Hi, I'm pretty new at programming and esp network programming so if it's stupid, don't bash too hard please, thanks. I have client and server communicating with diagrams (UDP) in C. client sends 5 msgs and upon receiving msgs, server sends msgs back. receiving and sending messages are great until client has finished receiving the msgs. ...
I wish to have two classes, a server class and a client class. The server class should recieve the IP address and Port number of each new client and store them in a list. It should supply each of the clients with a list of connected clients and their IP addresses. The clients could then communicate with each other using TCP connection...
In C++, when I run (red alert! pseudo-code) bind(s1, <local address:port1234>) bind(s2, <local address:port1234>) on two different UDP sockets (s1 and s2 each created with a call to socket()) I get problems. In Linux (Ubuntu), the double binding seems to be fine. In Windows, however, the double binding fails, and the call to bind() th...
I'm implementing a remote application. The server will process & render data in real time as animation. (a series of images, to be precise) Each time, an image is rendered, it will be transferred to the receiving iPhone client via UDP. I have studied some UDP and I am aware of the following: UDP has max size of about 65k. However, it...
I need to send floating point numbers using a UDP connection to a Qt application. Now in Qt the only function available is qint64 readDatagram ( char * data, qint64 maxSize, QHostAddress * address = 0, quint16 * port = 0 ) which accepts data in the form of signed character buffer. I can convert my float into a string and send it but i...
My program use UdpClient to try to receive 27 responses from 27 hosts. The size of the response is 10KB. My broadband incoming bandwidth is 150KB/s. The 27 responses are sent from the hosts almost at the same time and for every 10 secs. However, I can only receive 8 - 17 responses each time. The number of responses that I can receive ...
I'm building UDP server application in C#. I've come across a packet checksum problem. As you probably know, each packet should carry some simple way of telling receiver if packet data is intact. Now, UDP already has 2-byte checksum as part of header, which is optional, at least in IPv4 world. Alternative method is to have custom check...
Hi all As we know for UDP receive, we use Socket.ReceiveFrom or UdpClient.receive Socket.ReceiveFrom accept a byte array from you to put the udp data in. UdpClient.receive returns directly a byte array where the data is My question is that How to set the buffer size inside Socket. I think the OS maintains its own buffer for receive U...
As we know for UDP receive, we use Socket.ReceiveFrom or UdpClient.receive Socket.ReceiveFrom accept a byte array from you to put the udp data in. UdpClient.receive returns directly a byte array where the data is My question is that How to set the buffer size inside Socket. I think the OS maintains its own buffer for receive UDP data,...
Hi I would like to create a chat application(desktop-app) in c++, so which protocol i would need to study and implement. UDP(?) Please provide me some good thoughts and advices and links also. ...
Hi, I am writing clients in Java that store the data on a database server. So far, the IP and Port of the server has to be specified in the client's settings manually. I have heard, that it is possible to automatically determine the IP of database servers via broadcast / multicast / UDP (I am not familiar with these concepts). Question: ...
Greetings, I have a simple client/server setup. The server is in C and the client that is querying the server is Java. My problem is that, when I send bandwidth-intensive data over the connection, such as Video frames, it drops up to half the packets. I make sure that I properly fragment the udp packets on the server side (udp has a ma...
I'm just starting to learn how network programming in C works, and I've written a small program that sends messages to and from a UNIX terminal. I'm using pthreads in my program, one of which essentially just waits on recvfrom() to receive a message. However, I want to be able to close all threads properly if the users chooses to quit t...
can I make a UDP berkley socket hold only a UDP single message ? meaning it will override existing message if unread message is present when a new message arrives ? ...
Hi I am trying to create a reliable service on top of UDP. Here i need to timeout receiveFrom function of window c++ if not packet arrives in specified time. In java i do this DatagramSocket.setSoTimeout but i dont know how to achieve this in windows c++. thanks ...
Hello I want write my own desktop sharing application in Java. The application should have some very default features: Capture screen; Allow a remote connected user to click / edit fields. I was thinking to use Java Robot class for mouse movements / key pressing. The problem is i don't know what screen capture strategy to use. Sho...
I am having some trouble dissecting a UDP packet. I am receiving the packets and storing the data and sender-address in variables 'data' and 'addr' with: data,addr = UDPSock.recvfrom(buf) This parses the data as a string, that I am now unable to turn into bytes. I know the structure of the datagram packet which is a total of 28 bytes,...
I am working on a UDP server built with boost::asio and I started from the tutorial customizing to my needs. When I call socket.receive_from(boost::asio::buffer(buf), remote, 0, error); it fills my buffer with data from the packet, but, if my understanding is correct, it drops any data that won't fit in the buffer. Subsequent calls to re...
We sending data over UDP from the iPhone, sometimes, but not always, in response to our first send() of UDP data, we are getting back a -1 return code and errno set to 1 (EPERM / operation not permitted). The EPERM result for send(), sendto() and sendmsg() is not documented in the man pages as a return result from those functions. Has a...
I've implemented a simple UDP ping/pong protocol to discover other computers connected to the same WiFI router. This works fine on many WiFI and Ethernet routers, but when I go out on the street to give it a try, many public WiFI networks seem to have either UDP Broadcasts/Multicast disabled, or UDP disabled completely. What other optio...