写出一个c++代码的简单聊天室

由于一个完整的聊天室涉及到较多的代码实现，我在这里提供一个简单的 C++ Socket 编程实现的聊天室示例代码，供您参考。

服务端代码：

#include <iostream>
#include <string>
#include <vector>
#include <WinSock2.h>

#pragma comment(lib, "ws2_32.lib")

using namespace std;

const int PORT = 8080;
const int MAX_CLIENTS = 10;
const int BUFFER_SIZE = 1024;

vector<SOCKET> clients;

void broadcast(const char* message, SOCKET sender)
{
    for (SOCKET client : clients) {
        if (client != sender) {
            send(client, message, strlen(message), 0);
        }
    }
}

int main()
{
    WSADATA wsaData;
    int iResult = WSAStartup(MAKEWORD(2, 2), &wsaData);
    if (iResult != 0) {
        cout << "WSAStartup failed with error: " << iResult << endl;
        return 1;
    }

    SOCKET listenSocket = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
    if (listenSocket == INVALID_SOCKET) {
        cout << "socket failed with error: " << WSAGetLastError() << endl;
        WSACleanup();
        return 1;
    }

    sockaddr_in serverAddress;
    serverAddress.sin_family = AF_INET;
    serverAddress.sin_addr.s_addr = INADDR_ANY;
    serverAddress.sin_port = htons(PORT);

    iResult = bind(listenSocket, (sockaddr*)&serverAddress, sizeof(serverAddress));
    if (iResult == SOCKET_ERROR) {
        cout << "bind failed with error: " << WSAGetLastError() << endl;
        closesocket(listenSocket);
        WSACleanup();
        return 1;
    }

    iResult = listen(listenSocket, SOMAXCONN);
    if (iResult == SOCKET_ERROR) {
        cout << "listen failed with error: " << WSAGetLastError() << endl;
        closesocket(listenSocket);
        WSACleanup();
        return 1;
    }

    cout << "Server started, listening on port " << PORT << endl;

    while (true) {
        SOCKET clientSocket = accept(listenSocket, NULL, NULL);
        if (clientSocket == INVALID_SOCKET) {
            cout << "accept failed with error: " << WSAGetLastError() << endl;
            closesocket(listenSocket);
            WSACleanup();
            return 1;
        }

        clients.push_back(clientSocket);
        cout << "New client connected, total " << clients.size() << " clients" << endl;

        char welcomeMessage[BUFFER_SIZE] = "Welcome to the chat room!\r\n";
        send(clientSocket, welcomeMessage, strlen(welcomeMessage), 0);

        while (true) {
            char buffer[BUFFER_SIZE] = "";
            iResult = recv(clientSocket, buffer, BUFFER_SIZE, 0);
            if (iResult == SOCKET_ERROR) {
                cout << "recv failed with error: " << WSAGetLastError() << endl;
                closesocket(clientSocket);
                clients.erase(find(clients.begin(), clients.end(), clientSocket));
                break;
            }
            else if (iResult == 0) {
                closesocket(clientSocket);
                clients.erase(find(clients.begin(), clients.end(), clientSocket));
                cout << "Client disconnected, total " << clients.size() << " clients" << endl;
                break;
            }
            else {
                buffer[iResult] = '\0';
                cout << "Received message from client: " << buffer << endl;
                broadcast(buffer, clientSocket);
            }
        }
    }

    closesocket(listenSocket);
    WSACleanup();

    return 0;
}

客户端代码：

#include <iostream>
#include <string>
#include <WinSock2.h>

#pragma comment(lib, "ws2_32.lib")

using namespace std;

const int PORT = 8080;
const int BUFFER_SIZE = 1024;

int main()
{
    WSADATA wsaData;
    int iResult = WSAStartup(MAKEWORD(2, 2), &wsaData);
    if (iResult != 0) {
        cout << "WSAStartup failed with error: " << iResult << endl;
        return 1;
    }

    SOCKET clientSocket = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
    if (clientSocket == INVALID_SOCKET) {
        cout << "socket failed with error: " << WSAGetLastError() << endl;
        WSACleanup();
        return 1;
    }

    sockaddr_in serverAddress;
    serverAddress.sin_family = AF_INET;
    serverAddress.sin_addr.s_addr = inet_addr("127.0.0.1");
    serverAddress.sin_port = htons(PORT);

    iResult = connect(clientSocket, (sockaddr*)&serverAddress, sizeof(serverAddress));
    if (iResult == SOCKET_ERROR) {
        cout << "connect failed with error: " << WSAGetLastError() << endl;
        closesocket(clientSocket);
        WSACleanup();
        return 1;
    }

    char buffer[BUFFER_SIZE] = "";
    iResult = recv(clientSocket, buffer, BUFFER_SIZE, 0);
    if (iResult == SOCKET_ERROR) {
        cout << "recv failed with error: " << WSAGetLastError() << endl;
        closesocket(clientSocket);
        WSACleanup();
        return 1;
    }
    else {
        cout << buffer << endl;
    }

    while (true) {
        cout << "Enter your message: ";
        string message;
        getline(cin, message);

        iResult = send(clientSocket, message.c_str(), message.length(), 0);
        if (iResult == SOCKET_ERROR) {
            cout << "send failed with error: " << WSAGetLastError() << endl;
            closesocket(clientSocket);
            WSACleanup();
            return 1;
        }
    }

    closesocket(clientSocket);
    WSACleanup();

    return 0;
}

这段代码实现了一个简单的聊天室，服务端可以接受多个客户端连接，并将客户端发送的消息广播给其他客户端。客户端可以连接到服务端，并发送消息到服务端。需要注意的是，这段代码没有实现用户界面和消息协议，只是一个简单的 Socket 编程示例。