一个最基本的socket客户端编程

采用INET 通信方式

#include <sys/types.h>
#include <sys/socket.h>
#include <stdio.h>
#include <netinet/in.h>

int main()

{

int sockfd; //套接字句柄
int len;
struct sockaddr_in address; //要连的的目地地址
int result;

sockfd = socket(AF_INET, SOCK_STREAM, 0); //创建套接字

address.sin_family = AF_INET; //初始化目地套接字的类型
address.sin_addr.s_addr = inet_addr("172.16.64.69"); //初始化目地套接字的地址
address.sin_port = htons(20001); //初始化目地套接字的端口号
len = sizeof(address);

result = connect(sockfd, (struct sockaddr *)&address, len); //连接到目地地址

if(result == -1)

{
printf("connect error/n");
return 1;
}

char buf[20];

sprintf(buf,"hello world!");

write(sockfd, buf, 20*sizeof(char)); //发送数据

}