最近整理一下之前写过的一些东西，就从这里开始吧~
服务端结构： 1.使用socket函数获取套接字 1
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echo_soc = socket(AF_INET,SOCK_STREAM,0 );
echo_soc的值可以看做服务器端打开的一个通道 。
2.使用bind函数将一本地地址与套接口捆绑 1
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result = bind(echo_soc,( struct sockaddr*)&serv_addr,sizeof (serv_addr));
3.listen监听端口 1
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listen(echo_soc, SOMAXCONN);
附：
msdn原文第二个参数:
Maximum length of the queue of pending connections. If set to SOMAXCONN, the underlying service provider responsible for socket s will set the backlog to a maximum reasonable value. There is no standard provision to obtain the actual backlog value.
4.监听开始后服务端启动 通过accept函数接受套接字用recv和send函数收发数据1
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while (1 )
{
acpt_soc = accept(echo_soc,( struct sockaddr*)&clnt_addr,&addr_len);
if (acpt_soc == INVALID_SOCKET)
{
printf ( "[Echo Sever] accept error: %d\n" ,WSAGetLastError());
break ;
}
result = recv(acpt_soc, recv_buf, ECHO_BUF_SIZE,0 );
if (result > 0 )
{
recv_buf[result] = 0 ;
printf ( "[Echo Sever] receives: \"%s\",from %s\r\n" ,
recv_buf, inet_ntoa(clnt_addr.sin_addr));
result = send(acpt_soc, recv_buf, result,0 );
}
closesocket(acpt_soc);
}
关于服务端先到这里= =
下面是服务端完整源码：1
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#include <stdio.h>
#include <winsock2.h>
#pragma comment(lib,"ws2_32" )
#define ECHO_DEF_PORT 7
#define ECHO_BUF_SIZE 256
int main (int argc,char **argv)
{
WSADATA wsa_data;
SOCKET echo_soc = 0 ,
acpt_soc = 0 ;
struct sockaddr_in serv_addr ,
clnt_addr ;
unsigned short port = ECHO_DEF_PORT;
int result = 0 ;
int addr_len = sizeof (struct sockaddr_in);
char recv_buf[ECHO_BUF_SIZE];
if (argc == 2 )
port = atoi(argv[1 ]);
WSAStartup(MAKEWORD(2 ,2 ),&wsa_data);
echo_soc = socket(AF_INET,SOCK_STREAM,0 );
serv_addr.sin_family = AF_INET;
serv_addr.sin_port = htons(port);
serv_addr.sin_addr.s_addr = INADDR_ANY;
result = bind(echo_soc,(struct sockaddr*)&serv_addr,sizeof (serv_addr));
if (result == SOCKET_ERROR)
{
printf ("[Echo Sever] bind error: %d\n" , WSAGetLastError());
closesocket(echo_soc);
return -1 ;
}
listen(echo_soc, SOMAXCONN);
printf ("[Echo Sever] is running ……\n" );
while (1 )
{
acpt_soc = accept(echo_soc,(struct sockaddr*)&clnt_addr,&addr_len);
if (acpt_soc == INVALID_SOCKET)
{
printf ("[Echo Sever] accept error: %d\n" ,WSAGetLastError());
break ;
}
result = recv(acpt_soc, recv_buf, ECHO_BUF_SIZE,0 );
if (result > 0 )
{
recv_buf[result] = 0 ;
printf ("[Echo Sever] receives: \"%s\",from %s\r\n" ,
recv_buf, inet_ntoa(clnt_addr.sin_addr));
result = send(acpt_soc, recv_buf, result,0 );
}
closesocket(acpt_soc);
}
closesocket(acpt_soc);
WSACleanup();
return 0 ;
}
客户端结构： 1.使用socket函数获取套接字 1
echo_soc = socket(AF_INET,SOCK_STREAM,0 );
2.使用connect函数与服务器进行连接 1
2
result = connect(echo_soc,( struct sockaddr *)&serv_addr,sizeof (serv_addr));
附：
第二个参数为一结构体指针其中包含服务器的ip地址端口号等信息，在本程序中端口号在宏定义中确定，ip地址从命令行获得。
3.使用send与recv函数进行数据收发 1
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result = send(echo_soc,test_data,send_len,0 );
result = recv(echo_soc,recv_buf,ECHO_BUF_SIZE,0 );
附： 1
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if (result > 0 ){
recv_buf[result] = 0 ;
printf ( "[ECHO Client] receives: \"%s\"\r\n" ,recv_buf);
}
else
printf ( "[ECHO Client] error: %d.\"\r\n" ,WSAGetLastError());
下面是客户端完整源码：1
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#include <stdio.h>
#include <stdlib.h>
#include <WINSOCK2.H>
#pragma comment(lib,"ws2_32" )
#define ECHO_DEF_PORT 7
#define ECHO_BUF_SIZE 256
int main (int argc, char **argv)
WSADATA wsa_data;
SOCKET echo_soc = 0 ;
struct sockaddr_in serv_addr ;
unsigned short port = ECHO_DEF_PORT;
int result = 0 , send_len = 0 ;
char *test_data = "Hello World!" , recv_buf[ECHO_BUF_SIZE];
if (argc < 2 ){
printf ("input %s server_address [port]\n" ,argv[0 ]);
return -1 ;
}
if (argc >2 )
port = atoi(argv[2 ]);
WSAStartup(MAKEWORD(2 ,2 ),&wsa_data);
send_len = strlen (test_data);
serv_addr.sin_family = AF_INET;
serv_addr.sin_port = htons(port);
serv_addr.sin_addr.s_addr = inet_addr(argv[1 ]);
if (serv_addr.sin_addr.s_addr == INADDR_NONE){
printf ("[ECHO] invalid address\n" );
return -1 ;
}
echo_soc = socket(AF_INET,SOCK_STREAM,0 );
result = connect(echo_soc,(struct sockaddr *)&serv_addr,sizeof (serv_addr));
if (result == 0 ){
result = send(echo_soc,test_data,send_len,0 );
result = recv(echo_soc,recv_buf,ECHO_BUF_SIZE,0 );
}
if (result > 0 ){
recv_buf[result] = 0 ;
printf ("[ECHO Client] receives: \"%s\"\r\n" ,recv_buf);
}
else
printf ("[ECHO Client] error: %d.\"\r\n" ,WSAGetLastError());
closesocket(echo_soc);
WSACleanup();
return 0 ;
}
附录： 1
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typedef struct in_addr {
union {
struct {
struct {
ULONG S_addr;
} S_un;
#define s_addr S_un.S_addr
#define s_host S_un.S_un_b.s_b2
#define s_net S_un.S_un_b.s_b1
#define s_imp S_un.S_un_w.s_w2
#define s_impno S_un.S_un_b.s_b4
#define s_lh S_un.S_un_b.s_b3
} IN_ADDR, *PIN_ADDR, FAR *LPIN_ADDR;
就这么多了=。=
