XQueryTree - Online Linux Manual PageSection : 3
Updated : libX11 1.8.4
Source : X Version 11
Note : XLIB FUNCTIONS
NAMEXQueryTree − query window tree information
SYNTAXStatus XQueryTree ( Display *display , Window w , Window *root_return , Window *parent_return , Window **children_return , unsigned int *nchildren_return );
ARGUMENTSchildren_return Returns the list of children. display Specifies the connection to the X server. nchildren_return Returns the number of children. parent_return Returns the parent window. root_return Returns the root window. w Specifies the window whose list of children, root, parent, and number of children you want to obtain.
DESCRIPTIONThe XQueryTree function returns the root ID, the parent window ID, a pointer to the list of children windows (NULL when there are no children), and the number of children in the list for the specified window. The children are listed in current stacking order, from bottom-most (first) to top-most (last). XQueryTree returns zero if it fails and nonzero if it succeeds. To free a non-NULL children list when it is no longer needed, use XFree. XQueryTree can generate a BadWindow error.
BUGSThis really should return a screen *, not a root window ID.
DIAGNOSTICSBadWindow A value for a Window argument does not name a defined Window.
SEE ALSOXFree(3), XGetWindowAttributes(3), XQueryPointer(3)
Xlib − C Language X Interface 0
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