程序设计分服务器端与客户端,其中,服务器端采用多线程,对于每个客户端连接时,均新建一个服务线程,之后判断客户端发来的信息是不是一个数学算式,是的话就返回计算结果给客户端。
客户端同样采用多线程,主线程是获取用户的输入,将输入发给服务器端。另一个线程则是监听服务器返回的结果,如果有返回就把结果打印到屏幕上。
服务器端
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#include "pch.h"
#include
#include
#include
#include
#pragma comment(lib,"ws2_32.lib")
using namespace std;
const int PORT = 8000;
#define MaxClient 10
#define MaxBufSize 1024
#define _CRT_SECURE_NO_WARINGS
bool MathCalculate(char recvBuff[], char &resBuff);
//服务线程
DWORD WINAPI ServerThread(LPVOID lpParameter) {
SOCKET *ClientSocket = (SOCKET*)lpParameter;
int receByt = 0;
char RecvBuf[MaxBufSize];
char SendBuf[MaxBufSize];
while (1) {
receByt = recv(*ClientSocket, RecvBuf, sizeof(RecvBuf), 0);
//buf[receByt]='\0';
if (receByt > 0) {
cout << "接收到的消息是:" << RecvBuf << " 来自客户端:" << *ClientSocket << endl;
char ResBuf[MaxBufSize];
if (MathCalculate(RecvBuf, *SendBuf)) {
int k = 0;
k = send(*ClientSocket, SendBuf, sizeof(SendBuf), 0);
if (k < 0) {
cout << "发送失败" << endl;
}
memset(SendBuf, 0, sizeof(SendBuf));
}
}
else
{
cout << "客户端:" << *ClientSocket<< "接收消息结束!" << endl;
break;
}
memset(RecvBuf, 0, sizeof(RecvBuf));
}//while
closesocket(*ClientSocket);
free(ClientSocket);
return 0;
}
int main() {
WSAData wsd;
WSAStartup(MAKEWORD(2, 2), &wsd);
SOCKET ListenSocket = socket(AF_INET, SOCK_STREAM, 0);
SOCKADDR_IN ListenAddr;
ListenAddr.sin_family = AF_INET;
ListenAddr.sin_addr.S_un.S_addr = INADDR_ANY;//表示填入本机ip
ListenAddr.sin_port = htons(PORT);
int n;
n = bind(ListenSocket, (LPSOCKADDR)&ListenAddr, sizeof(ListenAddr));
if (n == SOCKET_ERROR) {
cout << "端口绑定失败!" << endl;
return -1;
}
else {
cout << "端口绑定成功:" << PORT << endl;
}
int l = listen(ListenSocket, 20);
cout << "服务端准备就绪,等待连接请求" << endl;
while (1) {
//循环接收客户端连接请求并创建服务线程
SOCKET *ClientSocket = new SOCKET;
ClientSocket = (SOCKET*)malloc(sizeof(SOCKET));
//接收客户端连接请求
int SockAddrlen = sizeof(sockaddr);
*ClientSocket = accept(ListenSocket, 0, 0);
cout << "一个客户端已连接到服务器,socket是:" << *ClientSocket << endl;
CreateThread(NULL, 0, &ServerThread, ClientSocket, 0, NULL);
}//while
closesocket(ListenSocket);
WSACleanup();
return(0);
}//main
char startBuf[5] = { "MATH" };
bool MathCalculate(char recvBuff[],char &resBuff) {
bool getTrue = false;
for (int i = 0; i < 4; i++) {
if (recvBuff[i] == startBuf[i]) {
getTrue = true;
continue;
}
else {
getTrue = false;
break;
}
}
int equalIndex = 0;
int mathflag = 0;
int mathflagIndex = 0;
if (getTrue) {
getTrue = false;
for (int i = 0; i < 50; i++) {
if (recvBuff[i] == '=') {
getTrue = true;
equalIndex = i;
break;
}
}
}
if (getTrue) {
getTrue = false;
for (int i = 0; i < equalIndex; i++) {
switch (recvBuff[i]) {
case '+':
getTrue = true;
mathflag = 1;
mathflagIndex = i;
break;
case '-':
getTrue = true;
mathflag = 2;
mathflagIndex = i;
break;
case '*':
getTrue = true;
mathflag = 3;
mathflagIndex = i;
break;
case '\\':
case '/':
getTrue = true;
mathflag = 4;
mathflagIndex = i;
break;
}
if (getTrue) {
break;
}
}
if (getTrue) {
int a = 0, b = 0;
for (int i = 4; i < mathflagIndex; i++) {
a = a * 10 + recvBuff[i] - '0';
}
for (int i = mathflagIndex + 1; i < equalIndex; i++) {
b = b * 10 + recvBuff[i] - '0';
}
switch (mathflag) {
case 1:
printf("%d+%d=%d\n", a, b, a + b);
sprintf(&resBuff, "Result:%d+%d=%d\n", a, b, a + b);
break;
case 2:
printf("%d-%d=%d\n", a, b, a - b);
sprintf(&resBuff, "Result:%d-%d=%d\n", a, b, a - b);
break;
case 3:
printf("%d*%d=%d\n", a, b, a * b);
sprintf(&resBuff, "Result:%d*%d=%d\n", a, b, a * b);
break;
case 4:
printf("%d//%d=%d\n", a, b, a / b);
sprintf(&resBuff, "Result:%d//%d=%d\n", a, b, a / b);
break;
default :
printf("No Result");
sprintf(&resBuff, "No Result");
break;
}
}
}
return getTrue;
}
客户端
#include "pch.h"
#include
#include
#include
#include
#pragma comment(lib,"ws2_32.lib")
using namespace std;
const int PORT = 8000;
#define MaxBufSize 1024
#define _CRT_SECURE_NO_WARINGS
//监听来自服务器的消息
DWORD WINAPI recvFromServer(LPVOID lpParameter)
{
char buf[MaxBufSize];
SOCKET *ClientSocket = (SOCKET*)lpParameter;
while (1) {
memset(buf, '\0', sizeof(buf));
if (recv(*ClientSocket, buf, 1024, 0) <= 0)
{
printf("关闭连接!\n");
break;
closesocket(*ClientSocket);
}
std::cout << buf << "\n";
}
return 0;
}
int main() {
WSADATA wsd;
WSAStartup(MAKEWORD(2, 2), &wsd);
SOCKET SocketClient = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
SOCKADDR_IN ClientAddr;
ClientAddr.sin_family = AF_INET;
ClientAddr.sin_addr.S_un.S_addr = inet_addr("127.0.0.1");
ClientAddr.sin_port = htons(PORT);
int n = 0;
n = connect(SocketClient, (struct sockaddr*)&ClientAddr, sizeof(ClientAddr));
if (n == SOCKET_ERROR) {
cout << "连接失败" << endl;
return -1;
}
cout << "已经连接到服务器,可以向服务器发送消息了!" << endl;
CreateThread(NULL, 0, &recvFromServer, &SocketClient, 0, NULL);
char info[1024], SendBuff[MaxBufSize], RecvBuff[MaxBufSize];
while (1) {
cout << "请输入要发送的信息,按回车结束发送:" << endl;
cin>>info;
if (info[0] == '\0')
break;
sprintf(SendBuff, "MATH");
strcat(SendBuff, info);
memset(info, 0, sizeof(info));
int k = 0;
n = send(SocketClient, SendBuff, sizeof(SendBuff), 0);
memset(SendBuff, 0, sizeof(SendBuff));
if (k < 0) {
cout << "发送失败" << endl;
}
Sleep(500);
memset(RecvBuff, 0, sizeof(RecvBuff));
}
closesocket(SocketClient);
WSACleanup();
return 0;
}
说明:三个框中,左边的是服务器,中间的和右边的是两个客户端。