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//+--------------------------------------------------------------------------
//
// Copyright (c) Microsoft Corporation. All rights reserved.
//
// This source code is intended only as a supplement to Microsoft
// Development Tools and/or on-line documentation. See these other
// materials for detailed information regarding Microsoft code samples.
//
// THIS CODE AND INFORMATION ARE 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.
//
// Abstract:
// WDK print filter sample.
// This is the C file for the stream filter sample.
//
//----------------------------------------------------------------------------
#include "precomp.hxx"
#include "main.hxx"
#include "StreamFilter.tmh"
#include "StreamFilter.hxx"
#include "winddiui.h"
#include "compstui.h"
#include "printoem.h"
#include "initguid.h"
#include "prcomoem.h"
_Analysis_mode_(_Analysis_code_type_user_driver_)
//
// 5f5460d2-b313-44ca-82e4-37f83d793999 - generate a guid, do not use this one in your code
//
const GUID StreamFilterGuid = {0x5f5460d2, 0xb313, 0x44ca, {0x82, 0xe4, 0x37, 0xf8, 0x3d, 0x79, 0x39, 0x99}};
const GUID&
StreamFilter::
FilterClsid(
void
)
{
return StreamFilterGuid;
}
StreamFilter::
StreamFilter() :
m_bShutdown(false),
m_cRef(1)
{
}
//
// IUnknown methods
//
__override
STDMETHODIMP
StreamFilter::
QueryInterface(
_In_ REFIID riid,
_Out_ void **ppv
)
{
HRESULT hRes = E_POINTER;
if (ppv)
{
hRes = E_NOINTERFACE;
*ppv = NULL;
if (riid == IID_IPrintPipelineFilter)
{
*ppv = static_cast<IPrintPipelineFilter *>(this);
}
else if (riid == IID_IUnknown)
{
*ppv = static_cast<IUnknown *>(this);
}
if (*ppv)
{
AddRef();
hRes = S_OK;
}
}
return hRes;
}
__override
STDMETHODIMP_(ULONG)
StreamFilter::
AddRef(
void
)
{
return InterlockedIncrement(&m_cRef);
}
__override
STDMETHODIMP_(ULONG)
StreamFilter::
Release(
void
)
{
ULONG cRefCount = InterlockedDecrement(&m_cRef);
if (cRefCount)
{
return cRefCount;
}
delete this;
return 0;
}
//
// IPrintPipelineFilter
//
__override
STDMETHODIMP
StreamFilter::
ShutdownOperation(
void
)
{
m_bShutdown = true;
return S_OK;
}
__override
STDMETHODIMP
StreamFilter::
InitializeFilter(
_In_ IInterFilterCommunicator *pIFilterCommunicator,
_In_ IPrintPipelinePropertyBag *pIPropertyBag,
_In_ IPrintPipelineManagerControl *pIPipelineControl
)
{
HRESULT hr = S_OK;
VARIANT varHelper;
PCSTR *pFeatures = NULL;
DWORD dwFeatures = 0;
Tools::SmartPtr<IPrintCoreHelper> pHelper;
VariantInit(&varHelper);
//
// StreamAccessSequential, IID_IPrintReadStream
//
hr = pIFilterCommunicator->RequestReader(reinterpret_cast<void **>(&m_pIRead));
if (SUCCEEDED(hr))
{
//
// StreamAccessSequential, StreamModify, IID_IPrintWriteStream
//
hr = pIFilterCommunicator->RequestWriter(reinterpret_cast<void **>(&m_pIWrite));
}
if (SUCCEEDED(hr))
{
m_pIPipelineControl = pIPipelineControl;
}
//
// This shows how to use the helper interface to read information
// from a UnidrvUI based configuration module.
//
if (SUCCEEDED(hr))
{
hr = pIPropertyBag->GetProperty(L"IPrintCoreHelper", &varHelper);
}
if (SUCCEEDED(hr) && V_UNKNOWN(&varHelper))
{
hr = (V_UNKNOWN(&varHelper))->QueryInterface(IID_IPrintCoreHelper, (VOID**)(&pHelper));
}
//
// No need to release buffers provided by the helper. Their
// lifetime matches that of the helper.
//
if (SUCCEEDED(hr) && pHelper)
{
hr = pHelper->EnumFeatures(&pFeatures, &dwFeatures);
}
if (SUCCEEDED(hr) && dwFeatures > 0)
{
for (DWORD i = 0; i < dwFeatures; i++)
{
DoTraceMessage(WS_TRACE, L"StreamFilter::InitializeFilter: Feature found: %s", pFeatures[i]);
}
}
VariantClear(&varHelper);
return hr;
}
__override
STDMETHODIMP
StreamFilter::
StartOperation(
void
)
{
HRESULT hr = S_OK;
Tools::SmartPtr<IImgErrorInfo> pIErrorInfo;
DWORD cbRead;
BYTE *pReadBuf;
BOOL bEof = FALSE;
pReadBuf = new BYTE[kBufferSize];
if (!pReadBuf)
{
hr = E_OUTOFMEMORY;
}
while (SUCCEEDED(hr) && !bEof && !m_bShutdown)
{
hr = m_pIRead->ReadBytes(pReadBuf, kBufferSize, &cbRead, &bEof);
if (SUCCEEDED(hr) && cbRead)
{
ULONG cbWritten;
hr = m_pIWrite->WriteBytes(pReadBuf, cbRead, &cbWritten);
if (SUCCEEDED(hr))
{
DoTraceMessage(WS_TRACE, "StreamFilter::StartOperation read and wrote %u bytes", cbRead);
}
}
}
m_pIWrite->Close();
if (FAILED(hr))
{
m_pIPipelineControl->RequestShutdown(hr, pIErrorInfo);
}
if (m_pIPipelineControl)
{
m_pIPipelineControl->FilterFinished();
}
delete [] pReadBuf;
return hr;
}
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