How To Convert FoxPro Cursor into XML Data Format

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Article ID: 191758 - View products that this article applies to.
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SUMMARY

This article describes how to create an Extensible Markup Language (XML) data file from a cursor in Visual FoxPro 6.0.

MORE INFORMATION

Extensible Markup Language (XML) is the universal format for data on the Web. XML is a text-based format that lets developers describe, deliver and exchange structured data between a range of applications to clients for local display and manipulation. XML does not replace HTML, rather, it is a complementary format.

To create an XML file from a filtered .dbf table follow these steps:
  1. Create a program (.prg) file named Callxml.prg and place the following code in the file:
    LOCAL lcFileName,lcXMLFile,lcFilter
    
    lcDBFName = HOME(2) + "data\orders.dbf"
    lcXMLFile = LOWER(SYS(2023)) + "\orders.xml"
    lcFilter = "FOR To_Region='WA'"
    
    STRTOFILE(DBF2XML(lcDBFName, lcFilter, .T.), ;
    lcXMLFile)
    MODIFY FILE (lcXMLFile) NOWAIT
    
    RETURN
    						
  2. Create another .prg file named Dbf2xml.prg, and put the following code into this .prg file:
    * Dbf2xml.prg
    
    *-- ASCII codes
    #DEFINE TAB     CHR(9)
    #DEFINE LF      CHR(10)
    #DEFINE CR      CHR(13)
    #DEFINE CR_LF   CR+LF
    
    LPARAMETERS tcTable, tcScope, tnTabIndents
    LOCAL lcTable, lcAlias, lcScope, lcDBFName, lcIndentText, lcDBF, lcRootName
    LOCAL lcValue, lcField, lnFieldCount, lnCount, lnLastSelect, lnLastRecNo
    LOCAL lcXMLText
    DIMENSION laFields[1]
    
    IF NOT INLIST(VARTYPE(tcTable), "C", "L") OR NOT ;
           INLIST(VARTYPE(tcScope), "C", "L")
       RETURN ""
    ENDIF
    
    lcIndentText = IIF(VARTYPE(tnTabIndents) == "N", ;
                       REPLICATE(TAB, tnTabIndents), "")
    lcTable = LOWER(IIF(EMPTY(tcTable), ALIAS(), ALLTRIM(tcTable)))
    lnLastSelect=SELECT()
    
    IF "." $ lcTable
       lcDBF = lcTable
       IF NOT FILE(lcDBF)
          RETURN ""
       ENDIF
       
       SELECT 0
       lcAlias = LOWER(SYS(2015))
       USE (lcDBF) ALIAS (lcAlias) AGAIN SHARED
       lcDBFName = LOWER(FORCEEXT(JUSTFNAME(DBF()), ""))
    ELSE
       lcDBF = ""
       lcAlias = lcTable
       lcDBFName = lcAlias
    ENDIF
    
    IF NOT USED(lcAlias)
       SELECT (lnLastSelect)
       RETURN ""
    ENDIF
    
    lcScope = IIF(EMPTY(tcScope), "ALL", ALLTRIM(tcScope))
    
    SELECT (lcAlias)
    
    lnLastRecNo = IIF(EOF(), 0, RECNO())
    lcXMLText = "<"+ lcDBFName + "_table>" + CR_LF
    
    lnFieldCount = AFIELDS(laFields)
    IF lnFieldCount = 0
       SELECT (lnLastSelect)
       RETURN ""
    ENDIF
    
    lcRootName = lcDBFName
    DO WHILE TYPE(lcRootName) != "U"
       lcRootName = lcRootName + "1"
    ENDDO
    
    SCAN &lcScope
       lcXMLText = lcXMLText + lcIndentText + ;
          "<" + lcRootName + ">" + CR_LF
          
       FOR lnCount = 1 TO lnFieldCount
          lcField = LOWER(laFields[lnCount, 1])
          lcValue = ALLTRIM(TRANSFORM(EVALUATE(lcField)))
          IF EMPTY(lcValue)
             LOOP
          ENDIF
          
          lcXMLText=lcXMLText + lcIndentText + TAB + ;
             "<" + lcField + ">" + lcValue + "</" + lcField + ">" + CR_LF
       ENDFOR
       
       lcXMLText = lcXMLText + lcIndentText + ;
          "</" + lcRootName + ">" + CR_LF
    ENDSCAN
    
    IF EMPTY(lcDBF)
       IF lnLastRecNo > 0
          GO lnLastRecNo
       ENDIF
    ELSE
        USE
    ENDIF
    
    SELECT (lnLastSelect)
    
    lcXMLText = lcXMLText + CR_LF + "</"+ lcDBFName + "_table>"
    
    RETURN lcXMLText
    					
  3. In the Visual FoxPro Command window, run the Callxml.prg file. This results in the creation of a file named Orders.xml, which is a text file subset of the Orders.dbf table. The program places the file in the folder pointed to by the operating system environment SET TEMP setting.

REFERENCES

For more information about XML, please see the following Microsoft Web site:
http://msdn.microsoft.com/xml/

Properties

Article ID: 191758 - Last Review: June 29, 2004 - Revision: 1.1
APPLIES TO
  • Microsoft Visual FoxPro 6.0 Professional Edition
Keywords: 
kbhowto KB191758
Retired KB Content Disclaimer
This article was written about products for which Microsoft no longer offers support. Therefore, this article is offered "as is" and will no longer be updated.

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