On Sat, Apr 14, 2012 at 4:15 AM, Dawen Rie <dawenh...@126.com> wrote: > Hello everybody. I am a new user of libevent. I can't find the correct API > to do my work. > I had found the API: > > int bufferevent_write_buffer(struct bufferevent *bufev, struct evbuffer > *buf); > It will send all data of evbuffer. But I just want to send a special > length not all. > > And API: > int bufferevent_write(struct bufferevent *bufev, const void *data, size_t > size); > > > It require me copy out the data from evbuffer, I think it's inefficiency. > > So, is there andy API like: > int bufferevent_write_buffer(struct bufferevent *bufev, struct evbuffer > *buf, size_t size); > > It just send size of data in but?
Hi! What you want to be looking at first is bufferevent_get_output(). It returns an output evbuffer that you can add data to manually. The bufferevent_write() and bufferevent_write_buffer() functions are thin wrappers around bufferevent_get_output() and one of the evbuffer_* functions. So now the question becomes, "how can I add move (but not all) of the data from one evbuffer to another?" For that, see evbuffer_remove_buffer(). For more information, you might want to read the (perpetually work-in-progress) reference manual at http://www.wangafu.net/~nickm/libevent-book/ yrs, -- Nick *********************************************************************** To unsubscribe, send an e-mail to majord...@freehaven.net with unsubscribe libevent-users in the body.
