What does the On Error Resume Next statement do

Question

I came to some VBScript examples  and I saw the statement On Error Resume Next basically at the beginning of the script   What does it do

User · Answer

It means  when an error happens on the line  it is telling vbscript to continue execution without aborting the script  Sometimes  the On Error follows the Goto label to alter the flow of execution  something like this in a Sub code block  now you know why and how the usage of GOTO can result in spaghetti code    Sub MySubRoutine      On Error Goto ErrorHandler     REM VB code        REM More VB Code     Exit MySubRoutine      REM Disable the Error Handler      On Error Goto 0     REM Leave        Exit Sub  ErrorHandler      REM Do something about the Error     Goto Exit MySubRoutine End Sub

User · Answer

On Error Statement  - Specifies that when a run-time error occurs  control goes to the statement immediately following the statement  How ever Err object got populated  Err Number  Err Count etc

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It basically tells the program when you encounter an error just continue at the next line

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On Error Resume Next means that On Error  It will resume to the next line to resume   e g  if you try the Try block  That will stop the script if a error occurred

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It s worth noting that even when On Error Resume Next is in effect  the Err object is still populated when an error occurs  so you can still do C-style error handling   On Error Resume Next  DangerousOperationThatCouldCauseErrors  If Err Then     WScript StdErr WriteLine  error    amp  Err Number     WScript Quit 1 End If  On Error GoTo 0

User · Answer

It enables error handling  The following is partly from https   msdn microsoft com en-us library 5hsw66as aspx    Enable error handling  When a run-time error occurs  control goes to the statement    immediately following the statement where the error occurred  and execution   continues from that point  On Error Resume Next  SomeCodeHere  If Err Number   0 Then     WScript Echo  No Error in SomeCodeHere   Else   WScript Echo  Error in SomeCodeHere     amp  Err Number  amp        amp  Err Source  amp        amp  Err Description     Clear the error or you ll see it again when you test Err Number   Err Clear End If  SomeMoreCodeHere  If Err Number  lt  gt  0 Then   WScript Echo  Error in SomeMoreCodeHere    amp  Err Number  amp        amp  Err Source  amp        amp  Err Description     Clear the error or you ll see it again when you test Err Number   Err Clear End If    Disables enabled error handler in the current procedure and resets it to Nothing  On Error Goto 0    There are also  On Error Goto -1   which disables the enabled exception in the current    procedure and resets it to Nothing  and  On Error Goto line      which enables the error-handling routine that starts at the line specified in the    required line argument  The line argument is any line label or line number  If a run-time    error occurs  control branches to the specified line  making the error handler active     The specified line must be in the same procedure as the On Error statement     or a compile-time error will occur

User · Answer

When an error occurs  the execution will continue on the next line without interrupting the script

[vbscript] What does the "On Error Resume Next" statement do?

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