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• Best Practices for persisting iPod Playlist (MPMediaItemCollection) across sessions

  - by coneybeare

  When using in-app audio in the iPhone SDK, it is possible to allow users to select a list from their ipod library and create an in-app local playlist. If I want to persist this choice, it is easy to serialize the data and write to file, then recover. Just vanilla like this, however, leads me to think there is going to be something wrong. For example, what if the user syncs and removes sounds? I can loop across them all and query the iPod DB at setup time, but with lists that could be 50,000 long, this could take some time. How are other people doing this and what are some gotchas that I haven't though about?

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• Translate query to NHibernate

  - by Rob Walker

  I am trying to learn NHibernate, and am having difficulty translating a SQL query into one using the criteria API. The data model has tables: Part (Id, Name, ...), Order (Id, PartId, Qty), Shipment (Id, PartId, Qty) For all the parts I want to find the total quantity ordered and the total quantity shipped. In SQL I have: select shipment.part_id, sum(shipment.quantity), sum(order.quantity) from shipment cross join order on order.part_id = shipment.part_id group by shipment.part_id Alternatively: select id, (select sum(quantity) from shipment where part_id = part.id), (select sum(quantity) from order where part_id = part.id) from part But the latter query takes over twice as long to execute. Any suggestions on how to create these queries in (fluent) NHibernate? I have all the tables mapped and loading/saving/etc the entities works fine.

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• How to (pre)start xamlx workflow service

  - by rwwilden

  Related to this question. I have a xamlx workflow service that loads part of its definition from a database when it runs (using ActivityXamlServices.Load). Reason for this is that I need versioning, see the related question. I'll use WCF routing to direct calls to the right service. The part that I load dynamically contains a Receive activity. However, this activity is 'invisible' as long as the workflow doesn't start because the part of the workflow I load from the database is only loaded when the workflow starts. So from the outside it appears as if there is no Receive activity in the workflow. Apart from not being able to generate a contract for the workflow service, I can't call the service either. My first attempt was to do a soap call with the right contract on the workflow service. However, the runtime doesn't automagically activate my workflow in that case. So the question is, how do I start a workflow that is hosted inside IIS? Regards, Ronald

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• What exactly is the "Multi-threaded Debug DLL" Runtime Library option doing in VS 2008?

  - by GregH

  I have a solution in VS 2008 that creates a DLL. I then use that DLL in another application. If I go in to the DLL projects property pages and change the following configuration for a DEBUG build then the built dll no long provides the desired functionality. If I change it back and rebuild the DLL, then the DLL does provide the correct functionality: Property Pages = Configuration Properties = C/C++ = Code Generation = Runtime Library If set to "Multi-threaded Debug DLL (/MDd)" then everything works as it should. I get the correct functionality from the DLL If set to "Multi-threaded DLL (/MD)" then the DLL does not function properly...no runtime errors or anything, it just doesn't work (The DLL is supposed to plot some lines on a map but does not in this mode). So the question is, why does using the /MDd flag result in correction functionality of the underlying code, while /MD results in incorrect functionality? A little background...somebody else developed the DLL in C++ and I am using this DLL in a VB.net application.

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• Documenting applications - automation / semi-automation for screenshots?

  - by bguiz

  For me one of the biggest bores of being a developer is writing user documentation. (I am referring to the stuff that gets exported into PDF files files that ship with the product, not comments in code here). The task off adding or updating new bits of text to the existing documentation is OK. However having to take screenshots of select screens can be quite a tedious process. Is there a way to automate or even semi-automate the process of taking screenshots? The main requirement is the ability to crop images such that they contain only the window, including window manager areas (such as the title bar). The secondary requirement is that any format is OK, so long as it can be exported to PDF. EDIT: Any more biters?

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• iPhone CoreData join

  - by Ken

  Hi guys, long time reader, first time poster. (A link to this schema is located here) http://www.weeshsoft.com/pix/DatabasePic.jpg I'm trying to get all LanguageEntries from a database for a given category.categoryName and languageset.languageSetName e.g. NSFetchRequest* fetchRequest = [[NSFetchRequest alloc] init]; NSEntityDescription *entity = [NSEntityDescription entityForName:@"LanguageEntry" inManagedObjectContext:del.managedObjectContext]; [fetchRequest setEntity:entity]; NSString* predicateString = [NSString stringWithFormat:@"Category.categoryName = %@ AND LanguageSet.languageSetName = %@", @"Food", @"English####Spanish"]; fetchRequest.predicate = [NSPredicate predicateWithFormat:predicateString]; NSError *error = nil; NSArray* objects = [del.managedObjectContext executeFetchRequest:fetchRequest error:&error]; This always returns 0 objects. If I set the predicate string to match on one relationship (e.g. Category.categoryName = Food or languageSet.languageSetName = English####Spanish) it will return data. This is baffling, can anyone shed some light? -Ken

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• Difference between Thread.Sleep(0) and Thread.Yield()

  - by Xose Lluis

  As Java has had Sleep and Yield from long ago, I've found answers for that platform, but not for .Net .Net 4 includes the new Thread.Yield() static method. Previously the common way to hand over the CPU to other process was Thread.Sleep(0). Apart from Thread.Yield() returning a boolean, are there other performance, OS internals differences? For example, I'm not sure if Thread.Sleep(0) checks if other thread is ready to run before changing the current Thread to waiting state... if that's not the case, when no other threads are ready, Thread.Sleep(0) would seem rather worse that Thread.Yield().

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• Eager-loading association count with Arel (Rails 3)

  - by Matchu

  Simple task: given that an article has many comments, be able to display in a long list of articles how many comments each article has. I'm trying to work out how to preload this data with Arel. The "Complex Aggregations" section of the README file seems to discuss that type of situation, but it doesn't exactly offer sample code, nor does it offer a way to do it in two queries instead of one joined query, which is worse for performance. Given the following: class Article has_many :comments end class Comment belongs_to :article end How can I preload for an article set how many comments each has?

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• Rules engine for Silverlight?

  - by frances1983

  At the moment I'm developing a web based application using Silverlight 3.0. For the business rules I'm looking for a rules engine that's both easy to use for me and my users, which will work with SL3. Is something like that available out of the box or will I need to roll my own? I've Googled and looked around the various code sites (Codeplex, Code Project etc), but didn't see anything that suits my needs. I did also have a good long look at NxBRE, but it's Rules syntax is too complex for 'dummy' users.

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• TimeoutException in simultaneous calls to WCF services from Silverlight application

  - by Alexander K.

  Analysing log files I've noticed that ~1% of service calls ended with TimeoutException on the Silverlight client side. The services (wcf) are quite simple and do not perform long computations. According the log all calls to the services are always processed in less that 1 sec (even when TimeoutException is occurred on the client!), so it is not server timeout. So what is wrong? Can it be configuration or network problem? How can I avoid it? What additional logging information can be helpful for localizing this issue? The only one workaround I've thought up is to retry service calls after timeout. I will appreciate any help on this issue! Update: On startup the application performs 17 service calls and 12 of them simultaneously (may it be cause of failure?). Update: WCF log has not contained useful information about this issue. It seems some service calls do not reach the server side.

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• Antlr question: cannot get Antlr tool to compile simple file from ANTLRWorks

  - by Don Henton

  Here is the grammar file: grammar fred; test : 'fred'; Here is the batch file to launch the tool: SET JAVA_HOME=C:\Program Files\Java\jdk1.6.0_24 SET PATH=%PATH%;%JAVA_HOME%\bin SET ANTLR_HOME=c:/users/don/workspace/antlrAssign/lib/ java -cp %ANTLR_HOME%/antlr-3.3-complete.jar antlr.Tool fred.g Here's the result: ANTLR Parser Generator Version 2.7.7 (20060906) 1989-2005 fred.g:1:1: unexpected token: grammar error: Token stream error reading grammar(s): fred.g:3:19: expecting ''', found 'r' fred.g:1:1: rule grammar trapped: fred.g:1:1: unexpected token: grammar TokenStreamException: expecting ''', found 'r' Prior postings refer to "org.antlr.Tool" but the 3.3 jar has it located as above. The idea was to create a debug version of a tree parser, and according to the documentation, you have to use the command line tool. Has anyone seen this before? Am I nuts? It's two lines long and its dying on the first word in the file. Of course this compiles in antlrworks. Any help appreciated, I can't afford any more adjustments to my medications.

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• Multiple update panels and multiple postbacks cause entire page to refresh...

  - by Matt

  I'm having the same problem I had yesterday... The solution Aristos provided helped solve the problem, but I have other places sending updatepanel postbacks causing the same problem. When an update panel is updated and another request for an update is called before it has a chance to render the first updates, the entire page refreshes instead of just the update panel. I used fiddler to see what was going on and here's what happens... If I wait for the request to return before doing another request I get this: 21443|updatePanel|dnn_ctr1107_CRM_SalesTool_LeadsUpdatePanel| But if I don't wait, I get this: 66|pageRedirect||http://mysite.com/salesdashboard.aspx| The code from the previous question is still the same except I added UpdateMode="Conditional" to the update panel. Any ideas? Or is the only solution to this making sure that 2+ updates for any number of update panels (as long as they're on the same page) never happen? Thanks, Matt

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• Was Joel right about XML being slow?

  - by Will

  A long time ago Joel explained how various every-day coding things were slow, and this led to XML as a data store being slow: http://www.joelonsoftware.com/articles/fog0000000319.html Are those every-day coding things - strcat and malloc - still slow in a std::string and dlmalloc world? What else has changed in modern processors and mainstream frameworks? And is XML still slow? You can't find an RDBMS that doesn't claim some kind of native XML support these days; haven't they got it faster - a single pass to index it for example - yet?

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• Problem with the nonresponding threads

  - by Oxygen

  Hello there, I have a web application which runs multiple threads on button click each thread making IO call on different ipAddresses ie(login windows account and then making file operations). There is a treshold value of 30 seconds. I assume that while login attempt if the treshold is exceeded, device on ipAddress does not match my conditions thus I dont care it. Thread.Abort() does not fit my situation where it waits for the IO call to finish which might take long time. I tried doing the db operations acording to states of the threads right after the treshold timeout. It worked fine but when I checked out the log file, I noticed that the thread.IsAlive property of the nonresponding threads were still true. After several debuggings on my local pc, I encountered a possible deadlock situation (which i suspect) that my pc crashed badly. In short, do you have any idea about killing (forcefully) nonresponding threads (waiting for the IO opreation) right after the execution of the button_click? (PS: I am not using the threadpool) Oguzhan

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• Finding the Geo-location on a Blackberry?

  - by Frederico

  I'm running into an issue when trying to geolocate users whom are using blackberry devices. Currently there are a few checks that I go through to geolocate the individual the first, using the navigator paramater inside browsers. if(navigator.geolocation) if this fails then I have a backup using a free service (for testing) from maxmind: See Here Yet this doesn't return back the city at all either. I've then tried using the JSPI that google maps proviedes, and echoing out the google.loader.ClientLocation: if (google.loader.ClientLocation != null) { document.write("Your Location Is: " + google.loader.ClientLocation.address.city + ", " + google.loader.ClientLocation.address.region + " lat: " + google.loader.ClientLocation.latitude + " Long: " + google.loader.ClientLocation.longitude); } else { document.write("Your Location Was Not Detected By Google Loader"); } When this didn't work I tried following the google maps 3.0 detect location seen here: Detecting Location I've done all this after seeing this work correctly in google latitude.. so I know there has to be a way to get the location... any thoughts, ideas on what I could possibly try? Thank you kindly

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• Which Devices Support Javascript Geolocation via navigator.geolocation ?

  - by Maciek

  The iPhone supports geolocation in mobile Safari via the following call: navigator.geolocation.getCurrentPosition( function(pos){ var lat = pos.coords.latitude; var long = pos.coords.longitude; }, function(){ /* Handler if location could not be found */ } ); I'd like to build a good list of devices that have one of the following: support this feature out of the box, or support this feature with an upgrade, or support geolocation with equivalent fidelity of data with some other snippet of Javascript. I'm only familiar with my own device, so this is my list so far: Out of the box: iPhone 3GS Supported, but only with an update iPhone 3G iPhone 2G (?) PC or Mac computer with Firefox 3.5 Supported with some other snippet ? What is the level of support in Blackberry, Android phones, etc?

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• Empty "Groups" in People Picker Navigation Controller

  - by Meltemi

  I'm using the standard People Picker Navigation Controller to let users associate one of their contacts with one of my objects. It presents itself as a long list of ALL contacts. The back button (top left) says "Groups" but when clicked on it shows an empty screen...even when there are many Groups in the user's address book. I've read through the docs and can't seem to find how to populate the Groups area. Here's how I present the people picker. Fairly standard: - (IBAction)showPicker:(id)sender { ABPeoplePickerNavigationController *picker = [[ABPeoplePickerNavigationController alloc] init]; picker.peoplePickerDelegate = self; [self presentModalViewController:picker animated:YES]; [picker release]; } What am I missing?

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• UILabel text doesn't word wrap

  - by iFloh

  Hi, I have a long text string (including \n newline charactersthat I feed into a UILabel for display. The UILabel is dynamically setup to provide sufficient space foor the text. My code looks like this: myText = [NSString stringWithFormat:@"%@some text: %@ \n \n %@", myText, moreText1, moreText2]; NSLog(@"%@", myText); myLabelSize = [vLabelText sizeWithFont:[UIFont fontWithName:@"Helvetica" size:(15.0)] constrainedToSize:cMaxLabelSize lineBreakMode:UILineBreakModeWordWrap]; UILabel *lBody = [[UILabel alloc] initWithFrame:CGRectMake(cFromLeft, vFromTop, vLabelSize.width, vLabelSize.height)]; lBody.font = [UIFont fontWithName:@"Helvetica" size:(15.0)]; lBody.lineBreakMode = UILineBreakModeWordWrap; lBody.textAlignment = UITextAlignmentLeft; lBody.backgroundColor = [UIColor cyanColor]; [myScrollView addSubview:lBody]; lBody.text = vLabelText; My problem is that the text does not wrap, but truncates after the first line. The \n newlines are ignored. any ideas?

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• Passing touch events on to subviews

  - by Egil Jansson

  I have a view within a UIScrollView that loads an additional subview when the user presses a certain area. When this additional subview is visible, I want all touch events to be handled by this - and not by the scrollview. It seems like the first couple events are being handled by the subview, but then touchesCancelled is called and the scrollview takes over the touch detection. How can I make sure that the subview gets all the events as long as the movement activity is being performed on this view? This is my implementation on touchesMoved - which I thought would do the job... -(void) touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event { UITouch *touch = [[touches allObjects] objectAtIndex:0]; CGPoint touchPt = [touch locationInView:self]; UIView *hitView = [self hitTest:touchPt withEvent:event]; UIView *mySubView = subviewCtrl.view; if(hitView == mySubView) { [subviewCtrl.view touchesMoved:touches withEvent:event]; } else { NSLog(@"Outside of view..."); } }

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• Some unit tests fail in automated Team Build task

  - by weenet

  I have an odd situation. I have a suite of unit tests that pass on my dev machine. They pass on the build machine if run from visual studio. But 5 of them reliably fail during the automated build. There is nothing noteworthy about the ones that fail that I can see (and I've stared at them a long time). Anyone seen anything like this? Is there a way to see the test output in the Team Build log? All I get is Passed or Failed messages, but not the Assert message. Thanks!

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• Log response-time in restlet-based webservice

  - by amarillion

  What is the simplest way to log the response-time for a restlet-based webservice? I want to make sure that our webservice has a reasonable response time. So I want to be able to keep an eye on response times, and do something about the requests that take too long. The closest thing I could find is this recipe: http://www.naviquan.com/blog/restlet-cookbook-log, it explains how to change the log format. But there doesn't seem to be a parameter for response times, so probably a completely different approach is needed.

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• What is the best way to remove accents in a python unicode string?

  - by MiniQuark

  I have a unicode string in python, and I would like to remove all the accents (diacritics). I found on the Web an elegant way to do this in Java: convert the unicode string to its long normalized form (with a separate character for letters and diacritics) remove all the characters whose unicode type is "diacritic". Do I need to install a library such as pyICU or is this possible with just the python standard library? And what about in python 3.0? Important note: I would like to avoid code with an explicit mapping from accented characters to their non-accented counterpart. Thanks for your help.

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• Does Sandcastle support Entity Framework Partial Classes?

  - by ChrisHDog

  I am attempting to use Sandcastle (and Sandcastle Help File Builder) to do some "auto-documentation" of some classes I am using. The classes that are giving me trouble are some partial classes on Entity Framework items that add methods and properties to those Framework items. The triple slash comments don't appear to come through on the methods and properties created in the partial classes. I have out how to get xml documentation of the base properties using the short summary and long description fields on the .emdx editor, but that doesn't provide a solution for the items in the partial classes. Is this possible? Is it perhaps just settings that I'm not setting correctly to pick up the partial classes? Does Sandcastle do partial classes in non-Entity Framework settings? Is what I'm doing even possible (has anyone else successfully used the xml created from triple slash comments to create documentation on entity framework partial classes, and if so how did you do that)? Any assistance is appreciated

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• MKMapView doesn't want to call didAddAnnotationViews method

  - by TheLearner

  I am writing a little map kit app but it doesn't want to call the delegate method didaddannotationviews: (void)mapView:(MKMapView *)mv didAddAnnotationViews:(NSArray *)views { //Get the first MKAnnotationView from the views returned MKAnnotationView *annotationView = [views objectAtIndex:0]; //Get the annotation from the first annotation view and save it in a variable which can hold any object as long as it implements mkannotation id <MKAnnotation> mp = [annotationView annotation]; //Create a region MKCoordinateRegion region = MKCoordinateRegionMakeWithDistance([mp coordinate], 250, 250); //As the mapview to animate i.e. display the region [mv setRegion:region animated:YES]; } @interface WhereAmIAppDelegate : NSObject { UIWindow *window; CLLocationManager *locationManager; IBOutlet MKMapView *mapView; IBOutlet UIActivityIndicatorView *activityIndicator; IBOutlet UITextField *locationTitleField; }

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• Brute force characters into a textbox in c#

  - by Fred Dunly

  Hey everyone, I am VERY new to programming and the only language I know is C# So I will have to stick with that... I want to make a program that "test passwords" to see how long they would take to break with a basic brute force attack. So what I did was make 2 text boxes. (textbox1 and textbox2) and wrote the program so if the text boxes had the input, a "correct password" label would appear, but i want to write the program so that textbox2 will run a brute force algorithm in it, and when it comes across the correct password, it will stop. I REALLY need help, and if you could just post my attached code with the correct additives in it that would be great. The program so far is extremely simple, but I am very new to this, so. Thanks in advance. private void textBox2_TextChanged(object sender, EventArgs e) { } private void button1_Click(object sender, EventArgs e) { if (textBox2.Text == textBox1.Text) { label1.Text = "Password Correct"; } else { label1.Text = "Password Wrong"; } } private void label1_Click(object sender, EventArgs e) { } } } `

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