Visual Basic 6.0

Understanding Async Function Return Values

See more Async Examples

Explains how to get the return value of the function called synchonously in the background thread. Visual Basic 6.0

Dim success As Long
success = 0

' 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 (1/0), get returned value by calling GetResultBool.
' For example..

Dim sock As New ChilkatSocket

' --------------------------------------------------------------
' Synchronous call returning 1/0
success = sock.Connect("example.com",443,1,5000)

' --------------------------------------------------------------
' Asynchronous call
Dim task As ChilkatTask
Set task = sock.ConnectAsync("example.com",443,1,5000)
' ...
success = task.Run()
' ...
' ...
' Get the status (1/0) value returned by the synchronous method called in the background thread.
success = task.GetResultBool()

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

' --------------------------------------------------------------
' Asynchronous call
Set task = sock.ReceiveCountAsync()
' ...
success = 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
s = sock.ReceiveString()

' --------------------------------------------------------------
' Asynchronous call
Set task = sock.ReceiveStringAsync()
' ...
success = 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 ChilkatSocket
Set connection = sock.AcceptNextConnection(5000)

' --------------------------------------------------------------
' Asynchronous call
Set task = sock.AcceptNextConnectionAsync()
' ...
success = 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 ChilkatSocket
If (task.TaskSuccess = 1) Then
    success = acceptedConnection.LoadTaskResult(task)
End If