Bool XQueryPointer(display, w, root_return, child_return, root_x_return, root_y_return,
win_x_return, win_y_return, mask_return)
Display *display;
Window w;
Window *root_return, *child_return;
int *root_x_return, *root_y_return;
int *win_x_return, *win_y_return;
unsigned int *mask_return;
| display | Specifies the connection to the X server. |
| w | Specifies the window. |
| root_return | Returns the root window that the pointer is in. |
| child_return | Returns the child window that the pointer is located in, if any. |
| root_x_return root_y_return | Return the pointer coordinates relative to the root window's origin. |
| win_x_return win_y_return | Return the pointer coordinates relative to the specified window. |
| mask_return | Returns the current state of the modifier keys and pointer buttons. |
XQueryPointer() returns the current logical state of the keyboard buttons and the modifier keys in mask_return. It sets mask_return to the bitwise inclusive OR of one or more of the button or modifier key bitmasks to match the current state of the mouse buttons and the modifier keys.
Note that the logical state of a device (as seen through Xlib) may lag the physical state if device event processing is frozen (see "Pointer Grabbing").
XQueryPointer() can generate a BadWindow error.
| BadWindow | A value for a Window argument does not name a defined Window. |