B4J Question Update display while code is executing

[Paul.Johnson]

(warning: new B4J user!)
I've just started working with B4J. I have a simple routine that creates a batch file based on some parameters and inputs, then executes the batch file. After completion, other actions are available to the user.

        Label1.Text="please wait: executing external process..."
        lst.Initialize
        lst.add(":: first line of batch file")
        lst.add(":: second line of batch file")
        lst.add(":: and so on...")

        File.WriteList(pathStore,"c:\tempBatchFile.bat",lst)
        lst.Clear
        lst.Add("/c")
        lst.Add("""c:\tempBatchFile.bat""")
        Dim sh As Shell
        sh.Initialize("test","cmd.exe",lst)
        sh.RunSynchronous(-1)
     
        Label1.Text=tStr & " pull executed"

The process works great, but the batch file requires several seconds to execute, and there is no indication to the user that the process has started.
I have a label that I intended to use to show status (Label1), but the UI is not updated until the process has been completed. How can I display an updated label that is visible while the batch process is running? Similarly, can I change the mouse cursor during execution? With VBA I could use 'DoEvents' and/or Repaint to tell the application to update the display before proceeding, but have not discovered how to accomplish that with B4J.

 

[Erel]

Never use Shell.RunSynchronous in a UI application. It will freeze your app until the process exits.

Correct code:

sh.Run(-1)
Wait For test_ProcessCompleted (Success As Boolean, ExitCode As Int, StdOut As String, StdErr As String)
Log("Done")
If Success And ExitCode = 0 Then
Log("Success")
End If

Search for resumable subs to learn more about Wait For.

 

[Paul.Johnson]

Exactly what I needed. Thanks for pointing me in the right direction!