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Like any delegate, AsyncCallback can only invoke methods that match a specific pattern, which in this case is a method taking IAsyncResult as the sole parameter and returning nothing: Sub MyAsyncCallbackMethod(ByVal itfAR As IAsyncResult) Assume you have another application making use of the BinaryOp delegate. This time, however, you will not poll the delegate to determine whether the Add() method has completed. Rather, you will define a shared method named AddComplete() to receive the notification that the asynchronous invocation is finished: Imports System.Threading ' Our delegate. Public Delegate Function BinaryOp(ByVal x As Integer, _ ByVal y As Integer) As Integer Module Program Sub Main() Console.WriteLine("***** Console.WriteLine()

Figure 3 12. When filling out a web form in Mobile Safari, the keyboard includes an input accessory view, which is a toolbar-like interface added to the top of the keyboard.

AsyncCallbackDelegate Example *****")

s If you want to get a better understanding of what this interface can do for you, just implement it in Tip

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Console.WriteLine("Main() invoked on thread {0}.", _ Thread.CurrentThread.GetHashCode()) Dim b As BinaryOp = New BinaryOp(AddressOf Add) Dim itfAR As IAsyncResult = _ b.BeginInvoke(10, 10, New AsyncCallback(AddressOf AddComplete), _ Nothing) ' Other work performed here... Console.ReadLine() End Sub Sub AddComplete(ByVal itfAR As IAsyncResult) Console.WriteLine("AddComplete() invoked on thread {0}.", _ Thread.CurrentThread.GetHashCode()) Console.WriteLine("Your addition is complete") End Sub Function Add(ByVal x As Integer, ByVal y As Integer) As Integer Console.WriteLine("Add() invoked on thread {0}.", _ Thread.CurrentThread.GetHashCode()) Thread.Sleep(5000) Return x + y End Function End Module Again, the shared AddComplete() method will be invoked by the AsyncCallback delegate when the Add() method has completed. If you run this program, you can confirm that the secondary thread is the thread invoking the AddComplete() callback, as shown in Figure 16-3.

You may have noticed in the current example that the Main() method is not caching the IAsyncResult type returned from BeginInvoke() and is no longer calling EndInvoke(). The reason is that the target of the AsyncCallback delegate (AddComplete() in this example) does not have access to the original BinaryOp delegate created in the scope of Main(). While you could simply declare the BinaryOp variable as a shared member of the module to allow both methods to access the same object, a more elegant solution is to use the incoming IAsyncResult parameter. The incoming IAsyncResult parameter passed into the target of the AsyncCallback delegate is actually an instance of the AsyncResult class (note the lack of an I prefix, which identifies interface types) defined in the System.Runtime.Remoting.Messaging namespace. The shared AsyncDelegate property returns a reference to the original asynchronous delegate that was created elsewhere. Therefore, if you wish to obtain a reference to the BinaryOp delegate object allocated within Main(), simply cast the System.Object returned by the AsyncDelegate property into type BinaryOp. At this point, you can trigger EndInvoke() as expected: ' Don't forget to Import the ' System.Runtime.Remoting.Messaging namespace! Sub AddComplete(ByVal itfAR As IAsyncResult) Console.WriteLine("AddComplete() invoked on thread {0}.", _ Thread.CurrentThread.GetHashCode) Console.WriteLine("Your addition is complete") ' Now get the result. Dim ar As AsyncResult = CType(itfAR, AsyncResult) Dim b As BinaryOp = CType(ar.AsyncDelegate, BinaryOp) Console.WriteLine("10 + 10 is {0}.", b.EndInvoke(itfAR)) End Sub

your service and set a breakpoint in the body of your method. Then you can inspect the passed parameters and get a better understanding of what you can influence.

Programming your app to utilize a custom keyboard layout or input accessory view can be somewhat complicated, but 9 takes you step by step through the process with helpful sample projects.

The final aspect of asynchronous delegates we need to address is the final argument to the BeginInvoke() method (which has been Nothing up to this point). This parameter allows you to pass additional state information to the callback method from the primary thread. Because this argument is prototyped as a System.Object, you can pass in any type of data whatsoever, as long as the callback method knows what to expect. Assume for the sake of demonstration that the primary thread wishes to pass in a custom text message to the AddComplete() method:

Sub Main() ... Dim b As BinaryOp = New BinaryOp(AddressOf Add) Dim itfAR As IAsyncResult = _ b.BeginInvoke(10, 10, New AsyncCallback(AddressOf AddComplete), _ "Main() thanks you for adding these numbers.") ' Other work performed here... Console.ReadLine() End Sub To obtain this data within the scope of AddComplete(), make use of the AsyncState property of the incoming IAsyncResult parameter: Sub AddComplete(ByVal itfAR As IAsyncResult) ... ' Retrieve the informational object and cast it to string Dim msg As String = CType(itfAR.AsyncState, String) Console.WriteLine(msg) End Sub Figure 16-4 shows the output of the current application.

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