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• Can I get the item type from a BindingSource?

  - by Preston

  I would like to get the Type of item that a BindingSource is hooked up to or configured for. The BindingSource.DataSource property can be set to an object, list, or type. If it is a Type, it obviously does not have an bound item yet, but I would still like to get the Type. For a List, I need the item Type, not the list type. There is a method BindingSource.GetItemProperties, that accomplishes most of what I need. It gets the PropertyDescriptors for the Type, list item, or object specified by the DataSource and DataMember. The reason I ask, is that I have some components that I would like to re-use, but they are currently setup to work off of an item Type. The Type is mainly used to get PropertyInfos and then build a UI, but PropertyInfo and PropertyDescriptor is not exactly the same, so it is not immediately apparent that they can be reworked to use a PropertyDescriptor collection instead. Then there is cascading refactoring of everything already using these components and that adds up to a lot of work that I would rather not do. I've looked through the API docs for for a good way to do this, but so far I have not had any luck. Am I missing something or is this just something I can not or should not be doing?

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• How to use ContentPresenter on Window?

  - by mybrokengnome

  I've got a ResourceDictionary file that contains a bunch of resources to define elements of my UI. Including one for my DialogWindows, which will just be Windows. <Style x:Key="DialogWindow" TargetType="{x:Type Window}" > <Setter Property="OverridesDefaultStyle" Value="True"/> <Setter Property="WindowStyle" Value="None" /> <Setter Property="Template"> <Setter.Value> <ControlTemplate TargetType="{x:Type Window}"> <Grid Background="{StaticResource SunkenBackground}"> <StackPanel Margin="20,20,20,20" Background="{StaticResource SunkenBackground}"> <AdornerDecorator> <ContentPresenter/> </AdornerDecorator> </StackPanel> </Grid> </ControlTemplate> </Setter.Value> </Setter> </Style> As you can see every DialogWindow should have a grid and a stackpanel, and then the content goes inside there. I've added the file to my App.xaml, and on one of my dialog windows I added Style="{StaticResource DialogWindow}". So the question is: Now that I have my Template set up for a window, and things are actually styled properly once I've added the StaticResource, what tags do I use to wrap my content in inside of my DialogWindow? I tried wrapping them inside Grid, but that just breaks the layout. If I wrap them inside a StackPanel, they look correct, but then I've got 2 StackPanels and a Grid, when if I didn't include the template I could just have 1 StackPanel and a Grid (I realize I could just take the stackpanel out of the template and do it for every DialogWindow, but that doesn't seem like a good solution). Thanks!

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• Copy constructor called even when returning by reference?

  - by Johnyy

  Hi, I am testing the return of local objects by reference. My original test went well but something else happens unexpected. #include <iostream> using namespace std; class MyInt { public: MyInt(int i){ value = new int(i); } ~MyInt(){ delete value; } int getValue(){ return *value; } MyInt(const MyInt &b){ cout<<"Copy"<<endl; } private: int* value; }; MyInt& returnref(){ MyInt a(10); cout<<"Returning from returnref()"<<endl; return a; } int main(){ MyInt a = returnref(); cout<<a.getValue()<<endl; return 0; } My console prints "Returning from ..." then "Copy" then a random value. My understanding of pass by reference is that it does not need to make any copy. Why is it not doing what I expected?

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• Conditional execution of EventTriggers in Silverlight 3

  - by Jason

  I'm currently working on the UI of a Silverlight application and need to be able to change the visual state of a control to one of two possible states based on it's current state when handling the same event trigger. For example: I have a control that sits partially in a clipping path, when I click the visible part of the control I want to change the state to "visible" and if I click it again when it is in its "visible" state I want to change to the "hidden" state. Example XAML: <i:Interaction.Triggers> <i:EventTrigger EventName="MouseLeftButtonUp"> <ic:GoToStateAction StateName="Visible"/> <ic:GoToStateAction StateName="Hidden"/> </i:EventTrigger> </i:Interaction.Triggers> Where "i" is "System.Windows.Interactivity;assembly=System.Windows.Interactivity" and "ic" is "Microsoft.Expression.Interactivity.Core;assembly=Microsoft.Expression.Interactions". I'm currently working in Expression Blend 3 and would prefer to have a XAML only solution but am not opposed to coding this if it is completely necessary. I have tried recording a change in the target state name in Blend but this did not work. Any thoughts on this?

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• How can I define an empty array in a Perl construtor?

  - by Laimoncijus

  I am just beginner with Perl, so if it sounds stupid - sorry for that :) My problem is - I am trying to write a class, which has an empty array, defined in constructor of a class. So I am doing this like this: package MyClass; use strict; sub new { my ($C) = @_; my $self = { items => () }; bless $self, ref $C || $C; } sub get { return $_[0]->{items}; } 1; Later I am testing my class with simple script: use strict; use Data::Dumper; use MyClass; my $o = MyClass->new(); my @items = $o->get(); print "length = ", scalar(@items), "\n", Dumper(@items); And while running the script I get following: $ perl my_test.pl length = 1 $VAR1 = undef; Why am I doing wrong what causes that I get my items array filled with undef? Maybe someone could show me example how the class would need to be defined so I would not get any default values in my array?

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• Xcode: how to know a header file is actually imported?

  - by Philip007

  To be specific, I am using RestKit framework. I want to use a framework class category called RKObjectManager+RKTableController in my view controller mainTVC. Here is my #import section in mainTVC.m: // framework headers, which should be enough #import <RestKit/RestKit.h> #import <RestKit/UI.h> // my project headers, not relating to framework #import "MainTVC.h" #import "Photo.h" // Do this to guarantee import does happen. But still got error, see below #import <RestKit/RKObjectManager+RKTableController.h> However, Xcode issue an error: No known class method for selector 'fetchRequest:groupedBy:inContext:' For reference, this method is a class method declared only in category header RKObjectManager+RKTableController.h, but not in 'RKObjectManager.h`. Also, I added -ObjC and -all_load to "other linker flags" in build settings, if that's relevant. I suspect the error is caused by the fact that category header is not actually imported somehow. How can I verify that? Or the error is caused by other reasons that I am not aware of. What am I doing wrong?

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• How to make groupbox invisble on select of a radiobutton

  - by Aditya

  Hi, I am doing an Windows Application using XAML ,WPF in C#. I have 2 radio buttons called "WriteData" and "ReadData". when writeData is selected, I need groupbox with a textbox and browse button inside it to be displayed at a particular location, (this i have already designed in UI..) <GroupBox Header="Browse Data" Name="grpBrowseData" Height="78" VerticalAlignment="Top" HorizontalAlignment="Left" Width="1030"> <Grid Name="grdBrowse" Height="60" Width="1030"> <Button x:Name="btnBrowseButton" Margin="0,7.5,45,20" Content="Browse" Click="BrowseButton_Click" HorizontalAlignment="Right" Width="111" /> <TextBox x:Name="txtBxBrowseTB" Margin="46,13.993,185,17.5" Text="TextBox" TextWrapping="Wrap" TextChanged="BrowseTB_TextChanged" ></TextBox> <Label HorizontalAlignment="Left" Margin="-1.25,8.75,0,15" Name="label1" Width="47.5" FontSize="13" VerticalContentAlignment="Center" HorizontalContentAlignment="Center">Path:</Label> Now, if I select "ReadData" radio button, a combo box should be visible in the SAME LOCATION where the above groupbox is displayed, the xaml code for this <GroupBox Header="Select the Project" Name="grpSelectProject" Height="78" VerticalAlignment="Top" HorizontalAlignment="Left" Width="1030" Visibility="Visible" Margin="-1030,0,0,0"> <Grid Name="grdSelectProject" Height="60" Width="1030"> <Label HorizontalAlignment="Left" VerticalContentAlignment="Center" HorizontalContentAlignment="Center" Margin="0,11.662,0,20.825" Width="95.103">Select the Project</Label> <ComboBox Margin="119.952,13.994,493.969,16.66"></ComboBox> </Grid></GroupBox> so, how do I make only one visible as per the radio button selected. In the ReadData_click event i tried to make other groupbox invisble. but I wasnt able to do that. please help me. Thanks Ramm

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• Working With Feeds and Lists

  - by Nathan Campos

  I'm using a ListView component to list up some informations at a RSS feed, but when the user clicks the row, I want to change into a detailed view of that RSS Item, so far I've done this: function parseFeed(feed) { var html = ""; for(var i = 0; i < feed.items.length && i < 5; i++) { var item = feed.items[i]; var title = item.title; html += "\n<li onClick='goDetailed()'>\n"; html += "<h3><a href='#' class='ui-link-inherit'>" + title + "</a></h3>\n"; html += "<p>" + item.description + "</p>\n"; html += "</li>"; } $("#dList").append(html); $("#dList").listview('refresh'); } function goDetailed() { $.mobile.changePage($('#detailedPage')); } One of my problems is that the Back button won't come back(it does nothing). My other question is how I can pass the item.title, item.description, item.link and item.updated of the selected row(feed item) to some <div data-role="content">'s at the detail page.

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• Is Google Mock a good mocking framework ?

  - by des4maisons

  I am pioneering unit testing efforts at my company, and need need to choose a mocking framework to use. I have never used a mocking framework before. We have already chosen Google Test, so using Google Mock would be nice. However, my initial impressions after looking at Google Mock's tutorial are: The need for re-declaring each method in the mocking class with a MOCK_METHODn macro seems unnecessary and seems to go against the DRY principle. Their matchers (eg, the '_' in EXPECT_CALL(turtle, Forward(_));) and the order of matching seem almost too powerful. Like, it would be easy to say something you don't mean, and miss bugs that way. I have high confidence in google's developers, and low confidence in my own ability to judge mocking frameworks, never having used them before. So my question is: Are these valid concerns? Or is there no better way to define a mock object, and are the matchers intuitive to use in practice? I would appreciate answers from anyone who has used Google Mock before, and comparisons to other C++ frameworks would be helpful.

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• testng multiple suites

  - by Eli

  Hi people. my problem is as follows: i am testing a web-ui using selenium and testng. i have a test suite with many test classes in it. i have a method with the @BeforeSuite witch also has a @Parameters annotation, this method recieves as a parameter the browser in witch the selenium will test by run,executing the lines: selenium = new DefaultSelenium("localhost", 4444, **browser**, "http://localhost:8099"); selenium.start(); the xml im using to run the test suite is: <suite name="suite"> <parameter name = "browser" value = "*firefox"/> <test name="allTests"> <classes> <class name="test.webui.MemcachedDeploymentTest" /> </classes> </test> </suite> this works fine and the test runs in firefox. my problem is that i would like to somehow run this suite again, immediatly after the first run finishes, but this time with chrome as the browser. i now have 2 xml suites, one with chrome and one with firefox, is there any way to run these test suites one after the other automatically? maybe using a third xml? Thanks in advance

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• IIS7 dynamic content compression and webservices

  - by vandalo

  I am moving and old asmx webservice to a new server with IIS7. This webservice basically sends a big dataset (10mb+) to a winform application. The old solution was implemented using a custom soap extension which compressed the content before sending the stream to the client. The client, of course, implemented the same custom soap extension, to decompressed the stream in a dataset. Everything has worked pretty well for years. My customer doesn't want to change the code upgrading to WCF. They just want to put the old App on the new server and use the new dynamic content compression features. We're testing things on a test server (win serv 2008) and it seems that it's working pretty well, even if it seems slow: we can't see any difference in performance (speed) between the uncompressed and compressed stream. Here's the question. Where should I put the settings? Most people say I can't put it in my web.config; others say it can be put there. I am a bit confused. Are there any tricks or things I should know? What about mimeTypes? Should I set some parameters, somewhere? ... considering my stream is XML (dataset) ?? Thanks to everyone who would like to help Alberto

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• How to decide between using PLINQ and LINQ at runtime?

  - by Hamish Grubijan

  Or decide between a parallel and a sequential operation in general. It is hard to know without testing whether parallel or sequential implementation is best due to overhead. Obviously it will take some time to train "the decider" which method to use. I would say that this method cannot be perfect, so it is probabilistic in nature. The x,y,z do influence "the decider". I think a very naive implementation would be to give both 1/2 chance at the beginning and then start favoring them according to past performance. This disregards x,y,z, however. I suspect that this question would be better answered by academics than practitioners. Anyhow, please share your heuristic, your experience if any, your tips on this. Sample code: public interface IComputer { decimal Compute(decimal x, decimal y, decimal z); } public class SequentialComputer : IComputer { public decimal Compute( ... // sequential implementation } public class ParallelComputer : IComputer { public decimal Compute( ... // parallel implementation } public class HybridComputer : IComputer { private SequentialComputer sc; private ParallelComputer pc; private TheDecider td; // Helps to decide between the two. public HybridComputer() { sc = new SequentialComputer(); pc = new ParallelComputer(); td = TheDecider(); } public decimal Compute(decimal x, decimal y, decimal z) { decimal result; decimal time; if (td.PickOneOfTwo() == 0) { // Time this and save result into time. result = sc.Compute(...); } else { // Time this and save result into time. result = pc.Compute(); } td.Train(time); return result; } }

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• java: libraries for immutable functional-style data structures

  - by Jason S

  This is very similar to another question (Functional Data Structures in Java) but the answers there are not particularly useful. I need to use immutable versions of the standard Java collections (e.g. HashMap / TreeMap / ArrayList / LinkedList / HashSet / TreeSet). By "immutable" I mean immutable in the functional sense (e.g. purely functional data structures), where updating operations on the data structure do not change the original data, but instead return a new instance of the same kind of data structure. Also typically new and old instances of the data structure will share immutable data to be efficient in time and space. From what I can tell my options include: Functional Java Scala Clojure but I'm not sure whether any of these are particularly appealing to me. I have a few requirements/desirements: the collections in question should be usable directly in Java (with the appropriate libraries in the classpath). FJ would work for me; I'm not sure if I can use Scala's or Clojure's data structures in Java w/o having to use the compilers/interpreters from those languages and w/o having to write Scala or Clojure code. Core operations on lists/maps/sets should be possible w/o having to create function objects with confusing syntaxes (FJ looks slightly iffy) They should be efficient in time and space. I'm looking for a library which ideally has done some performance testing. FJ's TreeMap is based on a red-black tree, not sure how that rates. Documentation / tutorials should be good enough so someone can get started quickly using the data structures. FJ fails on that front. Any suggestions?

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• PayPal sandbox anomalies

  - by Christian

  When testing some donations on my local machine, I set various key=value pairs to do various things (return to specific thank you page, get POST data from PayPal and not GET data and others) I also built my code around the response from the PayPal sandbox. BUT, when my code goes to the production server and we switch on live payments and test with real accounts and money, a few strange things happen; We get a GET response from PayPal - the URL is filled with crap. We get no transaction details. This is the biggie, no name, no txn_id, no dates, nothing. We get a handful of keys etc, its not totally empty and the payment has gone through, but nowhere near the verbosity of the sandbox. Curious about why this might be? It doesn't really make sense to have a sandbox (or dev environment) that is substantially different from the production environment. Or, am I missing something? EDIT: Still no response to my question in the PayPal Developer Forums. I don't even get a donation amount back from PayPal. Is this a setting maybe? EDIT #2: Two of you have suggested to check PDT and Auto-Return. The data analytics guy for the project only 2 hrs ago suggested the same. I have asked the client to confirm this. I can't see a setting for it in the Sandbox so can assume that it is enabled by default?

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• Logging in "Java Library Code" libs for Android applications

  - by K. Claszen

  I follow the advice to implement Android device (not application!) independent library code for my Android Apps in a seperate "Java Library Code" project. This makes testing easier for me as I can use the standard maven project layout, Spring test support and Continuous Build systems the way I am used to. I do not want to mix this inside my Android App project although this might be possible. I now wonder how to implement logging in this library. As this library will be used on the Android device I would like to go with android.util.Log. I added the followind dependency to my project to get the missing Android packages/classes and dependencies: <dependency> <groupId>com.google.android</groupId> <artifactId>android</artifactId> <version>2.2.1</version> <scope>provided</scope> </dependency> But this library just contains stub method (similar to the android.jar inside the android-sdk), thus using android.util.Log results in java.lang.RuntimeException: Stub! when running my unit tests. How do I implement logging which works on the Android device but does not fail outside (I do not expect it to work, but it must not fail)? Thanks for any advice Klaus For now I am going with the workaround to catch the exception outside android but hope there is a better solution. try { Log.d("me", "hello"); } catch (RuntimeException re) { // ignore failure outside android }

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• Avoid an "out of memory error" in Java(eclipse), when using large data structure?

  - by gnomed

  OK, so I am writing a program that unfortunately needs to use a huge data structure to complete its work, but it is failing with a "out of memory error" during its initialization. While I understand entirely what that means and why it is a problem, I am having trouble overcoming it, since my program needs to use this large structure and I don't know any other way to store it. The program first indexes a large corpus of text files that I provide. This works fine. Then it uses this index to initialize a large 2D array. This array will have nXn entries, where "n" is the number of unique words in the corpus of text. For the relatively small chunk I am testing it on(about 60 files) it needs to make approximately 30,000x30,000 entries. this will probably be bigger once I run it on my full intended corpus too. It consistently fails every time, after it indexes, while it is initializing the data structure(to be worked on later). Things I have done include: revamp my code to use a primitive "int[]" instead of a "TreeMap" eliminate redundant structures, etc... Also, I have run eclipse with "eclipse -vmargs -Xmx2g" to max out my allocated memory I am fairly confident this is not going to be a simple line of code solution, but is most likely going to require a very new approach. I am looking for what that approach is, any ideas? Thanks, B.

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• I Cannot retrieve ARPINSTALLLOCATION so we know where to install a new version [WIX]

  - by Birkoff

  I am trying to retrieve the ARPINSTALLLOCATION during the installation of a Major Upgrade version of the software. Following this info I managed to set the ARPINSTALLLOCATION to the custom path. However, retrieving it again isn't working. I've tried many things over the past days but it keeps defaulting back to the default installation path instead of the custom one. <InstallUISequence> <AppSearch After="FindRelatedProducts"/> ... </InstallUISequence> <Property Id="WIXUI_INSTALLDIR" Value="APPROOTDIRECTORY"> <RegistrySearch Id="FindInstallLocation" Root="HKLM" Key="Software\Microsoft\Windows\CurrentVersion\Uninstall\[OLDERVERSIONBEINGUPGRADED]" Name="InstallLocation" Type="raw" /> </Property> In the custom WixUI_InstallDir UI I have this in the CustomInstallDirDlg <Control Id="Folder" Type="PathEdit" X="20" Y="90" Width="260" Height="18" Property="WIXUI_INSTALLDIR" Indirect="yes" /> The alternative install path is in the registry, but it isn't retrieved and shown in the control. What am I doing wrong here? -Birkoff

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• Message sent to deallocated instance which has never been released

  - by Jakub

  Hello, I started dealing with NSOperations and (as usual with concurrency) I'm observing strange behaviour. In my class I've got an instance variable: NSMutableArray *postResultsArray; when one button in the UI is pressed I initialize the array: postResultsArray = [NSMutableArray array]; and setup the operations (together with dependencies). In the operations I create a custom object and try to add to the array: PostResult *result = [[PostResult alloc] initWithServiceName:@"Sth" andResult:someResult]; [self.postResultsArray addObject:result]; and while adding I get: -[CFArray retain]: message sent to deallocated instance 0x3b40c30 which is strange as I don't release the array anywhere in my code (I did, but when the problem started to appear I commented all the release operations to be sure that they are not the case). I also used to have @synchronized section like below: PostResult *result = [[PostResult alloc] initWithServiceName:@"Sth" andResult:someResult]; @synchronized (self.postResultsArray) { [self.postResultsArray addObject:result]; } but the problem was the same (however, the error was for the synchronized operation). Any ideas what I may be doing wrong?

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• Strange behaviour of CheckBox and TwoWay bound property

  - by walkor

  Hello, everyone. I fell in the following situation: I have a main UserControl with a DataGrid (which contains List). I need to show different panels depending on properties of the selected row(object). So i've created 2 controls and included them into this main control. Main control has 2 public properties - public List<ComplexObject> SourceList { get; set; } and public ComplexObject CurrentObject { get; set; } Pseudo-code: <UserControl x:Name="Main"> <DataGrid ItemsSource="{Binding SourceList}" SelectedItem="{Binding CurrentObject, Mode=TwoWay}"/> <Controls:RightPanelFirst Visibility="condition2"/> <Controls:RightPanelSecond Visibility="condition2"/> </UserControl> RightPanelFirst and RightPanelSecond have the following xaml: <UserControl> <... content here...> <CheckBox IsChecked="{Binding CurrentObject.ComplexProperty.SimpleProperty1, Mode=TwoWay}"> <CheckBox IsChecked="{Binding CurrentObject.ComplexProperty.SimpleProperty2, Mode=TwoWay}" x:Name="cbSecond"> <TextBox IsEnabled="{Binding IsChecked, ElementName=cbSecond}"/> </UserControl> So, my actual steps: Check both checkboxes (object values are set to true) Make other actions in code behind which modify CurrentObject. Then i want UI to reflect the changes, so I call NotifyPropertyChanged("CurrentObject"); SimpleProperty1 remains the same, but SimpleProperty2 resets to false I have no idea why this happens, can anyone help me please? Silverlight drives me mad.

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• Java Input/Output streams for unnamed pipes created in native code?

  - by finrod

  Is there a way to easily create Java Input/Output streams for unnamed pipes created in native code? Motivation: I need my own implementation of the Process class. The native code spawns me a new process with subprocess' IO streams redirected to unnamed pipes. Problem: The file descriptors for correct ends of those pipes make their way to Java. At this point I get stuck as I cannot create a new FileDescriptor which I could pass to FileInput/FileOutput stream. I have used reflection to get around the problem and got communication with a simple bouncer sub-process running. However I have a notion that it is not the cleanest way to go. Have you used this approach? Do you see any problems with this approach? (the platform will never change) Searching around the internets revealed similar solution using native code. Any thoughts before I dive into heavy testing of this approach are very welcome. I would like to give a shot to existing code before writing my own IO stream implementations... Thank you.

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• Rails 3, Devise and custom controller action

  - by Johnny Klassy

  routes.rb match 'agencies/stub' => 'agencies#stub', :via => :get resources :agencies Here's the rake routes dump agencies_stub GET /agencies/stub(.:format) {:controller=>"agencies", :action=>"stub"} agencies GET /agencies(.:format) {:action=>"index", :controller=>"agencies"} POST /agencies(.:format) {:action=>"create", :controller=>"agencies"} new_agency GET /agencies/new(.:format) {:action=>"new", :controller=>"agencies"} edit_agency GET /agencies/:id/edit(.:format) {:action=>"edit", :controller=>"agencies"} agency GET /agencies/:id(.:format) {:action=>"show", :controller=>"agencies"} PUT /agencies/:id(.:format) {:action=>"update", :controller=>"agencies"} DELETE /agencies/:id(.:format) {:action=>"destroy", :controller=>"agencies"} Devise is setup to have all agenciesroutes only accessible as admin. The call I'm testing with is http://xyz:12345@localhost:3000/agencies/stub but it doesn't authenticate properly, ie, it doesn't recognize it as admin and throws me back to the Devise login page. The creds are a valid admin account. I'm baffled and have no idea why this is happening. Any insights will be much appreciated.

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• How to find out where a thread lock happend?

  - by SchlaWiener

  One of our company's Windows Forms application had a strange problem for several month. The app worked very reliable for most of our customers but on some PC's (mostly with a wireless lan connection) the app sometimes just didn't respond anymore. (You click on the UI and windows ask you to wait or kill the app). I wasn't able to track down the problem for a long time but now I figured out what happend. The app had this line of code // don't blame me for this. Wasn't my code :D Control.CheckForIllegalCrossThreadCalls = false and used some background threads to modify the controls. No I found a way to reproduce the application stopping responding bug on my dev machine and tracked it down to a line where I actually used Invoke() to run a task in the main thread. Me.Invoke(MyDelegate, arg1, arg2) Obviously there was a thread lock somewhere. After removing the Control.CheckForIllegalCrossThreadCalls = false statement and refactoring the whole programm to use Invoke() if modifying a control from a background thread, the problem is (hopefully) gone. However, I am wondering if there is a way to find such bugs without debugging every line of code (Even if I break into debugger after the app stops responding I can't tell what happend last, because the IDE didn't jump to the Invoke() statement) In other words: If my apps hangs how can I figure out which line of code has been executed last? Maybe even on the customers PC. I know VS2010 offers some backwards debugging feature, maybe that would be a solution, but currently I am using VS2008.

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• how to switch views according to command

  - by Veer

  I've a main view and many usercontrols. The main view contains a two column grid, with the first column filled with a listbox whose datatemplate consists of a usercontrol and the second column filled with another usercontrol. These two usercontrols have the same datacontext. MainView: <Grid> //Column defs ... <ListView Grid.Column="0" ItemSource="{Binding Foo}"> ... <DataTemplate> <Views: FooView1 /> </DataTemplate> </ListView> <TextBlock Text="{Binding Foo.Count}" /> <StackPanel Grid.Column="1"> <Views: FooView2 /> </StackPanel> <Grid> FooView1: <UserControl> <TextBlock Text="{Binding Foo.Title}"> </UserControl> FooView2: <UserControl> <TextBlock Text="{Binding Foo.Detail1}"> <TextBlock Text="{Binding Foo.Detail2}"> <TextBlock Text="{Binding Foo.Detail3}"> <TextBlock Text="{Binding Foo.Detail4}"> </UserControl> I've no IDE here. Excuse me if there is any syntax error When the user clicks on a button. These two usercontrols have to be replaced by another two usercontrols, so the datacontext changes, the main ui remaining the same. ie, FooView1 by BarView1 and FooView2 by BarView2 In short i want to bind this view changes in mainview to my command (command from Button) How can i do this? Also tell me if i could merge the usercontrol pairs, so that only one view exists for each viewmodel ie, FooView1 and FooView2 into FooView and so on...

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• Negative number representation across multiple architechture

  - by Donotalo

  I'm working with OKI 431 micro controller. It can communicate with PC with appropriate software installed. An EEPROM is connected in the I2C bus of the micro which works as permanent memory. The PC software can read from and write to this EEPROM. Consider two numbers, B and C, each is two byte integer. B is known to both the PC software and the micro and is a constant. C will be a number so close to B such that B-C will fit in a signed 8 bit integer. After some testing, appropriate value for C will be determined by PC and will be stored into the EEPROM of the micro for later use. Now the micro can store C in two ways: The micro can store whole two byte representing C The micro can store B-C as one byte signed integer, and can later derive C from B and B-C I think that two's complement representation of negative number is now universally accepted by hardware manufacturers. Still I personally don't like negative numbers to be stored in a storage medium which will be accessed by two different architectures because negative number can be represented in different ways. For you information, 431 also uses two's complement. Should I get rid of the headache that negative number can be represented in different ways and accept the one byte solution as my other team member suggested? Or should I stick to the decision of the two byte solution because I don't need to deal with negative numbers? Which one would you prefer and why?

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• Datareceived Serialport event stops raising after some seconds

  - by Mario

  Hi, I was hoping someone could help me out with this problem. I have a system (VB .NET) where I must read a person's weight (RS232 Sluice) and id (Fingerprint - 2 biometric reader, rs232) and compare it to a database. I have 3 serialports in my app, one for the sluice and the other 2 are to receive the id from the fingerprint readers, both of which call the same sub to get the id from the reader. I've been testing just one reader and it seemed to work fine, I got data from the datareceived and joined it together to get the id. The problem comes at this moment: I put a finger, sends the id, if it's ok sends a message, otherwise, writes the id to a textbox. But in-between reads, if I let 5 or 10 seconds pass without putting a finger on the reader it seems like I get no data at all anymore, the datareceived event nevers gets raised but if I keep putting a finger constantly it works pretty good, this is really weird to me. I was thinking of some things: **Maybe the port gets closed somehow after some time? I never call the CLose() method **The fact both datareceived eventhandlers call the same method and delegate **Maybe the connection settings are missing something? I tested with hyperterminal and the port keeps getting info even after time without activity and I use the same config with my application, maybe I need to change more settings like DTEenable and RTSenable? Please I need some help with this issue, it's to control access so it needs to be running 24/7 thanks in advance!

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