• 日期: 2026-03-22 13:28:47
  • 标签: 常规

#include <stdio.h> #include <stdlib.h> #include <stdbool.h> #include <unistd.h> #include <sys/socket.h> #include <netinet/in.h> #include <arpa/inet.h> #include "server.h"

#define PORT 8989

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

// 创建套接字
serverSocket = socket(AF_INET, SOCK_STREAM, 0);
if (serverSocket < 0) {
    perror("创建套接字出错");
    exit(1);
}

// 设置服务器地址
serverAddress.sin_family = AF_INET;
serverAddress.sin_addr.s_addr = INADDR_ANY;
serverAddress.sin_port = htons(PORT);

// 将套接字绑定到指定的地址和端口
if (bind(serverSocket, (struct sockaddr*)&serverAddress, sizeof(serverAddress)) < 0) {
    perror("绑定套接字出错");
    exit(1);
}

// 监听传入连接
if (listen(serverSocket, 5) < 0) {
    perror("监听连接出错");
    exit(1);
}

printf("服务器已启动。正在监听端口 %d...

", PORT);

while (true) {
    // 接受客户端连接
    clientSocket = accept(serverSocket, (struct sockaddr*)&clientAddress, &clientAddressLength);
    if (clientSocket < 0) {
        perror("接受连接出错");
        exit(1);
    }

    printf("客户端已连接，来自 %s:%d

", inet_ntoa(clientAddress.sin_addr), ntohs(clientAddress.sin_port));

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

    // 关闭客户端连接
    close(clientSocket);
    printf("客户端已断开连接

"); }

// 关闭服务器套接字
close(serverSocket);

return 0;

}

// server.h

#ifndef SERVER_H #define SERVER_H

#include <json-c/json.h>

void handleClientRequest(int clientSocket); // 处理客户端请求 void handleTemperatureHumidity(int clientSocket, int uid); // 处理温度湿度请求 void sendResponse(int clientSocket, const char* response); // 发送响应 char* getAdvice(int temperature, int humidity); // 获取建议

#endif

#include <stdio.h> #include <stdlib.h> #include <string.h> #include <sqlite3.h> #include <stdbool.h> #include <unistd.h> #include <sys/socket.h> #include <netinet/in.h> #include <arpa/inet.h> #include <json-c/json.h> #include <errno.h> #include "server.h"

#define DATABASE "database.db"

struct Status { int sid; // 状态ID int uid; // 用户ID char device_name[10]; // 设备名称 char device_state[10]; // 设备状态 char value[10]; // 值 char mode[10]; // 模式 };

void handleClientRequest(int clientSocket) { char buffer[1024]; int bytesRead = read(clientSocket, buffer, sizeof(buffer)); if (bytesRead < 0) { perror("从套接字读取数据出错"); exit(1); }

// 解析JSON请求
struct json_object* jsonRequest = json_tokener_parse(buffer);
if (jsonRequest == NULL) {
    perror("Failed to allocate memory");
    exit(1);
}

// 从JSON请求中获取用户ID
struct json_object* jsonUserID;
json_object_object_get_ex(jsonRequest, 'userid', &jsonUserID);
int uid = json_object_get_int(jsonUserID);

// 处理温度湿度请求
handleTemperatureHumidity(clientSocket, uid);

// 清理资源
json_object_put(jsonRequest);

}

void handleTemperatureHumidity(int clientSocket, int uid) { sqlite3* db; int rc = sqlite3_open(DATABASE, &db); if (rc != SQLITE_OK) { perror("打开数据库出错"); exit(1); }

char query[100];
snprintf(query, sizeof(query), "SELECT * FROM Status WHERE uid = %d", uid);

sqlite3_stmt* stmt;
rc = sqlite3_prepare_v2(db, query, -1, &stmt, 0);
if (rc != SQLITE_OK) {
    perror("准备SQL语句出错");
    exit(1);
}

// 获取用户的最新温度和湿度值
int temperature = 0;
int humidity = 0;

while (sqlite3_step(stmt) == SQLITE_ROW) {
    struct Status status;
    status.sid = sqlite3_column_int(stmt, 0);
    status.uid = sqlite3_column_int(stmt, 1);
    strcpy(status.device_name, (char*)sqlite3_column_text(stmt, 2));
    strcpy(status.device_state, (char*)sqlite3_column_text(stmt, 3));
    strcpy(status.value, (char*)sqlite3_column_text(stmt, 4));
    strcpy(status.mode, (char*)sqlite3_column_text(stmt, 5));

    if (strcmp(status.device_name, "空调") == 0) {
        temperature = atoi(status.value);
    } else if (strcmp(status.device_name, "加湿器") == 0) {
        humidity = atoi(status.value);
    }
}

// 根据温度和湿度值获取建议
char* advice = getAdvice(temperature, humidity);

// 将建议发送给客户端
sendResponse(clientSocket, advice);

// 清理资源
sqlite3_finalize(stmt);
sqlite3_close(db);

}

void sendResponse(int clientSocket, const char* response) { int bytesWritten = write(clientSocket, response, strlen(response)); if (bytesWritten < 0) { perror("写入套接字出错"); exit(1); } }

char* getAdvice(int temperature, int humidity) { char* advice = (char*)malloc(100);

if (temperature < 24) {
    snprintf(advice, 100, "温度过低，请将温度调高至 26°C。");
} else if (humidity < 40 || humidity > 70) {
    snprintf(advice, 100, "湿度过高或过低，请调整湿度水平。");
} else {
    snprintf(advice, 100, "暂无建议。");
}

return advice;

}

// 客户端 #ifndef PROCESSION_H #define PROCESSION_H

#include #include #include

namespace Ui { class Procession; }

class Procession : public QWidget { Q_OBJECT

public: explicit Procession(int userid,QWidget *parent = nullptr); ~Procession(); void processionWidget();

private slots: void connectToServer();//和服务器通信 void handleServerResponse(QNetworkReply *reply);//和服务器连接回应

private: Ui::Procession *ui; int userid; QNetworkAccessManager *networkManager; };

#endif // PROCESSION_H

#include "procession.h" #include "ui_procession.h" #include #include #include #include

//通过发送POST请求将用户ID发送到指定的服务器，并将服务器的响应显示在界面上。

Procession::Procession(int userid,QWidget *parent) : QWidget(parent), ui(new Ui::Procession), userid(userid) { ui->setupUi(this); processionWidget(); networkManager = new QNetworkAccessManager(this); // 初始化 networkManager 对象 connect(ui->connectServerBtn,&QPushButton::clicked,this,={ ui->message->setText("正在连接中……"); this->connectToServer(); }); connect(networkManager, &QNetworkAccessManager::finished, this, &Procession::handleServerResponse);

}

Procession::~Procession() { delete ui; }

void Procession::processionWidget() { setWindowTitle("服务器通信"); setAutoFillBackground(true); QPalette palette=this->palette(); QPixmap pixmap(":/user/image/image/net.jpg"); palette.setBrush(QPalette::Window, QBrush(pixmap)); setPalette(palette); setFixedSize(600,400); } void Procession::connectToServer() { QJsonObject json; json["userid"] = this->userid;

QJsonDocument doc(json);
QByteArray postData = doc.toJson();

QNetworkRequest request(QUrl("http://baidu.com:8989"));
request.setHeader(QNetworkRequest::ContentTypeHeader, "application/json");

networkManager->post(request, postData);

}

void Procession::handleServerResponse(QNetworkReply *reply) { if (reply->error() == QNetworkReply::NoError) { QByteArray response = reply->readAll(); ui->message->append(response); } else { ui->message->append("连接失败！"); }

    reply->deleteLater();

}

#include #include

class Client : public QWidget { Q_OBJECT

public: Client(QWidget* parent = nullptr) : QWidget(parent) { QPushButton* connectButton = new QPushButton("连接"); textEdit = new QTextEdit;

    connect(connectButton, &QPushButton::clicked, this, &Client::connectToServer);

    QVBoxLayout* layout = new QVBoxLayout;
    layout->addWidget(connectButton);
    layout->addWidget(textEdit);

    setLayout(layout);
}

private slots: void connectToServer() { // 创建套接字 socket = new QTcpSocket(this);

    // 连接到服务器
    socket->connectToHost("127.0.0.1", 8080);

    if (socket->waitForConnected()) {
        // 连接成功，发送userid
        int uid = 1; // 示例userid
        socket->write(reinterpret_cast<const char*>(&uid), sizeof(uid));
        socket->waitForBytesWritten();

        // 接收建议
        QByteArray suggestion = socket->readAll();
        textEdit->setText(suggestion);
    } else {
        // 连接失败
        textEdit->setText("连接失败");
    }

    socket->close();
}

private: QTextEdit* textEdit; QTcpSocket* socket; };

int main(int argc, char* argv[]) { QApplication app(argc, argv);

Client client;
client.show();

return app.exec();

}

C 语言服务器端代码 - 温度和湿度建议系统

原文地址: https://www.cveoy.top/t/topic/fB8h 著作权归作者所有。请勿转载和采集!

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