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  • Very strange Application.ThreadException behaviour.

    - by Brann
    I'm using the Application.ThreadException event to handle and log unexpected exceptions in my winforms application. Now, somewhere in my application, I've got the following code (or rather something equivalent, but this dummy code is enough to reproduce my issue) : try { throw new NullReferenceException("test"); } catch (Exception ex) { throw new Exception("test2", ex); } I'm clearly expecting my Application_ThreadException handler to be passed the "test2" exception, but this is not always the case. Typically, if another thread marshals my code to the UI, my handler receives the "test" exception, exactly as if I hadn't caught "test" at all. Here is a short sample reproducing this behavior. I have omitted the designer's code. static class Program { [STAThread] static void Main() { Application.ThreadException += new System.Threading.ThreadExceptionEventHandler(Application_ThreadException); Application.EnableVisualStyles(); Application.SetCompatibleTextRenderingDefault(false); Application.Run(new Form1()); } static void Application_ThreadException(object sender, System.Threading.ThreadExceptionEventArgs e) { Console.WriteLine(e.Exception.Message); } } public partial class Form1 : Form { public Form1() { InitializeComponent(); button1.Click+=new EventHandler(button1_Click); System.Threading.Thread t = new System.Threading.Thread(new System.Threading.ThreadStart(ThrowEx)); t.Start(); } private void button1_Click(object sender, EventArgs e) { try { throw new NullReferenceException("test"); } catch (Exception ex) { throw new Exception("test2", ex); } } void ThrowEx() { this.BeginInvoke(new EventHandler(button1_Click)); } } The output of this program on my computer is : test ... here I click button1 test2 I've reproduced this on .net 2.0,3.5 and 4.0. Does someone have a logical explanation ?

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  • c++ Design pattern for CoW, inherited classes, and variable shared data?

    - by krunk
    I've designed a copy-on-write base class. The class holds the default set of data needed by all children in a shared data model/CoW model. The derived classes also have data that only pertains to them, but should be CoW between other instances of that derived class. I'm looking for a clean way to implement this. If I had a base class FooInterface with shared data FooDataPrivate and a derived object FooDerived. I could create a FooDerivedDataPrivate. The underlying data structure would not effect the exposed getters/setters API, so it's not about how a user interfaces with the objects. I'm just wondering if this is a typical MO for such cases or if there's a better/cleaner way? What peeks my interest, is I see the potential of inheritance between the the private data classes. E.g. FooDerivedDataPrivate : public FooDataPrivate, but I'm not seeing a way to take advantage of that polymorphism in my derived classes. class FooDataPrivate { public: Ref ref; // atomic reference counting object int a; int b; int c; }; class FooInterface { public: // constructors and such // .... // methods are implemented to be copy on write. void setA(int val); void setB(int val); void setC(int val); // copy constructors, destructors, etc. all CoW friendly private: FooDataPrivate *data; }; class FooDerived : public FooInterface { public: FooDerived() : FooInterface() {} private: // need more shared data for FooDerived // this is the ???, how is this best done cleanly? };

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  • Get 1 array from 2 arrays (using RestKit 0.20)

    - by Reez
    I'm using RestKit and was wondering how to combine two array's into one array. I already have the data being pulled in separately from API1 and API2, but I don't know how to combine them into 1 tableView. Each API is pulling in media, and I want the combined tableView to show the most recent media (like any standard timeline does these days). I will post any extra code or help as necessary, thanks so much! Below shows API1 + API2 being pulled in correctly, but not combined into the tableView. Only data from API1 shows in the tableView. ViewController.m @interface StackOverflowViewController () @property (strong, nonatomic) NSArray *hArray; @property (strong, nonatomic) NSArray *springs; @property (strong, nonatomic) RKObjectManager *eObjectManager; @property (strong, nonatomic) NSArray *iArray; @property (strong, nonatomic) NSArray *imagesArray; @property (strong, nonatomic) RKObjectManager *iObjectManager; // Wain @property (strong, nonatomic) NSMutableArray *tableDataList; // Laarme @property (nonatomic, strong) NSMutableArray *contentArray; @property (nonatomic, strong) NSDateFormatter *dateFormatter1; // Dan @property (nonatomic, strong) NSMutableArray *combinedModel; @end @implementation StackOverflowViewController @synthesize tableView = _tableView; @synthesize spring; @synthesize leaf; @synthesize theme; @synthesize hArray; @synthesize springs; @synthesize eObjectManager; @synthesize iArray; @synthesize imagesArray; @synthesize iObjectManager; // Wain @synthesize tableDataList; // Laarme @synthesize contentArray; @synthesize dateFormatter1; // Dan @synthesize combinedModel; - (void)viewDidLoad { [super viewDidLoad]; // Do any additional setup after loading the view. [self configureRestKit]; [self loadMediaDan]; [self sortCombinedModel]; } - (void)didReceiveMemoryWarning { [super didReceiveMemoryWarning]; // Dispose of any resources that can be recreated. } - (void)configureRestKit { // API1 // initialize AFNetworking HTTPClient NSURL *baseURLE = [NSURL URLWithString:@"https://api.e.com"]; AFHTTPClient *clientE = [[AFHTTPClient alloc] initWithBaseURL:baseURLE]; // initialize RestKit RKObjectManager *eManager = [[RKObjectManager alloc] initWithHTTPClient:clientE]; self.eObjectManager = eManager; // setup object mappings RKObjectMapping *feedMapping = [RKObjectMapping mappingForClass:[Feed class]]; [feedMapping addAttributeMappingsFromArray:@[@"headline", @"premium", @"published", @"description"]]; RKObjectMapping *linksMapping = [RKObjectMapping mappingForClass:[Links class]]; RKObjectMapping *webMapping = [RKObjectMapping mappingForClass:[Web class]]; [webMapping addAttributeMappingsFromArray:@[@"href"]]; RKObjectMapping *mobileMapping = [RKObjectMapping mappingForClass:[Mobile class]]; [mobileMapping addAttributeMappingsFromArray:@[@"href"]]; RKObjectMapping *imagesMapping = [RKObjectMapping mappingForClass:[Images class]]; [imagesMapping addAttributeMappingsFromArray:@[@"height", @"width", @"url"]]; [feedMapping addPropertyMapping:[RKRelationshipMapping relationshipMappingFromKeyPath:@"links" toKeyPath:@"links" withMapping:linksMapping]]; [feedMapping addPropertyMapping:[RKRelationshipMapping relationshipMappingFromKeyPath:@"images" toKeyPath:@"images" withMapping:imagesMapping]]; [linksMapping addPropertyMapping:[RKRelationshipMapping relationshipMappingFromKeyPath:@"web" toKeyPath:@"web" withMapping:webMapping]]; [linksMapping addPropertyMapping:[RKRelationshipMapping relationshipMappingFromKeyPath:@"mobile" toKeyPath:@"mobile" withMapping:mobileMapping]]; // register mappings with the provider using a response descriptor RKResponseDescriptor *responseDescriptor = [RKResponseDescriptor responseDescriptorWithMapping:feedMapping method:RKRequestMethodGET pathPattern:nil keyPath:@"feed" statusCodes:[NSIndexSet indexSetWithIndex:200]]; [self.eObjectManager addResponseDescriptor:responseDescriptor]; // API2 // initialize AFNetworking HTTPClient NSURL *baseURLI = [NSURL URLWithString:@"https://api.i.com"]; AFHTTPClient *clientI = [[AFHTTPClient alloc] initWithBaseURL:baseURLI]; // initialize RestKit RKObjectManager *iManager = [[RKObjectManager alloc] initWithHTTPClient:clientI]; self.iObjectManager = iManager; // setup object mappings RKObjectMapping *dataMapping = [RKObjectMapping mappingForClass:[Data class]]; [dataMapping addAttributeMappingsFromArray:@[@"link", @"created_time"]]; RKObjectMapping *imagesMapping = [RKObjectMapping mappingForClass:[ImagesI class]]; [IMapping addAttributeMappingsFromArray:@[@""]]; RKObjectMapping *standardResolutionMapping = [RKObjectMapping mappingForClass:[StandardResolution class]]; [standardResolutionMapping addAttributeMappingsFromArray:@[@"url", @"width", @"height"]]; RKObjectMapping *captionMapping = [RKObjectMapping mappingForClass:[Caption class]]; [captionMapping addAttributeMappingsFromArray:@[@"text", @"created_time"]]; RKObjectMapping *userMapping = [RKObjectMapping mappingForClass:[User class]]; [userMapping addAttributeMappingsFromArray:@[@"username"]]; [dataMapping addPropertyMapping:[RKRelationshipMapping relationshipMappingFromKeyPath:@"images" toKeyPath:@"images" withMapping:imagesMapping]]; [imagesMapping addPropertyMapping:[RKRelationshipMapping relationshipMappingFromKeyPath:@"standard_resolution" toKeyPath:@"standard_resolution" withMapping:standardResolutionMapping]]; [dataMapping addPropertyMapping:[RKRelationshipMapping relationshipMappingFromKeyPath:@"caption" toKeyPath:@"caption" withMapping:captionMapping]]; [dataMapping addPropertyMapping:[RKRelationshipMapping relationshipMappingFromKeyPath:@"user" toKeyPath:@"user" withMapping:userMapping]]; // register mappings with the provider using a response descriptor RKResponseDescriptor *responseDescriptor2 = [RKResponseDescriptor responseDescriptorWithMapping:dataMapping method:RKRequestMethodGET pathPattern:nil keyPath:@"data" statusCodes:[NSIndexSet indexSetWithIndex:200]]; [self.iObjectManager addResponseDescriptor:responseDescriptor2]; } - (void)loadMedia { // Laarme contentArray = [[NSMutableArray alloc] init]; [self sortByDates]; // API1 NSString *apikey = @kCLIENTKEY; NSDictionary *queryParams = @{@"apikey" : apikey,}; [self.eObjectManager getObjectsAtPath:[NSString stringWithFormat:@"v1/n/?limit=4&leafs=%@&themes=%@", leafAbbreviation, themeID] // Changed limit to 4 for the time being parameters:queryParams success:^(RKObjectRequestOperation *operation, RKMappingResult *mappingResult) { hArray = mappingResult.array; [self.tableView reloadData]; } failure:^(RKObjectRequestOperation *operation, NSError *error) { NSLog(@"No?: %@", error); }]; // API2 [self.iObjectManager getObjectsAtPath:[NSString stringWithFormat:@"v1/u/2/m/recent/?client_id=e999"] parameters:nil success:^(RKObjectRequestOperation *operation, RKMappingResult *mappingResult) { iArray = mappingResult.array; [self.tableView reloadData]; } failure:^(RKObjectRequestOperation *operation, NSError *error) { NSLog(@"No: %@", error); }]; } // Laarme - (void)sortByDates { NSDateFormatter *dateFormatter2 = [[NSDateFormatter alloc] init]; //Do the dateFormatter settings, you may have to use 2 NSDateFormatters if the format is different for Data & Feed //The initialization of the dateFormatter is done before the block, because its alloc/init take some time, and you may have to declare it with "__block" //Since in your edit you do that and it seems it's the same format, just do @property (nonatomic, strong) NSDateFormatter dateFormatter; NSArray *sortedArray = [contentArray sortedArrayUsingComparator:^NSComparisonResult(id a, id b) { // Added Curly Braces around if else statements and used feedObject NSDate *aDate, *bDate; Feed *feedObject = (Feed *)a; Data *dataObject = (Data *)b; if ([a isKindOfClass:[Feed class]]) { //Feed *feedObject = (Feed *)a; aDate = [dateFormatter1 dateFromString:feedObject.published];} else { //if ([a isKindOfClass:[Data class]]) aDate = [dateFormatter2 dateFromString:dataObject.created_time];} if ([b isKindOfClass:[Feed class]]) { bDate = [dateFormatter1 dateFromString:feedObject.published];} else {//if ([b isKindOfClass:[Data class]]) bDate = [dateFormatter2 dateFromString:dataObject.created_time];} return [aDate compare:bDate]; }]; } #pragma mark - Table View - (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView { return 1; } - (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section { // API1 //return hArray.count; // API2 //return iArray.count; // API1 + API2 return hArray.count + iArray.count; } - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath { UITableViewCell *cell; if(indexPath.row < hArray.count) { // Date Change NSDateFormatter *df = [[NSDateFormatter alloc] init]; [df setDateFormat:@"MMMM d, yyyy h:mma"]; // API 1 TableViewCell *api1Cell = [tableView dequeueReusableCellWithIdentifier:@"YourAPI1Cell"]; // Do everything you need to do with the api1Cell // Use the index in 'indexPath.row' to get the object from you array // API1 Feed *feedLocal = [hArray objectAtIndex:indexPath.row]; // API1 NSString *dateString = [self timeSincePublished:feedLocal.published]; NSString *headlineText = [NSString stringWithFormat:@"%@", feedLocal.headline]; NSString *descriptionText = [NSString stringWithFormat:@"%@", feedLocal.description]; NSString *premiumText = [NSString stringWithFormat:@"%@", feedLocal.premium]; api1Cell.labelHeadline.text = [NSString stringWithFormat:@"%@", headlineText]; api1Cell.labelPublished.text = dateString; api1Cell.labelDescription.text = descriptionText; // SDWebImage API1 if ([feedLocal.images count] == 0) { // Not sure anything needed here } else { Images *imageLocal = [feedLocal.images objectAtIndex:0]; NSString *imageURL = [NSString stringWithFormat:@"%@", imageLocal.url]; NSString *imageWith = [NSString stringWithFormat:@"%@", imageLocal.width]; NSString *imageHeight = [NSString stringWithFormat:@"%@", imageLocal.height]; __weak UITableViewCell *wcell = cell; [cell.imageView setImageWithURL:[NSURL URLWithString:imageURL] placeholderImage:[UIImage imageNamed:@"X"] completed:^(UIImage *image, NSError *error, SDImageCacheType cacheType) { // Something }]; } cell = api1Cell; } else { // Date Change NSDateFormatter *df = [[NSDateFormatter alloc] init]; [df setDateFormat:@"MMMM d, yyyy h:mma"]; // API 2 MRWebListTableViewCellTwo *api2Cell = [tableView dequeueReusableCellWithIdentifier:@"YourAPI2Cell"]; // Do everything you need to do with the api2Cell // Remember to use 'indexPath.row - hArray.count' as the index for getting an object for your second array // API 2 Data *dataLocal = [iArray objectAtIndex:indexPath.row - hArray.count]; // API 2 NSString *dateStringI = [self timeSincePublished:dataLocal.created_time]; NSString *captionTextI = [NSString stringWithFormat:@"%@", dataLocal.caption.text]; NSString *usernameI = [NSString stringWithFormat:@"%@", dataLocal.user.username]; api2Cell.labelHeadline.text = usernameI; api2Cell.labelDescription.text = captionTextI; api2Cell.labelPublished.text = dateStringI; // SDWebImage API 2 if ([dataLocal.images count] == 0) { NSLog(@"Images Count: %lu", (unsigned long)dataLocal.images.count); // Not sure anything needed here } else { ImagesI *imageLocalI = [dataLocal.images objectAtIndex:0]; StandardResolutionI *standardResolutionLocal = [imageLocalI.standard_resolution objectAtIndex:0]; NSString *imageURLI = [NSString stringWithFormat:@"%@", standardResolutionLocal.url]; NSString *imageWithI = [NSString stringWithFormat:@"%@", standardResolutionLocal.width]; NSString *imageHeightI = [NSString stringWithFormat:@"%@", standardResolutionLocal.height]; // 11.2 __weak UITableViewCell *wcell = cell; [cell.imageView setImageWithURL:[NSURL URLWithString:imageURLI] placeholderImage:[UIImage imageNamed:@"X"] completed:^(UIImage *image, NSError *error, SDImageCacheType cacheType) { // Something }]; } cell = api2Cell; } return cell; } Feed.h @property (nonatomic, strong) Links *links; @property (nonatomic, strong) NSString *headline; @property (nonatomic, strong) NSString *source; @property (nonatomic, strong) NSDate *published; @property (nonatomic, strong) NSString *description; @property (nonatomic, strong) NSString *premium; @property (nonatomic, strong) NSArray *images; Data.h @property (nonatomic, strong) NSString *link; @property (nonatomic, strong) NSDate *created_time; @property (nonatomic, strong) UserI *user; @property (nonatomic, strong) NSArray *images; @property (nonatomic, strong) CaptionI *caption;

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  • ReaderWriterLockSlim and Pulse/Wait

    - by Jono
    Is there an equivalent of Monitor.Pulse and Monitor.Wait that I can use in conjunction with a ReaderWriterLockSlim? I have a class where I've encapsulated multi-threaded access to an underlying queue. To enqueue something, I acquire a lock that protects the underlying queue (and a couple of other objects) then add the item and Monitor.Pulse the locked object to signal that something was added to the queue. public void Enqueue(ITask task) { lock (mutex) { underlying.Enqueue(task); Monitor.Pulse(mutex); } } On the other end of the queue, I have a single background thread that continuously processes messages as they arrive on the queue. It uses Monitor.Wait when there are no items in the queue, to avoid unnecessary polling. (I consider this to be good design, but any flames (within reason) are welcome if they help me learn otherwise.) private void DequeueForProcessing(object state) { while (true) { ITask task; lock (mutex) { while (underlying.Count == 0) { Monitor.Wait(mutex); } task = underlying.Dequeue(); } Process(task); } } As more operations are added to this class (requiring read-only access to the lock protected underlying), someone suggested using ReaderWriterLockSlim. I've never used the class before, and assuming it can offer some performance benefit, I'm not against it, but only if I can keep the Pulse/Wait design.

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  • Dealing with multiple generics in a method call

    - by thaBadDawg
    I've been dealing a lot lately with abstract classes that use generics. This is all good and fine because I get a lot of utility out of these classes but now it's making for some rather ugly code down the line. For example: abstract class ClassBase<T> { T Property { get; set; } } class MyClass : ClassBase<string> { OtherClass PropertyDetail { get; set; } } This implementation isn't all that crazy, except when I want to reference the abstract class from a helper class and then I have to make a list of generics just to make reference to the implemented class, like this below. class Helper { void HelpMe<C, T>(object Value) where C : ClassBase<T>, new() { DoWork(); } } This is just a tame example, because I have some method calls where the list of where clauses end up being 5 or 6 lines long to handle all of the generic data. What I'd really like to do is class Helper { void HelpMe<C>(object Value) where C : ClassBase, new() { DoWork(); } } but it obviously won't compile. I want to reference ClassBase without having to pass it a whole array of generic classes to get the function to work, but I don't want to reference the higher level classes because there are a dozen of those. Am I the victim of my own cleverness or is there an avenue that I haven't considered yet?

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  • WPF ProgressBar - TargetParameterCountException

    - by Dr_Asik
    I am making my first WPF application, where I use the Youtube .NET API to upload a video to Youtube using the ResumableUploader. This ResumableUploader works asynchronously and provides an event AsyncOperationProgress to periodically report its progress percentage. I want a ProgressBar that will display this progress percentage. Here is some of the code I have for that: void BtnUpload_Click(object sender, RoutedEventArgs e) { // generate video uploader = new ResumableUploader(); uploader.AsyncOperationCompleted += OnDone; uploader.AsyncOperationProgress += OnProgress; uploader.InsertAsync(authenticator, newVideo.YouTubeEntry, new UserState()); } void OnProgress(object sender, AsyncOperationProgressEventArgs e) { Dispatcher.BeginInvoke((SendOrPostCallback)delegate { PgbUpload.Value = e.ProgressPercentage; }, DispatcherPriority.Background, null); } Where PgbUpload is my progress bar and the other identifiers are not important for the purpose of this question. When I run this, OnProgress will be hit a few times, and then I will get a TargetParameterCountException. I have tried several different syntax for invoking the method asynchronously, none of which worked. I am sure the problem is the delegate because if I comment it out, the code works fine (but the ProgressBar isn't updated of course). Thanks for any help.

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  • XNA Vector2 Rotation Question

    - by Tom Allen
    I'm messing about with some stuff in XNA and am trying to move an object around asteroids-style in that you press left and right to rotate and up/down to go forwards and backwards in the direction you are pointing. I've got the rotation of the sprite done, but i can't get the object to move in the direction you've pointed it, it always moves up and down on the x = 0 axis. I'm guessing this is straight forward but I just can't figure it out. My "ship" class has the following properties which are note worthy here: Vector2 Position float Rotation The "ship" class has an update method is where the input is handled and so far I've got the following: public void Update(GameTime gameTime) { KeyboardState keyboard = Keyboard.GetState(); GamePadState gamePad = GamePad.GetState(PlayerIndex.One); float x = Position.X; float y = Position.Y; if (keyboard.IsKeyDown(Keys.Left)) Rotation -= 0.1f; if (keyboard.IsKeyDown(Keys.Right)) Rotation += 0.1f; if (keyboard.IsKeyDown(Keys.Up)) y -= ??; if (keyboard.IsKeyDown(Keys.Down)) y += ??; this.Position = new Vector2(x, y); } Any help would be most appreciated!

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  • Is there a generic way of dealing with varying connection strings in C#?

    - by James Wiseman
    I have an application that needs to connect to a SQL database, and execute a SQL Agent Job. The connection string I am trying to access is stored in the registry, which is easily enough pulled out. This appliction is to be run on multiple computers, and I cannot guarantee the format of this connection string being consistent across these computers. Two that I have pulled out for example are: Data Source=Server1;Initial Catalog=DB1;Integrated Security=SSPI; Data Source=Server2;Initial Catalog=DB1;Provider=SQLNCLI.1;Integrated Security=SSPI;Auto Translate=False; I can use an object of type System.Data.SqlClient.SqlConnection to connect to the database with the first connection string, howevever, I get the following error when I pass the second to it: keyword not supported: 'provider' Similarly, I can use the an object of type System.Data.OleDb.OleDbConnection to connect to the database with the second connection string, howevever, I get the following error when I pass the first to it: An OLEDB Provider was not specified in the ConnectionString' I can solve this by scanning the string for 'Provider' and doing the connect conditionally, however I can't help but feel that there is a better way of doing this, and handle the connection strings in a more generic fashion. Does anyone have any suggestions?

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  • Serializing Configurations for a Dependency Injection / Inversion of Control

    - by Joshua Starner
    I've been researching Dependency Injection and Inversion of Control practices lately in an effort to improve the architecture of our application framework and I can't seem to find a good answer to this question. It's very likely that I have my terminology confused, mixed up, or that I'm just naive to the concept right now, so any links or clarification would be appreciated. Many examples of DI and IoC containers don't illustrate how the container will connect things together when you have a "library" of possible "plugins", or how to "serialize" a given configuration. (From what I've read about MEF, having multiple declarations of [Export] for the same type will not work if your object only requires 1 [Import]). Maybe that's a different pattern or I'm blinded by my current way of thinking. Here's some code for an example reference: public abstract class Engine { } public class FastEngine : Engine { } public class MediumEngine : Engine { } public class SlowEngine : Engine { } public class Car { public Car(Engine e) { engine = e; } private Engine engine; } This post talks about "Fine-grained context" where 2 instances of the same object need different implementations of the "Engine" class: http://stackoverflow.com/questions/2176833/ioc-resolve-vs-constructor-injection Is there a good framework that helps you configure or serialize a configuration to achieve something like this without hard coding it or hand-rolling the code to do this? public class Application { public void Go() { Car c1 = new Car(new FastEngine()); Car c2 = new Car(new SlowEngine()); } } Sample XML: <XML> <Cars> <Car name="c1" engine="FastEngine" /> <Car name="c2" engine="SlowEngine" /> </Cars> </XML>

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  • Creating a RESTful API - HELP!

    - by Martin Cox
    Hi Chaps Over the last few weeks I've been learning about iOS development, which has naturally led me into the world of APIs. Now, searching around on the Internet, I've come to the conclusion that using the REST architecture is very much recommended - due to it's supposed simplicity and ease of implementation. However, I'm really struggling with the implementation side of REST. I understand the concept; using HTTP methods as verbs to describe the action of a request and responding with suitable response codes, and so on. It's just, I don't understand how to code it. I don't get how I map a URI to an object. I understand that a GET request for domain.com/api/user/address?user_id=999 would return the address of user 999 - but I don't understand where or how that mapping from /user/address to some method that queries a database has taken place. Is this all coded in one php script? Would I just have a method that grabs the URI like so: $array = explode("/", ltrim(rtrim($_SERVER['REQUEST_URI'], "/"), "/")) And then cycle through that array, first I would have a request for a "user", so the PHP script would direct my request to the user object and then invoke the address method. Is that what actually happens? I've probably not explained my thought process very well there. The main thing I'm not getting is how that URI /user/address?id=999 somehow is broken down and executed - does it actually resolve to code? class user(id) { address() { //get user address } } I doubt I'm making sense now, so I'll call it a day trying to explain further. I hope someone out there can understand what I'm trying to say! Thanks Chaps, look forward to your responses. Martin p.s - I'm not a developer yet, I'm learning :)

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  • TypeError when using v 0.8.1 of FLOT library, but no error with v. 0.7

    - by DanielAttard
    I need some help to figure out why I am getting an error when trying to create a simple graph using the jQuery FLOT library. When I reference version 0.7 of the FLOT library, the page renders correctly: http://attardpropertytax.ca/flot07.html But when I switch to version 0.8.1 of the FLOT library, the page returns an error saying: Uncaught TypeError: Cannot read property 'left' of null http://attardpropertytax.ca/flot81.html The HTML is the same for both pages, so I cannot figure out why the new version 0.8.1 of FLOT returns an error, but the old version 0.7 does not. Any ideas? I somehow stumbled across a work-around that managed to fix my problem. I'm nut sure why, but I had to comment-out the following two sections of code from the v. 0.8.1 FLOT library: This was the first spot: // If the grid is visible, add its border width to the offset for (var a in plotOffset) { if(typeof(options.grid.borderWidth) == "object") { plotOffset[a] += showGrid ? options.grid.borderWidth[a] : 0; } else { plotOffset[a] += showGrid ? options.grid.borderWidth : 0; } } And this was the second spot: if (isNaN(v) || v < axis.min || v > axis.max // skip those lying on the axes if we got a border || (t == "full" && ((typeof bw == "object" && bw[axis.position] > 0) || bw > 0) && (v == axis.min || v == axis.max))) continue; I'm sure eventually @DNS will be taking a look at this question and maybe he will be able to help me understand what is going wrong with my code. Thanks.

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  • Gdata JavaScript Authsub continues redirect

    - by Krustal
    I am using the JavaScript Google Data API and having issues getting the AuthSub script to work correctly. This is my script currently: google.load('gdata', '1'); function getCookie(c_name){ if(document.cookie.length>0){ c_start=document.cookie.indexOf(c_name + "="); if(c_start!=-1){ c_start=c_start + c_name.length+1; c_end=document.cookie.indexOf(";",c_start); if(c_end==-1) c_end=document.cookie.length; return unescape(document.cookie.substring(c_start, c_end)); } } return ""; } function main(){ var scope = 'http://www.google.com/calendar/feeds/'; if(!google.accounts.user.checkLogin(scope)){ google.accounts.user.login(); } else { /* * Retrieve all calendars */ // Create the calendar service object var calendarService = new google.gdata.calendar.CalendarService('GoogleInc-jsguide-1.0'); // The default "allcalendars" feed is used to retrieve a list of all // calendars (primary, secondary and subscribed) of the logged-in user var feedUri = 'http://www.google.com/calendar/feeds/default/allcalendars/full'; // The callback method that will be called when getAllCalendarsFeed() returns feed data var callback = function(result) { // Obtain the array of CalendarEntry var entries = result.feed.entry; //for (var i = 0; i < entries.length; i++) { var calendarEntry = entries[0]; var calendarTitle = calendarEntry.getTitle().getText(); alert('Calendar title = ' + calendarTitle); //} } // Error handler to be invoked when getAllCalendarsFeed() produces an error var handleError = function(error) { alert(error); } // Submit the request using the calendar service object calendarService.getAllCalendarsFeed(feedUri, callback, handleError); } } google.setOnLoadCallback(main); However when I run this the page redirects me to the authentication page. After I authenticate it send me back to my page and then quickly sends me back to the authenticate page again. I've included alerts to check if the token is being set and it doesn't seem to be working. Has anyone has this problem?

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  • question about jQuery droppable/draggable.

    - by FALCONSEYE
    I modified a sample photo manager application. photo manager application Instead of photos, I have employee records coming from a query. My version will let managers mark employees as on vacation, or at work. One of the things I did is to include employee ids like <a href="123">. I get the ids from event.target. This works for the click function but not for the "droppable" function. This is what I have for the click function: $('ul.gallery > li').click(function(ev) { var $item = $(this); var $unid = ev.target; var $target = $(ev.target); if ($target.is('a.ui-icon-suitcase')) { deleteImage($item,$unid); } else if ($target.is('a.ui-icon-arrowreturnthick-1-w')) { recycleImage($item,$unid); } return false; }); ev.target correctly gives the employee id. when i try the same in one of the droppable functions: $gallery.droppable({ accept: '#suitcase li', activeClass: 'custom-state-active', drop: function(ev, ui) { var $unid = ev.target; alert($unid); recycleImage(ui.draggable,$unid); } }); the alert(ui) gives me [object]. What's in this object? How do i get the href out of this? thanks

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  • How to get at JSON in grails 2.0

    - by Mikey
    I am sending myself JSON like so with jQuery: $.ajax ({ type: "POST", url: 'http://localhost:8080/myproject/myController/myAction', dataType: 'json', async: false, //json object to sent to the authentication url data: {"stuff":"yes", "listThing":[1,2,3], "listObjects":[{"one":"thing"},{"two":"thing2"}]}, success: function () { alert("Thanks!"); } }) I send this to a controller and do println params And I know I'm already in trouble... [stuff:yes, listObjects[1][two]:thing2, listObjects[0][one]:thing, listThing[]:[1, 2, 3], action:myAction, controller:myController] I cannot figure out how to get at most of these values... I can get "yes" with params.stuff, but I cant do params.listThing.each{} or params.listObjects.each{} What am I doing wrong? UPDATE: I make the controller do this to try the two suggestions so far: println params println params.stuff println params.list('listObjects') println params.listThing def thisWontWork = JSON.parse(params.listThing) render("omg l2json") look how weird the parameters look at the end of the null pointer exception when I try the answers: [stuff:yes, listObjects[1][two]:thing2, listObjects[0][one]:thing, listThing[]:[1, 2, 3], action:l2json, controller:rateAPI] yes [] null | Error 2012-03-25 22:16:13,950 ["http-bio-8080"-exec-7] ERROR errors.GrailsExceptionResolver - NullPointerException occurred when processing request: [POST] /myproject/myController/myAction - parameters: stuff: yes listObjects[1][two]: thing2 listObjects[0][one]: thing listThing[]: 1 listThing[]: 2 listThing[]: 3 UPDATE 2 I am learning things, but this can't be right: println params['listThing[]'] println params['listObjects[0][one]'] prints [1, 2, 3] thing It seems like this is some part of grails new JSON marshaling. This is somewhat inconvenient for my purposes of hacking around with the values. How would I get all these individual params back into a big groovy object of nested maps and lists? Maybe I am not doing what I want with jQuery?

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  • Android: FragmentAdapter and pageview do not update the view

    - by user1240937
    My trouble is: when i get new data, my viewpager that use my custom adapter do not update view. I discovered that many programmer got same bug, so i tried a lot of suggestion but no way works for me. So tired. One more time, read my source and help me understand why i fail with updating view pleaseee! Here is my FragmentAdapter: private class SwipeyTabsPagerAdapter extends FragmentPagerAdapter implements SwipeyTabsAdapter { private final Context mContext; private String[] datas; public SwipeyTabsPagerAdapter(Context context, FragmentManager fm, String[] ds) { super(fm); this.mContext = context; datas=ds; } @Override public int getItemPosition(Object object) { return POSITION_NONE; } @Override public Fragment getItem(int position) { Log.e("new item:", datas[position]); return SwipeyTabFragment.newInstance(datas[position]); } @Override public int getCount() { return datas.length; } public TextView getTab(final int position, SwipeyTabs root) { TextView view = (TextView) LayoutInflater.from(mContext).inflate( R.layout.swipey_tab_indicator, root, false); view.setText(datas[position]); view.setOnClickListener(new OnClickListener() { public void onClick(View v) { mViewPager.setCurrentItem(position); } }); return view; } } and here is where i set adapter: SwipeyTabsPagerAdapter adapter = new SwipeyTabsPagerAdapter(getApplicationContext(), getSupportFragmentManager(),dicts); mViewPager.setAdapter(adapter); mTabs.setAdapter(adapter); mViewPager.getAdapter().notifyDataSetChanged(); By logcat, can see clearly that: only first time, newItem be processed, so view can not be update.

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  • Qt application crashing immediately without debugging info. How do I track down the problem?

    - by jjacksonRIAB
    I run an Qt app I've built: ./App Segmentation fault I run it with strace: strace ./App execve("./App", ["./App"], [/* 27 vars */]) = 0 --- SIGSEGV (Segmentation fault) @ 0 (0) --- +++ killed by SIGSEGV +++ Process 868 detached Again, no useful info. I run it with gdb: (gdb) run Starting program: /root/test/App Reading symbols from shared object read from target memory...(no debugging symbols found)...done. Loaded system supplied DSO at 0xffffe000 Program received signal SIGSEGV, Segmentation fault. 0x00000001 in ?? () Again, nothing. I run it with valgrind: ==948== Process terminating with default action of signal 11 (SIGSEGV) ==948== Bad permissions for mapped region at address 0x0 ==948== at 0x1: (within /root/test/App) Even if I put in debugging symbols, it doesn't give any more useful info. ldd shows all libraries being linked properly. Is there any other way I can find out what's wrong? I can't even do standard printf, cout, etc debugging. The executable doesn't even seem to start running at all. I rebuilt with symbols, and tried the suggestion below (gdb) break main Breakpoint 1 at 0x45470 (gdb) run Starting program: /root/test/App Breakpoint 1 at 0x80045470 Reading symbols from shared object read from target memory...done. Loaded system supplied DSO at 0xffffe000 Program received signal SIGSEGV, Segmentation fault. 0x00000001 in ?? () I checked for static initializers and I don't seem to have any. Yep, I tried printf, cout, etc. It doesn't even make it into the main routine, so I'm looking for problems with static initializers in link libraries, adding them in one-by-one. I'm not getting any stack traces either.

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  • How can a SVN::Error callback identify the context from which it was called

    - by Colin Fine
    I've written some fairly extensive Perl modules and scripts using the Perl bindings SVN::Client etc. Since the calls to SVN::Client are all deep in a module, I have overridden the default error handling. So far I have done so by setting $SVN::Error::handler = undef as described in [1], but this makes the individual calls a bit messy because you have to remember to make each call to SVN::Client in list context and test the first value for errors. I would like to switch to using an error handler I would write; but $SVN::Error::handler is global, so I can't see any way that my callback can determine where the error came from, and what object to set an error code in. I wondered if I could use a pool for this purpose: so far I have ignored pools as irrelevant to working in Perl, but if I call a SVN::Client method with a pool I have created, will any SVN::Error object be created in the same pool? Has anybody any knowledge or experience which bears on this? [1]: http://search.cpan.org/~mschwern/Alien-SVN-1.4.6.0/src/subversion/subversion/bindings/swig/perl/native/Core.pm#svn_error_t_-_SVN::Error SVN::Core POD

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  • Selenium: Can i test if a page loaded a flash app (ie a swf) properly?

    - by Max Williams
    hi all. I'm writing some selenium tests (in rspec for a rails app). One of my pages loads a swf and while i don't want to test the functionality of this flash app i do want to test that it loaded up ok. Is this possible? In case it helps, the html to load the swf is: <OBJECT classid="clsid:D27CDB6E-AE6D-11cf-96B8-444553540000" codebase="http://download.macromedia.com/pub/shockwave/cabs/flash/swflash.cab#version=8,0,0,0" width="800" height="600"> <PARAM NAME=movie VALUE="http://localhost:3000/assets/players/millionaire/millionaire.swf"> <PARAM NAME=quality VALUE="high"> <PARAM NAME=FlashVars VALUE="quizXML=http://localhost:3000/quizzes/371.xml?online=true&myURL=http://localhost:3000/assets/players/millionaire/&online=true"> <param name=width value="800"> <param name=height value="600"> <EMBED src="http://localhost:3000/assets/players/millionaire/millionaire.swf" FlashVars="quizXML=http://localhost:3000/quizzes/371.xml?online=true&myURL=http://localhost:3000/assets/players/millionaire/&online=true" width="800" height="600" quality=high TYPE="application/x-shockwave-flash" PLUGINSPAGE="http://www.macromedia.com/go/getflashplayer"> </EMBED> </OBJECT> thanks - max

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  • A generic error occurred in GDI+, JPEG Image to MemoryStream

    - by madcapnmckay
    Hi, This seems to be a bit of an infamous error all over the web. So much so that I have been unable to find an answer to my problem as my scenario doesn't fit. An exception gets thrown when I save the image to the stream. Weirdly this works perfectly with a png but gives the above error with jpg and gif which is rather confusing. Most similar problem out there relate to saving images to files without permissions. Ironically the solution is to use a memory stream as I am doing.... public static byte[] ConvertImageToByteArray(Image imageToConvert) { using (var ms = new MemoryStream()) { ImageFormat format; switch (imageToConvert.MimeType()) { case "image/png": format = ImageFormat.Png; break; case "image/gif": format = ImageFormat.Gif; break; default: format = ImageFormat.Jpeg; break; } imageToConvert.Save(ms, format); return ms.ToArray(); } } More detail to the exception. The reason this causes so many issues is the lack of explanation :( System.Runtime.InteropServices.ExternalException was unhandled by user code Message="A generic error occurred in GDI+." Source="System.Drawing" ErrorCode=-2147467259 StackTrace: at System.Drawing.Image.Save(Stream stream, ImageCodecInfo encoder, EncoderParameters encoderParams) at System.Drawing.Image.Save(Stream stream, ImageFormat format) at Caldoo.Infrastructure.PhotoEditor.ConvertImageToByteArray(Image imageToConvert) in C:\Users\Ian\SVN\Caldoo\Caldoo.Coordinator\PhotoEditor.cs:line 139 at Caldoo.Web.Controllers.PictureController.Croppable() in C:\Users\Ian\SVN\Caldoo\Caldoo.Web\Controllers\PictureController.cs:line 132 at lambda_method(ExecutionScope , ControllerBase , Object[] ) at System.Web.Mvc.ActionMethodDispatcher.Execute(ControllerBase controller, Object[] parameters) at System.Web.Mvc.ReflectedActionDescriptor.Execute(ControllerContext controllerContext, IDictionary`2 parameters) at System.Web.Mvc.ControllerActionInvoker.InvokeActionMethod(ControllerContext controllerContext, ActionDescriptor actionDescriptor, IDictionary`2 parameters) at System.Web.Mvc.ControllerActionInvoker.<>c__DisplayClassa.<InvokeActionMethodWithFilters>b__7() at System.Web.Mvc.ControllerActionInvoker.InvokeActionMethodFilter(IActionFilter filter, ActionExecutingContext preContext, Func`1 continuation) InnerException: OK things I have tried so far. Cloning the image and working on that. Retrieving the encoder for that MIME passing that with jpeg quality setting. Please can anyone help.

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  • Java - How to declare table[i][j] elements as instance variables?

    - by JDelage
    All, I am trying to code a Connect4 game. For this, I have created a P4Game class and a P4Board class which represents the i X j dimensions of the Connect4 board. In P4Game, I have the following: public class P4Game{ //INSTANCE VARIABLES private int nbLines; private int nbColumns; private P4Board [][] position; //CONSTRUCTOR public P4Game(int nbLines, int nbColumns){ this.nbColumns = nbColumns; this.nbLines = nbLines; P4Board [][] position = new P4Board [nbLines][nbColumns]; //Creates the table to receive the instances of the P4Board object.*/ for (int i=0; i<nbLines; i++){ for (int j=0; j<nbColumns; j++){ this.position[i][j] = new P4Board(i,j); //Meant to create each object at (line=i, column=j) } } } This causes a NullPointerException in the nested loops where I mention this.position[i][j]. I reference those objects in other methods of this class so I need them to be instance variables. I suppose the exception is due to the fact that I have not listed the table element position[i][j] as an instance variable at the beginning of the class. my question to people here is (1) is my assumption correct, and if so (2) what would be the syntax to declare instance variables of this form? Thank you all for your help with what I realize is a very basic question. Hopefully it will also benefit other newbies. Cheers, JDelage

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  • Warning: cast increases required alignment

    - by dash-tom-bang
    I'm recently working on this platform for which a legacy codebase issues a large number of "cast increases required alignment to N" warnings, where N is the size of the target of the cast. struct Message { int32_t id; int32_t type; int8_t data[16]; }; int32_t GetMessageInt(const Message& m) { return *reinterpret_cast<int32_t*>(&data[0]); } Hopefully it's obvious that a "real" implementation would be a bit more complex, but the basic point is that I've got data coming from somewhere, I know that it's aligned (because I need the id and type to be aligned), and yet I get the message that the cast is increasing the alignment, in the example case, to 4. Now I know that I can suppress the warning with an argument to the compiler, and I know that I can cast the bit inside the parentheses to void* first, but I don't really want to go through every bit of code that needs this sort of manipulation (there's a lot because we load a lot of data off of disk, and that data comes in as char buffers so that we can easily pointer-advance), but can anyone give me any other thoughts on this problem? I mean, to me it seems like such an important and common option that you wouldn't want to warn, and if there is actually the possibility of doing it wrong then suppressing the warning isn't going to help. Finally, can't the compiler know as I do how the object in question is actually aligned in the structure, so it should be able to not worry about the alignment on that particular object unless it got bumped a byte or two?

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  • Getting an exception when trying to use extension method with SortedDictionary... why?

    - by Polaris878
    I'm trying to place custom objects into a sorted dictionary... I am then trying to use an extension method (Max()) on this sorted dictionary. However, I'm getting the exception: "At least one object must implement IComparable". I don't understand why I'm getting that, as my custom object obviously implements IComparable. Here is my code: public class MyDate : IComparable<MyDate> { int IComparable<MyDate>.CompareTo(MyDate obj) { if (obj != null) { if (this.Value.Ticks < obj.Value.Ticks) { return 1; } else if (this.Value.Ticks == obj.Value.Ticks) { return 0; } else { return -1; } } } public MyDate(DateTime date) { this.Value = date; } public DateTime Value; } class Program { static void Main(string[] args) { SortedDictionary<MyDate, int> sd = new SortedDictionary<MyDate,int>(); sd.Add(new MyDate(new DateTime(1)), 1); sd.Add(new MyDate(new DateTime(2)), 2); Console.WriteLine(sd.Max().Value); // Throws exception!! } } What on earth am I doing wrong???

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  • getSystemResourceAsStream() returns null

    - by Hitesh Solanki
    Hiii... I want to get the content of properties file into InputStream class object using getSystemResourceAsStream(). I have built the sample code. It works well using main() method,but when i deploy the project and run on the server, properties file path cannot obtained ... so inputstream object store null value. Sample code is here.. public class ReadPropertyFromFile { public static Logger logger = Logger.getLogger(ReadPropertyFromFile.class); public static String readProperty(String fileName, String propertyName) { String value = null; try { //fileName = "api.properties"; //propertyName = "api_loginid"; System.out.println("11111111...In the read proprty file....."); // ClassLoader loader = ClassLoader.getSystemClassLoader(); InputStream inStream = ClassLoader.getSystemResourceAsStream(fileName); System.out.println("In the read proprty file....."); System.out.println("File Name :" + fileName); System.out.println("instream = "+inStream); Properties prop = new Properties(); try { prop.load(inStream); value = prop.getProperty(propertyName); } catch (Exception e) { logger.warn("Error occured while reading property " + propertyName + " = ", e); return null; } } catch (Exception e) { System.out.println("Exception = " + e); } return value; } public static void main(String args[]) { System.out.println("prop value = " + ReadPropertyFromFile.readProperty("api.properties", "api_loginid")); } }

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  • Flash compiler error 1061: Call to a possibly undefined method run... but run exists!

    - by Zane Geiger
    So I've been working on making a game in Processing but I think Flash would be a better way to get more people playing it, so I've decided to learn Flash. The problem is that I keep getting really stupid errors on incredibly simple things. For instance, I want to make a 'Block' object to use in a platform game. So I make a new .as file, name it Block.as, and define the Block class within it like so: package { public class Block { public function Block() { // constructor code } public function run() { } } } I don't want to add the code yet, I just want to ensure that this works. So in my main timeline code, I try to create an instance of the Block object and execute its run method: var block1:Block = new Block(); block1.run(); Every time it gives me this inane error: Scene 1, Layer 'Layer 1', Frame 1, Line 2 1061: Call to a possibly undefined method run through a reference with static type Block. What undefined method!? It's defined RIGHT THERE in Block.as. The class file is even in the same folder and everything. I'm getting REALLY annoyed at how poorly Flash handles such a ridiculously simple project. Does anyone know why Flash hates me?

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  • Invoking public method on a class in a different package via reflection

    - by KARASZI István
    I ran into the following problem. I have two different packages in package a I would like to call the implemented method of an interface in a package b but the implementing class has package visibility. So a simplifed code looks like this: package b; public final class Factory { public static B createB() { return new ImplB(); } public interface B { void method(); } static class ImplB implements B { public void method() { System.out.println("Called"); } } } and the Invoker: package a; import java.lang.reflect.Method; import b.Factory; import b.Factory.B; public final class Invoker { private static final Class<?>[] EMPTY_CLASS_ARRAY = new Class<?>[] {}; private static final Object[] EMPTY_OBJECT_ARRAY = new Object[] {}; public static void main(String... args) throws Exception { final B b = Factory.createB(); b.method(); final Method method = b.getClass().getDeclaredMethod("method", EMPTY_CLASS_ARRAY); method.invoke(b, EMPTY_OBJECT_ARRAY); } } When I start the program it prints out Called as expected and throws an Exception because the package visibility prohibits the calling of the discovered method. So my question is any way to solve this problem? Am I missing something in Java documentation or this is simply not possible although simply calling an implemented method is possible without reflection.

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