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VBScript Examples

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(VBScript) Wait for Async Method to Complete

Demonstrates using the Wait method to wait for an asynchronous method to complete. This example will do an SFTP upload (over SSH) and will use the Async version of each method. Obviously, waiting for the async method to complete is the same as making a synchronous call, but an application wouldn't typically do this. An application might, for example, do other things as a background task is running, and then later wait for the task to complete.

Chilkat ActiveX Downloads

ActiveX for 32-bit and 64-bit Windows

Dim fso, outFile
Set fso = CreateObject("Scripting.FileSystemObject")
Set outFile = fso.CreateTextFile("output.txt", True)

' All Chilkat classes can be unlocked at once at the beginning of a program
' by calling UnlockBundle.  It requires a Bundle unlock code.
set chilkatGlob = CreateObject("Chilkat_9_5_0.Global")
success = chilkatGlob.UnlockBundle("Anything for 30-day trial.")
If (success <> 1) Then
    outFile.WriteLine(chilkatGlob.LastErrorText)
    WScript.Quit
End If

set sftp = CreateObject("Chilkat_9_5_0.SFtp")

' Set some timeouts, in milliseconds:
sftp.ConnectTimeoutMs = 15000
sftp.IdleTimeoutMs = 15000
waitMaxMs = 30000

' Connect to the SSH server.  
' The standard SSH port = 22
' The hostname may be a hostname or IP address.
port = 22
hostname = "www.my-ssh-server.com"

' task is a Chilkat_9_5_0.Task
Set task = sftp.ConnectAsync(hostname,port)
If (sftp.LastMethodSuccess = 0) Then
    outFile.WriteLine(sftp.LastErrorText)
    WScript.Quit
End If

' Start the background task.
success = task.Run()
If (Not success) Then
    outFile.WriteLine(task.LastErrorText)
End If

' Wait for the connect task to finish.
' The 1/0 returned by Wait applies to the Wait method call, not the task.
success = task.Wait(waitMaxMs)
If (Not success Or (task.StatusInt <> 7) Or (task.TaskSuccess <> 1)) Then
    If (Not success) Then
        ' The task.LastErrorText applies to the Wait method call.
        outFile.WriteLine(task.LastErrorText)
    Else
        ' The ResultErrorText applies to the underlying task method call (i.e. the Connect)
        outFile.WriteLine(task.Status)
        outFile.WriteLine(task.ResultErrorText)
    End If

    WScript.Quit
End If

' Authenticate with the SSH server.  Chilkat SFTP supports
' both password-based authenication as well as public-key
' authentication.  This example uses password authenication.
' task is a Chilkat_9_5_0.Task
Set task = sftp.AuthenticatePwAsync("myLogin","myPassword")
' To keep the example short, we'll skip handling failures.
' The failures would be handled in the same way as shown above.

success = task.Run()
success = task.Wait(waitMaxMs)

' After authenticating, the SFTP subsystem must be initialized:
' task is a Chilkat_9_5_0.Task
Set task = sftp.InitializeSftpAsync()
success = task.Run()
success = task.Wait(waitMaxMs)

' Upload from the local file to the SSH server.
' Important -- the remote filepath is the 1st argument,
' the local filepath is the 2nd argument;
remoteFilePath = "hamlet.xml"
localFilePath = "c:/temp/hamlet.xml"

' task is a Chilkat_9_5_0.Task
Set task = sftp.UploadFileByNameAsync(remoteFilePath,localFilePath)
If (sftp.LastMethodSuccess = 0) Then
    outFile.WriteLine(sftp.LastErrorText)
    WScript.Quit
End If

success = task.Run()
success = task.Wait(waitMaxMs)
If (Not success Or (task.StatusInt <> 7) Or (task.TaskSuccess <> 1)) Then
    If (Not success) Then
        ' The task.LastErrorText applies to the Wait method call.
        outFile.WriteLine(task.LastErrorText)
    Else
        ' The ResultErrorText applies to the underlying task method call (i.e. the Connect)
        outFile.WriteLine(task.Status)
        outFile.WriteLine(task.ResultErrorText)
    End If

    WScript.Quit
End If

outFile.WriteLine("File uploaded.")

outFile.Close

 

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