SAX2 Visual Basic Common Notices

Visual Basic Wrappers

Microsoft® Visual Basic® wrappers are constructed from C++/COM interfaces by:

• Replacing the "I" prefix in front of the interface/class name with "IVB".
• Replacing all string representations from w_char_t*/int to BSTR. For handlers, strings should be passed by reference.
• Replacing IerrorInfo parameters with BSTRs containing error messages.
• Replacing HRESULT parameters with long.
• Making all parameter names follow simplified Hungarian notation for Visual Basic. For example, strName is used in place of pwchName. Prefixes are "srt", "n", "l", and "o".
• Wherever C++ uses NULL, Visual Basic uses VT_Empty.
• All interfaces are derived from IDispatch.

Currently, Visual Basic and C++ wrappers are completely disconnected for the user. However, the same coclasses implement both C++ and VB interfaces.

Features

Features handled and recognized by SAXXMLReader are:

• "exhaustive-errors"
• "http://xml.org/sax/features/external-general-entities"
• "http://xml.org/sax/features/external-parameter-entities"
• "http://xml.org/sax/features/lexical-handler/parameter-entities"
• "http://xml.org/sax/features/namespaces"
• "http://xml.org/sax/features/namespace-prefixes"
• "preserve-system-identifiers"
• "schema-validation"
• "server-http-request"

Properties

Properties handled and recognized by SAXXMLReader are:

• "http://xml.org/sax/properties/lexical-handler"
• "http://xml.org/sax/properties/declaration-handler"
• "http://xml.org/sax/properties/dom-node"
• "http://xml.org/sax/properties/xml-string"
• "schemas"
• "schema-declaration-handler"
• "charset"
• "xmldecl-encoding"
• "xmldecl-version"
• "xmldecl-standalone"

Base interface

All interfaces are derived from IDispatch.