Throw an error in vbscript

error handlingvbscript

I'm used to programing in C#, which obviously has some pretty robust error handling. Now I'm working on a short project in VBScript. I've read about the error handling with VBscript using "On Error _______" and the Err global variable.

However, is there some way I can generate my own errors? For example if one of my functions is passed the wrong type of parameter I'd rather my script just flat out fail at that point then try to continue.

Best Answer

Yes, you can. Use the Err.Raise method, e.g.:

Err.Raise 5 ' Invalid procedure call or argument

For a list of VBScript's standard error codes, see Errors (VBScript).

Related Solutions

VBScript conditional short-circuiting workaround

Nested IFs (only slightly less verbose):

if not isNull(Rs("myField")) Then
   if Rs("myField") <> 0 then

VBScript — Using error handling

VBScript has no notion of throwing or catching exceptions, but the runtime provides a global Err object that contains the results of the last operation performed. You have to explicitly check whether the Err.Number property is non-zero after each operation.

On Error Resume Next

DoStep1

If Err.Number <> 0 Then
  WScript.Echo "Error in DoStep1: " & Err.Description
  Err.Clear
End If

DoStep2

If Err.Number <> 0 Then
  WScript.Echo "Error in DoStop2:" & Err.Description
  Err.Clear
End If

'If you no longer want to continue following an error after that block's completed,
'call this.
On Error Goto 0

The "On Error Goto [label]" syntax is supported by Visual Basic and Visual Basic for Applications (VBA), but VBScript doesn't support this language feature so you have to use On Error Resume Next as described above.

Best Answer

Related Solutions

VBScript conditional short-circuiting workaround

VBScript — Using error handling

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