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reading XLM file in Delphi (IXMLDocument) not working

Posted on 2014-03-11
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Last Modified: 2014-03-11
I'm successfully writing an XML document with IXMLDocument which, slightly simplified, looks like this:
<?xml version="1.0"?>
<Email>
<Subject>3 events scheduled starting 3/13 1:30 PM: Job 1034</Subject>
<DeptID>111</DeptID>
<sPersonIDs>10240; 175</sPersonIDs>
<MessageText>3/11, 3/12, 3/13 1:30 - 5:00 PM Water Damage Assigned to: Bilbo Baggins</MessageText>
</Email>

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My attempt to read the file looks like this:
procedure TChronEmail.GetFromTempFile;
  var
    i:integer;
    sFile : string;
    Doc: IXMLDocument;
    Email: IXMLNode;
begin
  sFile := [filename--I've tested that it is valid and that it is there];
  if fileExists(sFile) then begin
    Doc.LoadFromFile(sFile);
    i := 0; // for this test, only need the first entry in the file
    Email := DOC.ChildNodes.Nodes['Email'].ChildNodes[i];
    Subject := Email.ChildNodes['Subject'].Text;
    if tryStrToInt(Email.ChildNodes['DeptID'].Text, i) then DeptID := i;
    sPersonIDs := Email.ChildNodes['sPersonIDs'].Text;
    MessageText := Email.ChildNodes['MessageText'].Text;

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Apparently I'm missing something important since I'm not getting any values back out of my file. This is my first time working with IXMLDocument/IXMLNode, so happy for any guidance. Thanks.
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Question by:EricTaylor
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6 Comments
 
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Expert Comment

by:mlmcc
ID: 39921263
Are you sure the code for the file found test is being run?

Is the childnode array dimensioned from 0 or 1?

mlmcc
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LVL 45

Accepted Solution

by:
aikimark earned 500 total points
ID: 39921404
Since I don't see any parent to the Email node(s), the following change should return results.
Email := DOC.ChildNodes.Nodes['Email'];

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If the XML had been like the following...
<?xml version="1.0"?>
<Emails>
<Email>
<Subject>3 events scheduled starting 3/13 1:30 PM: Job 1034</Subject>
<DeptID>111</DeptID>
<sPersonIDs>10240; 175</sPersonIDs>
<MessageText>3/11, 3/12, 3/13 1:30 - 5:00 PM Water Damage Assigned to: Bilbo Baggins</MessageText>
</Email>
</Emails>

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then your original statement should have been:
Email := DOC.ChildNodes.Nodes['Emails'].ChildNodes[i];

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LVL 45

Expert Comment

by:aikimark
ID: 39921427
Note: some XPathing might also get you the first Email item.
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Author Closing Comment

by:EricTaylor
ID: 39921591
Thanks. That did the trick and now I understand how the pieces are relating here.

I didn't understand the XPathing comment though; would appreciate if you would clarify to give me a better understanding.
0
 
LVL 45

Expert Comment

by:aikimark
ID: 39921856
@EricTaylor

Maybe it would be better if I point you at some instructional material on XPath to get you up to speed.
http://www.w3schools.com/XPath/ (tutorial)
http://www.w3schools.com/xpath/xpath_syntax.asp (syntax)

Since we're in a Delphi development environment, you would probably benefit from seeing some Delphi code examples that use XPath.
http://delphi.about.com/od/vclusing/qt/delphi-select-xml-nodes-ixmlnodelist-selectnodes-xpath-xmldom.htm  (Delphi example)
http://keith-wood.name/DelphiXML/BookCode/  (lots of Delphi examples in this ebook/article)

If you are still stuck after playing with this, you can ask a new question about XPathing and your Delphi code.
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Author Comment

by:EricTaylor
ID: 39921985
thanks  :)
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