context-menu-shell-extension/ClassFactory.cpp at master · freebug/context-menu-shell-extension · GitHub

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#include "ClassFactory.h"
#include "ContextMenu.h"
#include <Shlwapi.h>
#pragma comment(lib, "shlwapi.lib")

extern long g_cDllRef;

ClassFactory::ClassFactory() : m_cRef(1)
{
    InterlockedIncrement(&g_cDllRef);
}

ClassFactory::~ClassFactory()
{
    InterlockedDecrement(&g_cDllRef);
}

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

IFACEMETHODIMP_(ULONG) ClassFactory::AddRef()
{
    return InterlockedIncrement(&m_cRef);
}

IFACEMETHODIMP_(ULONG) ClassFactory::Release()
{
    ULONG cRef = InterlockedDecrement(&m_cRef);
    if (0 == cRef)
    {
        delete this;
    }
    return cRef;
}


IFACEMETHODIMP ClassFactory::CreateInstance(IUnknown *pUnkOuter, REFIID riid, void **ppv)
{
    HRESULT hr = E_OUTOFMEMORY;

	// Create the COM component.
	ContextMenu *pExt = new (std::nothrow) ContextMenu();
	if (pExt)
	{
		// Query the specified interface.
		hr = pExt->QueryInterface(riid, ppv);
		pExt->Release();
	}

    return hr;
}

IFACEMETHODIMP ClassFactory::LockServer(BOOL fLock)
{
    if (fLock)
        InterlockedIncrement(&g_cDllRef);
    else
        InterlockedDecrement(&g_cDllRef);

    return S_OK;
}