flush

I'm working on an iPhone App and wanted to use: CFStreamCreatePairWithSocketToHost(NULL, url, port, &serverReadStream, &serverWriteStream); And after that use the: [serverWriteStream write:[sendData bytes] maxLength:[sendData length]]; I want to send small Packages of 5 Bytes to get realtime updates. My problem is now, that the stream only sends data when the buffer is full. So I need some kind of a flush method or tell the stream to immediately send the data. Searching for this problem ended in finding 'TCP_NODELAY' which seems to belong to the undocumented API ( which I mustn't use for

I understand the theory behind BufferedOutputStream . Bytes are written to a buffer array until it is full, and then written (flushed) to the underlying stream - the idea being that it is faster than writing byte-by-byte as there are fewer OS calls. However, from looking at the implementation of the BufferedOutputStream class and methods ( BufferedOutputStream.java ), it seems that ultimately, the bytes from the buffer are just written byte-by-byte. I think this is the case because: In BufferedOutputStream.write(byte b[], int off, int len) it has the line out.write(b, off, len). Since out is

By default it will not print out anything until the whole page has finished executing. Is there any function that can make it flush out right away? But not by calling ob_end_flush() multiple times, which is not what I want. Hope you guys got me? If output buffering is on, then flushing it is the only way to output anything to the browser. If you want to output right away then turn of output buffering. If that is not in your control you can just call ob_end_flush() at the srart of your script which will turn the output buffering off. There is no way however to let some messages pass, and some

Just a quick question, but is the flush necessary in this code? Note this would be inside of a JPA transaction. User user = new User(); em.persist(user); em.flush; User aUser = em.find(User.class,user.getId()); assert(user.equals(aUser)); Or is will it work without the flush? User user = new User(); em.persist(user); User aUser = em.find(User.class,user.getId()); assert(user.equals(aUser)); Or same question but a little more involved example: User user = em.find(User.class,id); user.setName("My Name"); em.merge(user); em.flush; //Is this line needed? User aUser = em.createQuery("select u from

By definition taken from: http://www.cplusplus.com/reference/iostream/ostream/flush/ , it is not clear why the function exists, and for what purpose you would use it for. Why not call flush(), every time your write to the stream? Mysticial In all likelihood, the word flush comes from exactly what you'd flush in real-life. A toilet... So let's try a toilet analogy: Flushing every time a new one drops into the bowl is very time-consuming and a complete waste of water. That's a big problem today where everyone's trying to be environmentally friendly. So what do you do instead? You buffer it by