Question to adopt enhancement to HTTP API - http_parser_switch_cb()

[Thomas Raddatz <thomas.raddatz@xxxxxxxxxxx>]

Hi Scott,

I already tried to contact you by e-mail but since I did not get any reply I assume that I used an old 
e-mail address.

I want to ask you to adopt the enhancement that I developed for HTTP API V1.21. Nowadays you specify a 
start and an end element callback procedure for e.g. http_post_xml(). With the enhancement you can 
change the (start/end element) callback procedures for a given sub-tree of the XML stream. You do that 
by calling http_parser_switch_cb() from within a start element callback procedure. From that point on 
the parser calls the new callback procedures. The old onces are pushed on a stack. When the parser 
reaches the corresponding end element the previous callback procedures are restored.

Changing the callback procedures is particular useful if the same sub-trees appears at different 
locations (levels) in the XML stream. For example think of a <message> element that contains an <ID> 
and a <TEXT> element. That <message> element may appear at different levels of the XML stream. 
Wouldn't it be nice to use the same code to get the message information from the XML stream regardless 
of where the <message> element appears? With http_parser_switch_cb() you can change the callback 
procedures and the user data when the parser hits a <message> element. Now the specialized message 
callback procedures can get the message information out of the XML stream and put it into that portion 
of the user data that is supposed to take the message information. Level and path information is 
adjusted accordingly.

Description:

rc = http_parser_switch_cb(peUsrDta: peStartProc: peEndProc)


        peUsrDta = (input) user-defined data that will be passed to
                           the call-back routine. usually only that
                           portion of the current user data is forwarded
                           to the new callback procedures that they are
                           responsible for.
     peStartProc = (input) call-back procedure to call at the start
                           of each XML element received.
       peEndProc = (input) call-back procedure to call at the end
                           of each XML element received.

     Returns  -1 upon failure, 0 upon success


I want to utilize that enhancement to write a WSDL2RPG generator to produce an RPG Web Service stub 
for a given Web Service operation. So far I generate a specialized set of callback procedures for each 
complex element of the XML stream. Whenever the parser hits a complex element it delegates element 
processing to the specialized procedures.

I can send to you patch files and an example program if you want to have a closer look at it.

Regards,

Thomas Raddatz.


-----------------------------------------------------------------------
This is the FTPAPI mailing list.  To unsubscribe, please go to:
http://www.scottklement.com/mailman/listinfo/ftpapi
-----------------------------------------------------------------------