Bugs item #1374637, was opened at 2005-12-06 11:15
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Category: CustomActions
Group: None
Status: Open
Resolution: None
Priority: 5
Submitted By: Jack Metcalfe (jackmetcalfe)
Assigned to: Nobody/Anonymous (nobody)
Summary: XmlFile only supports simple XPath queries
Initial Comment:
The documentation suggests 'escaping' square brackets
[]. I tried 'escaping' using a C style escape
backslash \. This resulted in the \ going all the
way through and being processed with the backslash as
part of the XPath.
While inexperienced with the Installer API it appears
that MsiRecordGetStringW() will process any square
brackets [] and does not know of the escape backslash
\. As a result any XPath string that uses square
brackets [] will be removed, unless they expand to a
defined Property.
Also XmlFile.cpp only allocates MAX_PATH characters
for the wzElementPath element of the XML_FILE_CHANGE
structure. MAX_PATH evaluates to 260 in my
environment. This is easily exceeded with most of
the queries that I have been working with.
I view it as a kludge but my solution is to increase
the size of wzElementPath to an arbitrary 8K.
I also changed ReadXmlFileTable in XmlFile.cpp to
look for curly braces {} in the XPath and replace
with square braces [].
I am still working with my installer yet and will
follow up with any additional information, including
errors that I uncover regarding these statements.
ie.) input with curly braces
ElementPath="/*{local-name()
='dataConfiguration'}/*{local-name()
='xmlSerializerSection'}/*{local-name()
='enterpriseLibrary.databaseSettings'}/*{local-name()
='connectionStrings'}/*{local-name()
='connectionString' and @name='Sql Connection
String'}/*{local-name()='parameters'}/*{local-name(.)
='parameter' and @name='server'}/@value"
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