Windows下对游戏杆编程(4)

介绍游戏杆的编程

DWORD dwZpos; /* z position */

DWORD dwRpos; /* rudder/4th axis position */

DWORD dwUpos; /* 5th axis position */

DWORD dwVpos; /* 6th axis position */

DWORD dwButtons; /* button states */

DWORD dwButtonNumber; /* current button number pressed */

DWORD dwPOV; /* point of view state */

DWORD dwReserved1;

DWORD dwReserved2;

} JOYINFOEX, *PJOYINFOEX, NEAR *NPJOYINFOEX, FAR *LPJOYINFOEX;

使用此函数前要先通过设置pji->dwFlags的值来指定要返回的值，否则很可能会得不到想要的信息，我因为没注意这点而郁闷了很久。dwFlags的值可用下列预定义常数来设置：

#define JOY_RETURNX 0x00000001l

#define JOY_RETURNY 0x00000002l

#define JOY_RETURNZ 0x00000004l

#define JOY_RETURNR 0x00000008l

#define JOY_RETURNU 0x00000010l /* axis 5 */

#define JOY_RETURNV 0x00000020l /* axis 6 */

#define JOY_RETURNPOV 0x00000040l

#define JOY_RETURNBUTTONS 0x00000080l

#define JOY_RETURNRAWDATA 0x00000100l

#define JOY_RETURNPOVCTS 0x00000200l

#define JOY_RETURNCENTERED 0x00000400l