Use SOCKET in Android ndk

The entire process of using socket in Android ndk is divided into the following parts:
Part 1: Create a socket and bind the IP address and port

# Include <sys/select. h> # include <sys/socket. h> # include <ARPA/inet. h> # define max_data_buf_len 10240 int SD = invalid_socket; sockaddr_in addr_org; // sending end address SD = socket (af_inet, sock_dgram, ipproto_udp); // create socket timeout = af_inet; vertex = inet_addr ("192.128.0.1"); // sending end IP addr_org.sin_port = htons (8080); // sending end port BIND (SD, (struct sockaddr *) & (addr_org ), sizeof (struct sockaddr_in); // bind the IP address and port

Part 2: send data

Sockaddr_in addr_dst; // acceptor address addr_dst.sin_family = af_inet; receiver = inet_addr ("192.128.0.2"); // acceptor IP address receiver = htons (8080); // acceptor port... // generate the data to be sent to senddatabuff. The length is ullen sendto (SD, senddatabuff, ullen, 0, (struct sockaddr *) & (addr_dst), sizeof (sockaddr_in )); // send data in senddatabuff

Part 3: receiving data in a thread (non-blocking)

Void * socketreceivethread (void * pparam) {fd_set fdset; struct timeval delayval; unsigned long lretval; delayval. TV _sec = 0; delayval. TV _usec = 5000;/* 5 ms latency */while (! End_flag) {fd_zero (& fdset); fd_set (SD, & fdset); lretval = select (SD + 1, & fdset, null, null, & delayval ); // pay special attention to the first parameter if (0 = lretval) {continue;} else if (socket_error = lretval) {break;} else if (fd_isset (SD, & fdset )! = 0) {char recvdatabuff [max_data_buf_len]; // receives data buffer unsigned long ullen = recvfrom (SD, recvdatabuff, max_data_buf_len, 0, null, null );... // process received data }}}

Part 4: Disable socket

close(sd);