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  • Pattern for database-wrapper in java

    - by Space_C0wb0y
    I am currently writing a java-class that wraps an SQLite database. This class has two ways to be instantiated: Open an existing database. Create a new database. This is what I cam up with: public class SQLiteDatabaseWrapper { public static SQLiteDatabaseWrapper openExisting(File PathToDB) { return new SQLiteDatabaseWrapper(PathToDB); } public static SQLiteDatabaseWrapper createNew(File PathToDB) { CreateAndInitializeNewDatabase(PathToDB); return new SQLiteDatabaseWrapper(PathToDB); } private SQLiteDatabaseWrapper(File PathToDB) { // Open connection and setup wrapper } } Is this the way to go in Java, or is there any other best practice for this situation?

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  • C# 2D Vector Graphics Game using DirectX or OpenGL?

    - by Brian
    Hey Guys, So it has been a while since I have done any game programming in C#, but I have had a recent bug to get back into it, and I wanted some opinions on what configuration I should use. I wanted to use C# as that is what I use for work, and have become vary familiar with. I have worked with both DirectX and OpenGL in the past, but mostly in 3D, but now I am interested in writing a 2D game with all vector graphics, something that resembles the look of Geometry Wars or the old Star Wars arcade game. Key points I am interested in: • Ease of use/implementation. • Easy on memory. (I plan on having a lot going on at once) • Looks good, I don't want curve to look pixelated. • Maybe some nice effects like glow or particle. I am open to any and all suggestions, maybe even something I have not thought of... Thanks in advance!

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  • Fork to shell script and terminate original process with Haskell

    - by Neth
    I am currently writing a Haskell program that does some initialization work and then calls ncmpcpp. What I am trying to do is start ncmpcpp and terminate the Haskell program, so that only ncmpcpp is left (optionally, the program can keep running in the background, as long as it's unintrusive) However, even though I am able to start ncmpcpp, I cannot interact with it. I see its output, but input appears to be impossible. What I am currently doing is: import System.Process (createProcess, proc) ... spawnCurses :: [String] -> IO () spawnCurses params = do _ <- createProcess (proc "ncmpcpp" params) return () What am I doing wrong/What should I do differently?

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  • Why the compiler doesn't complain about this error ?

    - by M.H
    Hi I am writing some java questions to help my friends in the java exam. I wrote a question and I supposed that three errors will occurred in the code but the compiler complained only about two. the code is : class MyClass { static MyClass() { System.out.println("I am The First Statement here!"); this(); } } I expected the following errors : the constructor can't be static this can't be in a static function (since the constructor isn't valid) this here should be the first statement. NetBeans isn't complaining about the second error here. why ?

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  • How to communicate with Telecom infrastructure using .NET

    - by Raiford
    I am currently writing some pretty gnarly C#/C++/Cli code to interface with Telecommunication equipement and GSM Mobile Networks for a couple of the major telecom here and abroad. GSM networks primarily use SS7 Signaling using a protocol called TCAP to send messages back and forth to Signaling Points within the network. The laws of Tcp/ip do not apply here :) I am very interested in hearing from others in this space specifically individuals using the .NET framework most likely using C# / C++. I have not come across any .NET libraries or tools to assist in this sort of development. Most of the software in this industry is "C" / Java based, as a result I have written tons of infrastructure .NET code using C# where possible and C++ / CLI to interface with hardware. Is anyone aware of any .NET language tools for this niche industry?

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  • Embedded Lua on iPhone. What's new and what does it mean?

    - by John Smith
    Apparently Apple has changed some term in the agreement again. From http://www.appleoutsider.com/2010/06/10/hello-lua/ section 3.3.2 is now Unless otherwise approved by Apple in writing, no interpreted code may be downloaded or used in an Application except for code that is interpreted and run by Apple’s Documented APIs and built-in interpreter(s). Notwithstanding the foregoing, with Apple’s prior written consent, an Application may use embedded interpreted code in a limited way if such use is solely for providing minor features or functionality that are consistent with the intended and advertised purpose of the Application. instead of the original No interpreted code may be downloaded or used in an Application except for code that is interpreted and run by Apple’s Documented APIs and built-in interpreter(s). I am more interested in embedding Lua, but other people have other embeddings they want to make. I am wondering how you ask for permission, and what they mean by the terms "minor features" and "consistent" and how will Apple interpret this section? It seems to have enough loopholes to drive a real firetruck through.

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  • how to debug a query that has valid syntax, executes, but returns no results?

    - by Ty W
    So I'm writing a fairly involved query with a half dozen joins, a dependent subquery for [greatest-n-per-group] purposes, grouping, etc. It is syntactically valid, but I've clearly made at least one mistake because it returns nothing. In the past I've debugged valid queries that return nothing by removing joins, executing subqueries on their own, removing WHERE conditions, and removing grouping to see what I would get but so far this one has me stumped. Are there better tools or techniques to use for this sort of thing? This particular query is for MySQL if it matters for any platform-specific tools.

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  • Why isn't this simple program working?

    - by user1445478
    I'm writing a very basic program that aims for the text view to display the phrase "Hello" after a button is pressed on the screen. However, I can't get this program to work; every time I run it, it says that the application has stopped unexpectedly. This is the program I wrote: public class EtudeActivityActivity extends Activity{ TextView tvResponse; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); final TextView tvResponse = (TextView) findViewById (R.id.tvResponse); } public void updateTV(View v) { tvResponse.setText("Hello"); } } Also, I inserted an android:onClick = "updateTV" into my main.xml file for the button. Thanks for any help!

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  • wxPython ,Change the background colour of a StyledTextCtrl

    - by user1357159
    I tried (but nothing happens) self.txt.SetBackgroundColour ((255,0,0)) As said in the title I'm trying to change the background colour StyledTextCtrl. Does anyone know a method that could be used? I've checked the API docs but I couldn't seem to find one, http://wxpython.org/docs/api/wx.stc.StyledTextCtrl-class.html (by background colour, I mean the whole writing area, of course) Does anyone know a way I could do this? EDIT: The background doesn't change in the following code import wx import wx.stc app = wx.App(redirect=True) top = wx.Frame(None, title="StyledTXTCtrl", size=(300,200)) txt=wx.stc.StyledTextCtrl(top) txt.SetBackgroundColour((255,255,0)) txt.Refresh() top.Show() app.MainLoop()

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  • How to delay shutdown of an application when user logs off or shuts down Windows?

    - by badpanda
    I am writing an application that runs in the background from startup to shutdown, and in some circumstances I need the application to display a dialogue for the user to choose whether or not to continue shutting down. This application will only be running on Windows, but may be running on any version from 2000 onward. While I have certainly done some research on the topic, the information regarding the way that windows handles application shut down (http://msdn.microsoft.com/en-us/library/ms700677(VS.85).aspx) seems to be a bit scattered. If anyone has an example of the best way to handle this, or additional knowledge regarding the topic, I would very much appreciate it (I have very little experience with C#). Thanks!! badPanda

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  • Reading a part of a alpha numeric string in SQL

    - by novice
    I have a table with one column " otname " table1.otname contains multiple rows of alpha-numeric string resembling the following data sample: 11.10.32.12.U.A.F.3.2.21.249.1 2001.1.1003.8281.A.LE.P.P 2010.1.1003.8261.A.LE.B.B I want to read the fourth number in every string ( part of the string in bold ) and write a query in Oracle 10g to read its description stored in another table. My dilemma is writing the first part of the query.i.e. choosing the fourth number of every string in a table My second query will be something like this: select description_text from table2 where sncode = 8281 -- fourth part of the data sample in every string Many thanks. novice

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  • C++: How to use types that have not been defined?

    - by Jen
    C++ requires all types to be defined before they can be used, which makes it important to include header files in the right order. Fine. But what about my situation: Bunny.h: class Bunny { ... private: Reference<Bunny> parent; } The compiler complains, because technically Bunny has not been completely defined at the point where I use it in its own class definition. This is not sufficient: class Bunny; class Bunny { ... private: Reference<Bunny> parent; } Apart from re-writing my template class Reference so it takes a pointer type (in which case I can use the forward declaration of Bunny), I don't know how to solve this. Any suggestions?

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  • Is there a way to localize input type="date" in HTML5

    - by lambacck
    I know that at the time of this writing only Opera supports a browser UI for <input type="date" name="mydate"> and maybe my attempts to localize this field have been met with frustration because niceties like localization have not yet been included in their implementation, but I don't even see mention of it in the HTML5 spec. Is there a way that localization should be specified? Should I do lang="fr" on a parent element? Some notes on the implementation of the site in question: Localization (language) is explicitly picked by the user because they are managing data in multiple languages and it is not reasonable to expect that the user's browser chrome is in the language being viewed or that the browser is providing desired language request headers. I want to be sure that if the page is rendered in French that the date picker provided by browser chrome shows options that make sense for French language. The plan is to fall back to jQueryUI for browsers that do not support type="date", I will use the detection mechanism provided in Dive into HTML 5

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  • NHibernate Many-to-many with a boolean flag on the association table

    - by Nigel
    Hi I am doing some work on an application that uses an existing schema that cannot be altered. Whilst writing my NHibernate mappings I encountered a strange many-to-many relationship. The relationship is defined in the standard way as in this question with the addition of a boolean flag on the association table that signifies if the relationship is legal. This seems somewhat redundant but as I say, cannot be changed. Is it possible to define this relationship in Nhibernate without resorting to using a third class to represent the association? Perhaps by applying a filter? Many thanks.

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  • Getting Database Data to the client side.

    - by Toby Allen
    I'm sure this has been asked a million times, but what is the accepted approach to this? I have been writing php code for a while and up until recently I only copied+pasted javascript code, but now with help from YUI I've begun to understand javascript and want to use it more in an existing web app I have. I want to get various amounts of data from databases etc to the clientside javascript. I have access to this data in my php pages when loading. What is the correct way to get this data to my client side script. Generate clientside javascript in my php or smarty template files inserting the data where I need it? Use an Ajax call to retrieve the information I need from a php file - returning JSON data? Generate a JSON data construct of the data needed by the page and either return it via a script inclusion or dumping it to the generated page? Something really obvious I haven't thought of.

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  • How to Call methods I see in a wsdl file someone linked me to?

    - by Derek
    Hi all, I am not a Java programmer by trade. C and Fortran mostly. However, I have this one-off project someone wants done. Connect to some web-based database and retrieve some data from it. I asked around, and someone finally linked me to a WSDL page. I click on this link, and I see a huge XML looking file. If I am writing a stand-alone java application, how do I go about calling these (promising looking) method names that I see in the wsdl. You know "getCoordinates" is there, but i have no idea how to call that method. After googling, I am finding a lot of different ways, and I am not sure what is the best way for my simple application. Thanks

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  • How to get function's name from function's pointer in C?

    - by Daniel Silveira
    How to get function's name from function's pointer in C? Edit: The real case is: I'm writing a linux kernel module and I'm calling kernel functions. Some of these functions are pointers and I want to inspect the code of that function in the kernel source. But I don't know which function it is pointing to. I thought it could be done because, when the system fails (kernel panic) it prints out in the screen the current callstack with function's names. But, I guess I was wrong... am I?

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  • How much memory is reserved when i declare a string?

    - by Bhagya
    What exactly happens, in terms of memory, when i declare something like: char arr[4]; How many bytes are reserved for arr? How is null string accommodated when I 'strcpy' a string of length 4 in arr? I was writing a socket program, and when I tried to suffix NULL at arr[4] (i.e. the 5th memory location), I ended up replacing the values of some other variables of the program (overflow) and got into a big time mess. Any descriptions of how compilers (gcc is what I used) manage memory?

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  • Javascript to sort contents of select element

    - by Jangwenyi
    Hi, is there a quick way to sort the items of a select element? Or I have to resort to writing javascript? Please any ideas. <select size="4" name="lstALL" multiple="multiple" id="lstALL" tabindex="12" style="font-size:XX-Small;height:95%;width:100%;"> <option value="0"> XXX</option> <option value="1203">ABC</option> <option value="1013">MMM</option> </select>

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  • Finding the next record in the database with Active Record

    - by ericraio
    So I have my rails application and I have blog posts in my application. For starters I am on rails 2.3.5 and Ruby 1.8.7 For the show page, I am required to give a prev/next link to the prev/next blog post. The catch is that I need to find the next blog where the language column in the database is equal to 'eng'. I had started writing this out in my model and it works but of course this will just find the prev/next record in the database no matter what the language is specified in the column and it will break when the record is not found. def next(lang='eng') BlogEntry.find(self.id - 1) end def prev(lang='eng') BlogEntry.find(self.id + 1) end

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  • A good F# codebase to learn from

    - by Lucas
    Hi all, I've been teaching myself F# for a while now. I've read Programming F# by Chris Smith (great book) and I've written a few small scripts for getting the job done here and there. But IMO the best way to learn a new programming language—and more importantly, the idioms that come with it—is to read a good open source codebase written in that language. Naturally, writing code in that language is crucial, but in the beginning, you're basically struggling with your own ignorance about how things should be done. You could perform certain tasks one way or the other, but it takes experience to realize the flaws and virtues of each. Even after you've gotten a firm grasp of how things work, reading the code of people who have an even firmer one helps a great deal. Most would agree that the most insightful parts of any learn-a-programming-language book are the code examples, and reading a well-written open source codebase is the next level of that. So are there any out there for F#?

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  • Best way to do TDD in express versions of visual studio(eg VB Express)

    - by Nathan W
    I have been looking in to doing some test driven development for one of the applications that I'm currently writing(OLE wrapper for an OLE object). The only problem is that I am using the express versions of Visual Studio(for now), at the moment I am using VB express but sometimes I use C# express. Is it possible to do TDD in the express versions? If so what are the bast was to go about it? Cheers. EDIT. By the looks of things I will have to buy the full visual studio so that I can do integrated TDD, hopefully there is money in the budget to buy a copy :). For now I think I will use Nunit like everyone is saying.

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  • Should downcasting be avoided while using a class hierarchy in C++?

    - by neuviemeporte
    Let's say I'm writing an application which works with projects, and exposes different functionality depending on the type of the project. I have a hierarchy of classes for the different types of projects: class AbstractProject { }; class ProjectA : public AbstractProject { }; class ProjectB : public AbstractProject { }; class ProjectC : public AbstractProject { }; Now, I was planning to have an AbstractProject *_currentProject pointer as a member in the application's main class, pop up a dialog box on startup and based on the selection, do: _currentProject = new ProjectB(); // e.g. Later, I'll have to downcast the pointer to the specific type to utilize the functionality specific to different Project-s. Somehow this makes me feel uneasy. Is there a Better Way of doing this?

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  • natural sort of text and numbers, JavaScript

    - by ptrn
    I'm looking for the easiest way to sort an array that consists of numbers and text, and a combination of these. E.g. '123asd' '19asd' '12345asd' 'asd123' 'asd12' turns into '19asd' '123asd' '12345asd' 'asd12' 'asd123' This is going to be used in combination with the solution to another question I've asked here. The sorting function in itself works, what I need is a function that can say that that '19asd' is smaller than '123asd'. I'm writing this in JavaScript. Edit: as adormitu pointed out, what I'm looking for is a function for natural sorting

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  • How do I convert an arbitrary list of strings to a SQL rowset?

    - by Jim Kiley
    I have a simple list of strings, which may be of arbitrary length. I'd like to be able to use this list of strings as I would use a rowset. The app in question is running against SQL Server. To be clearer, if I do SELECT 'foo', 'bar', 'baz' I get 'foo', 'bar', and 'baz' as fields in a single row. I'd like to see each one of them as a separate row. Is there a SQL (or SQLServer-specific) function or technique that I'm missing, or am I going to have to resort to writing a function in an external scripting language?

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