xcb_change_property(3) XCB Requests xcb_change_property(3)NAME
xcb_change_property - Changes a window property
SYNOPSIS
#include <xcb/xproto.h>
Request function
xcb_void_cookie_t xcb_change_property(xcb_connection_t *conn,
uint8_t mode, xcb_window_t window, xcb_atom_t property,
xcb_atom_t type, uint8_t format, uint32_t data_len, const
void *data);
REQUEST ARGUMENTS
conn The XCB connection to X11.
mode One of the following values:
XCB_PROP_MODE_REPLACE
Discard the previous property value and store the
new data.
XCB_PROP_MODE_PREPEND
Insert the new data before the beginning of exist‐
ing data. The format must match existing property
value. If the property is undefined, it is treated
as defined with the correct type and format with
zero-length data.
XCB_PROP_MODE_APPEND
Insert the new data after the beginning of existing
data. The format must match existing property val‐
ue. If the property is undefined, it is treated as
defined with the correct type and format with zero-
length data.
window The window whose property you want to change.
property The property you want to change (an atom).
type The type of the property you want to change (an atom).
format Specifies whether the data should be viewed as a list of
8-bit, 16-bit or 32-bit quantities. Possible values are 8, 16
and 32. This information allows the X server to correctly
perform byte-swap operations as necessary.
data_len Specifies the number of elements (see format).
data The property data.
DESCRIPTION
Sets or updates a property on the specified window. Properties are for
example the window title (WM_NAME) or its minimum size (WM_NOR‐
MAL_HINTS). Protocols such as EWMH also use properties - for example
EWMH defines the window title, encoded as UTF-8 string, in the
_NET_WM_NAME property.
RETURN VALUE
Returns an xcb_void_cookie_t. Errors (if any) have to be handled in the
event loop.
If you want to handle errors directly with xcb_request_check instead,
use xcb_change_property_checked. See xcb-requests(3) for details.
ERRORS
xcb_alloc_error_t
The X server could not store the property (no memory?).
xcb_window_error_t
The specified window does not exist.
xcb_value_error_t
TODO: reasons?
xcb_match_error_t
TODO: reasons?
xcb_atom_error_t
property or type do not refer to a valid atom.
EXAMPLE
/*
* Sets the WM_NAME property of the window to "XCB Example".
*
*/
void my_example(xcb_connection *conn, xcb_window_t window) {
xcb_change_property(conn,
XCB_PROP_MODE_REPLACE,
window,
XCB_ATOM_WM_NAME,
XCB_ATOM_STRING,
8,
strlen("XCB Example"),
"XCB Example");
xcb_flush(conn);
}
SEE ALSOxcb-requests(3), xcb-examples(3), xcb_intern_atom(3), xprop(1)AUTHOR
Generated from xproto.xml. Contact xcb@lists.freedesktop.org for cor‐
rections and improvements.
XCB 2013-07-27 xcb_change_property(3)
