SwapAPO COM接口关系图

总目录为SwapAPODlllib，其UUIP定义为：

// SwapAPODlllib
//
[
    uuid(7092F0B2-D28D-4095-95A7-6C37A97432A2),
    version(1.0)
]

其包含2个COM类，分别为SFX和MFX

library SwapAPODlllib
{
    importlib("stdole2.tlb");

    // for Swap APO - MFX
    [
        uuid(06687E71-F043-403A-BF49-CB591BA6E103)
    ]
    coclass SwapAPOMFX
    {
        interface IAudioProcessingObject;
        interface IAudioProcessingObjectRT;
        interface IAudioProcessingObjectConfiguration;
        interface IMMNotificationClient;
        interface IAudioSystemEffects;
        [default] interface ISwapAPOMFX;
    };

    // for Swap APO - SFX
    [
        uuid(B48DEA3F-D962-425a-8D9A-9A5BB37A9904)
    ]
    coclass SwapAPOSFX
    {
        interface IAudioProcessingObject;
        interface IAudioProcessingObjectRT;
        interface IAudioProcessingObjectConfiguration;
        interface IMMNotificationClient;
        interface IAudioSystemEffects;
        [default] interface ISwapAPOSFX;
    };
}

注意，看到，两个SFX和MFX的默认接口分别为ISwapAPOSFX和ISwapAPOMFX。其分别定义为：

// This is the SwapAPO interface.
[
    object,
    uuid(3865B91A-096E-4ACA-BF56-B17D49C77406),
    pointer_default(unique)
]
interface ISwapAPOMFX : IUnknown
{
};

// This is the SwapAPO interface.
[
    object,
    uuid(658A4077-B277-4d14-97E1-0356044D8110),
    pointer_default(unique)
]
interface ISwapAPOSFX : IUnknown
{
};

这可通过SwapAPOInterface.h定义验证，其路径为：

E:\Windows-driver-samples-master\Windows-driver-samples-master\audio\sysvad\APO\SwapAPO\x64\Release\SwapAPOInterface.h

• IID_ISwapAPOSFX:

EXTERN_C const IID IID_ISwapAPOSFX;

#if defined(__cplusplus) && !defined(CINTERFACE)

    MIDL_INTERFACE("658A4077-B277-4d14-97E1-0356044D8110")
    ISwapAPOSFX : public IUnknown
    {
    public:
    };

• IID_ISwapAPOMFX

EXTERN_C const IID IID_ISwapAPOMFX;

#if defined(__cplusplus) && !defined(CINTERFACE)

    MIDL_INTERFACE("3865B91A-096E-4ACA-BF56-B17D49C77406")
    ISwapAPOMFX : public IUnknown
    {
    public:
    };


#else     /* C style interface */