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  • Hidden Features of PHP?

    - by George Mauer
    EDIT: This didn't really start as a hidden features of PHP topic, but thats what it ended up as, so go nuts. I know this sounds like a point-whoring question but let me explain where I'm coming from. Out of college I got a job at a PHP shop. I worked there for a year and a half and thought that I had learned all there was to learn about programming. Then I got a job as a one-man internal development shop at a sizable corporation where all the work was in C#. In my commitment to the position I started reading a ton of blogs and books and quickly realized how wrong I was to think I knew everything. I learned about unit testing, dependency injection and decorator patterns, the design principle of loose coupling, the composition over inheritance debate, and so on and on and on - I am still very much absorbing it all. Needless to say my programming style has changed entirely in the last year. Now I find myself picking up a php project doing some coding for a friend's start-up and I feel completely constrained as opposed to programming in C#. It really bothers me that all variables at a class scope have to be referred to by appending '$this-' . It annoys me that none of the IDEs that I've tried have very good intellisense and that my SimpleTest unit tests methods have to start with the word 'test'. It drives me crazy that dynamic typing keeps me from specifying implicitly which parameter type a method expects, and that you have to write a switch statement to do method overloads. I can't stand that you can't have nested namespaces and have to use the :: operator to call the base class's constructor. Now I have no intention of starting a PHP vs C# debate, rather what I mean to say is that I'm sure there are some PHP features that I either don't know about or know about yet fail to use properly. I am set in my C# universe and having trouble seeing outside the glass bowl. So I'm asking, what are your favorite features of PHP? What are things you can do in it that you can't or are more difficult in the .Net languages?

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  • What is the best IDE?

    - by venom
    Hello. As a not so experienced man in programming, I start to use netbeans PLATFORM. And I am really impressed by its power (for rich desktop app). I have been learning the programming in another way on university. I have never thought that something as powerful as nb Platform exists. My idea was that 30 people work on some rich desktop app for more than year to make it "beta". Now I know, that it is much more easier. But, I have never be satisfied with my own opinions about "something is best". I am still looking for better mouse trap. So the question is: What is most powerful IDE you know? (it does not strongly depends on language, it means if some combination of language/IDE is really powerful, feel free to answer.)

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  • EE Major : Should I learn Ruby on Rails or Haskell?

    - by Vivek
    Hi,I've just completed my freshman year in college and am majoring in EE (with a lot of interest in CS as well) . I know some Python,C/C++ and Java and also a little bit of Actionscript . I am planning to learn either Haskell or Ruby on Rails. Haskell because it is a functional programming language, and I've been really impressed by this paradigm and Ruby on Rails , as I don't know any 'web' programming language and have heard that you can develop apps in RoR very easily and quickly . Which one should I learn ? and please suggest some links / books for starting off .

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  • Java and C#, how close are they?

    - by prosseek
    I've been using C/C++ and Python pretty seriously, but I now I see that a lot of new programming books use Java or C# as examples. I don't think I'll use Java or C# for the time being, but I guess I have to study one of the languages (or both of them) in order to read and understand the books. How similar Java and C#? If I learn Java, is learning C# almost free? Or vice versa? If I have to choose only one of the two languages, which would be better? Which has wider coverage in terms of programming language?

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  • creating a tooltip for a line drawn on cartesiandatacanvas in flex

    - by Guru
    I am trying to draw a line on cartesiandatacanvas. While I am able to draw lines easily using the canvas.moveTo and canvas.lineTo methods, I cannot provide a tooltip to the line if I use that functionality. I have tried creating a label(when ever I draw a line) and adding a tooltip to it but since I show the lines in a 10*10 grid both vertical and horizontal there is a overlap and it is confusing. So now I am trying to create a line object that extends shape or UIComponent. I cannot add this object to canvas using the addChild method it does not work. The addDataChild method works but it messes with the positioning of the line. Can someone help with a solution to this. Simply put I want to draw lines on a datacanvas and add tooltips to them. Here is my code for the line object: package model { import flash.display.CapsStyle; import flash.display.JointStyle; import flash.display.LineScaleMode; import mx.core.UIComponent; public class Line extends UIComponent { public var x1:Number; public var x2:Number; public var y1:Number; public var y2:Number; public var color:Number; public function Line(x1:Number, y1:Number, x2:Number, y2:Number,color:Number) { super(); this.graphics.lineStyle(4, color, 1, true, LineScaleMode.NORMAL, CapsStyle.ROUND, JointStyle.MITER, 1 ); this.graphics.moveTo(x1,y1); this.graphics.lineTo(x2,y2); } } } Here is a sample MXML that has a canvas and tries to use the line object above: <?xml version="1.0" encoding="utf-8"?> <mx:WindowedApplication xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute" initialize="init()"> <mx:Script> <![CDATA[ import model.Line; import mx.charts.chartClasses.CartesianCanvasValue; private var accidImage:Image = new Image(); public function init():void { var line:Line = new Line(10,10,40,40,0XFF0000); // canvas.addChild(line); *Does not Work* canvas.addDataChild(line,10,10,null,null,null,null); } ]]> </mx:Script> <mx:Panel x="60" y="53" width="517" height="472" layout="absolute"> <mx:PlotChart x="48" y="10" id="plotchart1"> <mx:series> <mx:PlotSeries displayName="Series 1" yField=""/> </mx:series> <mx:annotationElements> <mx:CartesianDataCanvas id="canvas" includeInRanges="true"/> </mx:annotationElements> <mx:verticalAxis> <mx:LinearAxis id="axis11" minimum="0" maximum="100" interval="10" padding="10"/> </mx:verticalAxis> <mx:horizontalAxis> <mx:LinearAxis id="axis21" minimum="0" maximum="100" interval="10" padding="10"/> </mx:horizontalAxis> </mx:PlotChart> <mx:Legend dataProvider="{plotchart1}"/> </mx:Panel> </mx:WindowedApplication>

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  • Are there such things as summer jobs for teenage programmers?

    - by Gbps
    I've taken programming as a hobby, studying it since I was 10 or so. 7 years to date, I've become progressivly good at C++, PHP, C#, Assembly, Lua, and the web languages such as HTML and CSS. Though I've never taken a class, I've been able to complete most, if not all of the questions from different "Programmer Interview Questions" articles and have participated in some small scale projects in the past. Summer starting yesterday for me, I've been thinking about how to keep busy while maybe earning some money along the way. Now, some kids mow lawns, others get fast food jobs, but what about programming jobs? Is there even such a thing?

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  • Call a function by its name, given from string java

    - by Joao
    Hello, I would like to be able to call a function based on its name provided by a string. Something like public void callByName(String funcName){ this.(funcName)(); } I have searched a bit into lambda funcions but they are not supported. I was thinking about going for Reflection, but I am a bit new to programming, so I am not so familiar with the subject. This whole question was brought up on my java OOP class, when I started GUI (Swing, swt) programming, and events. I found that using object.addActionCommand() is very ugly, because I would later need to make a Switch and catch the exact command I wanted. I would rather do something like object.attachFunction(btn1_click), so that it would call the btn1_click function when the event click was raised. Thank you Joao

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  • Seemingly simple skinning problem in Flex4; style gives disco effect

    - by Cheradenine
    I'm doing something wrong, but I can't figure out what. Simple project in flex4, whereby I create a skinned combobox (fragments at end). If I turn on the 3 skin references (over-skin, up-skin, down-skin), the combobox appears to simply stop working. If I remove the up-skin, hovering over the combo produces a flickering effect, where it appears to apply the style, then remove it immediately. I get the same thing with a button instead of a combo. I'm sure it's something really simple, but it's evading me. <?xml version="1.0" encoding="utf-8"?> <s:Application xmlns:fx="http://ns.adobe.com/mxml/2009" xmlns:s="library://ns.adobe.com/flex/spark" xmlns:mx="library://ns.adobe.com/flex/mx" minWidth="955" minHeight="600" xmlns:containers="flexlib.containers.*"> <fx:Declarations> <!-- Place non-visual elements (e.g., services, value objects) here --> </fx:Declarations> <fx:Style> @namespace s "library://ns.adobe.com/flex/spark"; @namespace mx "library://ns.adobe.com/flex/mx"; #myCombo { over-skin: ClassReference("nmx.MyComboSkin"); up-skin: ClassReference("nmx.MyComboSkin"); down-skin: ClassReference("nmx.MyComboSkin"); } </fx:Style> <fx:Script> <![CDATA[ [Bindable] public var items:Array = ["A","B","C"]; ]]> </fx:Script> <mx:Canvas backgroundColor="#ff0000" width="726" height="165" x="20" y="41"> <mx:ComboBox id="myCombo" x="10" y="10" prompt="Hospital" dataProvider="{items}"> </mx:ComboBox> </mx:Canvas> </s:Application> Skin Definition: package nmx { import flash.display.GradientType; import flash.display.Graphics; import mx.skins.Border; import mx.skins.ProgrammaticSkin; import mx.skins.halo.ComboBoxArrowSkin; import mx.skins.halo.HaloColors; import mx.utils.ColorUtil; public class MyComboSkin extends ProgrammaticSkin { public function MyComboSkin() { super(); } override protected function updateDisplayList(w:Number, h:Number):void { trace(name); super.updateDisplayList(w, h); var arrowColor:int = 0xffffff; var g:Graphics = graphics; g.clear(); // Draw the border and fill. switch (name) { case "upSkin": case "editableUpSkin": { g.moveTo(0,0); g.lineStyle(1,arrowColor); g.lineTo(w-1,0); g.lineTo(w-1,h-1); g.lineTo(0,h-1); g.lineTo(0,0); } break; case "overSkin": case "editableOverSkin": case "downSkin": case "editableDownSkin": { // border /*drawRoundRect( 0, 0, w, h, cr, [ themeColor, themeColor ], 1); */ g.moveTo(0,0); g.lineStyle(1,arrowColor); g.lineTo(w-1,0); g.lineTo(w-1,h-1); g.lineTo(0,h-1); g.lineTo(0,0); // Draw the triangle. g.beginFill(arrowColor); g.moveTo(w - 11.5, h / 2 + 3); g.lineTo(w - 15, h / 2 - 2); g.lineTo(w - 8, h / 2 - 2); g.lineTo(w - 11.5, h / 2 + 3); g.endFill(); } break; case "disabledSkin": case "editableDisabledSkin": { break; } } } } }

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  • grails metaprogramming

    - by Don
    Hi, My understanding is that there are two obvious places in a Grails app where one can do meta-programming: The init closure of Bootstrap.groovy The doWithDynamicMethods closure of a plugin The meta-programming I'm referring to here should be visible throughout the metaprogramming, typical examples include adding (or replacing) methods of 3rd party classes. String.metaClass.myCustomMethod = { /* implementation omitted */ } The disadvantage of (1), is that the metaprogramming won't be applied when the application is dynamically reloaded. The disadvantage of (2) is that I need to create and maintain an entire plugin just for the sake of a little metaprogramming. Is there a better place to do this kind of metaprogramming? Thanks, Don

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  • C# Training Quizzes

    - by John Sheppard
    Hello there, I have been programming 10 years, mostly in vba and vb.net but I know c# well enough to program what I normally do. I yesterday was applying for a Senior c# position and I did so poorly on the induction test its not funny :) I have always found that for me the best way to learn and recall is via question's and answers (multichoice and short answer). That is, a question is posed and after I answer instant feedback is given as to whether I choose right or wrong and the reasons why. As such I was wondering if anyone knew of or could recommend a C# quiz website. Something like a daily c# quiz to keep my brain up to date and fresh if I'm not always programming in it. Not something wimpy either. Something that does everything. Paying is not an obstacle, id prefer to pay for a good resource than muck around. Thank you

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  • Why exactly is eval evil?

    - by Jay
    I know that Lisp and Scheme programmers usually say that eval should be avoided unless strictly necessary. I´ve seen the same recommendation for several programming languages, but I´ve not yet seen a list of clear arguments against the use of eval. Where can I find an account of the potential problems of using eval? For example, I know the problems of GOTO in procedural programming (makes programs unreadable and hard to maintain, makes security problems hard to find, etc), but I´ve never seen the arguments against eval. Interestingly, the same arguments against GOTO should be valid against continuations, but I see that Shemers, for example, won´t say that continuations are "evil" -- you should just be careful when using them. They´re much more likely to frown upon code using eval than upon code using continuations (as far as I can see -- I could be wrong).

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  • What is the best API/framework/platform you ever worked with?

    - by Yuval A
    Most programming is done on an existing framework or platform, and using various APIs which make your programming job much more convenient. It can either be a superbly designed set of APIs, or a nice framework which you managed to get really cool things done really fast. All answers should give concrete examples of why that framework is so awesome, or examples of cool stuff you did with it. What existing framework really inspired you to do some awesome work? I know this is subjective, but I think we can get some cool ideas from this question. Please be easy on the "close" link :) Also - commun-ikified in advance.

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  • How to access a SIM card programatically?

    - by mawg
    Just any old GSM compatible SIM card (bonus for 3G USIM). I presume I need some hardware? Can anyone recommend something cheap for hobbyist, and something more professional? I presume that there will be full docs of an API with the h/w, so maybe this should be tagged "no-programming-related"? Sorry, if so. Any good URLs or books (I am conversant with the 3GPP standards). I'm not (black hat) hacking, don't worry, just not pleased with the likes of SIM Card Secretary, Data Doctor Recovery, etc, so would like to code my own, but might turn it commercial, or offer SIM card programming services (data recover from damaged card, etc) as a sideline.

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  • What (kind of) project could I create to learn JavaScript?

    - by Aziz Light
    Hello, I started learning JavaScript a while ago. It's a fairly easy programming language considering that I learned Java in university, that I know php pretty well and that I already played around with python and ruby. The problem is that to properly learn a programming language I usually create a project. In javascript, I just don't know what kind of project I could create - that is, a project that is not web-based or related to the web browser. Can I create javascript shell scripts? Where is javascript commonly used beside the web browsers? So, can someone actually give me some ideas please?

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  • How beneficial is this subject combination for an undergrad CS student?

    - by Maxood
    I'm an undergrad Computer Science student and studying online. There is a lot of self study, independent research and practice i have to do myself. I wonder how beneficial would it be to choose this subject combination in programming: Data Structures OOP Assembly Language & Computer Architecture Although i also have the option to take DLD (Digital Logic Design) or Data communication courses instead of Assembly Language. My interest lies in programming and i'm also working as a programmer at local software house. Can anyone give me some good advice and suggestions.

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  • What should every programmer know?

    - by Matt Lacey
    Regardless of programming language(s) or operating system(s) used or the environment they develop for, what should every programmer know? Some background: I'm interested in becoming the best programmer I can. As part of this process I'm trying to understand what I don't know and would benefit me a lot if I did. While there are loads of lists around along the lines of "n things every [insert programming language] developer should know", I have yet to find anything similar which isn't limited to a specific language. I also expect this information to be of interest and benefit to others.

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  • QGraphicsView and custom Cursors

    - by Etienne de Martel
    I am trying to make use of a mix of custom cursors and preset cursors for my QGraphicsView. In my implementation we have created a notion of "modes" for the view. Meaning that depending on what "mode" the user is in, different things will happen on the left-click, or left-click drag. Anyway, none of that is the problem, just the context. The problem arises when I try to change the cursor for each mode. For instance, for mode 1 we want to show the regular Arrow cursor, but for mode 2, we want to use a custom pixmap. Seemingly simple we call graphicsview->viewport()->setCursor(Qt::QArrowCursor)  when we are switching to mode 1, and graphicsview->viewport()->setCursor(our custom cursor) for mode 2. Except it doesn't work at all. Firstly, the cursor does not change to the custom cursor. That is the first problem. However, if through another operation the drag mode of the graphics view gets set to ScrollHandDrag, the cursor will switch to the custom cursor once the drag operation is complete. Weird. But the plot thickens... Once we switch to the custom cursor, it can never be changed back to the ArrorCursor no matter how many times we call setCursor(Qt::QArrowCursor). it also doesn't seem to matter whether I call setCursor on the viewport or the graphics view itself. So, just for fun, I added a call to graphicsview->unsetCursor() just before we want to change the cursor, and that at least rectifies the second problem. The cursor changes just fine so long as we do a little HandDragging in between. Better, but certainly not optimal. However it should be noted, that doing the unsetCursor on the viewport doesn't work. it must absolutely be done on the graphicsview - regardless of the fact that we are setting the cursor on the viewport. To completely patch over the problem I have added these two lines after I set the cursor: graphicsview->setDragMode(QGraphicsView::ScrollHandDrag); graphicsview->setDragMode(QGraphicsView::NoDrag); Which works, but ye gads!! So something magical is happening inside these two methods that fixes the problem, but glancing at the code I don't see what. Something to do with the fact that the drag mode is changing the cursor I imagine. Just for completeness, I should also mention that the thing that triggers the mode change, is a QPushButton that has been added to the scene using QGraphicsScene->addWidget(). I don't know if that has anything to do with it, but you never know. I am hoping that either someone could clarify why I need to make these seemingly random calls. I don't think I am doing anything wrong anywhere. Thanks in advance for any help. EDIT: Here is an actual code example with the cursor patches as described above. You can look at and/or download them from the link below. It was a little long to paste here. I included the framework around which the cursors are changed, because I have a funny feeling that that is important somehow. https://gist.github.com/712654 The code where the problem lies is in MyGraphicsView.cpp starting at line 104. This is where the cursor is set in the graphics view. It is exactly as described above. Keep in mind, with the very ugly patches in place the cursors do work - more or less. Without those lines you will see very clearly the problems listed in the post above. Also included in the link, is all the code for a mainWindow that uses the view, etc... the only thing missing are the images I am using. But the images themselves don't matter, any 16x16 pngs will do.

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  • Does Objective-C have a Standard Library?

    - by Roman A. Taycher
    Most somewhat modern programming languages have a standard library? It is my impression is that there isn't a decent sized standard library for Obj-C , rather that it relies mostly/all on Cocoa and that (plus people not wanting to use GNUstep) is why Obj-C is only used on macs)? Is this true/to what extent? Are there any standard obj-c collections? (note I haven't done any Obj-C programming and am not to likely to try it in the near future, I'm just curious). P.S. are there a any decent non-Cocoa/Gnustep Libraries? are they non-apple, are they open source, well documented?

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  • What is the current state of Unit testing support in the R language

    - by PaulHurleyuk
    R is a statistics programming language. Part of R is the use of Packages, which themselves are written in the R language. Programming best practice includes the use of unit-testing to test the functions within these packages while they are being written and when they are used. I am aware of a few packages for unit testing within R, these being RUnit Svunit Testthat I'm interested to know; Are there any other packages out there ? Given peoples experience, do these packages excel at different things ? What's the current state of the art in unit testing for R ?

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  • Finding the time to program in your spare time?

    - by Omar Kooheji
    I've got about a dozen programming projects bouncing about my head, and I'd love to contribute to some open source projects, the problem I have is that having spent the entire day staring at Visual Studio and or Eclipse (Sometimes both at the same time...) the last thing I feel like doing when I go home is program. How do you build up the motivation/time to work on your own projects after work? I'm not saying that I don't enjoy programming, it's just that I enjoy other things to and it can be hard to even do something you enjoy if you've spent all day already doing it. I think that if I worked at a chocolate factory the last thing I'd want to see when I got home was a Wonka bar.... Related: How do you keep a balance between working, training, health and family?

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  • Malloc to a CGPoint Pointer throwing EXC_BAD_ACCESS when accessing

    - by kdbdallas
    I am trying to use a snippet of code from a Apple programming guide, and I am getting a EXC_BAD_ACCESS when trying to pass a pointer to a function, right after doing a malloc. (For Reference: iPhone Application Programming Guide: Event Handling - Listing 3-6) The code in question is really simple: CFMutableDictionaryRef touchBeginPoints; UITouch *touch; .... CGPoint *point = (CGPoint *)CFDictionaryGetValue(touchBeginPoints, touch); if (point == NULL) { point = (CGPoint *)malloc(sizeof(CGPoint)); CFDictionarySetValue(touchBeginPoints, touch, point); } Now when the program goes into the if statement it assigns the 'output' of malloc into the point variable/pointer. Then when it tries to pass point into the CFDictionarySetValue function it crashes the application with: Program received signal: “EXC_BAD_ACCESS”. Someone suggested not doing the malloc and pass the point var/pointer as: &point, however that still gave me a EXC_BAD_ACCESS. What I am (and it looks like Apple) doing wrong??? Thanks in advance.

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