Search Results

Search found 19768 results on 791 pages for 'hardware programming'.

Page 634/791 | < Previous Page | 630 631 632 633 634 635 636 637 638 639 640 641  | Next Page >

• Client / Server security from mobile to website

  - by Amir Latif

  Hey. Am new to the world of web programming and learning a bunch of fairly simple new pieces of tech, trying to piece them all together. So, we have a simple client (currently iPhone, to move to J2ME soon) that's pulling down lists of data via PHP, which is talking to a MySQL db. I have a rudimentary user/login system so that data is only served to someone who matches a known user etc, either on the website or on the client. All the php scripts on the website that query the DB check to make sure an active session is in place, otherwise dumping the user back to the login screen. I've read a little about SSL and want to know if that is sufficient to protect the website AND the data passing between the server and the client?

  Read the article

• VST plugin : using FFT on audio input buffer with arbitrary size, how ?

  - by Led

  I'm getting interested in programming a VST plugin, and I have a basic knowledge of audio dsp's and FFT's. I'd like to use VST.Net, and I'm wondering how to implement an FFT-based effect. The process-code looks like public override void Process(VstAudioBuffer[] inChannels, VstAudioBuffer[] outChannels) If I'm correct, normally the FFT would be applied on the input, some processing would be done on the FFT'd data, and then an inverse-FFT would create the processed soundbuffer. But since the FFT works on a specified buffersize that will most probably be different then the (arbitrary) amount of input/output-samples, how would you handle this ?

  Read the article

• How do you make your Java application memory efficient?

  - by Boune

  How do you optimize the heap size usage of an application that has a lot (millions) of long-lived objects? (big cache, loading lots of records from a db) Use the right data type Avoid java.lang.String to represent other data types Avoid duplicated objects Use enums if the values are known in advance Use object pools String.intern() (good idea?) Load/keep only the objects you need I am looking for general programming or Java specific answers. No funky compiler switch. Edit: Optimize the memory representation of a POJO that can appear millions of times in the heap. Use cases Load a huge csv file in memory (converted into POJOs) Use hibernate to retrieve million of records from a database Resume of answers: Use flyweight pattern Copy on write Instead of loading 10M objects with 3 properties, is it more efficient to have 3 arrays (or other data structure) of size 10M? (Could be a pain to manipulate data but if you are really short on memory...)

  Read the article

• Exclusive compute mode with OpenCL+NVidia

  - by lokli

  Hi, I have a question to exclusive compute mode with NVidia+OpenCL. I can set up exclusive compute mode (page 74 from cuda programming guide 3.0) with nvidia-smi on a nvidia-gpu . that means, only one program can compute on gpu. cuda runtime schedules than app automatically. but I have a problem with opencl-programs in this case: if one application runs on a gpu with setted exclusive compute mode and second opencl-program calls clGetDeviceInfo(..., CL_DEVICE_AVAILABLE, ...) with the same GPU is the result == CL_TRUE. After that if opencl-app tries to create a context on this device, than crashes the running app (both). How can i find out an available GPU with OpenCL? Thanks.

  Read the article

• Has anybody managed to teach themself strong OOP skills through mainly developing with JavaScript?

  - by yaya3

  I am trying to do this, I'm a full time front-end dev and am aware that I am struglling to achieve this. When I am referring to OOP skills I am referring to understanding and being familiar with concepts like inheritance, polymorphism, encapsulation, abstaction. I am aware that it may be more likely to achieve what I'm after by focusing on another language in my spare time. This is the plan, but I'd be really intrigued to hear if anybody has managed to achieve this purely through JavaScript and how you did it. It'd be even better to hear from strong OOP developers from who use different programming languages to know if they have worked with developers who have managed to achieve this.

  Read the article

• Why does it not allowed to use try-catch statement without {} ?

  - by alex

  Why can't I use code like this ? 1 int i = 0; try i = int.Parse("qwerty"); catch throw; 2 try i = int.Parse("qwerty"); catch; finally Log.Write("error"); And should write like this 1 int i = 0; try { i = int.Parse("qwerty"); } catch { throw; } 2 try { i = int.Parse("qwerty");} catch {} finally {Log.Write("error");} PS: I can use if-else statement without {}. Why should I use them with try-catch(-finally) statement ? Is there any meaningful reason ? Is it only because that some people think that code is hard to read ? Several months ago I asked that question on russian programming forum but I got no satisfactory answer ...

  Read the article

• Developing a sector based partition copying program?

  - by baltusaj

  Hi, I want to develop a program that copies a partition's 'data' only, to another partition. And I want to do it such that the program starts from the first sector of source partition and checks if a sector is used. If it is used copy it to the destination parition. Else don't copy. In other words it's like copying only the contents of a partition to another, sector-by-sector. Question: Is there a way to check if a particular sector on harddisk is used or not? The programming language I am using is C++ and the underlying filesystem in NTFS. Thanks a lot.

  Read the article

• Copying blocks (ie: copying them to instance variables) in Objective-C

  - by RyanWilcox

  I'm trying to understand blocks. I get how to use them normally, when passed directly to a method. I'm interested now in taking a block, storing it (say) in an instance variable and calling it later. The blocks programming guide makes it sound like I can do this, by using Block_copy / retain to copy the block away, but when I try to run it I crash my program. - (void) setupStoredBlock { int salt = 42; m_storedBlock = ^(int incoming){ return 2 + incoming + salt; }; [m_storedBlock retain]; } I try to call it later: - (void) runStoredBlock { int outputValue = m_storedBlock(5); NSLog(@"When we ran our stored blockwe got back: %d", outputValue); [m_storedBlock release]; } Anyone have any insights? (Or, is there something I'm not getting with blocks?) Thank you very much!

  Read the article

• How to convert a MooTools 'Scroll to Top' Script to jQuery

  - by Vikram

  Hello friends I have the following script in my Template: window.addEvent('domready', function () { var a = $('totop'); if (a) { var b = new Fx.Scroll(window); a.setStyle('outline', 'none').addEvent('click', function (e) { new Event(e).stop(); b.toTop() }) } }); I wanted this in jQuery as I don't want to load 2 libraries just for this bit of script. I am actually very new to programming and still in the learning stage. Hence looking forward for some help on this issue. Kindly Help.

  Read the article

• java timer and socket problem

  - by Guru

  Hi there, I'm trying to make a program which listens to the client input stream by using socket programming and timer but whenever timer executes.. it gets hanged Please help me out here is the code... private void jButton1MouseClicked(java.awt.event.MouseEvent evt) { // TODO add your handling code here: try { ServerUserName=jTextField1.getText(); ss=new ServerSocket(5000); jButton1.enable(false); jTextArea1.enable(true); jTextField2.enable(true); Timer t=new Timer(2000, new ActionListener() { public void actionPerformed(ActionEvent e) { try { s=ss.accept(); InputStream is=s.getInputStream(); DataInputStream dis=new DataInputStream(is); jTextArea1.append(dis.readUTF()); } catch(IOException IOE) { } catch(Exception ex) { setLbl(ex.getMessage()); } } }); t.start(); } catch(IOException IOE) { } } Thanks in advance

  Read the article

• Universal syntax file format?

  - by Isaiah

  Hey as a project to improve my programing skills I've begun programing a nice code editor in python to teach myself project management, version control, and gui programming. I was wanting to utilize syntax files made for other programs so I could have a large collection already. I was wondering if there was any kind of universal syntax file format much in the same sense as .odt files. I heard of one once in a forum, it had a website, but I can't remember it now. If not I may just try to use gedit syntax files or geany. thanks

  Read the article

• Visual Studio Add-in Exec running Automatically

  - by NewProgrammer

  Hey guys, I have a dilemma that I am uncertain about, as I not sure if it's is exactly possible for a Visual Studio Add-in to run its code automatically. I need an add-in that can run passively, like a logger for Visual Studios. However, the Exec method that I know so far can only execute commandbar functionality, but I need the code to execute when the user right-clicks, or select a line of text. I was able to make an automatic logger if i put my code in the "querystatus", but that would be considered bad programming, and it does not log when I simply select a piece of text. Does anyone know how to make a passive or automatic running code in Visual Studios?

  Read the article

• Any active Bold for Delphi users ?

  - by Roland Bengtsson

  What are you using as a persistance framework when programming in Delphi? If the application is growing it soon became really complicated to handle the model in SQL ? Bold is a persistance framework for Delphi win32 that really deserve more attention. I use it daily and using OCL instead of SQL to get data from the database saves a lot of time and debugging. When the model is changed Bold translate this to an SQL script and change the database. EDIT: For those that are interested in Bold for Delphi I have spend this evening on create a site on Google about it. I'm not a guru in html so the design is maybe not so exciting. But I want comments and reactions about the site. You can leave the comments in this thread or at the bottom on the subpage. And the address is... http://sites.google.com/site/boldfordelphi/

  Read the article

• Calculating very large exponents in python

  - by miraclesoul

  Dear All, Currently i am simulating my cryptographic scheme to test it. I have developed the code but i am stuck at one point. I am trying to take : g**x where g = 256 bit number x = 256 bit number Python hangs at this point, i have read alot of forums, threads etcc but only come to the conclusion that python hangs, as its hard for it to process such large numbers. any idea how can it be done? any two line piece of code, any library, anything that can be done.(ALSO PLEASE I AM A NEW PYTHON USER AND THIS IS FIRST TIME I DID PROGRAMMING IN IT, SO NO COMPLEX METHODS ...HOPE YOU UNDERSTAND :s)

  Read the article

• how is a macro expanded in clojure?

  - by john wang

  In the book Programming Clojure(Stuart), when read how macros are expanded I got confused. user=> (defmacro chain ([x form] (list '. x form)) ([x form & more] (concat (list 'chain (list '. x form)) more))) #'user/chain The above macro can be expanded as: user=> (macroexpand '(chain a b c)) (. (. a b) c) But the following is only expanded to the first level: user=> (macroexpand '(and a b c)) (let* [and__3822__auto__ a] (if and__3822__auto__ (clojure.core/and b c) and__3822__auto__)) The and macro source: user=> (source and) (defmacro and([] true) ([x] x) ([x & next] `(let [and# ~x] (if and# (and ~@next) and#)))) Why is the chain macro expanded all the way but the and not ? Why is it not expanded to something like the following: user=> (macroexpand '(chain a b c d)) (. (chain a b c) d)

  Read the article

• Bit conversion operations in PHP

  - by Goro

  Hello, I find myself in need of performing bit-level conversion on variables in PHP. In more detail, I have a bit stream that is read as an integer by hardware, and I need to do some operations on the bits to make it into what its actually supposed to be (a float). I have to do this a few times for different formats, and the functionality I need is Being able to select and move individual bits in a variable Being able to cast statically one type of variable to the other (ie. int to float) I know php natively supports bitwise AND, OR, etc, and shift operations, but I was wondering if: there may already be a library in php that does this sort of thing I would be better off with delegating the calculations to some other language Thanks,

  Read the article

• IOS SDK : first advices for beginners

  - by VdesmedT

  I too often answer the same kind of questions regarding basic topics like memory management, UITableView, Interface Orientation, MVC, etc... I understand very well that everyone starting with that SDK is too exited about getting its hand on it but a few reading would save them hours of debugging and the frustration that come along with the feeling that "We miss something here". I'd like experience users to share the few small articles, white papers, docs, book chapters that helps other save their time and avoid frustration. My first vote would be for : IOS Memory Management Guide View Controller Programming Guide Table View Guide And as a General recommendation, read the Overview section that come along with every class documention in the reference library, they contains most of what you need to know to avoid big traps !

  Read the article

• Is this a correct iText design?

  - by Lucas

  I´m making some pdf reports to be used on a web app. I wonder if the way I´m taking to make the designs is appropriated. This would be a screenshot of the way I´m doing the things. As you can see, I´m using tables to position everything in the document. I think this is a pretty much similar design to HTML. But I want to know is there is a better way to get the same result I got. This is the document without cell borders: I could post the code if necessary. By the way, why should I spend long hours programming these kind of stuff with iText tool when I could do things faster and maybe better looking with iReport? I like iText, it´s just a question. Sorry for my english and thanks!

  Read the article

• What's the benefit of calling new on an object instance?

  - by Geo

  I'm reading [Programming Perl][1], and I found this code snippet: sub new { my $invocant = shift; my $class = ref($invocant) || $invocant; my $self = { color => "bay", legs => 4, owner => undef, @_, # Override previous attributes }; return bless $self, $class; } With constructors like this one, what's the benefit of calling new on an object instance? I assume that it's what it's for, right? My guess is that if anyone would want to write such a constructor, he would have to add some more code that copies the attributes of the first object to the one about to be created.

  Read the article

• printing out posts

  - by yCalleecharan

  Hi, I'm using the Firefox browser and trying to print out my posts (and replies). The pdf output doesn't include the comments in the posts. How to make sure that everything which is on the page gets printed? Same goes for codes for which are in a window. Only the visible part of the code gets printed. These are not programming questions :) but I hope that someone can suggest how to get proper printouts of the posts. Thanks a lot...

  Read the article

• Manipulate Excel workbooks programmatically

  - by Tom

  I have an Excel workbook that I want to use as a template. It has several worksheets setup, one that produces the pretty graphs and summarizes the numbers. Sheet 1 needs to be populated with data that is generated by another program. The data comes in a tab delimited file. Currently the user imports the tab delimited file into a new Workbook, selects all and copies. Then goes to the template and pastes the data into sheet1. This is a large amount of data, 269 columns and over 135,000 rows. It’s a cumbersome process and the users are not experienced Excel users. All they really want is the pretty graphs. I would like to add a step after the program that generates the data to programmatically automate the process the user currently must do manually. Can anyone suggest the best method/programming language that could accomplish this?

  Read the article

• Sprintf equivalent in Mathematica?

  - by jxy

  I don't know why Wikipedia lists Mathematica as a programming language with printf. I just couldn't find the equivalent in Mathematica. My specific task is to process a list of data files with padded numbers, which I used to do it in bash with fn=$(printf "filename_%05d" $n) The closest function I found in Mathematica is PaddedForm. And after some trial and error, I got it with "filename_" <> PaddedForm[ Round@#, 4, NumberPadding -> {"0", ""} ]& It is very odd that I have to use the number 4 to get the result similar to what I get from "%05d". I don't understand this behavior at all. Can someone explain it to me? And is it the best way to achieve what I used to in bash?

  Read the article

• JVM specification and Java compiler code useful for SCJP preparation ?

  - by BenoitParis

  I'm preparing the SCJP exam with the almost official study book ("SCJP Sun Certified Programmer for Java 6 Exam 310-065") I understand that Java programming is writting code that fulfills a certain high-level contract; So that Java can stay platform-independent. However, I have trouble understanding and remembering things when it comes to highly specific SCJP items (and they are numerous) The book stays high-level and does not provide examples of how one compiler would handle things. This is the same thing for runtime issues (JVM level): things are too much abstract for me. Rules often seems arbitrary and therefore, with no well defined purpose, are difficult to remember. Or maybe it's that sometimes I just don't get the underlying purpose. And here is the question: Would a JVM specification and/or some java compiler code help in preparing the SCJP? Have you had the need for such material or is the book sufficient enough? Also, please share the resources you used, apart from the book.

  Read the article

• Somewhat newb question about assy and the heap.

  - by Eric M

  Ultimately I am just trying to figure out how to dynamically allocate heap memory from within assembly. If I call Linux sbrk() from assembly code, can I use the address returned as I would use an address of a statically (ie in the .data section of my program listing) declared chunk of memory? I know Linux uses the hardware MMU if present, so I am not sure if what sbrk returns is a 'raw' pointer to real RAM, or is it a cooked pointer to RAM that may be modified by Linux's VM system? I read this: How are sbrk/brk implemented in Linux?. I suspect I can not use the return value from sbrk() without worry: the MMU fault on access-non-allocated-address must cause the VM to alter the real location in RAM being addressed. Thus assy, not linked against libc or what-have-you, would not know the address has changed. Does this make sense, or am I out to lunch?

  Read the article

• What should i do to practise?

  - by simion

  Hi guys I start a year long industrial placement in september where i will be coding in java predominantly. I am going to use the summer to brush up on my java as in year one of the degree java was the main language taught for OOP modules. However this year i have had no java exposure except for an algorithms module, which was one of eight, so as you can see i am probably getting really rusty!. What i wanted to know is, how does the "real world" java programming differ from university coding and what do you suggest i brush up on that would be different to my normal workings. As a start i definatley need to get familiar with a professional IDE like netbeans, opoosed to havign used BlueJ throughout but more specifically what coding practises should i get more familiar with I appreciate they wont expect me to be a qualified full developer and will give me time, but i would like to hit the ground running as it were, with me having full hopes to secure a perminant position after i finish my degree. Thanks for reading

  Read the article

< Previous Page | 630 631 632 633 634 635 636 637 638 639 640 641  | Next Page >