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• Looking for PCA snippet/source code in C++

  - by jihchuan

  Hi, I'm currently developing a software to compare 2 images. I start with extract the image's RGB values, form a matrix of array and then attempt to compress the values using PCA, and then match/recognize it with a pre-set data to find its similarity. But I can't proceed with the PCA part. (I'm using C++, C also can) If there any library/source code/snippet for it please let me know, or if there're any recommendation on my case also very welcomed!! I'd appreciate your helps!! Thanks! JC, [email protected]

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• How to impose control access on flash player streaming through RTMP?

  - by MobiHunterz

  Hi, I'm using ICECAST and I'm streaming AAC/HE-AACv2 audio/video file through flash player and on iPhone. Both are separate. But when I submit url in WINAMP to stream it's requesting username/password. But when I use it with flash player, it just starts streaming. My case is I want to use same streaming (RTMP) for both website and iPhone app and i want to impose control access over my flash player to authenticate who can see streamed video. So, I need to allow access to authenticated users only to see flash player or just reject playing. Now, my provider is not supporting control access on flash player, but i need to do it... can u say how i can do this? Any kind of help will be appreciated. Thanks.

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• Centralized Credentials Service For Various Apps

  - by Vlad

  We are researching the possibility to build a centralized credentials storage for internal applications. These apps (vb6, vb.net, web apps in asp.net, etc) are using various instances of SQL servers and iSeries. We want to implement a central credentials facility that would act as a security broker. Basically it should work like this: Client app supplies AppID (I am Sales Application) and EnvironmentID (I am running in QA environment) and in return will get either a connection object (preferred) or encrypted connection string that will allow said application to connect to resources it needs. There will be cases when application needs to connect to two (or more) database resources (i.e. to SQL and iSeries). What are looking at DP API at the moment, but I am not convinced that DP API is the solution as it tied in with machine key. In our case using machine key isn't feasible, so I want to know if there are other approaches available.

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• Books recommendation to learn about java networking

  - by elec

  In order to cover for my (glaring) lack of knowledge in the basics of networking, I'm looking for a book which would ideally cover: - 1 or 2 chapters on the transport layer: tcp, udp... - 1 or 2 chapters on the application layer: http, dns... - rest of the book would be devoted to pratical way of sending data across the wire using Java-related technologies. This would involve discussions about existing products (eg. hessian, protobuf, thrift, tibco...) , performances comparisons, case studies...etc.. Does such a book exist ?

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• How to deal with symbolic links when going between Linux and Windows?

  - by Jesse Beder

  I have a django project that runs on a Linux server, and I've been working on it both on Linux and OS X. I've noticed that some of the pages are a bit off, to put it politely, in Internet Explorer, and so I checked out the subversion repository on Windows and tried to run a local server. My media directory has symbolic links to all of the media from each different app, and obviously Windows doesn't know what to do with them. I could simply hard-copy or link everything manually in Windows, but then I wouldn't be able to check that in (since the site runs on a Linux server), so it'd be a pain in the neck. What is typically done in this case?

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• ruby-gstreamer doesn't send EOS message

  - by Cheba

  I've managed to make it play sound but it never gets EOS message. And thus script never exits. require 'gst' main_loop = GLib::MainLoop.new pipeline = Gst::Pipeline.new "audio-player" source = Gst::ElementFactory.make "filesrc", "file-source" source.location = "/usr/share/sounds/gnome/default/alerts/bark.ogg" decoder = Gst::ElementFactory.make "decodebin", "decoder" conv = Gst::ElementFactory.make "audioconvert", "converter" sink = Gst::ElementFactory.make "alsasink", "output" pipeline.add source, decoder, conv, sink source >> decoder conv >> sink decoder.signal_connect "pad-added" do |element, pad, data| pad >> conv['sink'] end pipeline.bus.add_watch do |bus, message| puts "Message: #{message.inspect}" case message.type when Gst::Message::Type::ERROR puts message.structure["debug"] main_loop.quit when Gst::Message::Type::EOS puts 'End of stream' main_loop.quit end end pipeline.play begin puts 'Running main loop' main_loop.run ensure puts 'Shutting down main loop' pipeline.stop end

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• When is referential integrity not appropriate?

  - by Curtis Inderwiesche

  I understand the need to have referential integrity for limiting specific values on entry or possibly preventing them from removal upon a request of deletion. However, I am unclear as to a valid use case which would exclude this mechanism from always being used. I guess this would fall into several sub-questions: When is referential integrity not appropriate? Is it appropriate to have fields containing multiple and/or possibly incomplete subsets of a foreign key's list? Typically, should this be a schema structure design decision or an interface design decision? (Or possibly neither or both) Thoughts?

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• Flash AS3 Coloring Book - Movieclip only clickable in certain spots (Event Listeners)

  - by kilrizzy

  I am working on a coloring book and have a movieclip (outlines) containing many movieclips that can be changed to whatever color the user has selected. However it seems like some of the movieclips can be clicked anywhere and work great, and others you need to click a certain spot for it to color in. I have an example here: http://jeffkilroy.com/hosted/softee/coloring.html Notice the three sections of the icecream (top, middle, bottom). The middle is clickable from anywhere inside the movieclip, however the top and especially bottom require you to click on specific spots in order for you to activate the event listener. Not sure if it is a depth issue because I would assume if that is the case it would activate at least a different movieclip but it just seems nothing happens at all. Any help would be appreciated, I also have the source located here: Source CS4 Source CS3

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• Is Matlab faster than Python?

  - by kame

  I want to compute magnetic fields of some conductors using the biot-savart-law and I want to use a 1000x1000x1000 matrix. Before I use Matlab, but now I want to use Python. Is Python slower than Matlab? How can I make Python faster? EDIT: Maybe the best way is to compute the big array with c/c++ and then transfering them to python. I want to visualise then with VPython. EDIT2: Could somebody give an advice for which is better in my case: C or C++?

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• retrieving background image from div when dynamically set

  - by tixrus

  I am having an issue with setting the background-image of a #x to the background image of #y. Correct me if I am wrong but I think you would do this in a simple case by saying $('#x').css('background-image',$('#y').css('background-image')); The problem is that when y was initially set up, it was set up like this: <div id='y' style='background-image: url(./randomcolor.php?ibase=<?php echo $entity->name; ?>) .... So when it does it, it is getting the URL of the generator, and javascript is just regarding that as a string. Do I have to do an ajax get here, or is there some kind of eval I could use.

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• Returning a JSON view in combination with a boolean

  - by Rody van Sambeek

  What i would like to accomplish is that a partiel view contains a form. This form is posted using JQuery $.post. After a successfull post javascript picks up the result and uses JQuery's html() method to fill a container with the result. However now I don't want to return the Partial View, but a JSON object containing that partial view and some other object (Success - bool in this case). I tried it with the following code: [AcceptVerbs(HttpVerbs.Post)] public ActionResult Edit(int id, Item item) { if (ModelState.IsValid) { try { // ... return Json(new { Success = true, PartialView = PartialView("Edit", item) }); } catch(Exception ex) { // ... } } return Json(new { Success = false, PartialView = PartialView("Edit", item) }); } However I don't get the HTML in this JSON object and can't use html() to show the result. I tried using this method to render the partial as Html and send that. However this fails on the RenderControl(tw) method with a: The method or operation is not implemented.

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• Will an Nginx as reverse proxy for Apache help on dynamic content only

  - by Saif Bechan

  I am planning to move all my static content to a CDN so on my server I only have dynamic content left. I now have Nginx set up as reverse proxy to Apache. The static request that came in where directly delivered by Nginx without having to go to Apache. In this case Nginx handled a large portion of the request and I can clearly see the necessity of Nginx. Now that I moved all the static content to another domain, is there still a need to have nginx in front of Apache. Because now all the request are by default dynamic requests and all go to Apache. Are there any other benefits of having Nginx and Apache running for only dynamic content. My dynamic content is PHP/MySQL Edit: To be clear: I now have Nginx as a reverse proxy. It delivers static and dynamic content. But I am moving my static files to a CDN. Do I then still need Nginx on my domain.

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• py.test import context problems (causes Django unit test failure)

  - by dhill

  I made a following test: # main.py import imported print imported.f.__module__ # imported.py def f(): pass # test_imported.py (py.test test case) import imported def test_imported(): result = imported.f.__module__ assert result == 'imported' Running python main.py, gives me imported, but running py.test gives me error and result value is moduletest.imported (moduletest is the name of the directory I keep the test in. It doesn't contain __init__.py, moduletest is the only directory containing *.py files in ~/tmp). How can I fix result value? The long story: I'm getting strange errors, while testing Django application. A call to reverse() from (django.urlresolvers). with function object foo as argument in tests crashes with NoReverseMatch: Reverse for 'site.app.views.foo'. The same call inside application works. I checked and it is converted to 'app.views.foo' (without site prefix). I first suspected my customised test setup for Django, but then I made above test.

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• How does the Garbage Collector decide when to kill objects held by WeakReferences?

  - by Kennet Belenky

  I have an object, which I believe is held only by a WeakReference. I've traced its reference holders using SOS and SOSEX, and both confirm that this is the case (I'm not an SOS expert, so I could be wrong on this point). The standard explanation of WeakReferences is that the GC ignores them when doing its sweeps. Nonetheless, my object survives an invocation to GC.Collect(GC.MaxGeneration, GCCollectionMode.Forced). Is it possible for an object that is only referenced with a WeakReference to survive that collection? Is there an even more thorough collection that I can force? Or, should I re-visit my belief that the only references to the object are weak?

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• Is it possible to use IPC inside of a IE8 Browser Helper Object?

  - by Joel

  I need to communicate with a Service using IPC from inside of a Browser Helper Object (registered with IE8). Unfortunately, all of this communication is done through an Assembly API that I have no control over. Whenever this API starts up I get the following error: ExceptionSystem.Runtime.Remoting.RemotingException: Failed to connect to an IPC Port: The system cannot find the file specified. I realize that it is difficult to discern what the issue is without source. However I am curious if anyone knows of anything sort of permissions or DLL issues that would prevent IPC from working in this case.

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• How do I migrate a ManyToOne to a ManyToMany relationship in Hibernate?

  - by spderosso

  I have a instance field of a class X that is mapped using Hibernate as a Many to One relationship. E.g: public class X{ ... @ManyToOne(optional=false) private Y iField; ... } That is correctly working with a particular schema. I know want to change this instance field iField to a List and a Many to Many relationship. public class X{ ... @ManyToMany(optional=false) private List<Y> iField; ... } What steps should I follow? Do I have to change the schema? in which way? In case you need more info let me know. Thanks!

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• How to use Fluent style syntactic sugar with c# property declaration

  - by Thomas

  i never use fluent style code before. so first time i tried to develop Fluent style with c# property declaration but getting error. can any one help me. public class MailTemplate { string _MailBody = ""; public MailTemplate MailBody { get { return _MailBody; } set { _MailBody = value ; } } string _Subject = ""; public MailTemplate Subject { get { return _Subject; } set { _Subject = value; } } string _MailFrom = ""; public MailTemplate MailFrom { get { return _MailFrom; } set { _MailFrom = value; } } } please help me how could assign or initialize mail body and later also can read with same property name. i think proeprty can not be use in case of fluent style development. need some light here. thanks

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• PHP reading 'get' veriable that may or may not have been set

  - by thecoshman

  Simply put, if you try to read the value of a get variable, what happens if said variable had not be put into the URL. Example: you request the page test.php, in that file it tries to read the value of $_GET['message']. What happens in this case? dose the value just get returned as ''? Dose this mean, that if I am always expecting a value to be entered, and am not willing to accept a value of '' that I can just do something like $foo = $_GET['bar']; if($foo == ''){ // Handle my 'error' } else { // $foo should now have a value that I can work with } Please bare in mind I know that I could use isset($_GET['bar']) But I don't just want to know if it is set, I don't care if it is or not, I just care if it has a value that is more then just an empty string.

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• Classes missing if application runs for a long time

  - by Rogach

  I have a funny problem - if my application runs for a long time ( 20h), then sometimes I get NoClassDefFound error - seems like JVM decided that the class is not going to be used anyway and GCd it. To be a bit more specific, here's an example case: object ErrorHandler extends PartialFunction[Throwable,Unit] { def isDefinedAt(t: Throwable) = true def apply(e: Throwable) =e match { // ... handle errors } } // somewhere else in the code... try { // ... long running code, can take more than 20 hours to complete } catch (ErrorHandler) And I get the following exception: Exception in thread "main" java.lang.NoClassDefFoundError: org/rogach/avalanche/ErrorHandler$ If that try/catch block runs for smaller amounts of time, everything works as expected. If anyone is interested, here is the codebase in question: Avalanche I need to note that I saw this and similar problems only on Cent OS 5 machines, using JRE 6u26 and Scala 2.9.1 / 2.9.2. What could be the cause of this problem?

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• Force VSProps settings to override project settings

  - by Steve

  I have a vsprops file that defines the optimizations all of our projects should be built with for Visual Studio 2008. If I set the properties for the project to "inherit from parent of project defaults" it works, and fills them in the vcproj file. However, this doesn't protect me from a developer checking in a project file that changes the optimizations. In this case, the project settings are used over the vsprops settings. I need to make it so that vsprops always takes precedence over what is in the vcproj file. Is this possible? Other workarounds are also welcome.

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• Metatool for automatic xml code generation

  - by iceman

  I want to develop a programming tool for developers which can do automatic xml code generation for specifying a GUI design and its controls. The aim is to allow non-programmers specify GUI controls(which in this case perform higher level task unlike WinForms ) from a GUI. So the xml code generated is essentially an internal representation which programmers can understand and further use in any automatic GUI generator. So the workflow is GUI(non-programmers)-xml(for programmers)-GUI(non-programmers). Is there a Microsoft project similar to this?

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• Embedding generic sql queries into c# program

  - by Pooja Balkundi

  Okay referring to my first question code in the main, I want the user to enter employee name at runtime and then i take this name which user has entered and compare it with the e_name of my emp table , if it exists i want to display all information of that employee , how can I achieve this ? using System; using System.Collections.Generic; using System.Linq; using System.Windows.Forms; using MySql.Data.MySqlClient; namespace ConnectCsharppToMySQL { public class DBConnect { private MySqlConnection connection; private string server; private string database; private string uid; private string password; string name; //Constructor public DBConnect() { Initialize(); } //Initialize values private void Initialize() { server = "localhost"; database = "test"; uid = "root"; password = ""; string connectionString; connectionString = "SERVER=" + server + ";" + "DATABASE=" + database + ";" + "UID=" + uid + ";" + "PASSWORD=" + password + ";"; connection = new MySqlConnection(connectionString); } //open connection to database private bool OpenConnection() { try { connection.Open(); return true; } catch (MySqlException ex) { //When handling errors, you can your application's response based //on the error number. //The two most common error numbers when connecting are as follows: //0: Cannot connect to server. //1045: Invalid user name and/or password. switch (ex.Number) { case 0: MessageBox.Show("Cannot connect to server. Contact administrator"); break; case 1045: MessageBox.Show("Invalid username/password, please try again"); break; } return false; } } //Close connection private bool CloseConnection() { try { connection.Close(); return true; } catch (MySqlException ex) { MessageBox.Show(ex.Message); return false; } } //Insert statement public void Insert() { string query = "INSERT INTO emp (e_name, age) VALUES('Pooja R', '21')"; //open connection if (this.OpenConnection() == true) { //create command and assign the query and connection from the constructor MySqlCommand cmd = new MySqlCommand(query, connection); //Execute command cmd.ExecuteNonQuery(); //close connection this.CloseConnection(); } } //Update statement public void Update() { string query = "UPDATE emp SET e_name='Peachy', age='22' WHERE e_name='Pooja R'"; //Open connection if (this.OpenConnection() == true) { //create mysql command MySqlCommand cmd = new MySqlCommand(); //Assign the query using CommandText cmd.CommandText = query; //Assign the connection using Connection cmd.Connection = connection; //Execute query cmd.ExecuteNonQuery(); //close connection this.CloseConnection(); } } //Select statement public List<string>[] Select() { string query = "SELECT * FROM emp where e_name=(/*I WANT USER ENTERED NAME TO GET INSERTED HERE*/)"; //Create a list to store the result List<string>[] list = new List<string>[3]; list[0] = new List<string>(); list[1] = new List<string>(); list[2] = new List<string>(); //Open connection if (this.OpenConnection() == true) { //Create Command MySqlCommand cmd = new MySqlCommand(query, connection); //Create a data reader and Execute the command MySqlDataReader dataReader = cmd.ExecuteReader(); //Read the data and store them in the list while (dataReader.Read()) { list[0].Add(dataReader["e_id"] + ""); list[1].Add(dataReader["e_name"] + ""); list[2].Add(dataReader["age"] + ""); } //close Data Reader dataReader.Close(); //close Connection this.CloseConnection(); //return list to be displayed return list; } else { return list; } } public static void Main(String[] args) { DBConnect db1 = new DBConnect(); Console.WriteLine("Initializing"); db1.Initialize(); Console.WriteLine("Search :"); Console.WriteLine("Enter the employee name"); db1.name = Console.ReadLine(); db1.Select(); Console.ReadLine(); } } }

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• Only some windows shell commands work via ruby?

  - by Sanarothe

  Hi. I'm trying to use a script to control my power options since XP doesn't give you an intuitive way to change CPU Frequency options. Here's my script so far: meh = `cmd.exe /C POWERCFG.EXE /QUERY Portable/Laptop` puts "" puts meh case input when 1 then system('cmd.exe /C POWERCFG.EXE /CHANGE Portable/Laptop /processor-throttle-ac NONE') when 2 then system('cmd.exe /C POWERCFG.EXE /CHANGE Portable/Laptop /processor-throttle-ac ADAPTIVE') when 3 then `cmd.exe /C POWERCFG.EXE /CHANGE Portable/Laptop /processor-throttle-ac CONSTANT` end The problem is that the changes simply don't take place. If I run the same commands directly into a cmd.exe prompt, they work. It's very strange, but nothing works after the initial powercfg query. I feel like I'm missing something incredibly obvious. How can I get the above script to run correctly?

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• How to refresh to entire device's screen (Windows Mobile)?

  - by walidad

  Hi everybody, I'm working on a simple application that draws an alpha-blended picture on the screen's Device Context every 2 secs, I want to refresh the screen contents before the drawing operation (To erase the drawn pic), I have used many many trick but unfortunately, the screen won't refresh correctly, some regions still keep portions of the drawn pic I'm really frustrated from this issue :( These are the sources codes I have used, I'm using C# SendMessage(HWND_BROADCAST, WM_SYSCOLORCHANGE, IntPtr.Zero, IntPtr.Zero); // wasted time in the refreshing process is enough to keep this. UpdateWindow(HWND_BROADCAST);// does not work at all! InvalidateRect(IntPtr.Zero,IntPtr.Zero,true); // the same goes here. SendMessage(HWND_BROADCAST, WM_PAINT, IntPtr.Zero, IntPtr.Zero); // pfffff ! SendMessage(HWND_BROADCAST, WM_SETTINGCHANGE, new IntPtr(SPI_SETNONCLIENTMETRICS), IntPtr.Zero); // trying to refresh the explorer, no resutl I used also EnumWindows and call back , very slow and does not fit my case. I wanna refresh the whole screen Help please! Regards Waleed

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• How to exclude read only fields using :input in jquery?

  - by melaos

  hi guys, thus far i've only been using some basic jquery selectors and functions. but i'm looking at this clear form function and i can't figure out how to add it so i can remove hidden inputs and readonly input from getting cleared. can anybody help? thanks. function clearForm(form) { // iterate over all of the inputs for the form // element that was passed in $(':input', form).each(function() { var type = this.type; var tag = this.tagName.toLowerCase(); // normalize case // it's ok to reset the value attr of text inputs, // password inputs, and textareas if (type == 'text' || type == 'password' || tag == 'textarea') this.value = ""; // checkboxes and radios need to have their checked state cleared // but should *not* have their 'value' changed else if (type == 'checkbox' || type == 'radio') this.checked = false; // select elements need to have their 'selectedIndex' property set to -1 // (this works for both single and multiple select elements) else if (tag == 'select') this.selectedIndex = -1; }); };

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