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4/8/2010

After you create the MyContent.h file, the next step is to implement the ContentHandler class, named MyContent.

Example

The following code example shows how to implement ContentHandler.

Note:
To make the following code example easier to read, error checking is not included. This code example should not be used in a release configuration unless it has been modified to include secure error handling.
Copy Code 
#include "stdafx.h"
#include "MyContent.h"

//////////////////////////////////////////////////////////////////////
// Construction/Destruction
//////////////////////////////////////////////////////////////////////

MyContent::MyContent()
{
   idnt = 0;
}

MyContent::~MyContent()
{

}

HRESULT STDMETHODCALLTYPE MyContent::startElement( 
			/* [in] */ wchar_t __RPC_FAR *pwchNamespaceUri,
			/* [in] */ int cchNamespaceUri,
			/* [in] */ wchar_t __RPC_FAR *pwchLocalName,
			/* [in] */ int cchLocalName,
			/* [in] */ wchar_t __RPC_FAR *pwchQName,
			/* [in] */ int cchQName,
			/* [in] */ ISAXAttributes __RPC_FAR *pAttributes)
{
   HRESULT hr = S_OK;
   int l;
   printf("\n%*s",3 * idnt++, "");
	prt(L"<%s",pwchLocalName,cchLocalName);
   pAttributes->getLength(&l);
   for ( int i=0; i<l; i++ ) {
	wchar_t * ln, * vl; int lnl, vll;
	pAttributes->getLocalName(i,&ln,&lnl); 
	prt(L" %s=", ln, lnl);
	pAttributes->getValue(i,&vl,&vll);
	prt(L"\"%s\"", vl, vll);
   }
   printf(">");

   // A little example, how to abort parse
   if ( wcsncmp(pwchLocalName,L"qu",2) == 0 ) {
	printf("\n<qu> tag encountered, parsing aborted.");
	hr = E_FAIL;
   }

	return hr;
}
	
	 
HRESULT STDMETHODCALLTYPE MyContent::endElement( 
			/* [in] */ wchar_t __RPC_FAR *pwchNamespaceUri,
			/* [in] */ int cchNamespaceUri,
			/* [in] */ wchar_t __RPC_FAR *pwchLocalName,
			/* [in] */ int cchLocalName,
			/* [in] */ wchar_t __RPC_FAR *pwchQName,
			/* [in] */ int cchQName)
{
   printf("\n%*s",3 * --idnt, "");
	prt(L"</%s>",pwchLocalName,cchLocalName);
	return S_OK;
}

HRESULT STDMETHODCALLTYPE MyContent::startDocument()
{
	printf("<?xml version=\"1.0\" ?>");
	return S_OK;
}
	
void MyContent::prt(
			/* [in] */ const wchar_t * pwchFmt,
			/* [in] */ const wchar_t __RPC_FAR *pwchVal,
			/* [in] */ int cchVal)
{
	static wchar_t val[1000];
	cchVal = cchVal>999 ? 999 : cchVal;
	wcsncpy( val, pwchVal, cchVal ); val[cchVal] = 0;
	wprintf(pwchFmt,val);
}

See Also