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  • C# - Common way to format listview controls on forms?

    - by John M
    In a C# Winform application (3.5) there are numerous forms each with different listview controls. While each listview control uses different datasets the basic formatting of each remains the same. Basic formatting takes this form: /* appearance */ this.lstA.View = View.Details; this.lstA.AllowColumnReorder = true; this.lstA.CheckBoxes = false; this.lstA.FullRowSelect = true; this.lstA.GridLines = false; this.lstA.Sorting = SortOrder.Ascending; What I would like to do is create a class that can be used to set the initial format of the listview. How do I pass the listview (by reference?) to the class so that the appearance properties can be set?

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  • T-SQL Question : Query to XML

    - by Juvil John Soriano
    anyone can show me how to generate from this data ------------------------DATA-------------------------- Key ParentKey 5 NULL 25 5 33 25 26 5 27 5 34 27 28 5 29 5 to this XML result? ---------------------RESULTS-------------------------- <record key="5" parentkey = ""> <record key="25" parentkey = "5"> <record key="33" parentkey = "25"></record> </record> </record> <record key="25" parentkey = "5"> <record key="26" parentkey = "5"> <record key="27" parentkey = "5"> <record key="34" parentkey = "27"></record> </record> </record> <record key="28" parentkey = "5"> <record key="29" parentkey = "5"> </record>

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  • Wrapping a Flash/AS3 Sprite as a Flex MXML component

    - by John
    For my game, I am making the main game view as a plain Flash/AS3 class, something like: public class GameArena extends Sprite This is simply a big rectangle in which game objects are drawn, so no need for fancy UI and I want to keep the main game engine Flex-free so I can use Sprites rather than heavier Flex components. However for the entire game/app, I do still want to use Flex for GUI/layout. So I thought I could create a Flex class subclassing UIComponent, which has a GameView object as a child... now I can use this in MXML as a standard Flex component. e.g. public class ArenaView extends UIComponent { public var gameArena:GameArena; override protected function createChildren():void { super.createChildren(); if (!gameArena) { gameArena = new GameArena(); gameArena.width = 200; gameArena.height = 200; addChild(gameArena); } } } Then I have a simple line in my main App MXML like: <logic:Arena x="0" y="0" width="50%" height="100%" name="TestArenaPanel" /> But so far while my code compiles, the Flash class isn't getting rendered. Maybe it's something simple, but I wanted to ask if this is a reasonable approach, or there is something better? BTW: I've had the "should Flex be used" conversation many times. If you want to discuss that please do so in comments, but keep answers on topic.

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  • Are all of the Oracle exceptions named?

    - by John O
    In particular, I've been trying to find the name of the ORA-0955 to improve code readability. Currently I'm using the following: EXCEPTION WHEN OTHERS THEN IF SQLCODE = -00955 What I would prefer is something like: EXCEPTION WHEN OBJECT_EXISTS THEN This seems cleaner to me and I would prefer that. But I've looked in SYS.STANDARD, and it lists relatively few named exceptions. Online documentation seems to mirror what's in SYS.STANDARD. Is there another package to look in? Some other resource?

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  • Limiting object allocation over multiple threads

    - by John
    I have an application which retrieves and caches the results of a clients query. The client then requests different chunks of data and the application sends the relevant results and removes them from the cache. A new requirement for this application is that there needs to be a run-time configurable maximum number of results which may be cached. I've taken the naive approach and implemented this by using a counter under a lock which is incremented every time a result is cached and decremented whenever a result is removed from the cache. Unfortunately, this has drastically reduced the applications performance when processing a large number of concurrent requests. I have tried both a critical section lock and spin-lock; the performance improves a bit with a spin-lock, but is still unacceptably slow. Is there a better way to solve this problem which may improve performance? Right now I have a thread pool that services requests and each request is tied to a Request object which stores that cached results for that particular request. Here is a simplified pseudo code version of my current implementation: void ResultCallback( Result result, Request *request ) { lock totalResultsCached lock cachedLimit if( totalResultsCached + 1 > cachedLimit ) { unlock cachedLimit unlock totalResultsCached //cancel the request return; } ++totalResultsCached; unlock cachedLimit unlock totalResultsCached request.add(result) } void SendResults( int resultsToSend, Request *request ) { while ( resultsToSend > 0 ) { send(request.remove()) lock totalResultsCached --totalResultsCached unlock totalResultsCached --resultsToSend; } }

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  • 2 dimensional arrays passed to a function in c++

    - by John Marcus
    I'm working on doing calculations in a two dimensional array but keep getting a nasty error. i call the function by : if(checkArray(array)) and try to pass it in like this: bool checkArray(double array[][10]) //or double *array[][10] to no avail the error is error: cannot convert ‘double ()[(((unsigned int)(((int)n) + -0x00000000000000001)) + 1)]’ to ‘double’ for argument ‘1’ to ‘bool checkArray(double*)’ code snippet //array declaration int n = 10; double array[n][n]; //function call to pass in array while(f != 25) { cout<<endl; cout<<endl; if(checkArray(array)) //this is the line of the error { cout<<"EXIT EXIT EXIT"<<endl; } f++; } //function declaration bool checkArray(double *array)//, double newArray[][10]) { double length = sizeof(array); for(int i = 0; i < length; i++) for(int j = 0; j < length;j++) { double temp = array[i][j]; } }

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  • Automatically update php loop with data pulled from database

    - by John Svensson
    SQL STRUCTURE CREATE TABLE IF NOT EXISTS `map` ( `id` int(11) NOT NULL AUTO_INCREMENT, `x` int(11) NOT NULL, `y` int(11) NOT NULL, `type` varchar(50) NOT NULL, PRIMARY KEY (`id`) ) ENGINE=InnoDB DEFAULT CHARSET=latin1 AUTO_INCREMENT=3 ; http://localhost/map.php?x=0&y=0 When I update the x and y via POST or GET, I would like to pull the new data from the database without refreshing the site, how would I manage that? Could someone give me some examples, because I am really stuck here. <?php mysql_connect('localhost', 'root', ''); mysql_select_db('hol'); $startX = $_GET['x']; $startY = $_GET['y']; $fieldHeight = 6; $fieldWidth = 6; $sql = "SELECT id, x, y, type FROM map WHERE x BETWEEN ".$startX." AND ".($startX+$fieldWidth). " AND y BETWEEN ".$startY." AND ".($startY+$fieldHeight); $result = mysql_query($sql); $positions = array(); while ($row = mysql_fetch_assoc($result)) { $positions[$row['x']][$row['y']] = $row; } echo "<table>"; for($y=$startY; $y<$startY+$fieldHeight; $y++) { echo "<tr>"; for($x=$startX; $x<$startX+$fieldWidth; $x++) { echo "<td>"; if(isset($positions[$x][$y])) { echo $positions[$x][$y]['type']; } else { echo "(".$x.",".$y.")"; } echo "</td>"; } echo "</tr>"; } echo "</table>"; ?>

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  • jQuery selector to target any CSS name (of multiple present) starting with a prefix?

    - by John K
    I'm considering one selection statement that would target one of many css class names in a single class attribute value based on a string prefix. For example, I want any detail- prefixed class names to get targeted from the following sample links. <a href="eg.html" class="detail-1 pinkify another"> <a href="eg.html" class="something detail-55 minded"> <a href="eg.html" class="swing narrow detail-Z"> <a href="eg.html" class="swing narrow detail-Z detail-88 detail-A"> It's reminiscent of how [class|="detail"] prefix selector works on a scalar attribute value, and also of .hasClass(className), but my question needs both concepts applied simultaneously. Note: The detail- prefix won't necessarily be the first class name of the bunch.

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  • [MS-DOS] Read command-line parameters to .bat from file

    - by John
    I have a build.bat file which uses %1 internally... so you might call: build 1.23 I wanted it to read the parameter from a separate file, so I tried putting "1.23" in version.txt and doing: build < version.txt But it doesn't work. Isn't this how piping works? Is what I want possible and if so how?

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  • [Win32/MFC] Making group-boxes contain things

    - by John
    As I understand it, a group-box is just another control. Controls inside it are not owned by it, so unlike in Winforms, if you move a group-box the contained controls stay put. What would be the nicest way to address this? Just create your own data-structure mapping controls to 'container' group-boxes so that when the container is moved the children are automatically moved?

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  • Ruby hash value truthiness and symbols

    - by John Topley
    Could somebody please explain why the variable named foo remains true in the code below, even though it's set to false when the method is called? And why the symbol version behaves as expected? def test(options = {}) foo = options[:foo] || true bar = options[:bar] || :true puts "foo is #{foo}, bar is #{bar}" end >> test(:foo => false, :bar => :false) foo is true, bar is false I've only tried this using Ruby 1.8.7.

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  • Static variables within functions in C++ - allocated even if function doesn't run?

    - by John C
    I've been reading up on C++ on the Internet, and here's one thing that I haven't been quite able to find an answer to. I know that static variables used within functions are akin to globals, and that subsequent invocations of that function will have the static variable retain its value between calls. However, if the function is never claled, does the static variable get allocated? Thanks

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  • Javascript append to onClick event

    - by John Hartsock
    Guys I have the following Code which I know doesnt work correctly. Yes I know how to do this in JQuery but In this case I cannot use jquery. Please no jquery answers. <form> <input type="text" name="input1" onclick="alert('hello')"> <input type="text" name="input2"> <input type="text" name="input3"> </form> <script type="text\javascript"> window.onload = function () { var currentOnClick; for (var i = 0; i < document.forms[0].elements.length; i++) { currentOnClick = document.forms[0].elements[i].onclick; document.forms[0].elements[i].onclick = function () { if (currentOnClick) { currentOnClick(); } alert("hello2"); } } } </script> What Im trying to do is iterate through the form's elements and add to the onclick function. But due to the fact that in my last iteration currentOnClick is null this does not run as expected. I want to preserve each of the elements onclick methods and play them back in the new fuction Im creating. What I want: When input1 is clicked, alert "hello" then alert "hello2" When Input2 is clicked, alert "hello2" When Input3 is clicked, alert "hello2"

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  • Creative Technical Interview Questions for Developers

    - by John Shedletsky
    I do a good number of in-person technical interviews for new developers. I like to ask technical questions where I ask people to either code something up or develop an algorithm to solve a task. I feel my current repertoire is uninspired. In my opinion, the ideal interview question has these qualities: Multiple solutions, where some are obviously better than others, and some that involve subtle trade-offs (discussing tradeoffs is a good way to gauge someone's experience, in my opinion). Novelty - asking the "insert this element into a linked list" question is only good for weeding out people who never did their homework. Elegant - I like questions where the core problem isn't hidden in a lot of details. Everyone should be able to understand the problem, even if everyone can't solve it on the whiteboard. Elegant questions are difficult without involving undue amounts of "domain knowledge" or getting too narrow. Have you been on either side of an interview where someone (maybe you!) asked a particularly good programming or algorithms question?

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  • Programming in a noisy office [closed]

    - by John Isaacks
    Can anyone recommend any techniques or advice for working in a noisy office? I know some people wear headphones and listen to music but I prefer silence. I work in a room with 4 others, there are no walls between us, we just each have our own desk. There is usually always someone talking, or on the phone, or on the intercom. Has anyone else had to deal with this? What did you do? What would you recommend?

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  • Accessing weakly typed facebook sdk result object properties in .NET 3.5 using the API?

    - by John K
    Consider the following in .NET 3.5 (using the Bin\Net35\Facebook*.dll assemblies): var app = new FacebookApp(); var result = app.Get("me"); // want to access result properties with no dynamic ... in the absence of the C# 4.0 dynamic keyword this provides only a generic object. How best should I access the properties of this result value? Are there helper or utility methods or stronger types in the facebook C# sdk, or should I use standard .NET reflection techniques?

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  • Generate a valid array key from an URL string in PHP

    - by John Riche
    I have a PHP array with some predefined values: $aArray = array( 0 => 'value0', 1 => 'value1' ); I need to create a function where the string input will always return the same, valid, array key so that when I call: GiveMeAKey('http://www.google.com'); // May return 0 or 1 I receive always the same key (I don't care which one) from the array. Obvisously I can't store the relationship in a database and the string passed to the GiveMeAKey method can be any URL. I wonder if there is a way of doing that ?

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  • font-smoothing not applied to buttons

    - by David
    I have used this snippet to prevent webkit from changing antialiasing when using CSS transforms: html{ -webkit-font-smoothing: antialiased; } This works fine for most cases, however I noticed some weirdness in chrome when playing around with Bootstrap using this HTML: <button class="btn btn-inverse">John Doe</button> <a class="btn btn-inverse">John Doe</a>? This is how it looks in OSX/Chrome: Fiddle: http://jsfiddle.net/hY2J7/. In fact, it seems that it is not applied to buttons at all. Is there a safer technique to trigger the same antialiasing in webkit for all elements?

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