Linux下使用UDP协议传输数据(示例)

#include<bits/stdc++.h> #include <sys/socket.h> #include <netinet/in.h> #include <sys/types.h> #include <arpa/inet.h> #include <unistd.h> //send using namespace std; int main() { int fd=socket(AF_INET,SOCK_DGRAM,0); struct sockaddr_in saddr={0}; saddr.sin_family=AF_INET; // saddr.sin_addr.s_addr=htonl(INADDR_ANY); inet_pton(AF_INET,"127.1.1.1",&saddr.sin_addr); //The ip could be your remote server; You'd better not put the recver in 127.1.1.1 saddr.sin_port=htons(8001); int ret; for(int i=0;i<1000;i++) { ret=sendto(fd,"hello world.",sizeof("hello world."),0,(sockaddr*)&saddr,sizeof(struct sockaddr)); if(ret<0) { cout<<"send failed"<<endl; close(fd); return 0; } } //Send "end" for once cannot make sure that "end" must recved by recver.So you'd better send it many times or establish the err checking. //However,to be esaier and clearly,I send it for only once. sendto(fd,"end",sizeof("end"),0,(sockaddr*)&saddr,sizeof(struct sockaddr)); if(ret<0) { cout<<"send failed"<<endl; close(fd); return 0; } cout<<"send end."<<endl; close(fd); }