在COM接口的Vtable中查找特定函數的索引

Question

我正在嘗試在DirectDraw對象中掛鈎SetCooperativeLevel函數。 我的目標非常類似於這個問題API鈎子上的COM對象函數？ 但唯一的問題是我不知道IDirectDraw的SetCooperativeLevel的vtable中的確切偏移量。 無論如何要從<ddraw.h>或以編程方式收集這些內容？

這是IDirectDraw的接口聲明，但是我不確定它是如何對應於vtable的。

DECLARE_INTERFACE_( IDirectDraw, IUnknown )
{
    STDMETHOD(QueryInterface) (THIS_ REFIID riid, LPVOID FAR * ppvObj) PURE;
    STDMETHOD_(ULONG,AddRef) (THIS)  PURE;
    STDMETHOD_(ULONG,Release) (THIS) PURE;
    STDMETHOD(Compact)(THIS) PURE;
    STDMETHOD(CreateClipper)(THIS_ DWORD, LPDIRECTDRAWCLIPPER FAR*, IUnknown FAR * ) PURE;
    STDMETHOD(CreatePalette)(THIS_ DWORD, LPPALETTEENTRY, LPDIRECTDRAWPALETTE FAR*, IUnknown FAR * ) PURE;
    STDMETHOD(CreateSurface)(THIS_  LPDDSURFACEDESC, LPDIRECTDRAWSURFACE FAR *, IUnknown FAR *) PURE;
    STDMETHOD(DuplicateSurface)( THIS_ LPDIRECTDRAWSURFACE, LPDIRECTDRAWSURFACE FAR * ) PURE;
    STDMETHOD(EnumDisplayModes)( THIS_ DWORD, LPDDSURFACEDESC, LPVOID, LPDDENUMMODESCALLBACK ) PURE;
    STDMETHOD(EnumSurfaces)(THIS_ DWORD, LPDDSURFACEDESC, LPVOID,LPDDENUMSURFACESCALLBACK ) PURE;
    STDMETHOD(FlipToGDISurface)(THIS) PURE;
    STDMETHOD(GetCaps)( THIS_ LPDDCAPS, LPDDCAPS) PURE;
    STDMETHOD(GetDisplayMode)( THIS_ LPDDSURFACEDESC) PURE;
    STDMETHOD(GetFourCCCodes)(THIS_  LPDWORD, LPDWORD ) PURE;
    STDMETHOD(GetGDISurface)(THIS_ LPDIRECTDRAWSURFACE FAR *) PURE;
    STDMETHOD(GetMonitorFrequency)(THIS_ LPDWORD) PURE;
    STDMETHOD(GetScanLine)(THIS_ LPDWORD) PURE;
    STDMETHOD(GetVerticalBlankStatus)(THIS_ LPBOOL ) PURE;
    STDMETHOD(Initialize)(THIS_ GUID FAR *) PURE;
    STDMETHOD(RestoreDisplayMode)(THIS) PURE;
    STDMETHOD(SetCooperativeLevel)(THIS_ HWND, DWORD) PURE;    // I'm trying to hook this
    STDMETHOD(SetDisplayMode)(THIS_ DWORD, DWORD,DWORD) PURE;
    STDMETHOD(WaitForVerticalBlank)(THIS_ DWORD, HANDLE ) PURE;
};

Answer 1

回答我自己的問題：vtable的布局方式與聲明接口函數的順序完全相同。