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  • Good Literature for "Object oriented programming in C"

    - by Dipan Mehta
    This is not a debate question about whether or not C is a good candidate for Object oriented programming or not. Quite often C is the primary platform where the development is happening. I have seen, and hopefully learnt through crawling many open source and commercial projects - that while the language inherently doesn't stop you if you create "non-object" code. However, you can still think in the "Object" way and reasonably write code that captures this designs thinking. For those who has done this, OO way is still the best way to write code even when you are programming in C. While, I have learnt most of it through the hard way, are there any deep literature that can help educate the relatively young guys about how to do OO programming in C?

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  • Possible for one developer to work on a site thats on another developer's server?

    - by cire4
    Sorry for the confusing title. Let me explain: I am currently trying to get a site developed. My current developer has taken the site about as far as I think they are capable of and I am planning on hiring another developer to put the finishing touches on it, debug it and upgrade some of the more technical details. The site is hosted on my current developer's server. They are scheduled to work on it until mid-April, at which point they will transfer the site to my server. I would like the new developer to get started on the upgrades to the site as soon as possible. So my question is this: Is it possible for the new developer to start working on upgrades to the site while it is still on the old developer's server (and without the old developer knowing about it)? Would the new developer have to create a mirror site and work on it that way? I'm having trouble imagining if this is possible so any advice you can offer would be much appreciated!

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  • What is your most preferred method of site pagination?

    - by John Smith
    There seem to be quite a few implementations of this feature. Some sites like like Stackexchange have it laid out like this: [1][2][3][4][5] ... [954][Next] Other sites like game forums may have something like this: [1][2][3] ... [10] ... [50] ... [500] ... [954][Next] Some sites like webcomics (XKCD comes to mind) have it laid out like this: [Last][Prev][Random][Next][First] Reddit has a very simple pagination with only: [Prev][Next] Sites like Stackexchange and Google also allow you to change how many results you want per page. Personally, I have never used this feature. Is it even worth including or does it just further confuse the design with needless features? Personally, I have only ever seen the need for the webcomic style (without the random). If I need to go to a specific page (which is very, very rare) then I can just edit the address bar. Is it good design to make something more complex for rare occasions where it might make save the user some time? Is having to edit the address bar to navigate the site effectively in some circumstances bad design?

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  • Access functions from user control without events?

    - by BornToCode
    I have an application made with usercontrols and a function on main form that removes the previous user controls and shows the desired usercontrol centered and tweaked: public void DisplayControl(UserControl uControl) I find it much easier to make this function static or access this function by reference from the user control, like this: MainForm mainform_functions = (MainForm)Parent; mainform_functions.DisplayControl(uc_a); You probably think it's a sin to access a function in mainform, from the usercontrol, however, raising an event seems much more complex in such case - I'll give a simple example - let's say I raise an event from usercontrol_A to show usercontrol_B on mainform, so I write this: uc_a.show_uc_b+= (s,e) => { usercontrol_B uc_b = new usercontrol_B(); DisplayControl(uc_b); }; Now what if I want usercontrol_B to also have an event to show usercontrol_C? now it would look like this: uc_a.show_uc_b+= (s,e) => { usercontrol_B uc_b = new usercontrol_B(); DisplayControl(uc_b); uc_b.show_uc_c += (s2,e2) => {usercontrol_C uc_c = new usercontrol_C(); DisplayControl(uc_c);} }; THIS LOOKS AWFUL! The code is much simpler and readable when you actually access the function from the usercontrol itself, therefore I came to the conclusion that in such case it's not so terrible if I break the rules and not use events for such general function, I also think that a readable usercontrol that you need to make small adjustments for another app is preferable than a 100% 'generic' one which makes my code look like a pile of mud. What is your opinion? Am I mistaken?

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  • What would be the Query to get exact same result like Windows 7 start menu search for Programs using Windows Search service?

    - by Somnath
    I would like to implement the same search application like Windows 7 using microsoft.search.interop.dll, C#. Currently I'm using System.Kind property to retrieve information regarding the programs from Windows Search but the results set does not look same like Windows 7 search. Order of items are different. SELECT TOP 3 System.ItemNameDisplay, System.DateAccessed FROM SystemIndex WHERE System.ItemNameDisplay LIKE 'ad%' AND (System.Kind='Program') What would be the Query to get exact same result like Windows 7 start menu search for Programs? As an example : search token = 'ad' Windows 7 search result Adobe Reader 9, Add a device, Adobe Photoshop 7.0 Search Result from my code Adobe ImageReady 7.0 , Adobe Photoshop 7.0 , Adobe Reader 9

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  • How to use OO for data analysis? [closed]

    - by Konsta
    In which ways could object-orientation (OO) make my data analysis more efficient and let me reuse more of my code? The data analysis can be broken up into get data (from db or csv or similar) transform data (filter, group/pivot, ...) display/plot (graph timeseries, create tables, etc.) I mostly use Python and its Pandas and Matplotlib packages for this besides some DB connectivity (SQL). Almost all of my code is a functional/procedural mix. While I have started to create a data object for a certain collection of time series, I wonder if there are OO design patterns/approaches for other parts of the process that might increase efficiency?

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  • Quickly compute added and removed lines

    - by Philippe Marschall
    I'm trying to compare two text files. I want to compute how many lines were added and removed. Basically what git diff --stat is doing. Bonus points for not having to store the entire file contents in memory. The approach I'm currently having in mind is: read each line of the old file compute a hash (probably MD5 or SHA-1) for each line store the hashes in a set do the same for each line in the new file every hash from the old file set that's missing in the new file set was removed every hash from the new file set that's missing in the old file set was added I'll probably want to exclude empty and all white space lines. There is a small issue with duplicated lines. This can either be solved by additionally storing how often a hash appears or comparing the number of lines in the old and new file and adjust either the added or removed lines so that the numbers add up. Do you see room for improvements or a better approach?

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  • saving and retrieving a text file in java?

    - by user3319432
    import java.sql. ; import java.awt.; import javax.swing.; import java.awt.event.; public class saving extends JFrame implements ActionListener{ JTextField edpno=new JTextField(10); JLabel l0= new JLabel ("EDP Number: "); JComboBox fname = new JComboBox(); JLabel l1= new JLabel("First Name: "); JTextField lname= new JTextField(20); JLabel l2= new JLabel("Last Name: "); // JTextField contno= new JTextField(20); // JLabel l3= new JLabel("Contact Number: "); JComboBox contno = new JComboBox(); JLabel l3 = new JLabel ("Contact Number: "); JButton bOK = new JButton("Save"); JButton bRetrieve = new JButton("Retrieve"); private ImageIcon icon; JPanel C=new JPanel(){ protected void paintComponent(Graphics g){ g.drawImage(icon.getImage(),0,0,null); super.paintComponent(g); } }; public Search Record (){ icon=new ImageIcon("images/canres.png"); C.setOpaque(false); C.setLayout(new GridLayout(5,2,4,4)); setTitle("Search Record"); C.add (l0); C.add (edpno); edpno.addActionListener(this); C.add (l1); C.add (fname); fname.setForeground(Color.BLUE); fname.setFont(new Font(" ", Font.BOLD,15)); C.add (l2); C.add (lname); C.add (l3); C.add (contno); contno.setForeground(Color.BLUE); contno.setFont(new Font(" ", Font.BOLD,15)); C.add(bOK); bOK.addActionListener(this); C.add (bRetrieve); bRetrieve.addActionListener(this); bOK.setBackground(Color.white); bRetrieve.setBackground(Color.white); } public void saverecord(){ try{ //Connect to the Database Class.forName("sun.jdbc.odbc.JdbcOdbcDriver"); String path ="jdbc:odbc:;DRIVER=Microsoft Access Driver (*.mdb);DBQ=Database/roomassign.mdb"; String DBPassword =""; String DBUserName =""; Connection con = DriverManager.getConnection(path,"",""); Statement s = con.createStatement(); s.executeQuery("select firstname, Lastname, contact number from name WHERE edpno ='"+edpno.getText()+"'"); ResultSet rs = s.getResultSet(); ResultSetMetaData md = rs.getMetaData(); while(rs.next()) { fname.setSelectedItem(rs.getString(1)); lname.setText(rs.getString(2)); contno.setSelectedItem(rs.getString(3)); // crs.setSelectedItem(rs.getString(4)); } s.close(); con.close(); } catch(Exception Q) { JOptionPane.showMessageDialog(this,Q); } } public void SaveRecord(){ try{ Class.forName("sun.jdbc.odbc.JdbcOdbcDriver"); String path = "jdbc:odbc:;DRIVER=Microsoft Access Driver (*.mdb);DBQ=Database/roomassign.mdb"; String DBPassword =""; String DBUsername =""; Connection con = DriverManager.getConnection(path,"",""); Statement s = con.createStatement(); String sql = "UPDATE rooms SET Firstname='"+fname.getSelectedItem()+"',Lastname='"+lname.getText()+"',Contactnumber='"+contno.getSelectedItem()+"' WHERE '"+edpno.getText()+"'=edpno"; s.executeUpdate(sql); JOptionPane.showMessageDialog(this,"New room Record has been successfully saved"); dispose(); s.close(); con.close(); } catch(Exception Mismatch){ JOptionPane.showMessageDialog(this,Mismatch); } } public void actionPerformed (ActionEvent ako){ if (ako.getSource() == bRetrieve){ dispose(); } else if (ako.getSource() == bOK){ SaveRecord(); } } public static void main (String [] awtsave){ new Search(); } }

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  • Serialized values or separate table, which is more efficient?

    - by Aravind
    I have a Rails model email_condition_string with a word column in it. Now I have another model called request_creation_email_config with the following columns admin_filter_group:references vendor_service:references email_condition_string:references email_condition_string has many request_creation_email_config and request_creation_email_config belongs to email_condition_string. Instead of this model a colleague of mine is suggesting that strong the word inside the same model as comma separated values is efficient than storing as a separate model. Is that alright?

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  • Tips for a first year CS student looking for a summer internship to gain experience?

    - by Matt
    Hello all, I am a first year CS student and my programming experience is only what I have obtained in my computer programming I and II classes this school year. (console applications in C++) I want to find a summer job/internship that would help me build my skill set. Being that I am still such a beginner pay is not a concern, minimum wage would be nice, but as long as I am learning, I really don't care. My current resume just lists a bunch of random jobs i've had in the past (burger king, summer camps, best buy, etc.) Does anyone have any tips (places to look? things to put on resume?) that might help me?

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  • A new mission statement for my school's algorithms class

    - by Eric Fode
    The teacher at Eastern Washington University that is now teaching the algorithms course is new to eastern and as a result the course has changed drastically mostly in the right direction. That being said I feel that the class could use a more specific, and industry oriented (since that is where most students will go, though suggestions for an academia oriented class are also welcome) direction, having only worked in industry for 2 years I would like the community's (a wider and much more collectively experienced and in the end plausibly more credible) opinion on the quality of this as a statement for the purpose an algorithms class, and if I am completely off target your suggestion for the purpose of a required Jr. level Algorithms class that is standalone (so no other classes focusing specifically on algorithms are required). The statement is as follows: The purpose of the algorithms class is to do three things: Primarily, to teach how to learn, do basic analysis, and implement a given algorithm found outside of the class. Secondly, to teach the student how to model a problem in their mind so that they can find a an existing algorithm or have a direction to start the development of a new algorithm. Third, to overview a variety of algorithms that exist and to deeply understand and analyze one algorithm in each of the basic algorithmic design strategies: Divide and Conquer, Reduce and Conquer, Transform and Conquer, Greedy, Brute Force, Iterative Improvement and Dynamic Programming. The Question in short is: do you agree with this statement of the purpose of an algorithms course, so that it would be useful in the real world, if not what would you suggest?

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  • Better solution then simple factory method when concrete implementations have different attributes

    - by danip
    abstract class Animal { function eat() {..} function sleep() {..} function isSmart() } class Dog extends Animal { public $blnCanBark; function isSmart() { return $this->blnCanBark; } } class Cat extends Animal { public $blnCanJumpHigh; function isSmart() { return $this->blnCanJumpHigh; } } .. and so on up to 10-20 animals. Now I created a factory using simple factory method and try to create instances like this: class AnimalFactory { public static function create($strName) { switch($strName) { case 'Dog': return new Dog(); case 'Cat': return new Cat(); default: break; } } } The problem is I can't set the specific attributes like blnCanBark, blnCanJumpHigh in an efficient way. I can send all of them as extra params to create but this will not scale to more then a few classes. Also I can't break the inheritance because a lot of the basic functionality is the same. Is there a better pattern to solve this?

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  • How come verification does not include actual testing?

    - by user970696
    Having read a lot about this topic, I still did not get it. Verification should prove that you are building the product right, while validation you build the right product. But only static techniques are mentioned as being verification methods (code reviews, requirements checks...). But how can you say if its implemented correctly if you do not test it? It is said that verification checks e.g. code for its correctnes. Verification - ensure that the product meet specified requirements. Again, if the function is specified to work somehow, only by testing I can say that it does. Could anyone explain this to me please? EDIT: As Wiki says: Verification:Preparing of the test cases (based on the analysis of the requireemnts) Validation: Running of the test cases

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  • How do I deal with code of bad quality contributed by a third party?

    - by lindelof
    I've recently been promoted into managing one of our most important projects. Most of the code in this project has been written by a partner of ours, not by ourselves. The code in question is of very questionable quality. Code duplication, global variables, 6-page long functions, hungarian notation, you name it. And it's in C. I want to do something about this problem, but I have very little leverage on our partner, especially since the code, for all its problems, "just works, doesn't it?". To make things worse, we're now nearing the end of this project and must ship soon. Our partner has committed a certain number of person-hours to this project and will not put in more hours. I would very much appreciate any advice or pointers you could give me on how to deal with this situation.

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  • Common Javascript mistakes that severely affect performance?

    - by melee
    At a recent UI/UX MeetUp that I attended, I gave some feedback on a website that used Javascript (jQuery) for its interaction and UI - it was fairly simple animations and manipulation, but the performance on a decent computer was horrific. It actually reminded me of a lot of sites/programs that I've seen with the same issue, where certain actions just absolutely destroy performance. It is mostly in (or at least more noticeable in) situations where Javascript is almost serving as a Flash replacement. This is in stark contrast to some of the webapps that I have used that have far more Javascript and functionality but run very smoothly (COGNOS by IBM is one I can think of off the top of my head). I'd love to know some of the common issues that aren't considered when developing JS that will kill the performance of the site.

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  • Which Programming Languages Support the Following Features?

    - by donalbain
    My personal programming background is mainly in Java, with a little bit of Ruby, a tiny bit of Scheme, and most recently, due to some iOS development, Objective-C. In my move from Java to Objective-C I've really come to love some features that Objective-C has that Java doesn't. These include support for both static and dynamic typing, functional programming, and closures, which I'm trying to leverage in my code more often. Unfortunately there are trade-offs, including lack of support for generics and (on iOS at least) no garbage collection. These contrasts have lead me to start a search for some of the programming languages that support the following features: Object Oriented Functional Programming Support Closures Generics Support for both Static and Dynamic Typing Module Management to avoid classpath/dll hell Garbage Collection Available Decent IDE Support Admittedly some of these features(IDE support, Module Management) may not be specific to the language itself, but obviously influence the ease of development in the language. Which languages fit these criteria?

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  • Design: classes with same implementation but different method names

    - by Dror Helper
    I have multiple classes that have similar implementation for different named methods: class MyClassX { public int MyClassXIntMethod(){} public string MyClassXStringMethod(){} } class MyClassY { public int MyClassYIntMethod(){} public string MyClassYStringMethod(){} } the methods inside the classes have similar implementation but because the method's names are different (due to 3rd party constraints) i cannot use inheritance. I'm looking for an elegant solution that would be better than implementing the same functionality over and over again.

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  • How long was Microsoft working on .NET before they released it?

    - by Richard DesLonde
    With the whole CLI, CTS, CLS, etc., not only did they release a powerful platform/infrastructure, but they released all the specs that describe it etc. It supports potentially infinite myriad languages, platforms, etc. This seems like an insane amount of work, even for a behemoth like Microsoft - especially since it turns out they did a damn good job. How long were they working on this before releasing it (.NET 1.0)?

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  • Data migration - dangerous or essential?

    - by MRalwasser
    The software development department of my company is facing with the problem that data migrations are considered as potentially dangerous, especially for my managers. The background is that our customers are using a large amount of data with poor quality. The reasons for this is only partially related to our software quality, but rather to the history of the data: Most of them have been migrated from predecessor systems, some bugs caused (mostly business) inconsistencies in the data records or misentries by accident on the customer's side (which our software allowed by error). The most important counter-arguments from my managers are that faulty data may turn into even worse data, the data troubles may awake some managers at the customer and some processes on the customer's side may not work anymore because their processes somewhat adapted to our system. Personally, I consider data migrations as an integral part of the software development and that data migration can been seen to data what refactoring is to code. I think that data migration is an essential for creating software that evolves. Without it, we would have to create painful software which somewhat works around a bad data structure. I am asking you: What are your thoughts to data migration, especially for the real life cases and not only from a developer's perspecticve? Do you have any arguments against my managers opinions? How does your company deal with data migrations and the difficulties caused by them? Any other interesting thoughts which belongs to this topics?

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  • What are some cool git or .gitignore tricks & best practices? [closed]

    - by 01walid
    Git is just awesome and fast VCS, however, knowing better this tool will help you incredibly increase your productivity and save your time. Here we can try to make a collection of tips, tricks and useful links to better take advantage of git, this question can have some more sub-questions, I mean: what are some usefull commands that reverse or rectify commits/adding/removing mistakes? what are .gitignore & Global .gitignore best practices? especially with private/secure files that contains passwords, api keys, local config and so on ... .gitignore first or git add <files> first? what are the advantages/disadvantages of both being the first/last. links to blog post, articles, would be sufficient. I thought every sub-question is not worthy opening a whole post each alone, I think centralizing these tips in one question post would help many people.

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  • Tracking contributions from contributors not using git

    - by alex.jordan
    I have a central git repo located on a server. I have many contributors that are not tech savvy, do not have server access, and do not know anything about git. But they are able to contribute via the project's web side. Each of them logs on via a web browser and contributes to the project. I have set things up so that when they log on, each user's contributions are made into a cloned repo on the server that is specifically for that user. Periodically, I log on to the server, visit each of their repos, and do a git diff to make sure they haven't done anything bad. If all is well, I commit their changes and push them to the central repo. Of course I need to manually look at their changes so that I can add an appropriate commit message. But I would also like to track who made the changes. I am making the commit, and I (and the web server) are the only users that are actually writing anything to the server. I could track this in the commit messages. While this strikes me as wrong, if this is my only option, is there a way to make userx's cloned repo always include "userx: " before each commit message that I add, so that I do not have to remind myself which user's repo I am in? Or even better, is there an easy way for me to make the commit, but in such a way as I credit the user whose cloned repo I am in?

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  • Why does Clang/LLVM warn me about using default in a switch statement where all enumerated cases are covered?

    - by Thomas Catterall
    Consider the following enum and switch statement: typedef enum { MaskValueUno, MaskValueDos } testingMask; void myFunction(testingMask theMask) { switch theMask { case MaskValueUno: {}// deal with it case MaskValueDos: {}// deal with it default: {} //deal with an unexpected or uninitialized value } }; I'm an Objective-C programmer, but I've written this in pure C for a wider audience. Clang/LLVM 4.1 with -Weverything warns me at the default line: Default label in switch which covers all enumeration values Now, I can sort of see why this is there: in a perfect world, the only values entering in the argument theMask would be in the enum, so no default is necessary. But what if some hack comes along and throws an uninitialized int into my beautiful function? My function will be provided as a drop in library, and I have no control over what could go in there. Using default is a very neat way of handling this. Why do the LLVM gods deem this behaviour unworthy of their infernal device? Should I be preceding this by an if statement to check the argument?

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  • Is the copy/paste approach professionally viable when working with the Google Maps API?

    - by Ian Campbell
    I find that I understand much of the Javascript concepts used in the Google Maps API code, but then again there is quite a bit that is way over my head in syntax. For example, the geocoder syntax seems to be of Ajax form, though I don't understand what is happening under the hood (especially with lines like results[0].geometry.location). I am able to modify the body of if (status == google.maps.GeocoderStatus.OK) for different purposes though. So, being that I am able to take various code from the Developer's Guide and rework it to an extent for my own purposes, all the while not fully understanding what Google Maps is actually doing, does this make me a copy-paste programmer? Is this a bad practice, or is this professionally viable? I am, of course, interested in learning as much as I can, but what if time-constraints outweigh the learning process?

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  • Distributed Transaction Framework across webservices

    - by John Petrak
    I am designing a new system that has one central web service and several site web services which are spread across the country and some overseas. It has some data that must be identical on all sites. So my plan is to maintain that data in the central web service and then "sync" the data to sites. This includes inserts, edits and deletes. I see a problem when deleting, if one site has used the record, then I need to undo the delete that has happened on the other servers. This lead me to idea that I need some sort of transaction system that can work across different web servers. Before I design one from scratch, I would like to know if anyone has come across this sort of problem and if there are any frame works or even design patterns that might aid me?

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  • Avoiding Object Oriented Pitfalls, Migrating from C, What Worked for You?

    - by Stephen
    I've been programming in procedural languages for quite some time now, and my first reaction to a problem is to start breaking it down into tasks to perform rather than to consider the different entities (objects) that exist and their relationships. I have had a university course in OOP, and understand the fundamentals of encapsulation, data abstraction, polymorphism, modularity and inheritance. I read Learning to think in the Object Oriented Way and Learning object oriented thinking, and will be looking at some of the books pointed to in those answers. I think that several of my medium to large sized projects will benefit from effective use of OOP but as a novice I would like to avoid time consuming, common errors. Based on your experiences, what are these pitfalls and what are reasonable ways around them? If you could explain why they are pitfalls, and how your suggestion is effective in addressing the issue it'd be appreciated. I'm thinking along the lines of something like "Is it common to have a fair number of observer and modifier methods and use private variables or are there techniques for consolidating/reducing them?" I'm not worried about using C++ as a pure OO language, if there are good reasons to mix methods. (Reminiscent of the reasons to use GOTOs, albeit sparingly.) Thank you!

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