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Describes the state of a joystick device. This structure is used with the IDirectInputDevice8::GetDeviceState method.


typedef struct DIJOYSTATE {
    LONG lX;
    LONG lY;
    LONG lZ;
    LONG lRx;
    LONG lRy;
    LONG lRz;
    LONG rglSlider[2];
    DWORD rgdwPOV[4];
    BYTE rgbButtons[32];


  • lX
    X-axis, usually the left-right movement of a stick.
  • lY
    Y-axis, usually the forward-backward movement of a stick.
  • lZ
    Z-axis, often the throttle control. If the joystick does not have this axis, the value is 0.
  • lRx
    X-axis rotation. If the joystick does not have this axis, the value is 0.
  • lRy
    Y-axis rotation. If the joystick does not have this axis, the value is 0.
  • lRz
    Z-axis rotation (often called the rudder). If the joystick does not have this axis, the value is 0.
  • rglSlider
    Two additional axes, formerly called the u-axis and v-axis, whose semantics depend on the joystick. Use the IDirectInputDevice8::GetObjectInfo method to obtain semantic information about these values.
  • rgdwPOV
    Direction controllers, such as point-of-view hats. The position is indicated in hundredths of a degree clockwise from north (away from the user). The center position is normally reported as - 1; but see Remarks. For indicators that have only five positions, the value for a controller is - 1, 0, 9,000, 18,000, or 27,000.
  • rgbButtons
    Array of buttons. The high-order bit of the byte is set if the corresponding button is down, and clear if the button is up or does not exist.


You must prepare the device for joystick-style access by calling the IDirectInputDevice8::SetDataFormat method, passing the c_dfDIJoystick global data format variable.

If an axis is in relative mode, the appropriate member contains the change in position. If it is in absolute mode, the member contains the absolute axis position.

Some drivers report the centered position of the POV indicator as 65,535. Determine whether the indicator is centered as follows:

BOOL POVCentered = (LOWORD(dwPOV) == 0xFFFF);


Under DirectX 7.0, sliders on some joysticks could be assigned to the Z axis, with subsequent code retrieving data from that member. Using DirectX 8.0 and later, those same sliders will be assigned to the rglSlider array. This should be taken into account when porting applications to later versions of DirectX. Make any necessary alterations to ensure that slider data is retrieved from the rglSlider array.

See Also