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• Raw socket sendto() failure in OS X

  - by user37278

  When I open a raw socket is OS X, construct my own udp packet (headers and data), and call sendto(), I get the error "Invalid Argument". Here is a sample program "rawudp.c" from the web site http://www.tenouk.com/Module43a.html that demonstrates this problem. The program (after adding string and stdlib #includes) runs under Fedora 10 but fails with "Invalid Argument" under OS X. Can anyone suggest why this fails in OS X? I have looked and looked and looked at the sendto() call, but all the parameters look good. I'm running the code as root, etc. Is there perhaps a kernel setting that prevents even uid 0 executables from sending packets through raw sockets in OS X Snow Leopard? Thanks.

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• Is there a way to disable calls to Runtime.checkRestricted on the GAE Java development server under Eclipse?

  - by Thomas Becker

  I'm one of those guys who step through their code a lot during development. Beginning with version 1.6.4 of the GAE Java development server, the server has been instrumented with calls to a function named Runtime.checkRestricted. This causes two inconveniences when I step through my code: 1) Whenever I step into a function, the debugger goes into the function Runtime.checkRestricted (for which there is no source code) at least once, often multiple times. 2) Whenever I step over a function call which has a large call tree underneath it, then it takes a very long time for the debugger to come back. (That's always a problem in the Eclipse Java debugger, but now it's really bad.) For me, all this causes a serious drain on productivity. Is there any way to disable this instrumentation, or to prevent the debugger from stepping into it? I am using Eclipse with the GAE plugin.

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• x86 Assembly Question about outputting

  - by jdea

  My code looks like this _declspec(naked) void f(unsigned int input,unsigned int *output) { __asm{ push dword ptr[esp+4] call factorial pop ecx mov [output], eax //copy result ret } } __declspec(naked) unsigned int factorial(unsigned int n) { __asm{ push esi mov esi, dword ptr [esp+8] cmp esi, 1 jg RECURSE mov eax, 1 jmp END RECURSE: dec esi push esi call factorial pop esi inc esi mul esi END: pop esi ret } } Its a factorial function and I'm trying to output the answer after it recursively calculates the number that was passed in But what I get returned as an output is the same large number I keep getting Not sure about what is wrong with my output, by I also see this error CXX0030: Error: expression cannot be evaluated Thanks!

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• Workflow 4.0 code activities calling other activites (persist, delay etc)

  - by Lygpt

  I have a bunch of Workflow foundation 4.0 RC code activities that consume web services and talk to databases that I want to add some error handling in. I would really like to be able to attempt to call my web service / db, catch any faults such as a communication failure and then retry the same operation in 1 hours time (after I have logged the exception). Is there a way of doing something like this? protected override void Execute(CodeActivityContext context) { Persist(); // I would like to invoke the persist activity like this if (!AttemptServiceCall()) { // I would like to invoke a delay activity like this Delay(new TimeSpan(0, 30, 0)); // wait 30 mins before trying again Execute(context); // call this activity again } } private bool AttemptServiceCall() { bool serviceCallSuccessful = true; try { myService.InvokeSomeMethod(); } catch (CommunicationException ex) { myEventLogger.Log(ex); serviceCallSuccessful = false; } return serviceCallSuccessful; }

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• How can I update an expression in a Runt::Schedule object?

  - by Reid Beels

  Runt provides a Schedule class for managing collections of events, each represented by a temporal expression. The Schedule class provides an update method, cited in the release notes as "allowing clients to update existing expressions". The implementation of this method, however, simply calls a supplied block, providing the temporal expression for the specified event (as shown). # From lib/runt/schedule.rb:61 # # Call the supplied block/Proc with the currently configured # TemporalExpression associated with the supplied Event. # def update(event,&block) block.call(@elems[event]) end How is one expected to use this method to update an expression?

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• Using HTTP Vary header to decide on a strategy to process a request

  - by Jacques René Mesrine

  I have a specific REST endpoint that creates a topic in a forum; but I want to apply different strategies when processing the request. e.g. If client A makes the call, perform moderation. if client B makes the call, do something else. The easiest would be to add a query param for differentiation: POST /resource?from=xyz Another brilliant idea is to use the Vary HTTP header. POST /resource Vary: xyz Any problems with this approach ?

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• Dendrogram generated by scipy-cluster does not show

  - by Space_C0wb0y

  I am using scipy-cluster to generate a hierarchical clustering on some data. As a final step of the application, I call the dendrogram function to plot the clustering. I am running on Mac OS X Snow Leopard using the built-in Python 2.6.1 and this matplotlib package. The program runs fine, but at the end the Rocket Ship icon (as I understand, this is the launcher for GUI applications in python) shows up and vanishes immediately without doing anything. Nothing is shown. If I add a 'raw_input' after the call, it just bounces up and down in the dock forever. If I run a simple sample application for matplotlib from the terminal it runs fine. Does anyone have any experiences on this?

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• Calling ASP.NET Code Behind function from Javascript

  - by Satyaprakash J

  Hi, Is it possible to call ASP.NET codebehind function from Javascript. Thanks.

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• Rails: Skinny Controller vs. Fat Model, or should I make my Controller Anorexic?

  - by Nick Gorbikoff

  I know similar questions have been answered before - such as: Where should logic go, where to do certain tasks, etc. But I have a more specific question - How far should I take this axiom: "keep your controller skinny, make your model fat!" Here is an example: For instance let's say I have multiple source of verification data. A good example would be a VIN number - I can verify it against, manufacturers data source, DMV's data source, also my local databases - to see what I have on record. So I have a model called Vin and vins_controller. Inside the model I have 5 methods: check_against_local_db, check_against_dmv, check_against_car_maker_1, check_against_car_maker_2, etc. In my controller keeping with the REST, in action show - I have a simple case statement which looks at the params[:source], and based on source specified - will call specific check method. Now here is the question: Should I leave the logic that governs which data source to call in controller or should I move it to model and then in controller just do something like check_vin(source, vin)? Should I make my controller anorexic?

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• How to stop endless EJB 3 timer ?

  - by worldpython

  Hi, I am new to EJB 3 . I use the following code to start endless EJB 3 timer then deploying it on JBOSS 4.2.3 @Stateless public class SimpleBean implements SimpleBeanRemote,TimerService { @Resource TimerService timerService; private Timer timer ; @Timeout public void timeout(Timer timer) { System.out.println("Hello EJB"); } } then calling it timer = timerService.createTimer(10, 5000, null); It works well. I created a client class that calls a method that creates the timer and a method that is called when the timer times out. I forget to call cancel then it does not stop .redeploy with cancel call never stop it. restart Jboss 4.2.3 never stop it. How I can stop EJB timer ? Thanks for helping.

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• Controller getting NULL value?

  - by RSolberg

  I'm trying to make a call to a controller via jQuery $.post, but the parameter for my controller method keeps getting a NULL value despite it appearing to be setup similar to other controller methods. CONTROLLER [AcceptVerbs(HttpVerbs.Post)] public ActionResult SearchWeatherLocations(string searchFor) { //Do Some Magic } GLOBAL.ASAX routes.MapRoute("SearchWeatherLocations", "Home/SearchWeatherLocations/{searchFor}", new { controller = "Home", action = "SearchWeatherLocations" }); jQuery Call From View <script type="text/javascript" language="javascript"> $(document).ready(function () { GetWeatherLocations("seat"); }); function GetWeatherLocations(sSearchFor) { var divToBeWorkedOn = '#locations'; var webMethod = '<%= Url.Action("SearchWeatherLocations", "Home") %>/'; var url = webMethod + sSearchFor; $.post(url, function (data) { $('#locations').children().remove(); for (var count in data) { $('#locations').append("<li>" + data[count].LocationName + "&nbsp;(" + data[count].LocationCode + ")</li>"); } }); } </script>

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• links for 2011-02-25

  - by Bob Rhubart

  The (non) Importance of Language (Enterprise Architecture at Oracle) (tags: ping.fm entarch) ArchBeat (tags: ping.fm) Andrejus Baranovskis's Blog: Beware of Hackers - Keep ADF Task Flows inside WEB-INF Oracle ACE Director Andrejus Baranovskis with a word of caution. (tags: oracle oracleace otn adf) Introduction to WebCenter Personalization: The Conductor; (WebCenter Personalization) Steve Pepper offers an introduction to the Conductor component in Oracle WebCenter Personalization. (tags: oracle otn webcenter enterprise2.0) Batch Aggregation of files in BPEL process instances based on correlation AMIS Technology blog Oracle ACE Director Lucas Jellema shares his solution to a colleague's challenge. (tags: oracle otn oracleace soa bpel) Bradley D. Brown: Watch Out Larry...Here they Come! "Every Fortune 500 company that I've talked to in the last few months is trying to figure out their mobile strategy. Organizations are getting the push from the top down - i.e. executives are asking for data from their mobile devices." - Oracle ACE Director Brad Brown (tags: oracle otn ipad mobilecomputing entarch oracleace) Oracle Technology Network Developer Day - You are the future of Java. Boston, March 3. Designed for the enterprise professional, this event will teach you about the latest developments in the Java Virtual Machine, Java EE, Java SE, Java on the Desktop, and Embedded Java. Whether you're a developer or architect, or managing a team of them, this is an event you can't miss. (tags: oracle otn java)

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• Javascript callback on blackberry

  - by Jeff

  I'm working on a mobile project, and I have a script that is dynamically generated on the backend and then appended to the document (the html page). Desktop browsers seem to append the script correctly and call any functions in the script, however, I can't get this to happen on Blackberry phones. I know that the script is being appending because I can alert it after I append it. I just can get it to call the function in the script. For example, if I have code like this: var scriptText = document.createElement('script'); scriptText.type = 'text/javascript'; scriptText.id = 'thisScript'; scriptText.innerHTML = 'alert("hello");'; document.getElementById('idName').appendChild(scriptText); alert(document.getElementById('thisScript')); //Alerts the script element. This will alert 'hello' in desktop browsers and even the iPhone/iPodTouch, but not BlackBerry's. Anyone have any idea why? Or if there's a fix/hack?

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• Best of OTN - Week of August 17th

  - by CassandraClark-OTN

  Architect CommunityThe Top 3 most popular OTN ArchBeat video interviews of all time: Oracle Coherence Community on Java.net | Brian Oliver and Randy Stafford [October 24, 2013] Brian Oliver (Senior Principal Solutions Architect, Oracle Coherence) and Randy Stafford (Architect At-Large, Oracle Coherence Product Development) discuss the evolution of the Oracle Coherence Community on Java.net and how developers can actively participate in product development through Coherence Community open projects. Visit the Coherence Community at: https://java.net/projects/coherence. The Raspberry Pi Java Carputer and Other Wonders | Simon Ritter [February 13, 2014] Oracle lead Java evangelist Simon Ritter talks about his Raspberry Pi-based Java Carputer IoT project and other topics he presented at QCon London 2014. Hot Features in Oracle APEX 5.0 | Joel Kallman [May 14, 2014] Joel Kallman (Director, Software Development, Oracle) shares key points from his Great Lakes Oracle Conference 2014 session on new features in Oracle APEX 5.0. Friday Funny from OTN Architect Community Manager Bob Rhubart: Comedy legend Steve Martin entertains dogs in this 1976 clip from the Carol Burnette show. Database Community OTN Database Community Home Page - See all tech articles, downloads etc. related to Oracle Database for DBA's and Developers. Java Community JavaOne Blog - JRuby and JVM Languages at JavaOne!  In this video interview, Charles shared the JRuby features he presented at the JVM Language Summit. He'll be at JavaOne read the blog to see all the sessions. Java Source Blog - IoT: Wearables! Wearables are a subset of the Internet of Things that has gained a lot of attention. Learn More. I love Java FaceBook - Java Advanced Management Console demo - Watch as Jim Weaver, Java Technology Ambassador at Oracle, walks through a demonstration of the new Java Advanced Management Console (AMC) tool. Systems Community OTN Garage Blog - Why Wouldn't Root Be Able to Change a Zone's IP Address in Oracle Solaris 11? - Read and learn the answer. OTN Garage FaceBook - Securing Your Cloud-Based Data Center with Oracle Solaris 11 - Overview of the security precautions a sysadmin needs to take to secure data in a cloud infrastructure, and how to implement them with the security features in Oracle Solaris 11.

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• Communication between Page and User Controls

  - by Narmatha Balasundaram

  I have a main page that has multiple user controls on it. All the user controls have static text and some data to be retrieved from the DB. The aysnchronous DB call is clubbed at the page level and one call is made to avoid multiple calls (in the different user controls) to get the same data. I want the page and user controls to load initially with the static text and later refresh the contents obtained from the server. To sum it all up, Page Loads = Asyn calls fired on page load = Data received back from the server (XML/text/whatever) = User controls to load with this data using AJAX. What methods do I have to let the user controls know that I have the data from the server and they need to update with this data?

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• Help with Role Based Security.

  - by Bill K

  Hello, I'm trying to understand role based security and I have the following method: [PrincipalPermission(SecurityAction.Demand, Role = "Administrators")] static void Test() { //administratos only can call this code } What I wanna do is that only users that are members of the Windows Administrators group can call this code, however, if I do the following, it works: GenericIdentity genericIdentity = new GenericIdentity("test", "test"); GenericPrincipal genericPrincipal = new GenericPrincipal(genericIdentity, new string[] { "Administrators" }); AppDomain.CurrentDomain.SetThreadPrincipal(genericPrincipal); Test(); So, how can I make it work only if the user is in the Administrators windows group? thanks!

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• Loading Files in AppEngine

  - by Chris M

  I've got a tiny bit of code to display a file in app.yaml - url: /(.*\.(gif|png|jpg)) static_files: static/\1 upload: static/(.*\.(gif|png|jpg)) in main.py ... class ShowImage(webapp.RequestHandler): def get(self): rootpath = os.path.dirname(__file__) file = rootpath + "/static/tracker.gif"; fh=open(file, 'r') self.response.out.write(fh.read()) fh.close ... I can see the files gone up by going to my *.appspot.com/tracker.gif (as per the app.yaml) But using *.appspot.com/showimage returns Traceback (most recent call last): File "/base/python_lib/versions/1/google/appengine/ext/webapp/__init__.py", line 510, in __call__ handler.get(*groups) File "/base/data/home/apps/APPNAME/2.341131266814384624/main.py", line 170, in get fh=open(file, 'r') IOError: [Errno 2] No such file or directory: '/base/data/home/apps/APPNAME/2.341131266814384624/static/tracker.gif'

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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 to get obj2.name via obj1.categories(), thanks (gae python)

  - by zjm1126

  i using google-app-engine webapp ,code is : class Post(db.Model): title = db.StringProperty(required=True) def categories(self): return (x.category for x in self.postcategory_set) class Category(db.Model): name = db.StringProperty() class PostCategory(db.Model): post = db.ReferenceProperty(Post) category = db.ReferenceProperty(Category) class sss(webapp.RequestHandler): def get(self): obj1 = Post(title='hhaa') #obj1.title = 'haha' obj1.put() obj2 = Category() obj2.name='haha-kao' obj2.put() obj3=PostCategory() obj3.post=obj1 obj3.category=obj2 obj3.put() self.response.out.write(obj1.categories().get().name) the error is : Traceback (most recent call last): File "D:\Program Files\Google\google_appengine\google\appengine\ext\webapp\__init__.py", line 511, in __call__ handler.get(*groups) File "D:\zjm_code\helloworld\a.py", line 131, in get self.response.out.write(obj1.categories().get().name) AttributeError: 'generator' object has no attribute 'get' so how to get the obj2.name via obj1's method thanks

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• Why Am I Getting MySQL Error #1312 when Using a Simple Stored Procedure?

  - by Laxmidi

  Hi, I'm trying to learn how to use MySQL stored procedures. MySQL accepted my procedure: CREATE PROCEDURE SimpleProc() BEGIN SELECT * FROM myTable; END (In phpMyAdmin, I set // for delimiter. The real version has the name of an actual table instead of myTable.). But, when I call the procedure with CALL SimpleProc();, I get error "#1312 - PROCEDURE mydb.SimpleProc can't return a result set in the given context". I read that some versions of php or phpMyAdmin won't work with stored procedures. I'm using a localhost running on a Mac with MAMP 1.9. I've got MySQL 5.1.44, PHP 5.2.13 & 5.3.2, phpMyAdmin 3.2.5. Does anyone know if stored procedures will work with my set-up? Am I doing something incorrectly? Any advice? Shout out to the Big Red for a triple overtime victory in Lax. Thanks, Laxmidi

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• Having trouble with event creation using the events.create API with the iPhone SDK

  - by MahatmaManic

  I'm using the FBConnect library in my iPhone app, and I'm trying to create Facebook events. After getting a valid session and verifying permissions, I'm using events.create and getting what looks like a valid event ID back from FB in a success response. Oddly the event isn't showing up on my account's Events page either in current or in past events. I thought the problem might be that the event might not include me as an attendee so I followed the successful events.create call with an events.rsvp call to set my status to "attending". That also gets back success from FB, but I'm still not seeing anything show up. Am I missing a step? Is there something other than Create and then RSVP that I need to do, or is there an error with the api/Facebook? I don't think I'm missing any of the required fields for event creation (name and start_time) and I am populating a lot of the other fields in event_info...

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• Oracle EXECUTE IMMEDIATE changes explain plan of query.

  - by Gunny

  I have a stored procedure that I am calling using EXECUTE IMMEDIATE. The issue that I am facing is that the explain plan is different when I call the procedure directly vs when I use EXECUTE IMMEDIATE to call the procedure. This is causing the execution time to increase 5x. The main difference between the plans is that when I use execute immediate the optimizer isn't unnesting the subquery (I'm using a NOT EXISTS condition). We are using Rule Based Optimizer here at work. Example: Fast: begin package.procedure; end; / Slow: begin execute immediate 'begin package.' || proc_name || '; end;'; end; /

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• Allowing threads from python after calling a blocking i/o code in a python extension generated using

  - by SS

  I have written a python extension wrapping an existing C++ library live555 (wrapping RTSP client interface to be specific) in SWIG. The extension works when it is operated in a single thread, but as soon as I call the event loop function of the library, python interpreter never gets the control back. So if I create a scheduled task using threading.Timer right before calling the event loop, that task never gets executed once event loop starts. To fix this issue, I added Py_BEGIN_ALLOW_THREADS and Py_END_ALLOW_THREADS macros manually in the SWIG auto generated wrapper cxx file around every doEventLoop() function call. But now, I want to do the same (i.e. allow threads) when SWIG generates the code itself and not to change any code manually. Has anyone done something similar in SWIG? P.S. - I would also consider switching to any other framework (like SIP) to get this working. I selected SWIG over any other technology is because writing SWIG interface was really very easy and I just had to include the existing header files.

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• How to GetGuiResources for all system processes?

  - by Krzysztof

  Hello, I need to measure all used GDI objects in a Windows xp system. I found a GetGuiResources(__in HANDLE hProcess, __in DWORD uiFlags) method (with the GR_GDIOBJECTS flag). I call it for the process which I get from the method GetCurrentProcess() defined in WinBase.h. I don't know how to call it for other system processes, which I get by System::Diagnostics::Process::GetProcesses(), because that function returns an array of Process pointers, and GetGuiResources takes a HANDLE. Does anybody know a solution for that? How can I transform Process pointer to a Handle or get HANDLEs for all running system processes? thanks for help in advance!

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• Unable to make 2 parallel TCP requests to the same TCP Client

  - by soldieraman

  Error: Unable to read data from the transport connection: A blocking operation was interrupted by a call to WSACancelBlockingCall Situation There is a TCP Server My web application connects to this TCP Server Using the below code: TcpClientInfo = new TcpClient(); _result = TcpClientInfo.BeginConnect(<serverAddress>,<portNumber>, null, null); bool success = _result.AsyncWaitHandle.WaitOne(20000, true); if (!success) { TcpClientInfo.Close(); throw new Exception("Connection Timeout: Failed to establish connection."); } NetworkStreamInfo = TcpClientInfo.GetStream(); NetworkStreamInfo.ReadTimeout = 20000; 2 Users use the same application from two different location to access information from this server at the SAME TIME Server takes around 2sec to reply Both Connect But One of the user gets above error "Unable to read data from the transport connection: A blocking operation was interrupted by a call to WSACancelBlockingCall" when trying to read data from stream How can I resolve this issue? Use a better way of connecting to the server Can't because it's a server issue if a server issue, how should the server handle request to avoid this problem

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