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Articles indexed Friday April 16 2010

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  • IRb: how to start an interactive ruby session with pre-loaded classes

    - by Shyam
    Hi, As I am going through my journey by adopting the Ruby language, I spend a lot of time inside IRb. It's just fantastic! But, as I am not very aware of it's capabilities, and still a nuby with Ruby, I would like to know the following: How can I 'flush' the session, without restarting IRb (or is this not possible). How can I configure IRb to load a bunch of source files "hello.rb" and "hello_objects.rb", i.e. at startup? I am heavily working in these and it would be nice to know a short hand to load these classes, without manually typing 'load' for each again. Thank you for your answers, comments and feedback!

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  • Adding a ActionPerformed Array to a String Array

    - by user267490
    Hey, Before you guys ask, yes I've searched online for the answer, but everything I found just leaves a lil confuse and nothing is recent so asking in those forums won't really help. My problems is this: I have an array that holds my name for a menu. String[] fontColor = new String[] {"Red", "Blue", "Green"}; for (int i = 0; i < fontColors.length; i++) { JMenuItem fontC = new JMenuItem(fontColors[i]); fontC.addActionListener(new fontColorAction()); changeFontColor.add(fontC); } Then I have an array that holds my color change in a class called fontColorAction in that class I have another array that does the same thing as my string array except all thats in the statement is textarea.setForeground(colorArr[i]); that will set the setForeground() in order, but now how do I successfully attact the action listner in my class to my menuItems? my class looks like this private class fontColorAction implements ActionListener { Color[] colorArr - new Color[] {"Color.RED","Color.BLUE","Color.GREEN"}; public void actionPerformed(ActionEvent e){ for(i = 0; i < collorArr.length; i++){ textarea.setForeground(colorArr[i]); } } }

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  • MySQL Connection Error in PHP

    - by user309381
    I have set the password for root and grant all privileges for root. Why does it say it is denied? ****mysql_query() [function.mysql-query]: Access denied for user 'SYSTEM'@'localhost' (using password: NO) in C:\wamp\www\photo_gallery\includes\database.php on line 56 Warning: mysql_query() [function.mysql-query]: A link to the server could not be established in C:\wamp\www\photo_gallery\includes\database.php on line 56 The Query has problemAccess denied for user 'SYSTEM'@'localhost' (using password: NO) Code as follows: <?php include("DB_Info.php"); class MySQLDatabase { public $connection; function _construct() { $this->open_connection(); } public function open_connection() { /* $DB_SERVER = "localhost"; $DB_USER = "root"; $DB_PASS = ""; $DB_NAME = "photo_gallery";*/ $this->connection = mysql_connect($DBSERVER,$DBUSER,$DBPASS); if(!$this->connection) { die("Database Connection Failed" . mysql_error()); } else { $db_select = mysql_select_db($DBNAME,$this->connection); if(!$db_select) { die("Database Selection Failed" . mysql_error()); } } } function mysql_prep($value) { if (get_magic_quotes_gpc()) { $value = stripslashes($value); } // Quote if not a number if (!is_numeric($value)) { $value = "'" . mysql_real_escape_string($value) . "'"; } return $value; } public function close_connection() { if(isset($this->connection)) { mysql_close($this->connection); unset($this->connection); } } public function query($sql) { //$sql = "SELECT*FROM users where id = 1"; $result = mysql_query($sql); $this->confirm_query($result); //$found_user = mysql_fetch_assoc($result); //echo $found_user; return $found_user; } private function confirm_query($result) { if(!$result) { die("The Query has problem" . mysql_error()); } } } $database = new MySQLDatabase(); ?>

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  • MSBuild conditionals depending on task parameters

    - by jalf
    In MSBuild it's straightforward to define, say, a PropertyGroup which depends on the value of a property Foo: <PropertyGroup Conditional="'$(Foo)'=='Bar'" /> Is it also possible for the conditional to depend on a task parameter? For example, I'd like to use the value of the Link task's SubSystemparameter roughly like this: <PropertyGroup Conditional="'$(Link/SubSystem)'=='Console'" /> but don't know if it is possible, and if it is, what the correct syntax is. I'm pretty new to MSBuild though, so it's perfectly possible that I've missed something.

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  • When does MSBuild set the $(ProjectName) property?

    - by bwerks
    I'm fairly new to MSBuild, and I've done some customization on a Wpf project file that I'm building both in VS2010 and TFS2010. I've customized the output path as follows: <OutputPath Condition=" '$(TeamBuildOutDir)' == '' ">$(SolutionDir)build\binaries\$(ProjectName)\$(Configuration)\$(Platform)</OutputPath> <OutputPath Condition=" '$(TeamBuildOutDir)' != '' ">$(TeamBuildOutDir)binaries\$(ProjectName)\$(Configuration)\$(Platform)</OutputPath> This allows me to build to a centralized binaries directory when building on the desktop, and allows TFS to find the binaries when CI builds are running. However, it seems that in both cases, the $(ProjectDir) property is evaluating to '' at buildtime, which creates strange results. Doing some debugging, it appears as if $(ProjectName) is set by the time BeforeBuild executes, but that my OutputPath property is evaluating it prior to that point. <ProjectNameUsedTooEarly Condition=" '$(ProjectName)' == '' ">true</ProjectNameUsedTooEarly> The preceeding property is in the same property group as my OutputPath property. In the BeforeBuild target, $(ProjectNameUsedTooEarly) evaluates to true, but $(ProjectName) evaluates to the project name as normal by that point. What can I do to ensure that $(ProjectName) has got a value when I use it? edit: I just used Attrice's MSBuild Sidekick to debug through my build file, and in the very first target available for breakpoint (_CheckForInvalidConfigurationAndPlatform) all the properties seem to be set already. ProjectName is already set correctly, but my OutputPath property has already been set using the blank value of ProjectName.

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  • Which regex flavors support captures (as opposed to capturing groups)?

    - by Tim Pietzcker
    As I just learned from this question, .NET regexes can access individual matches within a repeated capturing group. I. e., if I apply a regex like \b(\w+\s*)+ to a string of words, only the last word will be stored in \1 or Match.Groups(1).Value, but using Match.Groups(1).Captures I get access to all the individual matches the regex iterated over. Are there other regex flavors that support this besides .NET?

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  • UITableViewCellStyleValue2 edit indicators?

    - by Jason Jardim
    I am using this style of table view UITableViewCellStyleValue2. I set editing, but I cant seem to get the arrows to show up on the right of the cell - like the Contacts app. Also in the contacts app I notice that if I have a Favorite it puts a * (star) to the right. Any info on how to get an image would be appreciated. Thanks!

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  • Reverse factorial

    - by dada
    Well, we all know that if N is given it's easy to calculate N!. But what about reversing? N! is given and you are about to find N - Is that possible ? I'm curious.

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  • extern and global in c

    - by JPro
    Can anyone please tell me is there any special requirement to use either EXTERN or GLOBAL variables in a C program? I do not see any difference in a program like below, if I change from gloabl to extern. #include <stdio.h> #include <stdlib.h> int myGlobalvar = 10; int main(int argc, char *argv[]) { int myFunc(int); int i; i = 12; myGlobalvar = 100; printf("Value of myGlobalvar is %d , i = %d\n", myGlobalvar, i); i = myFunc(10); printf("Value of passed value : %d\n",i); printf("again Value of myGlobalvar is %d , i = %d\n", myGlobalvar, i); system("PAUSE"); return 0; } int myFunc(int i) { i = 20 + 1000; //extern int myGlobalvar; myGlobalvar = 20000; // printf("Value of passed value : %d",i); return i; } If uncomment extern int myGlobalvar, the value does not change. Is there any correct difference between both? Can anyone please correct me?

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  • C++ gdb GUI

    - by HappyDude
    Briefly: Does anyone know of a GUI for gdb that brings it on par or close to the feature set you get in the more recent version of Visual C++? In detail: As someone who has spent a lot of time programming in Windows, one of the larger stumbling blocks I've found whenever I have to code C++ in Linux is that debugging anything using commandline gdb takes me several times longer than it does in Visual Studio, and it does not seem to be getting better with practice. Some things are just easier or faster to express graphically. Specifically, I'm looking for a GUI that: Handles all the basics like stepping over & into code, watch variables and breakpoints Understands and can display the contents of complex & nested C++ data types Doesn't get confused by and preferably can intelligently step through templated code and data structures while displaying relevant information such as the parameter types Can handle threaded applications and switch between different threads to step through or view the state of Can handle attaching to an already-started process or reading a core dump, in addition to starting the program up in gdb If such a program does not exist, then I'd like to hear about experiences people have had with programs that meet at least some of the bullet points. Does anyone have any recommendations? Edit: Listing out the possibilities is great, and I'll take what I can get, but it would be even more helpful if you could include in your responses: (a) Whether or not you've actually used this GUI and if so, what positive/negative feedback you have about it. (b) If you know, which of the above-mentioned features are/aren't supported Lists are easy to come by, sites like this are great because you can get an idea of people's personal experiences with applications.

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  • SQL CHECK constraint issues

    - by blahblah
    I'm using SQL Server 2008 and I have a table with three columns: Length, StartTime and EndTime. I want to make a CHECK constraint on this table which says that: if Length == NULL then StartTime <> NULL and EndTime <> NULL else StartTime == NULL and EndTime == NULL I've begun to try things like this: Length == NULL AND StartTime <> NULL AND EndTime <> NULL Obviously this is not enough, but even this simple expression will not validate. I get the error: "Error validating 'CK_Test_Length_Or_Time'. Do you want to edit the constraint?" Any ideas on how to go about doing this?

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  • .NET Com Interopability

    - by Kottan
    I have a C# class X which inherits from class Y. Class X should be Com-Visible (should be used in an old Vb6 application). It is neccessary to use some Types of class Y in the VB6 application. How can I make them also COM-visible (without changing class Y) ?

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  • How to define using statements in web.config?

    - by Hasan Gürsoy
    I'm using MySql in my asp.net project. But I don't want to type every "using MySql.Data.MySqlClient;" statement in every aspx.cs file. How can I define this lines in web.config file? I've defined some namespaces like below but this only works for aspx pages: <?xml version="1.0"?> <configuration> <system.web> <compilation debug="false" targetFramework="4.0"/> <pages> <namespaces> <add namespace="System.Web.Configuration"/> <add namespace="MySql.Data"/> <add namespace="MySql.Data.MySqlClient"/> </namespaces> </pages> </system.web> </configuration>

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  • How to determine which class has called a function

    - by dannyc
    Hi, I am working on a Flex Front End at the moment, and have been using the Parsley framework for passing messages/events around. I was wondering if there is a simple way for a function (in this case, an event's constructor) to obtain a reference to the object which called it? This is to ensure that a certain event that I am defining can only be dispatched by one specified class. My thinking is to check the caller of the constructor somehow, and throw an error if it is not of the correct type. I am open to suggestions of alternative approaches here, but I would ideally like to stick to using the Parsley 'MessageHandler' approach if at all possible. Thanks for reading guys..

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  • OSX problem starting FTP from preferences

    - by Xetius
    When I try to enable the FTP service in the preferences (File Sharing-Options-Share Files and Folders Using FTP) the check box enables and then disables again. The console is giving me the message : 16/04/2010 12:14:20 com.apple.coreservicesd[51] sh: launchctl: command not found This indicates to me that it can't find the launchctl executable launchctl is present in the folder /bin /bin is set in the PATH variable for sh and bash shells and also in the ~/.MacOS/environment.plist How can I fix this so that my preferences can find this so that I can enable the FTP service.

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  • Getting Started with Silverlight 4

    Silverlight 4 RC2 is available to download now. It works with Visual Studio 2010. First, you need to download and install Visual Studio 2010. Here are some getting started points and resources related to Silverlight 4.

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  • Convert TCHAR* argv[]

    - by sijith
    i want to enter a text into TCHAR* argv[], how its possible to do. OR how to convert from a charater to TCHAR* argv[]. Please help char randcount[]="Hello world"; want to convert to TCHAR* argv[]

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  • Delegates in Action -Help

    - by Amutha
    I am learning delegates.I am very curious to apply delegates to the following chain-of-responsibility pattern. Kindly help me the way to apply delegates to the following piece. Thanks in advance.Thanks for your effort. #region Chain of Responsibility Pattern namespace Chain { public class Player { public string Name { get; set; } public int Score { get; set; } } public abstract class PlayerHandler { protected PlayerHandler _Successor = null; public abstract void HandlePlayer(Player _player); public void SetupHandler(PlayerHandler _handler) { _Successor = _handler; } } public class Employee : PlayerHandler { public override void HandlePlayer(Player _player) { if (_player.Score <= 100) { MessageBox.Show(string.Format("{0} is greeted by Employee", _player.Name)); } else { _Successor.HandlePlayer(_player); } } } public class Supervisor : PlayerHandler { public override void HandlePlayer(Player _player) { if (_player.Score >100 && _player.Score<=200) { MessageBox.Show(string.Format("{0} is greeted by Supervisor", _player.Name)); } else { _Successor.HandlePlayer(_player); } } } public class Manager : PlayerHandler { public override void HandlePlayer(Player _player) { if (_player.Score > 200) { MessageBox.Show(string.Format("{0} is greeted by Manager", _player.Name)); } else { MessageBox.Show(string.Format("{0} got low score", _player.Name)); } } } } #endregion #region Main() void Main() { Chain.Player p1 = new Chain.Player(); p1.Name = "Jon"; p1.Score = 100; Chain.Player p2 = new Chain.Player(); p2.Name = "William"; p2.Score = 170; Chain.Player p3 = new Chain.Player(); p3.Name = "Robert"; p3.Score = 300; Chain.Employee emp = new Chain.Employee(); Chain.Manager mgr = new Chain.Manager(); Chain.Supervisor sup = new Chain.Supervisor(); emp.SetupHandler(sup); sup.SetupHandler(mgr); emp.HandlePlayer(p1); emp.HandlePlayer(p2); emp.HandlePlayer(p3); } #endregion

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  • How to Debug Java Application using VIM/GVIM?

    - by Techmaddy
    I asked this question previously: http://stackoverflow.com/questions/495268/any-good-tutorial-for-moving-from-eclipse-to-vim From the inputs, I started using GVIM instead of Eclipse. I added ctags to it and I am able to navigate now comfortably. Only problem left for me is "Debugging"? I tried searching for some links, and couldn't a useful one? If anyone using or familiar with Java Debugging using vim/Gvim, can provide there inputs/ links/ tutorials, it would be very helpful. Thanks in advance.

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  • [CSS] TreeView Selected (active) Node

    - by nCdy
    got a TreeView with some nodes. css for node : a:link { color:#333333; text-decoration:none; } css for visited node : a:visited { color:#333333; text-decoration:none; } for selected active mode : a:active { color:#222222; } but it doesn't appears to active element :( why that could happens ?

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  • Jerky Silverlight 4 animations when running app in OOB

    - by sha1dy
    I was playing with new Silverlight 4 and to my surprise when I run my sample application in OOB all animations become very jerky when I move mouse around during animations, but when I run my app in browser animations are smooth even when moving mouse around. I tried my app on two different computers, turned on GPU acceleration in OOB settings - and got the same jerky result. Is this a know problem with Silverlight?

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