Hi Ben,
On 8/16/06, Ben Meijering <[EMAIL PROTECTED]> wrote:
I am building an XML parser in C++. The manner in which a document is
parsed is defined in a XML document, where handler functions are defined
for certain tags and attributes.
These functions are registered in a function repository beforehand and
can be of any kind, for now only C++ and Perl. These functions have
Xerces objects as arguments. I could stick solely to C++ functions, but
I figured if Xerces had a similar construction just like wxPerl has,
this could be a nice addition to my application.
OK, I got a better picture of what you're doing, thanks.
No one has asked for this feature before. It is relatively trivial -
since Xerces-Perl has to do this same action at ever method
invocation, but there isn't a simple method for it. The reason for
this is that you have to know what type the object is - and that type
is given as a SWIG type_info struct (since Xerces-Perl is created by
wrapping Xerces-C using SWIG). That type_info struct is very version
dependent and would not work across different releases of Xerces-Perl.
So for example:
res3 = SWIG_ConvertPtr(ST(1), &argp3, SWIGTYPE_p__XMLGrammarPool, 0 | 0 );
if (!SWIG_IsOK(res3)) {
SWIG_exception_fail(SWIG_ArgError(res3), "in method '"
"new_XercesDOMParser" "', argument " "3"" of type '" "XMLGrammarPool
*const""'");
}
arg3 = reinterpret_cast<XMLGrammarPool * >(argp3);
would take the the perl SV* sitting in ST(1) - the second var on the
stack - and convert it to an void* into the var argp3. If res3 is OK -
meaning all the error checking worked, then you can safely do the cast
of argp3 to arg3 with all the type information.
but you see - you need access to that 'SWIGTYPE_p__XMLGrammarPool'
pointer, which at the moment is compiled into Xerces.cpp and not
accessible from a header file.
I have wanting to do that for many years, but I have never had the
reason to spend the time to make it work. If you are sufficiently
motivated, I will put aside some time and get it working if you are
will to test it with Xerces-C-3.0-beta (I'm no longer updating older
versions of Xerces-Perl).
Cheers, jas.
