I want to raise an event from a .NET class, and receive this event in Silverlight code (out-of-browser, using the COM interop support added in SL4).
Can anyone point out the problem in my code? Do I maybe need to do more attribute-decorated interface boilerplate to get this working?
Code:
Rather than write native COM code, I am writing .NET code and exposing it via COM interop.
My event-raising .NET class looks like this:
using System;
namespace TestComInterop2 {
public class TestClass {
public event EventHandler TestEvent;
public void Fire() {
if (TestEvent != null)
TestEvent(this, EventArgs.Empty);
}
}
}
My SL4 client code looks like this:
...
private delegate void HandlerDelegate(dynamic sender, dynamic eventArgs);
private void TestEventSinking(object sender, RoutedEventArgs e)
{
// Create instance of COM-registered .NET class
var testClass = AutomationFactory.CreateObject("TestComInterop2.TestClass");
// Subscribe to event (second line fails with System.Exception)
//
// "Failed to add event handler. Possible reasons include: the object does not
// support this or any events, or something failed while adding the event."
//
AutomationEvent testEvent = AutomationFactory.GetEvent(testClass, "TestEvent");
testEvent.AddEventHandler(new HandlerDelegate(HandleTestEvent));
// Fire the event
testClass.Fire();
}
private void HandleTestEvent(object sender, object eventargs)
{
MessageBox.Show("Event fired");
}
...
Use the [ComSourceInterface] attribute on your class. The relevant MSDN Library topic is here.
Related
I am trying to configure my installer so that it will close any instances of the application before installation starts and relaunch the application once installation has finished.
The MS documents provide and example similar to the one below and indicate that the [RunInstaller(true)] annotation specifies whether the Visual Studio Custom Action Installer or the Installutil.exe (Installer Tool) should be invoked when the assembly is installed.
Of course this could mean just about anything...
I am using the Visual Studio Project Installer NuGet package to create the install files (setup.exe and APP.msi files). When configuring the Project Installer there is an option set configure the Custom Actions - I assume this is what the documentation means.
However the Custom Actions has options to add things to the Install, Commit sections - what has to be added to these sections and how does this relate to the Installer class defined below.
This whole area of installation seems to be poorly documented and there seem to be so many options, none of which seem to work properly.
You would think closing any running instances before installing an update and then relaunching after completing the installation would be a no brainer but it seems anything but simple.
Appreciate any assistance with a working example of how this can be achieved.
namespace FocusBracketer
{
[RunInstaller(true)]
public partial class Installer: System.Configuration.Install.Installer
{
public Installer() : base()
{
InitializeComponent();
// Attach the 'BeforeInstall' event.
this.BeforeInstall += new InstallEventHandler(Installer_BeforeInstall);
// Attach the 'Committed' event.
this.Committed += new InstallEventHandler(Installer_Committed);
// Attach the 'Committing' event.
this.Committing += new InstallEventHandler(Installer_Committing);
}
// Event handler for 'BeforeInstall' event.
private void Installer_BeforeInstall(object sender, InstallEventArgs e)
{
Console.WriteLine("");
Console.WriteLine("BeforeInstall Event occurred.");
Console.WriteLine("");
}
// Event handler for 'AfterInstall' event.
private void Installer_AfterInstall(object sender, InstallEventArgs e)
{
Console.WriteLine("");
Console.WriteLine("AfterInstall Event occurred.");
Console.WriteLine("");
System.Diagnostics.Process.Start(System.IO.Path.GetDirectoryName(this.Context.Parameters["AssemblyPath"]) + #"\FocusBracketer.exe");
}
// Event handler for 'Committing' event.
private void Installer_Committing(object sender, InstallEventArgs e)
{
Console.WriteLine("");
Console.WriteLine("Committing Event occurred.");
Console.WriteLine("");
}
// Event handler for 'Committed' event.
private void Installer_Committed(object sender, InstallEventArgs e)
{
Console.WriteLine("");
Console.WriteLine("Committed Event occurred.");
Console.WriteLine("");
}
// Override the 'Install' method.
public override void Install(IDictionary savedState)
{
base.Install(savedState);
}
// Override the 'Commit' method.
public override void Commit(IDictionary savedState)
{
base.Commit(savedState);
}
// Override the 'Rollback' method.
public override void Rollback(IDictionary savedState)
{
base.Rollback(savedState);
}
public static void Main()
{
Console.WriteLine("Usage : installutil.exe Installer.exe ");
}
}
}
Ok, so, I'm trying to link an ObservableCollection from my Android project to my Cross-Platform Project::
I've got this so far...this is in my Cross-platform app
ObservableCollection<String> NewRef = DependencyService.Get<ISlateBluetoothItems>().test().testThing;
NewRef.CollectionChanged += TestThing_CollectionChanged;
listView.ItemsSource = NewRef;
private void TestThing_CollectionChanged(object sender, System.Collections.Specialized.NotifyCollectionChangedEventArgs e)
{
listView.ItemsSource = DependencyService.Get<ISlateBluetoothItems>().test().testThing;
Console.WriteLine("working");
}
The line "working" is never printed even if I make changes to the ObservableCollection on the android portion of my app...
Here's the interface I'm using for the DependencyService:
using System.Collections.ObjectModel;
namespace ThoughtCastRewrite.BluetoothX
{
public interface ISlateBluetoothItems
{
BluetoothItems test();
}
}
Here's the class I use to expose the list:
namespace ThoughtCastRewrite.BluetoothX
{
public class BluetoothItems
{
public ObservableCollection<String> testThing;
public BluetoothItems()
{
testThing = new ObservableCollection<String>();
testThing.Add("wtf?");
}
public void AddThis()
{
testThing.Add("ok");
}
}
}
This is in the Android portion of my app, it implements the ISlateBluetoothItems interface
BluetoothItems bluetoothItems = new BluetoothItems();
then I call
bluetoothItems.AddThis();
but "ok" is not added to my list! I don't get the CollectionChanged event firing off! What's the deal guys? What's the deal?
You should assign your ObservableCollection as a source of your listview only once, not after each change. Changes to the collection will be automaticcly propagated to the listview.
I am trying to get a function to be called everytime an event occurs. In the KinectRegion class there is an event called HandPointerGrip: http://msdn.microsoft.com/en-us/library/microsoft.kinect.toolkit.controls.kinectregion.handpointergrip.aspx.
I see that it has declared the event and it seems to me that the event has already been set to be invoked(HandPointerEventArgs)? How do I attach a function to this event?
public Menu()
{
KinectRegion.HandPointerGripEvent+=Hand_Gripped; // why doesn't this work? :(
}
private void Hand_Gripped(object sender, HandPointerEvnetArgs e)
{
MessageBox.Show("I work!"); // I wish this would work
}
Been working hard on this problem and here is something I think will work. Afraid to test it. Learning a lot about routed events, delegates, and events.
namespace ...
{
public delegate void HandPointerEventHandler(object sender, HandPointerEventArgs e);
public partial class thePage : Page
{
public event HandPointerEventHandler HandGripped
{
add {this.AddHandler(KinectRegion.HandPointerGripEvent,value);}
remove {this.RemoveHandler(KinectRegion.HandPointerGripEvent,vlaue);}
}
public thePage()
{
InitializeComponent();
this.HandGripped += new HandPointerEventHandler(OnHandGripped);
}
protected virtual void OnHandGripped(object sender, HandPointerEventArgs e)
{
MessageBox.Show("hello"); //hopefully
}
}
}
The first block of code should work fine. My guess is that the HandPointerGripEvent is hooked up ok, it just never fires.
How are you setting up your KinectRegion?
Are you updating the interration library each frame?
Perhaps this helps?
Kinect SDK 1.7: Mapping Joint/Cursor Coordinates to screen Resolution
KinectRegion.AddHandPointerGripHandler(this.Button1, this.Button1_Click);
Here Button1 is:
< k:KinectTileButton x:Name="Button1" Height="150" Width="150" Content="Click"/ >
The namespaces:
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:k="http://schemas.microsoft.com/kinect/2013"
Button1_Click is the method itself, for example:
private void Button1_Click(object sender, RoutedEventArgs e)
{
MessageBox.Show("YOU GOT ME !!!");
}
If you want to add a grip handler for another interface object, you just do:
KinectRegion.AddHandPointerGripHandler(< object name >, < method name >);
And s.o.
This is quite straight forward(ish) to do is the event is 'real' as in now created by DynamicProxy, but I can't work anything out for a mocked event.
The best way to explain what I'm trying to achieve is with code, please see the comment lines in the test method:
using System;
using Moq;
using NUnit.Framework;
namespace MOQTest
{
[TestFixture]
public class EventsMoqTest
{
[Test]
public void DetachTest()
{
var hasEventMock = new Mock<IHasEvent>();
using (var observer = new Observer(hasEventMock.Object))
{
//Assert that hasEventMock.Object has handler attached
}
//Assert that hasEventMock.Object DOES NOT have handler attached
}
}
public interface IHasEvent
{
event EventHandler AnEvent;
}
public class Observer : IDisposable
{
private readonly IHasEvent _hasEvent;
private readonly EventHandler _hasEventOnAnEvent;
public Observer(IHasEvent hasEvent)
{
_hasEvent = hasEvent;
_hasEventOnAnEvent = _hasEvent_AnEvent;
_hasEvent.AnEvent += _hasEventOnAnEvent;
}
void _hasEvent_AnEvent(object sender, EventArgs e)
{}
public void Dispose()
{
_hasEvent.AnEvent -= _hasEventOnAnEvent;
}
}
}
Unfortunately, you can't. This isn't really a moq issue, but the way the C# event keyword works with delegates. See this SO answer for more information.
public class SyncHelper
{
private LiveConnectClient client;
public event EventHandler SyncStarted;
public event EventHandler SyncCompleted;
public SyncHelper(LiveConnectClient client)
{
this.client = client;
}
public void TrySync()
{
Debug.WriteLine("Beginning sync");
OnSyncStarted();
client.GetCompleted += OnGetCompleted;
client.GetAsync("me/skydrive/files");
}
private void OnGetCompleted(object sender, LiveOperationCompletedEventArgs e)
{
Thread.Sleep(10000);
Debug.WriteLine("Get Completed");
client.GetCompleted -= OnGetCompleted;
OnSyncCompleted();
Debug.WriteLine("Sync completed");
}
private void OnSyncStarted()
{
if (SyncStarted != null)
SyncStarted(this, new EventArgs());
}
private void OnSyncCompleted()
{
if (SyncCompleted != null)
SyncCompleted(this, new EventArgs());
}
}
The function OnGetCompleted is being called in the UI thread and the UI is unresponsive. From whatever I know, I thought these callbacks would work in a different thread and we would have to use the displatcher to post it to the UI thread. Any thoughts? Help!
The GetAsync call is likely using a background thread to do the actual fetch, but then it's trying to help you by calling the Completed callback in the original thread context so you don't have to use a Dispatcher.
Why are you putting in a Sleep(10000) anyway? The callback says "hey, I'm done". At that point you should update the UI if you want. If you need to do further processing that takes significant time, spawn a background thread, threadpool task or use another asynchronous call with another callback.