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• Print to file in Black and White (but not in greyscale) [not printer specific]

  - by user2413

  Hi all, I have these pdf files of c++code and they are colored which would be cool, except that the network printer here is b&w and the printed out codes come in various shades of pale grey which makes them essentially unreadable (specially the comments). I would like everything (text, codes, commands,...) to be printed in the same (black) color. i've tried fuddling with the printer's properties, but the closest thing i see is the 'level of grey' tab, and there i have the choice between 'enhanced' and 'normal' (and it doesn't make a difference in my case). i've tried 'print to file', but i don't see any options there to print to b&w, I've tried installing the 'generic cups printer', but again no options to print to b&w. any idea ? (i'm on 10.10)

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• How do I recover a site after WordPress' Automatic Update has failed?

  - by Metacom

  I manage several WordPress websites, and successfully recently used the Automatic Upgrade feature to bring them up to 3.1. However, on one of the sites, I received a 503 (I believe it was 503). After that I was presented with "The service is unavailable." whenever I tried to access any page, including the index page, wp-admin, etc. I had similar problems before when a WordPress site got stuck in maintenance mode, and all I needed to do was login via FTP and rename or delete the .maintenance file. I tried that in this case, but that didn't do the trick. I am now presented with "Fatal error: Call to undefined function require_wp_db() in **\wp-settings.php on line 71" I can't figure out how to fix this problem, and I was wondering if anyone else had any ideas. Any suggestions are appreciated! Thank you for reading.

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• Wi-Fi connections gets Idle

  - by marcocamejo

  I am having this terrible problem. I have read a lot of people getting disconnected from the Network, it is not my case, I don't get disconnected, the connection just gets "idle" most of the time. It only works for short periods of time (seconds, a couple of minutes at most), then gets dead, then works again, and so on. It is annoying. I am using Ubuntu 11.10 on a Dell M5030 laptop. I have Windows 7 installed too, and of course with it, the wifi works perfectly. Any idea? advice?

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• unable to start regionservers in HBase

  - by amsal

  I have a problem starting regionservers on slave PCs. When I enlist only master PC in conf/regionservers everything works fine but when I add two more slaves to it the hbase does not start. If I delete all hbase folders in the tmp folder from all PCs and then start regionserver (with 3 regionservers enlisted) the hbase gets started but when I try to create a table it again fails (gets stuck). I am using hadoop 0.20.0 which is working fine and hbase 0.92.0. I have 3 PCs in cluster, one master and two slaves. Also tell that is DNS (both forward and backward lookup working) necessary for hbase in my case? Is there any way to replicate hbase table to all region servers? I.e. I want to have a copy of table at each PC and want to access them locally (when I execute map task they should use their local copy of hbase table).

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• If I have true i/o false or vice versa, is it an OBOE?

  - by Protector one

  I often make the mistake of inverting my truth values in my code (e.g. in my if clauses). It gives me the same feeling as when making an OBOE (Off By One Error), even though it's technically not. Would you call it an OBOE, or better yet, is there a specific term for "off by truth value"-errors? My reasoning is that all possible values of a boolean are true and false. In other words, the possible values are contained in the array: [true, false]. If you access this array by index, you'll always be off by one… when selecting the wrong one. This becomes especially obvious when you calculate your index as: index = someInt % 2. Now I understand that this usually not the case, but in my mind, it always feels like this. Almost got it, just off by one…

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• Why does the installer freeze at the moving dots?

  - by Kits

  I plan to install Ubuntu as the sole operating system on my old Dell Latitude 110L and the install freezes at the Ubuntu starting dots - it doesn't even get to the point where it asks if you want Ubuntu as the sole operating system. I've tried different USB sticks, and now two different CDs. I even re-formatted the C drive on the old Dell and re-installed a fresh copy of Windows in case there was any interfering junk. Still can't get past the dots. I've done this on other computers without a problem - any advice?

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• Can we have some "coming soon" text in our app? Will Apple reject it? [closed]

  - by Pedro

  We're getting ready to push our app live. There's some functionality that's not ready yet; it's accessory, not crucial to the user, but it does provide some interesting context. If I have a button with the name of the feature (e.g., "Panoramic Views") and a "COMING SOON" label stuck over it, will Apple reject the submission? What if instead of a button it's just a text label somewhere announcing "Panoramic Views coming soon!"? I've seen some material online saying that "coming soon" is a no-no but all I could find in Apple's guidelines themselves was 2.9, "Apps that are "beta", "demo", "trial", or "test" versions will be rejected". Which is certainly not the case! Thanks in advance, any help greatly appreciated.

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• Impact of migrating home page from http to https on search results

  - by 2Stroke SEO

  Guys - I've just had to change one of my site's home page to https from http. I had plenty links coming into the http page and was performing well in Google against many of my targeted search phrases. I did a 301 redirect from the http page to transfer the link juice to the https page (and to prevent duplicate content issues), but my search rankings have tanked which indicates no link juice has been transferred. My PR has vanished - which I'd expect - but I'm really surprised that the SERP rankings fell off the face of the earth. Anyone have any ideas how I can recover this. I've waited a couple of months since the changes took effect just in case Google was taking time to check it out.

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• What steps should be taken to ensure that an open source database gets ready for production?

  - by I_like_traffic_lights

  I am considering using GridSQL in a production environment. However, I do have some indications that it is not ready. One is that it got excluded by the offering of EnterpriseDB a while ago, and the forums seem to report a few wrong results and relatively severe bugs. The alternatives to GridSQL, however cost around 100.000$ to buy, so I was thinking to utilize some of this money to ensure that GridSQL gets ready for production. At the same time, I could risk spending 50.000$ and months of work on the development of GridSQL, just to discover that the design was flawed and that a complete rewrite is needed. Then I would have to buy the commercial alternatives to GridSQL and the existence of my startup would be at risk. Question What steps would you take to ensure that there is as little risk as possible that the worst case scenario described above would happen? It is unrealistic that I could do much testing nor code review/coding myself (I am also not the best developer), so please describe where to find the guys that would need to do the work.

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• Silverlight 3.0 and ADO.NET data service framework(An error occurred while processing this request)

  - by ybbest

  Today , I try to write a Silverlight app that talks to SharePoint 2010 using the REST API.However after deploy the silverlight app and run the code , I got the following error.In order to fix this I need to make the target framework of your caller application to 4.0,in this case I need to use Silverlight 4.0 instead 3.0.After I have done that and redeploy the solution to the SharePoint.It works like a charm.   Exceptions details: System.Data.Services.Client.DataServiceQueryException: An error occurred while processing this request. Request version ’1.0′ is too low for the response. The lowest supported version is ’2.0′. However , if you got the error like this: Could not load type ‘System.Data.Services.Providers.IDataServiceUpdateProvider’ from assembly ‘System.Data.Services, Version=3.5.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089′,then you need to install ADO.NET Data Services Update for .NET Framework 3.5 SP1 ,you can download here (for windowns 7 and server 2008 r2 ) or here (for windows vista of server 2008).

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• How can I remap my keys to act like the Macintosh keyboard (like hold alt l + l click = r click)?

  - by jaorizabal

  I want my keyboard layout to act like a Macintosh keyboard. It's hard to use my computer after years on a mac. I want to disable my right mouse click, and replace it with alt + right mouse click. The alt key will also act like ctrl. I want my left ctrl to be the HUD key. I still want my super key to be the same. Can someone please make a script, or point me in the direction of a program to do all this with ease. If you were to make a script/whatever, can you please make one what will reverse all keyboard changes in-case I feel that it is not the same. I will add to the post if I miss anything. Thank you.

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• What could a kernel mode driver be possibly useful to?

  - by John Pell

  This might sound weird but there's an explanation for my question: I want to write something to impress a potential recruiter, and I want (to strenghten my skills) to create a program which should communicate with kernel mode driver(s). I'm not starting from a goal and trying to design the system to achieve it, I'm doing the opposite: designing the system and trying to justify it with a meaningful goal. So here comes the question: what could a kernel mode driver be possibly useful to? The answers that come to my mind right now are: I might want to communicate with hardware (not really my case, it's a software project mainly) I might want to mess around with the OS (security/hooking?) ?? I need some other examples like those

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• Distinguishing between sets of status reports

  - by user1769486

  I am working on an internal database monitoring system and am at a point where I sort of hit the wall in terms of application design. Basically I have an extensible plugin architecture where I shall have an OK, a warning or an error upon running a db verification. My first question whether it is sufficient to have only one status reported with an optional status message or provide the ability to have more than one returned (with attached messages) and then calculate an aggregated overall status. In particular in the latter case my second issue would be how to distinguish between two verification reports with the same status code (as it can come from different triggers). I would need to do this to see whether some change happened between the current and last verification. I could simply have string comparisons of the attached status messages mentioned above but that does not seem very reliable.

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• Tilgin Improves Subscriber Device Management with Embedded MySQL

  - by Bertrand Matthelié

  Tilgin IPRG AB develops and delivers systems and software for the digitally-connected home. Using Tilgin home gateway software, as well as central software for remote control and operation of the network, Tilgin’s customers can offer their subscribers broadband services. The company has over 100 customers,  telecommunications and broadband operators, in more than 30 countries.Tilgin needed a robust and scalable database solution for its auto-configuration server (ACS) product, tGem, used by its customers to manage the devices that provide their subscribers with access to television, internet, telephony, and other services. Tilgin chose MySQL as embedded database. This made it possible for Tilgin’s customers to easily and smoothly implement new generations of services, as well as to easily add new subscribers, ultimately enabling the company to save time and money. Read the case study here.

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• Sudden Breakthroughs (Miracles at work)

  - by MobileDev123

  Lot of things has been discussed that can be taken as negative things about programmers work. Lets discuss about something good and unexpected things that happen to programmers. Example: (After R&D of two days and a lot of disappointments) You just spend an hour with your PM to explain that some feature due to some problem you are unable to release this module in today's beta... after a lot of arguments you are given an hour to make your app work without this module. You sit on your workstation to make a release and all of a sudden you find what turns out to be a silly little problem.... (you solve it and prepare a desired build) did you face miracle (= sudden, positive surprises?) in your life?? what was your reaction in case you have come through such experience?? (N.B. I know my English is not that good and that's why I'm open to every linguistic mistakes needed to be corrected)

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• How do I correctly multiply an XMMATRIX by a scalar?

  - by user43129

  Using DirectXMath and its XMMATRIX structure in C++ and Direct X 11, how does one multiply that matrix structure by a single float scalar? I want to implement the operation B = A * f; where A and B are XMMATRIX and f is a float. I found all sorts of functions to multiply a matrix by another matrix or a vector. I found all sorts of functions to construct matrices. I could find no scalar multiplication! Why is there no such function? Is there no use case? Did I miss something? How do I implement scalar multiplication?

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• Building a touch event driven UI from scratch: what algorithms or data types?

  - by user1717079

  I have a touch display. As input I can receive the coordinates and how many touch points are in use, basically I just get an X,Y couple for every touch event/activated point at a customizable rate. I need to start from this and build my own callback system to achieve something like Object.onUp().doSomething() meaning that I would like to abstract just the detection of some particular movements and not having to deal with raw data: what algorithms can be useful in this case? What statements? Is there some C++ library that I can dissect to get some useful info? Would you suggest the use of an heuristic algorithm?

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• update(100) behaves slightly different than 10 times update(10) - is that a problem? [on hold]

  - by futlib

  While looking into some test failures, I've identified an curious issue with my update logic. This: game.update(100); Behaves slightly different from: for (int i = 0; i < 10; i++) game.update(10); The concrete example here is a rotating entity. It rotates by exactly 360 degrees in the first case, but only by about 352 in the second. This leads to slight variations in how things move, depending on the frame rate. Not enough to be noticeable in practice, but I did notice it when writing tests. Now my question is: Should this be fully deterministic, i.e. the outcome of update(1) * n should equal update(n) exactly? Or is it normal to have some variance and I should make my test assertions more generous?

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• Binding to Silverlight ComboBox and Using SelectedValue, SelectedValuePath and DisplayMemberPath

  How do you bind a ComboBox to a collection of objects, and then bind a property from the selected objects to some other scalar property? I received this question today from a friend of mine (a variation of this question). I decided to walk through the scenario here in case anyone else runs into it. This is one of those things that can be confusing it is simple, but it is is much easier shown the explained. This post lays out the scenario and you can download the sample code at the end. When we...Did you know that DotNetSlackers also publishes .net articles written by top known .net Authors? We already have over 80 articles in several categories including Silverlight. Take a look: here.

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• Is is OK to use a non-primary key as the id in a rails resource?

  - by nPn

  I am getting ready to set up a resource for some new api calls to my rails application. I am planning on calling the resource devices ie resources :devices This is going to represent a android mobile devices I know this will get me routes such as GET devices/:id In most cases :id would be an integer representing the primary key, and in the controller we would use :id as such: GET devices/1 @device = Device.find(params[:id]) In this case I would like to use :id as the google_cloud_messaging_reg_id So I would like to have requests like this: GET devices/some_long_gcm_id and then in the controller , just us params[:id] to look up the device by the gcm registration id. This seem more natural, since the device will know it's gcm id rather than it's rails integer id. Are there any reasons I should avoid doing this?

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• Initialize array in O(1) -- how is this trick called?

  - by user946850

  There is this pattern that trades performance of array access against the need to iterate it when clearing it. You keep a generation counter with each entry, and also a global generation counter. The "clear" operation increases the generation counter. On each access, you compare local vs. global generation counters; if they differ, the array has been reset. This has come up in StackOverflow recently, but I don't remember if this trick has an official name. Does it? One use case is Dijkstra's algorithm if only a tiny subset of the nodes has to be relaxed, and if this has to be done repeatedly.

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• No panels at all after upgrading from 10.04 to 12.04

  - by user86330

  After upgrading to 12.4 from 10.4 on an AMD64 the situation is as follows: After booting I see the Xubuntu logo splash screen and when I log in I get an error that there is a system crash somewhere (it suggest to click on the notification icon, but no info appears then). FInally I can only see my initial 10.04 Desktop but I have no panels at all, so I can only click on my Desktop objects. Question: Will a clean re intall solve the problem? In such case will my multi partition configuration (Vista+XP+ubuntu partitions) be affected?

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• Testing complex compositions

  - by phlipsy

  I have a rather large collection of classes which check and mutate a given data structure. They can be composed via the composition pattern into arbitrarily complex tree-like structures. The final product contains a lot of these composed structures. My question is now: How can I test those? Albeit it is easy to test every single unit of these compositions, it is rather expensive to test the whole compositions in the following sense: Testing the correct layout of the composition-tree results in a huge number of test cases Changes in the compositions result in a very laborious review of every single test case What is the general guideline here?

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• Filling up the empty blocks when the player touches the safe zone again! using cocos2d

  - by user3445020

  Hi guys i am stuck with filling up the data of all the blocks which are empty like the ones in the image. As you can see there i have a pacman like object where i will be moving around. But when you are in the empty space where there are no Blue boxes available i should be able to add new blocks in the path of my pacman and when it touches any other blue boxes like in the below case if my pacman touches the top row of the blue box i should be able to fill all the empty boxed inside the border of the path created by pacman. For now i am using a 2d bool array to store all the filled boxed info like if there is a box inside i am making that cell in an array as true. But how to fill the area with blue boxes after player finishes his path ? Any help would be great thank you. More info about this problem is here: filling the empty spaces in a certain region in a grid using c++ Same problem

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• How to draw a map for the game?

  - by user36689

  I wanted to make a small game, it will be about space. But I had a couple of questions, how to draw a map for the game? I would like to have lots of planets, possible consolidation of the system (as the solar system) But how to draw these planets? Is it really necessary to draw them by hand? I plan to give the names of the planets, but maybe I will not do what is best to do? Prompt Council Help me, please) I'm sorry if that is not the case)) Thanks in advance!

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