::Initiate() method. So my question essentially boils down to: "Would OpenGL allow these methods to be called in this order?" Register window class Adjust window rect Create window Get DC Show the window Set it to foreground Set it to having focus Change display settings with a DEVMODE Find closest matching pixel format Set the pixel format to closest match Create rendering context Make that context current Resize the GL scene Init GL (obviously passing through the appropriate window handles and device contexts.) Thanks in advance.

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• How can I deal with a difficult developer that is holding back the project? [migrated]

  - by ILovePaperTowels

  Our entire project is being held up because of one piece which is being handled by a single developer. When we did finally got the latest version of his code and started reviewing it, we found the code was horrendous! Its a relatively simply workflow, however the code is so complex that it's very difficult to step through and review/debug. The developer responsible has a hard time accepting any kind of criticism, and feels he is more knowledgeable than others members of the team. It's difficult to even talk to him about his development work because it turns into "I know what I'm talking about and you're just wrong!" type of conversation. A request has already been put in to replace this developer but management is not doing anything. This is probably because devs are in short supply where we are, and this is a corporation has a lot of office drama. I'm just one of the developers, not the project manager, however I really want to see this project succeed. What can I do in this sort of situation to try and keep the project on track?

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• When can I publish a software tool written at work?

  - by AlexMA

  I'm working on a software problem at work that is fairly generic, but I can't find a library I like to solve it, so I'm considering writing one myself (at least a bare-bones version). I'll be writing some if not all of the 1.0 version at work, since I need it for the project. If turns out well I might want to bring the work home and polish it up just for fun, and maybe release it as an open-source project. However, I'm concerned that if I wrote the 1.0 version at work I may not be allowed to do this from a legal sense. Obviously I could ask my boss (who probably won't care), but I'm curious how other programmers have dealt with this issue and where the law stands here. My one sentence question is, When is it okay (legally/ethically) to open-source a software tool originally written by you for work at work? What if you have expanded the original source significantly during off-hours? Follow-up: Suppose I write the whole thing at home on my time then simply use it at work, does that change things drastically? Follow-up 2: Note that I'm not trying to rip off my employer (I understand that they're paying me to build products that they own)--I'm just wondering if there's a fair way of doing this for all involved... It would be nice if some nonprofit down the road could use my code and save them some time. Also, there's another issue at stake. If I write the library for a very simple, generic thing (like HTML tables in Javascript), does that mean I can never again do so on my own time without putting myself at legal risk (even if it was a whole new fresh rewrite or a segment of a larger project). Am I surrendering my right to write code for this sort of project for the rest of my life (without this company's permission), since the code at work might still be somewhere in my brain influencing me? This seems related to software patents, as a side-note.

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• .NET vs Windows 8: Rematch!

  - by Simon Cooper

  So, although you will be able to use your existing .NET skills to develop Metro apps, it turns out Microsoft are limiting Visual Studio 2011 Express to Metro-only. From the Express website: Visual Studio 11 Express for Windows 8 provides tools for Metro style app development. To create desktop apps, you need to use Visual Studio 11 Professional, or higher. Oh dear. To develop any sort of non-Metro application, you will need to pay for at least VS Professional. I suspect Microsoft (or at least, certain groups within Microsoft) have a very explicit strategy in mind. By making VS Express Metro-only, developers who don't want to pay for Professional will be forced to make their simple one-shot or open-source application in Metro. This increases the number of applications available for Windows 8 and Windows mobile devices, which in turn make those platforms more attractive for consumers. When you use the free VS 11 Express, instead of paying Microsoft, you provide them a service by making applications for Metro, which in turn makes Microsoft's mobile offering more attractive to consumers, increasing their market share. Of course, it remains to be seen if developers forced to jump onto the Metro bandwagon will simply jump ship to Android or iOS instead. At least, that's what I think is going on. With Microsoft, who really knows?

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• What Is The Formula for the 3 of 9 Bar Code Alphabet?

  - by Chris Moschini

  Background: 3 of 9 Barcode Alphabet A simple syntax for 3 of 9 bar codes What is the formula behind the alphabet and digits in a 3 of 9 bar code? For example, ASCII has a relatively clear arrangement. Numbers start at 33, capitals at 65, lowercase at 97. From these starting points you can infer the ASCII code for any number or letter. The start point for each range is also a multiple of 32 + 1. Bar codes seem random and lacking sequence. If we use the syntax from the second link, this is the first six characters in 3 of 9: A 100-01 B 010-01 C 110-00 D 001-01 E 101-00 F 011-00 I see no pattern here; what is it? I'm as much interested in the designer's intended pattern behind these as I am in someone devising an algorithm of their own that can give you the above code for a given character based on its sequence. I struggled with where to put this question; is it history, computer science, information science? I chose Programmers because a StackExchange search had the most barcode hits here, and because I wanted to specifically relate it to ASCII to explain what sort of formula/explanation I'm looking for.

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• Queueing up character actions

  - by TheBroodian

  I'm developing a 2D platformer with action-fighter elements. Currently things are working relatively smoothly but I'm having difficulty sorting something out. For the time, keeping my character's states and actions separated and preventing them from stepping on each others' toes is working out well and properly, but I would like to add a feature to my character to get him to behave a little bit more fluidly for the player. At the moment, he has numerous attacks and abilities that he can execute, all of them being executed with button presses. Here lies the problem: Being as everything is executed through button presses, while an action is in progress I flag the game to disregard further button presses until the action has completed. Therefore, consecutive actions cannot be performed until after the previous action has completed entirely. In runtime this behavior feels very icky, and very ungamelike. In games that rest most memorably at the forefront of my mind the player is able to execute button commands during the process of actions, and at the end of the current action, the following action is executed (seems like some sort of a queue system or something) Can anybody offer any guidance with this?

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• Rewrite img and link paths with htaccess and serve the file from rewritten path?

  - by frequent

  I have a static mockup page, which I want to "customize" by switching a variable used in image-src and link-href attributes. Paths will look like this: <img src="/some/where/VARIABLE/img/1.jpg" alt="" /> <link rel="some" href="/some/where/VARIABLE/stuff/foo.bar" /> I'm setting a cookie with the VARIABLE value on the preceding page and now want to modfiy the paths accordingly by replacing VARIABLE with the cookie value. I'm a htaccess newbie. This is what I have (doesn't work): <IfModule mod_rewrite.c> # get cookie value cookie RewriteCond %{HTTP_COOKIE} client=([^;]*) # rewrite/redirect to correct file RewriteRule ^/VARIABLE/(.+)$ /%1/$1 [L] </IfModule> So I thought my first line gets the cookie value and stores this in %1. And on the second line I'm filtering VARIABLE, replace it with the cookie value and whatever comes after VARIABLE in $1. Thanks for sheeding some light on what I'm doing, doing wrong and if I can do this at all using htaccess. EDIT: I'm sort of halfway through, but it's still not working... Mabye someone can apply the finishing touches: <IfModule mod_rewrite.c> # check for client cookie RewriteCond %{HTTP_COOKIE} (?:^|;\s*)client=([^;]*) # check if an image was requested RewriteCond %{REQUEST_FILENAME} \.(jpe?g|gif|bmp|png)$ # exclude these folders RewriteCond %{REQUEST_URI} !some/members/logos # grab everything before the variable folder and everything afterwards # replace this with first bracket/cookie_value/second bracket RewriteRule (^.+)/VARIABLE/(.+)$ $1/%1/$2 [L] </IfModule> Still can't get it to work, but I think this is the correct way of doing it. Thanks for help!

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• Serializing network messages

  - by mtsvetkov

  I am writing a network wrapper around boost::asio and was wondering what is a good and simple way to serialize my messages. I have a message factory which can take care of dispatching the data to the correct builder, but I want to know if there are any established solutions for getting the binary data on the sender side and consequently passing the data for deserialization on the receiver end. Some options I've explored are: passing a pointer to a char[] to the serialize/deserialize functions (for serialize to write to, and deserialize to read from), but it's difficult to enforce buffer size this way; building on that, I decided to have the serialize function return a boost::asio::mutable_buffer, however ownership of the memory gets blurred between multiple classes, as the network wrapper needs to clean up the memory allocated by the message builder. I have also seen solutions involving streambuf's and stringstream's, but manipulating binary data in terms of its string representation is something I want to avoid. Is there some sort of binary stream I can use instead? What I am looking for is a solution (preferrably using boost libs) that lets the message builder dictate the amount of memory allocated during serialization and what that would look like in terms of passing the data around between the wrapper and message factory/message builders. PS. Messages contain almost exclusively built-in types and PODs and form a shallow but wide hierarchy for the sake of going through a factory. Note: a link to examples of using boost::serialization for something like this would be appreciated as I'm having difficulties figuring out the relation between it and buffers.

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• How to handle the different frame rate on different devices?

  - by Fenwick

  I am not quite sure how frame per second works on a web page. I have a Canvas game that involves in moving an image from point A to B, and measuring the time elapsed. The code can be as simple as: var timeStamp = Date.now(); function update(){ obj.y += obj.speed; text = "Time: "+ (Date.now() - timeStamp) + "ms"; } The function update() is called every frame. The problem is that the time elapsed is different from device to device. It is pretty short on my PC, but get longer on my iPad, and is much longer on my cell phone. I thought it is because the FPS is smaller on mobile devices, so instead of calling update() every frame, I call it every 1ms by using a setInterval. But this does not solve the problem. In my understanding, the function for setInterval is invoked based on the increment in system time, other than frame rate, so it should fix the problem. Am I missing anything here? If the setInterval function is called based on FPS, is there any way to get around with the FPS difference across devices? On a side note, I have sort of a "water simulator" on the same canvas. It involves in redrawing about 60 objects which can be 600x600 pixels for every frame, so it could be a frame rate killer. I am using Phaser.js but not really using much of its functionalities, if that helps.

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• Does IE have more strict Javascript parsing than Chrome?

  - by Clay Shannon

  This is not meant to start a religio-technical browser war - I still prefer Chrome, at least for now, but: Because of a perhaps Chrome-related problem with my web page (see https://code.google.com/p/chromium/issues/detail?can=2&start=0&num=100&q=&colspec=ID%20Pri%20M%20Iteration%20ReleaseBlock%20Cr%20Status%20Owner%20Summary%20OS%20Modified&groupby=&sort=&id=161473), I temporarily switched to IE (10) to see if it would also view the time value as invalid. However, I didn't even get to that point - IE stopped me in my tracks before I could get there; but I found that IE was right - it is more particular/precise in validating my code. For example, I got this from IE: SCRIPT5007: The value of the property '$' is null or undefined, not a Function object ...which was referring to this: <script src="/CommonLogin/Scripts/jquery-1.9.1.min.js" type="text/javascript"></script> <script type="text/javascript"> // body sometimes becomes white???? with jquery 1.6.1 $("body").css("background-color", "#405DA7"); < This line is highlighted as the culprit: $("body").css("background-color", "#405DA7"); jQuery is referenced right above it - so why did it consider "$" to be undefined, especially when Chrome had no problem with it...ah! I looked at that location (/CommonLogin/Scripts/) and saw that, sure enough, the version of jQuery there was actually jquery-1.6.2.min.js. I added the updated jQuery file (1.9.1) and it got past this. So now the question is: why does Chrome ignore this? Does it download the referenced version from its own CDN if it can't find it in the place you specify? IE did flag other errs after that, too; so I'm thinking perhaps IE is better at catching lurking problems than, at least, Chrome is. Haven't tested Firefox diesbzg yet.

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• Dedicated Servers: Is one better then two for LAMP pseudo HA setup? [closed]

  - by bikedorkseattle

  Possible Duplicate: How to find web hosting that meets my requirements? I know there are zillions of commentary about hosting out there, but I haven't read much about this. Our current well known host is having too many problems, the hardware we are on it subpar, and I'm ready to leave. A day of downtime can cost as much as our monthly hosting bill. A month of bad performance is just killing us right now, user and google wise. I'm wondering about running two dedicated boxes for LAMP, one running as the primary Nginx/Apache (proxy pass), and the other as the MySQL box. Running a single box scares the bejesus out of me because who knows how long it will take anyone to fix a raid card or whatever. The idea is to set this up using some sort of failover system using pacemaker and heartbeat. If one server goes down the other can take over for the other running both web and db. There are some good articles over at Linode about this. I have a few DBs that are 1GB+ and would like to load them into memory. Because of this, I'm shying away from a Linode HA setup because for the price I could do it with two dedicated like I described. Am I mad or an idiot? What are people out there doing for pseodu high availability good performance setups under $400/month? I'm a webmaster; I do a lot of things none of it that well :)

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• How to store a list of Objects that might change in future?

  - by Amogh Talpallikar

  I have set of Objects of the same class which have different values of their attributes. and I need to find the best match from a function under given scenarios out of these objects. In future these objects might increase as well. Quite similar to the way we have Color class in awt. we have some static color objects in the class with diff rgb values. But in my case say, I need to chose the suitable color out of these static ones based on certain criteria. So should I keep them in an arrayList or enum or keep them as static vars as in case of Colors. because I will need to parse through all of them and decide upon the best match. so I need them in some sort of collection. But in future if I need to add another type I will have to modify the class and add another list.add(object) call for this one and then it will violate the open-close principle. How should I go about it ?

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• More Denali Execution Plan Warning Goodies

  - by Dave Ballantyne

  In my last blog, I showed how the execution plan in denali has been enhanced by 2 new warnings ,conversion affecting cardinality and conversion affecting seek, which are shown when a data type conversion has happened either implicitly or explicitly. That is not all though, there is more .  Also added are two warnings when performance has been affected due to memory issues. Memory spills to tempdb are a costly operation and happen when SqlServer is under memory pressure and needs to free some up. For a long time you have been able to see these as warnings in a profiler trace as a sort or hash warning event,  but now they are included right in the execution plan.  Not only that but also you can see which operator caused the spill , not just which statement.  Pretty damn handy. Another cause of performance problems relating to memory are memory grant waits.  Here is an informative write up on them,  but simply speaking , SQLServer has to allocate a certain amount of memory for each statement. If it is unable to you get a “memory grant wait”.  Once again there are other methods of analyzing these,  but the plan now shows these too. Don't worry that’s not real production code There is one other new warning that is of interest to me, “Unmatched Indexes”.  Once I find out the conditions under which that fires ill blog about it.

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• How to optimize calls to multiple APIs at once and return as one set?

  - by Martin

  I have a web app that searches across 2 APIs right now. I have my own Restful web service that I call, and it does all the work on the backend to asynchronously call the 2 APIs and concatenate them into one result set for my web app to use. I want to scale this out and add as many other APIs as I can (currently looking at about 10 more). But as I add APIs, the call to my service gets (potentially) slower and more complex. How do I handle one API not responding ... and other issues that arise? What would be the best way to approach this? Should I create a service call for each API, that way each one is independent and not coupled to all the other calls? Is there a way on the backend to handle the multiple API calls without all the extra complexity it adds? If I go the route of a service call per API, now my client code gets more complex (and I have a lot of clients)? And it's more work for the client, and since I have mobile apps, it will cost the client more data usage. If I go one service call, is there a way to set up some sort of connection so I can return data as I get it, in case one service call hangs?

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• Access Control Service: Programmatically Accessing Identity Provider Information and Redirect URLs

  - by Your DisplayName here!

  In my last post I showed you that different redirect URLs trigger different response behaviors in ACS. Where did I actually get these URLs from? The answer is simple – I asked ACS ;) ACS publishes a JSON encoded feed that contains information about all registered identity providers, their display names, logos and URLs. With that information you can easily write a discovery client which, at the very heart, does this: public void GetAsync(string protocol) {     var url = string.Format( "https://{0}.{1}/v2/metadata/IdentityProviders.js?protocol={2}&realm={3}&version=1.0",         AcsNamespace,         "accesscontrol.windows.net",         protocol,         Realm);     _client.DownloadStringAsync(new Uri(url)); } The protocol can be one of these two values: wsfederation or javascriptnotify. Based on that value, the returned JSON will contain the URLs for either the redirect or notify method. Now with the help of some JSON serializer you can turn that information into CLR objects and display them in some sort of selection dialog. The next post will have a demo and source code.

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• Adding delay between damage

  - by iQue

  I have a bunch of enemies chasing my main-character, and if they intersect I want them to damage him and that's all good. The problem is that right now they damage him as long as they stand around him, every frame! and since it gets called every frame my character's HP reaches 0 almost instantly. I've tried adding delay and I've tried a timertask, but can't get it to work. This is the code I use to check for intersection: private void checkCollision(Canvas canvas) { synchronized (getHolder()) { Rect h1 = happy.getBounds(); for (int i = 0; i < enemies.size(); i++) { for (int j = 0; j < bullets.size(); j++) { Rect b1 = bullets.get(j).getBounds(); Rect e1 = enemies.get(i).getBounds(); if (b1.intersect(e1)) { enemies.get(i).damageHP(5); bullets.remove(j); } if(e1.intersect(h1)){ happy.damageHP(5); // this is the statement that needs some sort of delay, I want them to damage him every 2 seconds they intersect him. } if(enemies.get(i).getHP() <= 0){ enemies.get(i).death(canvas, enemies); score.incScore(5); break; } if(happy.getHP() <= 0){ score.incScore(-50); //end-screen } } } } } If anyone knows the logic to do this please do tell.

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• RESTful applications logic and cross resource operations

  - by Gaz_Edge

  I have an RESTful api that allows my users to receive enquiries about their business e.g. 'I would like to book service x on date y. Is this available?'. The api saves this information as a resource to the following URI users/{userId}/enquiries/{enquiryId} The information shown when this resource is retrieved are the standard sort of things you'd expect from an enquiry - email, first_name, last_name, address, message The api also allows customers to be created for a user. The customer has a login and password and also a profile. The following URIs expose these two resources PUT users/{userId}/customers/{customerId} PUT users/{userId}/customers/{customerId}/profile The problem I am having is that I would like to have the ability to allow users to create a customer from an enquiry. For example, the user is able to offer their service on the date requested and will then want to setup a customer with login details etc to allow them to manage the rest of the process. The obvious answer would be to use a URI like users/{userId}/enquiries/{enquiryId}/convert-to-client The problem with this is is that it somewhat goes against a lot of what I've been reading about how to implement REST (specifically from the book Restful Web Services which suggests that URIs should point to resources not operations on resources). The other option would be to get the client application (i.e. the code that calls the api) to handle some of this application logic. This doesn't quite feel right to me. I have implemented in my design that the client app is fairly dumb. It knows just enough to display the results from the API, and does not contain any application logic. Would be great to hear what others views are on the best way of setting this up Am I wrong to have no application logic in the client app? How would I perform this operation purely in the REST api?

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• Login takes very long, annoying repaints once a minute when logged in: How to troubleshoot?

  - by user946850

  I am suffering from a strange problem with my Gnome Shell in Ubuntu 12.10. The login takes very long ( 30 sec), with a blank screen. In Google Chrome and Thunderbird (and perhaps in other applications), the main window freezes and is repainted in periodic intervals of less than one minute. The freeze takes several seconds, and it seems that font and appearance of, e.g., tabs and buttons briefly changes. Attempting to enable the second monitor show an error message related to XRANDR. Everything seems to have started three days ago, after I had to force-shutdown the machine while it was hibernating due to low power. (It was hibernating for quite a while and didn't want to stop.) Silly me. I have tried the following measures, with no avail: Checked all package file md5 hashes using debsums Reinstalled all packages using a variant of dpkg --get-selection \* | xargs apt-get install -reinstall Temporarily moved configuration directories such as .gconf, .config and .gnome2 to another location Created a new user account When I choose "Ubuntu" during login, the problems disappear. I am sort of frustrated that reinstalling all packages didn't fix the issue. How to troubleshoot this Gnome Shell (?) problem, short of reinstalling the system? (Or did anyone see this kind of behavior on their machine?)

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• Lerping to a center point while in motion

  - by Fibericon

  I have an enemy that initially flies in a circular motion, while facing away from the center point. This is how I achieve that: position.Y = (float)(Math.Cos(timeAlive * MathHelper.PiOver4) * radius + origin.Y); position.X = (float)(Math.Sin(timeAlive * MathHelper.PiOver4) * radius + origin.X); if (timeAlive < 5) { angle = (float)Math.Atan((0 - position.X) / (0 - position.Y)); if (0 < position.Y) RotationMatrix = Matrix.CreateRotationX(MathHelper.PiOver2) * Matrix.CreateRotationZ(-1 * angle); else RotationMatrix = Matrix.CreateRotationX(MathHelper.PiOver2) * Matrix.CreateRotationZ(MathHelper.Pi - angle); } That part works just fine. After five seconds of this, I want the enemy to turn inward, facing the center point. However, I've been trying to lerp to that point, since I don't want it to simply jump to the new rotation. Here's my code for trying to do that: else { float newAngle = -1 * (float)Math.Atan((0 - position.X) / (0 - position.Y)); angle = MathHelper.Lerp(angle, newAngle, (float)gameTime.ElapsedGameTime.Milliseconds / 1000); if (0 < position.Y) RotationMatrix = Matrix.CreateRotationX(MathHelper.PiOver2) * Matrix.CreateRotationZ(MathHelper.Pi - angle); else RotationMatrix = Matrix.CreateRotationX(MathHelper.PiOver2) * Matrix.CreateRotationZ(-1 * angle); } That doesn't work so fine. It seems like it's going to at first, but then it just sort of skips around. How can I achieve what I want here?

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• Webmatrix The Site has Stopped Fix

  - by Tarun Arora

  I just got started with AzureWebSites by creating a website by choosing the Wordpress template. Next I tried to install WebMatrix so that I could run the website locally. Every time I tried to run my website from WebMatrix I hit the message “The following site has stopped ‘xxx’” Step 00 – Analysis It took a bit of time to figure out that WebMatrix makes use of IISExpress. But it was easy to figure out that IISExpress was not showing up in the system tray when I started WebMatrix. This was a good indication that IISExpress is having some trouble starting up. So, I opened CMD prompt and tried to run IISExpress.exe this resulted in the below error message So, I ran IISExpress.exe /trace:Error this gave more detailed reason for failure Step 1 – Fixing “The following site has stopped ‘xxx’” Further analysis revealed that the IIS Express config file had been corrupted. So, I navigated to C:\Users\<UserName>\Documents\IISExpress\config and deleted the files applicationhost.config, aspnet.config and redirection.config (please take a backup of these files before deleting them). Come back to CMD and run IISExpress /trace:Error IIS Express successfully started and parked itself in the system tray icon. I opened up WebMatrix and clicked Run, this time the default site successfully loaded up in the browser without any failures. Step 2 – Download WordPress Azure WebSite using WebMatrix Because the config files ‘applicationhost.config’, ‘aspnet.config’ and ‘redirection.config’ were deleted I lost the settings of my Azure based WordPress site that I had downloaded to run from WebMatrix. This was simple to sort out… Open up WebMatrix and go to the Remote tab, click on Download Export the PublishSettings file from Azure Management Portal and upload it on the pop up you get when you had clicked Download in the previous step Now you should have your Azure WordPress website all set up & running from WebMatrix. Enjoy!

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