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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" /><title>Introduction</title><link rel="stylesheet" href="udtdoc.css" type="text/css" /></head><body><div class="ref_head"> UDT Tutorial</div><h3><font color="#000080">Hello World!</font></h3><p>In this section we will introduce the simplest UDT program that can transfer data in high performance.</p><p>This simple "Hello World!" example includes a server program and a client program just like any socket programming tutorial. These are the simpler version of the appserver and appclient examples in ./app directory.</p><p>To compile, use <em>gcc -o server server.cpp -I <udt.h location> -L <libudt.so location>-ludt -lstdc++ -lpthread</em>. For more details, please refer to the Makefile in <em>./app</em> directory.</p><p><b>UDT server example</b></p><div class="code">#include <arpa/inet.h><br><br>using namespace std;<br><br>using namespace UDT;<br><br>int main()<br>{<br>UDTSOCKET serv = UDT::socket(AF_INET, SOCK_STREAM, 0);<br><br>sockaddr_in my_addr;<br>my_addr.sin_family = AF_INET;<br>my_addr.sin_port = htons(9000);<br>my_addr.sin_addr.s_addr = INADDR_ANY;<br>memset(&(my_addr.sin_zero), '\0', 8);<br><br>if (UDT::ERROR == UDT::bind(serv, (sockaddr*)&my_addr, sizeof(my_addr)))<br>{<br> cout << "bind: " << UDT::getlasterror().getErrorMessage();<br> return 0;<br>}<br><br>UDT::listen(serv, 10);<br><br>int namelen;<br>sockaddr_in their_addr;<br><br>UDTSOCKET recver = UDT::accept(serv, (sockaddr*)&their_addr, &namelen);<br><br>char ip[16];<br>cout << "new connection: " << inet_ntoa(their_addr.sin_addr) << ":" << ntohs(their_addr.sin_port) << endl;<br><br>char data[100];<br><br>if (UDT::ERROR == UDT::recv(recver, data, 100, 0))<br>{<br> cout << "recv:" << UDT::getlasterror().getErrorMessage() << endl;<br> return 0;<br>}<br><br>cout << data << endl;<br><br>CUDT::close(recver);<br>CUDT::close(serv);<br><br>return 1;<br>}</div><p>This simple server tries to bind itself at port 9000. If succeed, it listens at port 9000 and accepts a client and then reads a string.</p><p><strong>UDT client example </strong></p><div class="code">#include <iostream><br>#include <udt.h><br>#include <arpa/inet.h><br><br>using namespace std;<br>using namespace UDT;<br><br>int main()<br>{<br>UDTSOCKET client = UDT::socket(AF_INET, SOCK_STREAM, 0);<br><br>sockaddr_in serv_addr;<br>serv_addr.sin_family = AF_INET;<br>serv_addr.sin_port = htons(9000);<br>inet_pton(AF_INET, "127.0.0.1", &serv_addr.sin_addr);<br><br>memset(&(serv_addr.sin_zero), '\0', 8);<br><br>// connect to the server, implict bind<br>if (UDT::ERROR == UDT::connect(client, (sockaddr*)&serv_addr, sizeof(serv_addr)))<br>{<br> cout << "connect: " << UDT::getlasterror().getErrorMessage();<br> return 0;<br>}<br><br>char* hello = "hello world!\n";<br>if (UDT::ERROR == UDT::send(client, hello, strlen(hello) + 1, 0))<br>{<br> cout << "send: " << UDT::getlasterror().getErrorMessage();<br> return 0;<br>}<br><br>UDT::close(client);<br><br>return 1;<br>}</div><p>The client side connects to the local address (127.0.0.1) at port 9000, and sends a "hello world!" message.</p><p>Note that in this "Hello World!" example the UDT::send and UDT::recv routines should use a loop to check return value. However, since the string length is very small and can be hold in one packet, we omit the loop part in order to give a simpler example.</p><p> </p></body></html>⌨️ 快捷键说明
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