计算机网络作业
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控制台发消息,client–server–client
client程序代码
//#include "stdafx.h"#define _WINSOCK_DEPRECATED_NO_WARNINGS#include <WinSock2.h>#include <process.h>#include <stdio.h>#include <stdlib.h>#include <conio.h>#pragma comment(lib,"ws2_32.lib")#define RECV_OVER 1#define RECV_YET 0char userName[16] = { 0 };int iStatus = RECV_YET;//接受数据unsigned __stdcall ThreadRecv(void* param){ char buf[128] = { 0 }; while (1) { int ret = recv(*(SOCKET*)param, buf, sizeof(buf), 0); if (ret == SOCKET_ERROR) { Sleep(500); continue; } if (strlen(buf) != 0) { printf("%s\n", buf); iStatus = RECV_OVER; } else Sleep(100); } return 0;}//发送数据unsigned __stdcall ThreadSend(void* param){ char buf[128] = { 0 }; int ret = 0; while (1) { int c = getch(); if (c == 72 || c == 0 || c == 68)//为了显示美观,加一个无回显的读取字符函数 continue; //getch返回值我是经过实验得出如果是返回这几个值,则getch就会自动跳过,具体我也不懂。 printf("%s: ", userName); gets_s(buf); ret = send(*(SOCKET*)param, buf, sizeof(buf), 0); if (ret == SOCKET_ERROR) return 1; } return 0;}//连接服务器int ConnectServer(){ WSADATA wsaData = { 0 };//存放套接字信息 SOCKET ClientSocket = INVALID_SOCKET;//客户端套接字 SOCKADDR_IN ServerAddr = { 0 };//服务端地址 USHORT uPort ;//服务端端口 //初始化套接字 if (WSAStartup(MAKEWORD(2, 2), &wsaData)) { printf("WSAStartup failed with error code: %d\n", WSAGetLastError()); return -1; } //判断套接字版本 if (LOBYTE(wsaData.wVersion) != 2 || HIBYTE(wsaData.wVersion) != 2) { printf("wVersion was not 2.2\n"); return -1; } //创建套接字 ClientSocket = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP); if (ClientSocket == INVALID_SOCKET) { printf("socket failed with error code: %d\n", WSAGetLastError()); return -1; } //输入服务器IP printf("说明:\n"); printf("1.服务器IP地址是打开《server.exe》的设备的ipv4.\n"); printf("2.用的时候电脑可能比较卡顿(找不到原因).\n"); printf("3.用Visual Studio 2015 运行的,不知道会不会存在链接库版本问题.\n"); printf("\n"); printf("请输入服务器的IP地址:"); char IP[32] = { 0 }; gets_s(IP); printf("请输入服务端口(请确保端口没被占用!):"); scanf("%d", &uPort); //printf("%d", uPort); getchar(); //设置服务器地址 ServerAddr.sin_family = AF_INET; ServerAddr.sin_port = htons(uPort);//服务器端口 ServerAddr.sin_addr.S_un.S_addr = inet_addr(IP);//服务器地址 printf("connecting......\n"); //连接服务器 if (SOCKET_ERROR == connect(ClientSocket, (SOCKADDR*)&ServerAddr, sizeof(ServerAddr))) { printf("connect failed with error code: %d\n", WSAGetLastError()); closesocket(ClientSocket); WSACleanup(); return -1; } printf("Connecting server successfully IP:%s Port:%d\n", IP, htons(ServerAddr.sin_port)); printf("Please input your UserName: "); gets_s(userName); send(ClientSocket, userName, sizeof(userName), 0); printf("\n\n"); _beginthreadex(NULL, 0, ThreadRecv, &ClientSocket, 0, NULL); //启动接收和发送消息线程 _beginthreadex(NULL, 0, ThreadSend, &ClientSocket, 0, NULL); for (int k = 0; k < 1000; k++) Sleep(10000000); closesocket(ClientSocket); WSACleanup(); return 0;}int main(){ ConnectServer(); //连接服务器 return 0;}
server程序代码
//#include "stdafx.h"#include <WinSock2.h>#include <process.h>#include <stdio.h>#include <stdlib.h>#pragma comment(lib,"ws2_32.lib")#define SEND_OVER 1 //已经转发消息#define SEND_YET 0 //还没转发消息int g_iStatus = SEND_YET;SOCKET g_ServerSocket = INVALID_SOCKET; //服务端套接字SOCKADDR_IN g_ClientAddr = { 0 }; //客户端地址int g_iClientAddrLen = sizeof(g_ClientAddr);bool g_bCheckConnect = false; //检查连接情况HANDLE g_hRecv1 = NULL;HANDLE g_hRecv2 = NULL;//客户端信息结构体typedef struct _Client{ SOCKET sClient; //客户端套接字 char buf[128]; //数据缓冲区 char userName[16]; //客户端用户名 char IP[20]; //客户端IP UINT_PTR flag; //标记客户端,用来区分不同的客户端}Client;Client g_Client[2] = { 0 }; //创建一个客户端结构体 //发送数据线程unsigned __stdcall ThreadSend(void* param){ int ret = 0; int flag = *(int*)param; SOCKET client = INVALID_SOCKET; //创建一个临时套接字来存放要转发的客户端套接字 char temp[128] = { 0 }; //创建一个临时的数据缓冲区,用来存放接收到的数据 memcpy(temp, g_Client[!flag].buf, sizeof(temp)); sprintf(g_Client[flag].buf, "%s: %s", g_Client[!flag].userName, temp);//添加一个用户名头 if (strlen(temp) != 0 && g_iStatus == SEND_YET) //如果数据不为空且还没转发则转发 ret = send(g_Client[flag].sClient, g_Client[flag].buf, sizeof(g_Client[flag].buf), 0); if (ret == SOCKET_ERROR) return 1; g_iStatus = SEND_OVER; //转发成功后设置状态为已转发 return 0;}//接受数据unsigned __stdcall ThreadRecv(void* param){ SOCKET client = INVALID_SOCKET; int flag = 0; if (*(int*)param == g_Client[0].flag) //判断是哪个客户端发来的消息 { client = g_Client[0].sClient; flag = 0; } else if (*(int*)param == g_Client[1].flag) { client = g_Client[1].sClient; flag = 1; } char temp[128] = { 0 }; //临时数据缓冲区 while (1) { memset(temp, 0, sizeof(temp)); int ret = recv(client, temp, sizeof(temp), 0); //接收数据 if (ret == SOCKET_ERROR) continue; g_iStatus = SEND_YET; //设置转发状态为未转发 flag = client == g_Client[0].sClient ? 1 : 0; //这个要设置,否则会出现自己给自己发消息的BUG memcpy(g_Client[!flag].buf, temp, sizeof(g_Client[!flag].buf)); _beginthreadex(NULL, 0, ThreadSend, &flag, 0, NULL); //开启一个转发线程,flag标记着要转发给哪个客户端 //这里也可能是导致CPU使用率上升的原因。 } return 0;}//管理连接unsigned __stdcall ThreadManager(void* param){ while (1) { if (send(g_Client[0].sClient, "", sizeof(""), 0) == SOCKET_ERROR) { if (g_Client[0].sClient != 0) { CloseHandle(g_hRecv1); //这里关闭了线程句柄,但是测试结果断开连C/S接后CPU仍然疯涨 CloseHandle(g_hRecv2); printf("Disconnect from IP: %s,UserName: %s\n", g_Client[0].IP, g_Client[0].userName); closesocket(g_Client[0].sClient); //这里简单的判断:若发送消息失败,则认为连接中断(其原因有多种),关闭该套接字 g_Client[0] = { 0 }; } } if (send(g_Client[1].sClient, "", sizeof(""), 0) == SOCKET_ERROR) { if (g_Client[1].sClient != 0) { CloseHandle(g_hRecv1); CloseHandle(g_hRecv2); printf("Disconnect from IP: %s,UserName: %s\n", g_Client[1].IP, g_Client[1].userName); closesocket(g_Client[1].sClient); g_Client[1] = { 0 }; } } Sleep(2000); //2s检查一次 } return 0;}//接受请求unsigned __stdcall ThreadAccept(void* param){ int i = 0; int temp1 = 0, temp2 = 0; _beginthreadex(NULL, 0, ThreadManager, NULL, 0, NULL); while (1) { while (i < 2) { if (g_Client[i].flag != 0) { ++i; continue; } //如果有客户端申请连接就接受连接 if ((g_Client[i].sClient = accept(g_ServerSocket, (SOCKADDR*)&g_ClientAddr, &g_iClientAddrLen)) == INVALID_SOCKET) { printf("accept failed with error code: %d\n", WSAGetLastError()); closesocket(g_ServerSocket); WSACleanup(); return -1; } recv(g_Client[i].sClient, g_Client[i].userName, sizeof(g_Client[i].userName), 0); //接收用户名 printf("Successfuuly got a connection from IP:%s ,UerName: %s\n", inet_ntoa(g_ClientAddr.sin_addr), g_Client[i].userName); memcpy(g_Client[i].IP, inet_ntoa(g_ClientAddr.sin_addr), sizeof(g_Client[i].IP)); //记录客户端IP g_Client[i].flag = g_Client[i].sClient; //不同的socke有不同UINT_PTR类型的数字来标识 i++; } i = 0; if (g_Client[0].flag != 0 && g_Client[1].flag != 0) //当两个用户都连接上服务器后才进行消息转发 { if (g_Client[0].flag != temp1) //每次断开一个连接后再次连上会新开一个线程,导致cpu使用率上升,所以要关掉旧的 { if (g_hRecv1) //这里关闭了线程句柄,但是测试结果断开连C/S接后CPU仍然疯涨 CloseHandle(g_hRecv1); g_hRecv1 = (HANDLE)_beginthreadex(NULL, 0, ThreadRecv, &g_Client[0].flag, 0, NULL); //开启2个接收消息的线程 } if (g_Client[1].flag != temp2) { if (g_hRecv2) CloseHandle(g_hRecv2); g_hRecv2 = (HANDLE)_beginthreadex(NULL, 0, ThreadRecv, &g_Client[1].flag, 0, NULL); } } temp1 = g_Client[0].flag; //防止ThreadRecv线程多次开启 temp2 = g_Client[1].flag; Sleep(2000); } return 0;}//启动服务器int StartServer(){ //存放套接字信息的结构 WSADATA wsaData = { 0 }; SOCKADDR_IN ServerAddr = { 0 }; //服务端地址 USHORT uPort; //服务器监听端口 //printf("%d",uPort); //初始化套接字 if (WSAStartup(MAKEWORD(2, 2), &wsaData)) { printf("WSAStartup failed with error code: %d\n", WSAGetLastError()); return -1; } //判断版本 if (LOBYTE(wsaData.wVersion) != 2 || HIBYTE(wsaData.wVersion) != 2) { printf("wVersion was not 2.2\n"); return -1; } //创建套接字 g_ServerSocket = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP); if (g_ServerSocket == INVALID_SOCKET) { printf("socket failed with error code: %d\n", WSAGetLastError()); return -1; } printf("请输入服务端口(请确保端口没被占用!):"); scanf("%d", &uPort); printf("输入的端口为:%d", uPort); printf("\n"); printf("请打开client!\n"); printf("以下为使用client端的信息:\n"); //设置服务器地址 ServerAddr.sin_family = AF_INET;//连接方式 ServerAddr.sin_port = htons(uPort);//服务器监听端口 ServerAddr.sin_addr.S_un.S_addr = htonl(INADDR_ANY);//任何客户端都能连接这个服务器 //绑定服务器 if (SOCKET_ERROR == bind(g_ServerSocket, (SOCKADDR*)&ServerAddr, sizeof(ServerAddr))) { printf("bind failed with error code: %d\n", WSAGetLastError()); closesocket(g_ServerSocket); return -1; } //设置监听客户端连接数 if (SOCKET_ERROR == listen(g_ServerSocket, 20000)) { printf("listen failed with error code: %d\n", WSAGetLastError()); closesocket(g_ServerSocket); WSACleanup(); return -1; } _beginthreadex(NULL, 0, ThreadAccept, NULL, 0, 0); for (int k = 0; k < 100; k++) //让主线程休眠,不让它关闭TCP连接. Sleep(10000000); //关闭套接字 for (int j = 0; j < 2; j++) { if (g_Client[j].sClient != INVALID_SOCKET) closesocket(g_Client[j].sClient); } closesocket(g_ServerSocket); WSACleanup(); return 0;}int main(){ StartServer(); //启动服务器 return 0;}
*
说明:
1.比较卡顿;
2.假如client和server两个程序填写的端口不一致,程序的端口会自己获取一个端口;
3.有bug可能导致即使端口一致,程序也会自动获取端口;
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