windows-server-2003/inetcore/outlookexpress/acctreg/factory.cpp

// --------------------------------------------------------------------------------
// Factory.cpp
// --------------------------------------------------------------------------------
#include <windows.h>
#include <ole2.h>
#include "dllmain.h"
#include "acctreg.h"
#include "guids.h"

////////////////////////////////////////////////////////////////////////
//
//  IClassFactory implementation
//
////////////////////////////////////////////////////////////////////////
class CClassFactory : public IClassFactory
{
public:
    CClassFactory(REFCLSID clsid) : m_cRef(1), m_clsid(clsid) { DllAddRef(); }
    ~CClassFactory() { DllRelease(); }

    // IUnknown
    HRESULT STDMETHODCALLTYPE QueryInterface(REFIID riid, void **ppvObject);
    ULONG   STDMETHODCALLTYPE AddRef(void);
    ULONG   STDMETHODCALLTYPE Release(void);

    // IClassFactory
    HRESULT STDMETHODCALLTYPE CreateInstance(IUnknown *punkOuter, REFIID riid, LPVOID *ppv);
    HRESULT STDMETHODCALLTYPE LockServer(BOOL fLock);

private:
    UINT    m_cRef;
    CLSID   m_clsid;
};


HRESULT STDMETHODCALLTYPE CClassFactory::QueryInterface(REFIID riid, void **ppvObject)
{
    if (!ppvObject)
        return E_INVALIDARG;

    *ppvObject = NULL;

    if (IsEqualIID(riid, IID_IClassFactory) || IsEqualIID(riid, IID_IUnknown))
        {
        *ppvObject = (IClassFactory *)this;
        }
    else
        return E_NOINTERFACE;

    AddRef();
    return S_OK;
}

ULONG STDMETHODCALLTYPE CClassFactory::AddRef(void)
{
    return ++m_cRef;
}

ULONG STDMETHODCALLTYPE CClassFactory::Release(void)
{
    if (--m_cRef > 0)
        return m_cRef;

    delete this;
    return 0;
}

HRESULT STDMETHODCALLTYPE CClassFactory::CreateInstance(IUnknown *punkOuter, REFIID riid, LPVOID *ppv)
{
    HRESULT     hr;

    if (!ppv)
        return E_INVALIDARG;

    *ppv = NULL;  // assume error

    if (punkOuter)
        return CLASS_E_NOAGGREGATION;       // don't support aggregation


    if (IsEqualCLSID(m_clsid, CLSID_AcctReg))
        {
        // make sure we're the IMsgBox class factory
        CAcctReg *pAcctReg;

        if (pAcctReg = new CAcctReg())
            {
            hr = pAcctReg->QueryInterface(riid, ppv);
            // Note that the Release member will free the object, if QueryInterface
            // failed.
            pAcctReg->Release();
            }
        else
            {
            hr = E_OUTOFMEMORY;
            }
        }
    else
        {
        hr = E_NOINTERFACE;
        }

    return hr;
}

HRESULT STDMETHODCALLTYPE CClassFactory::LockServer(BOOL fLock)
{
    return E_NOTIMPL;
}




// --------------------------------------------------------------------------------
// DllGetClassObject
// --------------------------------------------------------------------------------
STDAPI DllGetClassObject(REFCLSID rclsid, REFIID riid, LPVOID *ppv)
{
    HRESULT     hr;

    if (ppv == NULL)
        return E_INVALIDARG;

    if (IsEqualCLSID(rclsid, CLSID_AcctReg))
        {
        // caller want the class factory that can handout msgbox
        // objects...
        CClassFactory *pcf = new CClassFactory(rclsid);
        
        if (pcf)
            {
            hr = pcf->QueryInterface(riid, ppv);
            pcf->Release();
            }
        else
            hr = E_OUTOFMEMORY;    
        }
    else
        hr = CLASS_E_CLASSNOTAVAILABLE;

    return hr;
}