I'm curious about this.
Did you figure it out.
I get the same error.
Without the OnPreviewClose it works.


>I receive the error 'Error Loading Printer Driver' when using the custom Report Listener in PREVIEW mode and the user clicks the print button on the preview toolbar.
>
>The error does not occur when using the standard VFP preview mode or when printing directly.
>
>The code I am testing (listed below) is a sample from fox.wikis.com. I created a very simple report form called test.frx without saving the printer environment for use by the example.

>
>CREATE CURSOR test (cdata char(20))
>APPEND blank
>*Modeled after sample code at http://fox.wikis.com/wc.dll?Wiki~ReportListener~VFP
>*...
>*Code to instantiate the listener object and run the report.
>#INCLUDE reportlisteners.h
>Set Classlib To Home()+"\ffc\_reportlistener.vcx" additive
>
>#DEFINE DebugListener -2
>#DEFINE PrintListener 0
>#DEFINE PreviewListener 1
>#DEFINE XMLListener 4
>#DEFINE HTMLListener 5
>
>#DEFINE PreviewMode '1'
>#DEFINE PrintMode '2'
>
>**Custom Listener
>Local oListener as object
>oListener = NEWOBJECT("ltListener")
>oListener.ListenerType = PreviewListener
>
>***Run Report
>REPORT FORM "test.frx" TO PRINTER PROMPT OBJECT olistener
>
>RETURN
>
>*+------------------------------------------------------
>*| Custom Listener Class named: "ltListener"
>*+------------------------------------------------------
>DEFINE CLASS ltListener AS utilityreportlistener
>************* Instance Specific Properties
>
>	*+---------------------------------------------------------
>	*| *** Parent Method Customizations ***
>	*+---------------------------------------------------------
>	*+---------------------------------------------------------
>	*| Error() **Inherited Method
>	*| Triggered when an Error occurs while running the report.
>	*+---------------------------------------------------------
>	Procedure Error(nError, cMethod, nLine)
>		DoDefault(nError, cMethod, nLine)
>		Set Step On
>	ENDPROC
>
>	*+---------------------------------------------------------
>	*| OnPreviewClose() **Inherited Method
>	*| Triggered when an Error occurs while running the report.
>	*+---------------------------------------------------------
>	Procedure OnPreviewClose(lPrint)
>		IF lPrint	&& User clicked Print button!
>			*** Set variable flag here, or whatever
>			WAIT WINDOW "It's rollin', baby!"
>		ENDIF
>		DoDefault(lPrint)
>	ENDPROC
>ENDDEFINE