l使用Winsock API编制的网络应用程序中，在调用任何一个Winsock函数之前都必须检查协议栈安装情况。因此多出了了一个WSAStartup这个函数。

服务器端代码：

Winsock启动，创建socket，bind绑定协议族、端口号和IP地址，listen等待客户端连接

SOCKET ser_init()
{int ret = 0;WORD wVersionRequested;WSADATA wsaData;struct sockaddr_in server_addr = {0};wVersionRequested = MAKEWORD( 2, 2 );ret = WSAStartup(wVersionRequested, &wsaData);if ( ret != 0 ) {return -1;}if (wsaData.wVersion != wVersionRequested){WSACleanup( );return -1; }SOCKET sfd;sfd = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);if (sfd == INVALID_SOCKET){cout<<"1error with code = "<<WSAGetLastError()<<endl;exit(1);}cout<<"socket success..."<<endl;server_addr.sin_family = AF_INET;server_addr.sin_port = htons(6666);server_addr.sin_addr.s_addr = htonl(INADDR_ANY);int opt = 1;ret = setsockopt(sfd, SOL_SOCKET, SO_REUSEADDR, (char*)&opt, sizeof(opt));if (ret == SOCKET_ERROR){cout<<"2error with code = "<<WSAGetLastError()<<endl;exit(1);}ret = bind(sfd, (struct sockaddr*)&server_addr, sizeof(struct sockaddr));if (ret == SOCKET_ERROR){cout<<"3error with code = "<<WSAGetLastError()<<endl;exit(1);}cout<<"bind success..."<<endl;ret = listen(sfd, 10);if (ret == SOCKET_ERROR){cout<<"4error with code = "<<WSAGetLastError()<<endl;exit(1);}cout<<"listen success..."<<endl;return sfd;
}

accept接受客户端连接请求

SOCKET ser_acpt(SOCKET fd)
{SOCKET cfd;int len = sizeof(struct sockaddr);struct sockaddr_in client_addr = {0};cfd = accept(fd, (struct sockaddr*)&client_addr, &len);if (cfd == INVALID_SOCKET){cout<<"5error with code = "<<WSAGetLastError()<<endl;exit(1);}cout<<"accept success..."<<endl; cout<<inet_ntoa(client_addr.sin_addr)<< "\t"<<ntohs(client_addr.sin_port)<<endl;return cfd;
}

main函数

int main()
{SOCKET fd,cfd;fd = ser_init();HANDLE hthread;          //定义一个句柄，用来接收线程创建的返回值，成功返回true，失败返回falseDWORD tid;               //创建的线程的ID号while (1){cfd = ser_acpt(fd);hthread = CreateThread(NULL, 0, request, (LPVOID)cfd, 0, &tid);if (false == hthread){cout<<"create thread error"<<GetLastError<<endl;}WaitForSingleObject(hthread, 0);CloseHandle(hthread);}closesocket(cfd);WSACleanup();return 0;
}

客户端同样也多出了启动Winsock的操作，相比于服务器，客户端在创建socket后，就立马进入到connect状态
客户端初始化：

SOCKET cli_init()
{int ret = 0;WORD wVersionRequested;WSADATA wsaData;wVersionRequested = MAKEWORD( 2, 2 );ret = WSAStartup(wVersionRequested, &wsaData);if ( ret != 0 ){return -1;}if (wsaData.wVersion != wVersionRequested) {WSACleanup();return -1; }SOCKET cfd;struct sockaddr_in server_addr = {0};cfd = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);if (cfd == INVALID_SOCKET){cout<<"1error with code = "<<WSAGetLastError()<<endl;exit(1);}server_addr.sin_family = AF_INET;server_addr.sin_port = htons(6666);server_addr.sin_addr.s_addr = inet_addr("127.0.0.1");ret = connect(cfd, (struct sockaddr*)&server_addr, sizeof(server_addr));if (ret == -1){cout<<"2error with code = "<<WSAGetLastError()<<endl;exit(1);}return cfd;
}

main函数：

int main()
{int ret = 0;SOCKET fd;fd = cli_init();WSACleanup();
}

服务器和客户端搭建好后，就到了客户端发请求给服务器，服务器处理请求，并返回处理结果给客户端。此次服务器端存储数据用了Mysql数据库，相比于在Linux下使用的小型数据库sqlite3, Mysql的功能非常强大，不但能实现多表查询，而且包含很多数据类型，查询语句丰富等等。这次就先到这里，后续会不断更新。