typedef struct _TBBUTTON {
    int iBitmap;
    int idCommand;
    BYTE fsState;
    BYTE fsStyle;
#ifdef _WIN64
    BYTE bReserved[6];          
#elif defined(_WIN32)
    BYTE bReserved[2];          
#endif
    DWORD_PTR dwData;
    INT_PTR iString;
} TBBUTTON, NEAR* PTBBUTTON, *LPTBBUTTON;