More easily receive UDP Data via boost::asio providing just IP address and port umber.<\/p>\n
The boost::asio classes provide a cross platform way to communicate via UDP without having to use the raw socket libraries, however they can be confusing and hard to use do to their designed-in flexibility.<\/p>\n
Sometimes I just want to provide an IP address and a port number and just receive messages so I have written a wrapper class called boost_udp_receive_rar which can be found on GitHub here<\/a>.<\/p>\n It has 4 functions that allow you to receive string or binary messages in a synchronous or asynchronous manner, for example to receive ASCII string data:<\/p>\n#include \"boost_udp_send_faf.h\"\r\n#include <thread>\r\n\r\n\/\/ Setup a receiver, specifying IP address and port\r\n\/\/ Note the IP address is that of the receiving network\r\n\/\/ interface. As always with UDP and non-standard ports\r\n\/\/ check that a firewall isn't blocking data transfer.\r\nboost_udp_receive_rar rar(\"127.0.0.1\", 8861);\r\n\r\n\/\/ Receive a datagram synchronously as a string\r\n\/\/\r\nstd::string datagram = rar.receive_sync();\r\n\r\nstd::count << \"received: \" << datagram << std::endl;\r\n\r\n\/\/ Asynchronously receive a datagram as a string\r\n\/\/\r\n\/\/ We loop calling receive_async() until it returns\r\n\/\/ a non-empty string. receive_async() returns quickly\r\n\/\/ and we can do other work (or other async reads on different\r\n\/\/ ports) while we wait for somethign to arrive.\r\n\r\n\r\ndo {\r\n datagram = rar.receive_async();\r\n\r\n \/\/ Do other stuff\r\n \/\/\r\n \/\/ Better do a little sleep to be nice to the\r\n \/\/ CPU\r\n std::this_thread::sleep_for(std::chrono::milliseconds(100));\r\n\r\n} while (datagram.empty());\r\n\r\nstd::count << \"received: \" << datagram << std::endl;\r\n<\/pre>\n