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为何广播失败?
来源: 互联网 发布时间:2015-06-30
本文导语: #include #include #include #include #include #include int main() { int sock=socket(PF_INET,SOCK_DGRAM,0); if(sock==-1) printf("Create socket error !rn"); else { struct sockaddr_in addr; int nBroadcast=1; // enable broadcast ...
#include
#include
#include
#include
#include
#include
int main()
{
int sock=socket(PF_INET,SOCK_DGRAM,0);
if(sock==-1) printf("Create socket error !rn");
else {
struct sockaddr_in addr;
int nBroadcast=1; // enable broadcast
setsockopt(sock,SOL_SOCKET,SO_BROADCAST,&nBroadcast,sizeof(int));
addr.sin_family=PF_INET;
addr.sin_addr.s_addr=0;
addr.sin_port=htons(6068);
if(bind(sock,(struct sockaddr*)&addr,sizeof(struct sockaddr))==-1) printf("Bind on port 68 fail.rn");
else {
char buf[256];
int nLen;
addr.sin_family=PF_INET;
addr.sin_addr.s_addr=htonl(INADDR_BROADCAST);
addr.sin_port=htons(1067);
strcpy(buf,"send some thing through broadcast udp !");
nLen=sendto(sock,buf,strlen(buf),0,(struct sockaddr*)&addr,sizeof(struct sockaddr));
if(nLen
#include
#include
#include
#include
#include
int main()
{
int sock=socket(PF_INET,SOCK_DGRAM,0);
if(sock==-1) printf("Create socket error !rn");
else {
struct sockaddr_in addr;
int nBroadcast=1; // enable broadcast
setsockopt(sock,SOL_SOCKET,SO_BROADCAST,&nBroadcast,sizeof(int));
addr.sin_family=PF_INET;
addr.sin_addr.s_addr=0;
addr.sin_port=htons(6068);
if(bind(sock,(struct sockaddr*)&addr,sizeof(struct sockaddr))==-1) printf("Bind on port 68 fail.rn");
else {
char buf[256];
int nLen;
addr.sin_family=PF_INET;
addr.sin_addr.s_addr=htonl(INADDR_BROADCAST);
addr.sin_port=htons(1067);
strcpy(buf,"send some thing through broadcast udp !");
nLen=sendto(sock,buf,strlen(buf),0,(struct sockaddr*)&addr,sizeof(struct sockaddr));
if(nLen
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