C语言智能家居控制中心：优化家居环境，提升舒适体验

#include <stdio.h> #include <stdlib.h> #include <string.h> #include <sqlite3.h> #include <sys/socket.h> #include <arpa/inet.h> #include <unistd.h> #include <pthread.h> #include <json-c/json.h>

#define MAX_CLIENTS 10 #define DATABASE 'smart_home.db'

typedef struct { int client_socket; sqlite3 *db; } client_data;

void *handle_client(void *arg) { client_data *data = (client_data *)arg; int client_socket = data->client_socket; sqlite3 *db = data->db; char buffer[1024]; memset(buffer, 0, sizeof(buffer));

// Read client request
ssize_t bytes_read = read(client_socket, buffer, sizeof(buffer));
if (bytes_read <= 0) {
    perror('Error reading client request');
    close(client_socket);
    free(data);
    return NULL;
}

// Parse JSON request
struct json_object *json_request = json_tokener_parse(buffer);
if (json_request == NULL) {
    fprintf(stderr, 'Error parsing JSON request: %s\n', buffer);
    close(client_socket);
    free(data);
    return NULL;
}

// Get user ID from JSON request
struct json_object *json_userid;
json_object_object_get_ex(json_request, 'userid', &json_userid);
int userid = json_object_get_int(json_userid);

// Query database for device status
char query[256];
sprintf(query, 'SELECT device_name, value FROM Status WHERE uid = %d', userid);
sqlite3_stmt *stmt;
if (sqlite3_prepare_v2(db, query, -1, &stmt, NULL) != SQLITE_OK) {
    fprintf(stderr, 'Error preparing database query: %s\n', sqlite3_errmsg(db));
    close(client_socket);
    free(data);
    return NULL;
}

// Process query results
char response[1024];
memset(response, 0, sizeof(response));
while (sqlite3_step(stmt) == SQLITE_ROW) {
    const char *device_name = (const char *)sqlite3_column_text(stmt, 0);
    const char *value = (const char *)sqlite3_column_text(stmt, 1);

    // Analyze device status and generate suggestion
    if (strcmp(device_name, 'air_conditioner') == 0) {
        int temperature = atoi(value);
        if (temperature < 24) {
            strcat(response, 'Air conditioner temperature is too low. Please increase it to 26°C.\n');
        }
    } else if (strcmp(device_name, 'humidifier') == 0) {
        int humidity = atoi(value);
        if (humidity < 40 || humidity > 70) {
            strcat(response, 'Humidifier humidity is too high or too low. Please adjust the humidity.\n');
        }
    }
}

// Send response to client
if (strlen(response) > 0) {
    write(client_socket, response, strlen(response));
} else {
    write(client_socket, 'No suggestion.', 14);
}

// Clean up
sqlite3_finalize(stmt);
close(client_socket);
free(data);
return NULL;

}

int main() { // Initialize SQLite database sqlite3 *db; if (sqlite3_open(DATABASE, &db) != SQLITE_OK) { fprintf(stderr, 'Error opening database: %s\n', sqlite3_errmsg(db)); return 1; }

// Create socket
int server_socket = socket(AF_INET, SOCK_STREAM, 0);
if (server_socket == -1) {
    perror('Error creating socket');
    return 1;
}

// Bind socket to IP and port
struct sockaddr_in server_address;
server_address.sin_family = AF_INET;
server_address.sin_port = htons(8080);
server_address.sin_addr.s_addr = INADDR_ANY;
if (bind(server_socket, (struct sockaddr *)&server_address, sizeof(server_address)) == -1) {
    perror('Error binding socket');
    return 1;
}

// Listen for incoming connections
if (listen(server_socket, MAX_CLIENTS) == -1) {
    perror('Error listening for connections');
    return 1;
}

printf('Server listening on port 8080...\n');

while (1) {
    // Accept incoming connection
    struct sockaddr_in client_address;
    socklen_t client_address_length = sizeof(client_address);
    int client_socket = accept(server_socket, (struct sockaddr *)&client_address, &client_address_length);
    if (client_socket == -1) {
        perror('Error accepting connection');
        continue;
    }

    // Create thread to handle client
    client_data *data = malloc(sizeof(client_data));
    data->client_socket = client_socket;
    data->db = db;
    pthread_t thread;
    if (pthread_create(&thread, NULL, handle_client, data) != 0) {
        perror('Error creating thread');
        close(client_socket);
        free(data);
    }
}

// Close SQLite database
sqlite3_close(db);

// Close server socket
close(server_socket);

return 0;

}