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  • Memory management in Qt?

    - by Martin
    I'm quite new to Qt and am wondering on some basic stuff with memory management and the life of objects. When do I need to delete / destroy my objects? Is any of this handled automatically? In the example below, which of the objects I create do I need to delete? What happens to the instance variable myOtherClass when myClass is destroyed? What happens if I don't delete / destroy my objects at all, will that be a problem to memory? in MyClass.h: class MyClass { public: MyClass(); ~MyClass(); MyOtherClass *myOtherClass; }; in MyClass.cpp: MyClass::MyClass() { myOtherClass = new MyOtherClass(); MyOtherClass myOtherClass2; QString myString = "Hello"; } As you can see this is quite newbie-easy stuff but where can I learn about this in an easy way? Thanks really much

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  • Looking for design/architecture suggestions for a simple HTML game.

    - by z-boss
    Imagine that HTML page is a game surface (see picture). User can have n number of boards (blue divs) on his page. Each board can be moved, re-sized, relabeled, created new and removed. Inside each board there are m number of figures (purple divs). Each of these user can move inside the board or to another board, re-size, change color and label, delete, add new. The goal of the game is not important, but let's say it is to rearrange figures in a certain way so that they disappear. But the goal of the programmer is to save the whole game surface in the database for every user of the site, and to load it later when he returns. So, how do I go about data exchange between client and the database? I'll give my idea in one of the answers.

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  • How to request device token on iphone

    - by Greg
    Hello, I am able to use the didRegisterForRemoteNotificationWithDeviceToken callback method to get the device token of my iphone when subscribing to push notifications. My question is how can I get this token again a later time? When a user subscribes to something in my application, I want to send the device token and the id of the item they are subscribing to...but I can't figure out where to get the device token from. I tried using the uniqueIdentifer from the UIDevice class but this value is different than what the original token was. I supposed I could call registerForRemoteNotificationTypes each time my app starts to produce the token. But if I do that, I'm not sure how I can access this value from a different class (my didRegisterForRemoteNotificationWithDeviceToken callback is located in the main application delegate). Thanks for any help for an objective C newbie!

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  • Blackberry Widget vs Java SDK

    - by rithanyalaxmi
    Hi, I am a newbie to this forum,I was going through the documents of both Blackberry Widget and Java SDK. I have the following doubts to get clarified:- 1) Advantages and disadvantages of Java SDK and Widget SDK? 2) When to go for Java SDK and Widget SDK? 3) Both Java and Widget applications require the latest blackberry OS 5.0? OR whether they are compatible with the lower versions as well? 4) Whatever developed with Java SDK can be done with widget SDK? similarly the vice-versa? 5) Is it possible to create the .java classes for Widget application development? 6) Whether all the blackberry models supports both Java and Widget ? 7) What are the Databases the blackberry Java and Widget supports? Please do shed some light into this as i was unable to find a suitable documentation on these. Thanks, Rithu

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  • How to structure an enterprise MVC app, and where does Business Logic go?

    - by James
    I am an MVC newbie. As far as I can tell: Controller: deals with routing requests View: deals with presentation of data Model: looks a whole lot like a Data Access layer Where does the Business Logic go? Take a large enterprise application with: Several different sources of data (WCF, WebServices and ADO) tied together in a data access layer (useing multiple different DTOs). A lot business logic segmented over several dlls. What is an appropriate way for an MVC web application to sit on top of this (in terms of code and project structure)? The example I have seen where everything just goes in the Model folder don't seem like they are appropriate for very large applications. Thanks for any advice!

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  • sending mail using mutt + emacs

    - by lakshmipathi
    How to sent mail from emacs? I have add from address and subject and trapped inside emacs I found this There are two ways to send the message. C-c C-s (mail-send) sends the message and marks the mail buffer unmodified, but leaves that buffer selected so that you can modify the message (perhaps with new recipients) and send it again. C-c C-c (mail-send-and-exit) sends and then deletes the window or switches to another buffer But both ( ctrl+c ctrl+s ) and (ctrl-c crtl+c) are not working ps:Thought it's not programming related. it's programmer environment related question-hoping it won't be closed :)

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  • iPhone development time...

    - by Tisch
    I have been asked to develop a relatively simple iPhone application. However, it would be my first application. I am a fairly competent programmer and can turn my skills to a new language fairly quickly... what my question is, is... How long has it taken some of you guys to make your first iPhone application and what was your experience like? Also, if you can say this sort of information, how much did you charge for it?! Thanks in advance. Kindest Regards Tom

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  • How to get the quickfix timestamp?

    - by yves Baumes
    I've seen in quickfix doxygen documentation that it generates an utc timestamp as soon as it has received a FIX message from a socket file. Have a look in ThreadedSocketConnection::processStream(), it calls then m_pSession->next( msg, UtcTimeStamp() ); I would like to get that timestamp, because I need it to screen network and QuickFix lib latencies. I didn't find a way to get it from FixApplication::fromApp() callback or 'Log::onIncoming()' callback. As I am newbie with quickfix I would like to know if I missed something in the Quickfix documentation. Did anybody ever done that before? Of course there is other solutions, but for homogeneity with others market acces applications I maintain, I would prefer to avoid them. For instance, I would prefer not to modify QuickFix code source. And I would like to avoid re-write the application logic that quickfix provide me, quickfix helpping me only for message decoding.

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  • Charging for the creation of a website [closed]

    - by mattgcon
    I am not sure if this can be asked here, but you all are very reliable and trustworthy in my eyes and well straight to the point, so I am going to ask. I am a professional programmer and web designer for UCLA (do not set prices) and I have an old colleage that needs a website designed for his new company. He wants his website to resemble the LDH Energy website, layout colors and the flash movies (no image replication or verbiage, all that will be his) and he has one idea of a price and I have another. Can anyone go and look at that website and let me know their opinion of what to charge for his website? thank you matthew

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  • Iterating anchors in jquery doesn't seem to work...

    - by bala3569
    Hai i am generating page numbers based on currentpage and lastpage using jquery ... Here is my function and as i am newbie i dont know how it can be done... function generatePages(currentPage, LastPage) { if (LastPage <= 5) { var pages = ''; for(var i=1;i<=5;i++) { pages += "<a class='page-numbers' href='#'>" + i + "</a>" } $("#PagerDiv").append(pages); } if (LastPage > 5) { var pages = ''; for (var i = 1; i <= 5; i++) { pages += "<a class='page-numbers' href='#'>" + i + "</a>" } $("#PagerDiv").append(pages); } } I want the result to be like this If it is the first page If it is in the middle, If it is the last page, I have the lastPage and currentPage values please help me out getting this...

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  • Mouse configurable buttons for programming

    - by DavRob60
    Different mouse models has been already discussed. But all these mouse got configurable buttons. Has a programmer, how do you set them? I use The Microsoft Intellimouse Optical. So set the Left side button to "Copy" and the Right side button to "Paste". I did not set the Wheel click to anything. I'm curious to see if there is any better setup? UPDATE : I'm trying to find some interesting key I could map to my mouse buttons. Copy & paste are the best I' found so far, but i just want to know if there is something that could be more useful when programming.

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  • Why use Oracle Application Express for web app?

    - by Jack
    Hi all. I believe we're moving to Oracle Apex for future development. I've read about Oracle Apex on wikipedia and it's pro and con. It seem to me the con outweigh the pro but maybe I'm wrong. I get the sense that Oracle Apex is for DBA with little or no programing knowledge to setup a web app quickly sort like MS Access for none programmer. If you have Oracle Apex working experience, can you share your though? From wikipedia's entry, it doesn't seem like you need to know any programming language at all but just the PL/SQL? edit: Is Oracle Apex scalable? Can it handle traffic like Facebook's size? Thank. Jack

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  • c# resize window over display resolution

    - by Sebastian
    I am total newbie in .Net programming so be patient, please ;-). I have problem with resizing window. I want to resize from my app other app's window and take screenshot of it. I do resizing based on this example: http://blogs.geekdojo.net/richard/archive/2003/09/24/181.aspx. But I have a problem. I work on a laptop with 1024x640 pixels screen resolution but I want to resize my window to 1200x1600 px. I can't do that couse display limitations. Is there any tricky solution to resize window for this resolution and take a screenshot of whole window? I've alos tried Sdesk program witch is suggested here: http://stackoverflow.com/questions/445893/create-window-larger-than-desktop-display-resolution. Any help?

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  • Initialization of std::vector<unsigned int> with a list of consecutive unsigned integers

    - by Thomas
    I want to use a special method to initialize a std::vector<unsigned int> which is described in a C++ book I use as a reference (the German book 'Der C++ Programmer' by Ulrich Breymann, in case that matters). In that book is a section on sequence types of the STL, referring in particular to list, vector and deque. In this section he writes that there are two special constructors of such sequence types, namely, if Xrefers to such a type, X(n, t) // creates a sequence with n copies of t X(i, j) // creates a sequence from the elements of the interval [i, j) I want to use the second one for an interval of unsigned int, that is std::vector<unsigned int> l(1U, 10U); to get a list initialized with {1,2,...,9}. What I get, however, is a vector with one unsigned int with value 10 :-| Does the second variant exist, and if yes, how do I force that it is called?

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  • Does the traditional use of the controller in MVC lead to a violation of the Single Responsibility P

    - by Byron Sommardahl
    Wikipedia describes the Single Responsibility Principle this way: The Single Responsibility Principle states that every object should have a single responsibility, and that responsibility should be entirely encapsulated by the class. All its services should be narrowly aligned with that responsibility. The traditional use of the controller in MVC seems to lead a programmer towards a violation of this principle. Take a simple guest book controller and view. The controller might have two methods/actions: 1) Index() and 2) Submit(). The Index() displays the form. The Submit() processes it. Do these two methods represent two distinct responsibilities? If so, how does Single Responsibility come in to play?

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  • Convert XCode view-based app to navigation-based app?

    - by Wally
    Newbie question: is there an easy way to convert a view-based app to a navigation-based app? I have an existing app sample that was created as a view-based app, and need to be able to create additional viewcontrollers that can be nested. The app is currently using presentModalViewController calls and nibs to display windows. Trying to change these to pushViewController calls results in the views not being displayed. So I'm assuming it's because the pushViewController needs to use a Navigation view. Thanks in advance!

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  • What is the purpose of return'ing $this when setting vars in the model

    - by TaMeR
    I am a self thought hobby programmer and therefore don't have the fundamentals always down the way you professionals do. So please excuse me if this is basic. What is the purpose or benefit of return'ing $this when setting vars in the model. I have seen this done in other places too but cant figure this out. Sample code: public function setAlias($Alias){ $this->_Alias = (string) $Alias; return $this; } public function getAlias(){ return $this->_Alias; }

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  • Access variables from a number of sources

    - by mac_55
    I'm creating my first game, and I've currently set up a 'GameState' class, to store player health etc. inside. This class is currently instantiated from the AppDelegate as I need to access it from all over my game. This is fine. For each class I'm working in, I can access the app delegate, and then find the GameState object... however, it seems very messy. I'm tempted to find a way (I'm still a newbie) to define the GameState instance as being some sort of global variable so that I can access it from all over with ease... but my little bit of reading on variable scope makes me uneasy about doing this, even if I knew how. Any ideas of the best way to define and access this class? It'll be used for everything from player health, to items they've found, any personalisation etc. Thanks!

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  • Matrix multiplication in java (RE-POST)

    - by Chapax
    Apologies for the re-post; the earlier time I'd posted I did not have all the details. My colleague, who quit the firm was a C# programmer, was forced to write Java code that involved (large, dense) matrix multiplication. He's coded his own DataTable class in Java, in order to be able to a) create indexes to sort and join with other DataTables b) do matrix multiplication. The code in its current form is NOT maintainable/extensible. I want to clean up the code, and thought using something like R within Java will help me focus on business logic rather than sorting, joining, matrix multiplication, etc. Plus, I'm very new to the concept of DataTable; I just want to replace the DataTable with 2D arrays, and let R handle the rest. (I currently do not know how to join 2 large datasets in java very efficiently Please let me know what you think. Also, are there any simple examples that I can take a look at?

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  • (fluxus) learning curve

    - by Inaimathi
    I'm trying to have some fun with fluxus, but its manual and online docs all seem to assume that the reader is already an expert network programmer who's never heard of Scheme before. Consequently, you get passages that try to explain the very basics of prefix notation, but assume that you know how to pipe sound-card data into the program, or setup and connect to an OSC process. Is there any tutorial out there that goes the opposite way? IE, assumes that you already have a handle on the Lisp/Scheme thing, but need some pointers before you can properly set up sound sources or an OSC server? Barring that, does anyone know how to get (for example) the system microphone to connect to (fluxus), or how to get it to play a sound file from disk?

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  • Making .net navigation menu role specific

    - by Ricardo Deano
    Hello all. I'm currently using the good ol login control, .net membership & role providers for a web app I'm building. I have a tabbed navigation menu that I want to make role specific i.e. everyones sees 'Home', one role would be able to see additional tabs, another would be able to see three, etc. Doe sthe allow for such a thing? Has anyone created such a navigation menu and could point a newbie in the right direction? Any help gratefully received.

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  • Smartest way to draw 100+ images on screen

    - by Henrik
    Hello all, First of all I'm a newbie when it comes to Android programming. So if this question is totally stupid please delete it ASAP :-). Question: I'm going to draw a grid of 10x10 PNG images. Each image is 32x32 px. All of the images are unique. I'm thinking that the easiest way seems to be to put each image in an ImageView. If adding all ImageView's to the layout would this give me some kind of performance hit? Would there be any smarter way to draw these images? Thanks. / Henrik

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  • IPC speed and compare

    - by Lily
    I am trying to implement a real-time application which involves IPC across different modules. The modules are doing some data intensive processing. I am using message queue as the backbone(Activemq) for IPC in the prototype, which is easy(considering I am a totally IPC newbie), but it's very very slow. Here is my situation: I have isolated the IPC part so that I could change it other ways in future. I have 3 weeks to implement another faster version. ;-( IPC should be fast, but also comparatively easy to pick up I have been looking into different IPC approaches: socket, pipe, shared memory. However, I have no experience in IPC, and there is definitely no way I could fail this demo in 3 weeks... Which IPC will be the safe way to start with? Thanks. Lily

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  • How do I use a shared library (in this case JsonCpp) in my C++ program on Linux?

    - by Not Joe Bloggs
    I'm a new-ish C++ programmer, and I'm doing my first program on my own using C++. I decided I would like to use JSON to store some of the data I'm going to be using, and I've found a library to handle JSON, JsonCpp. I've installed the library using my Linux system's package manager, and in my C++ code, I've used in my source code file #include <json> and compiled it using g++ and it's -ljson and -L/usr/lib options (libjson.so is located in /usr/lib). However, the first usage of Json::Value, an object provided by the library, gives a compilation error of "Json has not declared". I'm sure my mistake is something simple, so could someone explain what I'm doing wrong? None of the books I had mention how to use shared libraries, so I've had to google to find this much.

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  • Cure for puzzle piece programming habits?

    - by Recursion
    Even though I went to a decent CS school, I was still taught with the mentality of programming with puzzle pieces. By puzzle pieces I mean, looking up code segments at each step of the development process and adding them together as needed. Eventually gathering all of the pieces and having a properly working program. So as an example, if in my program the next step is to tokenize a string, I go to google and search "how do I tokenize a string in language". All instead of critically thinking about its implementation. I personally don't think its a very good way to program and I always seem to forget everything that I have searched for. So how can I get out of this puzzle piece mode of programmer that I was taught.

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