Creating an Object Pointer

AVIBall uses the following structure as its object pointer. The first member of this structure points to the virtual function table that AVIBall uses to access its functions. Applications can cast this structure to the PAVISTREAM data type. Methods that use the PAVISTREAM data type use only the pointer to the virtual function table. The members following the pointer to the virtual function table are used internally by AVIBall.

typedef struct

{

IAVIStreamVtbl FAR * lpvtbl;

// Ball instance data.

ULONG ulRefCount;

DWORD fccType; // is this audio/video?

int width; // size, in pixels, of each frame

int height;

int length; // length, in frames

int size;

COLORREF color; // ball color

} AVIBALL, FAR * PAVIBALL;

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