This message is sent to the window that has captured joystick 1 when the joystick position changes.
WORD wParam
Indicates which joystick buttons are pressed. It can be any combination of the following values:
JOY_BUTTON1
Set if first joystick button is pressed.
JOY_BUTTON2
Set if second joystick button is pressed.
JOY_BUTTON3
Set if third joystick button is pressed.
JOY_BUTTON4
Set if fourth joystick button is pressed.
DWORD lParam
The low-order word contains the current x-position of the joystick. The high-order word contains the current y-position.
None
MM_JOY1ZMOVE