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• Image Wells, Core Data, and Sqlite files.

  - by Sway

  I've got a mac application that I've developed. I use it to create sqlite files that are bundled with my iphone app. The mac app uses Core Data and bindings and is working fine except for one "weird" issue. I use an NSImageView (or Image Well) to allow me to drag and drop jpg files. This is bound through to an optional binary attribute in my model class. For some reason when I drag and drop a 4k jpg file it onto the image well and save the sqlite file. The data saved to the binary column is over 15 times larger than it should be. Whereas if I use an application like SQLiteManager and add the image into the row in the database. The binary data is the correct (expected size). File 4k jpg Actual size: 2371. Persisted via Core Data size: 35810. Can anyone give me a suggestion as to why this might be happening? Do I need to set some setting in Interface Builder or write some custom code?

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• Aliasing Resources (WPF)

  - by Noldorin

  I am trying to alias a resource in XAML, as follows: <UserControl.Resources> <StaticResourceExtension x:Key="newName" ResourceKey="oldName"/> </UserControl.Resources> oldName simply refers to a resource of type Image, defined in App.xaml. As far as I understand, this is the correct way to do this, and should work fine. However, the XAML code gives me the superbly unhelpful error: "The application XAML file failed to load. Fix errors in the application XAML before opening other XAML files." This appears when I hover over the StaticResourceExtension line in the code (which has a squiggly underline). Several other errors are generated in the actual Error List, but seem to be fairly irrelevant and nonsenical (such messages as "The name 'InitializeComponent' does not exist in the current context"), as they all disappear when the line is removed. I'm completely stumped here. Why is WPF complaining about this code? Any ideas as to a resolution please? Note: I'm using WPF in .NET 3.5 SP1. Update 1: I should clairfy that I do receive compiler errors (the aforementioned messages in the Error List), so it's not just a designer problem. Update 2: Here's the relevant code in full... In App.xaml (under Application.Resource): <Image x:Key="bulletArrowUp" Source="Images/Icons/bullet_arrow_up.png" Stretch="None"/> <Image x:Key="bulletArrowDown" Source="Images/Icons/bullet_arrow_down.png" Stretch="None"/> And in MyUserControl.xaml (under UserControl.Resources): <StaticResourceExtension x:Key="columnHeaderSortUpImage" ResourceKey="bulletArrowUp"/> <StaticResourceExtension x:Key="columnHeaderSortDownImage" ResourceKey="bulletArrowDown"/> These are the lines that generate the errors, of course.

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• How to "escape" the JavaScript class keyword to specify a CSS class value.

  - by Robert Claypool

  C# allows a reserved word to be used as a property name via the ampersand. e.g. // In ASP.NET MVC, we use @class to define // the css class attribute for some HtmlHelper methods. var htmlObject = new { readonly = "readonly", @class = "ui-state-highlight" } I want to do the same in JavaScript. e.g. function makeGrid(grid, pager) { grid.jqGrid({ caption: 'Configurations', colNames: ['Id', 'Name'], colModel: [ { name: 'Id', index: 'Id' }, { name: 'Name', index: 'Name', editable: true, editoptions: { readonly: 'readonly', class: 'FormElement readonly' } }, ], pager: pager, url: 'www.example.com/app/configurations") %>', editurl: 'www.example.com/app/configurations/edit") %>' }).navGrid(pager, { edit: true, add: false, del: false, search: false }, {}, {}, {}); } Note class: 'FormElement readonly' is supposed to set the css class value on jqGrid's edit dialog, but IE errors out on the reserved word. Is there an escape character in JavaScript too? #class? @class? &class? Otherwise, how might I tell jqGrid to set the css class on the popup editor? Thank you.

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• Testing background audio in the simulator

  - by Cactuar

  I'm experimenting with the new background audio service in iPhone OS 4.0 but I can't get it to work in the simulator. According to this page: iPhone Application Programming Guide: Executing Code in the Background it seems that all I have to do is add the a UIBackgroundModes key with an array containing audio to my Info.plist file and the audio my application plays should automatically continue when I switch to another app. I have done this but the audio still pauses as I switch to another app, when I switch back it continues where it left off. This is the code I'm using to play the sound: NSURL *url = [NSURL fileURLWithPath:[NSString stringWithFormat:@"%@/audio.mp3", [[NSBundle mainBundle] resourcePath]]]; NSError *error; audioPlayer = [[AVAudioPlayer alloc] initWithContentsOfURL:url error:&error]; audioPlayer.numberOfLoops = -1; if (audioPlayer == nil) NSLog(@"%@", [error userInfo]); else [audioPlayer play]; Has anyone gotten this to work? Could it be that it would work on an actual device and it's just a problem with the simulator? I'm a bit hesitant to install 4.0 on my phone since I've heard it's still very buggy. Wish I had another device to use only for development.

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• Does anyone know of a good Commercial WPF Web Browser Control?

  - by VoidDweller

  I have an MDI WPF app that I need to add web content too. At first, great it looks like I have 2 options built into the framework the Frame control and the WebBrowser control. Given that this is an MDI app it doesn't take long to discover that neither of these will work. The WebBrowser control wraps up the IE WebBrowser ActiveX Control which uses the Win32 graphics pipeline. The "Airspace" issue pretty much sums this up as "Sorry, the layouts will not play nice together". Yes, I have thought about taking snapshots of the web content rendering these and mapping the mouse and keyboard events back to the browser control, but I can't afford the performance penalty and I really don't have time to write and thoroughly test it. I have looked for third party controls, but so far I have only found Chris Cavanagh's WPF Chromium Web Browser control. Which wraps up Awesomium 1.5. Together these are very cool, they play nice with the WPF layouts. But they do not meet my performance requirements. They are VERY HEAVY on memory consumption and not to friendly with CPU usage either. Not to mention still quite buggy. I'll elaborate if you are interested. So, do any of you know of a stable performant WPF web browser control? Thanks.

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• Exporting/Importing events to Outlook 2007 calendar - problem

  - by iandisme

  I work on a web app that involves scheduling. A user can view his schedule, and then download a meeting request file for a particular event. In Outlook 2003, simply opening this event would cause a meeting request to pop up and the user could accept, which would either add or update the event in their calendar. However, in Outlook 2007, the meeting request Accept function is disabled, and the reason given is that the user is the organizer and can't accept his own event request. The ICS file clearly shows that this is not the case. Has anyone experienced this same problem? Does anyone know how to work around it? (Using Outlook's import function is scarcely an option because it causes duplicate events to be created; the import function doesn't seem to care that the events have the same UID) Here is the ICS file: BEGIN:VCALENDAR PRODID:#{my app} VERSION:2.0 CALSCALE:GREGORIAN METHOD:REQUEST BEGIN:VEVENT DTSTAMP:20100324T150236Z UID:eeb639a1-f8e5-4eab-ab3c-232ad91364c6 SEQUENCE:2 ORGANIZER:#{myApp}.#{myDomain}.com DESCRIPTION: DTSTART;TZID=Europe/London:20110620T120010 DTEND;TZID=Europe/London:20110620T133010 SUMMARY:BREAK:Breakfast LOCATION:Room 101 END:VEVENT BEGIN:VTIMEZONE //Timezone info edited for brevity END:VTIMEZONE END:VCALENDAR

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• Cucumber Error: Socket Error for Test Environment Host in REST API

  - by tmo256

  I posted this to the Cucumber group with no replies, which makes me wonder if this is actually a cucumber issue or not. I'm pretty new to cucumber, and there are a number of things I really don't quite understand about how the cucumber environment is set up and executed within the test environment. I have a REST API rails app I'm testing with cucumber, using the RestClient gem to generate a post to controller create action. When I run the feature with a hard-coded URL pointing to a running localhost server (my local dev server environment; replacing tickets_url with "http:// localhost/tickets" in the snippet below), my cucumber steps execute as expected. However, when the resource URL resolves to the cucumber host I'm declaring, I get a socket error exception. getaddrinfo: nodename nor servname provided, or not known (SocketError) From the steps file: When /^POS Adapter sends JSON data to the Tickets resource$/ do ticket = { :ticket = { ... } } host! "test.host" puts tickets_url RestClient.post tickets_url, ticket.to_json, :content_type = :json, :accepts = :json end (the "puts" statement prints "http://test.host/tickets") Using the following gems: cucumber-0.6.1 webrat-0.6.0 rest-client-1.2.0 I should also say I have a similar set up in another rails app, using test.host as my host, and it seems to work fine. I'd appreciate any insight on what I might be missing in my configuration or what this could be related to.

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• Silverlight WCF service consuming inherited types in datacontract

  - by RemotecUk

  Hi, Im trying to consume a WCF service in silverlight... What I have done is to create two seperate assemblies for my datacontracts... Assembly that contains all of my types marked with data contracts build against .Net 3.5 A Silverlight assembly which links to files in the 1st assembly. This means my .Net app can reference assembly 1 and my silverlight app assembly 2. This works fine and I can communicate across the service. The problems occur when I try to transfer inherited classed. I have the following class stucture... IFlight - an interface for all types of flights. BaseFlight : IFlight - a baseflight flight implements IFlight AdhocFlight : BaseFlight, IFlight - an adhoc flight inherits from baseflight and also implements IFlight. I can successfully transfer base flights across the service. However I really need to be able to transfer objects of IFlight across the interface as I want one operation contract that can transfer many types of flight... public IFlight GetFlightBooking() { AdhocFlight af = new AdhocFlight(); return af; } ... should work I think? However I get the error: "The server did not provide a meaningful reply; this might be caused by a contract mismatch, a premature session shutdown or an internal server error." Any ideas would be appreciated.

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• asyncsocket Write Issue

  - by James

  I am attempting to use asyncsocket to communicate GPS data from a server app on my iPhone to a client app on my macbook. The two devices connect without any problems, and when the first data is sent from the iPhone to the laptop in asyncsocket's didConnectToHost method, the data is sent without hiccup. When I subsequently try to write additional data to the laptop from the locationManager method, however, no data is written. Here is the code: - (void)locationManager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation *)newLocation fromLocation:(CLLocation *)oldLocation { lat = [NSNumber numberWithFloat:newLocation.coordinate.latitude]; [lat retain]; NSLog(@"lat: %1.0f", [lat floatValue]); NSString *msg = [NSString stringWithFormat:@"%1.0f", [lat floatValue]]; NSData *msgData = [msg dataUsingEncoding:NSUTF8StringEncoding]; [listenSocket writeData:msgData withTimeout:-1 tag:0]; } listensocket is my instance of ASyncSocket. I know that no data is being sent because after the initial successful transfer, the didWriteDataWithTag method is not called. Can anyone explain this? Thanks! James

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• Question about mixing MEF and Unity

  - by Dave

  I'm finally diving into Unity head first, and have run into my first real problem. I've been gradually changing some things in my app from being MEF-resolved to Unity-resolved. Everything went fine on the application side, but then I realized that my plugins were not being loaded. I started to look into this issue, and I believe it's a case where MEF and Unity don't mix. Plugins are loaded by MEF, but each plugin needs to get access to the shared libraries in my application, like app preferences, logging, etc. Initially, my plugin constructor had the ImportingConstructor attribute. I then replaced it with InjectionConstructor so that Unity could resolve its shared library dependencies. But because I did that, MEF no longer loaded it! Then I used both attributes, which compiled, but then I got a composition error (MEF). I figured that this was because the constructor takes a parameter that was once resolved by a MEF Import, so I removed all parameters. As expected, now MEF was able to load my plugin, but because the constructor needs to call into the interface that was once passed in, construction fails. So now I'm at a point where I can get MEF to start to load my plugin, but can't do anything with it because the plugin relies on shared libraries that are registered with Unity. For those of you that have successfully mixed MEF and Unity, how do you go about resolving the references to the shared libraries with Unity? It seems like a catch-22, where in order to have Unity work with the plugin, I'd have to create the plugin via Resolve, but then it's impossible to use MEF. UPDATE I can work around this problem by using an ImportingConstructor for the plugin that takes an IUnityContainer, and then call Resolve for each interface that I need, but although it works, it is incredibly lame to do it this way, as this would require all plugin authors to remember to save a reference to the passed in IUnityContainer...

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• How to handle missing files on MVC

  - by kaivalya

  What is your preferred way to handle hits to files that does not exist on your MVC app. I have couple of web apps runing with MVC and they are constantly getting hits for files folders etc. that does not exist in the app structure. Apps are throwing exception: The controller for path could not be found or it does not implement IController I am trying to find out the best way to handle this. I have 3 global routes on my global.asax file (see below) and at this point I am happy with that simple definition. I know if I added route definition for all controllers then I can add a definition to ignore the rest and handle these hits but if it will be possible to solve this problem without it, I do not want to add route definitions for each controller which I believe will flood the route definitions and also add a layer of maintenance which I don't like. //Aggregates 2nd level routes.MapRoute( "AggregateLevel2", "{controller}/{action}/{id}/{childid}/{childidlevel2}", new { controller = "Home", action = "Index", id = "", childid = "", childidlevel2 = "" } ); //Aggregates 1st level routes.MapRoute( "AggregateLevel1", "{controller}/{action}/{id}/{childid}", new { controller = "Home", action = "Index", id = "", childid = "" } ); routes.MapRoute( "Default", "{controller}/{action}/{id}", new { controller = "Home", action = "Index", id = "" } );

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• WPF Spellcheck Engine takes up too much memory.

  - by Matt H.

  Each datatemplate in my WPF ItemsControl contains FIVE custom bindable richtextbox controls. It is a data-driven app that for authoring multiple-choice questions -- The question and four answer choices must all support: 1) Spell check 2) Rich formatting (otherwise I'd use regular textboxes) The spell check object in .NET 4 has a Friend constructor that takes a single argument of owner As TextBoxBase This means every richtextbox in the ItemsControl has 5 Spellcheck objects! This is the problem -- every spell check engine is consuming about 500k memory. So after you favor in the spellcheck, bindings, additional controls in the DataTemplate, etc.. a single multi choice question consumes more than 3MB memory. Users with 100--200 questions will quickly see the App raise it's memory consumption to 500+ MB. Management is definitely not OK with this. Is there a way to minimimze this problem? The best suggestion I've heard is to enable/disable spellcheck if the richtextbox is in the ItemsControl's scrollviewer: I haven't gotten an answer to how to go about it: (http://stackoverflow.com/questions/2869012/possible-to-implement-an-isviewportvisible-dependencyproperty-for-an-item-in-an-i) Any good ideas?

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• General N-Tier Architecture Question

  - by whatispunk

  In an N-Tier app you're supposed to have a business logic layer and a data access layer. Is it bad to simply have two assemblies: BusinessLogicLayer.dll and DataAccessLayer.dll to handle all this logic? How do you actually represent these layers. It seems silly, the way I've seen it, to have a BusinessLogic class library containing classes like: CustomerBusinessLogic.cs, OrderBusinessLogic.cs, etc. each calling their appropriately named cousin in the DataAccessLayer class library, i.e. CustomerDataAccess.cs, OrderDataAccess.cs. I want to create a web app using MVP and it doesn't seem so cut and dry as this. There are lots of opinions about where the business logic is supposed to be put in MVP and I'm not sure I've found a really great answer yet. I want this project to be easily testable, and I am trying to adhere to TDD methodologies as best I can. I intend to use MSTest and Rhino Mocks for testing. I was thinking of something like the following for my architecture: I'd use LINQ-To-SQL to talk to the database. WCF services to define data contract interfaces for the business logic layer. Then use MVP with ASP.NET Forms for the UI/BLL. Now, this isn't the start of this project, most of the LINQ stuff is already done, so its stuck. The WCF service would replace the existing DataAccessLayer assembly and the UI/BLL would replace the BusinessLogicLayer assembly etc. This sort of makes sense in my head, but its getting really late. Anyone that's traveled down this path have any guidance? Good links? Warnings? Thanks!

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• Problem with NSUserDefaults and deallocated Instance

  - by Peter A

  Hi, I'm having a problem with NSUserDefaults. I've followed the steps in the books as closely as I can for my app, but still get the same problem. I am getting a *** -[NSUserDefaults integerForKey:]: message sent to deallocated instance 0x3b375a0 error when I try and load in the settings. Here is the code that I have, it is in the App Delegate class. - (void)applicationDidFinishLaunching:(UIApplication *)application { recordingController = [[RecordingTableViewController alloc] initWithStyle:UITableViewStylePlain]; [recordingController retain]; // Add the tab bar controller's current view as a subview of the window [window addSubview:tabBarController.view]; [self loadSettings]; } -(void)loadSettings { NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults]; NSNumber loop = [defaults objectForKey:@"loop_preference"]; NSNumber play = [defaults objectForKey:@"play_me_preference"]; NSNumber volume = [defaults objectForKey:@"volume_preference"]; } As you can see I am not trying to do anything with the values yet, but I get the error on the line reading in the loop preference. I also get it if I try and read an NSString. Any suggestions would be greatly appreciated. Thanks Peter

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• IIS 6 forces AppRoot/Starting Point to upper case when Virtual Directory is imported from a file

  - by user276464

  I have searched the web for this and couldn't find anything (well one remotely relevant post), so here I am. We have multiple ASP.NET apps in IIS 6 using Forms Authentication with dedicated path for each app. Since path is case sensitive it must match URL's path section exactly. However, because of an incorrect casing in IIS 6 Metabase for AppRoot (or Starting Point in IIS UI) bowser doesn't send Form cookie to the server whenever URL is previously resolved on the server and sent to client in incorrect case. Example: App URL = "https://Test.net/Application1" Cookie path = /Application1 Metabase AppRoot = /LM/W3SVC/1393818691/ROOT/APPLICATIONPATH1 Resolved URL = "https://Test.net/APPLICATIONPATH1" Now to the root cause... We create virtual directories on test server manually in a specific case (matches Path for each application). We then export virtual directory using UI to an XML file, which is then imported to another server (let's say production), at which point IIS decides to uppercase AppRoot element of the metabase. Can anyone shed some light on this? Is there a setting on IIS I am not aware of? I am trying to avoid manual edit of metabase after the import. Is that a bug?

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• Starting one BlackBerry screen from another.

  - by DanG

  I've recently run into a snag while putting on the finishing touches for my BlackBerry app. I'm building a login screen which, if the user is successful in logging in, goes to a data loading screen, and then to a home screen. From the home screen, you can use the app. Everything works great but one thing, I can't seamlessly move from the login screen to the loading screen, to the home screen. I can move from the login screen to the loading screen ok, because I'm doing that via a button click which is on the GUI thread, but then I have the login screen at the bottom of the stack and can't get it out using the dismiss method. Once in the loading screen, I can't push the home screen because I'm not doing it via the gui method, though I'm able to update the GUI via the following piece of code: private void checkData(){ Timer loadingTimer = new Timer(); TimerTask loadingTask = new TimerTask() { public void run() { // set the progress bar progressGaugeField.setValue(DataManager.getDataLoaded()); // for repainting the screen invalidate(); } }; loadingTimer.scheduleAtFixedRate(loadingTask, 500, 500); } Does anyone know how to solve my problem of moving seamlessly from the login screen to the loading screen to the home screen? Note: once I'm at the home screen I'd like to have it be the only screen on the stack. Thanks!

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• Connecting to a network drive programmatically and caching credentials

  - by Chris Doggett

  I'm finally set up to be able to work from home via VPN (using Shrew as a client), and I only have one annoyance. We use some batch files to upload config files to a network drive. Works fine from work, and from my team lead's laptop, but both of those machines are on the domain. My home system is not, and won't be, so when I run the batch file, I get a ton of "invalid drive" errors because I'm not a domain user. The solution I've found so far is to make a batch file with the following: explorer \\MACHINE1 explorer \\MACHINE2 explorer \\MACHINE3 Then manually login to each machine using my domain credentials as they pop up. Unfortunately, there are around 10 machines I may need to use, and it's a pain to keep entering the password if I missed one that a batch file requires. I'm looking into using the answer to this question to make a little C# app that'll take the login info once and login programmatically. Will the authentication be shared automatically with Explorer, or is there anything special I need to do? If it does work, how long are the credentials cached? Is there an app that does something like this automatically? Unfortunately, domain authentication via the VPN isn't an option, according to our admin. EDIT: If there's a way to pass login info to Explorer via the command line, that would be even easier using Ruby and highline.

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• manage.py runserver throws an ImportError with my appname, MacPorts issue on OSX?

  - by christmasgorilla

  I've been developing a Django app for weeks locally on OSX 10.6.3. Recently, I rebooted my machine and went to start my development environment up. Here's the error: cm:myApp cm$ python manage.py runserver Traceback (most recent call last): File "manage.py", line 11, in execute_manager(settings) File "/Library/Python/2.6/site-packages/django/core/management/init.py", line 360, in execute_manager setup_environ(settings_mod) File "/Library/Python/2.6/site-packages/django/core/management/init.py", line 343, in setup_environ project_module = import_module(project_name) File "/Library/Python/2.6/site-packages/django/utils/importlib.py", line 35, in import_module import(name) ImportError: No module named myapp I'm pretty new to Django / Python. Digging around, it's possible that this might be due to MacPorts. Initially, I had a rough time getting Django up and running and I no longer remember if I'm using the Django from a MacPorts install or from easy_install. How do I tell? (I'd prefer not to reinstall everything). Also, why is the camel casing in my app name gone in the ImportError message? When I search for "myapp" in my django project, I don't find it without camelcase anywhere. And what causes MacPorts to work for a while but then break? As a few other details, from settings.py: INSTALLED_APPS = ( 'django.contrib.auth', 'django.contrib.contenttypes', 'django.contrib.sessions', 'django.contrib.sites', 'django.contrib.admin', 'south', 'registration', 'pypaypal', 'notifier', 'myApp.batches', )

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• Send post request from client to node.js

  - by Husar

  In order to learn node.js I have built a very simple guestbook app. There is basically just a comment form and a list of previous comments. Currently the app is client side only and the items are stored within local storage. What I want to do is send the items to node where I will save them using Mongo DB. The problem is I have not yet found a way to establish a connection to send data back and forth the client and node.js using POST requests. What I do now is add listeners to the request and wait for data I send: request.addListener('data', function(chunk) { console.log("Received POST data chunk '"+ chunk + "'."); }); On the client side I send the data using a simple AJAX request: $.ajax({ url: '/', type: 'post', dataType: 'json', data: 'test' }) This does not work at all in them moment. It could be that I don't know what url to place in the AJAX request 'url' parameter. Or the whole thing might just be the build using the wrong approach. I have also tried implementing the method described here, but also with no success. It would really help if anyone can share some tips on how to make this work (sending POST request from the client side to node and back) or share any good tutorials. thanks.

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• Android - Widget to Play Video (onclick trouble)

  - by Josh

  I am trying to make a simple widget that will play a movie from the sdcard when clicked on. This seems simple enough, and by following tutorials I've come up with the following code, but it seems the onclick is never setup. Manifest: <receiver android:name="WidgetProvider" android:label="DVD Cover"> <intent-filter> <action android:name="android.appwidget.action.APPWIDGET_UPDATE"/> </intent-filter> <meta-data android:name="android.appwidget.provider" android:resource="@xml/appwidget_info_2x4"/> </receiver> Layout (widget.xml): <?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:id="@+id/holder" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent" android:background="#ff777777" > <ImageView android:id="@+id/cover" android:layout_width="wrap_content" android:layout_height="fill_parent" android:textColor="#000000" /> </LinearLayout> appwidget.xml: <?xml version="1.0" encoding="utf-8"?> <appwidget-provider xmlns:android="http://schemas.android.com/apk/res/android" android:minWidth="200dip" android:minHeight="300dip" android:updatePeriodMillis="180000" android:initialLayout="@layout/widget" > </appwidget-provider> WidgetProvider.java: public class WidgetProvider extends AppWidgetProvider { public void onUpdate(Context context, AppWidgetManager appWidgetManager, int[] appWidgetIds) { String movieurl = Environment.getExternalStorageDirectory().getPath() + "/Movie.mp4"; Intent notificationIntent = new Intent(Intent.ACTION_VIEW); notificationIntent.setDataAndType(Uri.parse(movieurl), "video/*"); PendingIntent contentIntent = PendingIntent.getActivity(context, 0, notificationIntent,0); // Get the layout for the App Widget and attach an on-click listener // to the button RemoteViews views = new RemoteViews(context.getPackageName(), R.layout.widget); views.setOnClickPendingIntent(R.id.holder, contentIntent); // Tell the AppWidgetManager to perform an update on the current app widget appWidgetManager.updateAppWidget(appWidgetIds, views); } } Any help would be greatly appreciated. Thanks, Josh

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• WPF Browser is there, but invisible.

  - by Adam Crossland

  I am attempting to use the Browser control in a very simple WPF application, and it appears that while the browser is loading the page that I requested (I can mouseover images and see the ALT tags), I can't actually see anything else: Here is the XAML for the app: <Window x:Class="SmokeyBox2.MainWindow" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" Title="SmokeyBox" Height="120" Width="510" ShowInTaskbar="False" SizeToContent="WidthAndHeight" WindowStyle="None" AllowsTransparency="True" MouseLeftButtonDown="Window_MouseLeftButtonDown"> <Border Background="#50FFFFFF" CornerRadius="5" BorderThickness="2,0,2,2" Padding="5 1 5 5"> <Grid> <Grid.RowDefinitions> <RowDefinition Height="Auto"></RowDefinition> <RowDefinition Height="Auto"></RowDefinition> <RowDefinition Height="Auto"></RowDefinition> </Grid.RowDefinitions> <Grid.ColumnDefinitions> <ColumnDefinition Width="Auto"></ColumnDefinition> <ColumnDefinition Width="Auto"></ColumnDefinition> </Grid.ColumnDefinitions> <Label Grid.Row="0" Grid.Column="0" Background="Transparent" Content="SmokeyBox" MouseLeftButtonDown="Label_MouseLeftButtonDown" /> <TextBox Grid.Row="1" Grid.Column="0" Name="searchText" Width="450" FontFamily="Arial" Foreground="DarkGray" Background="Transparent" FontSize="20" MouseLeftButtonDown="searchText_MouseLeftButtonDown" BorderBrush="Transparent" /> <Expander Grid.Row="1" Grid.Column="1" Padding="2 3 0 0 " Expanded="Expander_Expanded" Collapsed="Expander_Collapsed" /> <WebBrowser Grid.Row="2" Grid.Column="0" x:Name="browser" Visibility="Visible" Width="480" Height="480" Margin="2 2 2 2" ></WebBrowser> </Grid> </Border> </Window> So can anyone help me figure out why the browser isn't showing the Yahoo! home page like I asked it to? And while I am at it, I'm going to own up to the fact that this is my first WPF app, and I'd love to hear any general pointers on how to get rid of general noobie badness in my XAML. Thanks.

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• Query optimization (OR based)

  - by john194

  I have googled but I can't find answers for these questions. Your advice is appreciated. centOS on vps with 512MB RAM, nginx, php5 (fastcgi), mysql5 (myisam, not innodb). I need to optimize this app created by some ex-employee. This app is working, but it's slow. Table: t1(id[bigint(20)],c1[mediumtext],c2[mediumtext],c3[mediumtext],c4[mediumtext]) id is some random big number, and is PK Those mediumtext rows look like this: c1="|box-002877|" c2="|ct-2348|rd-11124854|hw-3949|wd-8872|hw-119037736|...etc.. " c3="|fg-2448|wd-11172|hw-1656|...etc.. " c4="|hg-2448|qd-16667|...etc." (some columns contain a lot of data, around 900 KiB, database around 300 MiB) Yes, mediumtext "is bad", and (20) is too big... but I didn't create this. Those codes can be found on any of those 4 mediumtext's... //he needs all the columns of the row containing $code, so he wrote this: function f1($code) { SELECT * FROM t1 WHERE c1 LIKE '%$code%' OR c2 LIKE '%$code%' OR c3 LIKE '%$code%' OR c4 LIKE '%$code%'; Questions: Q1. If $code is found on c1... mysql automatically stops checking and returns row=id+c1+c2+c3+c4? or it will continue (wasting time) checking c2, c3 and c4?... Q2. Mysql is working with this table on disk (not RAM) because of the mediumtext, right? is this the primary cause of slowness? Q3. That query can be cached by mysql (if using a big query_cache_size=128M value on the my.cnf)? or that's not cacheable due to the mediumtexts, or due to the "OR LIKE"...? Q4. Do you recommend rewriting this with mysql's INSTR() / LOCATE() / MATCH..AGAINST [FULLTEXT]?

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• Java Collections and Garbage Collector

  - by Anth0

  A little question regarding performance in a Java web app. Let's assume I have a List<Rubrique> listRubriques with ten Rubrique objects. A Rubrique contains one list of products (List<product> listProducts) and one list of clients (List<Client> listClients). What exactly happens in memory if I do this: listRubriques.clear(); listRubriques = null; My point of view would be that, since listRubriques is empty, all my objects previously referenced by this list (including listProducts and listClients) will be garbage collected pretty soon. But since Collection in Java are a little bit tricky and since I have quite performance issues with my app i'm asking the question :) edit : let's assume now that my Client object contains a List<Client>. Therefore, I have kind of a circular reference between my objects. What would happen then if my listRubrique is set to null? This time, my point of view would be that my Client objects will become "unreachable" and might create a memory leak?

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• Software Update Notifications

  - by devio

  I am considering implementing some sort of Software Update Notification for one of the web applications I am developing. There are several questions I came across: Should the update check be executed on the client or on the server? Client-side means, the software retrieves the most current version information, performs its checks, and displays the update information. Server-side check means the software sends its version info to the server, which in turn does the calculations and returns information to the client. My guess is that server-side implementation may turn out to be more flexible and more powerful than client-side, as I can add functionality to the server easily, as long as the client understands it. Where should the update info be displayed? Is it ok to display on the login screen? Should only admins see it? (this is a web app with a database, so updating requires manipulation of db and web, which is only done by admins). What about a little beeping flashing icon which increases in size as the version gets more obsolete every day ;) ? Privacy issues Not everybody likes to have their app usage stats broadcast over the internet. TheOnion question: What do you think?

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• Android AppWidget maps activity problem

  - by Andy Armstrong

  Right. So I have an app widget. It has 4 buttons, one one of the buttons I want it to show me the current location of the user on the map. So - I make a new activity as below: package com.android.driverwidget; import java.util.List; import android.os.Bundle; import com.google.android.maps.MapActivity; import com.google.android.maps.MapController; import com.google.android.maps.MapView; import com.google.android.maps.MyLocationOverlay; import com.google.android.maps.Overlay; public class MyLocation extends MapActivity{ public void onCreate(Bundle icicle) { super.onCreate(icicle); setContentView(R.layout.main); MapView myMapView = (MapView)findViewById(R.id.mapview); MapController mapController = myMapView.getController(); List<Overlay> overlays = myMapView.getOverlays(); MyLocationOverlay myLocationOverlay = new MyLocationOverlay(this, myMapView); overlays.add(myLocationOverlay); myLocationOverlay.enableMyLocation(); } protected boolean isRouteDisplayed() { return false; } } And then I added the appropriate uses library line to the manifest <activity android:name=".MyLocation" android:label="myLocation"> </activity> <uses-library android:name="com.google.android.maps" /> Ok yet - when I run the app the following errors occur, looks like it cannot find the MapActivity class, im running it on the GoogleApps 1.5 instead of normal android 1.5 as well. http://pastebin.com/m3ee8dba2 Somebody plz help me - i am now dying.

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