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• Ruby/IRB self help

  - by mozillalives

  I'm new to Ruby - what tricks can I use to help me find documentation on a object I'm working with? Normally I just do a_var.class or a_var.methods and try to guess what I need or search the web for documentation. Are there other methods or modules that might help?

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• Cleanest way to build an SQL string in Java

  - by Vidar

  I want to build an SQL string to do database manipulation (updates, deletes, inserts, selects, that sort of thing) - instead of the awful string concat method using millions of "+"'s and quotes which is unreadable at best - there must be a better way. I did think of using MessageFormat - but its supposed to be used for user messages, although I think it would do a reasonable job - but I guess there should be something more aligned to SQL type operations in the java sql libraries. Would Groovy be any good? Any help much appreciated.

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• Logging to multiple syslog servers - log4j

  - by Vizek

  Can I send logging information to multiple syslog servers? Our IT department has 2 syslog servers (for redundancy) and wants the application to log to both of them. Is adding 2 lines for syslog host going to work? I guess creating 2 separate syslog appenders (SYSLOG1, SYSLOG2) will work, but wanted to explore this path first.

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• How to get Java swing application to respect OS DPI settings

  - by drasto

  Is there a way to set DPI in swing ? For the whole application ? And if there is how do I set it to the value of system DPI ? I guess there must be a way to do it as I mentioned this feature must have benn added to NetBeans in some of latest versions... Thank you for reading

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• How much is the database being read from vs written to?

  - by Bill Paetzke

  I'd like to determine if my web app is read-heavy, write-heavy, or somewhere in between. I could take a guess, but I want proof. Is there a query I could run in Sql Server 2005 that would tell me the overall read/write ratio? Are there any caveats I should be aware of? Perhaps it can be found in a DMV query, or the Performance Dashboard, or examining a Sql Profiler trace. I'm not sure exactly how.

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• serial port in C

  - by user222820

  I have written a program in C to send a byte to serial port (com). I have used BIOSCOM to send data but I guess that it doesn't open the port. Please tell how I can open and close a com port in C. My code is here: #define COM1 1; bioscom (1 , 65 , COM1); Please help me...

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• php script which updates svn working directory

  - by Sourabh

  Hi I want to write a php script which updates svn working directory I tried with below code , but it does not work.I guess because the USER for php script is "apache" but for svn update it needs to be "homeuser" putenv("USERNAME=homeuser"); putenv("HOME=/home/homeuser"); exec("svn update /home/homeuser/path/to/working/dir", $info); //svn update with full path print_r($info); how to get around ?

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• Nice, clean, simple way of getting a dataset from ASP.NET to plain HTML jQuery or JavaScript library

  - by David S

  I know this is a probable open ended question, and I have tried looking around so much over the last year or two... maybe I am looking for a perfect place that doesn't exist! of course it's all about perception no less.. Anyway, just to clarify what I am trying to do and why: I want to be able to use (primarily for the moment) ASP.NET or services thereof to get a dataset - whatever the source data, I can obviously get a dataset of rows/Columns. I want to be able to, as simply as possible, get that data over to the client via xml/json/whatever, to then use in a "variety" of ways. "Variety" of ways meaning I would like to "easily" bind that data to say a grid, or a combo dropdown or just simply render to a textbox - BUT by referencing the dataset as I would say on the serverside. Now I know this all sounds simplistic, and I know there are lots of complications.. so I have tried the following so far over the last year or so: ExtJS - very good, nice solid framework, but just found it a bit too much to use in everyday basic apps - great if I was building a whole application with it Yahoo YUI - not looked recently, but I guess some of the concepts with ExtJS were similar? JQuery - of course to get data etc, it was ok, and I guess there are so many 3rd party plugins, that a mix and match might work? Adobe SPRY - ironically this was as close to getting a dataset style structure to Javascript/client, although it seemed to drop off/go quiet..? I maybe wrong.. I did have a very cursory play with Tibco GI and another one I cannot remember the name of! but again, it felt like it was great to build a whole app perhaps? Anyway, I am very amazed by all of the technologies coming out, and really not biased one way or the other, I really just want a very simple way of getting data from the server, and having a basic/very flexible way of working with that data in the client without using server technologies.. I need to keep the server flexible as I may need to use PHP, or java technologies not just .NET So again, sorry for the rambles, but if anyone out there has had a simple experience, or would like to share some ideas, it would be very welcomed!! David.

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• bash: expanding variables with spaces

  - by adam n

  i have a file called physics 1b.sh in bash, if i try x="physics 1b" grep "string" "$x".sh grep complains: grep: physics 1b: No such file or directory. However, when i do grep "string" physics\ 1b.sh it works fine. So i guess the problem is something to do with the variable not being expanded to include the backslash that grep needs to recognize the space. How do i get this to work? using bash 3.2, mac os 10.6.

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• SQLite long to wide formats?

  - by Stephen

  Hi, I wonder if there is a canonical way to convert data from long to wide format in SQLite (is that operation usually in the domain of relational databases?). I tried to follow this example for MySQL but I guess SQLite does not have the same IF construct... Thanks!

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• How to communicate between Client and Server in a Client-Server Application?

  - by Sanoj

  I would like to implement an Client-Server Application, where the business-logic, security validations and a database are at the server and the user interface are at the client. I would like to implement clients in different languages i.e. one in WPF/.NET, one Swing/Java , one in Android/Java and maybe one HTML/JavaScript client. The server will be on Internet, so I would like to be able to have encrypted communication. The client will send some lists of items to be added to the database, or update items, and do some transactions. The server will check if the items are already updated by another client, or update the item, add new items or delete items. How do I solve the communication between clients and the server in such a system? I have been thinking about: http/https webserver, and sending messages in JSON or XML and use Web Sockets for bi-directional communication. Use http in a RESTful way, except when WebSockets are needed. But I guess there are better solutions for native desktop applications than http? CORBA - I have just heard about it, and it's old and complex. Not much talk about it these days. XMPP/Jabber - I have just heard about it and I don't know if it fits me at all. EJabberd seams to be a popular implementation. AMQP - I have just heard about it and I don't know if it fits me at all. RabbitMQ seams to be a popular implementation. Windows Communication Foundation, Java RMI, Java Message Service - but are they language independent? I guess some of these alternatives are on different levels, maybe I can have i.e xmpp or amqp in web sockets over https? What technologys are used for this problem in companies today? and what is recommended to use? I have no experience of them other than webservers and http. Please give me some guidance in this jungle. What are the pros and cons of these technologies in my situation?

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• limit double at six decimal place in asp.net

  - by Tyzak

  hi, i have a double, the decimal place isn't fix (8-?) i want to fix the decimal place to six (for example: 1,234567). this is my double: CStr(score) i guess it's quiet simple :P

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• Why is the software world full of status codes?

  - by David V McKay

  Why did programmers ever start using status codes? I mean, I guess I could imagine this might be useful back in the days when a text string was an expensive resource. WAYYY back then. But even after we had megabytes of memory to work with, we continued to use them. What possible advantage could there be for obfuscating the meaning of an error message or status message behind a status code?

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• WPF: RadialGradientBrush without gradient?

  - by stefan.at.wpf

  Hello, I want to draw some circles in another circle like this: Is there a way to tell a RadialGradientBrush not to use gradients but just fixed colors, so I can achieve this? Thanks for any hint! (I guess this could be easily done using a DrawingBrush, I'm just wondering whether this could also be done using a RadialGradientBrush)

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• replace line with sed in csh

  - by not_a_geek

  Hello, I am trying to change the content of a specific line in a batch of files. I thought that would be a piece of cake but for some reason, nothing happens, so I guess I am missing something. Line 8 should have been replaced. Here the csh script I used: !/bin/csh # replace context in line xxx by yyy 2010/05/07 set files = ls FILENAMEPART* echo $files foreach file ($files) sed '8,8 s/1/2 /' $file end thanks for suggestions

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• Programming graphics and sound on PC - Total newbie questions, and lots of them!

  - by Russel

  Hello, This isn't exactly specifically a programming question (or is it?) but I was wondering: How are graphics and sound processed from code and output by the PC? My guess for graphics: There is some reserved memory space somewhere that holds exactly enough room for a frame of graphics output for your monitor. IE: 800 x 600, 24 bit color mode == 800x600x3 = ~1.4MB memory space Between each refresh, the program writes video data to this space. This action is completed before the monitor refresh. Assume a simple 2D game: the graphics data is stored in machine code as many bytes representing color values. Depending on what the program(s) being run instruct the PC, the processor reads the appropriate data and writes it to the memory space. When it is time for the monitor to refresh, it reads from each memory space byte-for-byte and activates hardware depending on those values for each color element of each pixel. All of this of course happens crazy-fast, and repeats x times a second, x being the monitor's refresh rate. I've simplified my own likely-incorrect explanation by avoiding talk of double buffering, etc Here are my questions: a) How close is the above guess (the three steps)? b) How could one incorporate graphics in pure C++ code? I assume the practical thing that everyone does is use a graphics library (SDL, OpenGL, etc), but, for example, how do these libraries accomplish what they do? Would manual inclusion of graphics in pure C++ code (say, a 2D spite) involve creating a two-dimensional array of bit values (or three dimensional to include multiple RGB values per pixel)? Is this how it would be done waaay back in the day? c) Also, continuing from above, do libraries such as SDL etc that use bitmaps actual just build the bitmap/etc files into machine code of the executable and use them as though they were build in the same matter mentioned in question b above? d) In my hypothetical step 3 above, is there any registers involved? Like, could you write some byte value to some register to output a single color of one byte on the screen? Or is it purely dedicated memory space (=RAM) + hardware interaction? e) Finally, how is all of this done for sound? (I have no idea :) )

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• WordPress Problem with wp_enqueue_script

  - by Zack

  I try to us wp_enqueue_script to load my javascript, here is my code: <?php wp_enqueue_script('slider','/wp-content/themes/less/js/slider.js',array('jquery'),'1.0'); ?> It's not working, when I look into the source, it turns to be: <script type='text/javascript' src='http://localhost/wp/wp-content/themes/less/js/slider.js?ver=2.9.2'></script> ?ver=2.9.2 is added to the end automatically, I guess this is the reason, how can I fix it.

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• Double Buffering for Game objects, what's a nice clean generic C++ way?

  - by Gary

  This is in C++. So, I'm starting from scratch writing a game engine for fun and learning from the ground up. One of the ideas I want to implement is to have game object state (a struct) be double-buffered. For instance, I can have subsystems updating the new game object data while a render thread is rendering from the old data by guaranteeing there is a consistent state stored within the game object (the data from last time). After rendering of old and updating of new is finished, I can swap buffers and do it again. Question is, what's a good forward-looking and generic OOP way to expose this to my classes while trying to hide implementation details as much as possible? Would like to know your thoughts and considerations. I was thinking operator overloading could be used, but how do I overload assign for a templated class's member within my buffer class? for instance, I think this is an example of what I want: doublebuffer<Vector3> data; data.x=5; //would write to the member x within the new buffer int a=data.x; //would read from the old buffer's x member data.x+=1; //I guess this shouldn't be allowed If this is possible, I could choose to enable or disable double-buffering structs without changing much code. This is what I was considering: template <class T> class doublebuffer{ T T1; T T2; T * current=T1; T * old=T2; public: doublebuffer(); ~doublebuffer(); void swap(); operator=()?... }; and a game object would be like this: struct MyObjectData{ int x; float afloat; } class MyObject: public Node { doublebuffer<MyObjectData> data; functions... } What I have right now is functions that return pointers to the old and new buffer, and I guess any classes that use them have to be aware of this. Is there a better way?

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• How to define a predicate as a function argument

  - by devoured elysium

  I want to be able to write something as void Start(some condition that might evaluate to either true or false) { //function will only really start if the predicate evaluates to true } I'd guess it must be something of the form: void Start(Predicate predicate) { } How can I check inside my Start function whenever the predicate evaluated to true or false? Is my use of a predicate correct? Thanks

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• Thread.CurrentThread.CurrentUICulture not working consistently

  - by xTRUMANx

  I've been working on a pet project on the weekends to learn more about C# and have encountered an odd problem when working with localization. To be more specific, the problem I have is with System.Threading.Thread.CurrentThread.CurrentUICulture. I've set up my app so that the user can quickly change the language of the app by clicking a menu item. The menu item in turn, saves the two-letter code for the language (e.g. "en", "fr", etc.) in a user setting called 'Language' and then restarts the application. Properties.Settings.Default.Language = "en"; Properties.Settings.Default.Save(); Application.Restart(); When the application is started up, the first line of code in the Form's constructor (even before InitializeComponent()) fetches the Language string from the settings and sets the CurrentUICulture like so: public Form1() { Thread.CurrentThread.CurrentUICulture = new CultureInfo(Properties.Settings.Default.Language); InitializeComponent(); } The thing is, this doesn't work consistently. Sometimes, all works well and the application loads the correct language based on the string saved in the settings file. Other times, it doesn't, and the language remains the same after the application is restarted. At first I thought that I didn't save the language before restarting the application but that is definitely not the case. When the correct language fails to load, if I were to close the application and run it again, the correct language would come up correctly. So this implies that the Language string has been saved but the CurrentUICulture assignment in my form constructor is having no effect sometimes. Any help? Is there something I'm missing of how threading works in C#? This could be machine-specific, so if it makes any difference I'm using Pentium Dual-Core CPU. UPDATE Vlad asked me to check what the CurrentThread's CurrentUICulture is. So I added a MessageBox on my constructor to tell me what the CurrentUICulture two-letter code is as well as the value of my Language user string. MessageBox.Show(string.Format("Current Language: {0}\nCurrent UI Culture: {1}", Properties.Settings.Default.Language, Thread.CurrentThread.CurrentUICulture.TwoLetterISOLanguageName)); When the wrong language is loaded, both the Language string and CurrentUICulture have the wrong language. So I guess the CurrentUICulture has been cleared and my problem is actually with the Language Setting. So I guess the problem is that my application sometimes loads the previously saved language string rather than the last saved language string. If the app is restarted, it will then load the actual saved language string.

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• Performance of a proposed JEE architecture

  - by kineas

  I have concerns about the performance of the following architecture: j2ee application in an appserver, ejb session bean and DAOs remote (rich) client, a swing app. A classic, form-based client only one stateless ejb, the ejb is accessed via web services, not rmi, through a homegrown framework each web service request will get authenticated against an LDAP no state stored on the server, only client-side sessions I guess working on the rich GUI will involve a remote call in every 2-10 seconds, or more, per user. What do you think?

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• Read a local file

  - by user246114

  Hi, Is there no way for javascript hosted on a webserver to read a file on a client's local machine? (this has obvious security risks). I guess I'm wondering if there's any access granting a user can do, like drag and dropping a file into the browser, or explicitly selecting a file from a popup to get around this? I know flash 10 allows reading of a local file, just wondering if there were any method to do this in javascript. Thanks

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• Does URL Shortening affect Page Ranking?

  - by rc

  Recently there has been a lot of hype about URL Shortening. I guess some URL Shortening services even offer tracking stats. But, doesn't adding one more level of look-up to the original URL affect page ranking in any way? Just curious to know.

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• When using jQuery's getScript() function I get a "not well-formed" error on a line with comments

  - by codeninja

  My guess is that the src file needs to be XML-friendly, but of course none of the JS file is since it's using all sorts of non-XML compliant entities. getScript() may be expecting an XML file =/ Any thoughts? if(is_def(pObj)){ $.getScript(pObj.src,function(){ pObj.stat = STATUS_OK; $a.dequeue(pObj); }); }

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• Use URL Fetch of Google App Engine just to call a php script.

  - by Jagira

  Hello, I wanto call a PHP script using Google App Engine. I just want to execute the script. The script updates a couple of databases on my webhost. But I guess Google App waits for the response. Is there a way by which I can start the script. The script takes some time and Google App might die during that time.

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