170 lines
3.4 KiB
C++
170 lines
3.4 KiB
C++
// THIS CODE AND INFORMATION IS PROVIDED "AS IS" WITHOUT WARRANTY OF
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// ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING BUT NOT LIMITED TO
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// THE IMPLIED WARRANTIES OF MERCHANTABILITY AND/OR FITNESS FOR A
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// PARTICULAR PURPOSE.
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//
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// Copyright (c) Microsoft Corporation. All rights reserved.
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#include "StdAfx.h"
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#include "BaseContent.h"
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CBaseContent::CBaseContent() :
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m_nRef(0),
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m_contentID(CONTENT_ID_HOME)
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{
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AddRef();
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}
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CBaseContent::~CBaseContent()
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{
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}
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//
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// IUnknown methods
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//
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HRESULT CBaseContent::QueryInterface(
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REFIID riid,
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LPVOID* ppvObject
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)
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{
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if (IID_IUnknown == riid ||
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IID_ISideShowContent == riid)
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{
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*ppvObject = this;
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AddRef();
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return S_OK;
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}
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return E_NOINTERFACE;
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}
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ULONG CBaseContent::AddRef()
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{
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return ::InterlockedIncrement(&m_nRef);
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}
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ULONG CBaseContent::Release()
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{
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LONG nRef = ::InterlockedDecrement(&m_nRef);
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if (0 == nRef)
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{
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delete this;
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}
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return nRef;
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}
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//
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// ISideShowContent methods
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//
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HRESULT CBaseContent::GetContent(
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ISideShowCapabilities *pICapabilities,
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DWORD *pdwSize,
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BYTE **ppbData)
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{
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HRESULT hr = S_OK;
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DWORD dwSize = 0;
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BYTE* pbData = NULL;
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//
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// Call the subclass to retrieve the
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// content and size to add.
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//
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LoadContent(&dwSize, &pbData, pICapabilities);
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if (NULL != pbData)
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{
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//
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// COM requires memory passed out to be alloc'ed by
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// CoTaskMemAlloc. Allocate enough to hold the
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// data returned by the subclass and then copy
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// the data into the new buffer.
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//
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BYTE* pbBuf = (BYTE*)::CoTaskMemAlloc(dwSize);
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if (NULL != pbBuf)
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{
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memcpy(pbBuf, pbData, dwSize);
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//
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// Assuming all went well, return the
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// information to the platform.
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//
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*pdwSize = dwSize;
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*ppbData = pbBuf;
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}
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else
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{
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hr = E_OUTOFMEMORY;
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}
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//
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// Call the subclass to free the data;
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// pbData is no longer valid after this call
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//
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FreeContent(&pbData);
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pbData = NULL;
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}
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else
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{
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hr = E_UNEXPECTED;
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}
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return hr;
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}
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HRESULT CBaseContent::get_ContentId(
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PCONTENT_ID pcontentId)
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{
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if (NULL != pcontentId)
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{
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//
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// Return the CONTENT_ID associated with
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// this instance of the content object.
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// The member variable m_contentID should
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// be overwritten by subclasses according
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// to the content.
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//
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*pcontentId = m_contentID;
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}
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return S_OK;
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}
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HRESULT CBaseContent::get_DifferentiateContent(
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BOOL *pfDifferentiateContent)
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{
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if (NULL != pfDifferentiateContent)
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{
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//
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// FALSE = we do not differentiate content for different display types
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//
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*pfDifferentiateContent = TRUE;
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}
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return S_OK;
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}
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LPSTR CBaseContent::AllocTaskUtf8String(LPCWSTR lpszString)
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{
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if (lpszString == NULL)
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{
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return NULL;
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}
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UINT nBytes = (UINT)((wcslen(lpszString)+1)*2);
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LPSTR lpszResult = (LPSTR)::CoTaskMemAlloc(nBytes);
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if (lpszResult != NULL)
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{
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int nRet = WideCharToMultiByte(CP_UTF8, 0, lpszString, -1, lpszResult, nBytes, NULL, NULL);
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if (nRet == 0)
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{
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::CoTaskMemFree(lpszResult);
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lpszResult = NULL;
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}
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}
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return lpszResult;
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}
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