网络编程单纯UDP通信

网络编程 单纯UDP通信

1，UDP发送端

2，UDP接收端

UDP发送端：

#include #include #include #include #include #include int main(int argc, char* argv[]){  int sock;  sockaddr_in addr;  int n;  if(argc != 2){    return 1;  }  sock = socket(AF_INET, SOCK_DGRAM, 0);  addr.sin_family = AF_INET;  addr.sin_port = htons(12345);  inet_pton(AF_INET, argv[1], &addr.sin_addr.s_addr);  n = sendto(sock, "aaaaa", 5, 0, (sockaddr*)&addr, sizeof(addr));  close(sock);  return 0;}

github源代码

发送端的执行方式：

./a.out 127.0.0.1

UDP接收端

#include #include #include #include #include int main(){  int sock;  sockaddr_in addr;  sockaddr_in senderinfo;  socklen_t addrlen;  char buf[2048];  int n;  sock = socket(AF_INET, SOCK_DGRAM, 0);  addr.sin_family = AF_INET;  addr.sin_port = htons(12345);  addr.sin_addr.s_addr = INADDR_ANY;  bind(sock, (sockaddr*)&addr, sizeof(addr));  addrlen = sizeof(senderinfo);  n = recvfrom(sock, buf, sizeof(buf) - 1, 0,       (sockaddr*)&senderinfo, &addrlen);  write(fileno(stdout), buf, n);  close(sock);  return 0;}

github源代码

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