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• Sorting Arrays by More the One Value, and Prioritizing the Sort based on Column data.

  - by Mark Tomlin

  I'm looking for a way to sort an array (we call this a row), with an array of values (that I'll call columns). Each row has columns that must be sorted based on the priority of: timetime, lapcount & timestamp. Each column cotains this information: split1, split2, split3, laptime, lapcount, timestamp. laptime if in hundredths of a second. (1:23.45 or 1 Minute, 23 Seconds & 45 Hundredths is 8345.) Lapcount is a simple unsigned tiny int, or unsigned char. timestamp is unix epoch. The lowest laptime should be at the get a better standing in this sort. Should two peoples laptimes equal, then timestamp will be used to give the better standing in this sort. Should two peoples timestamp equal, then the person with less of a lapcount get's the better standing in this sort. By better standing, I mean closer to the top of the array, closer to the index of zero where it a numerical array. I think the array sorting functions built into php can do this with a callback, I was wondering what the best approch was for a weighted sort like this would be.

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• C# Inheritence: Choosing what repository based on type of inherited class

  - by Oskar Kjellin

  I have been making a program that downloads information about movies from the internet. I have a base class Title, which represents all titles. Movie, Serie and Episode are inherited from that class. To save them to the database I have 2 services, MovieService and SerieService. They in turn call repositories, but that is not important here. I have a method Save(Title title) which I am not very happy with. I check for what type the title is and then call the correct service. I would like to perhaps write like this: ITitleService service = title.GetService(); title.GetSavedBy(service); So I have an abstract method on Title that returns an ITitleSaver, which will return the correct service for the instance. My question is how should I implement ITitleSaver? If I make it accept Title I will have to cast it to the correct type before calling the correct overload. Which will lead to having to deal with casting once again. What is the best approach to dealing with this? I would like to have the saving logic in the corresponding class.

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• large amount of data in many text files - how to process?

  - by Stephen

  Hi, I have large amounts of data (a few terabytes) and accumulating... They are contained in many tab-delimited flat text files (each about 30MB). Most of the task involves reading the data and aggregating (summing/averaging + additional transformations) over observations/rows based on a series of predicate statements, and then saving the output as text, HDF5, or SQLite files, etc. I normally use R for such tasks but I fear this may be a bit large. Some candidate solutions are to 1) write the whole thing in C (or Fortran) 2) import the files (tables) into a relational database directly and then pull off chunks in R or Python (some of the transformations are not amenable for pure SQL solutions) 3) write the whole thing in Python Would (3) be a bad idea? I know you can wrap C routines in Python but in this case since there isn't anything computationally prohibitive (e.g., optimization routines that require many iterative calculations), I think I/O may be as much of a bottleneck as the computation itself. Do you have any recommendations on further considerations or suggestions? Thanks

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• Dynamically load Jquery into .js page

  - by RussP

  Please excuse me if I'm simple here, I want to create a simple widget that people can access from their websites - e.g by copy/past something like <script language="javascript" src="test2.js"></script> <div id="test"></div> anywhere in their web pages. where is dynamically filled via Jquery and the functions in/on test2.js. I can do it if JQuery is actually "printed" on the page of test2.js, but I cannot get any JQuery functions to work if I try to include/call JQuery dynamically. How do you call JQuery via javascript and then get it to work with the functions on the page? And/Or is there an easy way to add the <div id="test"></div> dynamically aswell? Sure I can body.append etc. but that only adds at the bottom of the page. Is there a way to .append in the position where the script include <script language="javascript" src="test2.js"></script> is actually placed? Hope I make sence.

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• handling java exception

  - by Noona

  This questions is related to java exception, why are there some cases that when an exception thrown the program exits even though the exception was caught and there was no exit() statement? my code looks something like this void bindProxySocket(DefaultHttpClientConnection proxyConnection, String hostName, HttpParams params) { if (!proxyConnection.isOpen()) { Socket socket = null; try { socket = new Socket(hostName, 80); } catch (UnknownHostException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } try { proxyConnection.bind(socket, params); } catch(IOException e) { System.err.println ("couldn't bind socket"); e.printStackTrace(); } } } and then I call this method like this: bindProxySocket(proxyConn, hostName, params1); but, the program exits, although I want to handle the exception by doing something else, can it be because I didn't enclose the method call within a try catch clause? what happens if I catch the exception again even though it's already in the method? and what should I do if i want to clean resources only if an exception occurs and otherwise I want to continue with the program? I am guessing in this case I have to include the whole piece of code until I can clean the resources with in a try statement or can I do it in the handle exception statement? some of these questions are on this specific case, but I would like to get a thorough answer to all my questions for future reference. thanks

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• C question: error: expected ')' before '*' token

  - by lhw

  ===EDIT I apologize for not putting the pcb struct into the code snippet. There is a struct called pcb defined in above the two structs I originally posted. Namely, typedef struct{ UINT32 proc; struct pcb *link; }pcb; Hi, I asked a question regarding structs in C a few minutes ago and got an answer blazing fast. But now I'm facing another problem, namely the error in the title of this question. I'm trying to implement a simple priority queue in C using arrays of queues. However, when I try to declare a function on pcb_pQ structure, I get the above error. I have the structs clearly defined in the heard file. In the header file: typedef struct{ pcb *head; pcb *tail; SINT32 size; } pcb_Q; typedef struct pcb_pQ { pcb_Q queues[5]; SINT32 size; } pcb_pQ; Function prototype in header file: /*priority queue operations*/ VOID pcb_pq_enqueue(pcb_pQ*, pcb*); Function impelmentation in .c file: VOID pcb_pq_enqueue(pcb_pQ* pcb_pQ, pcb* pcb) { pcb_Q* pcb_Q_p; int priority; priority = pcb->proc_priority; pcb_Q_p = &pcb_pQ->queues[priority]; pcb_enqueue(pcb_Q_p, pcb); } When I try to compile the above code, I get an "error: expected ')' before '*' token". This error is pointing to the function signature in the .c file, namely VOID pcb_pq_enqueue(pcb_pQ* pcb_pQ, pcb* pcb) { But I am not sure why I am getting this error, could someone give me a hand? Thanks a lot.

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• Restrict access to connection pool in Weblogic?

  - by Andrew White

  In short, how can I restrict access to connection pool X based on application name or JAR name? A simple use case might help... A business web-app (call it WEB_APP_A) uses pool Y to do basic look-up SQL. Some users of this web-app have access to also update some sensitive data in the database. This code is provided by a JAR file (call it HR_JAR) that can be dropped in where needed. This JAR uses pool X for all of it's connections. We don't want developers of WEB_APP_A using pool X. We only want HR_JAR using pool X. This is to keep devs of WEB_APP_A from accidentally or intentionally abusing the access pool X provides. Some considerations: This is legacy code so HR_JAR is here to stay We are running on Weblogic 9.2 We can not keep passwords in any from in the source code We have researched weblogic user level authn/authz for JDBC resources but then this begs the question; how do we secure the user creds we use to become a user per app/jar? Ideas? Thoughts? I can elaborate more on what I have tried, but I wanted fresh ideas.

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• Using Build Manager Class to Load ASPX Files and Populate its Controls

  - by Sandhurst

  I am using BuildManager Class to Load a dynamically generated ASPX File, please note that it does not have a corresponding .cs file. Using Following code I am able to load the aspx file, I am even able to loop through the control collection of the dynamically created aspx file, but when I am assigning values to controls they are not showing it up. for example if I am binding the value "Dummy" to TextBox control of the aspx page, the textbox remains empty. Here's the code that I am using protected void Page_Load(object sender, EventArgs e) { LoadPage("~/Demo.aspx"); } public static void LoadPage(string pagePath) { // get the compiled type of referenced path Type type = BuildManager.GetCompiledType(pagePath); // if type is null, could not determine page type if (type == null) throw new ApplicationException("Page " + pagePath + " not found"); // cast page object (could also cast an interface instance as well) // in this example, ASP220Page is a custom base page System.Web.UI.Page pageView = (System.Web.UI.Page)Activator.CreateInstance(type); // call page title pageView.Title = "Dynamically loaded page..."; // call custom property of ASP220Page //pageView.InternalControls.Add( // new LiteralControl("Served dynamically...")); // process the request with updated object ((IHttpHandler)pageView).ProcessRequest(HttpContext.Current); LoadDataInDynamicPage(pageView); } private static void LoadDataInDynamicPage(Page prvPage) { foreach (Control ctrl in prvPage.Controls) { //Find Form Control if (ctrl.ID != null) { if (ctrl.ID.Equals("form1")) { AllFormsClass cls = new AllFormsClass(); DataSet ds = cls.GetConditionalData("1"); foreach (Control ctr in ctrl.Controls) { if (ctr is TextBox) { if (ctr.ID.Contains("_M")) { TextBox drpControl = (TextBox)ctr; drpControl.Text = ds.Tables[0].Rows[0][ctr.ID].ToString(); } else if (ctr.ID.Contains("_O")) { TextBox drpControl = (TextBox)ctr; drpControl.Text = ds.Tables[1].Rows[0][ctr.ID].ToString(); } } } } } } }

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• NSUndoManager with Core Data - Redo not working

  - by CJ

  I have a Core Data document-based app which support undo/redo via the built-in NSUndoManager associated with the NSManagedObjectContext. I have a few actions set up which perform numerous tasks within Core Data, wrap all these tasks into an undo group via beginUndoGrouping/endUndoGrouping, and are processed by the NSUndoManager. Undo works fine. I can perform several successive actions, and each then undo each one of them successively and my app's state is maintained correctly. However, the "Redo" menu item is never enabled. This means that the NSUndoManager is telling the menu that there are no items to redo. I am wondering why the NSUndoManager is seemingly forgetting about items once they are undone, and not allowing redos to occur? One thing I should mention is that I'm disabling undo registration after a document is opened/created. When I perform an action, I call enableUndoRegistration, beginUndoGrouping, perform the action, then call processPendingChanges, setActionName:, endUndoGrouping, and finally disableUndoRegistration. This makes sure that only specific actions are undoable, and any other data changes I make outside of these go unnoticed to the NSUndoManager. This may be a part of the issue, but if so I'm wondering why it's affecting redo? Thanks in advance.

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• Linq to SQL generates StackOverflowException in tight Insert loop

  - by ChrisW

  I'm parsing an XML file and inserting the rows into a table (and related tables) using LinqToSQL. I parse the XML file using LinqToXml into IEnumerable. Then, I create a foreach loop, where I build my LinqToSQL objects and call InsertOnSubmit and SubmitChanges at the end of each loop. Nothing special here. Usually, I make it through around 4,100 records before receiving a StackOverflowException from LinqToSql, right as I call SubmitChanges. It's not always on 4,100... sometimes it's 4102, sometimes, less, etc. I've tried inserting the records that generate the failure individually, but putting them in their own Xml file, but that inserts fine... so it's not the data. I'm running the whole process from an MVC2 app that is uploading the Xml file to the server. I've adjusted my WebRequest timeouts to appropriate values, and again, I'm not getting timeout errors, just StackOverflowExceptions. So is there some pattern that I should follow for times when I have to do many insertions into the database? I never encounter this exception on smaller Xml files, just larger ones.

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• Why is it assumed that send may return with less than requested data transmitted on a blocking socke

  - by Ernelli

  The standard method to send data on a stream socket has always been to call send with a chunk of data to write, check the return value to see if all data was sent and then keep calling send again until the whole message has been accepted. For example this is a simple example of a common scheme: int send_all(int sock, unsigned char *buffer, int len) { int nsent; while(len 0) { nsent = send(sock, buffer, len, 0); if(nsent == -1) // error return -1; buffer += nsent; len -= nsent; } return 0; // ok, all data sent } Even the BSD manpage mentions that ...If no messages space is available at the socket to hold the message to be transmitted, then send() normally blocks... Which indicates that we should assume that send may return without sending all data. Now I find this rather broken but even W. Richard Stevens assumes this in his standard reference book about network programming, not in the beginning chapters, but the more advanced examples uses his own writen (write all data) function instead of calling write. Now I consider this still to be more or less broken, since if send is not able to transmit all data or accept the data in the underlying buffer and the socket is blocking, then send should block and return when the whole send request has been accepted. I mean, in the code example above, what will happen if send returns with less data sent is that it will be called right again with a new request. What has changed since last call? At max a few hundred CPU cycles have passed so the buffer is still full. If send now accepts the data why could'nt it accept it before? Otherwise we will end upp with an inefficient loop where we are trying to send data on a socket that cannot accept data and keep trying, or else? So it seems like the workaround, if needed, results in heavily inefficient code and in those circumstances blocking sockets should be avoided at all an non blocking sockets together with select should be used instead.

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• cant get connexion using MongoTor

  - by Abdelouahab Pp

  i was trying to change my code to make it asynchronous using MongoTor here is my simple code: class BaseHandler(tornado.web.RequestHandler): @property def db(self): if not hasattr(self,"_db"): _db = Database.connect('localhost:27017', 'essog') return _db @property def fs(self): if not hasattr(BaseHandler,"_fs"): _fs = gridfs.GridFS(self.db) return _fs class LoginHandler(BaseHandler): @tornado.web.asynchronous @tornado.gen.engine def post(self): email = self.get_argument("email") password = self.get_argument("pass1") try: search = yield tornado.gen.Task(self.db.users.find, {"prs.mail":email}) .... i got this error: Traceback (most recent call last): File "C:\Python27\lib\site-packages\tornado-2.4.post1-py2.7.egg\tornado\web.py", line 1043, in _stack_context_handle_exception raise_exc_info((type, value, traceback)) File "C:\Python27\lib\site-packages\tornado-2.4.post1-py2.7.egg\tornado\web.py", line 1162, in wrapper return method(self, *args, **kwargs) File "C:\Python27\lib\site-packages\tornado-2.4.post1-py2.7.egg\tornado\gen.py", line 122, in wrapper runner.run() File "C:\Python27\lib\site-packages\tornado-2.4.post1-py2.7.egg\tornado\gen.py", line 365, in run yielded = self.gen.send(next) File "G:\Mon projet\essog\handlers.py", line 92, in post search = yield tornado.gen.Task(self.db.users.find, {"prs.mail":email}) File "G:\Mon projet\essog\handlers.py", line 62, in db _db = Database.connect('localhost:27017', 'essog') File "build\bdist.win-amd64\egg\mongotor\database.py", line 131, in connect database.init(addresses, dbname, read_preference, **kwargs) File "build\bdist.win-amd64\egg\mongotor\database.py", line 62, in init ioloop_is_running = IOLoop.instance().running() AttributeError: 'SelectIOLoop' object has no attribute 'running' ERROR:tornado.access:500 POST /login (::1) 3.00ms and, excuse me for this other question, but how do i make distinct in this case? here is what worked in blocking mode: search = self.db.users.find({"prs.mail":email}).distinct("prs.mail")[0] Update: it seems that this error happenes when there is no Tornado running! it's the same error raised when using only the module in console. test = Database.connect("localhost:27017", "essog") --------------------------------------------------------------------------- AttributeError Traceback (most recent call last) in () ---- 1 test = Database.connect("localhost:27017", "essog") C:\Python27\lib\site-packages\mongotor-0.0.10-py2.7.egg\mongotor\database.pyc in connect(cls, addresses, dbname, read_preference, **kwargs) 131 132 database = Database() -- 133 database.init(addresses, dbname, read_preference, **kwargs) 134 135 return database C:\Python27\lib\site-packages\mongotor-0.0.10-py2.7.egg\mongotor\database.pyc in init(self, addresses, dbname, read_preference, **kwargs) 60 self._nodes.append(node) 61 --- 62 ioloop_is_running = IOLoop.instance().running() 63 self._config_nodes(callback=partial(self._on_config_node, ioloop_is_running)) 64 AttributeError: 'SelectIOLoop' object has no attribute 'running'

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• What is the prefered or accepted method for testing proxy settings?

  - by Mike Webb

  I have a lot of trouble with the internet connectivity in the program I am working on and it all seems to spawn from some issue with the proxy settings. Most of the issues at this point are fixed, but the issue I am having now is that my method of testing the proxy settings makes some users wait for long periods of time. Here is what I do: System.Net.WebClient webClnt = new System.Net.WebClient(); webClnt.Proxy = proxy; webClnt.Credentials = proxy.Credentials; byte[] tempBytes; try { tempBytes = webClnt.DownloadData(url.Address); } catch { //Invalid proxy settings //Code to handle the exception goes here } This is the only way that I've found to test if the proxy settings are correct. I tried making a web service call to our web service, but no proxy settings are needed when making the call. It will work even if I have bogus proxy settings. The above method, though, has no timeout member that I can set that I can find and I use the DownloadData as opposed to the DownloadDataAsync because I need to wait til the method is done so that I can know if the settings are correct before continuing on in the program. Any suggestions on a better method or a work around for this method is appreciated. Mike

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• implementing Ws-security within WCF proxy

  - by harrisonmeister

  Hi, I have imported an axis based wsdl into a VS 2008 project as a service reference. I need to be able to pass security details such as username/password and nonce values to call the axis based service. I have looked into doing it for wse, which i understand the world hates (no issues there) I have very little experience of WCF, but have worked how to physically call the endpoint now, thanks to SO, but have no idea how to set up the SoapHeaders as the schema below shows: <S:Envelope xmlns:S="http://www.w3.org/2001/12/soap-envelope" xmlns:ws="http://schemas.xmlsoap.org/ws/2002/04/secext"> <S:Header> <ws:Security> <ws:UsernameToken> <ws:Username>aarons</ws:Username> <ws:Password>snoraa</ws:Password> </ws:UsernameToken> </wsse:Security> ••• </S:Header> ••• </S:Envelope> Any help much appreciated Thanks, Mark

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• Buttons OnClick Event not firing when it causes a textboxes onChange event to fire first

  - by user48408

  I have a few textboxes and button to save their values on a webpage. The onchange event of the textboxes fires some js which adds the changed text to a js array. The ok button when clicked flushes this to the database via a webservice. This works fine except when the onchange event is caused by clicking the ok button. In this scenario the onchange of the textboxes still fires but the onClick event of the button does not. Any ideas? textboxes look something like <input name="ctrlJPView$tbcTabContainer$Details$JP_Details_Address2Text" type="text" value="test" id="ctrlJPView_tbcTabContainer_Details_JP_Details_Address2Text" onchange="addSaveDetails('Jobs###' + document.getElementById('ctrlJPView_tbcTabContainer_Details_JP_Details_Address2Text').value + ');" style="font-size:8pt;Left:110px;Top:29px;Width:420px;Height:13px;Position:absolute;" /> My save button <input type="button" name="ctrlJPView$btnOk" value="OK" onclick="saveAmendments();refreshJobGrids();return false;__doPostBack('ctrlJPView$btnOk','')" id="ctrlJPView_btnOk" class="ControlText" style="width:60px;" /> UPDATE: I guess this comes down to one of two things. 1) Something is happening before the onClick of the button gets called to surpress that call such as an inadvertent return false; or 2) the onClick event isn't firing at all. Now I've rem'd out everything actually inside the functions that are being called beforehand but the problem persists. But if i remove the call altogether it works (???)

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• Displaying thumbnails of images (present at different locations in the sdcard) in a listview

  - by frieza

  Hi all, I have several images present in different folders in my sdcard. I would like to display a list of thumbnails. So what I have done is while rendering any row in the list I read the file in an input stream, get the byte array, decode it to obtain a bitmap and set it in an imageview. So far so good. But when I scroll the list, the list scrolls in jerks. I believe this is because decoding a bitmap from byte array takes some time. What I would like to know is that, is there any optimization which I can do to improve the performance, or better still is there any better method to achieve what I want ?

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• How to test if raising an event results in a method being called conditional on value of parameters

  - by MattC

  I'm trying to write a unit test that will raise an event on a mock object which my test class is bound to. What I'm keen to test though is that when my test class gets it's eventhandler called it should only call a method on certain values of the eventhandlers parameters. My test seems to pass even if I comment the code that calls ProcessPriceUpdate(price); I'm in VS2005 so no lambdas please :( So... public delegate void PriceUpdateEventHandler(decimal price); public interface IPriceInterface{ event PriceUpdateEventHandler PriceUpdate; } public class TestClass { IPriceInterface priceInterface = null; TestClass(IPriceInterface priceInterface) { this.priceInterface = priceInterface; } public void Init() { priceInterface.PriceUpdate += OnPriceUpdate; } public void OnPriceUpdate(decimal price) { if(price > 0) ProcessPriceUpdate(price); } public void ProcessPriceUpdate(decimal price) { //do something with price } } And my test so far :s public void PriceUpdateEvent() { MockRepository mock = new MockRepository(); IPriceInterface pi = mock.DynamicMock<IPriceInterface>(); TestClass test = new TestClass(pi); decimal prc = 1M; IEventRaiser raiser; using (mock.Record()) { pi.PriceUpdate += null; raiser = LastCall.IgnoreArguments().GetEventRaiser(); Expect.Call(delegate { test.ProcessPriceUpdate(prc); }).Repeat.Once(); } using (mock.Playback()) { test.Init(); raiser.Raise(prc); } }

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• C# 4.0: casting dynamic to static

  - by Kevin Won

  This is an offshoot question that's related to another I asked here. I'm splitting it off because it's really a sub-question: I'm having difficulties casting an object of type dynamic to another (known) static type. I have an ironPython script that is doing this: import clr clr.AddReference("System") from System import * def GetBclUri(): return Uri("http://google.com") note that it's simply newing up a BCL System.Uri type and returning it. So I know the static type of the returned object. now over in C# land, I'm newing up the script hosting stuff and calling this getter to return the Uri object: dynamic uri = scriptEngine.GetBclUri(); System.Uri u = uri as System.Uri; // casts the dynamic to static fine Works no problem. I now can use the strongly typed Uri object as if it was originally instantiated statically. however.... Now I want to define my own C# class that will be newed up in dynamic-land just like I did with the Uri. My simple C# class: namespace Entity { public class TestPy // stupid simple test class of my own { public string DoSomething(string something) { return something; } } } Now in Python, new up an object of this type and return it: sys.path.append(r'C:..path here...') clr.AddReferenceToFile("entity.dll") import Entity.TestPy def GetTest(): return Entity.TestPy(); // the C# class then in C# call the getter: dynamic test = scriptEngine.GetTest(); Entity.TestPy t = test as Entity.TestPy; // t==null!!! here, the cast does not work. Note that the 'test' object (dynamic) is valid--I can call the DoSomething()--it just won't cast to the known static type string s = test.DoSomething("asdf"); // dynamic object works fine so I'm perplexed. the BCL type System.Uri will cast from a dynamic type to the correct static one, but my own type won't. There's obviously something I'm not getting about this...

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• Rails fields_for parameters for a has_many relation don't yield an Array in params

  - by user1289061

  I have a model Sensor with has_many and accepts_nested_attributes_for relationships to another model Watch. In a form to update a Sensor, I have something like the following <%= sensor_form.fields_for :watches do |watches_form| %> <%= watches_form.label :label %><br /> <%= watches_form.text_field :label %> <% end %> This is indended to allow editting of the already-created Watches belonging to a Sensor. This call spits form inputs as so: <input name="sensor[watches_attributes][0][label]" ... /> <input name="sensor[watches_attributes][0][id]" ... /> When this gets submitted, the params object in the Sensor controller gets an assoc like "sensor" => { "id"=>"1", "watches_attributes"=> { "0"=>{"id" => "1", "label" => "foo"}, "1"=>{"id" => "2", "label" => "bar"} } } For a has_many, accepts_nested_attributes_for update to work upon the @sensor.update_attributes call, it seems that that attributes key really must map to an Array. From what I've seen in the examples, the combination of has_many, accepts_nested_attributes_for, and sensor_form.fields_for should allow me to pass the resulting params object directly to @sensor.update_attributes and update each related object as intended. Instead the Sensor takes place, with no errors, but the Watch objects are not updated (since "watches_attributes" maps to a Hash instead of an Array?) Have I missed something?

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• What is the best way to automatically transpose a LilyPond source file into multiple keys?

  - by Michael Steele

  problem I'm using LilyPond to typeset sheet music for a church choir to perform. Depending on who is available on any given week, songs will be played in various keys. We have an amazing pianist who can play anything we throw at her and the guitarists will typically pencil in alternate chords, but I want to make things easier by having beautifully typeset sheet music available in any key we want. So say we're going to sing our ABCs. First I'll take whatever source transcriptions available and enter it into a LilyPond script: melody = \relative c' { c c g g a a g2 f f e e d d c2 } I want the ability to transpose this automatically, so if I want the whole thing in 'G' I wrap the song in a \transpose call like so: melody = \transpose c g \relative c' { c c g g a a g2 f f e e d d c2 } What I really want is to substitute something for the 'g' and generate the output for melody multiple times. Simple LilyPond variables don't seem to work here, and so far I've been unsuccessful in defining a scheme function to do this. What I've resorted to for the moment is taking the above file, call it twinkle.ly and turning it into an M4 script called twinkle.ly.m4, the contents of which look like this: melody = \transpose c _key \relative c' { c c g g a a g2 f f e e d d c2 } I then compile the while thing by executing the following line: > m4 -D _key=g twinkle.ly.m4 > twinkle_g.ly && lilypond twinkle_g.ly I've written a Makefile to do this for me, defining rules for every song I have and every key I'm interested in. question There's got to be a better way of going about this. Given that Lilypond supports embedded scheme, I would prefer to not use a macro preprocessed on it. Has anybody else come up with a solution to this same problem?

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• Getting Argument Names In Ruby Reflection

  - by Joe Soul-bringer

  I would like to do some fairly heavy-duty reflection in the Ruby programming language. I would like to create a function which would return the names of the arguments of various calling functions higher up the call stack (just one higher would be enough but why stop there?). I could use Kernel.caller go to the file and parse the argument list but that would be ugly and unreliable. The function that I would like would work in the following way: module A def method1( tuti, fruity) foo end def method2(bim, bam, boom) foo end def foo print caller_args[1].join(",") #the "1" mean one step up the call stack end end A.method1 #prints "tuti,fruity" A.method2 #prints "bim, bam, boom" I would not mind using ParseTree or some similar tool for this task but looking at Parsetree, it is not obvious how to use it for this purpose. Creating a C extension like this is another possibility but it would be nice if someone had already done it for me. Edit2: I can see that I'll probably need some kind of C extension. I suppose that means my question is what combination of C extension would work most easily. I don't think caller+ParseTree would be enough by themselves. As far as why I would like to do this goes, rather than saying "automatic debugging", perhaps I should say that I would like to use this functionality to do automatic checking of the calling and return conditions of functions. Say def add x, y check_positive return x + y end Where check_positive would throw an exception if x and y weren't positive (obviously, there would be more to it than that but hopefully this gives enough motivation)

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• How do you clear a CustomValidator Error on a Button click event?

  - by George

  I have a composite User control for entering dates: The CustomValidator will include server sided validation code. I would like the error message to be cleared via client sided script if the user alters teh date value in any way. To do this, I included the following code to hook up the two drop downs and the year text box to the validation control: <script type="text/javascript"> ValidatorHookupControlID("<%= ddlMonth.ClientID%>", document.getElementById("<%= CustomValidator1.ClientID%>")); ValidatorHookupControlID("<%= ddlDate.ClientID%>", document.getElementById("<%= CustomValidator1.ClientID%>")); ValidatorHookupControlID("<%= txtYear.ClientID%>", document.getElementById("<%= CustomValidator1.ClientID%>")); </script> However, I would also like the Validation error to be cleared when the user clicks the clear button. When the user clicks the Clear button, the other 3 controls are reset. To avoid a Post back, the Clear button is a regular HTML button with an OnClick event that resets the 3 controls. Unfortunately, the ValidatorHookupControlID method does not seem to work on HTML controls, so I thought to change the HTML Button to an ASP button and to Hookup to that control instead. However, I cannot seem to eliminate the Postback functionality associated by default with the ASP button control. I tried to set the UseSubmitBehavior to False, but it still submits. I tried to return false in my btnClear_OnClick client code, but the code sent to the browser included a DoPostback call after my call. btnClear.Attributes.Add("onClick", "btnClear_OnClick();") Instead of adding OnClick code, I tried overwriting it, but the DoPostBack code was still included in the final code that was sent to the browser. What do I have to do to get the Clear button to clear the CustomValidator error when clicked and avoid a postback? btnClear.Attributes.Item("onClick") = "btnClear_OnClick();"

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• retrieve events where uid is the creator and application id is the admin - Facebook API

  - by Anup Parekh

  I would like to know if there is a Facebook API call to retrieve the events (eids) for all the events a user has created using my facebook connect application. The events are created using the following REST api call: https://api.facebook.com/method/events.create?event_info=' . $e_i . '&access_token=' . $cookie['access_token'] $e_i is the event info array where the 'host' value is set to 'Me' as follows $event_info['host'] = 'Me'; On Facebook events under the "Created by:" section it lists "My user name,Application Name", I presume this is because I am the creator and the application is the admin as stated in the REST api documentation http://developers.facebook.com/docs/reference/rest/events.create/ Unfortunately I cannot seem to find out how (neither REST nor GPRAPH API) to return a list of events where I am the creator and the application is the admin as in the above scenario. If this is possible I would really appreciate some assistance with how it is done. So far I have tried: REST API events.get using uid=application_id. This only returns events created by the application not those including the user who created them GRAPH API https://graph.facebook.com/me/events?fields=owner&access_token=... this returns all the events for 'me' but not where the application is also the admin. It seems strange that there's no reference to the linkage between the event creator and the event admin through the API but in Facebook it is able to pull both and display them on the event details.

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• How can i Execute a Controller's ActionMethod programatically?

  - by Pure.Krome

  Hi folks, I'm trying to execute a controller's Action Method programatically and I'm not sure how. Scenario: When my ControllerFactory fails to find the controller, I wish it to manually execute a single action method which i have on a simple, custom controller. I don't want to rely on using any route data to determine the controller/method .. because that route might not have been wired up. Eg. // NOTE: Error handling removed from this example. public class MyControllerFactory : DefaultControllerFactory { protected override IController GetControllerInstance(Type controllerType) { IController result = null; // Try and load the controller, based on the controllerType argument. // ... snip // Did we retrieve a controller? if (controller == null) { result = new MyCustomController(); ((MyCustomController)result).Execute404NotFound(); // <-- HERE! } return result; } } .. and that method is .. public static void Execute404NotFound(this Controller controller) { result = new 404NotFound(); // Setup any ViewData.Model stuff. result.ExecuteResult(controller.ControllerContext); // <-- RUNTIME // ERROR's HERE } Now, when I run the controller factory fails to find a controller, i then manually create my own basic controller. I then call the extension method 'Execute404NotFound' on this controller instance. That's fine .. until it runs the ExecuteResult(..) method. Why? the controller has no ControllerContext data. As such, the ExecuteResult crashes because it requires some ControllerContext. So - can someone out there help me? see what I'm doing wrong. Remember - i'm trying to get my controller factory to manually / programmatically call a method on a controller which of course would return an ActionResult. Please help!

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• 406 Not Acceptable error when using Jquery $.post in Firefox but not in Safari or Chrome

  - by jlfenaux

  I'm using Jquery (1.3.2) $.post command to trigger an ajax call to a rails server. The code works great on Safari and on Google Chrome (mac), but when I tried it on Firefox (3.5.7), I got a weird '406 Not Acceptable' error. When I look at the headers, it Firefox indicated that it accepted only ' text/javascript' responses. And the response Content-Type was 'text/html; charset=utf-8'. In Chrome the accepted types were 'application/json, text/javascript, /, text/javascript' and the response Content-Type was 'application/json; charset=utf-8'. I tried to force the content type in rails to 'text/javascript' format.json do render :json => @races.to_json, :content_type => 'text/javascript' end The content type is indeed changed in Chrome, but not in Firefox where it remains 'text/html'. Here is the code I used to trigger the ajax call. $.post( "/locator", params, function(data){...}, "json" ); Is there something I can do to make this work in Firefox? Thanks

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