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Articles indexed in March 2010

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  • Elegant way of parsing Data files for Simulation

    - by sc_ray
    I am working on this project where I need to read in a lot of data from .dat files and use the data to perform simulations. The data in my .dat file looks as follows: DeviceID InteractingDeviceID InteractionStartTime InteractionEndTime 1 2 1101 1105 1,2 1101 and 1105 are tab delimited and it means Device 1 interacted with Device 2 at 1101 ms and ended the interaction at 1105ms. I have a trace data sets that compile thousands of such interactions and my job is to analyze these interactions. The first step is to parse the file. The language of choice is C++. The approach I was thinking of taking was to read the file, for every line that's read create a Device Object. This Device object will contain the property DeviceId and an array/vector of structs, that will contain a list of all the devices the given DeviceId interacted with over the course of the simulation.The struct will contain the Interacting Device Id, Interaction Start Time and Interaction End Time. I have a two fold question here: Is my approach correct? If I am on the right track, how do I rapidly parse these tab delimited data files and create Device objects without excessive memory overhead using C++? A push in the right direction will be much appreciated. Thanks

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  • Ubuntu Nvidia Xorg Twinview doesnt like my monitors

    - by Andrew Bolster
    Basically, using the latest available ubuntu drivers (195.36.15) I cannot for the life of me get my two monitors to operate at suitable resolutions. When not using the drivers atall and going single-screen, both monitors support 1680x1050, but this option is only shown for one monitor in nvidia-settings, and when i manually add a metamode into the xorg.conf, it just gives up initialising the second screen. (**) Mar 25 15:49:47 NVIDIA(0): TwinView enabled (II) Mar 25 15:49:47 NVIDIA(0): Assigned Display Devices: CRT-0, CRT-1 (II) Mar 25 15:49:47 NVIDIA(0): Validated modes: (II) Mar 25 15:49:47 NVIDIA(0): "1680x1050,1680x1050" (II) Mar 25 15:49:47 NVIDIA(0): Virtual screen size determined to be 1680 x 1050 Any ideas?

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  • Binding keys from specific device in X.org

    - by Michal Cihar
    I have a remote control for presentations, which generates Next/Prior key events in X.org (Page up/down). I'd like to use these for navigating in playlist (using MPD, but it probably does not matter). The problem is that I want to make this control work all the time (without application having focus) and I don't want to lose Page up/down functionality from normal keyboard. Is there some application which would allow me to bind actions to events from specific keyboard? Or is there simple way to implement such thing on my own?

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  • Why do I get this error "EMCIDeviceError" when opening some wav files in my program.

    - by Roy
    Hey I have this program that has been working fine until I tried to open this one wav file? Not sure what the problem is or that I understand it? Do I need to find a new component to use for this file or what? I am using Delphi 4 Pro and the standard VCL component for Media Player. I am looking for a good new component that offers more help with wav and mp3 files too but not found what I am looking for yet?

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  • WinForms: How to determine if window is no longer active (no child window has focus)?

    - by Marek
    My application uses multiple windows I want to hide one specific window in case the application loses focus (when the Active Window is not the application window) source I am handling the Deactivate event of my main form. private void MainForm_Deactivate(object sender, EventArgs e) { Console.WriteLine("deactivate"); if (GetActiveWindow() == this.Handle) { Console.WriteLine("isactive=true"); } else { Console.WriteLine("isactive=false"); } } [DllImport("user32.dll")] static extern IntPtr GetActiveWindow(); The output is always deactivate isactive=true I have observed the same behavior if a new window within my application receives focus and also if I click into a different application. I would expect GetActiveWindow to return the handle of the new active window when called from the Deactivate handler. Instead it always returns the handle of my application window. How is this possible? Is the Deactivate event handled "too soon"? (while the main form is still active?). How can I detect that my application has lost focus (my application window is not the active window) and another application gained it without running GetActiveWindow on a timer?

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  • Stubbing ActiveRecord result arrays

    - by Matthias
    Using Ruby 1.8.6, stubbing a finder method to return an Array does not work when the code under test calls the 'count' method on the result: User.any_instance.stubs(:friends).returns([user1, user2]) That's because Array.count has only been added in Ruby 1.8.7. Rails also adds a count method dynamically, I believe through the ActiveRecord::Calculations module. Is there any way to turn this result array into something that behaves exactly as the special Array kind returned by a Rails finder method? When paginating results, it's easy: I can simply call [].paginate. But that doesn't work with normal finder results. I tried [].extend(ActiveRecord::Calculations) but that doesn't work either.

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  • FaceBook fan count on website

    - by Sam Beamond
    I'd like to include a within the footer of my website a "facebook fan count". I believe this will add an incentive to users considering clicking our facebook icon. "join XXXX fans on our facebook page" for example. I want the XXXX to be automatically populated with our facebook fan count. I want to do the same with twitter. Any insight you can provide would be helpful. Note, I dont want to include the whole FB widget, just need the fan count for this purpose. Thanks

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  • Securing a WCF ASP.NET web service

    - by harekam_taj
    Hey Guys, I have a asp.net website and I am accessing that web service from my iPhone app to get data. The WCF web service produces data as JSON. I want to put some kind of authentication on the WCF. What you you guys recommend? Thanks

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  • C# double-quoted path name being escaped when read from file

    - by KrisTrip
    I am trying to read in a text input file that contains a list of filenames (one per line). However, I am running into an issue if the user double-quotes the path (because it has a space in it). For example, a normal input file might have: C:\test\test.tiff C:\test\anothertest.tiff C:\test\lasttest.tiff These get read in fine by my code ("C:\\test\\test.tiff" etc) However, if I have the following input file: "C:\test with spaces\test.tiff" "C:\test with spaces\anothertest.tiff" "C:\test with spaces\lasttest.tiff" These get read in double-quotes and all ("\"C:\\test with spaces\\test.tiff\"" etc). This becomes a problem when I try to open the files (I understandably get invalid character exceptions). My question is, how do I fix this? I want to allow users to input quoted strings and handle them correctly. My first impression was to just write a little method that strips off beginning or ending quotes, but I thought there might be a better way.

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  • Autocomplete jQuery 1.8-UI JSON Format

    - by Kezzer
    I'm toying with the new autocomplete in jQuery 1.8-UI. I've provided data in the following format ["val1", "val2", "val3"] This is coming from a stored procedure but output as a string. For some reason this doesn't work at all, however, if I supply the same data using a javascript variable var data = ["val1", "val2", "val3"]; Then this works fine. <script type="text/javascript"> $(function() $("#txtClient").autocomplete({ source: "/intranet/common/scripts/IntranetLists.aspx?ListType=C" }); }); </script> I've got a page which supplies whatever data I want using query strings. It's more temporary, but it worked when I previously used bassistence's autocomplete. Any ideas?

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  • PostGreSQL - pgloader installation?

    - by KittyYoung
    Granted... this is a dumb question, but it's still a mystery to someone like me, whose never done it before... I'm trying to install pgloader, but I can't seem to find any documentation.... I'm running MAMP on MAC OS X. I've already installed the tcllib, and am about to do: wget http://pgfoundry.org/frs/download.php/233/pgloader-1.0.tar.gz tar zxvf pgloader-1.0.tar.gz I'm wondering what directory I need to actually untar pgloader into? Is there anything else that I need to do to get it to work?

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  • Web scraping: how to get scraper implementation from text link?

    - by isme
    I'm building a java web media-scraping application for extracting content from a variety of popular websites: youtube, facebook, rapidshare, and so on. The application will include a search capability to find content urls, but should also allow the user to paste a url into the application if they already where the media is. Youtube Downloader already does this for a variety of video sites. When the program is supplied with a URL, it decides which kind of scraper to use to get the content; for example, a youtube watch link returns a YoutubeScraper, a Facebook fanpage link returns a FacebookScraper and so on. Should I use the factory pattern to do this? My idea is that the factory has one public method. It takes a String argument representing a link, and returns a suitable implementation of the Scraper interface. I guess the Factory would hold a list of Scraper implementations, and would match the link against each Scraper until it finds a suitable one. If there is no suitable one, it throws an Exception instead.

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  • What's the difference between !col and col=false in MySQL?

    - by Mask
    The two statements have totally different performance: mysql> explain select * from jobs where createIndexed=false; +----+-------------+-------+------+----------------------+----------------------+---------+-------+------+-------+ | id | select_type | table | type | possible_keys | key | key_len | ref | rows | Extra | +----+-------------+-------+------+----------------------+----------------------+---------+-------+------+-------+ | 1 | SIMPLE | jobs | ref | i_jobs_createIndexed | i_jobs_createIndexed | 1 | const | 1 | | +----+-------------+-------+------+----------------------+----------------------+---------+-------+------+-------+ 1 row in set (0.01 sec) mysql> explain select * from jobs where !createIndexed; +----+-------------+-------+------+---------------+------+---------+------+-------+-------------+ | id | select_type | table | type | possible_keys | key | key_len | ref | rows | Extra | +----+-------------+-------+------+---------------+------+---------+------+-------+-------------+ | 1 | SIMPLE | jobs | ALL | NULL | NULL | NULL | NULL | 17996 | Using where | +----+-------------+-------+------+---------------+------+---------+------+-------+-------------+ Column definition and related index for aiding analysis: createIndexed tinyint(1) NOT NULL DEFAULT 0, create index i_jobs_createIndexed on jobs(createIndexed);

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  • Protecting Data Feed for iPhone App

    - by Chris
    I am creating an App that pulls data from a file on my server. That file gets data from my database, based on GET values that are passed through the URL. I would like to keep this feed closed - that is, I don't want people finding the datasource and reading the data on their own. I considered sending an alphanumeric id along with the url string, but if they can find the URL that I am calling, then there won't be anything preventing them from grabbing that alphanumeric id also. I am looking for any ideas or experiences that might help me here. Thanks.

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  • Defining a variable in a class and using it in functions

    - by Josh
    I am trying to learn PHP classes so I can begin coding more OOP projects. To help me learn I am building a class that uses the Rapidshare API. Here's my class: <?php class RS { public $baseUrl = 'http://api.rapidshare.com/cgi-bin/rsapi.cgi?sub='; function apiCall($params) { echo $baseUrl; } } ?> $params will contain a set of key pair values, like this: $params = array( 'sub' => 'listfiles_v1', 'type' => 'prem', 'login' => '746625', 'password' => 'not_my_real_pass', 'realfolder' => '0', 'fields' => 'filename,downloads,size', ); Which will later be appended to $baseUrl to make the final request URL, but I can't get $baseUrl to appear in my apiCall() method. I have tried the following: var $baseUrl = 'http://api.rapidshare.com/cgi-bin/rsapi.cgi?sub='; $baseUrl = 'http://api.rapidshare.com/cgi-bin/rsapi.cgi?sub='; private $baseUrl = 'http://api.rapidshare.com/cgi-bin/rsapi.cgi?sub='; And even tried $this->baseUrl = $baseUrl; in my apiCall() methid, I don't know what the hell I was thinking there though lol. Any help is appreciated thanks :)

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  • WPF ListView in GridView mode Highlighting problem

    - by xenik
    While reskining GridView (ListView with more columns), I ran into a problem, that I couldn't change the color of the Highlighted row. I searched the internet and found out, that adding this can help. <SolidColorBrush x:Key="{x:Static SystemColors.HighlightBrushKey}" Color="Transparent" /> <SolidColorBrush x:Key="{x:Static SystemColors.ControlBrushKey}" Color="Transparent" /> This solved the issue for some people but it didnt help me. The Highlight color was still in system default. I finally managed to change the color of the selected row, but the highlight is still visible around the border of the row plus i need to get rid of the Highlight in the ColumnHeaders. Heres the code, where my approach doesn't work. sth sthelse

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