143 lines
3.1 KiB
C
143 lines
3.1 KiB
C
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#if !defined(_FUSION_INC_GITCOOKIE_H_INCLUDED_)
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#define _FUSION_INC_GITCOOKIE_H_INCLUDED_
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#pragma once
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#include <objidl.h>
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template <class TInterface> class CGITCookie
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{
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public:
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CGITCookie() : m_dwCookie(0), m_fSet(false) { }
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~CGITCookie()
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{
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HRESULT hr;
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IGlobalInterfaceTable *pGIT = NULL;
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// In debug builds, always create the GIT. This is slower, but will find code
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// paths which are destroying CGITCookie instances after COM is uninitialized
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// for the thread.
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#if DBG
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hr = this->GetGIT(&pGIT);
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ASSERT(SUCCEEDED(hr));
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if (SUCCEEDED(hr))
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{
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if (m_fSet)
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{
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hr = pGIT->RevokeInterfaceFromGlobal(m_dwCookie);
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ASSERT(SUCCEEDED(hr));
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m_fSet = false;
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}
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pGIT->Release();
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}
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#else
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if (m_fSet)
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{
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hr = this->GetGIT(&pGIT);
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if (SUCCEEDED(hr))
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{
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(VOID) pGIT->RevokeInterfaceFromGlobal(m_dwCookie);
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}
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m_fSet = false;
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}
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#endif
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}
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HRESULT Set(TInterface *pt)
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{
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IGlobalInterfaceTable *pGIT = NULL;
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DWORD dwCookieTemp = 0;
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bool fTempCookieNeedsToBeFreed = false;
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HRESULT hr = this->GetGIT(&pGIT);
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if (FAILED(hr))
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goto Exit;
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if (pt != NULL)
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{
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hr = pGIT->RegisterInterfaceInGlobal(pt, __uuidof(TInterface), &dwCookieTemp);
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if (FAILED(hr))
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goto Exit;
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fTempCookieNeedsToBeFreed = true;
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}
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if (m_fSet)
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{
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hr = pGIT->RevokeInterfaceFromGlobal(m_dwCookie);
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if (FAILED(hr))
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goto Exit;
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m_fSet = false;
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}
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if (pt != NULL)
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{
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m_dwCookie = dwCookieTemp;
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m_fSet = true;
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fTempCookieNeedsToBeFreed = false;
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}
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hr = NOERROR;
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Exit:
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if (fTempCookieNeedsToBeFreed)
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pGIT->RevokeInterfaceFromGlobal(dwCookieTemp);
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return hr;
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}
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HRESULT Get(TInterface **ppt)
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{
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HRESULT hr = NOERROR;
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IGlobalInterfaceTable *pGIT = NULL;
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ASSERT(ppt != NULL);
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if (ppt == NULL)
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{
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hr = E_INVALIDARG;
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goto Exit;
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}
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// How can you get if you haven't set?
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ASSERT(m_fSet);
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if (!m_fSet)
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{
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hr = E_UNEXPECTED;
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goto Exit;
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}
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ASSERT((*ppt) == NULL);
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hr = this->GetGIT(&pGIT);
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if (FAILED(hr))
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goto Exit;
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hr = pGIT->GetInterfaceFromGlobal(m_dwCookie, __uuidof(TInterface), (LPVOID *) ppt);
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if (FAILED(hr))
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goto Exit;
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hr = NOERROR;
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Exit:
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if (pGIT != NULL)
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pGIT->Release();
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return hr;
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}
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private:
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HRESULT GetGIT(IGlobalInterfaceTable **ppGIT)
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{
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return ::CoCreateInstance(
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CLSID_StdGlobalInterfaceTable,
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NULL,
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CLSCTX_INPROC_SERVER,
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IID_IGlobalInterfaceTable,
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(LPVOID *) ppGIT);
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}
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DWORD m_dwCookie;
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bool m_fSet;
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};
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#endif
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