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Under GNU General Public License
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xcb_query_tree(3) XCB Requests xcb_query_tree(3)
NAME
xcb_query_tree - query the window tree
SYNOPSIS
#include <xcb/xproto.h>
Request function
xcb_query_tree_cookie_t xcb_query_tree(xcb_connection_t *conn, xcb_window_t window);
Reply datastructure
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;
Reply function
xcb_query_tree_reply_t *xcb_query_tree_reply(xcb_connection_t *conn,
xcb_query_tree_cookie_t cookie, xcb_generic_error_t **e);
Reply accessors
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);
REQUEST ARGUMENTS
conn The XCB connection to X11.
window The window to query.
REPLY FIELDS
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 oth-
er.
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.
DESCRIPTION
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.
RETURN VALUE
Returns an xcb_query_tree_cookie_t. Errors have to be handled when calling the reply func-
tion 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.
ERRORS
This request does never generate any errors.
EXAMPLE
/*
* 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);
}
}
SEE ALSO
xcb-requests(3), xcb-examples(3), xwininfo(1)
AUTHOR
Generated from xproto.xml. Contact xcb AT lists.org for corrections and improve-
ments.
X Version 11 libxcb 1.13 xcb_query_tree(3)
Generated by $Id: phpMan.php,v 4.55 2007/09/05 04:42:51 chedong Exp $ Author: Che Dong
On Apache
Under GNU General Public License
2024-04-27 08:05 @18.222.69.152 CrawledBy Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.com)