40 lines
1.1 KiB
C
40 lines
1.1 KiB
C
#include <stdio.h>
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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int main(int argc, char *argv[])
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{
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int client_sockfd;
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int len;
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struct sockaddr_in remote_addr; //服务器端网络地址结构体
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int sin_size;
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char buf[BUFSIZ]; //数据传送的缓冲区
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memset(&remote_addr,0,sizeof(remote_addr)); //数据初始化--清零
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remote_addr.sin_family=AF_INET; //设置为IP通信
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remote_addr.sin_addr.s_addr=inet_addr("127.0.0.1");//服务器IP地址
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remote_addr.sin_port=htons(8000); //服务器端口号
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/*创建客户端套接字--IPv4协议，面向无连接通信，UDP协议*/
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if((client_sockfd=socket(PF_INET,SOCK_DGRAM,0))<0)
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{
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perror("socket error");
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return 1;
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}
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strcpy(buf,"This is a test message"); // 发送的内容
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printf("sending: '%s'\n",buf);
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sin_size=sizeof(struct sockaddr_in);
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/*向服务器发送数据包*/
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if((len=sendto(client_sockfd,buf,strlen(buf),0,(struct sockaddr *)&remote_addr,sizeof(struct sockaddr)))<0)
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{
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perror("recvfrom");
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return 1;
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}
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/*关闭套接字*/
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close(client_sockfd);
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return 0;
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} |