Linux系統下UDP發送和接收廣播訊息小例子

來源:互聯網
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// 發送端#include <iostream>#include <stdio.h>#include <sys/socket.h>#include <unistd.h>#include <sys/types.h>#include <netdb.h>#include <netinet/in.h>#include <arpa/inet.h>#include <string.h>using namespace std;int main(){setvbuf(stdout, NULL, _IONBF, 0); fflush(stdout); int sock = -1;if ((sock = socket(AF_INET, SOCK_DGRAM, 0)) == -1) {   cout<<"socket error"<<endl;return false;}   const int opt = 1;//設定該通訊端為廣播類型,int nb = 0;nb = setsockopt(sock, SOL_SOCKET, SO_BROADCAST, (char *)&opt, sizeof(opt));if(nb == -1){cout<<"set socket error..."<<endl;return false;}struct sockaddr_in addrto;bzero(&addrto, sizeof(struct sockaddr_in));addrto.sin_family=AF_INET;addrto.sin_addr.s_addr=htonl(INADDR_BROADCAST);addrto.sin_port=htons(6000);int nlen=sizeof(addrto);while(1){sleep(1);//從廣播位址發送訊息char smsg[] = {"abcdef"};int ret=sendto(sock, smsg, strlen(smsg), 0, (sockaddr*)&addrto, nlen);if(ret<0){cout<<"send error...."<<ret<<endl;}else{printf("ok ");}}return 0;}

 

// 接收端 http://blog.csdn.net/robertkun#include <iostream>#include <stdio.h>#include <sys/socket.h>#include <unistd.h>#include <sys/types.h>#include <netdb.h>#include <netinet/in.h>#include <arpa/inet.h>#include <string.h>using namespace std;int main(){setvbuf(stdout, NULL, _IONBF, 0); fflush(stdout); // 綁定地址struct sockaddr_in addrto;bzero(&addrto, sizeof(struct sockaddr_in));addrto.sin_family = AF_INET;addrto.sin_addr.s_addr = htonl(INADDR_ANY);addrto.sin_port = htons(6000);// 廣播位址struct sockaddr_in from;bzero(&from, sizeof(struct sockaddr_in));from.sin_family = AF_INET;from.sin_addr.s_addr = htonl(INADDR_ANY);from.sin_port = htons(6000);int sock = -1;if ((sock = socket(AF_INET, SOCK_DGRAM, 0)) == -1) {   cout<<"socket error"<<endl;return false;}   const int opt = 1;//設定該通訊端為廣播類型,int nb = 0;nb = setsockopt(sock, SOL_SOCKET, SO_BROADCAST, (char *)&opt, sizeof(opt));if(nb == -1){cout<<"set socket error..."<<endl;return false;}if(bind(sock,(struct sockaddr *)&(addrto), sizeof(struct sockaddr_in)) == -1) {   cout<<"bind error..."<<endl;return false;}int len = sizeof(sockaddr_in);char smsg[100] = {0};while(1){//從廣播位址接受訊息int ret=recvfrom(sock, smsg, 100, 0, (struct sockaddr*)&from,(socklen_t*)&len);if(ret<=0){cout<<"read error...."<<sock<<endl;}else{printf("%s\t", smsg);}sleep(1);}return 0;}

自已在Linux虛擬機器下測試可以成功, 前提是要把主機設定在同一網段內, 還有就是不要忘記關閉Linux的防火牆.. 可以使用setup命令進行設定。

(我在測試的時候只能發送不收接收,折磨了我半天,後來才想到是Linux防火牆的問題。。)

 

關於虛擬機器的網卡配置,建議選擇橋接模式。NAT的模式的話,是受限制的,可能會收不到廣播訊息。

具體的參考網上的文章吧。。

祝你成功。。

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