xcb_query_tree - query the window tree

       Generated from xproto.xml. Contact xcb@lists.freedesktop.org for corrections and improvements.

X Version 11                                      libxcb 1.17.0                                xcb_query_tree(3)

       Gets the root window ID, parent window ID and list of children windows  for  the  specified  window.  The
       children are listed in bottom-to-top stacking order.

       This request does never generate any errors.

       /*
        * Displays the root, parent and children of the specified window.
        *
        */
       void my_example(xcb_connection_t *conn, xcb_window_t window) {
           xcb_query_tree_cookie_t cookie;
           xcb_query_tree_reply_t *reply;

           cookie = xcb_query_tree(conn, window);
           if ((reply = xcb_query_tree_reply(conn, cookie, NULL))) {
               printf("root = 0x%08x\n", reply->root);
               printf("parent = 0x%08x\n", reply->parent);

               xcb_window_t *children = xcb_query_tree_children(reply);
               for (int i = 0; i < xcb_query_tree_children_length(reply); i++)
                   printf("child window = 0x%08x\n", children[i]);

               free(reply);
           }
       }

       xcb_query_tree - query the window tree

response_type
                 The  type  of  this  reply,  in  this  case  XCB_QUERY_TREE.  This field is also present in the
                 xcb_generic_reply_t and can be used to tell replies apart from each other.

       sequence  The sequence number of the last request processed by the X11 server.

       length    The length of the reply, in words (a word is 4 bytes).

       root      The root window of window.

       parent    The parent window of window.

       children_len
                 The number of child windows.

conn      The XCB connection to X11.

       window    The window to query.

       Returns  an  xcb_query_tree_cookie_t.  Errors  have  to  be  handled  when  calling  the  reply  function
       xcb_query_tree_reply.

       If you want to handle errors in the event loop instead, use xcb_query_tree_unchecked. See xcb-requests(3)
       for details.

xcb-requests(3), xcb-examples(3), xwininfo(1)

#include<xcb/xproto.h>Requestfunction

       xcb_query_tree_cookie_t xcb_query_tree(xcb_connection_t *conn, xcb_window_t window);

   Replydatastructure
       typedef struct xcb_query_tree_reply_t {
           uint8_t      response_type;
           uint8_t      pad0;
           uint16_t     sequence;
           uint32_t     length;
           xcb_window_t root;
           xcb_window_t parent;
           uint16_t     children_len;
           uint8_t      pad1[14];
       } xcb_query_tree_reply_t;

   Replyfunction

       xcb_query_tree_reply_t *xcb_query_tree_reply(xcb_connection_t *conn, xcb_query_tree_cookie_t cookie,
              xcb_generic_error_t **e);

   Replyaccessors

       xcb_window_t *xcb_query_tree_children(const xcb_query_tree_request_t *reply);

       int xcb_query_tree_children_length(const xcb_query_tree_reply_t *reply);

       xcb_generic_iterator_t xcb_query_tree_children_end(const xcb_query_tree_reply_t *reply);