08-27-2008
this is not help me....do you have some examples???
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LEARN ABOUT CENTOS
xcb-examples
xcb-examples(3) XCB examples xcb-examples(3)
NAME
xcb-examples - manpage examples
DESCRIPTION
Many of the XCB manpages contain example code. These examples intend to explain how to use one particular part of XCB. They almost never
represent a standalone (or even useful) program - X11 programs are relatively involved and thus beyond the scope of a manpage example.
ENVIRONMENT
Every example assumes you have an xcb_connection and possibly other variables at hand. For illustrating how xcb_get_property works, you
need the window of which you want to get the property, for example. To make it clear that these variables are your responsibility, these
examples consist of a single function which takes the necessary variables as parameters.
FLUSHING
Flushing means calling xcb_flush to clear the XCB-internal write buffer and send all pending requests to the X11 server. You don't explic-
itly need to flush before using a reply function (like xcb_query_pointer_reply), but you do need to flush before entering the event loop of
your program.
There are only two cases when XCB flushes by itself. The first case is when its write buffer becomes full, the second case is when you are
asking for the reply of a request which wasn't flushed out yet (like xcb_query_pointer_reply). This last point also includes
xcb_request_check(). Please note that waiting for an event does NOT flush.
Examples generally include the xcb_flush call where appropriate (for example after setting a property). Therefore, including these func-
tions and calling them in your application should just work. However, you might get better results when flushing outside of the function,
depending on the architecture of your program.
COMPILATION
If an example does not compile (without warnings) when using -std=c99, that is considered a documentation bug. Similarly, not handling
errors or leaking memory is also considered a documentation bug. Please inform us about it on xcb@lists.freedesktop.org.
CODING STYLE
Every example uses 4 spaces for indention.
Comments are in asterisks, like /* this */.
No line is longer than 80 characters (including indention).
SEE ALSO
xcb_connect(3), xcb_get_property(3), xcb_flush(3)
AUTHOR
Michael Stapelberg <michael+xcb at stapelberg dot de>
XCB
2011-12-11 xcb-examples(3)