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  • Proper use of Q_OBJECT?

    - by Jen
    If I derive my class from QObject (or a subclass), the Qt documentation says that I have to put the Q_OBJECT macro into my class declaration. It also ways I need to "run the meta-object compiler" for my class. I have no idea how to do this. Is this something I need to add to the .pro file? Do I need to edit the makefile? This seems overly complicated for a simple derived class. I'm using Qt Creator.

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  • POX return data from WCF Data Services

    - by keithwarren7
    I am using WCF Data Services (netfx4) to provide data sourced from SQL via EF, the standard OData mechanism is fine and JSON works as well but I need a third option for generic POX (plain old xml). I have yet to come across a simple strategy or switch that allows me to control this but I am sure one must exist or a workaround method might be available. Any ideas? Ideally I would like to be able to use something like the JSONP option wherein I append 'format=JSON' to the URL, in this case 'format=pox' or 'POX=true' or something of that nature.

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  • How can I do a fastAgi to use with Asterisk in Perl

    - by Edwin Jaws
    Hi! I am trying to do an IVR using FAstAGI to say information from my database to my clients. I done AGI doing this but I need now run this from another server, windows server, but I dont know how can I do this. I checked the Asterisk::fastagi module but it is so confused and I dont understand anything. I did a few AGI perl scripts without problem but now I get. If somebody can give me an example to simple script to put me on rigth direction to do that will be so appreciated. Just I need one exmaple and to know if all AGI normal commands from AGI like stream_file are available in fastagi Thks In Advance Edwin Jaws

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  • Counting number of children in hierarchical SQL data

    - by moontear
    Hello, for a simple data structure such as so: ID parentID Text Price 1 Root 2 1 Flowers 3 1 Electro 4 2 Rose 10 5 2 Violet 5 6 4 Red Rose 12 7 3 Television 100 8 3 Radio 70 9 8 Webradio 90 For reference, the hierarchy tree looks like this: ID Text Price 1 Root |2 Flowers |-4 Rose 10 | |-6 Red Rose 12 |-5 Violet 5 |3 Electro |-7 Television 100 |-8 Radio 70 |-9 Webradio 90 I'd like to count the number of children per level. So I would get a new column "NoOfChildren" like so: ID parentID Text Price NoOfChildren 1 Root 8 2 1 Flowers 3 3 1 Electro 3 4 2 Rose 10 1 5 2 Violet 5 0 6 4 Red Rose 12 0 7 3 Television 100 0 8 3 Radio 70 1 9 8 Webradio 90 0 I read a few things about hierarchical data, but I somehow get stuck on the multiple inner joins on the parentIDs. Maybe someone could help me out here. moon

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  • How to decode Google spreadsheet's Json respose as a Php Array

    - by Mohammad
    My google Docs Spreadsheet call returns this response in the json format (I only need everything after "rows") please look at the formatted response here : ) I use php's json_decode function to parse the data and use it (Yes, I am awful at php) This code returns NULL, and according to the documentation, NULL is returned "if the json cannot be decoded". $json = file_get_contents($jsonurl); $json_output = json_decode($json); var_dump ($json_output); // Returns NULL Basically, what i want to accomplish is to make a simple array from the first row values of the Json response. like this $array = {'john','John Handcock','[email protected]','2929292','blanc'} You guys are genius, I would appreciate your insight and help on this very much! Answer as "sberry2A" mentions bellow, the response is not valid Json, google offers the Zend Json library for this purpose, tho I decided to parse the tsv-excel version instead :)

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  • Using a member function with QScriptEngine::newFunction

    - by Rohan Prabhu
    Hey all, Let's take the case of a simple class: QScriptEngine engine; class MyClass { public: QScriptValue foo(QScriptContext*, QScriptEngine*); MyClass(); }; QScriptValue MyClass:foo(QScriptContext* context, QScriptEngine* eng) { //something } MyClass::MyClass() { QScriptValue self = engine.newFunction(this->foo, 0); .... } The above function gives me an error: no matching function for call to ‘QScriptEngine::newFunction(<unresolved overloaded function type>, int)’ I have tried using engine.newFunction(reinterpret_cast<FunctionSignature>(foo), 0); but this gives me an error which basically says that the compiler is not aware of a keyword called 'FunctionSignature'. Any help is appreciated. Thanks a lot. Regards, rohan

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  • Pass a variable to a Symfony Form

    - by Juan Besa
    Hi, I am building a web application using Symfony 1.4 and Doctrine for a school and I want to make a very simple form to add a course to a student. The main problem I have is that in the drop down list I only want to show the courses in which the student is currently not enrolled. I already have a function in the model (in Student.class.php) which returns all the courses in which the student is not enrolled but the problem is I don't know how to pass the student to the configure() of the form. I have tried several options like passing it with the constructor of the form to a global variable or a special set method but none of them have worked. Is there any form to pass the student to the configure() method? Thanks!

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  • Is there a J2SE sensor API?

    - by Martin Strandbygaard
    Does anyone know of a "standardized" Java API for working with sensors, and which is closely tied to J2ME as is the case with JSR 256? I'm writing a Java library for interfacing with a sensor network consisting of several different types of sensors (mostly simple stuff such as temperature, humidity, GPS, etc.). So far I've rolled my own interface, and users have to write apps against this. I would like to change this approach and implement a "standard" API so that implementations aren't that closely tied to my library. I've looked at JSR 256, but that really isn't a great solution as it's for J2ME, and my library is mostly used by Android devices or laptops running the full J2SE.

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  • How can I programmatically obtain the company info used to digitally sign an assembly in .NET?

    - by chaiguy
    As a means of simple security, I was previously checking the digital signature of a downloaded update package for my program against its public key to ensure that it originated from me. However, as I'm using cheap code signing certs (Tucows), I am unable to renew an existing cert and therefore the keys change every time I need to renew. Therefore, a more reliable means would be to verify the organization information embedded in the signed assembly (which is displayed in the UAC dialog) against my well-known organization string, as this will continue to be the same. Does anyone know how to obtain this information from a digitally-signed assembly?

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  • HTML is not being interpreted after JQuery's .ajax function

    - by Casidiablo
    Hello there... Once I have retrived an HTML string with the $.ajax function I put it into a div... the HTML is a simple message with a <b> tag, but it's not being interpreted by the browser, I mean, the <b> is not making the text bold. Here is what I do: $.ajax({ url: 'index.php?ajax=ejecutar_configuracion&id_gadget=cubrimientos', cache: false, success: function(html){ // html = '<b>hello</b> newton' $('#config_reporte').html(html).dialog({ height: 300, width: 500, modal: true }); } }); As you can see, I'm writing the content of the HTML result into a modal dialog window. Does anybody know why is this happening? This should be something easy to do... but I haven't been able to make it work properly. Thank you so much.

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  • php gd image quality

    - by apueee
    I 'm trying to add text on a specific image. Its working perfectly but the quality of image is low especially for papyrus.ttf font. How can i improve the quality of text in the image. But i need high quality to print the output. Here is my code.. its very simple. header("Content-Type: image/jpeg"); $im = imagecreatefromjpeg("cosmos.jpg"); $black = ImageColorAllocate($im, 0, 0, 0); Imagettftext($im, 14, 0, 10, 15, $black, 'papyrus.ttf', "Corey and Lisa "); Imagettftext($im, 14, 0, 10, 35, $black, 'papyrus.ttf', " 1994, june"); Imagejpeg($im, '', 100); ImageDestroy($im); Download: http://wneeds.com/gdtest.zip

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  • Stack / base pointers in assembly

    - by flyingcrab
    I know this topic has been covered ad-naseum here, and other places on the internet - but hopefully the question is a simple one as I try to get my head around assembly... So if i understand correctly the ebp (base pointer) will point to the top of the stack, and the esp (stack pointer) will point to the bottom -- since the stack grows downward. esp therefore points to the 'current location'. So on a function call, once you've saved the ebp on the stack you insert a new stack frame - for the function. So in the case of the image below, if you started from N-3 you would go to N-2 with a function call. But when you are at N-2 - is your ebp == 25 and the esp == 24 (at least initially, before any data is placed on the stack)? Is this correct or am I of on a tangent here? Thanks!

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  • I never really understood: what is CGI?

    - by claws
    CGI is a Comman Gateway Interface. As the name says, it is a "common" gateway interface for everything. It is so trivial and naive from the name. I feel that I understood this and I felt this every time I encountered this word. But frankly, I didn't. I'm still confused. I am a PHP programmer. I did lot of web development. user (client) request for page --- webserver(-embedded PHP interpreter) ---- Server side(PHP) Script --- MySQL Server. Now say my PHP Script can fetch results from MySQL Server && MATLAB Server && Some other server. So, now PHP Script is the CGI? because its interface for the between webserver & All other servers? I don't know. Sometimes they call CGI, a technology & othertimes they call CGI a program or someother server. What exactly is CGI? Whats the big deal with /cgi-bin/*.cgi? Whats up with this? I don't know what is this cgi-bin directory on the server for. I don't know why they have *.cgi extensions. Why does Perl always comes in the way. CGI & Perl (language). I also don't know whats up with these two. Almost all the time I keep hearing these two in combination "CGI & Perl". This book is another great example CGI Programming with Perl Why not "CGI Programming with PHP/JSP/ASP". I never saw such things. CGI Programming in C this confuses me a lot. in C?? Seriously?? I don't know what to say. I"m just confused. "in C"?? This changes everything. Program needs to be compiled and executed. This entirely changes my view of web programming. When do I compile? How does the program gets executed (because it will be a machine code, so it must execute as a independent process). How does it communicate with the web server? IPC? and interfacing with all the servers (in my example MATLAB & MySQL) using socket programming? I'm lost!! They say that CGI is depreciated. Its no more in use. Is it so? What is its latest update? Once, I ran into a situation where I had to give HTTP PUT request access to web server (Apache HTTPD). Its a long back. So, as far as I remember this is what I did: Edited the configuration file of Apache HTTPD to tell webserver to pass all HTTP PUT requests to some put.php ( I had to write this PHP script) Implement put.php to handle the request (save the file to the location mentioned) People said that I wrote a CGI Script. Seriously, I didn't have clue what they were talking about. Did I really write CGI Script? I hope you understood what my confusion is. (Because I myself don't know where I'm confused). I request you guys to keep your answer as simple as possible. I really can't understand any fancy technical terminology. At least not in this case. EDIT: I found this amazing tutorial "CGI Programming Is Simple!" - CGI Tutorial Which explains the concepts in simplest possible way. I've only have one complaint about this tutorial. Just to make what ever he explained complete he should have shown the C code he used for generating response for those GET / POST requests. I've also added link to this tutorial to Wikipedia's article : http://en.wikipedia.org/wiki/Common_Gateway_Interface

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  • Android: howto parse URL String with spaces to URI object?

    - by Mannaz
    I have a string representing an URL containing spaces and want to convert it to an URI object. If is simple try to do String myString = "http://myhost.com/media/mp3s/9/Agenda of swine - 13. Persecution Ascension_ leave nothing standing.mp3"; URI myUri = new URI(myString); it gives me java.net.URISyntaxException: Illegal character in path at index X where index X is the position of the first space in the URL string. How can i parse myStringinto a URI object?

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  • Generating scriptaculous ajax.autocompleter on the fly

    - by user279992
    I have a form where the user can dynamically add a new table row with fields. I'm using a simple insertCell/InsertRow with innerHTML to generate the new row. One of those form fields is using scriptaculous' ajax.autocompleter. I have it generating new IDs for all the elements, but it is still not working The new row generated by js has the same source as the initial row of the form that loads at run time, however it does not appear to be calling the autocomplete function. I think my problem lies in that I don't understand when/how the "new Ajax.Autocompleter" is called. Is it not possible to use ajax.autocompleter like this? TIA

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  • Adjusting sql statement in a function based upon input

    - by Stefan
    Hey there, This is a bit urgent! I'm trying to make a simple filter search where-by you can choose from a series of 3 drop downs and then based upon this the results are then displayed, How would I go about adjusting the sql query for each and if you were to only choose to search from aone of the 3 rather than all 3 etc... example there could be the url with input such as: url.com?location=gb&color=3&hair=4 and still form the correct sql query for something like this: url.com?location=gb&hair=1 and not encounter problems with WHERE and AND etc etc and empty variables in the statement Would this not need to be a massive function to check using if to see how the data is set for all possibilities? Thanks, Stefan

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  • How to Package and Deploy Eclipse Java Application

    - by Rick
    Before I begin, I'm new to eclipse, please keep that in mind when replying. :) Here is the situation, I have built an java application that has some dependencies (~10 of them). I would like to easily package this application up and deploy it as a single file to a CD or usb drive. My question is there doesn't seem to be any "nice" wizard to search the project, grab the dependencies and setup the classpath on the target computer. Seems to me I have to do this manually. Is there a better way. Something simple, easy and straight forward. A link to a tutorial on this would be great. Seems to me that this should be a built-in feature to eclipse. Deployment of a web application seems easy enough, but not a java application. Thanks!

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  • Techniques for modeling a dynamic dataflow with Java concurrency API

    - by Maian
    Is there an elegant way to model a dynamic dataflow in Java? By dataflow, I mean there are various types of tasks, and these tasks can be "connected" arbitrarily, such that when a task finishes, successor tasks are executed in parallel using the finished tasks output as input, or when multiple tasks finish, their output is aggregated in a successor task (see flow-based programming). By dynamic, I mean that the type and number of successors tasks when a task finishes depends on the output of that finished task, so for example, task A may spawn task B if it has a certain output, but may spawn task C if has a different output. Another way of putting it is that each task (or set of tasks) is responsible for determining what the next tasks are. Sample dataflow for rendering a webpage: I have as task types: file downloader, HTML/CSS renderer, HTML parser/DOM builder, image renderer, JavaScript parser, JavaScript interpreter. File downloader task for HTML file HTML parser/DOM builder task File downloader task for each embedded file/link If image, image renderer If external JavaScript, JavaScript parser JavaScript interpreter Otherwise, just store in some var/field in HTML parser task JavaScript parser for each embedded script JavaScript interpreter Wait for above tasks to finish, then HTML/CSS renderer (obviously not optimal or perfectly correct, but this is simple) I'm not saying the solution needs to be some comprehensive framework (in fact, the closer to the JDK API, the better), and I absolutely don't want something as heavyweight is say Spring Web Flow or some declarative markup or other DSL. To be more specific, I'm trying to think of a good way to model this in Java with Callables, Executors, ExecutorCompletionServices, and perhaps various synchronizer classes (like Semaphore or CountDownLatch). There are a couple use cases and requirements: Don't make any assumptions on what executor(s) the tasks will run on. In fact, to simplify, just assume there's only one executor. It can be a fixed thread pool executor, so a naive implementation can result in deadlocks (e.g. imagine a task that submits another task and then blocks until that subtask is finished, and now imagine several of these tasks using up all the threads). To simplify, assume that the data is not streamed between tasks (task output-succeeding task input) - the finishing task and succeeding task won't exist together, so the input data to the succeeding task will not be changed by the preceeding task (since it's already done). There are only a couple operations that the dataflow "engine" should be able to handle: A mechanism where a task can queue more tasks A mechanism whereby a successor task is not queued until all the required input tasks are finished A mechanism whereby the main thread (or other threads not managed by the executor) blocks until the flow is finished A mechanism whereby the main thread (or other threads not managed by the executor) blocks until certain tasks have finished Since the dataflow is dynamic (depends on input/state of the task), the activation of these mechanisms should occur within the task code, e.g. the code in a Callable is itself responsible for queueing more Callables. The dataflow "internals" should not be exposed to the tasks (Callables) themselves - only the operations listed above should be available to the task. Note that the type of the data is not necessarily the same for all tasks, e.g. a file download task may accept a File as input but will output a String. If a task throws an uncaught exception (indicating some fatal error requiring all dataflow processing to stop), it must propagate up to the thread that initiated the dataflow as quickly as possible and cancel all tasks (or something fancier like a fatal error handler). Tasks should be launched as soon as possible. This along with the previous requirement should preclude simple Future polling + Thread.sleep(). As a bonus, I would like to dataflow engine itself to perform some action (like logging) every time task is finished or when no has finished in X time since last task has finished. Something like: ExecutorCompletionService<T> ecs; while (hasTasks()) { Future<T> future = ecs.poll(1 minute); some_action_like_logging(); if (future != null) { future.get() ... } ... } Are there straightforward ways to do all this with Java concurrency API? Or if it's going to complex no matter what with what's available in the JDK, is there a lightweight library that satisfies the requirements? I already have a partial solution that fits my particular use case (it cheats in a way, since I'm using two executors, and just so you know, it's not related at all to the web browser example I gave above), but I'd like to see a more general purpose and elegant solution.

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  • PHPMailer erroring out with Call to undefined method PHPMailer::SetFrom()

    - by dotty
    Hay I'm using PHPMailer to send some simple emails, however the function SetFrom() doesn't seem to work, even though the code I'm using is straight from phpmails docs (http://phpmailer.worxware.com/index.php?pg=examplebmail) Here my error Call to undefined method PHPMailer::SetFrom() and my script require_once('inc/phpmailer/class.phpmailer.php'); $mail = new PHPMailer(); // defaults to using php "mail()" $body = $message; $mail->SetFrom('[email protected]', 'tell a friend'); $mail->AddAddress($to_email, $to); $mail->Subject = "tell a friend"; $mail->MsgHTML($body); $mail->Send(); Any ideas? EDIT turns out the SetFrom() function doesnt exist in my version of phpmailer, i can set these values using $mail->From = ''; $mail->FromName = '';

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  • given two bits in a set of four, fine position of two other bits

    - by aaa
    hello I am working on a simple combinatorics part, and found that I need to recover position of two bits given position of other two bits in 4-bits srring. for example, (0,1) maps to (2,3), (0,2) to (1,3), etc. for a total of six combinations. My solution is to test bits using four nested ternary operators: ab is a four bit string, with two bits set. c = ((((ab & 1) ? (((ab & 2) ? ... ))) : 0) abc = ab | c recover the last bit in the same fashion from abc. can you think of a better way/more clever way? thanks

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  • Compressing assets post-update with Subversion

    - by Oskar Krawczyk
    I'm trying to find a way to compress specific assets post-update on a Production server. So far, I can't find any way to do this that's even remotely simple. Anyone has any insights/experience in doing this? Basically, what I need to do is run a Java utility to compress CSS and JS files - the problem with JS files is that they may or might not validate (JS errors), if it doesn't validate the Java utility will throw output a message. This makes the whole idea a bit more complicated.

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  • No speed-up with useless printf's using OpenMP

    - by t2k32316
    I just wrote my first OpenMP program that parallelizes a simple for loop. I ran the code on my dual core machine and saw some speed up when going from 1 thread to 2 threads. However, I ran the same code on a school linux server and saw no speed-up. After trying different things, I finally realized that removing some useless printf statements caused the code to have significant speed-up. Below is the main part of the code that I parallelized: #pragma omp parallel for private(i) for(i = 2; i <= n; i++) { printf("useless statement"); prime[i-2] = is_prime(i); } I guess that the implementation of printf has significant overhead that OpenMP must be duplicating with each thread. What causes this overhead and why can OpenMP not overcome it?

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  • How to get users to read error messages?

    - by FX
    If you program for a nontechnical audience, you find yourself at a high risk that users will not read your carefully worded and enlightening error messages, but just click on the first button available with a shrug of frustration. So, I'm wondering what good practices you can recommend to help users actually read your error message, instead of simply waiving it aside. Ideas I can think of would fall along the lines of: Formatting of course help; maybe a simple, short message, with a "learn more" button that leads to the longer, more detailed error message Have all error messages link to some section of the user guide (somewhat difficult to achieve) Just don't issue error messages, simply refuse to perform the task (a somewhat "Apple" way of handling user input) Edit: the audience I have in mind is a rather broad user base that doesn't use the software too often and is not captive (i.e., not an in-house software or narrow community). A more generic form of this question was asked on slashdot, so you may want to check there for some of the answers.

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  • JMenuBar dropping down to a "custom" JPanel and "erased"

    - by Jani
    The JMenuItems of JMenuBar drops down to a JPanel added to the JFrame, but the JPanel erases the JMenuItems. Do I supposed to pause the re-drawing of the JPanel? I'm using getGraphics() on the JPanel for drawing an image, this method is called from a thread with (for example) 200 ms delay. edit: It's a (very simple) game inside the JPanel. (I've added a field "paused" to the JPanel and i've edited the paint method so it repaints the JPanel only if paused is false, however I don't know if this "solution" is good. (It's set to true when the user clicks on a menu and set to false when selects or cancels it.)

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  • Explicit return form a Ruby method - implementation hiding, reuse and optimisations.

    - by Chris McCauley
    Hi, Rather than allowing a Ruby method to blindly return the last statement evaluated, is there any advantage to returning nil explicitly? In terms of implementation hiding and reuse, it seems dangerous to blindly allow the last expression evaluated to be returned - isn't there a danger that a user will rely on this only to get a nasty surprise when the implementation is modified? Surely returning nil would be better unless an explicit return value was given. Following on, is there an optimisation that Ruby can make when the return is a simple type rather than a reference to a more complex object? Chris

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