On [Local] Error Goto label

On [Local] Error Goto label

label

On Error triggers a jump to an error handler when an error occurs.

If Local is not used the handler must be in the main part of the module. Using Local allows to have the error handler inside the Sub/Function where the On Error is located.

On Error GOTO 0 deactivates the current error handler.

The use of QB-like error handling requires compilation with switch -e, -ex or -exx activated.

See Runtime Error Codes for a listing of runtime error numbers and their associated meaning.

'' Compile with QB (-lang qb) dialect

'$lang: "qb"

On Error Goto errorhandler
Error 24 '' simulate an error
Print "this message will not be seen"

errorhandler:
Print "Error #"; Err; "!"
End

• ON ERROR is supported in the -lang qb dialect only. In the -lang fb dialect, statements can be used in function form to return an error code
  

'' Compile with FB default (-lang fb) dialect 
If Open( "text" For Input As #1 ) <> 0 Then
  Print "Unable to open file"
End If

• QB has no LOCAL clause and requires the label to be in the main part of the module.
  
  

• Error
  
• Local
  
• Err
  
• Runtime Error Codes