Linux下C語言實現簡單的udp通訊

用c語言實現udp 通訊。寫乙個udp 的客戶端，可以向外傳送訊息。再寫乙個udp服務端，接收客戶端的訊息，並且列印出來。

*事先說明：

在window和linux中有一下結構：

struct sockaddr

struct sockaddr_in //在netinet/in.h 中定義:儲存ip位址，使用in_addr這個資料結構

typedef uint32_t, in_addr_t;

struct in_addr

* 伺服器**如下：

#include 

#include 
#include // for close()
#include 
#include 
#include 
#include 
#include 
#define port 12347  
#define maxdatasize 1024  
int main()
bzero(&server, sizeof(server));//將位元組型別的字串的前n個位元組為零，包括'\0'
server.sin_family = af_inet;
server.sin_port = htons(port);
server.sin_addr.s_addr = htonl(inaddr_any);
if(bind(sockefd, (struct sockaddr *)&server, sizeof(struct sockaddr)) == -1)
sin_size = sizeof(struct sockaddr_in);
while(1)
recemsg[num] = '\0';
printf("you got a message (%s) from %s\n", recemsg, inet_ntoa(client.sin_addr));
if(strcmp(recemsg, condition) == 0)
for(i=0; i1-i];
}sendmsg[i] = '\0';
sendto(sockefd, sendmsg, strlen(sendmsg), 0 ,(struct sockaddr *)&client,sin_size);
}close(sockefd);
return
0;}

#include 

#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
#define server_ip "127.10.10.11"
#define port 12347
#define maxdatasize 1024
int main()
bzero(&server, sizeof(server));
server.sin_family = af_inet;
server.sin_port = htons(port);
server.sin_addr.s_addr = inet_addr(server_ip);
socklen_t len;
len = sizeof(struct sockaddr_in);
while(1)
recvbuff[numbytes] = '\0';
printf("server return message is %s\n", recvbuff);
}close(fd);
return
0;}

#include 

#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
#define server_ip "127.10.10.11"
#define port 12347
#define maxdatasize 1024
int main(int argc, char
const *argv)
bzero(&server, sizeof(server));
server.sin_family = af_inet;
server.sin_port = htons(port);
server.sin_addr = *((struct in_addr *)he->h_addr);
socklen_t len;
len = sizeof(struct sockaddr_in);
while(1)
recvbuff[numbytes] = '\0';
printf("server return message is %s\n", recvbuff);
}close(fd);
return
0;}

執行：./client 127.0.0.1

此時的結果和上面的客戶端**的結果一樣。

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