The documentation says getDOMImplementation() returns "the first registered implementation that has the desired features." This implies that there is some sort of Xerces-managed list of implementations, and that you're just getting a pointer to an element in that list. Therefore, one should not release that pointer. The fact that the docs don't mention the need to release the pointer supports this, but just to be sure, I looked at the source (which is available online at http://cvs.apache.org/viewcvs.cgi/xml-xerces/c/src/xercesc/dom/impl/DOMI mplementationRegistry.cpp?view=markup), which confirms it.
> -----Original Message----- > From: Monica Lau [mailto:[EMAIL PROTECTED] > Sent: Friday, April 09, 2004 12:15 PM > To: [EMAIL PROTECTED] > Subject: RE: DOMWriter Questions > > Hi, > > Thanks for this important piece of information. I > believe all the samples that I've seen so far use > someCall(XMLString::transcode(...)) > > What about the "getDOMImplementation(...)" function? > Does it dynamically allocate memory in the buffer? > (Sorry for my ignorance -- I tried looking at the API > for this, but couldn't find the info that I needed. > I'm just trying to ensure that I don't end up with > memory leaks in my application.) > > Thanks, > Monica > > > > --- Jesse Pelton <[EMAIL PROTECTED]> wrote: > > From the Xerces API documentation: > > > > XMLCh* XMLString::transcode ( const char *const > > toTranscode ) [static] > > > > Transcodes a string to native code-page. > > > > NOTE: The returned buffer is dynamically allocated > > and is the > > responsibility of > > the caller to delete it when not longer needed. > > You can call > > XMLString::release to > > release this returned buffer. > > > > So every time you call transcode(), you should be > > saving the returned > > pointer in order to release its memory. The > > following will leak the > > memory allocated by transcode(): > > > > someCall(XMLString::transcode("some string")); > > > > If the examples really use this idiom, something is > > wrong, either in the > > documentation (which I believe to be correct) or in > > the samples. > > > > ________________________________ > > > > From: Monica Lau [mailto:[EMAIL PROTECTED] > > Sent: Thursday, April 08, 2004 11:43 PM > > To: [EMAIL PROTECTED] > > Subject: Re: DOMWriter Questions > > > > > > Hi all, > > > > Thanks for all your responses. In the following > > code snippet > > (taken from DOMCreation and from DOMPrint), I just > > want to make sure > > that I've deleted all the memory approriately. Does > > the > > "getDOMImplementation()" function allocate memory on > > the heap? (I've > > looked at the online documentation, but couldn't > > find much about this.) > > > > > > Thanks again for your time and help. > > > > Regards, > > Monica > > > > > > DOMImplementation *impl = > > > > > DOMImplementationRegistry::getDOMImplementation(XMLString::tra > nscode("Co > > re")); > > > > DOMDocument *mydoc = > > > > > impl->createDocument(0,XMLString::transcode("company"),0); > > DOMElement *rootElem = mydoc->getDocumentElement(); > > DOMElement *prodElem = > > > > > mydoc->createElement(XMLString::transcode("product")); > > rootElem->appendChild(prodElem); > > DOMText *prodDataVal = > > > > > mydoc->createTextNode(XMLString::transcode("Xerces-C")); > > prodElem->appendChild(prodDataVal); > > > > DOMWriter *writer = impl->createDOMWriter(); > > cout << > > XMLString::transcode(writer->writeToString(*mydoc)) > > << > > endl; > > > > // Delete Memory > > writer->release(); > > mydoc->release(); > > delete impl; > > > > > --------------------------------------------------------------------- > > To unsubscribe, e-mail: > > [EMAIL PROTECTED] > > For additional commands, e-mail: > > [EMAIL PROTECTED] > > > > > __________________________________ > Do you Yahoo!? > Yahoo! Small Business $15K Web Design Giveaway > http://promotions.yahoo.com/design_giveaway/ > > --------------------------------------------------------------------- > To unsubscribe, e-mail: [EMAIL PROTECTED] > For additional commands, e-mail: [EMAIL PROTECTED] > > > --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
