C C 使用Socket通訊UDP

接收端

1 #include 2 #include 3

4#pragma comment(lib,"ws2_32.lib")56
int main(void)7
; //
通訊資料緩衝區
13int nbuflen = 1024,nresult = 0, nsenderaddrsize = sizeof
(ssendaddr);
1415
//初始化socket2.2版本
16 nresult = wsastartup(makeword(2, 2), &wsd);
17if (nresult !=no_error)
1822
23//
建立乙個socket,sock_dgram表示udp型別
24 s =socket(af_inet, sock_dgram, ipproto_udp);
25if (s ==invalid_socket)
2630
31//
填充socket介面
32 srecvaddr.sin_family = af_inet; //
位址協議,af_inet支援tcp和udp
33 srecvaddr.sin_port = htons(uport); //
通訊埠,htons轉為網路位元組順序
34 srecvaddr.sin_addr.s_un.s_addr = htonl(inaddr_any); //
接收任意位址資料
3536
//繫結socket至本機
37 nresult = bind(s, (sockaddr *)&srecvaddr, sizeof
(srecvaddr));
38if (nresult != 0)39
4344 printf("
waiting recv data...\n");
45//
阻塞式接收資料
46 nresult = recvfrom(s, szbuf, nbuflen, 0, (sockaddr *)&ssendaddr, &nsenderaddrsize);
47if (nresult ==socket_error)
4851
else
55//
關閉socket連線
56 nresult =closesocket(s);
57if (nresult ==socket_error)
5862
//清理socket
63wsacleanup();
6465 system("
pause");
66return0;
67 }

#include #include 

#include 
#pragma comment(lib,"ws2_32.lib")
int main(void
) s = socket(af_inet, sock_dgram, 0
); 
if (s ==invalid_socket)
sockaddr_in addr;
socket sockclient = socket(af_inet, sock_dgram, 0
); addr.sin_family =af_inet;
addr.sin_addr.s_un.s_addr = inet_addr("
172.18.0.67");
addr.sin_port = htons(1401
); sendto(sockclient, 
"測試udp通訊！
", 50, 0, (sockaddr *)&addr, 50
); closesocket(s);
wsacleanup();
printf(
"hello world!\n");
system(
"pause");
return0;
}

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