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Articles indexed Thursday March 18 2010

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• Convert wife/husband/partner to a programmer.

  - by Stefan

  originally posted by Stefan: How many of you have had the thought of educate your partner and invite him/her to the beautiful world of programming? I once started to give my wife lessons twice a week, It was a competition between me and another programmer, we thought it would be nice to have our wives understand why we work as programmers and also have it as a hobby sitting all night long. Maybe we could get our wives to feel the power too? After a couple of months my wife didn't like the idea any more, it was too hard to understand she thought, same for my friends wife. So now we are thinking of some project that would be too fun for our wives to turn down just to get the spirit up again. It would be nice to hand over a project to my wife, "Can you debug this for me, please? There are some strange error on module xxx." :) Maybe I'm crazy, what do you think?

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• WPF: Updating visibility of controls not updating the screen

  - by Brad McBride

  I will preface this by stating that I am new to WPF programming and may be making multiple errors. Any insight that can be provided to help me improve in my skills are greatly appreciated. I am working with a WPF application and am looping through a list of objects that contain properties that describe a document that should be built on the fly and automatically printed. I am attempting to display a small grid in the interface that shows the document being built before it is printed. This serves two purposes: one, it allows the user to see work being done by the application. Two, it renders the items on the screen so that I can then have something to actually print since WPF appears to not be able to load an image for printing dynamicaly without displaying it on the screen. In my code, I am setting the various elements in the grid and setting the visibility to visible. However, the UI is not updating and the printed document doesn't look as intended since the image never shows up on the screen. Here is the XAML that I have set up <Grid x:Name="LayoutRoot" Background="Black"> <Grid Name="previewGrid" Grid.Row="1" Grid.Column="1" Background="White" Visibility="Hidden"> <Canvas Name="pageCanvas" HorizontalAlignment="Center" VerticalAlignment="Center"> <Grid Name="pageGrid" Width="163" Height="211"> <Grid.ColumnDefinitions> <ColumnDefinition Width="81.5"></ColumnDefinition> <ColumnDefinition Width="81.5"></ColumnDefinition> </Grid.ColumnDefinitions> <TextBlock Grid.Column="0" Name="copyright" TextAlignment="Center" HorizontalAlignment="Center" VerticalAlignment="Bottom"></TextBlock> <Image Name="pageImage" Grid.Column="1" HorizontalAlignment="Center" VerticalAlignment="Center"></Image> </Grid> </Canvas> .....canvas for pages 2-4 not shown but structure is the same as for pageGrid..... </Grid> </Grid> </Window> Here is the code behind that is supposed to set the elements. previewGrid.Visibility = Windows.Visibility.Visible pageURI = New Uri(pageCollection(i).iamgeURL, UriKind.Absolute) pageGrid.Visibility = Windows.Visibility.Visible bmp.BeginInit() bmp.StreamSource = getCachedURLStream(cardURI) bmp.EndInit() pageImage.Source = bmp copyright.Text = copyrightText cardPreviewGrid.UpdateLayout() ' More code that prints the visual element pageGrid previewGrid.Visibility = Windows.Visibility.Hidden The code in codebehind loops through a number of times depending on how many different documents the user prints. Basically it builds a visual element for a page, prints an XPS version of it and then builds the next page and prints it, etc. Once all pages have been processed, the job is actually sent to the printer. The only purpose of this application is to let the user print these documents so there is not other task that they can do in the application while the documents print. I thought that putting this task in a background thread would help to update the UI but since I am trying to manipulate items directly on the UI thread it would appear that this option won't work for me. What am I doing wrong here and how can I improve the code so that I can get the behavior that I am trying to achieve?

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• How do I create a custom loop in wordpress that excludes categories listed in theme options

  - by mattloak

  I have a custom loop that excludes categories using this code: query_posts(array('category__not_in' => array(2,6))); Instead of specifying the categories to exclude in the code, I'd like to be able to set the option in my custom theme options menu. The code to call the option is get_option('ex_cats');. How do I call this in my query_posts statement?

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• Command to zip a directory using a specific directory as the root

  - by Slokun

  I'm writing a PHP script that downloads a series of generated files (using wget) into a directory, and then zips then up, using the zip command. The downloads work perfectly, and the zipping mostly works. I run the command: zip -r /var/www/oraviewer/rgn_download/download/fcst_20100318_0319.zip /var/www/oraviewer/rgn_download/download/fcst_20100318_0319 which yields a zip file with all the downloaded files, but it contains the full /var/www/oraviewer/rgn_download/download/ directories, before reaching the fcst_20100318_0319/ directory. I'm probably just missing a flag, or something small, from the zip command, but how do I get it to use fcst_20100318_0319/ as the root directory?

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• ListView and dynamic row sizes

  - by misbell

  I'd like to use different row descriptors (from the XML layout resource) in one ListView. Can I and how? Also, I'd like to be able to programmatically change the size of the rows, based on the data in each row, in a ListView. Can I and how? Thank you in advance--I LOVE stackoverflow. M

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• Retrieve MS SQL database or table struture in XML

  - by clutch

  Is there a way to export the database schema in well formed XML of a MS 2000 SQL Server. I'm looking for just the structure not the data and the more detailed the better. The XML may be used in a migration processes. I'm more familiar with MySQL then with SQL Server so please be detailed if you hav time. Thanks

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• Heartbeat (Linux HA) and NetApp?

  - by Drew

  Does anyone have any experience setting up a high availability two node Linux cluster using heartbeat (linux-ha.org) and NetApp storage (preferably using SnapDrive for Linux)? Basically I would like to mount the same NetApp LUN over Fibre Channel to two servers in an Active/Passive mode (only one server can access the LUN at a time) Thanks!

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• System freezes during boot process

  - by slugster

  Hi everyone, i have a machine running Win7 Ultimate. It was running fine, then it just froze - all the stuff i was doing was still on the screen, but mouse and keyboard input was ignored, any animation that was happening on the screen stopped, the machine literally just froze. So i rebooted (power off button), from then on the machine will reboot, but it ultimately freezes again. The instance when this happens will vary - i have made it as far as the Windows login screen, but mostly it will do the POST, then give me the option to press F1 to continue or Del to enter BIOS settings (but of course pressing a key has no effect - it's frozen!). I have disconnected everything not necessary for the boot process, the only peripheral that remains attached is the keyboard. (even the network cable is disconnected). Prior to this the machine was operating fine. The install of Win7 is only 2 days old, and it was a fresh reinstall (i.e. not an upgrade or repair). Can anyone give me an indication of what may be wrong here? I'm not sure if this question should be here or on SuperUser, please migrate it if i have chosen the wrong board.

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• Can you download bluetooth onto your computure?

  - by spider151

  i dont have bluetooth on my computure when my friend does, i want it

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• php define variable inside str_replace array

  - by john

  I have a template system, that replaces text such as {HEADER} with the appropriate content. I use an array like this, that replaces the key with the value using str_replace. $array = array("HEADER","This is the header"); foreach($array as $var => $content) { $template = str_replace("{" . strtoupper($var). "}", $content,$template); } Now im trying to use a defined variable like this: define("NAME","Site Name"); Inside the value for the header. So I want the defined variable to be inside the array which gets replaced so it would look like this, but it doesn't work. $array = array("HEADER","Welcome to ".NAME."'s website!"); Any ideas? tell me if im not clear

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• Turn Bluetooth On and Off in Andriod 1.5 (SDK level 3)?

  - by pcm2a

  There are tons of pay and free bluetooth toggles on the market that work with Android 1.5 (SDK level 3). The problem is there is no visible API for this! Does anyone have any working code snippits on how to enable and disable bluetooth that works on Android 1.5? I assume you must have to use some kind of reflection for it. There are some examples over on anddev.org, but they only work with Android 1.1 or lower. This is for Android 1.5 (SDK level 3) and not Android 2.0 or greater. In Android 2.0 or later Google added easy to use APIs.

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• Java Library: Command Line Option Parser

  - by Zombies

  Anyone know of a library that handles parsing arguements passed from the command line (IE: args[] in public static main).

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• Is there a more expressive way of executing SQL query using Qt?

  - by ShaChris23

  I currently have this code: // Construct query QString const statement = QString("drop database if exists %1") .arg(databaseName_); QSqlQuery query(db); query.exec(statement); Is there a better way to code than the above? Specifically, I dont like how I use QString for SQL statement. It'd be nice if Qt has some class so that I could do something like: // Construct query QSomeClass statement = "drop database if exists %1"; statement.setArg(1, databaseName_); // Replace all %1 in the original string. QSqlQuery query(db); query.exec(statement);

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• Convert/View PowerPoint file into/in Silverlight

  - by Mohit Deshpande

  I have a game of jeopardy that I made in PowerPoint and I was wondering if I could have a Silverlight application read the ppt file. Or is there a way to convert a .ppt file to a Silverlight readable format?

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• EJB3 Remote vs Webservices, performances?

  - by HerQuLe

  Hello I'm planning to a webapp where every guy using it would have a client that would run computations on its computer (because these computations can't be done on the server, too much load...), and then send results to the server. I guess there will be lot of people interested in my application and that's why i'm wonder if my architecture is good and if i'll be able to handle thousands of people. I'm planning to expose remote EJB through JNDI with Glassfish server, so 1000 people could use these EJB at the same time (i guess there could be 5-50 requests / second) to retrieve the data needed for local computation, and then to send the results... Is it expensive to expose EJB to many clients? Would it be better to use webservices, rmi, another solution? Would you recommend me another architecture for what i'm going to do?

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• ID/Class Selector

  - by Ionut Staicu

  Hi. I have some kind of problem with jQuery selectors. Let's say i want to select $('#elementID') but the elementID is a variable. There is any other possiblity to do this other way than var variable = elementID; $('#'+variable) ? I mean without specifying the # anywhere else? Thanks!

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• Timeout a NSThread after a certain amount of time

  - by Zen_silence

  Hello, I have a NSThread that i would like to timeout after a certain amount of time. [NSThread detachNewThreadSelector:@selector(someFuntion) toTarget:self withObject:nil]; - (void) someFunction { //Some calculation that might take a long time. //if it takes more then 10 seconds i want it to end and display a error message } Any help you can provide on this would be greatly appreciated. Thanks, Zen_silence

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• Trouble getting Android emulator to run in eclipse

  - by Sharonix

  Hi there, I'm new to Android and Eclipse. I'm Trying to run the SDK Samples on the Emulator in Eclipse 3.5 Most of the time the AVD Manager hangs when I try to create a new AVD. When I manage to create an AVD and try to start the emulator I get this: emulator: ERROR: no search paths found in this AVD's configuration weird, the AVD's config.ini file is malformed. Try re-creating it. I'm running the latest version of the SDK on Win7 32 bit. Any Ideas?

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• ASP.NET MVC Html.RouteLink

  - by gilbertc

  I am trying to understand what this RouteLink does. Say, in my Global.asax, I have the default route for MVC routes.MapRoute( "Default", // Route name "{controller}/{action}/{id}", // URL with parameters new { controller = "Home", action = "Index", id = "" } // Parameter defaults ); and on a View page, I do <%=Html.RouteLink("Dinners", "Default", new { controller="Dinners", action="Details", id="1"} %> Why it does not generate the link /Dinners/Details/1 but thrown an exception? Thanks. Gil.

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• Instruction for installing an environment with Eclipse, Qt, and Qt integration with eclipse.

  - by Narek

  I want to use Qt lib but I don't know how to install Eclipse+Qt+Qtintegration. I have read some forums, that step by step tell what to download, where to download from, and then what to do. But that was for old versions of mentiond products. I ask to Qt developers tell me the way to install these items on Windows. Any forum or site will be fine. Thanks.

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• Images saved with D3DXSaveSurfaceToFile will open in Paint, not Photoshop

  - by bsruth

  I'm using D3DXSaveSurfaceToFile to save windowed Direct3D 9 surfaces to PNG, BMP and JPG files. There are no errors returned from the D3DXSaveSurfaceToFile call and all files open fine in Windows Photo Viewer and Paint. But they will not open in a higher end image editing program such as Paint Shop Pro or Photoshop. The error messages from these programs basically say that the file is corrupted. If I open the files in Paint and then save them in the same file format with a different file name, then they'll open fine in the other programs. This leads me to believe that D3DXSaveSurfaceToFile is writing out non-standard versions of these file formats. Is there some way I can get this function to write out files that can be opened in programs like Photoshop without the intermediate step of resaving the files in Paint? Or is there another function I should be using that does a better job of saving a Direct3D surfaces to an image?

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• Building URL or link in REST ASP.NET MVC

  - by AWC

  I want to build a URL at runtime when a resource is render to either XML or JSON. I can do this easily when the view is HTML and is rendering only parts of the resource, but when I render a resource that contains a links to another resource I want to dynamically generate the correct URL according the host (site) and resource specific URI part. <components> <component id = "1234" name = "component A" version = "1.0"> <link rel = "/component" uri="http://localhost:8080/component/1234" /> </component> <components> How do I make sure the 'uri' value is correct?

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• Log4j: How filter out messages from a specific class?

  - by BestPractices

  I want to configure my log4j logging to not log messages that are 1) coming from a specific class and 2) of a specific severity i.e. WARN. Can someone provide sample configuration/code on how to do this?

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• How to create a label inside an <input> element?

  - by collimarco

  Hi! I would like to insert a descriptive text inside an input element that disappers when the user click on it. Example I know it is a very common trick, but I do not know how to do that.. What is the simplest/better solution?

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• How to identify HTML elements (in javascript) in a browser agnostic fashion

  - by gatapia

  Hi All, I need to identify all html elements on a page in a browser agnostic fashion. What I am basically doing is using mouse events to record clicks on the page. I need to record which element was clicked. So I add a mouse down listener to the document.body element. And on mouse down I get the element under the mouse. Lets say its a div. I then use the index of that div inside the document.getElementsByTagName('*') nodelist and the nodeName ('div') to identify that div. A sample element id would be div45 which means its a div and its the 45th element in the '*' nodelist. This is all fine and good until I use IE which gives me different indexes. So div45 in FireFox may be div47 in IE. Anyone have any ideas? I just need the id of all elements on the page to be the same in any browser, perhaps indexing is not good enough but I really don't have any more ideas. Thanks Guido

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