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• What's the deal with char.GetNumericValue?

  - by mgroves

  I was working on Project Euler 40, and was a bit bothered that there was no int.Parse(char). Not a big deal, but I did some asking around and someone suggested char.GetNumericValue. GetNumericValue seems like a very odd method to me: Takes in a char as a parameter and returns...a double? Returns -1.0 if the char is not '0' through '9' So what's the reasoning behind this method, and what purpose does returning a double serve? I even fired up Reflector and looked at InternalGetNumericValue, but it's just like watching Lost: every answer just leads to another question.

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• How do I change the window that appears when I insert my pen drive?

  - by NeoHaxxor

  Basically all that has to be said has been said in the title. How do I make a window other than the default one pop up when I insert my pen drive into my PC? Can it come from a program in the USB itself as well? Not doing any actual coding yet. Btw- if that default window with al the options has a special name plz tell me. Just so I can word my Google searches better. Any help would be appreciated. Thx

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• Importing Liferay portlet into Eclipse IDE

  - by jyo

  Hi I haved created a portlet through plugins SDK and wanted to import that into the eclipse ,but it did not imported as it is , But after creating the portlet if i give " ant setup-eclipse " then the project get imported into the eclipse .i have searched for this almost 2 days then i found the solution .. How do i know what all the commands i have in ant . like in the API i will have all the methods where i can see there and get on with my coding work ,how with ant ? how do i know wat all the commands i need to implement ? Thanks

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• After C++ - Python or Java?

  - by carleeto

  I'm fast approaching the point in my coding where I would like to quickly write object oriented code in languages other than C++ for a variety of reasons. After a lot of research, my choices have pretty much narrowed down to Python and Java. I'm leaning towards Python because of its relationship to C, but with Java, from what I can see, I get a good introduction to using and creating test suites with Eclipse - there is also Processing which is pulling me towards Java. I'm not the kind of guy to tackle two languages at once, so which one would you recommend and why? What I want at the end is to have an additional language I can use for rapid development. Ease of learning isn't important to me as I'm willing to put in the time regardless. Ability to use the new language widely is.

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• Web Application - Authentication / Login Framework

  - by user456563

  This is a very simple, probably a most asked question and frequently developed as part of any web application. Say I'm planning to build a web application and some of the functional requirements include (apart from the usual hard hitting security reqs), - Need to have users sign up for a new account profile - Authenticate user using the native app authentication / Facebook or Google or Yahoo or OpenId login - Allow lost password retrieval - Session handling needs Is there an out of the box frameworks (Drupal, Liferay??) that I can use to wrap my application which can be a bunch of JSP's or HTML's with JS? I know I'm asking a very simple and maybe a naive question. But this is a topic every web developer guru will go thru. Any help, advise and pointers much appreciated.

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• 'Advanced' Console Application

  - by keynesiancross

  Hi all, I'm not sure if this question has been answered elsewhere and I can't seem to find anything through google that isn't a "Hello World" example... I'm coding in C# .NET 4.0. I'm trying to develop a console application that will open, display text, and then wait for the user to input commands, where the commands will run particular business logic. For example: If the user opens the application and types "help", I want to display a number of statements etc etc. I'm not sure how to code the 'event handler' for user input though. Hopefully this makes sense. Any help would be much appreciated! Cheers.

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• Is it legal for a C++ reference to be NULL?

  - by BCS

  A while back I ran into a bug the looked something like this: void fn(int &i) { printf(&i == NULL ? "NULL\n" : "!NULL\n"); } int main() { int i; int *ip = NULL; fn(i); // prints !NULL fn(*ip); // prints NULL return 0; } More recently, I ran into this comment about C++ references: [References arguments make] it clear, unlike with pointers, that NULL is not a possible value. But, as show above, NULL is a possible value. So where is the error? In the language spec? (Unlikely.) Is the compiler in error for allowing that? Is that coding guide in error (or a little ambiguous)? Or am I just wandering into the minefield known as undefined behavior?

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• Compiler construction and DirectX

  - by otkins

  Hi! I am a beginner in the process of designing and coding a project, I already have all the ideas on my head, but I have a problem impeding me of continuing this project. I feel the code is ugly and unreadable and I cannot continue it this way. The project is a programming language I have on my mind, and it has small graphics capabilities. Even being beginner, I want to code it using DirectX because everybody wants it. And I want to code it entirely, not depend on any wrapper libraries like SDL. I did a refactoring of the DirectX module and it exposed all the weaks. There is Direct3D code everywhere, but the code itself does very little! I would start building a project like this using DirectX or I should use just GDI and the Multimedia API of Windows? This is a good progress for a beginner?

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• Slow server response time - CakePHP

  - by Hasan

  I am using CakePHP 1.2 for building a website. The problem i am facing is when ever a page loads it takes a lot of time in "waiting for www.example.com". The server response time is very slow. First i thot it was my database queries, but they were executing in less than seconds time. Next i also contacted the server people. They told it was not the server. Now i am stuck very badly with "waiting for www.example.com". Is the problem is in coding or the cakePHP is mis configured. Need help badly and fast. Thanks

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• PHP no wait sem_acquire?

  - by SerEnder

  Not a specific code question, but more of a general coding question. I'm trying to use a semaphore in a work project to limit the number of users that can access certain processes at a concurrent time. From my understanding the following: $iKey = ftock($sSomeFileLocation,'sOneCharacterString'); //Generate the key if($sem_id = sem_get($iKey){ //1 user allowed if(sem_acquire($sem_id)){ //Do the limited process here sem_release($sem_id); } } The problem that I see here is that if there is already one user who has the semaphore key, then the next user just waits until the first user is done rather than just faulting out. Anyone know of a way that if the max_acquire number has been reached, sem_acquire (or similar) will just return false? Thanks

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• why Facebook followers not shown in Safari & IE8 [ Internet Explorer 8] Browser :( ?

  - by Vaibhav Bhalke

  Hello Everybody We integrated facebook in our web application[Java GWT]. Facebook page followers shown in Mozila firefox 3.07 and Google :) but not shown in Safari and IE8 :( we used following script in our Java coding to show facebook page followers[Like]: < script type='text/javascript' src='http://static.ak.connect.facebook.com/js/api_lib/v0.4/FeatureLoader.js.php/en_US'< /script < script type='text/javascript' FB.init('MY_APP_ID');< /script < fb:fan profile_id=\"MY_PAGE_ID\" stream=\"0\" connections=\"10\" logobar=\"0\" width=\"244\" height=\"240\" css='http://127.0.0.1/myWebApplicationName/facebook.css?1'< /fb:fan what's the problem? what changes will need to fb page followers in all browser? Is there any Solution to Show facebook page followers to All browser? please provide solution ASAP? Thank you in Adavance !!!

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• Lots of pointer casts in QGraphicsView framework and performance

  - by kleimola

  Since most of the convenience functions of QGraphicsScene and QGraphicsItem (such as items(), collidingItems(), childItems() etc.) return a QList you're forced to do lots of qgraphicsitem_cast or static_cast and QGraphicsItem::Type() checks to get hold of the actual items when you have lots of different type of items in the scene. I thought doing lots of subclass casts were not a desirable coding style, but I guess in this case there are no other viable way, or is there? QList<QGraphicsItem *> itemsHit = someItem->collidingItems(Qt::IntersectsItemShape); foreach (QGraphicsItem *item, itemsHit) { if (item->type() == QGraphicsEllipseItem::type()) { QGraphicsEllipseItem *ellipse = qgraphicsitem_cast<QGraphicsEllipseItem *>(item); // do something } else if (item->type() == MyItemSubclass::type()) { MyItemSubClass *myItem = qgraphicsitem_cast<MyItemSubClass *>(item); // do something } // etc } The above qgraphicsitem_cast could be replaced by static_cast since correct type is already verified. When doing lots of these all the time (very dynamic scene), will the numerous casting affect performance beyond the normal if-else evaluation?

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• Better understanding of my SQL transactions

  - by Slew Poke

  I just realized that my application was needlessly making 50+ database calls per user request due to some hidden coding -- hidden in the sense that between LINQ, persistence frameworks and events it just so turned out that a huge number of calls were being made without me being aware. Is there a recommended way to analyze individual transactions going to my SQL 2008 database, preferably with some integration to my Visual Studio 2010 environment? I want to be able to 'spy' on individual transactions being made, but only for certain pieces of my code, and without making serious changes to either the code or database.

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• wxpython : button covers all in the frame

  - by Prakash

  Below is my code: #!/usr/bin/python # -*- coding: utf-8 -*- import wx class Example(wx.Frame): def __init__(self): #super(Example, self).__init__(parent, title=title, size=(300, 200)) wx.Frame.__init__(self, None, wx.ID_ANY, 'wxButton', pos=(300, 150), size=(320, 250)) self.button1 = wx.Button(self, id=-1, label='Button1', pos=(8, 8), size=(10, 20)) self.button1.Bind(wx.EVT_BUTTON, self.button1Click) self.Centre() self.Show() def button1Click(self,event): #self.button1.Hide() self.SetTitle("Button1 clicked") if __name__ == '__main__': app = wx.App() Example() app.MainLoop() Actually I am expecting the button1 on the frame to have a look like a button - a bit raised and be placed in center of frame - but it is just expanding to the full frame. Also text Button1 looks like a text which does not has a button look like feeling? What wrong am I doing?

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• gVim and multiple programming languages

  - by Abhi

  My day job involves coding with Perl. At home I play around with Python and Erlang. For Perl I want to indent my code with two spaces. Whereas for Python the standard is 4. Also I have some key bindings to open function declarations which I would like to use with all programming languages. How can this be achieved in gVim? As in, is there a way to maintain a configuration file for each programming language or something of that sort?

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• .Net Round-trip Types

  - by Fujiy

  I making a method that generate a unique string key for some parameters. But the same key if call with same values. I just accept primitive types, string, DateTime, Guid, and Nullable(since I append types together, I can distinguish who is int and who is int?), because I can convert all to string without lost values or precision.(for float and double a use ToString("R"), to DateTime ToString("O")). Exists a easy way to know which types I can transform in strings without conflict? And how do this transform(how I said before, float, double and datetime have specific ways) Thanks

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• Warn user when new data is inserted on database

  - by João Menighin

  I don't know how to search about this so I'm kinda lost (the two topics I saw here were closed). I have a news website and I want to warn the user when a new data is inserted on the database. I want to do that like here on StackOverflow where we are warned without reloading the page or like in facebook where you are warned about new messages/notifications without reloading. Which is the best way to do that? Is it some kind of listener with a timeout that is constantly checking the database? It doesn't sounds efficient... Thanks in advance.

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• Finding the heaviest of N objects using M scales

  - by cpprulez

  We have N objects and M scales. It's up to us what the objects are, and we need to position the objects on the scales so that it is undoubtful which is the heaviest object. For example, if we have 3 objects: "a", "b", "c" and 2 scales, one possible solution is "a" "b", "b" = "c" (here "a" is the heaviest). I need an algorithm which generates such solutions given N and M. Also let's assume that "a" is always the heaviest object. I've lost a few hours figuring out how to do it, but no matter what I figure out, there's always cases which I miss. For example, another solution is: "a" + "c" = 2 * "b", "a" "c".

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• How to use these ruby based CSS stylsheet frameworks languages?

  - by metal-gear-solid

  I read about many CSS related languages and tools which need ruby. What is the purpose of these languages and tool how these can save time and improve our CSS coding. What is the role in ruby language in these languages and tool. Will i have to install and learn ruby language to use these languages and tool. will i need ruby installed on webserver where website will be hosted. I'm talking abut these languages http://lesscss.org/ http://sass-lang.com/ http://compass-style.org/ some mentioned here: http://www.ruby-toolbox.com/categories/css_frameworks.html I'm on Windows XP PC , How can i use these Ruby based languages and which is preferred? I don't know ruby language.

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• background picture for textview

  - by AndyAndroid

  Hi, I have a textview and a nine-patch image. Assigning this image in the xml editor to the tag "background" works as desired. Now I want to set this image dynamically in the coding, I thought myTextView.setBackgroundDrawable(mydrawable); would be the right thing to do. My png is in res/drawable. The API says that mydrawable needs to be an object of type drawable R.drawable.myninepatch is of type int. So my problem is that I have to convert from that int to a drawable somehow. Then I thought I can use a constructor NinePatchDrawable mydrawable = new NinePatchDrawable(); But I am again not able to construct such an object. Anyone an idea? Thanks.

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• Server RAID 5 failed...all I have left is my compiled website

  - by David Murdoch

  Yesterday, 2 of the 3 drives in my dev server's RAID 5 decided to die on me (with no warning). I've come to grips with the fact that my data is most likely lost unless I shell out some major bucks for professional data-resortoration. People, don't be an idiot like me and treat your RAID as a data backup! Luckily I published the site about 4 hours before my files went bye-bye. Is there any way to run some [magical] program to restore my compiled site to their original files? Also: I develop on one machine with the files stored on the server...is there some visual studio 2010 web cache on my local machine (the one that didn't crash) that I may be able to use?

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• java.lang.NoClassDefFoundError when the file is there

  - by tsOverflow

  I've tried to look around for postings that might help me, cant find any. I am deploying an ear to JBoss4 server, and I started having this problem since I added a new project. this new project is defined as Java project in eclipse, and the EAR project has an EJB project that has the new Java project as one of the projects as its dependent upon - if deployed on JBoss locally through eclipse, there's no problem and everything goes smoothly But when being deployed to JBoss in test environment (outside eclipse), kept getting java.lang.NoClassDefFoundError on one of the classes that are defined in the new Java project. I looked inside the EAR file to get to the jar (EJB project), and then inside the jar, I can see the directory structure and all the class files from the new Java project - ie. The class that it complains about is right there inside the EAR-JAR and matching the exact structure that it's looking for. I am at lost to what else I can look at. Any pointers are greatly appreciated! Thanks

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• Erlang Question - Time order of messages

  - by Aiden Bell

  Read (skimmed enough to get coding) through Erlang Programming and Programming Erlang. One question, which is as simple as it sounds: If you have a process Pid1 on machine m1 and a billion million messages are sent to Pid1, are messages handled in parallel by that process (I get the impression no) and(answered below) is there any guarantee of order when processing messages? ie. Received in order sent? If so, how is clock skew handled in high traffic situations for ordering? Coming from the whole C/Thread pools/Shared State background ... I want to get this concrete. I understand distributing an application, but want to ensure the 'raw bones' are what I expect before building processes and distributing workload. Also, am I right in thinking the whole world is currently flicking through Erlang texts ;)

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• Which is the future of web development: HTML5 or Silverlight(or other RIA framework)?

  - by Morgan Cheng

  My colleagues have a heated debate on what is the future of web development. One side is supporting HTML5 and the other is supporting Silverlight. There is no conclusion of the debate yet. In my humble opinion as a programmer, HTML5 will not improve programming productivity, while Silverlight will. In my understanding, programmers still need to program in JavaScript to take advantage of HTML5. For Silverlight, we can use C# which is static-type language. A lot of coding defects can be found in compilation time. For HTML5, different browsers might still have different behavior even though there is spec. For Silverlight, generally what works in IE will work the same way in other browsers. Just my thoughts. Any idea on how to choose future direction of web development?

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• MVC way of handling data input

  - by korki

  I have a data input module where I add the information of my product and its sub information like: product basic info product price info product price details price info and price details are related to product and are lists In my web forms approach I would store my main product object on the view state and I would populate it's pricing info and details while doing ajax postbacks. This way I can create a compact module that is very user friendly in terms of defining a lot of data from one place without the need to enter these data from seperate modules. And when I am done I would do one product.save() and that would persist all the data to the respective tables on db. Now I am building similar app on .net mvc framework and pondering on what would be the good way of handling this on mvc. I don't resonate towards storing all this on client side till I click save. And saving to the db after each action makes me remember the days I was coding on asp. Will appreciate your inputs on ways to approach this on mvc framework

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