分析一个基于windows的客户端和服务器端程序

服务器端源码：

#include <stdio.h>
#include <Winsock2.h>
#pragma comment (lib,"ws2_32.lib")

int main()
{

WORD wVersionRequested;
WSADATA wsaData;
int err;

wVersionRequested = MAKEWORD( 2, 2 );

err = WSAStartup( wVersionRequested, &wsaData );
if ( err != 0 ) {
return 0;
}

if ( LOBYTE( wsaData.wVersion ) != 2 ||HIBYTE( wsaData.wVersion ) != 2 ) {
WSACleanup( );
return 0;
}

SOCKET  socketServer=socket(AF_INET,SOCK_STREAM,0);

SOCKADDR_IN  addrServer;

addrServer.sin_family=AF_INET;

addrServer.sin_addr.S_un.S_addr=htonl(INADDR_ANY);

addrServer.sin_port=htons(6000);

bind(socketServer, (struct sockaddr *)&addrServer, sizeof(struct sockaddr));

listen(socketServer, 5);

SOCKADDR_IN  addrClient;

int addrLen=sizeof(SOCKADDR_IN);

char sendBuf[100];

char recvBuf[100];

int i=1;
while(1)
{
printf("服务器端等待第%d个客户端连接请求...\n", i++);

SOCKET newsocketServer=accept(socketServer,(struct sockaddr *)&addrClient, &addrLen);

if(newsocketServer!=INVALID_SOCKET)
{
printf("服务器端与客户端连接成功...\n");
}

memset(sendBuf,0,100);

sprintf(sendBuf,"Welcome you to come here");

send(newsocketServer, sendBuf, strlen(sendBuf)+1,0);

memset(recvBuf,0,100);

recv(newsocketServer,recvBuf,100,0);

printf("服务器端收到信息:%s\n",recvBuf);

closesocket(newsocketServer);
}

WSACleanup();

return 0;
}

此文章来自于个人博客： 阿浪博客     http://blog.163.com/wenxianliang08@126/ 
客户端源码：

#include <stdio.h>
#include <Winsock2.h>
#pragma comment (lib,"ws2_32.lib")

int main()
{

WORD wVersionRequested;
WSADATA wsaData;
int err;

wVersionRequested = MAKEWORD( 2, 2 );

err = WSAStartup( wVersionRequested, &wsaData );
if ( err != 0 ) {
return 0;
}

if ( LOBYTE( wsaData.wVersion ) != 2 ||HIBYTE( wsaData.wVersion ) != 2 ) {
WSACleanup( );
return 0;
}

SOCKET  socketClient=socket(AF_INET,SOCK_STREAM,0);    //UDP使用SOCK_DGRAM

SOCKADDR_IN  addrServer;

addrServer.sin_family=AF_INET;

addrServer.sin_addr.S_un.S_addr=inet_addr("127.0.0.1");

addrServer.sin_port=htons(6000);

char sendBuf[100];

char recvBuf[100];

printf("客户端向服务器端连接请求...\n");

int Isconnect=connect(socketClient, (struct sockaddr *)&addrServer, sizeof(struct sockaddr));

if(Isconnect!=0)
{
printf("客户端无法连接服务器端...\n");

return 0;
}

printf("客户端已成功连接服务器端...\n");

memset(recvBuf,0,100);

recv(socketClient,recvBuf,100,0);

printf("客户端收到信息:%s\n",recvBuf);

memset(sendBuf,0,100);  //清空sendBuf

sprintf(sendBuf,"Hello , I am Mr Wen !");

send(socketClient, sendBuf, strlen(sendBuf)+1,0);

closesocket(socketClient);

WSACleanup();

return 0;
}

UDP模型见下：