智能家居设备状态监测与建议生成服务器

以下是一个示例的服务器代码，用于接收来自客户端的请求、解析JSON数据、查询数据库并给出建议：

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sqlite3.h>
#include <sys/socket.h>
#include <arpa/inet.h>

#define MAX_BUFFER_SIZE 1024

void handleClientRequest(int clientSocket);
void parseJsonAndQueryDatabase(const char* json, char* response);
int getDeviceStatus(sqlite3* db, int uid, const char* deviceName, char* deviceState, char* value);
void generateSuggestion(const char* deviceName, const char* deviceState, const char* value, char* suggestion);

int main()
{
    int serverSocket, clientSocket;
    struct sockaddr_in serverAddress, clientAddress;
    socklen_t clientAddressLength;

    // 创建套接字
    serverSocket = socket(AF_INET, SOCK_STREAM, 0);
    if (serverSocket == -1) {
        perror("Failed to create socket");
        exit(EXIT_FAILURE);
    }

    // 设置服务器地址和端口
    serverAddress.sin_family = AF_INET;
    serverAddress.sin_addr.s_addr = htonl(INADDR_ANY);
    serverAddress.sin_port = htons(12345);

    // 绑定套接字到服务器地址和端口
    if (bind(serverSocket, (struct sockaddr*)&serverAddress, sizeof(serverAddress)) == -1) {
        perror("Failed to bind socket");
        exit(EXIT_FAILURE);
    }

    // 监听连接请求
    if (listen(serverSocket, 5) == -1) {
        perror("Failed to listen for connections");
        exit(EXIT_FAILURE);
    }

    printf("Server started. Listening for connections...
");

    while (1) {
        // 接受客户端连接
        clientAddressLength = sizeof(clientAddress);
        clientSocket = accept(serverSocket, (struct sockaddr*)&clientAddress, &clientAddressLength);
        if (clientSocket == -1) {
            perror("Failed to accept client connection");
            continue;
        }

        printf("Client connected. Handling request...
");

        // 处理客户端请求
        handleClientRequest(clientSocket);

        // 关闭客户端套接字
        close(clientSocket);
    }

    // 关闭服务器套接字
    close(serverSocket);

    return 0;
}

void handleClientRequest(int clientSocket)
{
    char buffer[MAX_BUFFER_SIZE];
    ssize_t bytesRead;
    char response[MAX_BUFFER_SIZE];

    // 读取客户端请求数据
    bytesRead = read(clientSocket, buffer, sizeof(buffer));
    if (bytesRead == -1) {
        perror("Failed to read client request");
        return;
    }

    // 解析JSON数据并查询数据库
    parseJsonAndQueryDatabase(buffer, response);

    // 发送响应数据给客户端
    ssize_t bytesWritten = write(clientSocket, response, strlen(response));
    if (bytesWritten == -1) {
        perror("Failed to send response to client");
        return;
    }
}

void parseJsonAndQueryDatabase(const char* json, char* response)
{
    // 解析JSON数据获取userid
    int userid;
    // ...

    // 连接到数据库
    sqlite3* db;
    if (sqlite3_open("database.db", &db) != SQLITE_OK) {
        sprintf(response, "Failed to connect to database");
        return;
    }

    // 查询数据库获取设备状态信息
    char deviceName[MAX_BUFFER_SIZE];
    char deviceState[MAX_BUFFER_SIZE];
    char value[MAX_BUFFER_SIZE];
    int status = getDeviceStatus(db, userid, deviceName, deviceState, value);
    if (status != SQLITE_OK) {
        sprintf(response, "Failed to query database");
        sqlite3_close(db);
        return;
    }

    // 生成建议
    char suggestion[MAX_BUFFER_SIZE];
    generateSuggestion(deviceName, deviceState, value, suggestion);

    // 关闭数据库连接
    sqlite3_close(db);

    // 构建响应数据
    sprintf(response, "Suggestion: %s", suggestion);
}

int getDeviceStatus(sqlite3* db, int uid, const char* deviceName, char* deviceState, char* value)
{
    char query[MAX_BUFFER_SIZE];
    sprintf(query, "SELECT device_name, device_state, value FROM Status WHERE uid = %d", uid);

    sqlite3_stmt* stmt;
    int status = sqlite3_prepare_v2(db, query, -1, &stmt, NULL);
    if (status != SQLITE_OK) {
        return status;
    }

    status = sqlite3_step(stmt);
    if (status == SQLITE_ROW) {
        strcpy(deviceName, sqlite3_column_text(stmt, 0));
        strcpy(deviceState, sqlite3_column_text(stmt, 1));
        strcpy(value, sqlite3_column_text(stmt, 2));
    }

    sqlite3_finalize(stmt);

    return SQLITE_OK;
}

void generateSuggestion(const char* deviceName, const char* deviceState, const char* value, char* suggestion)
{
    // 根据设备状态和值生成建议
    // ...

    sprintf(suggestion, "Device: %s, State: %s, Value: %s", deviceName, deviceState, value);
}

请注意，此示例代码仅用于演示目的，实际使用时可能需要进行错误处理、安全性验证等。

此服务器代码将等待客户端连接，接受客户端请求，解析JSON数据，查询数据库并生成建议，然后将建议作为响应发送回客户端。您可以根据需要修改代码以满足您的具体要求。