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• Can someone explain the true landscape of Rails vs PHP deployment, particularly within the context of Reseller-based web hosting (e.g., Hostgator)?

  - by rcd

  Currently, I have a reseller account with the company HostGator. I design websites, which up until now have occasionally been wrapped in Wordpress CMSs and the like (PHP applications). I then sell hosting (of the site I've designed) to the client, which is pretty simple, in that I can simply click a button and add a new shared hosting account/site with whatever settings I want. Furthermore, I then utilize WHMCS to automate billing and account management. It's a nice package and pretty simple. I pay something like $25 a month, and can sell a hundred accounts under this (because my clients bandwidth requirements are low). Now I am finding the need to develop more customized applications, including a minimalist CMS and several proprietary things. I soon anticipate developing these apps for clients as well. Thus, I've spent the past few months learning Rails, and it's coming along well now. The thing that has nagged at me all along, though, is the deployment issue. I can't wrap my brain around it. It seems like all of the popular options (Heroku, etc) have nice automation with git and are set up in the "Rails Way". I get that (sort of). But it's terribly expensive... a single dyno, a helper, and the cheapest database (which they say is mainly suitable for testing) that isn't limited to 5MB runs $51. This is for ONE app!!! Throw in a "production" DB and you're over $200. This is like... the same prices as getting a server somewhere, right? Meanwhile, going back to what I guess is a "traditional" hosting environment with Hostgator, their server only has Ruby 1.8.7 and Rails 2.3.5... No Rails 3. AND, no Passenger (not that I really understand the difference in CGI or mod_rails or whatever, but they say Passenger is the simplest). So I'm to understand that if I build an app in Rails 3, it won't run at all on this host? But damn, I already have these accounts under my reseller account there, all running static html and/or PHP stuff, right? So what now? How do I get all of this under one simple (and affordable) roof? Forgive my ignorance, but I just don't get it. Managing a VPS is cool and all, but entails learning server admin stuff and security... And it's expensive. I get that a shared and/or reseller "server-based" (forgive the terminology) may be inadequate for large-scale apps that use a lot of bandwidth... But what about for those of us who are building real (but small and low bandwidth) apps (with Rails) and who want to deploy them simply, cheaply, using the same conceptual approach as PHP? Even after learning all of this Ruby and Rails stuff for months, I'm questioning whether it's worth it when it comes to deployment. I want to build a small app, upload it to my home directory on a shared server account, and just make it run. Why should that be so hard? Am I just choosing the wrong language/framework? Forgive my ignorance in the subject; these questions are not rhetorical; just trying to learn here. So: 1) I'd appreciate if someone could give me a good rundown of how to understand deployment in Rails vs. PHP. 2) I'd appreciate if someone could address my issue with running a hosting/web business around reseller hosting (Hostgator) while also being able to host Rails apps. Can it be done? And how can a company like Hostgator completely ignore what's current in Rails/Ruby? Thanks.

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• I need help with 2D collision response (of stacking rotating polygons, with friction and gravity, for a game)

  - by Register Sole

  Hi I am looking for suggestions on how to write a collision response for game programming purpose (so not a scientific simulation). I am dealing with 2D polygons that are rotating, and I want them to be able to stack. I also want friction and gravity. I have a detection mechanism that returns the separating axis, how long the polygons are overlapping, and up to 2 points of contact. For the response, I am currently using an impulse-based response, which main idea is: find the separating axis, length of overlap, and the point of contact (if there are two, pick a random point between to simulate averaged force. i believe there are better ways than this) separate the object (modifying their positions, taking into account of their masses. i do not separate them completely though, to keep track that they are colliding to reduce jitter) calculate normal force based on the coefficient of restitution as if there is no friction. calculate friction, as if there is no normal force. I also assume that the direction of the friction is the same throughout the collision. apply the two forces (which result in a rather inaccurate result, since each force is calculated as if the other is not present. for non-rotating bodies though, this method is exact) I am aware that this method requires the coefficient of friction to be sufficiently small due to the assumption that the direction of friction stays the same in a collision. Also, the result is visually satisfying if gravity is not present. However, when there is gravity, objects on ground jitter and drift (even with zero coefficient of restitution)! It also happens for stacking objects. Larger coefficient of restitution and gravity increase the jittering. I hope you can help me with this. Some things i would like to know more about is how to handle collision with two point of contacts (how to end up having an object sitting still on the ground?), how to reduce, and prevent if possible, jitter and drift (do people use the most accurate method possible, or is there a trick to overcome this?), and how to handle multiple objects collision (for example, in the case of stacking objects, how do I check collisions between all of them and keep them all stable at every frame so they don't jitter?). A total reformulation of my algorithm is also welcomed, as long as it works. Another thing to note is that I am not making a Physics game, so I only need a visually satisfying response (though a realistic response is preferable, if it is not performance-heavy). But surely jittering and drifting objects on flat ground are not at all acceptable. In addition, I am a Physics student, so feel free to talk about impulse and whatever needed. Finally, I'm sorry for the long post. I tried to be as concise as I can. Thank you for reading it! EDIT It seems what I didn't manage to come up all this time is to separate resting contact as a class of its own and how to solve them. Currently reading the paper suggested by Jedediah. More suggestions on the topic are welcome :) CASE CLOSED After reading various papers referenced in the paper, successfully implemented simultaneous impulse method (referring to the original paper by Erin Catto, [Catt05]). Thanks maaaan!! The paper is wonderful. The current system is visibly much better than the previous. Still haven't separated resting contact as a class of its own though, which brings me to my next question. Love you all! Haha (sorry, I'm just so happy thanks to you).

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• Managed c++ std::string not accessible in unmanaged c++

  - by Radhesham

  In unmanaged c++ dll i have a function which takes constant std::string as argument Prototype : void read ( const std::string &amp;imageSpec_ ) I call this function from managed c++ dll by passing a std::string. When i debug the unmanaged c++ code the parameter imageSpec_ shows the value correctly but does not allow me to copy that value in other variable. imageSpec_.copy( sFilename, 4052 ); It shows length of imageSpec_ as 0(zero). If i try copying like std::string sTempFileName(imageSpec_); this statement string new string is a empty string. But for std::string sTempFileName(imageSpec_.c_str()); this statement string gets copied correctly. i.e. with charpointer string is copied correctly. Copying this way will need a major change in unmanaged c++ code. I am building unmanaged code in Visual studio 6.0 and managed c++ in Visual studio 2008. Is there any specific setting or code change in managed c++ that will solve the issue?

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• Pass a JSON array to a WCF web service

  - by Tawani

  I am trying to pass a JSON array to a WCF service. But it doesn't seem to work. I actually pulled an array [GetStudents] out the service and sent the exact same array back to the service [SaveStudents] and nothing (empty array) was received. The JSON array is of the format: [ {"Name":"John","Age":12}, {"Name":"Jane","Age":11}, {"Name":"Bill","Age":12} ] And the contracts are of the following format: //Contracts [DataContract] public class Student{ [DataMember]public string Name { get; set; } [DataMember]public int Age{ get; set; } } [CollectionDataContract(Namespace = "")] public class Students : List<Student> { [DataMember]public Endorsements() { } [DataMember]public Endorsements(IEnumerable<Student> source) : base(source) { } } //Operations public Students GetStudents() { var result = new Students(); result.Add(new Student(){Name="John",12}); result.Add(new Student(){Name="Jane",11}); result.Add(new Student(){Name="Bill",12}); return result; } //Operations public void SaveStudents(Students list) { Console.WriteLine(list.Count); //It always returns zero } It there a particular way to send an array to a WCF REST service?

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• Where is the documentation for MSBUILD arguments to run MSDEPLOY?

  - by Simon_Weaver

  There is an excellent PDC talk available here which describes the new MSDEPLOY features in Visual Studio 2010 - as well as how to deploy an application within TFS. The talk explains some of the command line parameters such as : /p:DeployOnBuild /p:DeployTarget=MsDeployPublish /p:CreatePackageOnPublish=True /p:MSDeployPublishMethod=InProc /p:MSDeployServiceURL=localhost /p:DeployIISAppApth="Default Web Site" But where is the documentation for this - explaining how they work and what i should use? Most of these turn up very few or zero results when searching. Isn't there some actual documentation for these parameters somewhere? I'd rather use these to deploy than try to add a command line exec command to run the package. I've managed to create a web deployment package, which TFS is copying to the output. But I'm ending up with all kinds of errors trying to actually deploy the package. Currently in my build configuration in TFS I have the following arguments for MSBuild Arguments /p:DeployOnBuild=True /p:DeployTarget=MsDeployPublish /p:Configuration=Release /p:CreatePackageOnPublish=True /p:DeployIisAppPath=staging.example.com /p:MsDeployServiceUrl=localhost This however gives me this error : Is there any actual real documentation for these arguments? It would probably take me about 5 minutes to get it running the package by the command line, but i want to get them deploying like this because it will simplify multiple configurations later.

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• Is it possible for a WPF control to have an ActualWidth and ActualHeight if it has never been render

  - by DanM

  I need a Viewport3D for the sole purpose of doing geometric calculations using Petzold.Media3D.ViewportInfo. I do now want to place it in a Window. I'm creating a Viewport3D using the following code: private Viewport3D CreateViewport(MainSettings settings) { var cameraPosition = new Point3D(0, 0, settings.CameraHeight); var cameraLookDirection = new Vector3D(0, 0, -1); var cameraUpDirection = new Vector3D(0, 1, 0); var camera = new PerspectiveCamera { Position = cameraPosition, LookDirection = cameraLookDirection, UpDirection = cameraUpDirection }; var viewport = new Viewport3D { Camera = camera, Width = settings.ViewportWidth, Height = settings.ViewportHeight }; return viewport; } Later, I'm attempting to use this viewport to convert the mouse location to a 3D location using this method: public Point3D? Point2dToPoint3d(Point point) { var range = new LineRange(); var isValid = ViewportInfo.Point2DtoPoint3D(_viewport, point, out range); if (isValid) return range.PointFromZ(0); else return null; } Unfortunately, it's not working. I think the reason is that the ActualWidth and ActualHeight of the viewport and both zero (and these are read-only properties, so I can't set them manually). (I have tested the exact same with an actual rendered Viewport3D, so I know the issue is not with my converter method.) Any idea how I can get WPF to assign the ActualWidth and ActualHeight based on my Width and Height settings? I tried setting the HorizontalAlignment and VerticalAlignment to Left and Top, respectively, and I also messed with the MinWidth and MinHeight, but none of these properties had any effect on the ActualWidth or ActualHeight.

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• What is a good alternative to the WPF WebBrowser Control?

  - by VoidDweller

  I have an MDI WPF app that I need to add web content to. At first, great it looks like I have 2 options built into the framework the Frame control and the WebBrowser control. Given that this is an MDI app it doesn't take long to discover that neither of these will work. The WPF WebBrowser control wraps up the IE WebBrowser ActiveX Control which uses the Win32 graphics pipeline. The "Airspace" issue pretty much sums this up as "Sorry, the layouts will not play nice together". Yes, I have thought about taking snapshots of the web content rendering these and mapping the mouse and keyboard events back to the browser control, but I can't afford the performance penalty and I really don't have time to write and thoroughly test it. I have looked for third party controls, but so far I have only found Chris Cavanagh's WPF Chromium Web Browser control. Which wraps up Awesomium 1.5. Together these are very cool, they play nice with the WPF layouts. But they do not meet my performance requirements. They are VERY HEAVY on memory consumption and not to friendly with CPU usage either. Not to mention still quite buggy. I'll elaborate if you are interested. So, do any of you know of a stable performant WPF web browser control? Thanks.

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• Binding Image.Source to String in WPF ?

  - by Mohammad

  I have below XAML code : <Window x:Class="WpfApplication1.Window1" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" DataContext="{Binding RelativeSource={RelativeSource Self}}" WindowStartupLocation="CenterScreen" Title="Window1" Height="300" Width="300"> <Grid> <Image x:Name="TestImage" Source="{Binding Path=ImageSource}" /> </Grid> </Window> Also, there is a method that makes an Image from a Base64 string : Image Base64StringToImage(string base64ImageString) { try { byte[] b; b = Convert.FromBase64String(base64ImageString); MemoryStream ms = new System.IO.MemoryStream(b); System.Drawing.Image img = System.Drawing.Image.FromStream(ms); ////////////////////////////////////////////// //convert System.Drawing.Image to WPF image System.Drawing.Bitmap bmp = new System.Drawing.Bitmap(img); IntPtr hBitmap = bmp.GetHbitmap(); System.Windows.Media.ImageSource imageSource = System.Windows.Interop.Imaging.CreateBitmapSourceFromHBitmap(hBitmap, IntPtr.Zero, Int32Rect.Empty, BitmapSizeOptions.FromEmptyOptions()); Image wpfImage = new Image(); wpfImage.Source = imageSource; wpfImage.Width = wpfImage.Height = 16; ////////////////////////////////////////////// return wpfImage; } catch { Image img1 = new Image(); img1.Source = new BitmapImage(new Uri(@"/passwordManager;component/images/TreeView/empty-bookmark.png", UriKind.Relative)); img1.Width = img1.Height = 16; return img1; } } Now, I'm gonna bind TestImage to the output of Base64StringToImage method. I've used the following way : public string ImageSource { get; set; } ImageSource = Base64StringToImage("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").Source.ToString(); but nothing happen. How can I fix it ? BTW, I'm dead sure that the base64 string is correct

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• Rebinding events in jQuery after Ajax update (updatepanel)

  - by Hojou

  I have several input and option elements on my page, each (well almost) have an event attached to update some text on the page once they change. I use jQuery which is really really cool :) I also use Microsofts Ajax framework, utilizing the UpdatePanel. The reason why I do that is that certain elements are created on the page based on some server-side logic. I don't really want to explain why I use the UpdatePanel - even if it could (it can with quite some effort) be rewritten to use only jQuery I still want that UpdatePanel. You probably guessed it - once I have a postback on the UpdatePanel the jQuery events stops working. I actually was expecting this, since the "postback" is not really a new postback so my code in document.ready that binds the events won't be fired again. I also confirmed my suspicion by reading up on it in the jQuery help libraries. Anyway I'm left with the problem of rebinding my controls after the UpdatePanel is done updating the DOM. I preferably need a solution that does not require adding more .js files (jQuery plug-ins) to the page but something as simple as being able to catch the UpdatePanel's 'afterupdating' where I can just call my method to rebind all the form elements.

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• python unhashable type - posting xml data

  - by eterry28

  First, I'm not a python programmer. I'm an old C dog that's learned new Java and PHP tricks, but python looks like a pretty cool language. I'm getting an error that I can't quite follow. The error follows the code below. import httplib, urllib url = "pdb-services-beta.nipr.com" xml = '<?xml version="1.0"?><!DOCTYPE SCB_Request SYSTEM "http://www.nipr.com/html/SCB_XML_Request.dtd"><SCB_Request Request_Type="Create_Report"><SCB_Login_Data CustomerID="someuser" Passwd="somepass" /><SCB_Create_Report_Request Title=""><Producer_List><NIPR_Num_List_XML><NIPR_Num NIPR_Num="8980608" /><NIPR_Num NIPR_Num="7597855" /><NIPR_Num NIPR_Num="10166016" /></NIPR_Num_List_XML></Producer_List></SCB_Create_Report_Request></SCB_Request>' params = {} params['xmldata'] = xml headers = {} headers['Content-type'] = 'text/xml' headers['Accept'] = '*/*' headers['Content-Length'] = "%d" % len(xml) connection = httplib.HTTPSConnection(url) connection.set_debuglevel(1) connection.request("POST", "/pdb-xml-reports/scb_xmlclient.cgi", params, headers) response = connection.getresponse() print response.status, response.reason data = response.read() print data connection.close Here's the error: Traceback (most recent call last): File "C:\Python27\tutorial.py", line 14, in connection.request("POST", "/pdb-xml-reports/scb_xmlclient.cgi", params, headers) File "C:\Python27\lib\httplib.py", line 958, in request self._send_request(method, url, body, headers) File "C:\Python27\lib\httplib.py", line 992, in _send_request self.endheaders(body) File "C:\Python27\lib\httplib.py", line 954, in endheaders self._send_output(message_body) File "C:\Python27\lib\httplib.py", line 818, in _send_output self.send(message_body) File "C:\Python27\lib\httplib.py", line 790, in send self.sock.sendall(data) File "C:\Python27\lib\ssl.py", line 229, in sendall v = self.send(data[count:]) TypeError: unhashable type My log file says that the xmldata parameter is empty. Any ideas?

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• Parse html and find data in the html

  - by Dan.StackOverflow

  Hi all. I am trying to use html5lib to parse an html page in to something I can query with xpath. html5lib has close to zero documentation and I've spent too much time trying to figure this problem out. Ultimate goal is to pull out the second row of a table: <html> <table> <tr><td>Header</td></tr> <tr><td>Want This</td></tr> </table> </html> so lets try it: >>> doc = html5lib.parse('<html><table><tr><td>Header</td></tr><tr><td>Want This</td> </tr></table></html>', treebuilder='lxml') >>> doc <lxml.etree._ElementTree object at 0x1a1c290> that looks good, lets see what else we have: >>> root = doc.getroot() >>> print(lxml.etree.tostring(root)) <html:html xmlns:html="http://www.w3.org/1999/xhtml"><html:head/><html:body><html:table><html:tbody><html:tr><html:td>Header</html:td></html:tr><html:tr><html:td>Want This</html:td></html:tr></html:tbody></html:table></html:body></html:html> LOL WUT? seriously. I was planning on using some xpath to get at the data I want, but that doesn't seem to work. So what can I do? I am willing to try different libraries and approaches.

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• Java: immutable Stack?

  - by HH

  I chose to use Stacks and Tables before knowing Collections has immutable empty things only for Set, Map and List. Because the size of table does not change after its init: Integer[] table = new Intger[0] I can use the zero-witdh table as an empty table. But I cannot use final or empty Stack to get immutable Stack: No immutability to Stack with Final import java.io.*; import java.util.*; public class TestStack{ public static void main(String[] args) { final Stack<Integer> test = new Stack<Integer>(); Stack<Integer> test2 = new Stack<Integer>(); test.push(37707); test2.push(80437707); //WHY is there not an error to remove an elment // from FINAL stack? System.out.println(test.pop()); System.out.println(test2.pop()); } } Java Api 5 for list interface shows that Stack is an implementing class for list and arraylist, here. The java.coccurrent pkg does not have any immutable Stack data structure. From Stack to some immutable data structure How to get immutable Stack data structure? Can I box it with list? Should I switch my current implementatios from stacks to Lists to get immutable? Which immutable data structure is Very fast with about similar exec time as Stack?

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• Cannot resolve TargetName - Silverlight4 C#

  - by Redburn

  I am getting the error Cannot resolve TargetName grdGeneral. What I am trying to do is have a fade out function which accepts a grid and fades the opacity to zero. I have this function called on MouseLeftButtonDown and is loaded after the xaml and form has loaded. Calling the fade out: private void imgNext_MouseLeftButtonDown(object sender, MouseButtonEventArgs e) { fadeOut(grdGeneral); } The fade out function: private void fadeOut(Grid pGrid) { Storyboard stb = new Storyboard(); DoubleAnimation da = new DoubleAnimation(); da.From = 1.0; da.To = 0.0; stb.Duration = new Duration(TimeSpan.FromSeconds(.75)); stb.Children.Add(da); Storyboard.SetTargetName(da, pGrid.Name); Storyboard.SetTargetProperty(da, new PropertyPath(Grid.OpacityProperty)); stb.Begin(); } I have been on a handful of tutorial sites and my code seems to follow the same order. I also have been on this stackoverflow question before you say repost. That question has to deal with mutlipages and I am merely trying to start a animation. The Stack Trace System.InvalidOperationException was unhandled by user code Message=Cannot resolve TargetName grdGeneral. StackTrace: at MS.Internal.XcpImports.MethodEx(IntPtr ptr, String name, CValue[] cvData) at MS.Internal.XcpImports.MethodEx(DependencyObject obj, String name) at System.Windows.Media.Animation.Storyboard.Begin() at MeterTesting.QuarterReportGUI.fadeOut(Grid pGrid) at MeterTesting.QuarterReportGUI.imgNext_MouseLeftButtonDown(Object sender, MouseButtonEventArgs e) at MS.Internal.CoreInvokeHandler.InvokeEventHandler(Int32 typeIndex, Delegate handlerDelegate, Object sender, Object args) at MS.Internal.JoltHelper.FireEvent(IntPtr unmanagedObj, IntPtr unmanagedObjArgs, Int32 argsTypeIndex, String eventName) InnerException:

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• "cloud architecture" concepts in a system architecture diagrams

  - by markus

  If you design a distributed application for easy scale-out, or you just want to make use of any of the new “cloud computing” offerings by Amazon, Google or Microsoft, there are some typical concepts or components you usually end up using: distributed blob storage (aka S3) asynchronous, durable message queues (aka SQS) non-Relational-/non-transactional databases (like SimpleDB, Google BigTable, Azure SQL Services) distributed background worker pool load-balanced, edge-service processes handling user requests (often virtualized) distributed caches (like memcached) CDN (content delivery network like Akamai) Now when it comes to design and sketch an architecture that makes use of such patterns, are there any commonly used symbols I could use? Or even a download with some cool Visio stencils? :) It doesn’t have to be a formal system like UML but I think it would be great if there were symbols that everyone knows and understands, like we have commonly used shapes for databases or a documents, for example. I think it would be important to not mix it up with traditional concepts like a normal file system (local or network server/SAN), or a relational database. Simply speaking, I want to be able to draw some conclusions about an application’s scalability or data consistency issues by just looking at the system architecture overview diagram. Update: Thank you very much for your answers. I like the idea of putting a small "cloud symbol" on the traditional symbols. However I leave this thread open just in case someone will find specific symbols (maybe in a book or so) - or uploaded some pimped up Visio stencils ;)

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• What is the equivalent of memset in C#?

  - by Jedidja

  I need to fill a byte[] with a single non-zero value. How can I do this in C# without looping through each byte in the array? Update: The comments seem to have split this into two questions - Is there a Framework method to fill a byte[] that might be akin to memset What is the most efficient way to do it when we are dealing with a very large array? I totally agree that using a simple loop works just fine, as Eric and others have pointed out. The point of the question was to see if I could learn something new about C# :) I think Juliet's method for a Parallel operation should be even faster than a simple loop. Benchmarks: Thanks to Mikael Svenson: http://techmikael.blogspot.com/2009/12/filling-array-with-default-value.html It turns out the simple for loop is the way to go unless you want to use unsafe code. Apologies for not being clearer in my original post. Eric and Mark are both correct in their comments; need to have more focused questions for sure. Thanks for everyone's suggestions and responses.

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• Autonumber with Entity Framework

  - by dcompiled

  I want to loop through a collection of objects and add them all to a table. The destination table has an auto-increment field. If I add a single object there is no problem. If I add two objects both with the primary key of zero, the entity framework fails. I can manually specify primary keys but the whole point of trying the EF was to make life easier not more complicated. Here is the code and the exception received follows. foreach (Contact contact in contacts) { Instructor instructor = InstructorFromContact(contact); context.AddToInstructors(instructor); } try { context.SaveChanges(); } catch (Exception ex) { Console.WriteLine(ex.ToString()); } System.InvalidOperationException: The changes to the database were committed successfully, but an error occurred while updating the object context. The ObjectContext might be in an inconsistent state. Inner exception message: AcceptChanges cannot continue because the object's key values conflict with another object in the ObjectStateManager. Make sure that the key values are unique before calling AcceptChanges. at System.Data.Objects.ObjectContext.SaveChanges(SaveOptions options) at System.Data.Objects.ObjectContext.SaveChanges() at DataMigration.Program.CopyInstructors() in C:\Projects\DataMigration\Program.cs:line 52

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• Instantiate an .aspx that is an embedded resource of an assembly

  - by asbjornu

  I have an ASP.NET (MVC) application in which I would like to load WebForms .aspx files that are embedded as resources in 3rd party assemblies. The reason I want to do this is to make a sort of "plug-in" system where a .dll file can be dropped in a folder and then picked up at runtime to provide additional functionality to the base application. I've gotten the plugin system to work (I'm using MEF) with plugins written in ASP.NET MVC (Views and Controllers), but for plain old ASP.NET (Pages), I've got myself into a bit of a problem. For the execution of the embedded .aspx file (which, in the usual WebForm way Inherits="My.BasePage") I've created a custom VirtualPathProvider, ResourceFile ControllerFactory and PageController. Within the PageController I've overridden the Execute(RequestContext) method and within it I'm trying to compile the .aspx with BuildManager.CreateInstanceFromVirtualPath(virtualPath, type). When doing this, I get the error message "Could not load type 'My.BasePage'", even though I'm giving the BuildManager the System.Type of My.BasePage in the call to CreateInstanceFromVirtualPath. I seem to be stuck at this point. I've tried to Server.Transfer() to the custom VirtualPathProvider handled URL to the same .aspx file, but that fails with the same error message. How can I help BuildManager find out where My.BasePage is defined and how come the Type requiredBaseType parameter of CreateInstanceFromVirtualPath seems to be ignored? I've tried to call BuildManager.AddReferencedAssembly(), but that only fails with "This method can only be called during the application's pre-start initialization stage". MSDN says: "The method must be called during the Application_PreStartInit stage of the application", but I have no such event in my HttpApplication object and find absolutely zero information about it on the internet. Either way, I don't want to be calling BuildManager.AddReferencedAssembly() in or before the Application_Start event, since that makes me have to recycle the whole application to be able to add new plugins to the system. Does anyone have any clues? Any other ideas on how I can "execute" an .aspx file that is embedded as a resource within an assembly through reflection? Can I for instance pre-compile the .aspx file within the same assembly as the base Page class it inherits?

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• Stresstesting ASP.NET/IIS with WCAT

  - by MartinHN

  I'm trying to setup a stress/load test using the WCAT toolkit included in the IIS Resources. Using LogParser, I've processed a UBR file with configuration. It looks something like this: [Configuration] NumClientMachines: 1 # number of distinct client machines to use NumClientThreads: 100 # number of threads per machine AsynchronousWait: TRUE # asynchronous wait for think and delay Duration: 5m # length of experiment (m = minutes, s = seconds) MaxRecvBuffer: 8192K # suggested maximum received buffer ThinkTime: 0s # maximum think-time before next request WarmupTime: 5s # time to warm up before taking statistics CooldownTime: 6s # time to cool down at the end of the experiment [Performance] [Script] SET RequestHeader = "Accept: */*\r\n" APP RequestHeader = "Accept-Language: en-us\r\n" APP RequestHeader = "User-Agent: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.2; .NET CLR 1.0.3705)\r\n" APP RequestHeader = "Host: %HOST%\r\n" NEW TRANSACTION classId = 1 NEW REQUEST HTTP ResponseStatusCode = 200 Weight = 45117 verb = "GET" URL = "http://Url1.com" NEW TRANSACTION classId = 3 NEW REQUEST HTTP ResponseStatusCode = 200 Weight = 13662 verb = "GET" URL = "http://Url1.com/test.aspx" Does it look OK? I execute the controller with this command: wcctl -z StressTest.ubr -a localhost The Client(s) is executed like this: wcclient localhost When the client is executed, I get this error: main client thread Connect Attempt 0 Failed. Error = 10061 Has anyone in this world ever used WCAT?

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• hibernate validationQuery.. proper way to use it

  - by cometta

  sometime the connection from application to database will drop and i get SQLState: 08006 error Code: 17002. Below is my configuration for database pooling <prop key="hibernate.dialect">org.hibernate.dialect.Oracle10gDialect</prop> <prop key="hibernate.show_sql">true</prop> <prop key="hibernate.format_sql">true</prop> <prop key="hibernate.use_sql_comments">true</prop> <prop key="hibernate.cglib.use_reflection_optimizer">true</prop> <!-- true ==start up slower, but performacen on runtime good--> <prop key="hibernate.hbm2ddl.auto">update</prop> <prop key="hibernate.c3p0.min_size">5</prop> <prop key="hibernate.c3p0.max_size">20</prop> <prop key="hibernate.c3p0.timeout">1800</prop> <prop key="hibernate.c3p0.max_statements">100</prop> <!-- c3p0's PreparedStatement cache. Zero means statement caching is turned off. --> Can anyone advise, should i use validationQuery, onBorrow.. and why need to use it? what other properties should i use to enhance stability of the connection from my application to oracle10g?

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• How to get Processor and Motherboard Id ?

  - by Frank

  I use the code from http://www.rgagnon.com/javadetails/java-0580.html to get Motherboard Id, but the result is "null", <1 How can that be ? <2 Also I modified the code a bit to look like this to get processor Id : "Set objWMIService = GetObject(\"winmgmts:\\\\.\\root\\cimv2\")\n"+ "Set colItems = objWMIService.ExecQuery _ \n"+ " (\"Select * from Win32_Processor\") \n"+ "For Each objItem in colItems \n"+ " Wscript.Echo objItem.ProcessorId \n"+ " exit for ' do the first cpu only! \n"+ "Next \n"; The result is something like : ProcessorId = BFEBFBFF00010676 On http://msdn.microsoft.com/en-us/library/aa389273%28VS.85%29.aspx it says : ProcessorId : Processor information that describes the processor features. For an x86 class CPU, the field format depends on the processor support of the CPUID instruction. If the instruction is supported, the property contains 2 (two) DWORD formatted values. The first is an offset of 08h-0Bh, which is the EAX value that a CPUID instruction returns with input EAX set to 1. The second is an offset of 0Ch-0Fh, which is the EDX value that the instruction returns. Only the first two bytes of the property are significant and contain the contents of the DX register at CPU reset—all others are set to 0 (zero), and the contents are in DWORD format. I don't quite understand it, in plain English, is it unique or just a number for this class of processors, for instance all Intel Core2 Duo P8400 will have this number ? Frank

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• How to list column headers of a SQL Server table using sp_help perhaps?

  - by Hamish Grubijan

  Hi, I have a few tables with 70-80 columns in them. I would like to populate them with somewhat random data, unless I will not be able to do so due to key violation, etc. The first step would be simply to get the list of all headers. There seem to be two ways: A) Run select * from table_of_interest; in MSFT SQL Server Management Studio 2008. Now, right-click the result and click "Copy With headers". However, I get zero rows back, and when I try to copy nothing + headers, I get: TITLE: Microsoft SQL Server Management Studio ------------------------------ Value cannot be null. Parameter name: data (System.Windows.Forms) ------------------------------ BUTTONS: OK ------------------------------ This looks like a bug ... anyhow ... there is another way. B) I can run sp_help table_of_interest;. However, I end up getting too much back. I get 7 different tables back but I am only interested in the second one. The columns of the second table are: Column_name | Type | Computed | Length | Prec | Scale | Nullable | TrimTrailingBlanks | FixedLenNullInSource | Collation I might be interested in just a Column_name and Type, but maybe other columns. So ... since sp_help probably runs a bunch of queries ... how do I get under the hood? How can I run the second query AND filter down the number of columns that I am interested in? Many Thanks!

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• RubyQT QGraphicsview scale images to fit window

  - by shadowskill

  I'm trying to make an image scale inside of a QGraphicsView and having zero success. I did find this C++ question with what seemed to be the same problem:http://stackoverflow.com/questions/2489754/qgraphicsview-scrolling-and-image-scaling-cropping I borrowed the approach of overriding the drawback/foreground. However when I run the script I'm greeted with a method_missing error: method_missing: undefined method drawPixmap for #<Qt::Painter:0x7ff11eb9b088> QPaintDevice: Cannot destroy paint device that is being painted What should I be doing to get the QGraphicsView to behave the way I want? class Imageview < Qt::GraphicsView attr_reader :pixmap def initialize(parent=nil) # @parent=parent super() @pixmap=pixmap Qt::MetaObject.connectSlotsByName(self) end def loadimage(pixmap) @pixmap=pixmap end def drawForeground(painter, rect) #size=event.size() #item= self.items()[0] #Qt::GraphicsPixmapItem.new #pixmap=@pixmap #painter=Qt::Painter.new [email protected](Qt::Size.new(rect.width,rect.height),Qt::KeepAspectRatio, Qt::SmoothTransformation) # painter.begin(self) painter.drawPixmap(rect,sized,Qt::Rect.new(0.0, 0.0, sized.width,sized.height)) #painter.end() # item.setPixmap(sized) #painter.end self.centerOn(1.0,1.0) #item.scale() # item.setTransformationMode(Qt::FastTransformation) # self.fitInView(item) end def updateSceneRect painter=Qt::Painter.new() drawForeground(painter,self.sceneRect) end end app=Qt::Application.new(ARGV) #grview=Imageview.new pic=Qt::Pixmap.new('pic') grview=Imageview.new() grview.loadimage(pic) scene=Qt::GraphicsScene.new #scene.addPixmap(pic) grview.setScene(scene) #grview.fitInView(scene) grview.renderHint=Qt::Painter::Antialiasing | Qt::Painter::SmoothPixmapTransform grview.backgroundBrush = Qt::Brush.new(Qt::Color.new(230, 200, 167)) grview.show app.exec

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• Boosting my GA with Neural Networks and/or Reinforcement Learning

  - by AlexT

  As I have mentioned in previous questions I am writing a maze solving application to help me learn about more theoretical CS subjects, after some trouble I've got a Genetic Algorithm working that can evolve a set of rules (handled by boolean values) in order to find a good solution through a maze. That being said, the GA alone is okay, but I'd like to beef it up with a Neural Network, even though I have no real working knowledge of Neural Networks (no formal theoretical CS education). After doing a bit of reading on the subject I found that a Neural Network could be used to train a genome in order to improve results. Let's say I have a genome (group of genes), such as 1 0 0 1 0 1 0 1 0 1 1 1 0 0... How could I use a Neural Network (I'm assuming MLP?) to train and improve my genome? In addition to this as I know nothing about Neural Networks I've been looking into implementing some form of Reinforcement Learning, using my maze matrix (2 dimensional array), although I'm a bit stuck on what the following algorithm wants from me: (from http://people.revoledu.com/kardi/tutorial/ReinforcementLearning/Q-Learning-Algorithm.htm) 1. Set parameter , and environment reward matrix R 2. Initialize matrix Q as zero matrix 3. For each episode: * Select random initial state * Do while not reach goal state o Select one among all possible actions for the current state o Using this possible action, consider to go to the next state o Get maximum Q value of this next state based on all possible actions o Compute o Set the next state as the current state End Do End For The big problem for me is implementing a reward matrix R and what a Q matrix exactly is, and getting the Q value. I use a multi-dimensional array for my maze and enum states for every move. How would this be used in a Q-Learning algorithm? If someone could help out by explaining what I would need to do to implement the following, preferably in Java although C# would be nice too, possibly with some source code examples it'd be appreciated.

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• Find the "largest" dense sub matrix in a large sparse matrix

  - by BCS

  Given a large sparse matrix (say 10k+ by 1M+) I need to find a subset, not necessarily continuous, of the rows and columns that form a dense matrix (all non-zero elements). I want this sub matrix to be as large as possible (not the largest sum, but the largest number of elements) within some aspect ratio constraints. Are there any known exact or aproxamate solutions to this problem? A quick scan on Google seems to give a lot of close-but-not-exactly results. What terms should I be looking for? edit: Just to clarify; the sub matrix need not be continuous. In fact the row and column order is completely arbitrary so adjacency is completely irrelevant. A thought based on Chad Okere's idea Order the rows from largest count to smallest count (not necessary but might help perf) Select two rows that have a "large" overlap Add all other rows that won't reduce the overlap Record that set Add whatever row reduces the overlap by the least Repeat at #3 until the result gets to small Start over at #2 with a different starting pair Continue until you decide the result is good enough

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• How do I convert some ugly inline javascript into a function?

  - by Taylor

  I've got a form with various inputs that by default have no value. When a user changes one or more of the inputs all values including the blank ones are used in the URL GET string when submitted. So to clean it up I've got some javascript that removes the inputs before submission. It works well enough but I was wondering how to put this in a js function or tidy it up. Seems a bit messy to have it all clumped in to an onclick. Plus i'm going to be adding more so there will be quite a few. Here's the relevant code. There are 3 seperate lines for 3 seperate inputs. The first part of the line has a value that refers to the inputs ID ("mf","cf","bf","pf") and the second part of the line refers to the parent div ("dmf","dcf", etc). The first part is an example of the input structure... echo "<div id='dmf'><select id='mf' name='mFilter'>"; This part is the submit and js... echo "<input type='submit' value='Apply' onclick='javascript: if (document.getElementById(\"mf\").value==\"\") { document.getElementById(\"dmf\").innerHTML=\"\"; } if (document.getElementById(\"cf\").value==\"\") { document.getElementById(\"dcf\").innerHTML=\"\"; } if (document.getElementById(\"bf\").value==\"\") { document.getElementById(\"dbf\").innerHTML=\"\"; } if (document.getElementById(\"pf\").value==\"\") { document.getElementById(\"dpf\").innerHTML=\"\"; } ' />"; I have pretty much zero javascript knowledge so help turning this in to a neater function or similar would be much appreciated.

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