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  • Windows Physical Direct Memory Mapping

    - by chrisjleaf
    I'm a bit disappointed there is almost no discussion of this no matter where I look so I guess I'll have to ask. I'm writing a cross platform memory bench marking application which requires direct physical address mapping rather than virtual addressing. EDIT The solution would look something like the Linux/Unix system calls: int fd = open("/dev/mem", O_RDONLY); mmap(NULL, len, PROT_READ, MAP_SHARED, fd, PHYSICAL_ADDRESS_OFFSET); which will require the kernel to either give you a virtual page mapping to the desired physical address or return that it failed. This does require supervisor privileges but that is ok. I have seen a lot of information about shared memory and memory mapped files but all of these reside on disc and are thus not really useful when I'm trying to make a system dependent read. It is very similar to writing an IO driver although I do no need write permissions to the physical address. This site gives an example of how to do it on a driver level using the Windows Driver Kit: NT Insider: Sharing Memory between drivers and applications This solution would probably require Visual Studio which currently I do not have access to. (I have downloaded the WDK api but it complained about my use of GCC for Windows). I'm traditionally a Linux programmer so I'm hoping there might be something really simple I'm missing. Thanks in advance if you know something I don't!

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  • How can I obtain mp3 metadata to rename them? [closed]

    - by Blaze
    I am planing on writing an application using Vala. Its purposed is to import mp3 files from a location and rename them if necessary. The renaming information should be provided by the ID3 tags in the mp3 file such as the title and the number of the song. My target platform is Ubuntu (Linux). As the question says, I am searching for how can I achieve this on Vala. I think this functionality might be provided by Gstreamer.

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  • Class Versus Struct

    - by Prometheus87
    In C++ and other influenced languages there is a construct called Structure (struct) and we all know the class. Both are capable of holding functions and variables. some differences are 1. Class is given memory in heap and struct is given memory in stack 2. in class variable are private by default and in struct thy are public My question is that struct was somehow abandoned for Class. Why? other that abstraction, a struct can do all the same stuff a class does. Then why abandon it?

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  • Dependency Management tool for REST endpoints

    - by ShaggyInjun
    I work in a Rest Oriented envrionment. The number of endpoints is quite large and span multiple applications. The dependencies between the endpoints are large in number as well and not very well planned. Applications have cyclic dependencies amongst each other. Unfortunately, there is no central location where all the endpoints are documented and declare dependencies ( the endpoints that they inturn call ). Is there a tool that will help in such dependency management. I tried searching for a tool online, but not know what such a thing would be called, I am unable to find anything. P.S. Google only helps those who know what they need help with. :(

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  • Convert uploaded video files to mp4 using PHP [closed]

    - by Subin
    I created a PHP video uploading script. I need to convert these files to mp4 for HTML5 VIDEO PLAYER using PHP while uploading . How can I do that ? Here is the PHP code. <?php if(isset($_POST['submit'])){ $user=$_COOKIE['VisitorName']; include('config.php'); session_start(); $session_id='1'; //$session id $path = "/home/simsu/subins/videos/data/videos/"; $valid_formats = array("wmv", "ogv", "mp4", "3gp", "ogg"); if(isset($_POST) and $_SERVER['REQUEST_METHOD'] == "POST") { $name = $_FILES['uploadedfile']['name']; $size = $_FILES['uploadedfile']['size']; if(strlen($name)) { list($txt, $ext) = explode(".", $name); if(in_array($ext,$valid_formats)) { if($size<(100024*100024)) { $actual_image_name = $path.time().".mp4"; $tmp = $_FILES['uploadedfile']['tmp_name']; $upurl="http://vtube.subins.com/files/video?vid=".time(); $title=$_POST['vn']; mysql_query("INSERT INTO videos(title,user,url,vid,ext) VALUES ('$title', '$user','$upurl',NOW(),'$ext')"); echo '<br><h1>'.$_FILES['uploadedfile']['name'] . " uploaded.</h1>"; } else echo "<br><h1>Video file size max 100 MB"; } else echo "<br><h1>Invalid file format.."; } else echo "<br><h1>Please select a video..!"; exit; } } ?>

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  • Which DB should I use for my newbie program?

    - by knijo
    I'm really new to programming, and I need some advice. I'm currently working on a very simple program to maintain a list of users at a company, as well as their clock in and clock out info. I would like to make this application easy to distribute (on a cd probably), and I'm looking for advice on which database to use for storing my data. My application is implemented using java and swing. A friend recommended MySQL, but I don't want to go installing the db server on every computer the application is installed on. Another friend recommended Access. Any tips would be greatly appreciated

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  • Is Apple getting out of the general purpose development platform business?

    - by Charles E. Grant
    I've been doing general ANSI C/Console C++/Java/Web development on Mac hardware for about ten years. I make no claims of objective superiority over other platforms, it just satisfies my personal tastes. With the success of the iPhone and the related App store there was some speculation that Apple would get out of the general purpose computer market, and become a closed software ecosystem, focusing on consumer appliances. I pooh-poohed the speculation at the time, but this week Apple announced that a) they were opening an App store for the Mac, b) Java applications would not be eligible for the App store, c) the Apple JVM was being deprecated and might not be available for future releases of OS X. I'm not a Java developer per se, but I work in a research lab that occasionally writes Java applications, and also depends on tools written Java. This has the potential to be a huge pain in the butt for us. As of now, there is no other JVM for OS X that we can point our end users to. Soy Latte and OpenJDK might be appropriate for developers, but the complexity of the installation makes them inappropriate for end users. Eventually I expect Oracle/SUN will produce a replacement JVM for OS X. More worrisome to me is that Apple used to specifically advertise that it was an excellent platform for scientific development, because they supported all major language platforms. Is the deprecation of their JVM a sign that this market no longer interests them?

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  • how to call web method in java application?.

    - by user12344
    Hi, I have created java web application(Web Service). I want to call the setName() method in java application(GUI). how is call web method in application?. package sv; import javax.jws.WebMethod; import javax.jws.WebParam; import javax.jws.WebService; @WebService() public class MyService { @WebMethod(operationName = "setName") public String setName(@WebParam(name = "name") String name) { return "my string is "+ name; } }

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  • How can I deal with a difficult developer that is holding back the project? [migrated]

    - by ILovePaperTowels
    Our entire project is being held up because of one piece which is being handled by a single developer. When we did finally got the latest version of his code and started reviewing it, we found the code was horrendous! Its a relatively simply workflow, however the code is so complex that it's very difficult to step through and review/debug. The developer responsible has a hard time accepting any kind of criticism, and feels he is more knowledgeable than others members of the team. It's difficult to even talk to him about his development work because it turns into "I know what I'm talking about and you're just wrong!" type of conversation. A request has already been put in to replace this developer but management is not doing anything. This is probably because devs are in short supply where we are, and this is a corporation has a lot of office drama. I'm just one of the developers, not the project manager, however I really want to see this project succeed. What can I do in this sort of situation to try and keep the project on track?

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  • iTunes Connect: Can I have one bank account for every currency I receive?

    - by cheeesus
    As I understand it, Apple does not do currency exchanges when they pay the app developers, they just forward the 70% share in the currency the customers bought it. So, if an app is available in different markets, the developer receives payments in different currencies. Is there a way to enter one bank account for every currency? For example, I'd like to set up a bank account in EUR for payments in EUR, one in GBP for payments in GBP, and likewise for USD etc. If all payments are going to the same bank account, my bank charges high conversion rates every time a payment in a 'foreign' currency comes in.

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  • Intentionally breaking iPhone + Exchange communication [closed]

    - by Stafford Williams
    I've (accidently) found a way to construct an email that will cause an iPhone to be unable to download any emails from the Exchange folder this email is present in. The only way to fix this issue, is to go the account outside the phone (web/outlook) and delete the email. I've tested this against windows and android phones, and they are not affected. When trying to determine what was the cause of this issue I found several posts like this one offering possible resolutions, but they did not seem to be related to this specific issue (I also tried most of the solutions, including some from apple, but none of them fixed the issue) Should I report this issue and how its recreated to someone? If so, who/where?

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  • Is it OK to push my code to GitHub while it is still in early development?

    - by marco-fiset
    I have some projects that are in a very early development state. They are nowhere nearing completion but I do host them (as public repos) on GitHub because: I have multiple computers and I want access to my code everywhere I want a backup for my code I want it to be easy if someone wants to collaborate in some way I use GitHub Issues as a poor man's project management software Is it OK to publish a project on GitHub even when it is very early in the development? I am a bit concerned about someone to come by and say OMG this is total BS, this code is so bad! while looking at unpolished/still in development/not tested code. What are your practices when you start new public projects? Do you wait until you have something substantial to show or you create a bare repo directly on GitHub and start from there? I used GitHub throughout this post but this applies to every code hosting service out there.

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  • Facebook Java API

    - by Filippo
    I'd like to write a program in java (not a servlet, not jsp, not a webapp) which allows me to do simple things, such as connecting to a FB account and retrieve the status or posts on the wall. I know facebook no longer supports official JavaAPI, so I was wondering what are the best (and most simple, being the program very basic) unofficial api out there. If possible, i would also like some example-code. searching through the web, I've read that you need two secret keys to create a facebook application, and I have not a fb account. Is it indispensable to have an account? thank you everyone

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  • Considerations when designing a file type

    - by AndyBursh
    I'm about to start writing a process for saving some data structure from code in to a file of some proprietary, as-yet-undefined type. However, I've never designed a file type or structure before. Are there any things, generally speaking, that I should consider before starting my design? Are there any accepted good practices here? Bad practices I should avoid? Any absolute do's and don'ts? Can anybody recommend any good reading on this topic?

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  • What's a good open source cloud computing software? [closed]

    - by boy
    In particular, the "cloud" computing that I'm referring to is: I'm going to get some Linux servers. Then I have pretty big computing tasks to do every day. So my goal is to be able to run some shell command to request an "instance" (ie, if a server has 4 CPU, then the computing software will configure that server to have 4 instances, assuming all my tasks are single thread). Ideally, then I can run the following command: ./addjobs somebatchfile where somebatch file contains one command per line ./removejobs all ./listalljobs (ie, everything is done in shell. And the "computing software" can return me the hostname that's available in some environment variable, etc) And that's all I needed. I run into OpenStack.. but it seems too complicated for this purpose (ie, it does all the Imagine sharing stuff, etc).. All I want, is something SIMPLE that manages the Linux boxes for me and I'm just going to run shell commands on them... Is there such open source software? Thanks,

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  • Reformatting and version control

    - by l0b0
    Code formatting matters. Even indentation matters. And consistency is more important than minor improvements. But projects usually don't have a clear, complete, verifiable and enforced style guide from day 1, and major improvements may arrive any day. Maybe you find that SELECT id, name, address FROM persons JOIN addresses ON persons.id = addresses.person_id; could be better written as / is better written than SELECT persons.id, persons.name, addresses.address FROM persons JOIN addresses ON persons.id = addresses.person_id; while working on adding more columns to the query. Maybe this is the most complex of all four queries in your code, or a trivial query among thousands. No matter how difficult the transition, you decide it's worth it. But how do you track code changes across major formatting changes? You could just give up and say "this is the point where we start again", or you could reformat all queries in the entire repository history. If you're using a distributed version control system like Git you can revert to the first commit ever, and reformat your way from there to the current state. But it's a lot of work, and everyone else would have to pause work (or be prepared for the mother of all merges) while it's going on. Is there a better way to change history which gives the best of all results: Same style in all commits Minimal merge work ? To clarify, this is not about best practices when starting the project, but rather what should be done when a large refactoring has been deemed a Good Thing™ but you still want a traceable history? Never rewriting history is great if it's the only way to ensure that your versions always work the same, but what about the developer benefits of a clean rewrite? Especially if you have ways (tests, syntax definitions or an identical binary after compilation) to ensure that the rewritten version works exactly the same way as the original?

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  • Moving away from PHP and running towards server-side JavaScript [on hold]

    - by Sosukodo
    I've decided to start moving away from PHP and server-side JavaScript looks like an attractive replacement. However, I'm having a hard time wrapping my head around how others are using Node.js for web applications. I'm currently using Lighttpd with FastCGI PHP. The one thing I like about PHP is that I can "inline" my scripts in the document like so: <?php echo 'Hello, World!'; ?> My question is: Is there any server-side JavaScript solution that I can use in this manor? For instance, I'd love to be able to do this: <?js print('Hello, World!'); ?> Is there such a thing? I'm not looking for opinions about "which is better". I just want to know what's out there and I'll explore each of them on my own. The important thing is that I'd like to use it like I demonstrated above. Links to the software along with implementation examples will be considered above other answers.

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  • Java - Using Linear Coordinates to Check Against AI [closed]

    - by Oliver Jones
    I'm working on some artificial intelligence, and I want my AI not to run into given coordinates as these are references of a wall/boundary. To begin with, every time my AI hits a wall, it makes a reference to that position (x,y). When it hits the same wall three times, it uses linear check points to 'imagine' there is a wall going through these coordinates. I want to now prevent my AI from going into that wall again. To detect if my coordinates make a straight line, i use: private boolean collinear(double x1, double y1, double x2, double y2, double x3, double y3) { return (y1 - y2) * (x1 - x3) == (y1 - y3) * (x1 - x2); } This returns true is the given points are linear to one another. So my problems are: How do I determine whether my robot is approaching the wall from its current trajectory? Instead of Java 'imagining' theres a line from 1, to 3. But to 'imagine' a line all the way through these linear coordinantes, until infinity (or close). I have a feeling this is going to require some confusing trigonometry? (REPOST: http://stackoverflow.com/questions/13542592/java-using-linear-coordinates-to-check-against-ai)

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  • Career Shifters: How to compete with IT/ComSci graduates

    - by CareerShifter
    I am wondering what are the chances of a career shifter (mid 20's), who have maybe 3-6 months programming experience vs. younger fresh IT/Com Sci graduates. You see, even though I really love programming (Java/J2EE), but nobody gives me a feedback when I apply online. maybe because they preferred IT/ComSci graduates vs a career shifter like me.. So can you advice on how to improve my chance on being hired. How can i get a real-job programming experince if nobody is hiring me. I can make my own projects (working e-commerce site blah blah) but it is still different from the real job. And my codes are working but it still needs a lot of improvement and no one can tell me how to improve it because no one sees it (because I'm doing it alone?). Do you know any open source websites (java/j2ee/jee) / online home-based jobs who accepts java/j2ee/jee trainees.. Thank you very much

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  • I seem to be missing a few important concepts with PhoneGap

    - by garethdn
    I'm planning on developing an app on multiple platforms and I'm thinking that PhoneGap might be perfect for me. I had been reading that it's one codebase for all platforms but looking at the PhoneGap guide it seems there are separate instructions for each platform. So if i want to develop for iOS, Android, BB and WP7 I need to write 4 different sets of code? I'm sure i'm missing something fundamental here. Aside from that, how do people usually approach a PhoneGap build? You obviously / probably want the finished app to look like a native app - is it more common than not to use jQuery Mobile together with PhoneGap? Is there a preferred IDE? I see, in the guide, for iOS they seem to suggest Xcode. I'm fine using Xcode but it seems a bit overkill for HTML & CSS. Do I need to develop in Xcode and if not how do i approach it? Use a different IDE / Text Editor and then copy paste into Xcode for building and testing? I know this question is long-winded and fundamental but it something which i don't think is properly addressed in the guides. Thanks.

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  • Dealing with FUD? [on hold]

    - by Pawel G.
    How to interact with colleague who will happily talk about a thing, but from the way he talk about it, it becomes clear, that he does not fully understand some underlying concepts - but at the same time is not that kind of personality, that would ask for clarification or explanation (maybe because it is sign of weakness). There is difficulty involved in such a situation, since such people will demand to be consulted in a decision process, but instead of brainstorming solutions one will need to neutralize the diffusion of the concepts first, and when this is done time is already up and solution cannot be brainstormed any more. Maybe FUD is not the correct acronym, maybe DIS, Diffusion, Indifference, Surety.

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  • Traverse tree with results. Maybe type in Java?

    - by Angelo.Hannes
    I need to check a tree's node state. It can either be OK or NOT_OK. But that state is dependent on its children. So for a node to be OK, every of its children needs to be OK. If one or more of its children is NOT_OK the whole node is NOT_OK. To determine the state of a node I need to aggregate some properties of the node. So I thought of two possible implementations. And they are more or less covered in this question: Why is Option/Maybe considered a good idea and checked exceptions are not? Exception I could pass the properties up the recursion path, and throw an exception if something went wrong. Maybe I implement an Maybe type and let it either hold an error or the aggregated properties. Maybe it is more an Either. I tend towards the last option. And I'm thinking of an enum with two objects. Where I can additionally set those aggregated properties. Am I on the right track? I'm not familiar with the new JDK8 functional stuff. But I'm stuck on JDK7 anyway, so please focus on JDK7.

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  • Patterns for a tree of persistent data with multiple storage options?

    - by Robin Winslow
    I have a real-world problem which I'll try to abstract into an illustrative example. So imagine I have data objects in a tree, where parent objects can access children, and children can access parents: // Interfaces interface IParent<TChild> { List<TChild> Children; } interface IChild<TParent> { TParent Parent; } // Classes class Top : IParent<Middle> {} class Middle : IParent<Bottom>, IChild<Top> {} class Bottom : IChild<Middle> {} // Usage var top = new Top(); var middles = top.Children; // List<Middle> foreach (var middle in middles) { var bottoms = middle.Children; // List<Bottom> foreach (var bottom in bottoms) { var middle = bottom.Parent; // Access the parent var top = middle.Parent; // Access the grandparent } } All three data objects have properties that are persisted in two data stores (e.g. a database and a web service), and they need to reflect and synchronise with the stores. Some objects only request from the web service, some only write to it. Data Mapper My favourite pattern for data access is Data Mapper, because it completely separates the data objects themselves from the communication with the data store: class TopMapper { public Top FetchById(int id) { var top = new Top(DataStore.TopDataById(id)); top.Children = MiddleMapper.FetchForTop(Top); return Top; } } class MiddleMapper { public Middle FetchById(int id) { var middle = new Middle(DataStore.MiddleDataById(id)); middle.Parent = TopMapper.FetchForMiddle(middle); middle.Children = BottomMapper.FetchForMiddle(bottom); return middle; } } This way I can have one mapper per data store, and build the object from the mapper I want, and then save it back using the mapper I want. There is a circular reference here, but I guess that's not a problem because most languages can just store memory references to the objects, so there won't actually be infinite data. The problem with this is that every time I want to construct a new Top, Middle or Bottom, it needs to build the entire object tree within that object's Parent or Children property, with all the data store requests and memory usage that that entails. And in real life my tree is much bigger than the one represented here, so that's a problem. Requests in the object In this the objects request their Parents and Children themselves: class Middle { private List<Bottom> _children = null; // cache public List<Bottom> Children { get { _children = _children ?? BottomMapper.FetchForMiddle(this); return _children; } set { BottomMapper.UpdateForMiddle(this, value); _children = value; } } } I think this is an example of the repository pattern. Is that correct? This solution seems neat - the data only gets requested from the data store when you need it, and thereafter it's stored in the object if you want to request it again, avoiding a further request. However, I have two different data sources. There's a database, but there's also a web service, and I need to be able to create an object from the web service and save it back to the database and then request it again from the database and update the web service. This also makes me uneasy because the data objects themselves are no longer ignorant of the data source. We've introduced a new dependency, not to mention a circular dependency, making it harder to test. And the objects now mask their communication with the database. Other solutions Are there any other solutions which could take care of the multiple stores problem but also mean that I don't need to build / request all the data every time?

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  • Entry level developer career advice [closed]

    - by Evan
    I just got done with college and I have a full time job with a large software company that I have been an intern at for over a year. As an intern I was on the web team doing lots of architecture and developing UI in ExtJS and some Java backend experience. Now as a full time employee I am mainly doing ExtJS applications, which I enjoy a lot, and I want to stay in the web development field, but: Am I limiting my career options with just doing ExtJS stuff? Will experience in ExtJS help or hinder my programming skills? Will I be looked down upon because I'm only gaining experienced with ExtJS?

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  • How to become an expert in Python, PHP and Javascript? [closed]

    - by Andrew Alexander
    So I've been programming for about 9ish months now, and I've taught myself some Python, some PHP and some Javascript. I want to become better at these languages - I can hack something out, but a lot of things like OOP, using lists in the most effective ways, etc, is lost on me. What are the best ways to become an "expert" programmer? Does it depend on the nuances of the language, or is it more general? Is there any math I should be studying alongside it? Obviously a lot depends on what you want to do with it - so far I've mostly done small scale internal applications as well as web programming. How do I find out about good program design?

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