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  • UIImage Shadow Trouble

    - by Brandon Schlenker
    I'm trying to add a small shadow to an image, much like the icon shadows in the App Store. Right now I'm using the following code to round the corners of my images. Does anyone know how I can adapt it to add a small shadow? - (UIImage *)roundCornersOfImage:(UIImage *)source height:(int)height width:(int)width { int w = width; int h = height; CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB(); CGContextRef imageContext = CGBitmapContextCreate(NULL, w, h, 8, 4 * w, colorSpace, kCGImageAlphaPremultipliedFirst); CGContextBeginPath(imageContext); CGRect rect = CGRectMake(0, 0, w, h); addRoundedRectToPath(imageContext, rect, 10, 10); CGContextClosePath(imageContext); CGContextClip(imageContext); CGContextDrawImage(imageContext, CGRectMake(0, 0, w, h), source.CGImage); CGImageRef imageMasked = CGBitmapContextCreateImage(imageContext); CGContextRelease(imageContext); CGColorSpaceRelease(colorSpace); return [UIImage imageWithCGImage:imageMasked]; } "addRoundedRectToPath" refers to another method that obviously rounds the corners.

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  • How can I transform XML to invalid XML using XSLT?

    - by Damovisa
    I need to transform a valid XML document to the OFX v1.0.2 format. This format is more or less XML, but it's technically invalid and therefore cannot be parsed as XML. I'm having trouble getting my Xml transformation working because the .Net XslCompiledTransform object insists on interpreting the XSL as an XML document (which is fair enough). If I escape the xml-ish tags using &lt; and &gt, they get removed when I download the file. Here's the start of my XSLT: <xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform" version="1.0"> <xsl:output method="text"></xsl:output> <xsl:param name="currentdate"></xsl:param> <xsl:template match="Transactions"> OFXHEADER:100 DATA:OFXSGML VERSION:102 SECURITY:NONE ENCODING:USASCII CHARSET:1252 COMPRESSION:NONE OLDFILEUID:NONE NEWFILEUID:NONE <OFX> <SIGNONMSGSRSV1> <SONRS> <STATUS> <CODE>0 <SEVERITY>INFO </STATUS> <DTSERVER><xsl:value-of select="$currentdate" /> <LANGUAGE>ENG Any suggestions?

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  • how to store JSON into POJO using Jackson

    - by user2963680
    I am developing a module where i am using rest service to get data. i am not getting how to store JSON using Jackson and store it which has Queryparam also. Any help is really appreciated as I am new to this.I am trying to do server side filtering in extjs infinte grid which is sending the below request to rest service. when the page load first time, it sends http://myhost/mycontext/rest/populateGrid?_dc=9999999999999&page=1&start=0&limit=500 when you select filter on name and place, it sends http://myhost/mycontext/rest/populateGrid?_dc=9999999999999&filter=[{"type":"string","value":"Tom","field":"name"},{"type":"string","value":"London","field":"Location"}]&page=1&start=0&limit=500 I am trying to save this in POJO and then sending this to database to retrieve data. For this on rest side i have written something like this @Provider @Path("/rest") public interface restAccessPoint { @GET @Path("/populateGrid") @Produces({MediaType.APPLICATION_JSON}) public Response getallGridData(FilterJsonToJava filterparam,@QueryParam("page") String page,@QueryParam("start") String start,@QueryParam("limit") String limit); } public class FilterJsonToJava { @JsonProperty(value ="filter") private List<Filter> data; .. getter and setter below } public class Filter { @JsonProperty("type") private String type; @JsonProperty("value") private String value; @JsonProperty("field") private String field; ...getter and setters below } I am getting the below error The following warnings have been detected with resource and/or provider classes: WARNING: A HTTP GET method, public abstract javax.ws.rs.core.Response com.xx.xx.xx.xxxxx (com.xx.xx.xx.xx.json.FilterJsonToJava ,java.lang.String,java.lang.String,java.lang.String), should not consume any entity. com.xx.xx.xx.xx.json.FilterJsonToJava, and Java type class com.xx.xx.xx.FilterJsonToJava, and MIME media type application/octet-stream was not found [11/6/13 17:46:54:065] 0000001c ContainerRequ E The registered message body readers compatible with the MIME media type are: application/octet-stream com.sun.jersey.core.impl.provider.entity.ByteArrayProvider com.sun.jersey.core.impl.provider.entity.FileProvider com.sun.jersey.core.impl.provider.entity.InputStreamProvider com.sun.jersey.core.impl.provider.entity.DataSourceProvider com.sun.jersey.core.impl.provider.entity.RenderedImageProvider */* -> com.sun.jersey.core.impl.provider.entity.FormProvider ...

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  • What does this code from AuthKit do? (where are these functions and methods defined?)

    - by Beau Simensen
    I am trying to implement my own authentication method for AuthKit and am trying to figure out how some of the built-in methods work. In particular, I'm trying to figure out how to update the REMOTE_USER for environ correctly. This is how it is handled inside of authkit.authenticate.basic but it is pretty confusing. I cannot find anyplace where REMOTE_USER and AUTH_TYPE are defined. Is there something strange going on here and if so, what is it? def __call__(self, environ, start_response): environ['authkit.users'] = self.users result = self.authenticate(environ) if isinstance(result, str): AUTH_TYPE.update(environ, 'basic') REMOTE_USER.update(environ, result) return self.application(environ, start_response) There are actually a number of all uppercase things like this that I cannot find a definition for. For example, where does AUTHORIZATION come from below: def authenticate(self, environ): authorization = AUTHORIZATION(environ) if not authorization: return self.build_authentication() (authmeth, auth) = authorization.split(' ',1) if 'basic' != authmeth.lower(): return self.build_authentication() auth = auth.strip().decode('base64') username, password = auth.split(':',1) if self.authfunc(environ, username, password): return username return self.build_authentication() I feel like maybe I am missing some special syntax handling for the environ dict, but it is possible that there is something else really weird going on here that isn't immediately obvious to someone as new to Python as myself.

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  • Objective-C memory model

    - by TofuBeer
    I am attempting to wrap my head around one part of the Objective-C memory model (specifically on the iPhone, so no GC). My background is C/C++/Java, and I am having an issue with the following bit of code (also wondering if I am doing this in an "Objective-C way" or not): - (NSSet *) retrieve { NSMutableSet *set; set = [NSMutableSet new]; // would normally fill the set in here with some data return ([set autorelease]); } - (void) test { NSSet *setA; NSSet *setB; setA = [self retrieve]; setB = [[self retrieve] retain]; [setA release]; [setB release]; } start EDIT Based on comments below, the updated retrieve method: - (NSSet *) retrieve { NSMutableSet *set; set = [[[NSMutableSet alloc] initWithCapacity:100] autorelease]; // would normally fill the set in here with some data return (set); } end EDIT The above code gives a warning for [setA release] "Incorrect decrement of the reference count of an object is not owned at this point by the caller". I though that the "new" set the reference count to 1. Then the "retain" call would add 1, and the "release" call would drop it by 1. Given that wouldn't setA have a reference count of 0 at the end and setB have a reference count of 1 at the end? From what I have figured out by trial and error, setB is correct, and there is no memory leak, but I'd like to understand why that is the case (what is wrong with my understanding of "new", "autorelease", "retain", and "release").

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  • has_many, belongs_to and comment forms

    - by Koning Baard XIV
    I'm having two models: Snippet and SnippetComment. These also have their own controllers, as well as views. In /app/views/snippets/show.html.erb I have a form that starts like this: <% form_for(@new_snippet_comment) do |form| %> SnippetComment belongs to one Snippet, and a Snippet belongs to one User. This means that I have this routing: map.resources :users do |user| user.resources :snippets do |snippet| snippet.resources :snippet_comments, :as => "comments" end end So when I submit the SnippetComment form in the SnippetController#show view, this request should be made: POST /users/x/snippets/x/comments HTTP/1.1 (where x is the User's or Snippet's id). The problem is that I don't even get the comment submission form, but rahter this: NoMethodError in Snippets#show Showing app/views/snippets/show.html.erb where line #29 raised: undefined method `snippet_comments_path' for Extracted source (around line #29): 26: <% if current_user %> 27: <h2>Schrijf een nieuwe reactie</h2> 28: 29: <% form_for(@new_snippet_comment) do |form| %> 30: 31: <p> 32: <%= form.text_area :body %> RAILS_ROOT: /Users/jeffatwood/Dev/youjustdontneedmyrealname Application Trace | Framework Trace | Full Trace /Users/jeffatwood/.gem/ruby/1.8/gems/actionpack-2.3.5/lib/action_controller/polymorphic_routes.rb:107:in `__send__' /Users/jeffatwood/.gem/ruby/1.8/gems/actionpack-2.3.5/lib/action_controller/polymorphic_routes.rb:107:in `polymorphic_url' /Users/jeffatwood/.gem/ruby/1.8/gems/actionpack-2.3.5/lib/action_controller/polymorphic_routes.rb:114:in `polymorphic_path' /Users/jeffatwood/.gem/ruby/1.8/gems/actionpack-2.3.5/lib/action_view/helpers/form_helper.rb:298:in `apply_form_for_options!' /Users/jeffatwood/.gem/ruby/1.8/gems/actionpack-2.3.5/lib/action_view/helpers/form_helper.rb:277:in `form_for' /Users/jeffatwood/Dev/youjustdontneedmyrealname/app/views/snippets/show.html.erb:29:in `_run_erb_app47views47snippets47show46html46erb' /Users/jeffatwood/Dev/youjustdontneedmyrealname/app/controllers/snippets_controller.rb:19:in `show' Request Parameters: {"id"=>"1", "user_id"=>"2"} Show session dump Response Headers: {"Content-Type"=>"text/html", "Cache-Control"=>"no-cache"} Can anyone help me with this problem? Thanks

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  • How to handle ASP.NET application error that occurs on application start and transfer & display erro

    - by Soul_Master
    I know that ASP.NET MVC has error filter attribute to handle specified error type. However, this feature cannot catch any error that occurs when application start. Therefore, I need to add some code to “Application_Error” method for handling this error like the following code. public void Application_Error(object sender, EventArgs e) { // At this point we have information about the error var ctx = HttpContext.Current; var exception = ctx.Server.GetLastError(); var errorInfo = "<br>Offending URL: " + ctx.Request.Url + "<br>Source: " + exception.Source + "<br>Message: " + exception.Message + "<br>Stack trace: " + exception.StackTrace; ctx.Response.Write(errorInfo); Server.ClearError(); } Although, this code will works fine, when normal application error occurs like error that occurs in view page. Nevertheless, it does not work when error occurs on application starting because request and response objects are always null. Next, I try to solve this question by setting default redirect in custom errors like the following code. <customErrors mode="On" defaultRedirect="Scripts/ApplicationError.htm"></customErrors> Unfortunately, it does not work because when application receive redirected request, it try to start application again and it throw exception again. How do to solve this problem? Alternatively, Do you have other idea for handling this error. Thanks, PS. The main reason for creating this handler because I want to display error when application cannot connect to other service like database for caching data on application start.

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  • how to use anonymous generic delegate in C# 2.0

    - by matti
    Hi. I have a class called NTree: class NTree<T> { public NTree(T data) { this.data = data; children = new List<NTree<T>>(); _stopTraverse = false; } ... public void Traverse(NTree<T> node, TreeVisitor<T> visitor) { try { _stopTraverse = false; Traverse(node, visitor); } finally { _stopTraverse = false; } } private void TraverseInternal(NTree<T> node, TreeVisitor<T> visitor) { if (_stopTraverse) return; if (!visitor(node.data)) { _stopTraverse = true; } foreach (NTree<T> kid in node.children) Traverse(kid, visitor); } When I try to use Traverse with anonymous delegate I get: Argument '2': cannot convert from 'anonymous method' to 'NisConverter.TreeVisitor' The code: tTable srcTable = new tTable(); DataRow[] rows; rootTree.Traverse(rootTree, delegate(TableRows tr) { if (tr.TableName == srcTable.mappingname) { rows = tr.Rows; return false; } }); This however produces no errors: static bool TableFinder<TableRows>(TableRows tr) { return true; } ... rootTree.Traverse(rootTree, TableFinder); I have tried to put "arrowhead-parenthisis" and everything to anonymous delegate but it just does not work. Please help me! Thanks & BR -Matti

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  • AVAudioRecorder Won't Record On Device

    - by Dyldo42
    This is my method: -(void) playOrRecord:(UIButton *)sender { if (playBool == YES) { NSError *error = nil; NSString *filePath = [[NSBundle mainBundle] pathForResource:[NSString stringWithFormat: @"%d", [sender tag]] ofType:@"caf"]; NSURL *fileUrl = [NSURL fileURLWithPath:filePath]; AVAudioPlayer *player = [[AVAudioPlayer alloc] initWithContentsOfURL:fileUrl error:&error]; [player setNumberOfLoops:0]; [player play]; } else if (playBool == NO) { if ([recorder isRecording]) { [recorder stop]; [nowRecording setImage:[UIImage imageNamed:@"NormalNormal.png"] forState:UIControlStateNormal]; [nowRecording setImage:[UIImage imageNamed:@"NormalSelected.png"] forState:UIControlStateSelected]; } if (nowRecording == sender) { nowRecording = nil; return; } nowRecording = sender; NSError *error = nil; NSString *filePath = [[NSBundle mainBundle] pathForResource:[NSString stringWithFormat: @"%d", [sender tag]] ofType:@"caf"]; NSURL *fileUrl = [NSURL fileURLWithPath:filePath]; [sender setImage:[UIImage imageNamed:@"RecordingNormal.png"] forState:UIControlStateNormal]; [sender setImage:[UIImage imageNamed:@"RecordingSelected.png"] forState:UIControlStateSelected]; recorder = [[AVAudioRecorder alloc] initWithURL:fileUrl settings:recordSettings error:&error]; [recorder record]; } } Most of it is self explanatory; playBool is a BOOL that is YES when it is in play mode. Everything works in the simulator however, when I run it on a device, [recorder record] returns NO. Does anyone have a clue as to why this is happening?

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  • Set Recurring payment with different initial payment in Paypal

    - by www.sapnaedu.in
    I am developing a payment option in a PHP based application. The user can choose Paypal or Paypal recurring method to make a payment. However, the user would pay $50 for the first time and $40 starting from next month. However, when the user chooses the Paypal recurring option and he pays $50, Paypal automatically chooses $50 from the next month onwards. Is it possible to set the different initial payment and recurring payment ? Here is the part of the code : echo "<input type=\"hidden\" name=\"no_shipping\" value=\"1\"/>\n"; echo "<input type=\"hidden\" name=\"a3\" value=\"".$amt."\"/>\n"; echo "<input type=\"hidden\" name=\"p3\" value=\"1\"/>\n"; echo "<input type=\"hidden\" name=\"t3\" value=\"M\"/>\n"; echo "<input type=\"hidden\" name=\"src\" value=\"1\"/>\n"; echo "<input type=\"hidden\" name=\"sra\" value=\"1\"/>\n"; echo "<input type=\"hidden\" name=\"no_note\" value=\"1\"/>\n"; Thanks Kiran

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  • Debugging a release only flash problem

    - by Fire Lancer
    I've got an Adobe Flash 10 program that freezes in certain cases, however only when running under a release version of the flash player. With the debug version, the application works fine. What are the best approaches to debugging such issues? I considered installing the release player on my computer and trying to set some kind of non-graphical method of output up (I guess there's some way to write a log file or similar?), however I see no way to have both the release and debug versions installed anyway :( . EDIT: Ok I managed to replace my version of flash player with the release version, and no freeze...so what I know so far is: Flash: Debug Release Vista 32: works works XP PRO 32: works* freeze I gave them the debug players I had to test this Hmm, seeming less and less like an error in my code and more like a bug in the player (10.0.45.2 in all cases)... At the very least id like to see the callstack at the point it freezes. Is there some way to do that without requiring them to install various bits and pieces, e.g. by letting flash write out a log.txt or something with a "trace" like function I can insert in the code in question? EDIT2: I just gave the swf to another person with XP 32bit, same results :(

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  • Java/BlackBerry build error overriding too many classes

    - by behrk2
    Hey everyone, Has anyone ever heard of overriding too many classes in Java? Perhaps this issue is just related to BlackBerry development, but I was wondering if it is an issue in Java, too. Let's say I have the following: LabelField lblTitle = new LabelField(title) { protected void paint(Graphics graphics) { graphics.setColor(0x00FFFFFF); graphics.clear(); super.paint(graphics); } }; LabelField lblSubTitle = new LabelField(releaseYear + ", " + rating) { protected void paint(Graphics graphics) { graphics.setColor(0x00FFFFFF); graphics.clear(); super.paint(graphics); } }; This code works. However, I've noticed that by overriding the paint() method multiple times in many different classes throughout my project, I receive the error: I/O Error: Cannot run program "jar": CreateProcess error=2, The system cannot find the file specified My only solution thus far is to clean up my GUI code...minimize it and reuse it. Perhaps its good that this happened so I can be less careless about creating GUI code all over my classes. Anyways, I was just wondering if anyone has heard of this before. If you are interested in reading more about the issue I have been facing, check out the following link: BlackBerry Java Development Forums

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  • create app that has plugin which contains PyQt widget

    - by brian
    I'm writing an application that will use plugins. In the plugin I want to include a widget that allows the options for that plugin to be setup. The plugin will also include methods to operate on the data. What is is the best way to include a widget in a plugin? Below is pseudo code for what I've tried to do. My original plan was to make the options widget: class myOptionsWidget(QWidget): “”” create widget for plug in options “”” …. Next I planned on including the widget in my plugin: class myPlugin def __init__(self): self.optionWidget = myOptionsWidget() self.pluginNum = 1 …. def getOptionWidget(self): return(self.optionWidget) Then at the top level I'd do something like a = myPlugin() form = createForm(option=a.getOptionWidget()) … where createForm would create the form and include my plugin options widget. But when I try "a = myPlugin()" I get the error "QWidget: Must construct a QApplication before a QpaintDevice" so this method won't work. I know I would store the widget as a string and call eval on it but I'd rather not do that in case later on I want to convert the program to C++. What is the best way to write a plugin that includes a widget that has the options? Brian

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  • XML String into a DataGridView (C#)

    - by Justin Daniels
    I am currently working with a webservice to pull a report about users in a remote support system. After pulling my report and receiving the result, I am given the following string back by the method: <report><header><field id="0">Source</field><field id="1">Session ID</field><field id="2">Date</field><field id="3">Name</field><field id="24">Technician Name</field><field id="25">Technician ID</field></header><data><row><field id="0">Email</field><field id="1">55037806</field><field id="2">4/13/2010 2:28:06 AM</field><field id="3">Bill Gates</field><field id="24">John</field><field id="25">1821852</field></row><row><field id="0">Telephone</field><field id="1">55034548</field><field id="2">4/13/2010 12:59:44 AM</field><field id="3">Steve Jobs</field><field id="24">John</field><field id="25">1821852</field></row></data></report> After receiving this string, I need to take it and display the actual data in a datagridview. I've tried putting it into an XMLDocument then reading that, but it seems to keep failing. Just interested in another set of eyes :) Application is written in C# in VS2010.

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  • How to upload a file with watir and IE?

    - by karlthorwald
    I am writing a watir script to test an upload form. But the script does not automatically choose the file that is to be uploaded from my harddrive. Instead IE stops with the file chooser dialog open. As soon as I manually select the to be uploaded file in the dialog and click ok, watir continues as desired. I wonder why it stops. This is from my watir script: ie.file_field(:name, 'upload').set("s:\\localwatir\\Test_Pdf.pdf") ie.button(:name, 'submit').click I got the code from this page: http://wiki.openqa.org/display/WTR/File+Uploads This is the form: <form name="form1" enctype="multipart/form-data" method="post" action="uploadlegacy.php"> <input type="file" name="upload" size="30"> <input type="submit" name="submit" value="upload"> </form> I have found this manual http://svn.openqa.org/svn/watir/trunk/watir/unittests/filefield_test.rb also, but as I do not know what $htmlRoot stands for, I cannot really follow it. Does that mean, I have to put some "file///" into the parameter for set()? If so, how exactly? I am using IE 6 for the testing.

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  • Help with editing data in entity framework.

    - by Levelbit
    Title of this question is simple because there is no an easy explanation for what I'm trying to ask you. I hope you'll understand in the end :). I have to tables in my database: Company and Location (relationship:one to many) and corresponding entity sets. In my wpf application I have some datagrid which I want to fill with locations and to be able to edit every row in separate window as some form of details view (so I don't want to edit my data in datagrid). I did this by accessing Location entity from selected row and creating a new Location entity and then I copy properties from original entity to newly created. Something like cloning the object. After editing if I press OK changed data is copied to original object back, and if I press Cancel nothing happens. Of course, you probably thinking I could use NoTracking option and AttachAsModified method as was mentioned as solution in some earlier questions(see:http://stackoverflow.com/questions/803022/changing-entities-in-the-entityframework) by Alex James, but lets say I had some problems about that and I have my own reasons for doing this. Finally, because navigation property(Company) of my location entity is assigned to newly created location object(during cloning) from some reason in object context additional object as copy of object I want to edit from datagrid is created without my will(similar problem :http://blogs.msdn.com/alexj/archive/2009/12/02/tip-47-how-fix-up-can-make-it-hard-to-change-relationships.aspx). So, when I do ObjectContext.SaveChanges it inserts additional row of data into my database table Location, the same as the one i wanted to edit. I read about sth like this, but I don't quite understand why is that and how to block or override this. I hope I was clear as I could. Please, solutions or some other ideas.

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  • Django - Override admin site's login form

    - by TrojanCentaur
    I'm currently trying to override the default form used in Django 1.4 when logging in to the admin site (my site uses an additional 'token' field required for users who opt in to Two Factor Authentication, and is mandatory for site staff). Django's default form does not support what I need. Currently, I've got a file in my templates/ directory called templates/admin/login.html, which seems to be correctly overriding the template used with the one I use throughout the rest of my site. The contents of the file are simply as below: # admin/login.html: {% extends "login.html" %} The actual login form is as below: # login.html: {% load url from future %}<!DOCTYPE html> <html> <head> <title>Please log in</title> </head> <body> <div id="loginform"> <form method="post" action="{% url 'id.views.auth' %}"> {% csrf_token %} <input type="hidden" name="next" value="{{ next }}" /> {{ form.username.label_tag }}<br/> {{ form.username }}<br/> {{ form.password.label_tag }}<br/> {{ form.password }}<br/> {{ form.token.label_tag }}<br/> {{ form.token }}<br/> <input type="submit" value="Log In" /> </form> </div> </body> </html> My issue is that the form provided works perfectly fine when accessed using my normal login URLs because I supply my own AuthenticationForm as the form to display, but through the Django Admin login route, Django likes to supply it's own form to this template and thus only the username and password fields render. Is there any way I can make this work, or is this something I am just better off 'hard coding' the HTML fields into the form for?

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  • Importing MEF-Plugins into MVC Controllers

    - by Marks
    Hello. There are several examples of using MEF to plugin whole controller/view packages into a MVC application, but i didn't found one, using MEF to plugin funcional parts, used by other controllers. For example, think of a NewsService with a simple interface like interface INewsService { List<NewsItem> GetAllNews(); } That gets news wherever he wants, and returns them in a List of NewsItems. My page should load an exported INewsService and show the news on the page. But there is the problem. I cant just use [Import] in the controllers, as they are just created when they are needed. Edit: (Importing them to the main MVCApplication class doesn't work, becouse i cant access it from the controllers.) I think i found a way to access the main app via HttpContext.ApplicationInstance. But the Service object in this instance is null although it was created successfully in the Application_Start() method. Any idea why? So, how can i access the NewsService from within a controller? Thanks in advance, Marks

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  • Conditional required field validation in an ASP.net ListView

    - by Jim Dagg
    I'm having a heck of a time trying to figure out how to implement validation in a ListView. The goal is to require the user to enter text in the comments TextBox, but only if the CheckBox is checked. Downside is that these controls are in the EditTemplate of a ListView. Below is a snippet of the relevant code portion of the EditTemplate: <tr style="background-color: #00CCCC; color: #000000"> <td> Assume Risk? <asp:CheckBox ID="chkWaive" runat="server" Checked='<%# Bind("Waive") %>' /> </td> <td colspan="5"> <asp:RequiredFieldValidator ID="RequiredFieldValidator1" runat="server" ErrorMessage="Comments required" ControlToValidate="txtComments" /> <asp:TextBox Width="95%" ID="txtComments" runat="server" Text='<%# Eval("Comment") %>'></asp:TextBox> </td> <td> <asp:Button ID="btnSave" runat="server" Text="Save" CommandName="Update" Width="100px" /> </td> </tr> Is there a way to do conditional validation using this method? If not, is there a way I could validate manually in the ItemUpdating event of the Listview, or somewhere else, and on a failure, alert the user of the error via a label or popup alert?

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  • How to find out if an object's type implements IEnumerable<X> where X derives from Base using Reflec

    - by Dave Van den Eynde
    Give a base class "Base", I want to write a method Test, like this: private static bool Test(IEnumerable enumerable) { ... } such that Test returns true if the type of o implements any interface of IEnumerable where X derives from Base, so that if I would do this: public static IEnumerable<string> Convert(IEnumerable enumerable) { if (Test(enumerable)) { return enumerable.Cast<Base>().Select(b => b.SomePropertyThatIsString); } return enumerable.Cast<object>().Select(o => o.ToString()); } ...that it would do the right thing, using Reflection. I'm sure that its a matter of walking across all the interfaces of the type to find the first that matches the requirements, but I'm having a hard time finding the generic IEnumerable< among them. Of course, I could consider this: public static IEnumerable<string> Convert(IEnumerable enumerable) { return enumerable.Cast<object>().Select(o => o is Base ? ((Base)o).SomePropertyThatIsString : o.ToString()); } ...but think of it as a thought experiment.

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  • Android: How to get a custom view to redraw partially?

    - by Peterdk
    I have a custom view that fills my entire screen. (A piano keyboard) When a user touches the key, it would cause a invalidate() to be called and the whole keyboard gets redrawn to show the new state with a touched key. Currently the view is very simple, but I plan to add a bit more nice graphics. Since the whole keyboard is dynamically rendered this would make redrawing the entire keyboard more expensive. So I thought, let's look into partial redrawing. Now I call invalidate(Rect dirty) with the correct dirty region. I set my onDraw(Canvas canvas) method to only draw the keys in the dirty region if I do indeed want a partial redraw. This results in those keys being drawn, but the rest of the keyboard is totally black/not drawn at all. Am I wrong in expecting that calling invalidate(Rect dirty) would "cache" the current canvas, and only "allows" drawing in the dirty region? Is there any way I can achieve what I want? (A way to "cache" the canvas and only redraw the dirty area?"

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  • php/mongodb: how does references work in php?

    - by harald
    hello, i asked this in the mongodb user-group, but was not satisfied with the answer, so -- maybe someone at stackoverflow can enlighten me: the question was: $b = array('x' => 1); $ref = &$b; $collection->insert($ref); var_dump($ref); $ref does not contain '_id', because it's a reference to $b, the handbook states. (the code snippet is taken from the php mongo documentation) i should add, that: $b = array('x' => 1); $ref = $b; $collection->insert($ref); var_dump($ref); in this case $ref contains the _id -- for those, who do not know, what the insert method of mongodb-php-driver does -- because $ref is passed by reference (note the $b with and without referencing '&'). on the other hand ... function test(&$data) { $data['_id'] = time(); } $b = array('x' => 1); $ref =& $b; test($ref); var_dump($ref); $ref contains _id, when i call a userland function. my question is: how does the references in these cases differ? my question is probably not mongodb specific -- i thought i would know how references in php work, but apparently i do not: the answer in the mongodb user-group was, that this was the way, how references in php work. so ... how do they work -- explained with these two code-snippets? thanks in advance!!!

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  • Unittesting Url.Action (using Rhino Mocks?)

    - by Kristoffer Ahl
    I'm trying to write a test for an UrlHelper extensionmethod that is used like this: Url.Action<TestController>(x => x.TestAction()); However, I can't seem set it up correctly so that I can create a new UrlHelper and then assert that the returned url was the expected one. This is what I've got but I'm open to anything that does not involve mocking as well. ;O) [Test] public void Should_return_Test_slash_TestAction() { // Arrange RouteTable.Routes.Add("TestRoute", new Route("{controller}/{action}", new MvcRouteHandler())); var mocks = new MockRepository(); var context = mocks.FakeHttpContext(); // the extension from hanselman var helper = new UrlHelper(new RequestContext(context, new RouteData()), RouteTable.Routes); // Act var result = helper.Action<TestController>(x => x.TestAction()); // Assert Assert.That(result, Is.EqualTo("Test/TestAction")); } I tried changing it to urlHelper.Action("Test", "TestAction") but it will fail anyway so I know it is not my extensionmethod that is not working. NUnit returns: NUnit.Framework.AssertionException: Expected string length 15 but was 0. Strings differ at index 0. Expected: "Test/TestAction" But was: <string.Empty> I have verified that the route is registered and working and I am using Hanselmans extension for creating a fake HttpContext. Here's what my UrlHelper extentionmethod look like: public static string Action<TController>(this UrlHelper urlHelper, Expression<Func<TController, object>> actionExpression) where TController : Controller { var controllerName = typeof(TController).GetControllerName(); var actionName = actionExpression.GetActionName(); return urlHelper.Action(actionName, controllerName); } public static string GetControllerName(this Type controllerType) { return controllerType.Name.Replace("Controller", string.Empty); } public static string GetActionName(this LambdaExpression actionExpression) { return ((MethodCallExpression)actionExpression.Body).Method.Name; } Any ideas on what I am missing to get it working??? / Kristoffer

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  • AES Encryption Java Invalid Key length

    - by wuntee
    I am trying to create an AES encryption method, but for some reason I keep getting a 'java.security.InvalidKeyException: Key length not 128/192/256 bits'. Here is the code: public static SecretKey getSecretKey(char[] password, byte[] salt) throws NoSuchAlgorithmException, InvalidKeySpecException{ SecretKeyFactory factory = SecretKeyFactory.getInstance("PBEWithMD5AndDES"); // NOTE: last argument is the key length, and it is 256 KeySpec spec = new PBEKeySpec(password, salt, 1024, 256); SecretKey tmp = factory.generateSecret(spec); SecretKey secret = new SecretKeySpec(tmp.getEncoded(), "AES"); return(secret); } public static byte[] encrypt(char[] password, byte[] salt, String text) throws NoSuchAlgorithmException, InvalidKeySpecException, NoSuchPaddingException, InvalidKeyException, InvalidParameterSpecException, IllegalBlockSizeException, BadPaddingException, UnsupportedEncodingException{ SecretKey secret = getSecretKey(password, salt); Cipher cipher = Cipher.getInstance("AES"); // NOTE: This is where the Exception is being thrown cipher.init(Cipher.ENCRYPT_MODE, secret); byte[] ciphertext = cipher.doFinal(text.getBytes("UTF-8")); return(ciphertext); } Can anyone see what I am doing wrong? I am thinking it may have something to do with the SecretKeyFactory algorithm, but that is the only one I can find that is supported on the end system I am developing against. Any help would be appreciated. Thanks.

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  • GZIP Java vs .NET

    - by Jim Jones
    Using the following Java code to compress/decompress bytes[] to/from GZIP. First text bytes to gzip bytes: public static byte[] fromByteToGByte(byte[] bytes) { ByteArrayOutputStream baos = null; try { ByteArrayInputStream bais = new ByteArrayInputStream(bytes); baos = new ByteArrayOutputStream(); GZIPOutputStream gzos = new GZIPOutputStream(baos); byte[] buffer = new byte[1024]; int len; while((len = bais.read(buffer)) >= 0) { gzos.write(buffer, 0, len); } gzos.close(); baos.close(); } catch (IOException e) { e.printStackTrace(); } return(baos.toByteArray()); } Then the method that goes the other way compressed bytes to uncompressed bytes: public static byte[] fromGByteToByte(byte[] gbytes) { ByteArrayOutputStream baos = null; ByteArrayInputStream bais = new ByteArrayInputStream(gbytes); try { baos = new ByteArrayOutputStream(); GZIPInputStream gzis = new GZIPInputStream(bais); byte[] bytes = new byte[1024]; int len; while((len = gzis.read(bytes)) > 0) { baos.write(bytes, 0, len); } } catch (IOException e) { e.printStackTrace(); } return(baos.toByteArray()); } Think there is any effect since I'm not writing out to a gzip file? Also I noticed that in the standard C# function that BitConverter reads the first four bytes and then the MemoryStream Write function is called with a start point of 4 and a length of input buffer length - 4. So is that effect the validity of the header? Jim

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