Simple XML question

[Wardeaux]

All,
this XML is killing me... I'm new to XML, all I want to do is parse an XML
string so that I can read the values...

Mystr = "<A1><B1><C1>myC1</C1><C2>myC2</C2></B1><B2>myB2</B2><A1>"

All I need is a simple routine to parse this and display Name/Value pairs in
a MSGBOX like:
C1:myC1
C2:myC2
B2:myB2

All assistance is MOST appreciated!!!
wardeaux

 

[Hal Rosser]

Sounds like homework at CSU.
one way is to read one char at a time and parse

 

[Derek Harmon]

this XML is killing me... I'm new to XML, all I want to do is parse an XML
string so that I can read the values...

Mystr = "<A1><B1><C1>myC1</C1><C2>myC2</C2></B1><B2>myB2</B2><A1>"

Another way is to create an XmlDocument and use LoadXml to parse the string.

Dim doc As XmlDocument = New XmlDocument( )
doc.LoadXml( Mystr)
' . . . do things to read from doc.

Most direct starting point begins from the DocumentElement of doc, and then
you navigate the objects it gives you called XmlNodes through properties like
ChildNodes, et al.

Each XmlNode has a LocalName property (i.e., A1, B1, C2) if it's NodeType
= Element, and it has a Value property (i.e., "myC1", "myC2") if it's NodeType
= Text (at least, these are the properties most likely to interest you aside from
navigating from one XmlNode to the next). The Text nodes will be children of
the Element nodes that contain them.

Other more powerful approaches include SelectSingleNode( ) and SelectNodes( ),
but these require a good background in XPath 1.0; and there's also the venerable
GetElementsByTagName( ). For an example of the latter,

Dim node As XmlNode
Dim nodes As XmlNodeList
nodes = doc.GetElementsByTagName( "C1")
For Each node In nodes
'
' Do something with this node (it's NodeType will be Element) named C1.
'
Next node


Derek Harmon

 

[Wardeaux]

Sounds like homework at CSU.
I wish...

one way is to read one char at a time and parse

Sorry... parsing one char at a time is slow, inefficient and impractical...
The structure I will be parsing has many records and many levels within the
record... I know MS has spent a lot of $$ on XML and the associated classes,
I'm just needing a place to start digging in on it all...
thanks for the reply, though...
wardeaux

 

[Wardeaux]

Derek,
thanks for the reply... This is a great starting point!!
In real life I'm going to be receiving a stream with multiple <a1>
records... will the SelectSingleNode work better for extracting each record
in sequence or do I need another approach?
thanks again!!
wardeaux