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    <h2> Handling Errors </h2> <p>A sort of an "older style" of error handling is available to us in VBScript, that does make use of <code>On Error Resume Next</code>. First we enable that (often at the top of a file; but you may use it <em>in place of</em> the first <code>Err.Clear</code> below for their combined effect), then before running our possibly-error-generating code, clear any errors that have already occurred, run the possibly-error-generating code, and then explicitly check for errors:</p> <pre><code>On Error Resume Next ' ... ' Other Code Here (that may have raised an Error) ' ... Err.Clear ' Clear any possible Error that previous code raised Set myObj = CreateObject("SomeKindOfClassThatDoesNotExist") If Err.Number &lt;&gt; 0 Then WScript.Echo "Error: " &amp; Err.Number WScript.Echo "Error (Hex): " &amp; Hex(Err.Number) WScript.Echo "Source: " &amp; Err.Source WScript.Echo "Description: " &amp; Err.Description Err.Clear ' Clear the Error End If On Error Goto 0 ' Don't resume on Error WScript.Echo "This text will always print." </code></pre> <p>Above, we're just printing out the error if it occurred. If the error was fatal to the script, you could replace the second <code>Err.clear</code> with <code>WScript.Quit(Err.Number)</code>.</p> <p>Also note the <code>On Error Goto 0</code> which turns off resuming execution at the next statement when an error occurs.</p> <p>If you want to test behavior for when the <code>Set</code> succeeds, go ahead and comment that line out, or create an object that will succeed, such as <code>vbscript.regexp</code>.</p> <p>The <code>On Error</code> directive only affects the current running scope (current <code>Sub</code> or <code>Function</code>) and does not affect calling or called scopes.</p> <hr> <h2> Raising Errors </h2> <p>If you want to check some sort of state and then raise an error to be handled by code that calls your function, you would use <code>Err.Raise</code>. <code>Err.Raise</code> takes up to five arguments, <code>Number</code>, <code>Source</code>, <code>Description</code>, <code>HelpFile</code>, and <code>HelpContext</code>. Using help files and contexts is beyond the scope of this text. <code>Number</code> is an error number you choose, <code>Source</code> is the name of your application/class/object/property that is raising the error, and <code>Description</code> is a short description of the error that occurred.</p> <pre><code>If MyValue &lt;&gt; 42 Then Err.Raise(42, "HitchhikerMatrix", "There is no spoon!") End If </code></pre> <p>You could then handle the raised error as discussed above.</p> <hr> <p><sub><strong>Change Log</strong></sub> <li><sub>Edit #1: Added an <code>Err.Clear</code> before the possibly error causing line to clear any previous errors that may have been ignored. </sub></li> <li><sub>Edit #2: Clarified.</sub></li> <li><sub>Edit #3: Added comments in code block. Clarified that there was expected to be more code between <code>On Error Resume Next</code> and <code>Err.Clear</code>. Fixed some grammar to be less awkward. Added info on <code>Err.Raise</code>. Formatting. </sub></li></p>
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