(VB.NET) Understanding Async Function Return Values

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Explains how to get the return value of the function called synchonously in the background thread.

Chilkat .NET Downloads Chilkat .NET Framework Chilkat for .NET Core

' Some Chilkat functions can be called asynchronously.
' If a function "Func" can be called asynchronously, there will be a corresponding "FuncAsync" function that returns a Task object.
' 
' When Task.Run is called, the synchronous "Func" runs in a background thread.
' 



' For Chilkat methods that return a status (True/False), get returned value by calling GetResultBool.
' For example..

Dim sock As New Chilkat.Socket

' --------------------------------------------------------------
' Synchronous call returning True/False
Dim success As Boolean = sock.Connect("example.com",443,True,5000)

' --------------------------------------------------------------
' Asynchronous call
Dim task As Chilkat.Task = sock.ConnectAsync("example.com",443,True,5000)
' ...
task.Run()
' ...
' ...
' Get the status (True/False) value returned by the synchronous method called in the background thread.
success = task.GetResultBool()

' --------------------------------------------------------------
' Synchronous call returning an integer
Dim count As Integer = sock.ReceiveCount()

' --------------------------------------------------------------
' Asynchronous call
task = sock.ReceiveCountAsync()
' ...
task.Run()
' ...
' ...
' Get the integer value returned by the synchronous method called in the background thread.
count = task.GetResultInt()

' --------------------------------------------------------------
' Synchronous call returning an string
Dim s As String = sock.ReceiveString()

' --------------------------------------------------------------
' Asynchronous call
task = sock.ReceiveStringAsync()
' ...
task.Run()
' ...
' ...
' Get the string value returned by the synchronous method called in the background thread.
s = task.GetResultString()


' --------------------------------------------------------------
' Synchronous call returning an object
Dim connection As Chilkat.Socket = sock.AcceptNextConnection(5000)

' --------------------------------------------------------------
' Asynchronous call
task = sock.AcceptNextConnectionAsync()
' ...
task.Run()
' ...
' ...
' Get the object returned by the synchronous method called in the background thread.
' We do this a little differently.  We create an new object of the same type,
' and then load it with the returned object (assuming it was not null).
Dim acceptedConnection As New Chilkat.Socket
If (task.TaskSuccess = True) Then
    success = acceptedConnection.LoadTaskResult(task)
End If