// 发送端
02.#include
03.#include
04.#include<sys/socket.h>05.#include
06.#include<sys/types.h>07.#include
08.#include<netinet/in.h>09.#include<arpa/inet.h>10.#include
11.
12.
13.using namespace std;
14.
15.int main()
16.{
17. setvbuf(stdout, NULL, _IONBF, 0);
18. fflush(stdout);
19.
20. int sock = -1;
21. if ((sock = socket(AF_INET, SOCK_DGRAM, 0)) == -1)
22. {
23. cout<<"socket error"<<endl;
24. return false;
25. }
26.
27. const int opt = 1;
28. //设置该套接字为广播类型，
29. int nb = 0;
30. nb = setsockopt(sock, SOL_SOCKET, SO_BROADCAST, (char *)&opt, sizeof(opt));
31. if(nb == -1)
32. {
33. cout<<"set socket error..."<<endl;
34. return false;
35. }
36.
37. struct sockaddr_in addrto;
38. bzero(&addrto, sizeof(struct sockaddr_in));
39. addrto.sin_family=AF_INET;
40. addrto.sin_addr.s_addr=htonl(INADDR_BROADCAST);
41. addrto.sin_port=htons(6000);
42. int nlen=sizeof(addrto);
43.
44. while(1)
45. {
46. sleep(1);
47. //从广播地址发送消息
48. char smsg[] = {"abcdef"};
49. int ret=sendto(sock, smsg, strlen(smsg), 0, (sockaddr*)&addrto, nlen);
50. if(ret<0)
51. {
52. cout<<"send error...."<<ret<<endl;
53. }
54. else
55. {
56. printf("ok ");
57. }
58. }
59.
60. return 0;
61.}
[cpp] view plaincopy
01.// 接收端 http://blog.csdn.net/robertkun
02.
03.#include
04.#include
05.#include<sys/socket.h>06.#include
07.#include<sys/types.h>08.#include
09.#include<netinet/in.h>10.#include<arpa/inet.h>11.#include
12.
13.
14.using namespace std;
15.
16.int main()
17.{
18. setvbuf(stdout, NULL, _IONBF, 0);
19. fflush(stdout);
20.
21. // 绑定地址
22. struct sockaddr_in addrto;
23. bzero(&addrto, sizeof(struct sockaddr_in));
24. addrto.sin_family = AF_INET;
25. addrto.sin_addr.s_addr = htonl(INADDR_ANY);
26. addrto.sin_port = htons(6000);
27.
28. // 广播地址
29. struct sockaddr_in from;
30. bzero(&from, sizeof(struct sockaddr_in));
31. from.sin_family = AF_INET;
32. from.sin_addr.s_addr = htonl(INADDR_ANY);
33. from.sin_port = htons(6000);
34.
35. int sock = -1;
36. if ((sock = socket(AF_INET, SOCK_DGRAM, 0)) == -1)
37. {
38. cout<<"socket error"<<endl;
39. return false;
40. }
41.
42. const int opt = 1;
43. //设置该套接字为广播类型，
44. int nb = 0;
45. nb = setsockopt(sock, SOL_SOCKET, SO_BROADCAST, (char *)&opt, sizeof(opt));
46. if(nb == -1)
47. {
48. cout<<"set socket error..."<<endl;
49. return false;
50. }
51.
52. if(bind(sock,(struct sockaddr *)&(addrto), sizeof(struct sockaddr_in)) == -1)
53. {
54. cout<<"bind error..."<<endl;
55. return false;
56. }
57.
58. int len = sizeof(sockaddr_in);
59. char smsg[100] = {0};
60.
61. while(1)
62. {
63. //从广播地址接受消息
64. int ret=recvfrom(sock, smsg, 100, 0, (struct sockaddr*)&from,(socklen_t*)&len);
65. if(ret<=0)
66. {
67. cout<<"read error...."<<sock<<endl;
68. }
69. else
70. {
71. printf("%s\t", smsg);
72. }
73.
74. sleep(1);
75. }
76.
77. return 0;
78.} 自已在Linux虚拟机下测试可以成功, 前提是要把主机设置在同一网段内, 还有就是不要忘记关闭Linux的防火墙.. 可以使用setup命令进行设置。 (我在测试的时候只能发送不收接收，折磨了我半天，后来才想到是Linux防火墙的问题。。) 关于虚拟机的网卡配置，建议选择桥接模式。NAT的模式的话，是受限制的，可能会收不到广播消息。 具体的参考网上的文章吧。。 祝你成功。。Linux系统下UDP发送和接收广播,布布扣,bubuko.com
原文地址：http://my.oschina.net/yuyang/blog/289591
