Manpages - XIQueryPointer.3

XIQueryPointer - get device pointer coordinates.

  #include <X11/extensions/XInput2.h>

  Bool XIQueryPointer( Display *display,
                       int deviceid,
                       Window win,
                       Window *root_return,
                       Window *child_return,
                       double *root_x_return,
                       double *root_y_return,
                       double *win_x_return,
                       double *win_y_return,
                       XIButtonState *buttons_return,
                       XIModifierState *modifiers_return,
                       XIGroupState *group_return);

  buttons_return
         Returns the current button state.

  child_return
         Returns the child window that the pointer is located in,
         if any.

  deviceid
         Specifies the device to query.

  display
         Specifies the connection to the X server.

  group_return
         Returns the current group state.

  modifiers_return
         Returns the current state of the modifier keys.

  root_return
         Returns the root window that the pointer is in.

  root_x_return, root_y_return
         Return the pointer coordinates relative to the root
         windows origin.

  win
         Specifies the window.

  win_x_return, win_y_return
         Return the pointer coordinates relative to the specified
         window.

    The XIQueryPointer function returns the root window the
    devices pointer is logically on and the pointer coordinates
    relative to the root windows origin. If XIQueryPointer returns
    False, the pointer is not on the same screen as the specified
    window, and XIQueryPointer returns None to child_return and
    zero to win_x_return and win_y_return. If XIQueryPointer
    returns True, the pointer coordinates returned to win_x_return
    and win_y_return are relative to the origin of the specified
    window. In this case, XIQueryPointer returns the child that
    contains the pointer, if any, or else None to child_return.

    XIQueryPointer returns the current logical state of the buttons
    buttons_return. The keyboard paired with the master pointer is
    selected to obtain the data for modifiers_return and
    group_return.

    The mask field in buttons_return is dynamically allocated and
    must be freed by the caller.

    XIQueryPointer is identical to XQueryPointer but specifies the
    device explicitly.

    XIQueryPointer can generate a BadDevice and a BadWindow error.

    BadDevice
           An invalid device was specified. The device does not
           exist or is not a pointer device.

    BadWindow
           A value for a Window argument does not name a defined
           window.

    XQueryPointer(3)