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Icetips Article



XML: MS-XML parser code
2004-04-24 -- Jim Kane
 
Newsgroups: comp.lang.clarion,softvelocity.clarion.language

> Has anyone had succes in using the following VB code in Clarion?
>
'---------------------------------------------------------------------------
> -------------------------------------------
>             Dim xmlDoc As MSXML2.DOMDocument
>             Dim ErrorState As Long
>             Dim ErrorString As String
>             Dim ErrorCode As Variant
>             Dim Desc As String
>
>
> '**** Load the xmldoc into the XML parser ****
>         Set xmlDoc = CreateObject("MSXML2.DOMDocument")
>         If Not xmlDoc.loadXML(sXMLDocument) Then
>            With xmlDoc.parseError
>               Desc = " File Pos = " & .filepos & ", Error Code = " &
> ..ErrorCode & ",Line = " & .Line & ", Line Pos = " & .linepos & ",
> Reason = " & .reason & ", Source = " & .srcText
>              Err.Raise 1011, Err.Source, Desc
>                   Exit Function
>                End With
>             End If
>
>
'---------------------------------------------------------------------------
> -------------------------------------------

Here is a literal translation with a few more details.
However if you try to use the clarion ole control for xml you are likely to
comit suicide before the project is over.
It would be much smarter to generate the interfaces and do it right.  I
wrote the code below a long time ago in c5b
then abandoned it and went early binding.
hence I lived.
Jim Kane

  program
  map
    parse(window, long,string, *string),byte
  end
parseerror string(500)
window WINDOW('Caption'),AT(,,260,100),GRAY,DOUBLE
       OLE,AT(74,27,100,71),USE(?Ole1)
       END
     END

  code
  open(window)
  0{prop:hide}=1
  accept
   case event()
   of event:openwindow
     ?ole1{prop:create}='msxml2.domdocument'
      if parse(window, ?ole1, 'something.xml', parseerror) then
            message(clip(parseerror),'XML error')
            post(event:closewindow)
            cycle
      else
          Message('No error')
          post(event:closewindow)
          cycle
      end
   end
  end
  close(window)

parse                  Procedure(window pW, long pfeq, string pFilename,
*string pErrorstr)
cParseError cstring(20)
res  byte
vbtrue equate(-1)
vbfalse equate(0)
  Code

  pW $ pFEQ{'ASYNC'}=vbfalse
  pW $ pFEQ{'ValidateOnParse'}=vbTrue
  pW $ pFEQ{'resolveExternals'}=vbFalse
  if pW $ pFEQ{'Load("'&clip(pfilename)&'")'}<>vbTrue then
    cParseError=pW $ pFEQ{'ParseError'}
    if cParseError[1]='`' then
      if pW $ pFEQ{cParseError & '.Errorcode'}<>0 then
            pErrorStr='Errorcode=' & pW $ pFEQ{cParseError & '.Errorcode'} &
|
                          ' Reason='& pW $ pFEQ{cParseError & '.Reason'} & |
                          ' Line='& pW $ pFEQ{cparseError & '.line'} & |
                          ' Linepos='&pW $ pFEQ{cparseerror & '.linepos'} &
|
                          ' FilePos='&pW $ pFEQ{cParseError & '.filepos'} &
|
                          ' scrText='& pW $ pFEQ{cParseError & ',srcText'}
      end
      pW $ pFEQ{prop:release}=cParseError
      res=3
    else
      pErrorStr='Isthe MSxml com object installed?'
      res=3
    end
  end
  return res



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