On Error

Error handling. For scripts designed to run against multiple computers or printers it is important to including error handling in case the remote machine is off-line.

Syntax 
      On Error resume next    - Enable error handling

      On Error goto 0         - Disable error handling

Error properties:

   err.Number (default)
   err.Source
   err.Description

Examples

In the examples below - replace the 'code goes here' line with your VBScript commands.

Example 1) Trap an error

On Error Resume Next
' code goes here
If Err.Number <> 0 Then
    'error handling:
    WScript.Echo Err.Number & " Srce: " & Err.Source & " Desc: " &  Err.Description
    Err.Clear
End If

Example 2) Trap an error or success

On Error Resume Next
' code goes here
If Err.Number = 0 Then
    WScript.Echo "It worked!"
Else
    WScript.Echo "Error:"
    WScript.Echo Err.Number & " Srce: " & Err.Source & " Desc: " &  Err.Description
    Err.Clear
End If

Example 3) Trap an error

On Error Resume Next
' code goes here
If Err.Number <> 0 Then ShowError("It failed")


Sub ShowError(strMessage)
    WScript.Echo strMessage
    WScript.Echo Err.Number & " Srce: " & Err.Source & " Desc: " &  Err.Description
    Err.Clear
End Sub

“Success is falling nine times and getting up ten” ~ Jon Bon Jovi

Related:

Syntax - error codes
InputBox - Prompt for user input
Equivalent in PowerShell: ErrorAction and $errorActionPreference