Search Results

Search found 12141 results on 486 pages for 'basic skills'.

Page 337/486 | < Previous Page | 333 334 335 336 337 338 339 340 341 342 343 344  | Next Page >

• Why is UDP + a software reliable ordering system faster than TCP?

  - by Ricket

  Some games today use a network system that transmits messages over UDP, and ensures that the messages are reliable and ordered. For example, RakNet is a popular game network engine. It uses only UDP for its connections, and has a whole system to ensure that packets can be reliable and ordered if you so choose. My basic question is, what's up with that? Isn't TCP the same thing as ordered, reliable UDP? What makes it so much slower that people have to basically reinvent the wheel?

  Read the article

• Get the co-ordinates of a touch event on Android

  - by Joe

  Hi, I'm new to Android, I've followed the hello world tutorial through and have a basic idea of what's going on. I'm particularly interested in the touch screen of my T-Mobile Pulse so just to get me started I want to be able to write the co-ordinates of a tocuh event on the screen, so say the user touched the co-ordinate 5,2 - a textview on the screen would display that. At present I have a simple program that just loads an xml file which contains the textview I intend to write the co-ordinates in. Thank you in advance, I did Google for help and searched stackoverflow but everything I found either went way over my head or wasn't suitable for this. Cheers.

  Read the article

• C++ pointer, Beginner Question...

  - by BobAlmond

  Hi there, just want to ask a beginner question... here, I made some code, for understanding the concept/basic of pointer: int a=1; int *b=&a; int **c = &b; int ***d = &c; cout << &*(&*d) << endl; can someone explain to me, why the &*(&d) return address of "c" instead of address of "b"? I've also tried code like &(&(&(&*(&*d)))), but it keep return address of "c" Thanks a lot :)

  Read the article

• is there an equivalent to a "Focus Listener" in Objective-C or iPhone SDK? (Coming from Java)

  - by MarcZero

  Hello. I am a student programmer who has taken up Objective-C on my free time as my college doesn't teach it. We have only used Java and basic C so far. I am in the middle of making a program for the iPod and was wondering if there was any type of way to call a method in a class similar to the way a Focus Listener does in Java? I have a view that I would like to call a refresh method (to update the newly inputted titles of buttons from another view) when the view is put at the top and visible again. Is this too easy or is there a more methodical way of doing that? I have tried to just call the method from the other view class but it does not seem to work (says the other class is either undefined or may not accept the method call and crashes on execution). Any insight would be appreciated. Thank you for your time.

  Read the article

• Best way to create a Unique ID field for an enum

  - by jax

  What is the best way to get a Unique ID from an ENUM that will stay consistent between repeated execution of the program? Currently I am doing this manually by passing an ID to the enum constructor. I don't really want to do this is I can help it. Another option would be to use a static field that gets incremented for each enum value. The problem is that if later I decide to move the enum fields around or delete some this will cause problems with my program as the ID will be saved into user preferences. The ID can be any basic type or a String.

  Read the article

• && (AND) and || (OR) in Java IF statements

  - by Azimuth

  My question might be very basic but still I think it worths to ask. I have the following code: if(!partialHits.get(req_nr).containsKey(z) || partialHits.get(req_nr).get(z) < tmpmap.get(z)){ partialHits.get(z).put(z, tmpmap.get(z)); } where partialHits is a HashMap. What will happen if the first statement is true? Will Java still check the second statement? Because in order the first statement to be true, the HashMap should not contain the given key, so if the second statement is checked, I will get NullPointerException. So in simple words, if we have the following code if(a && b) if(a || b) would Java check b if a is false in the first case and if a is true in the second case?

  Read the article

• Why can't I project ToString() in VB?

  - by Martinho Fernandes

  If you try to compile the query below in Visual Basic .NET, it fails. From x In {1, 2} Select x.ToString() The error given by the compiler is: Range variable name cannot match the name of a member of the 'Object' class. There is nothing wrong with the equivalent C# query, though: from x in new[]{1, 2} select x.ToString() This does not happen with the ToString overload that takes a format (it is a member of Int32, not Object). It does happen with other members of Object, as long as they don't take an argument: with GetType and GetHashCode it fails; with Equals(object) it compiles. Why is this restriction in place, and what alternatives can I use?

  Read the article

• WIN32 visual c++

  - by mrbuxley

  I would like to write a simple program in c++. After the program is done i would like to get my answers in form of a graph or picture that would give some certain information if i click on a certain area. i have only written console apllications in c++ before and don't really have a clue where to start with the graphic part of it all. Can I write the first part of the program in console mode and some how run it under the WIN32 later? for ex what will happen to the cout<<"foo"; commands? Is there a simpler approach to do some very basic graphic programming.

  Read the article

• Is keeping uploads folder outside of 'public_html' enough to keep my application secure from malicio

  - by ecu

  Although I realise there are different approaches to securing upload process, I'm still confused when it comes to basic principles. I want to allow users to upload any kind of file they want, but keep my app secure. So my question is: Is it sufficient to store the files with their original names in 'uploads' folder outside 'webroot' and fetching them via some download.php script? If it't not secure enough, please point me in the right direction, or suggest what additional steps I should take to make it safe. Thank you.

  Read the article

• emacs debugger: how can I step-out, step-over ?

  - by Cheeso

  I don't know why I'm having so much trouble groking the documentation for the elisp debugger. I see it has a commands to "step-into" (d). But for the life of me, I cannot see a step-out or step-over. Can anyone help? If I have this in the Backtrace buffer: Debugger entered--returning value: 5047 line-beginning-position() * c-parse-state() * byte-code("...") * c-guess-basic-syntax() c-show-syntactic-information(nil) call-interactively(c-show-syntactic-information) ...where do I put the cursor, and what key do I type, to step out of the parse-state() fn ? by that I mean, run until that fn returns, and then stop in the debugger again.

  Read the article

• How do I automatically reset a boolean when any method other is called in C#?

  - by gtaborga

  Hey everyone, Using C#, I need to do some extra work if function A() was called right before function C(). If any other function was called in between A() and C() then I don't want to do that extra work. Any ideas that would require the least amount of code duplication? I'm trying to avoid adding lines like "flag = false;" into every function B1..BN. Here is a very basic example: bool flag = false; void A() { flag = true; } void B1() { ... } void B2() { ... } void C() { if (flag) { //do something } } The above example was just using a simple case but I'm open to using something other than booleans. The important thing is that I want to be able to set and reset a flag of sorts so that C() knows how to behave accordingly. Thank you for your help. If you require clarification I will edit my post.

  Read the article

• Google App Engine & Django Sandbox: Shell and Web seem to be using different datastores?

  - by tones

  I'm new to both Django and Google App Engine, and am using a sandbox in OSX10.6 with the GoogleAppEngineLauncher. I've got a basic "bookstore" application running from the tutorial in the OReilly "Programming Google App Engine" book. Here's the bug: If I add a new object to the datastore through the web interface, then it's readable through the web interface, but does not appear to exist if I query the datastore through the shell. Vice versa: If I add an object in the shell, then I can read it from the shell, but it doesn't appear in the web interface. Any thoughts or theories would be welcome. Thanks! =T=

  Read the article

• Check if an object is order-able in python?

  - by sortfiend

  How can I check if an object is orderable/sortable in Python? I'm trying to implement basic type checking for the __init__ method of my binary tree class, and I want to be able to check if the value of the node is orderable, and throw an error if it isn't. It's similar to checking for hashability in the implementation of a hashtable. I'm trying to accomplish something similar to Haskell's (Ord a) => etc. qualifiers. Is there a similar check in Python?

  Read the article

• Error message: "$(window).width is not a function"

  - by Crippletoe

  Hi all, i am trying to use a jQuery scrollbar called "Jscrollhorizontalpane". when i am trying to use it i get the following error message: "$(window).width is not a function" in firebug's console. i am new to jQuery do this might be very basic but still, i dont know what that means and why there is a problem. the scroller comes in a bundle with a few files, one of which is called "jScrollHorizontalPane.js" and i believe it holds the code for the scroller. i tried replacing $ signs there with the word "jQuery" (in case there is a conflict) but it didnt seem to help. also important to add that on the same page i am using another jQuery scroller (a vertical one as opposed to the horizontal on mentioned above) which works just fine and when i examined it's .js file, i could spot lines with "$(window).width". any ideas?

  Read the article

• How to calculate end-point at a given center plus an radius and angle?

  - by mystify

  I'm trying to do some basic quartz core drawing with arcs, but have an F in math ;-) I have a point: CGPoint center = CGPointMake(100.0f, 100.0f); CGFloat radius = 50.0f; CGFloat startAngle = 20.0f / 180.0f * M_PI; CGFloat endAngle = 150.0f / 180.0f * M_PI; CGContextAddArc(c, center.x, center.y, radius, startAngle, endAngle, 0); Now I want to draw a little dot on the middle of the arc. I mean, not the center point, but the little curve (arc) which is made up between the angles 20-150 degrees. I looked into quartz but unfortunately, there seems no helper function to calculate this. Probably some hardcore trigonometric logic with atan and stuff of this kind needed?

  Read the article

• SQL Server FTS: possible to get information how/why rows were matched?

  - by jimmy_keen

  Is it possible to get the information why/how given row returned by FTS query was matched (or which substring caused row to match)? For example, consider simpliest table with id and text columns, with FTS index on the later one. SELECT * FROM Example WHERE CONTAINS(text, 'FORMSOF(INFLECTIONAL, jump)'); This examplary query could return, say row {1, 'Jumping Jack'}. Now, is it possible to somehow get information that this very row was matched because of 'Jumping' word? It doesn't even have to be exact information, more of a which substring caused row to match. Why I'm asking - I got C# app that builds up those queries basing on user input (keywords to search for), and I need the very basic information why/how row was matched back, to use further in C# code. If it's not possible, any alternatives?

  Read the article

• Is there any practical usage of Doubly Linked List, Queues and Stacks?

  - by Chouette

  I've been coding for quite sometime now. And my work pertains to solving real-world business scenarios. However, I have not really come across any practical usage of some of the data structures like the Linked List, Queues and Stacks etc. Not even at the business framework level. Of course, there is the ubiquitous HashTable, ArrayList and of late the List...but is there any practical usage of some of the other basic data structures? It would be great if someone gave a real-world solution where a Doubly Linked List "performs" better than the obvious easily usable counterpart.

  Read the article

• best practice for Jquery plugin implementation and resource locations

  - by ptutt

  This is probably a very basic question, but I seem to have issues plugging in jquery plug-ins. The issue seems to be around the location of the script, css and images and ensuring the css has the correct url to the images. The standard plug-in has the following folder structure (eg : JPicker) js css images My project is asp.net mvc so I have the default: scripts images content So, I try to split the jquery plugin to the appropriate folders (not sure if this is the best way?). Then I try to correct the references to images (background urls) in the css. I believe the url is relative to the page that is implementing the css file, not the location of the css file itself. Anyway, when I try the above, the plugins don't seem to work. I believe the issue lies with the images not being found. The jquery code runs without errors, so I assume that's not the problem. Any help/advice much appreciated

  Read the article

• Java - Count words in two documents

  - by user552961

  Good Morning - it is school assignment, I am not asking for any source code (if you can provide any pesudo code it would be awesome). Here is the problem :( I have to create a term frequency table. It is not pure TF, I just need to count the words and write down. I know basic steps to do it 1 - extract all terms (I can do it with file reader) 2 - remove repeating terms (I can do it with TreeMap) The output of 2nd step would be Niga, ponga, dinga, bitlo, etc. 3 - Now I have to see if there is any word in current file from above terms or not, if yes then I will count. Now this is my problem, I stucked on step 3 :( I have some idea how to count words with TreeMap (treemap.containskey etc.) but it would be global count not local count for each file :( Any pseudo code?

  Read the article

• C++ Iterators and inheritance

  - by jomnis

  Have a quick question about what would be the best way to implement iterators in the following: Say I have a templated base class 'List' and two subclasses "ListImpl1" and "ListImpl2". The basic requirement of the base class is to be iterable i.e. I can do: for(List<T>::iterator it = list->begin(); it != list->end(); it++){ ... } I also want to allow iterator addition e.g.: for(List<T>::iterator it = list->begin()+5; it != list->end(); it++){ ... } So the problem is that the implementation of the iterator for ListImpl1 will be different to that for ListImpl2. I got around this by using a wrapper ListIterator containing a pointer to a ListIteratorImpl with subclasses ListIteratorImpl2 and ListIteratorImpl2, but it's all getting pretty messy, especially when you need to implement operator+ in the ListIterator. Any thoughts on a better design to get around these issues?

  Read the article

• Enter custom file name to be read ?

  - by ZaZu

  Hello, I want to allow users to type the name of any .txt file to be read/written. This is my code : printf("Enter .txt file name\n"); scanf("%s",&fname); FILE *inputf; inputf=fopen(&fname,"w"); Problem is this method does not work (having &fname) as a parameter. I can imagine its because C needs "filename.txt" for it work ... even if I enter for example : "custom.txt", the program returns an error of "Storage block not big enough for this operation" What is the correct method to accomplish this ? Im using C and im pretty much using basic commands .. (not too advanced) Thanks alot !!!

  Read the article

• wordpress plugin for certain tweets

  - by darreee

  Hello I would need to get tweets from my twitter account on my wordpress site. Okey, the basics i could do, but there is one special need. I would need to get only certain tweets. Tweets that have some #hashstag for example only tweets with hashtag #myss would show up on my wordpress site. Is there ready made plugin for this? I have been googlein for hours but have found only basic/normal twitter plugins. Also i would need to able style the feed to look same as my current site. Cheers!

  Read the article

• See queries that hit SQL

  - by Shaded

  I have a really basic stupid easy question about sql... and I'll probably get -100 points... but here it goes anyway... Is there a way using sql 2008 Management Studio to look at the queries that hit the server? I'm trying to debug a program and I get messages like "Incorrect syntax near the keyword 'AND'". Since the queries are being dynamically generated it's a hassle to figure out what is going to the server. Any help is appreciated!

  Read the article

• Select products with users

  - by Ploppe

  I have not worked with SQL for quite a long time, and I need some help for a basic query. I have the three following tables: users (id, name) products (id, name) owners (userid, productid, date) One product can be sold by user A to user B and then back to A. Now, I want the list of all products currently owned by every single user with the date of transaction. Currently, my query is this one, but I'm stuck with old data (first association of one product to one user, and not the newest one): SELECT users.name, products.name, date FROM products JOIN owners ON products.id = owners.id JOIN users ON owners.id = user.id GROUP BY product.id Do you have some hints? Thanks

  Read the article

• Reading in MIPS external file so another file can use it?

  - by SkyWookie

  Hey all, I'm working on this final thing for my MIPS project and it's deceptively easy. I need to get a procedure (called feed) and let its main driver program use it by reading it in. I know that I'm supposed to use the call code 14 and .globl sym (I think) in order to feed it into the file and have it read it. I just need a basic tutorial or something, as I CANNOT find it on the Internet or in my book (just lists the call code, real helpful). Here's what I know: I need to use read, but I also need a file descriptor (don't know where to get it). I need to put the buffer in $a1 and the length in $a2. Well, that's about it. If there's any decent tutorial you could whip up or if there is one online that I don't see let me know please :). I just need a push in the right direction, I'm sure it can't be too difficult, just can't find any info on it!

  Read the article

< Previous Page | 333 334 335 336 337 338 339 340 341 342 343 344  | Next Page >