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  • Qt vs .NET - plz no n00bs who don't know wtf they're talking about [closed]

    - by Pirate for Profit
    Man in all these Qt vs. .NET discussions 90% these people don't know WTF they're talking about. Trying to get a real comparison chart going before we embark on a major fucking project. And yes I'm drunk, and yes I use cocaine. Event Handling In Qt the event handling system you just emit signals when something cool happens and then catch them in slots, for instance emit valueChanged(int percent, bool something); and void MyCatcherObj::valueChanged(int p, bool ok){} blocking them and disconnecting them when needed, doing it across threads... once you get the hang of it, it just seems a lot more natural and intuitive than the way the .NET event handling is set up (you know, object sender, CustomEventArgs e). And I'm not just talking about syntax, because in the end the .NET delegate crap is the bomb. I'm also talking about in more than just reflection (because, yes, .NET obviously has much stronger reflection capabilities). I'm talking about in the way the system feels to a human being. Qt wins hands down i m o. Basically, the footprints make more sense and you can visualize the project easier without the clunky event handling system. I wish I could it explain it better. The only thing is, I do love some of the ease of C# compared to C++ and .NET's assembly architecture. That is a big bonus for modular projects, which are a PITA to do in C++. Database Ease of Doing Crap Also what about datasets and database manipulations. I think .net wins here but I'm not sure. Threading/Conccurency How do you guys think of the threading? In .NET, all I've ever done is make like a list of master worker threads with locks. I like QConcurrentFramework, you don't worry about locks or anything, and with the ease of the signal slot system across threads it's nice to get notified about the progress of things. Memory Usage Also what do you think of the overall memory usage comparison. Is the .NET garbage collector pretty on the ball and quick compared to the instantaneous nature of native memory management? Or does it just let programs leak up a storm and lag the computer then clean it up when it's about to really lag? However, I am a n00b who doesn't know what I'm talking about, please school me on the subject.

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  • ORA-12514 TNS:listener does not currently know of service requested in connect descriptor

    - by Jacques
    We have an application running locally which two days worked fine and now we get the: TNS:listener does not currently know of service requested in connect descriptor error. I've tested the connection using TNSPing which resolved correctly and Tried SQLPlus to try connecting, which failed with the same error. (i.e. Sqlplus username/passowrd@addressname[or host name] The TNS Listener on the server is running. Oracle itself on the server is running. We don't know of any changes that were made to this environment. Anything else we can test to figure this one out? Thanks, Jacques

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  • Should developers know how to use office suites?

    - by systempuntoout
    How deep is your knowledge on Office suites? Personally i don't like them, i hate create and manage word documents, excel datasheets etc. etc. I'm not talking about opening a word document and write some text or calculate sum and division on excel; i'm talking about advanced features like revisions, vba macros and so on. I have a co-worker, actually he's a talented functional analyst, that don't know anything about programming but he's kind a monster guru on Microsoft Office suite. When he sits on my desk and asks me to open and modify some of his hardly complicated Microsoft Excel multicolor multipivotal recursive datasheet, ehm, i feel like a baby in front of a nuclear plant console.It' not a great feeling if you know what i mean. As programmer, do you feel guilty about not knowing office suites enough?

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  • how do I know when/where to invoke the overridden method of the super class

    - by Henry
    Hi, This question occured to me while programming a Android application, but it seems to be a general programming question more. The situation is, I am extending (subclass-ing) an class from a library, and overriding a method. how do I know if I should invoke the method of super-class? and when? (in the beginning of the overridden method or in the end?) For example, I am overriding the method "public boolean onCreateOptionsMenu(Menu menu)" from class "Activity" in Android platform. And I saw someone write "return super.onCreateOptionsMenu(menu)" in the end of the method, in an example. But how do I know it should be done this way? and it is correct or not? what's the difference if I begin my method with "super.onCreateOptionsMenu(menu)"? BR, Henry

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  • Rake don't know how to build task?

    - by Schroedinger
    Using a rake task to import data into a database: file as follows namespace :db do desc "load imported data from csv" task :load_csv_data => :environment do require 'fastercsv' require 'chronic' FasterCSV.foreach("input.csv", :headers => true) do |row| Trade.create( :name => row[0], :type => row[4], :price => row[6].to_f, :volume => row[7].to_i, :bidprice => row[10].to_f, :bidsize => row[11].to_i, :askprice => row[14].to_f, :asksize => row[15].to_i ) end end end When attempting to use this, with the right CSV files and the other elements in place, it will say Don't know how to build task 'db:import_csv_data' I know this structure works because I've tested it, I'm just trying to get it to convert to the new values on the fly. Suggestions?

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  • Know if a variable is a native object in javascript

    - by mck89
    Hi, is there a way to know if a variable passed into a function is a native object? I mean, i have a function that requires only native objects as arguments, for every other type of variable it throws an error. So: func(Array); //works func(String); //works func(Date); //works func(Object); //works ... func([]); //Throwr error func({}); //Throws error I want to know if there's a way to distinguish between native objects and everything else.

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  • Do you know a good and efficient FFT?

    - by yan bellavance
    Hi, I am trying to find a very fast and efficient Fourier transform (FFT). Does anyone know of any good ones. I need to run it on the iPhone so it must not be intensive. Instead, maybe you know of one that is wavelet like, i need frequency resolution but only a narrow band (vocal audio range up to 10khz max...even 10Khz might be too high). Im thinking also of truncating this FFT to keep the frequency resolution while eliminating the unwanted frequency band. This is for an iphone ...I have taken a look at the FFT in Aurio touch but it seems this is an int FFT but my app uses floats.....would it give a big performance increase to try and adapt program to an int FFT or not(which i really dont feel like doing...plus aurio touch uses a radix 2 FFT which is not that great).

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  • Unix makefile errors " 'ake: Fatal error: Don't know how to make (c file here)"

    - by gwenger
    I've written the below makefile: hw2p1: hw2p1_main.o hw2p1_getit.o hw2p1_parseit.o hw2p1_moveit.o hw2p1_showit.o gcc hw2p1_main.o hw2p1_getit.o hw2p1_parseit.o hw2p1_moveit.o hw2p1_showit.o hw2p1_main.o: hw2p1_main.c gcc -c hw2p1_main.c hw2p1_getit.o: hw2p1_getit.c gcc -c hw2p1_getit.c hw2p1_parseit.o: hw2p1_parseit.c gcc -c hw2p1_parseit.c hw2p1_moveit.o: hw2p1_moveit.c gcc -c hw2p1_moveit.c hw2p1_showit.o: hw2p1_showit.c gcc -c hw2p1_showit.c The first time I tried to call make, I got the error: "make: Fatal error: unexpected end of line seen" I deleted the blank lines between targets and called make again, but this time I got " 'ake: Fatal error: Don't know how to make hw2p1_main.c" I've compiled all of these files separately and then linked them so I know that the errors are a result of an incorrect makefile and not a result of errors in my c files. This is the first makefile that I've ever written so I might just be doing it completely incorrectly. Either way, any suggestions on how to get rid of these errors?

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  • Do you know any code sharing sites?

    - by jasondavis
    I am always looking to organize and make my resource bookmarks better and easiar to access when I need them. 1 thing I really like is code sharing sites, they let you enter in code and then give you a special link to give a friend or a user on this site even to show then code, This is a very useful tool I believe. So below is my list of code sharing sites, there is 4 on the list and they all have unique features. Some have syntax highlighting for multiple languages, some allow you to save your code as private and only share with the people you give the link to, and some even run the run and output any possible errors. Do you know of any sites like this? if you know of any sites like this for programming code please post it here. http://pastie.org/ http://codepad.org/ http://pastebin.me/ http://jsbin.com/ allows you to auto-insert a javascript library like jquery and test live js code

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  • PyQt: How to Know Progress of a Process Running background

    - by krishnanunni
    Hello there. Im in real confusion with the ProgressBar mechanisms. However now i need help on this "Can we know the percentage completion or time remaining of completion of a Process, that has been initiated from a Qt interface like this ` self.process = QProcess() self.connect(self.process, SIGNAL("readyReadStdout()"), self.readOutput) self.connect(self.process, SIGNAL("readyReadStderr()"), self.readErrors) tarsourcepath="sudo tar xvpf "+ self.path1 self.process.setArguments(QStringList.split(" ",tarsourcepath)) self.textLabel3.setText(self.__tr("Extracting.....")) self.process.start()` slots readOUtput just implements the collection of data fron stdout and transferring it to a text browser. I need to know is there any way we could monitor the ongoing process, making to knowpercentage completion, so that i can manage a progressbar for this. Thanks Experts

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  • VS2008 Complains about css class names it should know about

    - by Matt Dawdy
    I've seen this in a webcast somewhere, but I can't remember where, and all searching terms I'm trying are coming up unhelpful. I've got a stylesheet for my site, and it's referenced in a master page. Child pages that use this master page use these styles, but .Net doesn't know about them. When the site is run, it all works great, but I'm trying to figure out how to get .Net to know about them at design time. This should also fix the issue with not knowing about the javascript files I'm including, too -- I think it's all related and I can't for the life of me figure out how.

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  • git: programmatically know by how much the branch is ahead/behind a remote branch

    - by Olivier
    I would like to extract the information that is printed after a github status, which looks like: # On branch master # Your branch is ahead of 'origin/master' by 2 commits. Of course I can parse the output of git status but this is not recommended since this human readable output is liable to change. There are two problems: How to know the remote tracked branch? It is often origin/branch but need not be. How to get the numbers? How to know whether it is ahead/behind? By how many commits? And what about the diverged branch case?

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  • What should I know to begin Developing Applications with smart card

    - by Muhammad Nour
    I am using .Net 2.0 C# The Reader is ACR83 which can be found hxxp://www.acs.com.hk/index.php?pid=product&id=ACR83 and for the Card it self I am using ACOS3-32 also from the same company hxxp://www.acs.com.hk/index.php?pid=product&id=ACOS3 Also I have a .net wrapping for the local winscard api from the vendor SDK ok, this is my first time developing apps with smart card I need to Know what should I know to begin developing applications using smart card for now I need to use the smart card for authentication in a login process in a simple login form what should I put on the card and how should I read the contents from it also I need to encrypt the contents

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  • Getting the height of text to know fill height as in TCPDF

    - by sami
    I'm trying to go through the code of TCPDF to understand how it calculates the height of the text to be rendered, but it's too much for me to handle without asking. What I want to know: in the PDF from example 5 http://www.tcpdf.org/examples/example_005.pdf it gives the cell a yellow background. I'm guessing that at the basic level, it first draws a box with this fill color, then adds the text, so what method is it calling to get the height of the text to know the height of the box to fill? Anyone knows how to trace this, because doing it by hand and looking through the code isn't working at all for me.

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  • postgres store with composite value type, or a better way of attributing an inverted index

    - by Hassan Syed
    can't seem to figure out the syntax for populating a hstore with a value of composite type -- note: I do not want to convert a record to a hstore. select hstore('hello => ROW(1,2)'); I know it's something simple; However, google is not my friend today. use case : custom inverted index. The data is modelling an inverted index of lexemes, the composite data types are various probabilities related to the lexemes which I will use to implement document clustering. Does anyone know a better way of doing this ? I'm open to using an external system if it allows attaching attributes to key-posting pairs in the inverted index. I'd use something external if it had solid support for what I am trying to do, I suspect that sticking 3-10k lexemes per tuple and then doing batch processing on them is gonna be nasty as the whole hstore will have to be parsed and converted .

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  • What to know - for building a form with PHP and MySQL

    - by Tal Galili
    Hello all, I have three weeks to perform the following basic task. I wish to create an online form in PHP that will get 5 numbers and with them: save the numbers to a MySQL DB do a simple computation on the numbers and return them as an output to the visitor I already have a domain, hosting and a MySQL database+user. I don't know PHP, or SQL or databases. I do have prior knowledge in C and R (which means I have some of the basics of programming, and I am not intimidated of a new languages). My question are: Am I missing something? is there some other skill I should have for this task that I don't know of? What is a good way to learn the skills needed for the task I described? Hope the question isn't too basic/general. Thanks!

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  • how to know what files or folder are changed before do commit

    - by Pedro
    My problem is how to know what files or folder are changed before do commit. I can add all the new files in my working copy before do commit, and the repository changes, but if for example i delete one file of the working copy i dont know the way to add this change before do commit. When you use the tortoise for example before do commit the program shows all the changes of the working copy and you can choose what changes commit and what changes dont. There is some way to do this usin sharp svn?? thanks for your answer!!!

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  • How to know file type without extension

    - by Ayusman
    While trying to come-up with a servlet based application to read files and manipulate them (image type conversion) here is a question that came up to me: Is it possible to inspect a file content and know the filetype? Is there a standard that specifies that each file MUST provide some type of marker in their content so that the application will not have to rely on the file extension constraints? Consider an application scenario: I am creating an application that will be able to convert different file formats to a set of output formats. Say user uploads an PDF, my application can suggest that the possible conversion formats are microsoft word or TIFF or JPEG etc. As my application will gradually support different file formats (over a period of time), I want my application to inspect the input file instead of having the user to specify the format. And suggest to user the possible formats of output. I understand this is an open ended, broad question. Please let me know if it needs to be modified. Thanks, Ayusman

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