C/S模式

1. 基于TCP协议的C/S模式

Server

#include <iostream>
#include <WinSock2.h>      //网络头文件
using namespace std;
#pragma comment(lib, "WS2_32.lib")   //网络库
int main()
{
 WSADATA wsaData;
 //打开网络库
 if (WSAStartup(MAKEWORD(2, 2), &wsaData) != 0)      
 {
  cout << "WSAStartup 无法初始化" << endl;
  return 0;
 }
 //校验版本
 if (2 != HIBYTE(wsaData.wVersion) || 2 != LOBYTE(wsaData.wVersion))
 {
  //说明版本不对，清理网络库
  WSACleanup();
  return 0;
 }
 //创建Socket
 SOCKET socket_server = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
 if (socket_server == INVALID_SOCKET)
 {
  cout << "创建Socket无效" << endl;
  WSACleanup();
  return 0;
 }
 //绑定地址与端口
 SOCKADDR_IN addr;
 int addr_len = sizeof(SOCKADDR_IN);
 int port = 9901;
 addr.sin_family = AF_INET;
 addr.sin_port = htons(port);
 addr.sin_addr.S_un.S_addr = inet_addr("127.0.0.1");
 if (bind(socket_server, (const SOCKADDR*)&addr, addr_len) == SOCKET_ERROR)
 {
  cout << "绑定失败" << endl;
  closesocket(socket_server);
  WSACleanup();
  return 0;
 }
 //开始监听
 if (listen(socket_server, SOMAXCONN) == SOCKET_ERROR)
 {
  cout << "监听失败" << endl;
  closesocket(socket_server);
  WSACleanup();
  return 0;
 }
 //创建客户端socket
 SOCKET socket_client;
 SOCKADDR_IN from;
 int len = sizeof(from);
 socket_client = accept(socket_server, (SOCKADDR*)&from, &len);
 if (socket_client == INVALID_SOCKET)
 {
  cout << "创建客户端socket失败" << endl;
  closesocket(socket_server);
  WSACleanup();
  return 0;
 }
 //与客户端收发消息
 char buf[1500];
 int buf_len = 1024;
 while (1)
 {
  ZeroMemory(buf, sizeof(buf));
  if (0 == recv(socket_client, buf, buf_len, 0))
  {
   cout << "连接已关闭" << endl;
   closesocket(socket_server);
   WSACleanup();
   return 0;
  }
  cout << buf << endl;
  if (strcmp(buf, "quit") == 0)
  {
   break;
  }
 }
 closesocket(socket_server);
 closesocket(socket_client);
 WSACleanup();
 system("pause");
 return 0;
}

Client

#include <iostream>
#include <WinSock2.h>
using namespace std;
#pragma comment(lib, "WS2_32.lib")
int main()
{
 //打开网络库
 WSADATA WsaData;
 if( WSAStartup(MAKEWORD(2,2), &WsaData) != 0 )
 {
  cout << "WsaData无法初始化" << endl;
 }
 //校验版本
 if ( 2 != HIBYTE(WsaData.wVersion) || 2 != LOBYTE(WsaData.wVersion) )
 {
  //说明版本不对，清理网络库
  WSACleanup();
  return 0;
 }
 //创建套接字
 SOCKET socket_server = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
 if (socket_server == INVALID_SOCKET)
 {
  cout << "创建Socket无效" << endl;
  WSACleanup();
  return 0;
 }
 //连接到服务器
 //需要服务器的ip地址和端口号
 SOCKADDR_IN addr;
 addr.sin_family = AF_INET;
 addr.sin_port = htons(9901);
 addr.sin_addr.S_un.S_addr = inet_addr("127.0.0.1");
 if ( connect(socket_server, (SOCKADDR*)&addr, sizeof(addr)) == SOCKET_ERROR )
 {
  cout << "连接服务器失败" << endl;
  WSACleanup();
  return 0;
 }
 while (1)
 {
  char buf[1400];
  cin >> buf;
  if (strcmp(buf, "quit") == 0)
  {
   send(socket_server, buf, strlen(buf), 0);
   break;
  }
  send(socket_server, buf, strlen(buf), 0);
 } 
 closesocket(socket_server);
 WSACleanup();
 system("pause");
 return 0;
}

2.基于UDP协议的C/S模式

Server

#include <iostream>
#include <WinSock2.h>
using namespace std;
#pragma comment(lib, "WS2_32.lib")

int main()
{
 //打开网络库
 WSADATA wsaData;
 if (WSAStartup(MAKEWORD(2,2), &wsaData) != 0)
 {
  cout << "打开网络库失败" << endl;
  return 0;
 }
 //创建套接字
 SOCKET server_socket = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);

 //绑定套接字
 SOCKADDR_IN addr;
 addr.sin_family = AF_INET;
 addr.sin_port = htons(9901);
 addr.sin_addr.S_un.S_addr = inet_addr("192.168.100.140");
 if(bind(server_socket, (SOCKADDR*)&addr, sizeof(addr)) == SOCKET_ERROR)
 {
  cout << "绑定套接字失败!!!" <<endl;
  closesocket(server_socket);
  WSACleanup();
  return 0;
 }
 while (true)
 {
  char buf[1500];
  ZeroMemory(buf, sizeof(buf));
  //发送数据的主机地址
  SOCKADDR_IN client_addr;
  int len = sizeof(client_addr);
  recvfrom(server_socket, buf, sizeof(buf), 0, (SOCKADDR*)&client_addr, &len);
  cout << buf << endl;
  if (strcmp(buf, "quit") == 0)
  {
   break;
  }
 }
 

 closesocket(server_socket);
 WSACleanup();
 system("pause");
 return 0;
}

 

Client

#include <iostream>
#include <WinSock2.h>
using namespace std;
#pragma comment(lib, "WS2_32.lib")

int main()
{
 //打开网络库
 WSADATA WsaData;
 if (WSAStartup(MAKEWORD(2,2), &WsaData) != 0)
 {
  cout << "打开网络库失败" << endl;
  return 0;
 }

 //创建套接字
 SOCKET server_socket = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
 if (server_socket == INVALID_SOCKET)
 {
  cout << "创建socket失败" << endl;
  WSACleanup();
  return 0;
 }

 //发送数据
 SOCKADDR_IN addr;
 addr.sin_family = AF_INET;
 addr.sin_port = htons(9901);
 addr.sin_addr.S_un.S_addr = inet_addr("192.168.100.140");

 while (true)
 {
  char buf[1400];
  cin >> buf;
  sendto(server_socket, buf, strlen(buf), 0, (SOCKADDR*)&addr, sizeof(addr));
  if (strcmp(buf, "quit") == 0)
  {
   break;
  }
 }
 

 closesocket(server_socket);
 WSACleanup();
 system("pause");
 return 0;
}