请教C#网络编程问题！

客户端代码：

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#include
#include
#include
#pragma comment(lib,"Ws2_32.lib")
#define BUFFER_SIZE 50
/*客户端代码
*/
int main()
{
int err;
SOCKET sClient;
char ip[20]; /*IP地址*/
char buf[BUFFER_SIZE]; /*数据发送缓冲区*/
int port; /*端口*/
WSADATA wsaD;
struct sockaddr_in servaddr; /*存放服务器端网络地址的结构*/
printf("Please input target IP and Port(eg:127.0.0.1 5555):\n");
scanf("%s%hu",ip,&port);
memset(&servaddr,0,sizeof(servaddr));
servaddr.sin_family = AF_INET;
servaddr.sin_addr.s_addr = inet_addr(ip);
servaddr.sin_port = htons(port);
/*Winsock初始化*/
err = WSAStartup(MAKEWORD(1,1),&wsaD);
/*创建Socket*/
if((sClient = socket(AF_INET,SOCK_STREAM,IPPROTO_TCP)) == SOCKET_ERROR){
err = WSAGetLastError();
printf("Create socket error %d",err);
return -1;
}
/*连接到服务器*/
if(connect(sClient,(struct sockaddr *) &servaddr,sizeof(servaddr)) == SOCKET_ERROR){
err = WSAGetLastError();
printf("Failed to connect to server!%d\n",err);
return -1;
}
printf("Connected to server %s\n",inet_ntoa(servaddr.sin_addr));
while(1)
{
gets(buf);
if (strcmp(buf,"quit")==0 || strcmp(buf,"exit")==0)
break;
send(sClient,buf,strlen(buf)+1,0) ;/*发送数据*/
}
closesocket(sClient);
WSACleanup();

}
#include
#include
#include
#pragma comment(lib,"Ws2_32.lib")
#define BUFFER_SIZE 50
/*客户端代码

*/
int main()
{
int err;
SOCKET sClient;
char ip[20]; /*IP地址*/
char buf[BUFFER_SIZE]; /*数据发送缓冲区*/
int port; /*端口*/
WSADATA wsaD;
struct sockaddr_in servaddr; /*存放服务器端网络地址的结构*/
printf("Please input target IP and Port(eg:127.0.0.1 5555):\n");
scanf("%s%hu",ip,&port);
memset(&servaddr,0,sizeof(servaddr));
servaddr.sin_family = AF_INET;
servaddr.sin_addr.s_addr = inet_addr(ip);
servaddr.sin_port = htons(port);
/*Winsock初始化*/
err = WSAStartup(MAKEWORD(1,1),&wsaD);
/*创建Socket*/
if((sClient = socket(AF_INET,SOCK_STREAM,IPPROTO_TCP)) == SOCKET_ERROR){
err = WSAGetLastError();
printf("Create socket error %d",err);
return -1;
}
/*连接到服务器*/
if(connect(sClient,(struct sockaddr *) &servaddr,sizeof(servaddr)) == SOCKET_ERROR){
err = WSAGetLastError();
printf("Failed to connect to server!%d\n",err);
return -1;
}
printf("Connected to server %s\n",inet_ntoa(servaddr.sin_addr));
while(1)
{
gets(buf);
if (strcmp(buf,"quit")==0 || strcmp(buf,"exit")==0)
break;
send(sClient,buf,strlen(buf)+1,0) ;/*发送数据*/
}
closesocket(sClient);
WSACleanup();

}

服务端代码：

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#include
#include
#pragma comment(lib,"Ws2_32.lib")
//#pragma comment(linker, "/SUBSYSTEM:CONSOLE")
#define BUFFER_SIZE 500
/*服务端代码
*/
int main()
{
int err;
int len;
SOCKET sListen; /*监听套接字*/
SOCKET sConnect; /*用于建立连接的套接字*/
WSADATA wsaD;
struct sockaddr_in my_addr;
u_short port; /*监听端口*/
char buf[BUFFER_SIZE];
struct sockaddr_in addr; /*客户机的网络地址*/
int addrlen; /*地址长度*/
printf("Please input Port:\n");
scanf("%hu",&port);
err = WSAStartup(MAKEWORD(1,1),&wsaD); /* 初始化Winsock */
if((sListen = socket(AF_INET,SOCK_STREAM,IPPROTO_TCP)) == SOCKET_ERROR){ /* 创建套接字s */
err = WSAGetLastError();
printf("%d socket error!",err);
return -1;
}
memset(&my_addr,0,sizeof(my_addr)); /* 清空sockaddr结构 */
my_addr.sin_family = AF_INET;
my_addr.sin_port = htons(port);
my_addr.sin_addr.s_addr = htonl(INADDR_ANY);
if(bind(sListen,(struct sockaddr *) &my_addr,sizeof(my_addr)) == SOCKET_ERROR) /* 绑定 */
{
err = WSAGetLastError();
printf("Error:%d Failed to bind!\n",err);
return -1;
}
if(listen(sListen,5) == SOCKET_ERROR) /* 启动监听 */
{
err = WSAGetLastError();
printf("Error:%d Failed to listen!\n",err);
return -1;
}
printf("Listening on port %d\n",ntohs(my_addr.sin_port));
addrlen = sizeof(addr);
if((sConnect = accept(sListen,(struct sockaddr *) &addr,&addrlen)) != INVALID_SOCKET)
printf("%s has connected to this server.\n",inet_ntoa(addr.sin_addr));
while(1){
memset(buf,0,sizeof(buf));
len = recv(sConnect,buf,sizeof(buf),0); /*接收数据*/
if (len > 0)
{
printf("%s",buf);
}
else if (len==0)
{
closesocket(sConnect);
break;
}
}
WSACleanup();
return 0;
}