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Handling Errors in VBScript

  • Artikkeli

There is little difference between the methods used in Visual Basic and those used with VBScript. The primary difference is that VBScript does not support the concept of error handling by continuing execution at a label. In other words, you cannot use On Error GoTo in VBScript. Instead, use On Error Resume Next and then check both Err.Number and the Count property of the Errors collection, as shown in the following example:

<!-- BeginErrorExampleVBS -->  
<HTML>  
<HEAD>  
<META NAME="GENERATOR" Content="Microsoft Visual Studio 6.0">  
<TITLE>Error Handling Example (VBScript)</TITLE>  
</HEAD>  
<BODY>  
  
<h1>Error Handling Example (VBScript)</h1>  
  
<%  
  
   Dim cnn1  
   Dim errLoop  
   Dim strError  
  
   On Error Resume Next  
  
   ' Intentionally trigger an error.  
   Set cnn1 = Server.CreateObject("ADODB.Connection")  
   cnn1.Open "nothing"  
  
   If cnn1.Errors.Count > 0 Then  
      ' Enumerate Errors collection and display  
      ' properties of each Error object.  
      For Each errLoop In cnn1.Errors  
         strError = "Error #" & errLoop.Number & "<br>" & _  
            "   " & errLoop.Description & "<br>" & _  
            "   (Source: " & errLoop.Source & ")" & "<br>" & _  
            "   (SQL State: " & errLoop.SQLState & ")" & "<br>" & _  
            "   (NativeError: " & errLoop.NativeError & ")" & "<br>"  
         If errLoop.HelpFile = "" Then  
            strError = strError & _  
               "   No Help file available" & _  
               "<br><br>"  
         Else  
            strError = strError & _  
               "   (HelpFile: " & errLoop.HelpFile & ")" & "<br>" & _  
               "   (HelpContext: " & errLoop.HelpContext & ")" & _  
               "<br><br>"  
         End If  
  
         Response.Write("<p>" & strError & "</p>")  
      Next  
   End If  
  
%>  
  
</BODY>  
</HTML>  
<!-- EndErrorExampleVBS -->