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  • Help with a compiler warning: Initialization from distinct Objective-C type when types match

    - by Alex Gosselin
    Here is the function where I get the compiler warning, I can't seem to figure out what is causing it. Any help is appreciated. -(void)displaySelector{ //warning on the following line: InstanceSelectorViewController *controller = [[InstanceSelectorViewController alloc] initWithCreator:self]; [self.navController pushViewController:controller animated:YES]; [controller release]; } Interface and implementation for the initWithCreator: method -(InstanceSelectorViewController*)initWithCreator:(InstanceCreator*)creator; -(InstanceSelectorViewController*)initWithCreator:(InstanceCreator*)crt{ if (self = [self initWithNibName:@"InstanceSelectorViewController" bundle:nil]) { creator = crt; } return self; }

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  • Embedded file system and sqlite

    - by Jeff Lamb
    I'm working on an embedded project that has no file system, and our kludge of a database has ballooned in functionality. It's now so inefficient, we can't stand it any longer. I'm trying to figure out if there's built-in support for a flat file system in SQLite. I've dug around http://sqlite.org for a while now, but haven't found anything specifically covering it. Has anyone found a supported implementation written in C? It seems like such a straightforward request, but I can't find anything written about it. We have plenty of memory available. In a perfect world, I'd like to just set aside a large portion of it, pass the FS a pointer, then let the FS/SQLite library just use what it wants.

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  • Logging IP address for uniqueness without storing the IP address itself for privacy

    - by szabgab
    In a web application when logging some data I'd like to make sure I can identify data that came at differetn times but from the same IP address. On the other hand for privacy concerns as the data will be released publicly I'd like to make sure the actual IP cannot be retrieved. So I need some one way mapping of the IP addresses to some other strings that ensures 1-1 mapping. If I understand correctly then MD5, SHA1 or SHA256 could be a solution. I wonder if they are not too expensive in terms of processing needed? I'd be interested in any solution though if there is implementation in Perl that would be even better.

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  • Objective-C: how to prevent abstraction leaks

    - by iter
    I gather that in Objective-C I must declare instance variables as part of the interface of my class even if these variables are implementation details and have private access. In "subjective" C, I can declare a variable in my .c file and it is not visible outside of that compilation unit. I can declare it in the corresponding .h file, and then anyone who links in that compilation unit can see the variable. I wonder if there is an equivalent choice in Objective-C, or if I must indeed declare every ivar in the .h for my class. Ari.

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  • XML/SOAP attributes for a complextype in kSOAP

    - by Soumya
    Hi, I'm trying to parse a SOAP response that contains nested ComplexTypes using the kSOAP library on Android 2.1. <event att1="value1" att2="value2" att3="value3"> <tag2> ... </tag2> <tag3> ... </tag3> </event> I've implemented my own class Event that implements org.ksoap2.serialization.KvmSerializable to parse this response. It is not clear to me if and how I can parse the attributes (att1, att2 and att3) of the event node. Is it even possible with the current kSOAP implementation? Thanks.

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  • How To Create An ASP.NET Designer Host

    - by Zuhaib
    I have been asked to build an application where I can drag and drop few WebControls onto the WebPage designer surface. So far I have read some articles on .NET Framework Design-Time architecture, like, MSDN Article: Hosting WinForms Designers, Developer Function Article etc. But I can't a find a way to host WebForms designer. The only open source implementation that I could find was Mono Develop ASP.NET Visual Designer. But in mono they have used GTK# & Gecko etc to host the designer. I can't find a way to do the same using WinForms. Please suggest me what should I do. Give me some pointers. Should I go ahead and implement it using GTK# and Gecko? PS: My requirement is not very huge. I need just a way to drag and drop simple web controls and save the page.

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  • Resolving IEnumerable<T> with Unity

    - by Mark Seemann
    Can Unity automatically resolve IEnumerable<T>? Let's say I have a class with this constructor: public CoalescingParserSelector(IEnumerable<IParserBuilder> parserBuilders) and I configure individual IParserBuilder instances in the container: container.RegisterType<IParserSelector, CoalescingParserSelector>(); container.RegisterType<IParserBuilder, HelpParserBuilder>(); container.RegisterType<IParserBuilder, SomeOtherParserBuilder>(); can I make this work without having to implement a custom implementation of IEnumerable<IParserBuilder>? var selector = container.Resolve<IParserSelector>(); So far I haven't been able to express this in any simple way, but I'm still ramping up on Unity so I may have missed something.

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  • Must I call super when I implement -scrollViewDidScroll: of UIScrollViewDelegate in an UITableView?

    - by mystify
    I made a custom UITableView subclass and implemented this: - (void)scrollViewDidScroll:(UIScrollView *)scrollView { // scrolled... } Now, what I think is that UITableView may also love to get this message for some obvious reasons. However, when I don't forward that to super, for some reason, everything still works fine. Must I forward that guy to super? I mean...it's a delegate method implementation, but as far as I'm aware of, this would still override anything implemented in UITableView, or not? Edit: I see...the delegate could be anyone. Never mind about this. BUT: What I have such a thing in a superclass, and make a subclass. How would I even know that the superclass does implement that method and I must forward it to super?

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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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  • Nested class or not nested class?

    - by eriks
    I have class A and list of A objects. A has a function f that should be executed every X seconds (for the first instance every 1 second, for the seconds instance every 5 seconds, etc.). I have a scheduler class that is responsible to execute the functions at the correct time. What i thought to do is to create a new class, ATime, that will hold ptr to A instance and the time A::f should be executed. The scheduler will hold a min priority queue of Atime. Do you think it is the correct implementation? Should ATime be a nested class of the scheduler?

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  • License Check before executing

    - by jaklucky
    Hi, We have an application (written in C# on .NET Framework 3.5) that is licensed using our custom licensing mechanism. In the current implementation, in each method we first check for if the machine has valid license or not. To me, it is little bit awkward. Is there any way to let the runtime check for the license before creating the object or excuting a method? Will writing a custom attribute solves this problem? Any ideas or solutions are greatly appreciated. Thank you, Suresh

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  • iPad Simulator WebView/Google Maps API Issue

    - by EagleOfToledo
    I've only recently updated XCode to 3.2.2 and started to play with the iPad simulator. I am having an issue with a WebView. I am using it to load a url with a Google Maps API implementation. The map loads and displays properly but when I try and click and drag on it to pan the map around instead of the map being panned the whole webview is scrolled vertically, revealing the dark grey background. When I release it it bounces back into place. Also when I hold the option key down to pinch the map it does not respond. If I load the map.google.com page the map pans just fine and is responsive, but not my one. No special code here, just the usual NSUrlRequest. It works fine in the iPhone simulator, but not the iPad simulator. User Interaction Enabled is also checked. Any thoughts on why this is happening?

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  • Multiple skins in ASP.NET MVC using StringTemplate

    - by Jamie
    I am considering the StringTemplate view engine for my ASP.NET MVC application. This application will be built with one skin, but I then expect many more, often very similar skins to be developed for it. This is primiarly the reason for my choice of StringTemplate as the view engine, as there will be zero logic in the views. In my head, I envisaged having each skin in a directory under the 'Views' directory in the folder structure, then maintaining a data structure which maps hostnames to skin directories. An obvious disadvantage of this approach is that I will have to explicitly specify my view files - an alternative might be to hack the implementation of the View() method to change the /views/controller/action standard path and insert an extra layer. Is anyone aware of any examples of implementations along these lines using ASP.NET MVC and StringTemplate at present? Can anyone forsee any potential problems with my approach? Thanks in advance.

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  • ERR_INCOMPLETE_CHUNKED_ENCODING apache 2.4

    - by Bujanca Mihai
    I upgraded my Ubuntu server to 14.04 and Apache 2.4.7. Now my images don't load and console yields net::ERR_INCOMPLETE_CHUNKED_ENCODING. Also, I can sometimes see some of the images load for a little while (1 sec max) and then they disappear. .htaccess RewriteEngine On # Serve the favicon file from img folder RewriteCond %{REQUEST_URI} ^/favicon.ico$ RewriteRule ^(.*)$ /img/$1 [NC,L] # Redirect HTTP traffic to WWW subdomain RewriteCond %{HTTPS} off [NC] RewriteCond %{HTTP_HOST} !^www\. [NC] RewriteRule ^(.*)$ http://www.%{HTTP_HOST}/$1 [R=301,L] # Redirect HTTPS traffic to WWW subdomain RewriteCond %{HTTPS} on [NC] RewriteCond %{HTTP_HOST} !^www\. [NC] RewriteRule ^(.*)$ https://www.%{HTTP_HOST}/$1 [R=301,L] # Auto Versioning rules RewriteCond %{REQUEST_FILENAME} !-s RewriteRule ^(.*)\.[\d]+\.(css|js)$ $1.$2 [L] # Default Zend rewrite rules RewriteCond %{REQUEST_FILENAME} -s [OR] RewriteCond %{REQUEST_FILENAME} -l [OR] RewriteCond %{REQUEST_FILENAME} -d RewriteRule ^.*$ - [NC,L] RewriteRule ^.*$ index.php [NC,L] VHost <VirtualHost *:80> ServerAdmin admin@localhost ServerName localhost DocumentRoot /home/mihai/ARTD/www/public/website # Omit this in production environment SetEnv APPLICATION_ENV local <Directory /home/mihai/ARTD/www/public/website > Options Indexes FollowSymLinks MultiViews AllowOverride All #Order deny,allow #Allow from all Require all granted </Directory> <IfModule mod_php5.c> php_value memory_limit 128M php_value upload_max_filesize 20M php_value post_max_size 20M </IfModule> ErrorLog /var/log/apache2/ARTD-error.log # Possible values include: debug, info, notice, warn, error, crit, # alert, emerg. LogLevel warn CustomLog /var/log/apache2/ARTD-access.log combined </VirtualHost> <IfModule mod_ssl.c> <VirtualHost *:443> ServerAdmin admin@localhost ServerName localhost DocumentRoot /home/mihai/ARTD/www/public/website # Omit this in production environment SetEnv APPLICATION_ENV local <Directory /home/mihai/ARTD/www/public/website > Options Indexes FollowSymLinks MultiViews AllowOverride All #Order deny,allow #Allow from all Require all granted </Directory> <IfModule mod_php5.c> php_value memory_limit 128M php_value upload_max_filesize 20M php_value post_max_size 20M </IfModule> ErrorLog /var/log/apache2/ARTD-ssl-error.log # Possible values include: debug, info, notice, warn, error, crit, # alert, emerg. LogLevel warn CustomLog /var/log/apache2/ARTD.log combined # SSL Engine Switch: # Enable/Disable SSL for this virtual host. SSLEngine on # A self-signed (snakeoil) certificate can be created by installing # the ssl-cert package. See # /usr/share/doc/apache2.2-common/README.Debian.gz for more info. # If both key and certificate are stored in the same file, only the # SSLCertificateFile directive is needed. SSLCertificateFile /etc/ssl/certs/ssl-cert-snakeoil.pem SSLCertificateKeyFile /etc/ssl/private/ssl-cert-snakeoil.key # Server Certificate Chain: # Point SSLCertificateChainFile at a file containing the # concatenation of PEM encoded CA certificates which form the # certificate chain for the server certificate. Alternatively # the referenced file can be the same as SSLCertificateFile # when the CA certificates are directly appended to the server # certificate for convinience. #SSLCertificateChainFile /etc/apache2/ssl.crt/server-ca.crt # Certificate Authority (CA): # Set the CA certificate verification path where to find CA # certificates for client authentication or alternatively one # huge file containing all of them (file must be PEM encoded) # Note: Inside SSLCACertificatePath you need hash symlinks # to point to the certificate files. Use the provided # Makefile to update the hash symlinks after changes. #SSLCACertificatePath /etc/ssl/certs/ #SSLCACertificateFile /etc/apache2/ssl.crt/ca-bundle.crt # Certificate Revocation Lists (CRL): # Set the CA revocation path where to find CA CRLs for client # authentication or alternatively one huge file containing all # of them (file must be PEM encoded) # Note: Inside SSLCARevocationPath you need hash symlinks # to point to the certificate files. Use the provided # Makefile to update the hash symlinks after changes. #SSLCARevocationPath /etc/apache2/ssl.crl/ #SSLCARevocationFile /etc/apache2/ssl.crl/ca-bundle.crl # Client Authentication (Type): # Client certificate verification type and depth. Types are # none, optional, require and optional_no_ca. Depth is a # number which specifies how deeply to verify the certificate # issuer chain before deciding the certificate is not valid. #SSLVerifyClient require #SSLVerifyDepth 10 # Access Control: # With SSLRequire you can do per-directory access control based # on arbitrary complex boolean expressions containing server # variable checks and other lookup directives. The syntax is a # mixture between C and Perl. See the mod_ssl documentation # for more details. #<Location /> #SSLRequire ( %{SSL_CIPHER} !~ m/^(EXP|NULL)/ \ # and %{SSL_CLIENT_S_DN_O} eq "Snake Oil, Ltd." \ # and %{SSL_CLIENT_S_DN_OU} in {"Staff", "CA", "Dev"} \ # and %{TIME_WDAY} >= 1 and %{TIME_WDAY} <= 5 \ # and %{TIME_HOUR} >= 8 and %{TIME_HOUR} <= 20 ) \ # or %{REMOTE_ADDR} =~ m/^192\.76\.162\.[0-9]+$/ #</Location> # SSL Engine Options: # Set various options for the SSL engine. # o FakeBasicAuth: # Translate the client X.509 into a Basic Authorisation. This means that # the standard Auth/DBMAuth methods can be used for access control. The # user name is the `one line' version of the client's X.509 certificate. # Note that no password is obtained from the user. Every entry in the user # file needs this password: `xxj31ZMTZzkVA'. # o ExportCertData: # This exports two additional environment variables: SSL_CLIENT_CERT and # SSL_SERVER_CERT. These contain the PEM-encoded certificates of the # server (always existing) and the client (only existing when client # authentication is used). This can be used to import the certificates # into CGI scripts. # o StdEnvVars: # This exports the standard SSL/TLS related `SSL_*' environment variables. # Per default this exportation is switched off for performance reasons, # because the extraction step is an expensive operation and is usually # useless for serving static content. So one usually enables the # exportation for CGI and SSI requests only. # o StrictRequire: # This denies access when "SSLRequireSSL" or "SSLRequire" applied even # under a "Satisfy any" situation, i.e. when it applies access is denied # and no other module can change it. # o OptRenegotiate: # This enables optimized SSL connection renegotiation handling when SSL # directives are used in per-directory context. #SSLOptions +FakeBasicAuth +ExportCertData +StrictRequire #<FilesMatch "\.(cgi|shtml|phtml|php)$"> # SSLOptions +StdEnvVars #</FilesMatch> # SSL Protocol Adjustments: # The safe and default but still SSL/TLS standard compliant shutdown # approach is that mod_ssl sends the close notify alert but doesn't wait for # the close notify alert from client. When you need a different shutdown # approach you can use one of the following variables: # o ssl-unclean-shutdown: # This forces an unclean shutdown when the connection is closed, i.e. no # SSL close notify alert is send or allowed to received. This violates # the SSL/TLS standard but is needed for some brain-dead browsers. Use # this when you receive I/O errors because of the standard approach where # mod_ssl sends the close notify alert. # o ssl-accurate-shutdown: # This forces an accurate shutdown when the connection is closed, i.e. a # SSL close notify alert is send and mod_ssl waits for the close notify # alert of the client. This is 100% SSL/TLS standard compliant, but in # practice often causes hanging connections with brain-dead browsers. Use # this only for browsers where you know that their SSL implementation # works correctly. # Notice: Most problems of broken clients are also related to the HTTP # keep-alive facility, so you usually additionally want to disable # keep-alive for those clients, too. Use variable "nokeepalive" for this. # Similarly, one has to force some clients to use HTTP/1.0 to workaround # their broken HTTP/1.1 implementation. Use variables "downgrade-1.0" and # "force-response-1.0" for this. #BrowserMatch ".*MSIE.*" \ # nokeepalive ssl-unclean-shutdown \ # downgrade-1.0 force-response-1.0 </VirtualHost> </IfModule> logs Apache/2.4.7 (Ubuntu) PHP/5.5.9-1ubuntu4.3 OpenSSL/1.0.1f (internal dummy connection) 127.0.0.1 - - [25/Aug/2014:13:09:53 +0300] "GET /img/header/top-nav-separator.png HTTP/1.1" 200 462 "https://localhost/art" "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/34.0.1847.132 Safari/537.36"

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  • Could the HTML 5 Video tag pick up an IP Multicast Stream?

    - by DrewBarbs
    I've been researching methods of getting an IP Multicast over UDP to the browser, and have found little that suggests I would be able to do it without using a plug-in like Java, Flash, or Silverlight in order to open a UDP port and (somehow) render the video. Checking out the HTML 5 <video> spec, there is (obviously) little in the way of specific implementation details, so as far as I can tell, there is nothing stopping a browser from parsing a address of the form "udp://224.1.1.1:8000" and joining a multicast group on that IP/port. Is this a correct understanding? Or must the resource pointed to by the <source> be a file?

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  • SOLVED mwfeedparser integrating in my app gives EXC_BAD_ACCESS (code=1, address=0xa0040008)

    - by Pranoy C
    SOLVED- Got it! The problem was that since I am creating the DoParsingStuff *parseThisUrl object in the viewDidLoad method, it's scope was only within that method. So after the method finished, the object got deallocated. I changed it to an instance variable instead and now it works. It gives a different error but that it an entirely different issue. Issue was: I have been struggling with trying to integrate the mwfeedparser library in my app for parsing RSS and ATOM feeds. It throws a gives EXC_BAD_ACCESS error which I can't seem to troubleshoot. //My Class looks like - My interface looks like: #import <Foundation/Foundation.h> #import "MWFeedParser.h" #import "NSString+HTML.h" @protocol ParseCompleted <NSObject> -(void)parsedArray:(NSMutableArray *)parsedArray; @end @interface DoParsingStuff : NSObject<MWFeedParserDelegate> @property (nonatomic,strong) NSMutableArray *parsedItems; @property (nonatomic, strong) NSArray *itemsToDisplay; @property (nonatomic,strong) MWFeedParser *feedParser; @property (nonatomic,strong) NSURL *feedurl; @property (nonatomic,strong) id <ParseCompleted> delegate; -(id)initWithFeedURL:(NSURL *)url; @end //And Implementaion: #import "DoParsingStuff.h" @implementation DoParsingStuff @synthesize parsedItems = _parsedItems; @synthesize itemsToDisplay = _itemsToDisplay; @synthesize feedParser = _feedParser; @synthesize feedurl=_feedurl; @synthesize delegate = _delegate; -(id)initWithFeedURL:(NSURL *)url{ if(self = [super init]){ _feedurl=url; _feedParser = [[MWFeedParser alloc] initWithFeedURL:_feedurl]; _feedParser.delegate=self; _feedParser.feedParseType=ParseTypeFull; _feedParser.connectionType=ConnectionTypeAsynchronously; } return self; } -(void)doParsing{ BOOL y = [_feedParser parse]; } # pragma mark - # pragma mark MWFeedParserDelegate - (void)feedParserDidStart:(MWFeedParser *)parser { //Just tells what url is being parsed e.g. http://www.wired.com/reviews/feeds/latestProductsRss NSLog(@"Started Parsing: %@", parser.url); } - (void)feedParser:(MWFeedParser *)parser didParseFeedInfo:(MWFeedInfo *)info { //What is the Feed about e.g. "Product Reviews" NSLog(@"Parsed Feed Info: “%@”", info.title); //self.title = info.title; } - (void)feedParser:(MWFeedParser *)parser didParseFeedItem:(MWFeedItem *)item { //Prints current element's title e.g. “An Arthropod for Your iDevices” NSLog(@"Parsed Feed Item: “%@”", item.title); if (item) [_parsedItems addObject:item]; } - (void)feedParserDidFinish:(MWFeedParser *)parser {//This is where you can do your own stuff with the parsed items NSLog(@"Finished Parsing%@", (parser.stopped ? @" (Stopped)" : @"")); [_delegate parsedArray:_parsedItems]; //[self updateTableWithParsedItems]; } - (void)feedParser:(MWFeedParser *)parser didFailWithError:(NSError *)error { NSLog(@"Finished Parsing With Error: %@", error); if (_parsedItems.count == 0) { //self.title = @"Failed"; // Show failed message in title } else { // Failed but some items parsed, so show and inform of error UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Parsing Incomplete" message:@"There was an error during the parsing of this feed. Not all of the feed items could parsed." delegate:nil cancelButtonTitle:@"Dismiss" otherButtonTitles:nil]; [alert show]; } //[self updateTableWithParsedItems]; } @end //I am calling this from my main viewcontroller as such: #import "DoParsingStuff.h" @interface ViewController : UIViewController <ParseCompleted> .... //And I have the following methods in my implementation: DoParsingStuff *parseThisUrl = [[DoParsingStuff alloc] initWithFeedURL:[NSURL URLWithString:@"http://www.theverge.com/rss/index.xml"]]; parseThisUrl.delegate=self; [parseThisUrl doParsing]; I have the method defined here as- -(void)parsedArray:(NSMutableArray *)parsedArray{ NSLog(@"%@",parsedArray); } //I stepped through breakpoints- When I try to go through the breakpoints, I see that everything goes fine till the very last [parseThisUrl doParsing]; in my delegate class. After that it starts showing me memory registers where I get lost. I think it could be due to arc as I have disabled arc on the mwfeedparser files but am using arc in the above classes. If you need the entire project for this, let me know. I tried it with NSZombies enabled and got a bit more info out of it: -[DoParsingStuff respondsToSelector:]: message sent to deallocated instance 0x6a52480 I am not using release/autorelease/retain etc. in this class...but it is being used in the mwfeedparser library.

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  • iPhone: How to store a location (CLLocationCoordinate2D) inside a class w/o leaking memory?

    - by Henry
    I am creating a library which contains an API for setting the current location based off some value collected by the GPS. I want to store this location in my class and later, change the behavior of my library if it is set. What I had in mind was: @interface myLib { @property (nonatomic, retain) CLLocationCoordinate2D *location; } @implementation myLib { @synthesize location = _location; - (void)setLocation:(CLLocationCoordinate2D *)loc { location = loc; } - (void)someFunc { if (location != nil) ... } } However, retain isn't a valid property for a CLLocationCoordinate2D object. So, what is the proper way to save CLLocationCoordinate2D for later use w/o wasting memory? Thanks in advance!

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  • willRotateToInterfaceOrientation:duration: not called for iOS5 after dismissing from modal

    - by Jean-Denis Muys
    My main UIViewController overrides willRotateToInterfaceOrientation:duration: to adapt the background view for the correct orientation. This works fine when staying within the view. But in my app, the result of some user actions can lead to presenting another "daughter" UIViewController. When the user is done with that daughter UIViewController, she normally returns to the main view controller. My code calls dismissModalViewControllerAnimated: to do so. The issue occurs when the user changes the iPad orientation while the daughter UIViewController is on screen. Then, the main UIViewController will never see any call to willRotateToInterfaceOrientation:duration: and its background view will be incorrect. This setup works fine in iOS 4: the iOS 4 implementation of dismissModalViewControllerAnimated: calls UIWindow's _setRotatableClient:toOrientation:updateStatusBar:duration:force: which calls willRotateToInterfaceOrientation:duration: for the switched in UIViewController. Apparently , this behavior changed for iOS 5. How am I expected to implemented orientation changes while my view is off screen under iOS5? Am I supposed to query the current orientation in viewWillAppear: for example?

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  • Implementing a Patricia Trie for use as a dictionary

    - by Regis Frey
    I'm attempting to implement a Patricia Trie with the methods addWord(), isWord(), and isPrefix() as a means to store a large dictionary of words for quick retrieval (including prefix search). I've read up on the concepts but they just aren't clarifying into an implementation. I want to know (in Java or Python code) how to implement the Trie, particularly the nodes (or should I implement it recursively). I saw one person who implemented it with an array of 26 child nodes set to null/None. Is there a better strategy (such as treating the letters as bits) and how would you implement it?

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  • RDLC - Adding a Data Source in VS2010

    - by Kezzer
    Greetings. I have an RDLC file and am wanting to add a data source to it, although without any luck so far. The data source is a custom class written by myself (just to add, we do this all the time). We recently converted over to the VS2010 RDLC format which caused some problems, but we've made some changes to our implementation that workaround the more major issues. So, back to the issue at hand, when I attempt to add my data source to the DummyDataSource list in the RDLC view in VS2010 it just does nothing, however it does add the data source to the list of data sources, but you can't select it from the drop-down list in the RDLC view which means I can't add the data source at all. Has anyone come across this problem? Is there anything I need to check? I've searched with fervour and had no luck.

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  • How can I implement an abstract singleton class in Java?

    - by Simon
    Here is my sample abstract singleton class: public abstract class A { protected static A instance; public static A getInstance() { return instance; } //...rest of my abstract methods... } And here is the concrete implementation: public class B extends A { private B() { } static { instance = new B(); } //...implementations of my abstract methods... } Unfortunately I can't get the static code in class B to execute, so the instance variable never gets set. I have tried this: Class c = B.class; A.getInstance() - returns null; and this ClassLoader.getSystemClassLoader().loadClass("B"); A.getInstance() - return null; Running both these in the eclipse debugger the static code never gets executed. The only way I could find to get the static code executed is to change the accessibility on B's constructor to public, and to call it. I'm using sun-java6-jre on Ubuntu 32bit to run these tests.

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  • Silverlight RIA Services. Query fails on large table but works with Where clause

    - by FauxReal
    I have a somewhat large table, maybe 2000 rows by 50 columns. When using the most basic imaginable RIA implementation. Create one-table Model Create DomainService Drop datagrid onto MainPage.xaml Drop datasource onto datagrid Ctrl-F5 I get this error: System.ServiceModel.DomainServices.Client.DomainOperationException: Load operation faild for query. Value cannot be null. Error is much larger, but thats the beginning of it. The weird thing is that if I narrow the results down with a where clause on the GetQuery, it works fine. In fact six different querys which together result in all of the rows being called works fine also. So basically, I'm sure its not some sort of rogue row. Why do I get this "Value cannot be null" error if I query the whole table? Thanks

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  • Serialize struct with pointers to NSData

    - by leolobato
    Hey guys, I need to add some kind of archiving functionality to a Objective-C Trie implementation (NDTrie on github), but I have very little experience with C and it's data structures. struct trieNode { NSUInteger key; NSUInteger count, size; id object; __strong struct trieNode ** children; __strong struct trieNode * parent; }; @interface NDTrie (Private) - (struct trieNode*)root; @end What I need is to create an NSData with the tree structure from that root - or serialize/deserialize the whole tree some other way (conforming to NSCoding?), but I have no clue how to work with NSData and a C struct containing pointers. Performance on deserializing the resulting object would be crucial, as this is an iPhone project and I will need to load it in the background every time the app starts. What would be the best way to achieve this? Thanks!

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  • Where can I find Object Model Documentation for Microsoft Expression Web Add-ins

    - by JonStonecash
    I am working on an add-in for Microsoft Expression Web. I have gotten enough information on the web to know that I have to add references to Microsoft.Expression.Interop.WebDesigner, Microsoft.Expression.Interop.WebDesignerPage, and Microsoft.Expression.Interop.WebDesigner. The problem is that there does not seem to be any official documentation on the classes within these dll-s. There is even a Microsoft Connect issue about the lack of documentation. I have been using the object browser in Visual Studio 2008 and Reflector but that is pretty thin soup. Does anyone know where there is some reasonable documentation. I am not looking for a sample "hello world" implementation. I want some more substance and depth.

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  • How to create Python module distribution to gracefully fall-back to pure Python code

    - by Craig McQueen
    I have written a Python module, and I have two versions: a pure Python implementation and a C extension. I've written the __init__.py file so that it tries to import the C extension, and if that fails, it imports the pure Python code (is that reasonable?). Now, I'd like to know what is the best way to distribute this module (e.g. write setup.py) so it can be easily used by people with or without the facility to build, or use, the C extension, just by running: python setup.py install My experience is limited, but I see two possible cases: User does not have MS Visual Studio, or the GCC compiler suite, installed on their machine, to build the C extension User is running IronPython, Jython, or anything other than CPython. I only have used CPython. So I'm not sure how I could distribute this module so that it would work smoothly and be easy to install on those platforms, if they're unable to use the C extension.

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