C++多线程实现TCP服务器端同时和多个客户端通信

Lala ·

更新时间:2024-11-10

· 1838 次阅读

通讯建立后首先由服务器端发送消息，客户端接收消息；接着客户端发送消息，服务器端接收消息，实现交互发送消息。

服务器同时可以和多个客户端建立连接，进行交互；

在某次交互中，服务器端或某客户端有一方发送"end"即终止服务器与其的通信；服务器还可以继续接收其他客户端的请求，与其他客户端通信。

服务器端


#include <WinSock2.h>
#include <WS2tcpip.h>
#include <iostream>
using namespace std;
#pragma comment(lib, "ws2_32.lib")
#define PORT 65432
DWORD WINAPI ThreadFun(LPVOID lpThreadParameter);
int main() 
{
//初始化winsock2.DLL
WSADATA wsaData;
WORD wVersionRequested = MAKEWORD(2, 2);
if (WSAStartup(wVersionRequested, &wsaData) != 0)
{
cout << "加载winsock.dll失败！" << endl;
return 0;
}
//创建套接字
SOCKET  sock_server;
if ((sock_server = socket(AF_INET, SOCK_STREAM, 0)) == SOCKET_ERROR)
{
cout << "创建套接字失败！错误代码：" << WSAGetLastError() << endl;
WSACleanup();
return 0;
}
//绑定端口和Ip
sockaddr_in addr;
addr.sin_family = AF_INET;
addr.sin_port = htons(PORT);
inet_pton(AF_INET, "127.0.0.1", &addr.sin_addr);//绑定本机的环回地址
if (SOCKET_ERROR == bind(sock_server, (SOCKADDR*)&addr, sizeof(sockaddr_in)))
{
cout << "地址绑定失败！错误代码：" << WSAGetLastError() << endl;
closesocket(sock_server);
WSACleanup();
return 0;
}
//将套接字设为监听状态
listen(sock_server, 0);
//主线程循环接收客户端的连接
while (1) 
{
sockaddr_in addrClient;
int len = sizeof(sockaddr_in);
//接收成功返回与client通讯的socket
SOCKET con = accept(sock_server, (SOCKADDR*)&addrClient, &len);
if (con != INVALID_SOCKET) 
{
//创建线程 并且传入与client通讯的套接字
HANDLE hThread = CreateThread(NULL, 0, ThreadFun, (LPVOID)con, 0, NULL);
CloseHandle(hThread); //关闭对线程的引用
}
}
closesocket(sock_server);
WSACleanup();
return 0;
}
//线程通讯部分
DWORD WINAPI ThreadFun(LPVOID lpThreadParameter) 
{
//与客户端通讯 先发送再接收数据
SOCKET sock = (SOCKET)lpThreadParameter;
cout << "成功和" << sock << "建立连接！" << endl;
while (1)
{
char msgbuffer[1000];//字符缓冲区
printf("服务器向%d发送数据：\n", sock);
cin.getline(msgbuffer, sizeof(msgbuffer));
int size = send(sock, msgbuffer, sizeof(msgbuffer), 0);//给客户端发送一段信息
if (strcmp(msgbuffer, "end\0") == 0)
{
cout << "关闭和" << sock << "的连接！" << endl;
return 0;
}
if (size == SOCKET_ERROR || size == 0)
{
cout << "发送信息失败！错误代码：" << WSAGetLastError() << endl;
return 0;
}
else cout << "信息发送成功！" << endl;
//接收客户端数据
msgbuffer[999] = { 0 };
int ret = recv(sock, msgbuffer, sizeof(msgbuffer), 0);
if(ret == SOCKET_ERROR || ret == 0)
{
cout << sock << "断开了连接！" << endl;
break;
}
else cout << sock << "  说: " << msgbuffer << endl;
}
return 0;
}

客户端


#include <winsock2.h>
#include <WS2tcpip.h>
#include <iostream>
using  namespace std;
#pragma comment(lib, "ws2_32.lib")
#define PORT 65432
int  main() 
{
//初始化winsock2.DLL
WSADATA wsaData;
WORD wVersionRequested = MAKEWORD(2, 2);
if (WSAStartup(wVersionRequested, &wsaData) != 0)
{
cout << "加载winsock.dll失败！" << endl;
return 0;
}
//创建套接字
SOCKET  sock_client; 
if ((sock_client = socket(AF_INET, SOCK_STREAM, 0)) == SOCKET_ERROR)
{
cout << "创建套接字失败！错误代码：" << WSAGetLastError() << endl;
WSACleanup();
return 0;
}
//连接服务器
sockaddr_in   addr;
addr.sin_family = AF_INET;
addr.sin_port = htons(PORT);
inet_pton(AF_INET, "127.0.0.1", &addr.sin_addr);//绑定本机的环回地址
int len = sizeof(sockaddr_in);
if (connect(sock_client, (SOCKADDR*)&addr, len) == SOCKET_ERROR) {
cout << "连接失败！错误代码：" << WSAGetLastError() << endl;
return 0;
}
//实现交互部分，客户端先接收后发送数据
while (1)
{
//接收服务端的消息
char msgbuffer[1000] = { 0 };
int size = recv(sock_client, msgbuffer, sizeof(msgbuffer), 0);
if (strcmp(msgbuffer, "end\0") == 0)
{
cout << "服务器端已经关闭连接！" << endl;
break;
}
if (size < 0)
{
cout << "接收信息失败！错误代码：" << WSAGetLastError() << endl;
break;
}
else if (size == 0)
{
cout << "对方已经关闭连接" << endl;
break;
}
else cout << "The message from Server:" << msgbuffer << endl;
//从键盘输入一行文字发送给服务器
msgbuffer[999] =  0 ;
cout << "从键盘输入发给服务器的信息：" << endl;
cin.getline(msgbuffer, sizeof(msgbuffer));
if (strcmp(msgbuffer, "end\0") == 0)
{
cout << "关闭连接！" << endl;
break;
}
int ret = send(sock_client, msgbuffer, sizeof(msgbuffer), 0);
if (ret == SOCKET_ERROR || ret == 0)
{
cout << "发送信息失败！错误代码：" << WSAGetLastError() << endl;
break;
}
else cout << "信息发送成功！" << endl;
}
closesocket(sock_client);
WSACleanup();
return 0;
}