1、设置MFC链接库。Project\Setting\General\Using MFC in a shared Dll

2、加载已有的动态链接库文件 *.LIB文件。

3、在头文件中加入

#ifdef IFR_API
#else
#define IFR_API __declspec(dllimport) __stdcall
#endif

在.cpp文件中加入一下代码：

#define IFR_API __declspec(dllexport) __stdcall

例程：

如果封装IDirectDrawSurface成为结构体非常麻烦，封装为新的dll文件可节省很多时间和精力。

typedef struct IDirectDrawSurface   FAR *LPDIRECTDRAWSURFACE;

int IFR_API IFR_GetDrawBuffer1(HANDLE hHandle, void *pIfr)
{
   LPDIRECTDRAWSURFACE lp;
   return IFR_GetDrawBuffer(hHandle, pIfr, &lp);
};

DECLARE_INTERFACE_( IDirectDrawSurface, IUnknown )
{
    /*** IUnknown methods ***/
    STDMETHOD(QueryInterface) (THIS_ REFIID riid, LPVOID FAR * ppvObj) PURE;
    STDMETHOD_(ULONG,AddRef) (THIS) PURE;
    STDMETHOD_(ULONG,Release) (THIS) PURE;
    /*** IDirectDrawSurface methods ***/
    STDMETHOD(AddAttachedSurface)(THIS_ LPDIRECTDRAWSURFACE) PURE;
    STDMETHOD(AddOverlayDirtyRect)(THIS_ LPRECT) PURE;
    STDMETHOD(Blt)(THIS_ LPRECT,LPDIRECTDRAWSURFACE, LPRECT,DWORD, LPDDBLTFX) PURE;
    STDMETHOD(BltBatch)(THIS_ LPDDBLTBATCH, DWORD, DWORD ) PURE;
    STDMETHOD(BltFast)(THIS_ DWORD,DWORD,LPDIRECTDRAWSURFACE, LPRECT,DWORD) PURE;
    STDMETHOD(DeleteAttachedSurface)(THIS_ DWORD,LPDIRECTDRAWSURFACE) PURE;
    STDMETHOD(EnumAttachedSurfaces)(THIS_ LPVOID,LPDDENUMSURFACESCALLBACK) PURE;
    STDMETHOD(EnumOverlayZOrders)(THIS_ DWORD,LPVOID,LPDDENUMSURFACESCALLBACK) PURE;
    STDMETHOD(Flip)(THIS_ LPDIRECTDRAWSURFACE, DWORD) PURE;
    STDMETHOD(GetAttachedSurface)(THIS_ LPDDSCAPS, LPDIRECTDRAWSURFACE FAR *) PURE;
    STDMETHOD(GetBltStatus)(THIS_ DWORD) PURE;
    STDMETHOD(GetCaps)(THIS_ LPDDSCAPS) PURE;
    STDMETHOD(GetClipper)(THIS_ LPDIRECTDRAWCLIPPER FAR*) PURE;
    STDMETHOD(GetColorKey)(THIS_ DWORD, LPDDCOLORKEY) PURE;
    STDMETHOD(GetDC)(THIS_ HDC FAR *) PURE;
    STDMETHOD(GetFlipStatus)(THIS_ DWORD) PURE;
    STDMETHOD(GetOverlayPosition)(THIS_ LPLONG, LPLONG ) PURE;
    STDMETHOD(GetPalette)(THIS_ LPDIRECTDRAWPALETTE FAR*) PURE;
    STDMETHOD(GetPixelFormat)(THIS_ LPDDPIXELFORMAT) PURE;
    STDMETHOD(GetSurfaceDesc)(THIS_ LPDDSURFACEDESC) PURE;
    STDMETHOD(Initialize)(THIS_ LPDIRECTDRAW, LPDDSURFACEDESC) PURE;
    STDMETHOD(IsLost)(THIS) PURE;
    STDMETHOD(Lock)(THIS_ LPRECT,LPDDSURFACEDESC,DWORD,HANDLE) PURE;
    STDMETHOD(ReleaseDC)(THIS_ HDC) PURE;
    STDMETHOD(Restore)(THIS) PURE;
    STDMETHOD(SetClipper)(THIS_ LPDIRECTDRAWCLIPPER) PURE;
    STDMETHOD(SetColorKey)(THIS_ DWORD, LPDDCOLORKEY) PURE;
    STDMETHOD(SetOverlayPosition)(THIS_ LONG, LONG ) PURE;
    STDMETHOD(SetPalette)(THIS_ LPDIRECTDRAWPALETTE) PURE;
    STDMETHOD(Unlock)(THIS_ LPVOID) PURE;
    STDMETHOD(UpdateOverlay)(THIS_ LPRECT, LPDIRECTDRAWSURFACE,LPRECT,DWORD, LPDDOVERLAYFX) PURE;
    STDMETHOD(UpdateOverlayDisplay)(THIS_ DWORD) PURE;
    STDMETHOD(UpdateOverlayZOrder)(THIS_ DWORD, LPDIRECTDRAWSURFACE) PURE;
};