68 lines
2.2 KiB
C
68 lines
2.2 KiB
C
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// Copyright (c) 2000 Microsoft Corporation. All rights reserved.
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//
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// Helpers for implementation of ISpecifyPropertyPages and IPersistStream
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//
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#pragma once
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#include "ocidl.h"
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// Paste these declarations into your class methods to implement the interfaces. Replace DSFXZZZ with the name of your struct.
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// These assume that you implement GetAllParameters/SetAllParameters interfaces with a struct and that you have a public m_fDirty
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// member variable that you use to hold the dirty state of your object for persistence.
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/*
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// ISpecifyPropertyPages
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STDMETHOD(GetPages)(CAUUID * pPages) { return PropertyHelp::GetPages(CLSID_DirectSoundPropZZZ, pPages); }
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// IPersistStream
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STDMETHOD(IsDirty)(void) { return m_fDirty ? S_OK : S_FALSE; }
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STDMETHOD(Load)(IStream *pStm) { return PropertyHelp::Load(this, DSFXZZZ(), pStm); }
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STDMETHOD(Save)(IStream *pStm, BOOL fClearDirty) { return PropertyHelp::Save(this, DSFXZZZ(), pStm, fClearDirty); }
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STDMETHOD(GetSizeMax)(ULARGE_INTEGER *pcbSize) { if (!pcbSize) return E_POINTER; pcbSize->QuadPart = sizeof(DSFXZZZ); return S_OK; }
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*/
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// Load, Save, and GetPages are actually implemented in the following functions.
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namespace PropertyHelp
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{
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HRESULT GetPages(const CLSID &rclsidPropertyPage, CAUUID * pPages);
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template<class O, class S> HRESULT Load(O *pt_object, S &t_struct, IStream *pStm)
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{
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ULONG cbRead;
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HRESULT hr;
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if (pStm==NULL)
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return E_POINTER;
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hr = pStm->Read(&t_struct, sizeof(t_struct), &cbRead);
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if (hr != S_OK || cbRead < sizeof(t_struct))
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return E_FAIL;
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hr = pt_object->SetAllParameters(&t_struct);
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pt_object->m_fDirty = false;
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return hr;
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}
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template<class O, class S> HRESULT Save(O *pt_object, S &t_struct, IStream *pStm, BOOL fClearDirty)
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{
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HRESULT hr;
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if (pStm==NULL)
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return E_POINTER;
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hr = pt_object->GetAllParameters(&t_struct);
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if (FAILED(hr))
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return hr;
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ULONG cbWritten;
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hr = pStm->Write(&t_struct, sizeof(t_struct), &cbWritten);
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if (hr != S_OK || cbWritten < sizeof(t_struct))
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return E_FAIL;
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if (fClearDirty)
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pt_object->m_fDirty = false;
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return S_OK;
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}
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};
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