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• Embed a Python persistance layer into a C++ application - good idea?

  - by Rickard

  say I'm about to write an application with a thin GUI layer, a really fat calculation layer (doing computationally heavy calibrations and other long-running stuff) and fairly simple persistance layer. I'm looking at building the GUI + calculation layer in C++ (using Qt for the gui parts). Now - would it be a crazy idea to build the persistance layer in Python, using sqlalchemy, and embed it into the C++ application, letting the layers interface with eachother through lightweigth data transfer objects (written in C++ but accessible from python)? (the other alternative I'm leaning towards would probably be to write the app in Python from the start, using the PyQt wrapper, and then calling into C++ for the computational tasks) Thanks, Rickard

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• Generating scriptaculous ajax.autocompleter on the fly

  - by user279992

  I have a form where the user can dynamically add a new table row with fields. I'm using a simple insertCell/InsertRow with innerHTML to generate the new row. One of those form fields is using scriptaculous' ajax.autocompleter. I have it generating new IDs for all the elements, but it is still not working The new row generated by js has the same source as the initial row of the form that loads at run time, however it does not appear to be calling the autocomplete function. I think my problem lies in that I don't understand when/how the "new Ajax.Autocompleter" is called. Is it not possible to use ajax.autocompleter like this? TIA

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• How can I overwrite a System.Drawing.Bitmap onto an existing GDI bitmap?

  - by MusiGenesis

  If I have a .Net Bitmap, I can create from it a GDI bitmap by calling the Bitmap's GetHbitmap() method. Bitmap bmp = new Bitmap(100, 100); IntPtr gdiBmp = bmp.GetHbitmap(); This works fine, but every time you call GetHbitmap, Windows has to allocate new memory for the object that gdiBmp references. What I'd like to do - if possible - is write a function (I know PInvoke will be necessary here) that also generates a GDI bitmap copy of a Bitmap, but that uses an existing object instead of allocating a new one. So it would look something like this (if it were an extension method of Bitmap): //void OverwriteHbitmap(IntPtr gdi) Bitmap bmp1 = new Bitmap(100, 100); IntPtr gdi1 = bmp1.GetHbitmap(); Bitmap bmp2 = new Bitmap(100, 100); bmp2.OverwriteHbitmap(gdi1); How can I do this? I assume I'll need to know the structure of a GDI bitmap, and probably I can use LockBits and BitmapData for this, but I'm not sure exactly how.

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• Java Timers - Functions called not completing!

  - by Matt Swanson

  So I have a TimerTask task calling a function onTimerComplete() in its run() onTimerComplete() looks something like this: private void onTimerComplete(){ myFunc1(); myFunc2(); } I make a Timer t and I schedule the TimerTask with t.schedule(task, 2000); The problem is, when the timer is up and the task runs my onTimerComplete() but that function does not finish. It runs myFunc1() but never finishes it nor does it ever call myFunc2() However, if I call onTimerComplete() directly, everything works. What's the deal here?

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• Handling messages for window from other process

  - by MK

  I'm developing a C# WPF application that reparents the main window of another application using a call to Win32 SetParent(). The handle to this out-of-process child window is wrapped by a class named FormHost which is derived from HwndHost. All is working well except for one thing: messages for the reparented window are not delivered to FormHost. MSDN documentation clearly states that the HwndHost window procedure WndProc() cannot be used with out-of-process windows. The alternative, MessageHook doesn't work either. I also tried calling AttachThreadInput() to combine the input processing of the two windows. No luck. Any suggestions?

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• rails - named scoped help

  - by sameera207

  Hi All, I want to write a named scoped to get a record from its id. Ex: I have a model called Event and its same as doing Event.find(id) (I dont want to use find inside my controller and I want my controller to use a named scoped (for future flexibility)) So I have written a named scoped named_scope :from_id, lambda { |id| {:conditions = ['id= ?', id] } } and I'm calling it from my controller like Event.from_id(id) But my problems is it returns Event object array not only one object Ex: if I want to get event name I have to write event = Event.from_id(id) event[0].name instead I want to write event = Event.from_id(id) event.name Am I doing something wrong here.. thanks in advance cheers sameera

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• Read and write from a byte stream if the endianess of the data is different from that of the current

  - by Sam Holder

  I have a stream of bytes which contains a flag which identifies the endianness of the data in the header. I want to read the doubles from the stream, which will presumably need to be different if the endianness of the data in the header is different? I am currently using a BinaryReader and calling ReadDouble to read the data from the stream, but if the endianness flag indicates that the data stream has a different endianness than the machine architecture then presumably this will not work? How should this be handled? Should I check the endianness of my data against that of the current machine then when I want to read a double instead read the bytes raw into a byte array and do array.Reverse to reverse the data before using BitConverter.ToDouble () with the reversed data and a zero offset? I could just test this but I do not have a source of data for both endianness so am a bit concerned about creating test data to test the parsing and this being different from what 'real' data might look like.

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• Authentication on odata service

  - by Toad

  I want to add some authentication to my odata service. Depending on the user calling i want to: filter rows and/or remove columns. I read in scott hanselmans fine blogpost on odata ( http://www.hanselman.com/blog/CreatingAnODataAPIForStackOverflowIncludingXMLAndJSONIn30Minutes.aspx )that it is possible to intercept the incoming queries. If this works i could add some extra filtering. How would this intercepting and altering queries work exactly? I can not find any examples of where and how to do this. (i'm using entitie framework and wcf dataservices (just like scotts example blog)

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• Scalaz Kleisli question

  - by oxbow_lakes

  There is a trait called Kleisli in the scalaz library. Looking at the code: import scalaz._ import Scalaz._ type StringPair = (String, String) val f: Int => List[String] = (i: Int) => List((i |+| 1).toString, (i |+| 2).toString) val g: String => List[StringPair] = (s: String) => List("X" -> s, s -> "Y") val k = kleisli(f) >=> kleisli(g) //this gives me a function: Int => List[(String, String)] Calling the function k with the value of 2 gives: println( k(2) ) //Prints: List((X,3), (3,Y), (X,4), (4,Y)) My question is: how would I use Scalaz to combine f and g to get a function m such that the output of m(2) would be: val m = //??? some combination of f and g println( m(2) ) //Prints: List((X,3), (X,4), (3,Y), (4,Y)) Is this even possible?

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• How does delete deal with pointer constness?

  - by aJ

  I was reading this question Deleting a const pointer and wanted to know more about delete behavior. Now, as per my understanding: delete expression works in two steps: invoke destructor then releases the memory (often with a call to free()) by calling operator delete. operator delete accepts a void*. As part of a test program I overloaded operator delete and found that operator delete doesn't accept const pointer. Since operator delete does not accept const pointer and delete internally calls operator delete, how does Deleting a const pointer work ? Does delete uses const_cast internally?

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• Replacing a calloutaccessoryview in mkannotationview

  - by Mugunth Kumar

  In my viewForAnnotation delegate, I create a MKAnnotationView with leftCalloutaccessory as a info button. When the info button is tapped, I want to replace it with a UIActivityIndicator. So in the calloutAccessoryTapped delegate, I wrote view.leftCalloutaccessoryView = [UIActivityIndicator indicatorWithStyle:UIActivityIndicatorWhite]; The callout accessory seems to change, but it seems like the view doesn't get updated immediately. That's when the callout accessory gets hidden (by tapping another pin) and is re-opened, I see a spinner. But otherwise, I don't. I tried calling [view setNeedsdisplay] and [view setNeedsLayout] and [view layoutsubviews] as well but in vain. Any suggestions/pointers?

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• capture any error in VBScript?

  - by JoelFan

  I have a batch file that calls a VBScript (.vbs) program. After calling it, my batch script checks errorlevel to see if the .vbs program failed. I can signal failure with an exit code in the .vbs program with WScript.Quit(1). However, I can only do that explicitly. If some unexpected run-time error happens, the .vbs quits with an error dialog box, however the exit code is zero so my batch file thinks it suceeded! How can I change that behavior? And if you are thinking of saying, use on error goto, don't bother... that syntax is available in regular VB, but not in VBScript.

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• Problems with MVC Ajax.ActionLink and returning a PartialView

  - by mwright

  I'm trying to implement a simple Ajax update using MVC and have run into an issue. My understanding of how to implement Ajax with MVC is to use an Ajax.ActionLink which allows the content to be updated based on user interaction. I have an Ajax.ActionLink that looks like the following: <%= Ajax.ActionLink("Call Ajax", "Ajax", new AjaxOptions{UpdateTargetId = "updateDiv"}) %> If, in the controller, I return a string it works fine. However, when returning a PartialView instead, nothing happens. I can step through and verify that the controller is "returning" the partial view but nothing shows up in what I'm calling the updateDiv. How can I go about determining what the problem is?

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• PInvokeStackImbalance was detected when manually running Xna Content pipeline

  - by Miau

  So I m running this code static readonly string[] PipelineAssemblies = { "Microsoft.Xna.Framework.Content.Pipeline.FBXImporter" + XnaVersion, "Microsoft.Xna.Framework.Content.Pipeline.XImporter" + XnaVersion, "Microsoft.Xna.Framework.Content.Pipeline.TextureImporter" + XnaVersion, "Microsoft.Xna.Framework.Content.Pipeline.EffectImporter" + XnaVersion, "Microsoft.Xna.Framework.Content.Pipeline.XImporter" + XnaVersion, "Microsoft.Xna.Framework.Content.Pipeline.AudioImporters" + XnaVersion, "Microsoft.Xna.Framework.Content.Pipeline.VideoImporters" + XnaVersion, }; more code in between ..... // Register any custom importers or processors. foreach (string pipelineAssembly in PipelineAssemblies) { _buildProject.AddItem("Reference", pipelineAssembly); } more code in between ..... var execute = Task.Factory.StartNew(() => submission.ExecuteAsync(null, null), cancellationTokenSource.Token); var endBuild = execute.ContinueWith(ant => BuildManager.DefaultBuildManager.EndBuild()); endBuild.Wait(); Basically trying to build the content project with code ... this works well if you remove XImporter, AudioIMporters and VideoImporters but with those I get the following error: PInvokeStackImbalance was detected Message: A call to PInvoke function 'Microsoft.Xna.Framework.Content.Pipeline!Microsoft.Xna.Framework.Content.Pipeline.UnsafeNativeMethods+AudioHelper::GetFormatSize' has unbalanced the stack. This is likely because the managed PInvoke signature does not match the unmanaged target signature. Check that the calling convention and parameters of the PInvoke signature match the target unmanaged signature. Things I've tried: turn unsafe code on adding a lot of logging (the dll is found in case you are wondering) different wav and Mp3 files (just in case) Will update...

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• htaccess not called when the url point to an existing folder

  - by Eldad

  Hi, I'm running zend server on windows 7. I'm using the htaccess from jooml: Options +FollowSymLinks RewriteEngine On RewriteCond %{QUERY_STRING} mosConfig_[a-zA-Z_]{1,21}(=|\%3D) [OR] RewriteCond %{QUERY_STRING} base64_encode.*\(.*\) [OR] RewriteCond %{QUERY_STRING} (\<|%3C).*script.*(\>|%3E) [NC,OR] RewriteCond %{QUERY_STRING} GLOBALS(=|\[|\%[0-9A-Z]{0,2}) [OR] RewriteCond %{QUERY_STRING} _REQUEST(=|\[|\%[0-9A-Z]{0,2}) RewriteRule ^(.*)$ index.php [F,L] RewriteCond %{REQUEST_FILENAME} !-f RewriteCond %{REQUEST_FILENAME} !-d RewriteCond %{REQUEST_URI} !^/index.php RewriteCond %{REQUEST_URI} (/|\.php|\.html|\.htm|\.feed|\.pdf|\.raw|/[^.]*)$ [NC] RewriteRule (.*) index.php RewriteRule .* - [E=HTTP_AUTHORIZATION:%{HTTP:Authorization},L] when I'm calling this url: http://localhost/ABC/ the data is been redirect to index.php but if I'm creating the folder ABC the server is showing the ABC folder content and not redirecting the data back to index.php. how can I prevent that, I want all the calls data to be directed into index.php? Thanks

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• unable to connect to Mailchimp services using java wrapper

  - by Nagesh

  I am using Java wrapper of mailchimp API for converting to inline CSS. I downloaded the java wrapper and tried with method inlineCss(); I register with Mailchimp and got the Api key. API Key: d5296efe2d4879e90d95b151804f8d30-us1 I am getting the below exception while calling the ping(apiKey) method. Could you please provide me the solution to resolve this problem. Exception in thread "main" com.nwire.mailchimp.MailChimpServiceException: Failed to read servers response: api.mailchimp.com at com.nwire.mailchimp.MailChimpServiceFactory$ClientFactory$1.invoke(MailChimpServiceFactory.java:190) at $Proxy0.ping(Unknown Source) at com.nwire.mailchimp.test.InlineTest.initialize(InlineTest.java:44) at com.nwire.mailchimp.test.InlineTest.run(InlineTest.java:36) at com.nwire.mailchimp.test.InlineTest.main(InlineTest.java:23) Below is the code I am using for connecting to Mailchimp. public void initialize() { mcServices = MailChimpServiceFactory.getMailChimpServices(); final String ping = mcServices.ping(apiKey); if (IMailChimpServices.PING_SUCCESS.equals(ping)) { logger.error("MailChimp connection pinged successfully"); } else { logger.error("Failed to ping MailChimp, response: " + ping); } } Regards, Nagesh.

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• Equals method of System.Collections.Generic.List<T>...?

  - by Sambo

  I'm creating a class that derives from List... public class MyList : List<MyListItem> {} I've overridden Equals of MyListItem... public override bool Equals(object obj) { MyListItem li = obj as MyListItem; return (ID == li.ID); // ID is a property of MyListItem } I would like to have an Equals method in the MyList object too which will compare each item in the list, calling Equals() on each MyListItem object. It would be nice to simply call... MyList l1 = new MyList() { new MyListItem(1), new MyListItem(2) }; MyList l2 = new MyList() { new MyListItem(1), new MyListItem(2) }; if (l1 == l2) { ... } ...and have the comparisons of the list done by value. What's the best way...?

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• Creating a Cross-Process EventWaitHandle

  - by Navaneeth

  I have two windows application, one is a windows service which create EventWaitHandle and wait for it. Second application is a windows gui which open it by calling EventWaitHandle.OpenExisting() and try to Set the event. But I am getting an exception in OpenExisting. The Exception is "Access to the path is denied". windows Service code EventWaitHandle wh = new EventWaitHandle(false, EventResetMode.AutoReset, "MyEventName"); wh.WaitOne(); Windows GUI code try { EventWaitHandle wh = EventWaitHandle.OpenExisting("MyEventName"); wh.Set(); } catch (Exception ex) { MessageBox.Show(ex.Message); } I tried the same code with two sample console application, it was working fine.

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• What should I use for the filepath if I'm developing from my desktop?

  - by codeninja

  I'm having an extremely difficulty time getting the flowplayer to show up and the worst part is I have no idea what is wrong because I'm not getting any error messages! I have an external javascript file: C:/desktop/mysite/js/jq/plugins.js calling $f() from: C:/desktop/mysite/thirdparty/flowplayer/flowplayer.js the swf files also live there... I'm working on file/desktop (no localhost or webserver) $(video.id).flowplayer("thirdparty/flowplayer/flowplayer-3.1.15.swf", { clip:{ .... }, // min Flash version version:[9,115], // older versions will see a custom message onFail:function(){ alert("Failed!"); }, onError:function(errCode,errMsg){ alert(errCode+errMsg); } }); I don't know what path to use for the SWFs to get them to load, is the path relative to the javascript (plugins.js) that calls $f() or is it relative to the path of the flowplayer.js ?? bangs head on wall

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• Invalidating ASP.NET FormsAuthentication server side

  - by Rob Walker

  I am experimenting with FormsAuthentication (using ASP.NET MVC2) and it is working fairly well. However, one case I can't work out how to deal with is validating the user identity on the server to ensure it is still valid from the server's perspective. eg. User logs in ... gets a cookie/ticket Out of band the user is deleted on the server side User makes a new request to the server. HttpContext.User.Identity.Name is set to the deleted user. I can detect this fine, but what is the correct way to handle it? Calling FormsAuthentication.SignOut in the OnAuthorization on OnActionExecuting events is too late to affect the current request. Alternatively I would like to be able to calls FormsAuthentication.InvalidateUser(...) when the user is deleted (or database recreated) to invalidate all tickets for a given (or all) users. But I can't find an API to do this.

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• JPA Cascade delete.

  - by Win Man

  Hi, I am new to JPA/Hibernate. Currently using EJB3, Hibernate/JPA. I have an inheritacnce structure as follows.. @Entity @DiscriminatorColumn(name = "form_type") @Inheritance(strategy = InheritanceType.JOINED) @GenericGenerator(name = "FORMS_SEQ", strategy = "sequence-identity", parameters = @Parameter(name = "sequence", value = "FORMS_SEQ")) @Table(name = "Forms") public abstract class Form{ //code for Form } @Entity @Table(name = "CREDIT_CARDS") @PrimaryKeyJoinColumn(name="CREDIT_CARD_ID") public class CreditCardForm extends Form { //Code for CreditCards. } When I add a row with save the rows are properly inserted into the parent and the child table. However when I try to delete I get an error - 10:19:35,465 ERROR [TxPolicy] javax.ejb.EJBTransactionRolledbackException: Removing a detached instance com.data.entities.form.financial.CreditCard#159? I am using a simple for loop to determine the inheritance type - CreditCard or DebitCard and then calling entityManager.remove(entity). What am I doing wrong? Code for delete.. for(Form content: contents){ if(content.getType()==Type.CREDIT_CARD){ creditCardService.delete((CreditCard)content); } Thanks. WM

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• get the response of a jquery ajax call as an input parameter of another function:

  - by Nauman Bashir

  Hello, Is it possible to make a jquery ajax call, and get the response as an input parameter of another function: here is an example, i have the following function call at a location: updateTips(validationTextObject,objUsers.fetchAvailable()); the objUsers.fetchAvailable() function makes a ajax call to the server. The callback function on successful call would be something like this. It is being used to process the result BHUsers.prototype.recvAvailable= function(response){ // some kind of processing over here return (response["status"] == "OK")? "Available" : "Not Available"; } I want that fuction to return the processed result which can be used as a parameter to the function updateTips The primary goal of this is to be able to do all of this for multiple scenarios, rather than writing multiple functions for the same call. Also i want the calling and the response processing functions to just do what they are doing. I dont want to add html objects into it. Any Clues?

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• How can I render a list of objects using DisplayFor but from the controller in ASP.NET MVC?

  - by Darragh

  Here's the scenaio, I have an Employee object and a Company object which has a list of employees. I have Company.aspx which inherits from ViewPage<Company>. In Company.aspx I call Html.DisplayFor(m => m.Employees). I have an Employee.ascx partial view which inherits from ViewUserControl<Employee in my DisplayTemplates folder. Everything works fine and Company.aspx renders the Employee.ascx partial for each employee. Now I have two additional methods on my controller called GetEmployees and GetEmployee(Id). In the GetEmployee(Id) action I want to return the markup to display this one employee, and in GetEmployees() I want to render the markup to display all the employees (these two action methods will be called via AJAX). In the GetEmployee action I call return PartialView("DisplayTemplates\Employee", employee) This works, although I'd prefer something like return PartialViewFor(employee) which would determine the view name by convention. Anwyay, my question is how should I implement the GetEmployees() action? I don't want to create any more views, because frankly, I don't see why I should have to. I've tried the following which fails miserably :) return Content(New HtmlHelper<IList<Of DebtDto>>(null, null).DisplayFor(m => debts)); However if I could create an instance of an HtmlHelper object in my controller, I suppose I could get it to work, but it feels wrong. Any ideas? Have i missed something obvious?

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• How to Use an Environment Variable as an Environment Variable Name

  - by Synetech inc.

  Hi, In my pursuit of a solution to another environment-variable/batch-file related problem, I have once again come across a problem I have visited before (but cannot for the life of me remember how, or even if I solved it). Say you have two BAT files (or one batch file and the command line). How can one pass an environment variable name to the other so that it can read the variable? The following example does not work: A.BAT: @call b.bat path B.BAT: @echo %%1% > A.BAT > %1 > B.BAT path > %1 It is easy enough to pass the environment variable name, but the callee cannot seem to use it. (I don’t remember if or how I dealt with this the last time it came up, but I suspect it required the less-than-ideal use of redirecting temporary BAT files and calling them and such.) Any ideas? Thanks.

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• How to improve my Python regex syntax?

  - by FarmBoy

  I very new to Python, and fairly new to regex. (I have no Perl experience.) I am able to use regular expressions in a way that works, but I'm not sure that my code is particularly Pythonic or consise. For example, If I wanted to read in a text file and print out text that appears directly between the words 'foo' and 'bar' in each line (presuming this occurred one or zero times a line) I would write the following: fileList = open(inFile, 'r') pattern = re.compile(r'(foo)(.*)(bar)') for line in fileList: result = pattern.search(line) if (result != None): print result.groups()[1] Is there a better way? The if is necessary to avoid calling groups() on None. But I suspect there is a more concise way to obtain the matching String when there is one, without throwing errors when there isn't. I'm not hoping for Perl-like unreadability. I just want to accomplish this common task in the commonest and simplest way.

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