网络编程实现远程算数运算（客户端与服务器）

// Client.cpp : Defines the entry point for the console application. // #include "stdafx.h" #include <string.h> #include <assert.h> #include <iostream> #include <winsock2.h> #include <process.h> #pragma comment(lib, "WS2_32.lib") using namespace std; #define CLIENT_SETUP_FAIL 1 //启动客户端失败 #define CLIENT_CREATETHREAD_FAIL 2 //创建线程失败 #define CLIENT_CONNECT_FAIL 3 //网络连接断开 #define TIMEFOR_THREAD_EXIT 1000 //子线程退出时间 #define TIMEFOR_THREAD_SLEEP 500 //线程睡眠时间 #define SERVERIP "127.0.0.1" //服务器IP #define SERVERPORT 5556 //服务器TCP端口 #define MAX_NUM_BUF 48 //缓冲区的最大长度 #define ADD '+' //+ #define SUB '-' //- #define MUT '*' //* #define DIV '/' /// #define EQU '=' //= //数据包类型 #define EXPRESSION 'E' //算数表达式 #define BYEBYE 'B' //消息byebye #define HEADERLEN (sizeof(hdr)) //头长度 //数据包头结构该结构在win32xp下为4byte typedef struct _head { char type;//类型 unsigned short len;//数据包的长度(包括头的长度) }hdr, *phdr; //数据包中的数据结构 typedef struct _data { char buf[MAX_NUM_BUF]; }DATABUF, *pDataBuf; SOCKET sClient; //套接字 HANDLE hThreadSend; //发送数据线程 HANDLE hThreadRecv; //接收数据线程 DATABUF bufSend; //发送数据缓冲区 DATABUF bufRecv; //接收数据缓冲区 CRITICAL_SECTION csSend; //临界区对象，锁定bufSend CRITICAL_SECTION csRecv; //临界区对象，锁定bufRecv BOOL bSendData; //通知发送数据线程 HANDLE hEventShowDataResult; //显示计算结果的事件 BOOL bConnecting; //与服务器的连接状态 HANDLE arrThread[2]; //子线程数组 BOOL InitClient(void); //初始化 BOOL ConnectServer(void); //连接服务器 BOOL CreateSendAndRecvThread(void); //创建发送和接收数据线程 void InputAndOutput(void); //用户输入数据 void ExitClient(void); //退出 void InitMember(void); //初始化全局变量 BOOL InitSockt(void); //创建SOCKET DWORD __stdcall RecvDataThread(void* pParam); //接收数据线程 DWORD __stdcall SendDataThread(void* pParam); //发送数据线程 BOOL PackByebye(const char* pExpr); //将输入的"Byebye" "byebye"的字符串打包 BOOL PackExpression(const char *pExpr); //将输入的算数表达式打包 void ShowConnectMsg(BOOL bSuc); //显示连接服务器消息 void ShowDataResultMsg(void); //显示连计算结果 void ShowTipMsg(BOOL bFirstInput); //显示提示信息 int main(int argc, char* argv[]) { //初始化 if (!InitClient()) { ExitClient(); return CLIENT_SETUP_FAIL; } //连接服务器 if (ConnectServer()) { ShowConnectMsg(TRUE); }else{ ShowConnectMsg(FALSE); ExitClient(); return CLIENT_SETUP_FAIL; } //创建发送和接收数据线程 if (!CreateSendAndRecvThread()) { ExitClient(); return CLIENT_CREATETHREAD_FAIL; } //用户输入数据和显示结果 InputAndOutput(); //退出 ExitClient(); return 0; } /** * 初始化 */ BOOL InitClient(void) { //初始化全局变量 InitMember(); //创建SOCKET if (!InitSockt()) { return FALSE; } return TRUE; } /** * 初始化全局变量 */ void InitMember(void) { //初始化临界区 InitializeCriticalSection(&csSend); InitializeCriticalSection(&csRecv); sClient = INVALID_SOCKET; //套接字 hThreadRecv = NULL; //接收数据线程句柄 hThreadSend = NULL; //发送数据线程句柄 bConnecting = FALSE; //为连接状态 bSendData = FALSE; //不发送数据状态 //初始化数据缓冲区 memset(bufSend.buf, 0, MAX_NUM_BUF); memset(bufRecv.buf, 0, MAX_NUM_BUF); memset(arrThread, 0, 2); //手动设置事件，初始化为无信号状态 hEventShowDataResult = (HANDLE)CreateEvent(NULL, TRUE, FALSE, NULL); } /** * 创建非阻塞套接字 */ BOOL InitSockt(void) { int reVal; //返回值 WSADATA wsData; //WSADATA变量 reVal = WSAStartup(MAKEWORD(2,2),&wsData);//初始化Windows Sockets Dll //创建套接字 sClient = socket(AF_INET, SOCK_STREAM, 0); if(INVALID_SOCKET == sClient) return FALSE; //设置套接字非阻塞模式 unsigned long ul = 1; reVal = ioctlsocket(sClient, FIONBIO, (unsigned long*)&ul); if (reVal == SOCKET_ERROR) return FALSE; return TRUE; } /** * 客户端退出 */ void ExitClient(void) { DeleteCriticalSection(&csSend); DeleteCriticalSection(&csRecv); CloseHandle(hThreadRecv); CloseHandle(hThreadSend); closesocket(sClient); WSACleanup(); return; } /** * 连接服务器 */ BOOL ConnectServer(void) { int reVal; //返回值 sockaddr_in serAddr;//服务器地址 serAddr.sin_family = AF_INET; serAddr.sin_port = htons(SERVERPORT); serAddr.sin_addr.S_un.S_addr = inet_addr(SERVERIP); for (;;) { //连接服务器 reVal = connect(sClient, (struct sockaddr*)&serAddr, sizeof(serAddr)); //处理连接错误 if(SOCKET_ERROR == reVal) { int nErrCode = WSAGetLastError(); if( WSAEWOULDBLOCK == nErrCode ||//连接还没有完成 WSAEINVAL == nErrCode) { continue; }else if (WSAEISCONN == nErrCode)//连接已经完成 { break; }else//其它原因，连接失败 { return FALSE; } } if ( reVal == 0 )//连接成功 break; } bConnecting = TRUE; return TRUE; } /** * 显示连接服务器失败信息 */ void ShowConnectMsg(BOOL bSuc) { if (bSuc) { cout << "******************************" << endl; cout << "* *" << endl; cout << "* Succeed to connect server! *" << endl; cout << "* *" << endl; cout << "******************************" << endl; }else{ cout << "***************************" << endl; cout << "* *" << endl; cout << "* Fail to connect server! *" << endl; cout << "* *" << endl; cout << "***************************" << endl; } return; } /** * 表达式结果 */ void ShowDataResultMsg(void) { EnterCriticalSection(&csRecv); cout << "**********************************" << endl; cout << "* *" << endl; cout << "* Result: *" << endl; cout << bufRecv.buf <<endl; cout << "* *" << endl; cout << "**********************************" << endl; LeaveCriticalSection(&csRecv); } /** * 提示信息 */ void ShowTipMsg(BOOL bFirstInput) { if (bFirstInput)//首次显示 { cout << "**********************************" << endl; cout << "* *" << endl; cout << "* Please input expression. *" << endl; cout << "* Usage:NumberOperatorNumber= *" << endl; cout << "* *" << endl; cout << "**********************************" << endl; }else{ cout << "**********************************" << endl; cout << "* *" << endl; cout << "* Please input: expression *" << endl; cout << "* Usage:NumberOperatorNumber= *" << endl; cout << "* *" << endl; cout << "* If you want to exit. *" << endl; cout << "* Usage: Byebye or byebye *" << endl; cout << "* *" << endl; cout << "**********************************" << endl; } } /** * 创建发送和接收数据线程 */ BOOL CreateSendAndRecvThread(void) { //创建接收数据的线程 unsigned long ulThreadId; hThreadRecv = CreateThread(NULL, 0, RecvDataThread, NULL, 0, &ulThreadId); if (NULL == hThreadRecv) return FALSE; //创建发送数据的线程 hThreadSend = CreateThread(NULL, 0, SendDataThread, NULL, 0, &ulThreadId); if (NULL == hThreadSend) return FALSE; //添加到线程数组 arrThread[0] = hThreadRecv; arrThread[1] = hThreadSend; return TRUE; } /** * 输入数据和显示结果 */ void InputAndOutput(void) { char cInput[MAX_NUM_BUF]; //用户输入缓冲区 BOOL bFirstInput = TRUE; //第一次只能输入算数表达式 for (;bConnecting;) //连接状态 { memset(cInput, 0, M