调试环境：MAGIC C++ 3.0 CYGWIN 资料来源：http://www.chinalinuxpub.com/read.php?wid=180 Linux环境下的Socket编程 BAIDU了一些资料，这个基本编译OK，注释详细，函数和结构定义基本能从MSDN上找到说明。
#include<stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <string.h>
#include <netdb.h>
#include <sys/types.h>
#include <netinet/in.h>
#include <sys/socket.h>
#define SERVPORT 3333
#define MAXDATASIZE 100 /*每次最大数据传输量 */
main(int argc, char *argv[])&leftsign;
int sockfd, recvbytes;
char buf[MAXDATASIZE];
struct hostent *host;
struct sockaddr_in serv_addr;
if (argc < 2) &leftsign;
fprintf(stderr,"Please enter the server\’s hostname!\\n");
exit(1);
&rightsign;
if((host=gethostbyname(argv[1]))==NULL) &leftsign;
herror("gethostbyname出错！");
exit(1);
&rightsign;
printf("%s\\n",inet_ntoa(host->h_addr));
if ((sockfd = socket(AF_INET, SOCK_STREAM, 0)) == -1)&leftsign;
perror("socket创建出错！");
exit(1);
&rightsign;
serv_addr.sin_family=AF_INET;
serv_addr.sin_port=htons(SERVPORT);
serv_addr.sin_addr = *((struct in_addr *)host->h_addr);
bzero(&(serv_addr.sin_zero),8);
if (connect(sockfd, (struct sockaddr *)&serv_addr, sizeof(struct sockaddr)) == -1) &leftsign;
perror("connect出错！");
exit(1);
&rightsign;
sleep(10);
if ((recvbytes=recv(sockfd, buf, MAXDATASIZE, 0)) ==-1) &leftsign;
perror("recv出错！");
exit(1);
&rightsign;
buf[recvbytes] = \’\\0\’;
printf("Received: %s",buf);
close(sockfd);
&rightsign;
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