windows-xp/Source/XPSP1/NT/shell/lib/cowsite.cpp

#include "stock.h"
#pragma hdrstop

#include "cowsite.h"

HRESULT CObjectWithSite::SetSite(IUnknown *punkSite)
{
    IUnknown_Set(&_punkSite, punkSite);
    return S_OK;
}

HRESULT CObjectWithSite::GetSite(REFIID riid, void **ppvSite)
{
    if (_punkSite)
        return _punkSite->QueryInterface(riid, ppvSite);

    *ppvSite = NULL;
    return E_FAIL;
}

HRESULT CSafeServiceSite::QueryInterface(REFIID riid, void **ppv)
{
    static const QITAB qit[] = {
        QITABENT(CSafeServiceSite, IServiceProvider),
        { 0 },
    };
    return QISearch(this, qit, riid, ppv);
}

ULONG CSafeServiceSite::AddRef()
{ 
    return InterlockedIncrement(&_cRef); 
}

ULONG CSafeServiceSite::Release()
{
    if (InterlockedDecrement(&_cRef)) 
        return _cRef;

    delete this;
    return 0;
}

HRESULT CSafeServiceSite::QueryService(REFGUID guidService, REFIID riid, void **ppvObj)
{
    if (_psp)
        return _psp->QueryService(guidService, riid, ppvObj);

    *ppvObj = NULL;
    return E_NOINTERFACE;
}

HRESULT CSafeServiceSite::SetProviderWeakRef(IServiceProvider *psp)
{
    _psp = psp;
    return S_OK;
}