VC中的socket编程

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基于TCP的socket编程

服务器端程序：

1、创建socket

2、将套接字绑定到一个本地地址和端口上bind

3、将套接字设为监听模式，准备接受客户请求listen

4、等待客户请求到来；当请求到来后，结合搜此次连接的套接字accept

5、用返回的套接字和客户端进行通信send/recv

6、返回，等待另一客户请求。

7、关闭套接字。

源码：

#pragma comment(lib, "ws2_32.lib ")

#include <Winsock2.h>
#include <stdio.h>
void main()
{
WORD wVersionRequested;
WSADATA wsaData;
int err;

wVersionRequested = MAKEWORD( 2, 2 );

err = WSAStartup( wVersionRequested, &wsaData );
if ( err != 0 ) {
  /* Tell the user that we could not find a usable */
  /* WinSock DLL.                                  */
  return;
}

/* Confirm that the WinSock DLL supports 2.2.*/
/* Note that if the DLL supports versions greater    */
/* than 2.2 in addition to 2.2, it will still return */
/* 2.2 in wVersion since that is the version we      */
/* requested.                                        */

if ( LOBYTE( wsaData.wVersion ) != 2 ||
        HIBYTE( wsaData.wVersion ) != 2 ) {
  /* Tell the user that we could not find a usable */
  /* WinSock DLL.                                  */
  WSACleanup( );
  return;
}
    SOCKET sockSrv=socket(AF_INET,SOCK_STREAM,0);

SOCKADDR_IN addrSrv;
addrSrv.sin_addr.S_un.S_addr=htonl(INADDR_ANY);
addrSrv.sin_family=AF_INET;
addrSrv.sin_port=htons(6000);

bind(sockSrv,(SOCKADDR*)&addrSrv,sizeof(SOCKADDR));

listen(sockSrv,5);

SOCKADDR_IN addrClient;
int len=sizeof(SOCKADDR);

while(1)
{
  SOCKET sockConn=accept(sockSrv,(SOCKADDR*)&addrClient,&len);
  char sendBuf[100];
  sprintf(sendBuf,"welcome %s to me",
  inet_ntoa(addrClient.sin_addr));
  send(sockConn,sendBuf,strlen(sendBuf)+1,0);
  char recvBuf[100];
  recv(sockConn,recvBuf,100,0);
  printf("%s/n",recvBuf);
  closesocket(sockConn);

}

}

客户端程序：

1、创建套接字socket

2、想服务器发出连接请求connect

3、和服务器进行通信send/recv

4、关闭套接字。

源码：

#pragma comment(lib, "ws2_32.lib ")

SOCKADDR_IN addrSrv;
addrSrv.sin_addr.S_un.S_addr=inet_addr("127.0.0.1");
addrSrv.sin_family=AF_INET;
addrSrv.sin_port=htons(6000);
connect(sockClient,(SOCKADDR*)&addrSrv,sizeof(SOCKADDR));

char recvBuf[100];
recv(sockClient,recvBuf,100,0);
printf("%s/n",recvBuf);
send(sockClient,"this is zhouyang",strlen("this is zhouyang")+1,0);

closesocket(sockClient);
WSACleanup();
}

基于UDP的socket编程

服务器端：

1、创建socket

2、将套接字绑定到一个本地地址和端口上bind

3、等待接受数据receive from

4、关闭套接字。

代码：
#include <Winsock2.h>
#include <stdio.h>
void main()
{
WORD wVersionRequested;
WSADATA wsaData;
int err;

wVersionRequested = MAKEWORD( 2, 2 );

err = WSAStartup( wVersionRequested, &wsaData );
if ( err != 0 ) {
  /* Tell the user that we could not find a usable */
  /* WinSock DLL.                                  */
  return;
}

/* Confirm that the WinSock DLL supports 2.2.*/
/* Note that if the DLL supports versions greater    */
/* than 2.2 in addition to 2.2, it will still return */
/* 2.2 in wVersion since that is the version we      */
/* requested.                                        */

if ( LOBYTE( wsaData.wVersion ) != 2 ||
        HIBYTE( wsaData.wVersion ) != 2 ) {
  /* Tell the user that we could not find a usable */
  /* WinSock DLL.                                  */
  WSACleanup( );
  return;
}

  SOCKET socketSrv=socket(AF_INET,SOCK_DGRAM,0);
  SOCKADDR_IN addrSrv;
  addrSrv.sin_addr.S_un.S_addr=htonl(INADDR_ANY);
  addrSrv.sin_family=AF_INET;
  addrSrv.sin_port=htons(6000);

bind(socketSrv,(SOCKADDR*)&addrSrv,sizeof(SOCKADDR));

SOCKADDR_IN addrClient;
int len=sizeof(SOCKADDR);
char recvBuf[100];

recvfrom(socketSrv,recvBuf,100,0,(SOCKADDR*)&addrClient,&len);
printf("%s/n",recvBuf);
closesocket(socketSrv);
WSACleanup();

}

客户端程序：

1、创建套接字socket

2、向服务器发送数据

3、关闭套接字

SOCKET sockClient=socket(AF_INET,SOCK_DGRAM,0);
SOCKADDR_IN addrSrv;
addrSrv.sin_addr.S_un.S_addr=inet_addr("127.0.0.1");
addrSrv.sin_family=AF_INET;
addrSrv.sin_port=htons(6000);

sendto(sockClient,"Hello Visionsky",
  strlen("Hello Visionsky")+1,0,
  (SOCKADDR*)&addrSrv,sizeof(SOCKADDR));
closesocket(sockClient);
    WSACleanup();

}

注意：先启动服务器端，在启动客户端，另还需添加ws2_32.lib~