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  • Effective methods for reading and writing large files in C

    - by Bertholt Stutley Johnson
    I'm writing an application that deals with very large user-generated input files. The program will copy about 95 percent of the file, effectively duplicating it and switching a few words and values in the copy, and then appending the copy (in chunks) to the original file, such that each block (consisting of between 10 and 50 lines) in the original is followed by the copied and modified block, and then the next original block, and so on. The user-generated input conforms to a certain format, and it is highly unlikely that any line in the original file is longer than 100 characters long. Which would be the better approach? a) To use one file pointer and use variables that hold the current position of how much has been read and where to write to, seeking the file pointer back and forth to read and write; or b) To use multiple file pointers, one for reading and one for writing. I am mostly concerned with the efficiency of the program, as the input files will reach up to 25,000 lines, each about 50 characters long. Thanks!

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  • superfish vertical menu

    - by Dooie
    Hi Guy's, Im using jQuery with superfish vertical menu. My menu is positioned at the bottom of my page so the menu slides up, however, on hover of the menu items the sub items get lost at the bottom of my window. Below is a crude example of whats happening. menu item menu item menu item menu item > sub item browser bottom-------------------------- sub item sub item sub item This is my desired outcome menu item sub item menu item sub item menu item sub item menu item > sub item browser bottom-------------------------- Has anyone accomplished this?

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  • Strange routing

    - by astropanic
    How I can setup my rails app to respond to such urls: http://mydomain.com/white-halogene-lamp http://mydomain.com/children-lamps http://mydomain.com/contact-form The first one should link to my products controller, and show my product with this name The second one should link to my categories controller, and show the category with this name The third one should link to my sites controller, and show the site with this title. All three models (product, category, site) have a method to_seo, giving the mentioned above urls (after the slash) I know it's not the restful way, but please don't disuss here, it is wrong approach or not, that's not the question. The question is how to accomplish this weird routing ? I know we have catch all routes, but how I can tell rails to use different controllers on different urls in the catch all route ? Or have You an better idea ? I would avoid redirects to other urls.

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  • My form php is not working and I can't figure out where I went wrong

    - by user1081524
    I'm fairly new to all this, but I've created a form, and this is what I've written to send it. I've used "[email protected]" here instead of the real address <?php /* Set e-mail recipient */ $myemail = "[email protected]"; /* Check all form inputs using check_input function */ $names = check_input($_POST['names'], "Please return to our Application Form and enter your and your future spouse's names."); $weddingtype = check_input($_POST['weddingtype'], "Please return to our Application Form and fill in what kind of wedding you will be having."); $religioussect = check_input($_POST['religioussect'], "Please return to our Application Form and tell us about your religion and wedding traditions."); $dateone = check_input($_POST['dateone'], "Please return to our Application Form and give us the date for at least one event."); $eventone = check_input($_POST['eventone'], "Please return to our Application Form and list at least one event."); $locationone = check_input($_POST['locationone'], "Please return to our Application Form and give us the location for at least one event."); $durationone = check_input($_POST['durationone'], "Please return to our Application Form and give us the duration of at least one event."); $typeone = check_input($_POST['typeone'], "Please return to our Application Form and tell us whether you would like video, photo or both for at least one event."); $datetwo = $_POST['datetwo']; $eventtwo = $_POST['eventtwo']; $locationtwo = $_POST['locationtwo']; $durationtwo = $_POST['durationtwo']; $typetwo = $_POST['typetwo']; $datethree = $_POST['datethree']; $eventthree = $_POST['eventthree']; $locationthree = $_POST['locationthree']; $durationthree = $_POST['durationthree']; $typethree = $_POST['typethree']; $datefour = $_POST['datefour']; $eventfour = $_POST['eventfour']; $locationfour = $_POST['locationfour']; $durationfour = $_POST['durationfour']; $typefour = $_POST['typefour']; $guests1 = check_input($_POST['guests1'], "Please return to our Application Form and tell us how many guests will attend at least one event."); $guests2 = $_POST['guests2']; $guests3 = $_POST['guests3']; $guests4 = $_POST['guests4']; $concerns = $_POST['concerns']; if(!isset($_POST['submit'])){ $subject = "Quote Application"; /*Message for the e-mail */ $message = "Hello! Another happy couple has filled out a Quote Application Form :D Hooray! Their names are $names. What sort of wedding are they having? '$weddingtype'. What religious sect and wedding traditions are they following? '$religioussect'. Now for their wedding events... Ooh boy! 1. $dateone $eventone $durationone $typeone Estimated guests: $guests1 $locationone 2. $datetwo $eventtwo $durationtwo $typetwo Estimated guests: $guests2 $locationtwo 3. $datethree $eventthree $durationthree $typethree Estimated guests: $guests3 $locationthree 4. $datefour $eventfour $durationfour $typefour Estimated guests: $guests4 $locationfour Any concerns the couple have follow here: '$concerns' You better be ready to get to work now! And also, have a really good day :) "; /* Functions used */ function check_input($data, $problem='') { $data = trim($data); $data = stripslashes($data); $data = htmlspecialchars($data); if ($problem && strlen($data) == 0) { show_error($problem); } return $data; } function show_error($myError) { ?> <b>We apologize for the inconvenience, an error occurred.</b><br /> <?php echo $myError; ?> <?php exit(); } /* Send the message using mail() function */ mail($myemail, $subject, $message); /* Redirect visitor to the thank you page */ header('Location: thanks.html'); exit(); ?> Please help me find what I'm doing wrong, I'm barely a beginner here. Thanks in advance!

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  • Choice of programming language for learning data structures and algorithms

    - by bguiz
    Which programming language would you recommend to learn about data structures and algorithms in? Considering the follwing: Personal experience Language features (pointers, OO, etc) Suitability for learning DS & A concepts I ask because there are some books out there that are programming language-agnostic (written from a Mathematical perspective, and use pseudocode). If I learn from one of these I would like to work out the algorithms in a chosen language. Then, there are other books which introduce DS & A concepts with examples in a particular programming laguage - and I would follow these examples as well. Either way, I have to choose a language, and I would like to stick to one throughout. Which one best fits the bill.

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  • What Are Basic Tools For A New Project?

    - by Morgan Cheng
    For a long time, I thought that to start a new project we only need 3 basic tools. 1) A Build System (e.g. Maven & CruiseControl) 2) A Version Control System (e.g. CVS & SVN & GIT) 3) A Bug Tracking System (e.g. Bugzilla) Yesterday, a senior guy told me that we need at least one thing more. That is KPI(Key Performance Index). Without KPI, it is impossible to measure whether the project is progressing well or not. KPI is kind of SOFT tool compared to Maven/SVN/Bugzilla. I believe since I missed SOFT tools, there must be some other kind of tools I missed. So, anybody get some ideas what other basic tools necessary for a new project?

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  • Last in First out UDP structure in MatLab.

    - by D Zondervan
    I am using MatLabs UDP function in their instrument control toolbox to send data packets from one computer to another. The first computer is constantly updating data values and sending them to the other computer, and I want that computer to be able to query the first one for the most recent values whenever it needs them. However, the default implementation of the UDP send and receive in MatLab is a FIFO structure- the first packet I send is the first the other computer receives when they execute the "fscanf" function. I want the last packet I sent to be the one the fscanf function returns. Is this possible or do I need to use a different protocol?

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  • Where does C# and the .NET Framework fail?

    - by Nate Bross
    In my non-programming life, I always attempt to use the approprite tool for the job, and I feel that I do the same in my programming life, but I find that I am choosing C# and .NET for almost everything. I'm finding it hard to come up with (realistic business) needs that cannot be met by .NET and C#. Obviously embedded systems might require something less bloated than the .NET Micro Framework, but I'm really looking for line of business type situations where .NET is not the best tool. I'm primarly a C# and .NET guy since its what I'm the most comfertable in, but I know a fair amount of C++, php, VB, powershell, batch files, and Java, as well as being versed in the web technologes (javascript, html/css). But I'm open minded about it my skill set and I'm looking for cases where C# and .NET are not the right tool for the job. The bottom line here, is that I feel that I'm choosing C# and .NET simply because I am very comfertable with it, so I'm looking for cases where you have chosen something other than .NET, even though you are primarly a .NET developer.

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  • Overtime culture slowly creeping in - How do I handle this?

    - by bobsmith123
    Our company was one of the very few companies that did not enforce overtime. As such, all my team members promptly worked 40-48 hours a week and everything was good. We hired a few new developers and one of them has positioned himself to be a team lead. He has started working overtime, sending emails in the middle of the night which has come somewhat as a shock for the laid back team. Obviously, the higher ups seem to love him for being the "bad guy" enforcing overtime. Before this goes out of control, what steps do I take to stop this from continuing. I would rather not bring this up with the bosses for the fear of being seen as a whining team member. I am not sure if I should reply to his email outside work hours and encourage him to enforce this culture on our team. Thoughts?

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  • ruby / rails boolean method naming conventions

    - by Dennis
    I have a short question on ruby / rails method naming conventions or good practice. Consider the following methods: # some methods performing some sort of 'action' def action; end def action!; end # some methods checking if performing 'action' is permitted def action?; end def can_action?; end def action_allowed?; end So I wonder, which of the three ampersand-methods would be the "best" way to ask for permissions. I would go with the first one somehow, but in some cases I think this might be confused with meaning has_performed_action?. So the second approach might make that clearer but is also a bit more verbose. The third one is actually just for completeness. I don't really like that one. So are there any commonly agreed-on good practices for that?

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  • Multiblog engine for asp.net

    - by Andrey
    I know, different forms of this questions were asked on this site multiple times, but I haven't seen a single answer that would satisfy my need. I need a ASP.NET based blogging engine that wouul use SQL Server as a back end and allow multiple independet blogs in one app instance. I'm writing a community website for major bank and blogging is the piece I'm not sure about. Answers to other questions include a broad spectrum from BlogEngine.NET (doesn't support multiple blogs) to CommunityServer (a beast! blogging is just asmall piece of it). I don't want to install a full-blown CRM and just use blogging, I want a blogging engine. I don't mind to buy a commercial one but I can't find one. I'm pretty much stuck, and any ideas are highly appreciated!

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  • C#: Farm out jobs to worker processes on a multi-processor machine

    - by Andrew White
    Hi there, I have a generic check that needs to be run on ca. 1000 objects. The check takes about 3 seconds. We have a server with 4 processors (and we also have other multi-processor servers in our network) so we would like to create an exe / dll to do the checking and return the results to the "master". Does anyone know of a framework for this, or how would one go about it in C#? Specifically: * What's the best way to transfer data between the master and the worker process? * How would the master ensure that always 4 processes are running at any one time and as soon as a worker process is finished start a new one. * How to register that the worker is finished and append it's results to a list? Hope it's clear enough but happy to clarify. A.

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  • Linux / C++: Get the IP Address of local computer

    - by BlaM
    This Question is almost the same as the previously asked Get the IP Address of local computer-Question. However I need to find the IP address(es) of a Linux Machine. So: How do I - programmatically in C++ - detect the IP addresses of the linux server my application is running on. The servers will have at least two IP addresses and I need a specific one (the one in a given network (the public one)). I'm sure there is a simple function to do that - but where? [EDIT] To make things a bit clearer: The server will obviously have the "localhost": 127.0.0.1 The server will have an internal (management) IP address: 172.16.x.x The server will have an external (public) IP address: 80.190.x.x I need to find the external IP address to bind my application to it. Obviously I can also bind to INADDR_ANY (and actually that's what I do at the moment). I would prefer to detect the public address, though.

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  • Resources to learn about engineering aspects of data analytics (OLAP, warehousing, ETL, etc.)

    - by JT
    I'm a math/stats guy, interested in learning more about the engineering aspects of "data analytics" (this may be an overly broad term, this is a case of "I don't know what I don't know", so I'm not sure how to be more specific). I'm fine with manipulating and analyzing the data once it's already stored somewhere and I can access it, and I'm fine with writing scripts and SQL queries (and have a general knowledge of things like normalization). What I don't know is the whole engineering process of capturing and storing the data. For example, terms I've heard thrown about that I only vaguely understand the meaning of include: - OLAP, OLTP - Data warehousing - ETL - ??? What's a good book (or any other resource) to learn about these kinds of things? What are things I should know about database design (normalization seems kinda "obvious" to me, something I would have done even before I knew the term -- is there anything else?)? In other words, for jobs falling under the umbrella term of "analytics engineer", what kinds of things should I know?

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  • table cell background color change problem

    - by Mellon
    I work on another guy's code, and I try to change the table cell background color when mouse over the cell, and change back to the original background color when mouse leave. I use the following code: var bgcolor=$(".cell-el").css("background-color") $(".cell-el").hover( function(){ $(this).css("background-color", "#3c3c36")}, //mouse enter, bg-color change function(){ $(this).css("background-color", bgcolor) // mouse leave, bg-color change back }) Things are working fine, EXCEPT that when mouse first time enter the cell, the cell background color is not changed to "#3c3c36", but when mouse leave the cell after first entering and enter in the cell again, the cell's background color changed to "#3c3c36". That's the cell color never change for mouse first enter, after that, everything is working great. What's could be the cause of this problem?

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  • Load a controller into an other controller in cakephp

    - by john
    im developing a web application, using multiple pages, each with their own controller. The problem now is that there are some variables in a controller, created for one page, that are required for an other page ( with a different controller). Therefor i need to load one controller into the other one. I did this by adding App::import('Controller', 'sections'); $sections= new sectionsController; $sections-constructClasses(); to the controller, but this doens't seem to work.. Maybe u guys have some ideas? Thnx in advance!

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  • Can i make products on Paypal site

    - by Mirage
    I offer hosting to only 2 clients for 2 diff products. I don't want to build the site and tell them to pay. Is is possible that on my paypal account i create two products like Product1 - monthly subscription 20 product 2 - monnthly yearly subscription 150 So that i can just send them the link and it automatically gets deducted from their account. One thing more can i send same link to other client as well who has bought the same product. Can i group them in paypal system to see which one has paid and which one does not Thanks

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  • Why is only the suffix of work_index hashed?

    - by Jaroslav Záruba
    I'm reading through the PDF that Brett Slatkin has published for Google I/O 2010: "Data pipelines with Google App Engine": http://tinyurl.com/3523mej In the video (the Fan-in part) Brett says that the work_index has to be a hash, so that 'you distribute the load across the BigTable': http://www.youtube.com/watch?v=zSDC_TU7rtc#t=48m44 ...and this is how work_index is created: work_index = '%s-%d' % (sum_name, knuth_hash(index)) ...which I guess creates something like 'mySum-54657651321987' I do understand the basic idea, but is why only one half of work_index is hashed? Is it important to hash only part of it leaving the suffix out? Would it be wrong to do md5('%s-%d' % (sum_name, index)) so that the hash would be like '6gw8....hq6' ? I'm Java guy so I would use md5 to hash, which means I get id like 'mySum' + 32 characters. (Obviously I want my ids/keys to be as short as possible here.) If I could hash the whole string my id would be just 32 chars. Or would you suggest to use something else to do the hashing with?

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  • what are the most essential bundles in symfony2?

    - by user
    this question but i hope it does not, i'll try my best to make clarify it I'm new to symfony2 but not to php, as far as i know, everything in symfony2 is bundles. Being a django guy, i know that the essential apps are: south Django-Debug-Toolbar Haystack Search Django Admin Tools (maybe) fabric the registration and user profile app (unless you decide to use django-userena) Piston I'm not going to make a longer list, you get the point. I know 2 essential apps for symfony2 so far the admin generator and FOSUserBundle. So what are other must have bundles?

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  • mysql 2 primary key onone table

    - by Bharanikumar
    CREATE TABLE Orders -> ( -> ID SMALLINT UNSIGNED NOT NULL, -> ModelID SMALLINT UNSIGNED NOT NULL, -> Descrip VARCHAR(40), -> PRIMARY KEY (ID, ModelID) -> ); Basically May i know ... Shall we create the two primary key on one table... Is it correct... Bcoz as per sql law,,, We can create N number of unque key in one table, and only one primary key only is the LAW know... Then how can my system allowing to create multiple primary key ? Please advise .... what is the general rule

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  • Get the closest number

    - by user183089
    Hi, i am implementing a little Black Jack game in C# and i have the following problem calculating the player's hand value. the problem is Ace may have value of 1 or 11 so if the players has three cards and one Ace if the sum of the cards is <= 10 Ace will have value of 11(Sorry for who doesn't know the scope of the game is to reach 21 with the sum of the cards) Other way value of 1 Up to here is easy Now lets assume i do not know how many Aces the player has got and the game is implemented giving the possibility to the dealer to use more than one deck of cards. the user may have in one hand even 5,6,7,8 ... aces. What is the best way(possibly using Linq) to evaluate all the aces the player has got to get the closest combination to 21 (in addition tot he other cards)? I hope i have been clear thanks for your help.

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  • jQuery Event Keypress: Which key was pressed?

    - by BlaM
    With jQuery, how do I find out which key was pressed when I bind to the keypress event? $('#searchbox input').bind('keypress', function(e) {}); I want to trigger an submit when ENTER is pressed. [Update] Even though I found the (or better: one) answer myself, there seems to be some room for variation ;) Is there a difference between keyCode and which - especially if I'm just looking for ENTER, which will never be a unicode key? Do some browsers provide one property and others provide the other one?

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  • Sign Up/Login system for multi-domain/multi-server

    - by David
    I'm thinking about a good solution for implementing a sign up/login system that works across different domains and servers. A working example is Olx (you can register in one domain, and your login will work in the rest of domains). The scenario is that every domain (one per country) has its own database. And there will be 2 servers (for example), each one will have the 50% of the domains (and so the 50% of databases). What would you suggest to start with? Database: MySQL 5.1 Server-side language: PHP 5.3 (I will be using Symfony 1.4, so if someone has some suggestion for this framework, it will be interesting too, although it is optional)

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  • many to many tables linked to grid view

    - by yousof
    i have web page that save data for stores, these stores have activities i want to determine the activities for those stores. this reason i make three tables: first one is : tbOLActivity has fields: ActivityId int (pk), ActivityName nvarchar(50) second one is : tbOLStore has fields: StoreId int (pk), StoreName nvarchar(50), ActivityId int (fk), Address navrchar(50) therd one is: tbOLStoreActivty has fields : SerialNo int (pk), StoreId int (fk), ActivityId int (fk), Activity_Status int i make combobox in web page called "AcivityCombo" to display the data of tbOLActivity table If CtvAct.GetRecords("Fill_ActivityTb") = True Then AcivityCombo.DataSource = CtvAct.MainDataset.Tables("tbOLActivity").DefaultView AcivityCombo.DataTextField = "ActivityName" AcivityCombo.DataValueField = "ActivityId" AcivityCombo.DataBind() the problem is how to select item from this combo and insert it into gridview then save data into the tables

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  • What does the '&' operator do in C++?

    - by rascher
    n00b question. I am a C guy and I'm trying to understand some C++ code. I have the following function declaration: int foo(const string &myname) { cout << "called foo for: " << myname << endl; return 0; } How does the function signature differ from the equivalent C: int foo(const char *myname) Is there a difference between using string *myname vs string &myname? What is the difference between & in C++ and * in C to indicate pointers? Similarly: const string &GetMethodName() { ... } What is the & doing here? Is there some website that explains how & is used differently in C vs C++?

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