Similarly to printing, when users click the “Export” button in the previewer toolbar (), the Export method of the XFCont class is called. This method displays a dialog box with output type and a file name selection and converts the XFF file that is being previewed to the output document:

If you would like to create your own custom exporting solution, you can either setup an extension handler (please see Registering an extension handler paragraph above in this chapter for more information) or you can create a child of the XFCont class and override the Export method. There are five events that extension handler can implement:

Name	Description
BeforeSetParams	The method is executed right before calls SetParams() method and can be used to parametrize the xfrx session object before exporting.
BeforeExport	The method is executed right before the report is exported to the output format and can be used to parametrize the xfrx session object before exporting.
AfterExport	The method is executed right after the report is exported to the output format and can be used to copy output file to another folder.
Export	This method is called when the Export button is clicked in the toolbar.
BeforeExportOptions	This method is called before the Export Options dialog is opened.
ExportOptions	This method is called after the Export Options dialog is closed, before the actual Export is executed

The export parameter object has the following properties:

Name	Type	Description
cTarget	string	XFRX output type.
cPageScope	string	Enter page numbers and/or page ranges separated by commas (e.g. 3,4,5-9).
cOutputFile	string	Output file.
lNotOpenFile	boolean	Specifies whether a XFRX open file after creating.
lShowDialog	boolean	Specifies whether a XFRX call "Print options" dialog.
lExport	boolean	Specifies whether a XFRX export to output.

AllOddEven	number	Include all pages, odd or even only.
Copies	number	The number of copies.
Zoom	number	The number of pages per sheet.
ImageDPI	number	Image DPI.
aFindString	array	A array contains strings for highlight. The array can has one column - than background color will be yelow for all strings. Or cab has two columns - than second column contains background color for string.

nAppendMode	number	Append mode for PDF, RTF, FRTF and PLAIN.
nAMFromPage	number	For nAppendMode 4 - The generated report will be inserted to the existing document at the given page number. For nAppendMode 5 - first page for replacing in original document.
nAMToPage	number	For nAppendMode 5 - last page for replacing in original document.

cArchive	string	Archive (zip) file name.
lArchiveAdditive	boolean	Append to archive.
lArchiveDeleteFileAfter	boolean	Delete file(s) after creating archive.

oWM	object	Watermark object.
oEffect	object	Effect object

Extension handler examples

Example 1: Defining the export output options list, intercepting the XLS export

USE invoices
ORDER customer
LOCAL m.loSession, m.lnRetval, m.loXFF, m.loPreview, m.loScripts
m.loSession=EVALUATE([xfrx("XFRX#LISTENER")])
m.lnRetVal = m.loSession.SetParams("",,,,,,"XFF") && no name = just in memory
IF m.lnRetVal = 0
   REPORT FORM invoices OBJECT m.loSession
   m.loXFF = m.loSession.oxfDocument
   *
   * initialize the previewer
   * SET CLASSLIB TO xfrxlib ADDITIVE
   m.loPreview = CREATEOBJECT("frmMPPreviewer")
   m.loPreview.setExtensionHandler(CREATEOBJECT("MyExtensionHandler"))
   m.loPreview.windowType = 0
   m.loPreview.iBook = 0
   m.loPreview.PreviewXFF(loXFF)
   m.loPreview.show(1)
ENDIF


DEFINE CLASS MyExtensionHandler AS Custom
   PROCEDURE Export
      LPARAMETERS m.toXFF
      IF USED("_xfExportTypes")
         USE IN _xfExportTypes
      ENDIF
      *
      * define my export options list
      * CREATE CURSOR _xfExportTypes (name C(50), extension C(4), targetCode C(10))
      INSERT INTO _xfExportTypes VALUES ("HTML", "html", "HTML")
      INSERT INTO _xfExportTypes VALUES ("PDF", "pdf", "PDF")
      INSERT INTO _xfExportTypes VALUES ("Excel", "xls", "XLS")
   ENDPROC


   PROCEDURE ExportOptions
      LPARAMETERS m.toXFF, m.toOptions
      IF m.toOptions.cTarget = "XLS"
         *
         * my own code to handle output to Excel
         * =MESSAGEBOX("exporting to "+m.toOptions.cOutputFile)
         RETURN .F. && suppress the default behavior
      ELSE
         RETURN .T. && continue with the default behavior
      ENDIF
   ENDPROC

ENDDEFINE

Example 2

SET PATH TO xfrxlib
SET CLASSLIB TO xfrxlib
 
LOCAL m.loPreview, m.loSession, m.loExtensionHandler
m.loExtensionHandler = CREATEOBJECT("myExtensionHandler")
m.loPreview = CREATEOBJECT("frmMPPreviewer")
m.loSession=EVALUATE([xfrx("XFRX#LISTENER")])

*
* create a memory XFF file
*

m.lnRetVal = m.loSession.SetParams(,,,,,,"XFF")
IF m.lnRetVal = 0
   SELECT * ;
     FROM customers INNER JOIN orders ON customers.customerid = orders.customerid ;
                    INNER JOIN orderdetails ON orders.orderid = orderdetails.orderid ;
     ORDER BY customers.companyname, customers.customerID, orders.orderID ;
     INTO CURSOR custlist
         
   REPORT FORM custlist OBJECT loSession
ENDIF

*
* assign the extension handler
*

m.loPreview.setExtensionHandler(loExtensionHandler)
*
* preview the report
*
m.loPreview.previewXFF(m.loSession.oxfdocument)
m.loPreview.show(1)
  
DEFINE CLASS myExtensionHandler AS CUSTOM
   PROCEDURE Print
      LPARAMETERS m.toXFF
      RETURN .T. && continue with the default behavior
   ENDPROC

   PROCEDURE Export
      LPARAMETERS m.toXFF
      *
      * now you can process the XFF file
      *
      RETURN .F. && override the default behavior
   ENDPROC
ENDDEFINE

BeforeExport & AfterExport Example

USE demoreps\invoices ORDER customer
LOCAL m.loSession, m.lnRetval, m.loXFF, m.loPreview, m.loScripts
m.loSession=EVALUATE([xfrx("XFRX#LISTENER")])
m.lnRetVal = m.loSession.SetParams(,,,,,,"XFF") && no name = just in memory
IF m.lnRetVal = 0
   REPORT FORM demoreps\invoices object m.loSession
   *
   * the XFRX#DRAW object reference is stored in oxfDocument property
   *
   m.loXFF = m.loSession.oxfDocument
   *
   * initialize the previewer
   *
   SET PATH TO xfrxlib
   SET CLASSLIB TO xfrxlib ADDITIVE
   m.loPreview = CREATEOBJECT("frmMPPreviewer")
   *
   * setup the extension handler
   *
   m.loPreview.oExtensionHandler = CREATEOBJECT("SampleExtensionHandler")
   m.loPreview.windowtype = 1
   m.loPreview.iTool = 2 && embedded toolbar
   m.loPreview.PreviewXFF(m.loXFF)
   m.loPreview.show(1)
ENDIF

 

DEFINE CLASS SampleExtensionHandler as Custom
   PROCEDURE BeforeExport
      LPARAMETERS m.toSession, m.toExportParameters
      m.toSession.setAuthor("Martin") && set the document author property
      IF m.toExportParameters.cTarget = "XLS" && (XLS or XLSPLAIN)
         m.toSession.SetOtherParams("DISPLAY_GRID_LINES",.F.) && do not display gridlines in excel
      ENDIF
   ENDPROC

   PROCEDURE AfterExport
      LPARAMETERS m.toSession, m.toOptions
      IF m.toOptions.cTarget = "XLS"
         *COPY FILE (m.toOptions.coutputfile) TO ([anybackupfolder]\[anyfile.xls])
      ENDIF
   ENDPROC

ENDDEFINE

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