Receiving packets in UDP
c#, c++, networking, udp
Solution
You will get it all or nothing.
But there is no particular guarantee that you will receive packets exactly once in the order they were transmitted; packet loss, reordering and (less often) duplication are all possible.
There is a maximum frame size (of 65,507 bytes), send()ing packets of larger sizes will return an error.
You must provide enough buffer to receive the entire frame in one call.
UDP packets CAN be fragmented into multiple IP fragments, but the OS will drop an incomplete packet. This is therefore transparent to the application.
Problem
Let's say my program sends a 1000 bytes over the network (UDP). Does it guaranteed that the receiver will receive the 1000 bytes in one "batch"? Or perhaps he will need to perform sevral "reads" until he'll receive the entire message? if the later is true, how can i ensure that the order of the packets for the same message don't get "mixed up" (in order), or perhaps the protocol guarantees it? Edit: that is, does it possible that my message will be split to sevral packets? (what if i try to send a 10000mb message, what happens then?)