Windows编程

开发平台：
Visual C++

FACTORY.CPP：源码内容
							/**************************************************************************
 *
 *  THIS CODE AND INFORMATION IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY
 *  KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
 *  IMPLIED WARRANTIES OF MERCHANTABILITY AND/OR FITNESS FOR A PARTICULAR
 *  PURPOSE.
 *
 *  Copyright (C) 1992 - 1997 Microsoft Corporation.  All Rights Reserved.
 *
 **************************************************************************/
#define _INC_OLE
#include <windows.h>
#include <windowsx.h>
#include <mmsystem.h>
#include <string.h>
#include <ole2.h>
#define INITGUID
#include <initguid.h>
// Bring in the external GUIDs we need....
//DEFINE_OLEGUID(IID_IUnknown,            0x00000000L, 0, 0);
//DEFINE_OLEGUID(IID_IClassFactory,       0x00000001L, 0, 0);
//DEFINE_OLEGUID(IID_IMarshal,            0x00000003L, 0, 0);
#include <vfw.h>
#include "handler.h"
HMODULE ghModule = NULL;        // global HMODULE/HINSTANCE for resource access
/*      -       -       -       -       -       -       -       -       */
EXTERN_C BOOL APIENTRY DllMain(HANDLE, DWORD, LPVOID);
EXTERN_C BOOL APIENTRY DllMain(
HANDLE hModule,
DWORD dwReason,
LPVOID lpReserved )
{
        switch( dwReason)
        {
                case DLL_PROCESS_ATTACH:
                        if(ghModule == NULL)
                                ghModule = (HMODULE)hModule;
                        break;
                case DLL_THREAD_ATTACH:
                        break;
                case DLL_THREAD_DETACH:
                        break;
                case DLL_PROCESS_DETACH:
                        break;
        }
        return TRUE;
}
/*      -       -       -       -       -       -       -       -       */
EXTERN_C BOOL FAR PASCAL WEP(
        BOOL    fSystemExit)
{
        return TRUE;
}
/*      -       -       -       -       -       -       -       -       */
STDAPI DllCanUnloadNow(
        void)
{
        return ResultFromScode((fLocked || uUseCount) ? S_FALSE : S_OK);
}
/*      -       -       -       -       -       -       -       -       */
STDAPI DllGetClassObject(
        const CLSID FAR&        rclsid,
        const IID FAR&  riid,
        void FAR* FAR*  ppv)
{
        HRESULT hresult;
        hresult = CAVIFileCF::Create(rclsid, riid, ppv);
        return hresult;
}
/*      -       -       -       -       -       -       -       -       */
HRESULT CAVIFileCF::Create(
        const CLSID FAR&        rclsid,
        const IID FAR&  riid,
        void FAR* FAR*  ppv)
{
        CAVIFileCF FAR* pAVIFileCF;
        IUnknown FAR*   pUnknown;
        HRESULT hresult;
        pAVIFileCF = new FAR CAVIFileCF(rclsid, &pUnknown);
        if (pAVIFileCF == NULL)
                return ResultFromScode(E_OUTOFMEMORY);
        hresult = pUnknown->QueryInterface(riid, ppv);
        if (FAILED(GetScode(hresult)))
                delete pAVIFileCF;
        return hresult;
}
/*      -       -       -       -       -       -       -       -       */
CAVIFileCF::CAVIFileCF(
        const CLSID FAR&        rclsid,
        IUnknown FAR* FAR*      ppUnknown)
{
        m_clsid = rclsid;
        m_refs = 0;
        *ppUnknown = this;
}
/*      -       -       -       -       -       -       -       -       */
STDMETHODIMP CAVIFileCF::QueryInterface(
        const IID FAR&  iid,
        void FAR* FAR*  ppv)
{
        if (iid == IID_IUnknown)
                *ppv = this;
        else if (iid == IID_IClassFactory)
                *ppv = this;
        else
                return ResultFromScode(E_NOINTERFACE);
        AddRef();
        return NULL;
}
/*      -       -       -       -       -       -       -       -       */
STDMETHODIMP_(ULONG) CAVIFileCF::AddRef()
{
        return ++m_refs;
}
/*      -       -       -       -       -       -       -       -       */
STDMETHODIMP_(ULONG) CAVIFileCF::Release()
{
        if (!--m_refs) {
                delete this;
                return 0;
        }
        return m_refs;
}
/*      -       -       -       -       -       -       -       -       */
STDMETHODIMP CAVIFileCF::CreateInstance(
        IUnknown FAR*   pUnknownOuter,
        const IID FAR&  riid,
        void FAR* FAR*  ppv)
{
        HRESULT hresult;
        // Actually create a real object using the CAVIFile class....
        // !!! We should really make sure they're using IAVIFile or IMarshal!
        if (m_clsid == CLSID_DIBSEQFileReader) {
                hresult = CAVIFile::Create(pUnknownOuter, riid, ppv);
                return hresult;
        } else {
                return ResultFromScode(E_UNEXPECTED);
        }
}
/*      -       -       -       -       -       -       -       -       */
STDMETHODIMP CAVIFileCF::LockServer(
        BOOL    fLock)
{
        fLocked = fLock;
        return NULL;
}
/*      -       -       -       -       -       -       -       -       */

						