Sample Code
Windows Driver Samples/ XPSDrv Driver and Filter Sample/ C++/ src/ filters/ common/ saxhndlr.cpp/
/*++
Copyright (c) 2005 Microsoft Corporation
All rights reserved.
THIS CODE AND INFORMATION IS PROVIDED "AS IS" WITHOUT WARRANTY OF
ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING BUT NOT LIMITED TO
THE IMPLIED WARRANTIES OF MERCHANTABILITY AND/OR FITNESS FOR A
PARTICULAR PURPOSE.
File Name:
saxhndlr.cpp
Abstract:
Default sax handler implementation. Provides default implementations
for the ISAXContentHandler. This allows derived classes to only need
to implement the methods that are required.
--*/
#include "precomp.h"
#include "debug.h"
#include "globals.h"
#include "xdstring.h"
#include "xdexcept.h"
#include "saxhndlr.h"
#include "widetoutf8.h"
/*++
Routine Name:
CSaxHandler::CSaxHandler
Routine Description:
CSaxHandler class constructor
Arguments:
None
Return Value:
None
--*/
CSaxHandler::CSaxHandler() :
CUnknown<ISAXContentHandler>(IID_ISAXContentHandler)
{
}
/*++
Routine Name:
CSaxHandler::~CSaxHandler
Routine Description:
CSaxHandler class destructor
Arguments:
None
Return Value:
None
--*/
CSaxHandler::~CSaxHandler()
{
}
/*++
Routine Name:
CSaxHandler::putDocumentLocator
Routine Description:
This routine is the default implementation for ISAXContentHandler::putDocumentLocator
Arguments:
Unused
Return Value:
HRESULT
S_OK - Always succeeds
--*/
HRESULT STDMETHODCALLTYPE
CSaxHandler::putDocumentLocator(
ISAXLocator *
)
{
return S_OK;
}
/*++
Routine Name:
CSaxHandler::startDocument
Routine Description:
This routine is the default implementation for ISAXContentHandler::startDocument
Arguments:
Unused
Return Value:
HRESULT
S_OK - Always succeeds
--*/
HRESULT STDMETHODCALLTYPE
CSaxHandler::startDocument(
void
)
{
return S_OK;
}
/*++
Routine Name:
CSaxHandler::endDocument
Routine Description:
This routine is the default implementation for ISAXContentHandler::endDocument
Arguments:
Unused
Return Value:
HRESULT
S_OK - Always succeeds
--*/
HRESULT STDMETHODCALLTYPE
CSaxHandler::endDocument(
void
)
{
return S_OK;
}
/*++
Routine Name:
CSaxHandler::startPrefixMapping
Routine Description:
This routine is the default implementation for ISAXContentHandler::startPrefixMapping
Arguments:
Unused
Return Value:
HRESULT
S_OK - Always succeeds
--*/
HRESULT STDMETHODCALLTYPE
CSaxHandler::startPrefixMapping(
CONST wchar_t*,
INT,
CONST wchar_t*,
INT
)
{
return S_OK;
}
/*++
Routine Name:
CSaxHandler::endPrefixMapping
Routine Description:
This routine is the default implementation for ISAXContentHandler::endPrefixMapping
Arguments:
Unused
Return Value:
HRESULT
S_OK - Always succeeds
--*/
HRESULT STDMETHODCALLTYPE
CSaxHandler::endPrefixMapping(
CONST wchar_t*,
INT
)
{
return S_OK;
}
/*++
Routine Name:
CSaxHandler::startElement
Routine Description:
This routine is the default implementation for ISAXContentHandler::startElement
Arguments:
Unused
Return Value:
HRESULT
S_OK - Always succeeds
--*/
HRESULT STDMETHODCALLTYPE
CSaxHandler::startElement(
CONST wchar_t*,
INT,
CONST wchar_t*,
INT,
CONST wchar_t*,
INT,
_In_ ISAXAttributes*
)
{
return S_OK;
}
/*++
Routine Name:
CSaxHandler::endElement
Routine Description:
This routine is the default implementation for ISAXContentHandler::endElement
Arguments:
Unused
Return Value:
HRESULT
S_OK - Always succeeds
--*/
HRESULT STDMETHODCALLTYPE
CSaxHandler::endElement(
CONST wchar_t*,
INT,
CONST wchar_t*,
INT,
CONST wchar_t*,
INT
)
{
return S_OK;
}
/*++
Routine Name:
CSaxHandler::characters
Routine Description:
This routine is the default implementation for ISAXContentHandler::characters
Arguments:
Unused
Return Value:
HRESULT
S_OK - Always succeeds
--*/
HRESULT STDMETHODCALLTYPE
CSaxHandler::characters(
CONST wchar_t*,
INT
)
{
return S_OK;
}
/*++
Routine Name:
CSaxHandler::ignorableWhitespace
Routine Description:
This routine is the default implementation for ISAXContentHandler::ignorableWhitespace
Arguments:
Unused
Return Value:
HRESULT
S_OK - Always succeeds
--*/
HRESULT STDMETHODCALLTYPE
CSaxHandler::ignorableWhitespace(
CONST wchar_t*,
INT
)
{
return S_OK;
}
/*++
Routine Name:
CSaxHandler::processingInstruction
Routine Description:
This routine is the default implementation for ISAXContentHandler::processingInstruction
Arguments:
Unused
Return Value:
HRESULT
S_OK - Always succeeds
--*/
HRESULT STDMETHODCALLTYPE
CSaxHandler::processingInstruction(
CONST wchar_t*,
INT,
CONST wchar_t*,
INT
)
{
return S_OK;
}
/*++
Routine Name:
CSaxHandler::skippedEntity
Routine Description:
This routine is the default implementation for ISAXContentHandler::skippedEntity
Arguments:
Unused
Return Value:
HRESULT
S_OK - Always succeeds
--*/
HRESULT STDMETHODCALLTYPE
CSaxHandler::skippedEntity(
CONST wchar_t*,
INT
)
{
return S_OK;
}
/*++
Routine Name:
CSaxHandler::WriteToPrintStream
Routine Description:
This routine converts a CStringXDW buffer to UTF-8 string to be
written to the write stream provided. This overload handles accepts
an IPrintWriteStream to write the data out.
Arguments:
pcstrOut - Pointer to the Atl CStringXDW containing the mark-up to be written
pWriter - Pointer to the print write stream to write to
Return Value:
HRESULT
S_OK - On success
E_* - On error
--*/
HRESULT
CSaxHandler::WriteToPrintStream(
_In_ CStringXDW* pcstrOut,
_In_ IPrintWriteStream* pWriter
)
{
HRESULT hr = S_OK;
if (SUCCEEDED(hr = CHECK_POINTER(pcstrOut, E_POINTER)) &&
SUCCEEDED(hr = CHECK_POINTER(pWriter, E_POINTER)))
{
ULONG cbWritten = 0;
PVOID pData = NULL;
ULONG cbData = 0;
try
{
CWideToUTF8 wideToUTF8(pcstrOut);
if (SUCCEEDED(hr = wideToUTF8.GetBuffer(&pData, &cbData)))
{
hr = pWriter->WriteBytes(pData, cbData, &cbWritten);
}
}
catch (CXDException& e)
{
hr = e;
}
}
ERR_ON_HR(hr);
return hr;
}
/*++
Routine Name:
CSaxHandler::WriteToPrintStream
Routine Description:
This routine converts a CStringXDW buffer to UTF-8 string to be
written to the write stream provided. This overload handles accepts
an ISequentialStream to write the data out.
Arguments:
pcstrOut - Pointer to the Atl CStringXDW containing the mark-up to be written
pWriter - Pointer to the print write stream to write to
Return Value:
HRESULT
S_OK - On success
E_* - On error
--*/
HRESULT
CSaxHandler::WriteToPrintStream(
_In_ CStringXDW* pcstrOut,
_In_ ISequentialStream* pWriter
)
{
HRESULT hr = S_OK;
if (SUCCEEDED(hr = CHECK_POINTER(pcstrOut, E_POINTER)) &&
SUCCEEDED(hr = CHECK_POINTER(pWriter, E_POINTER)))
{
ULONG cbWritten = 0;
PVOID pData = NULL;
ULONG cbData = 0;
try
{
CWideToUTF8 wideToUTF8(pcstrOut);
if (SUCCEEDED(hr = wideToUTF8.GetBuffer(&pData, &cbData)))
{
hr = pWriter->Write(pData, cbData, &cbWritten);
}
}
catch (CXDException& e)
{
hr = e;
}
}
ERR_ON_HR(hr);
return hr;
}
/*++
Routine Name:
CSaxHandler::EscapeEntity
Routine Description:
The UnicodeString mark-up could contain characters that need to be escaped (the
SAX handler is passed the characters and not the original escapes).
The list of characters which need to be escaped are defined in the XML standard
and may change in future revisions.
This routine takes a BSTR and replaces all instances of these characters with
their escaped versions.
Arguments:
pStr - Pointer to the BSTR to be converted
Return Value:
HRESULT
S_OK - On success
E_* - On error
--*/
HRESULT
CSaxHandler::EscapeEntity(
_Inout_ BSTR* pStr
)
{
HRESULT hr = S_OK;
if (SUCCEEDED(hr = CHECK_POINTER(pStr, E_POINTER)))
{
try
{
if (SysStringLen(*pStr) > 0)
{
CStringXDW cstrStr(*pStr);
cstrStr.Replace(L"&", L"&");
cstrStr.Replace(L"<", L"<");
cstrStr.Replace(L">", L">");
cstrStr.Replace(L"\"", L""");
cstrStr.Replace(L"'", L"'");
SysFreeString(*pStr);
*pStr = cstrStr.AllocSysString();
}
}
catch (CXDException& e)
{
hr = e;
}
}
ERR_ON_HR(hr);
return hr;
}
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