• 日期: 2027-11-04
  • 标签: 常规

#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

//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(ui->serverIP->text()));
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 <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>

#define DATABASE "database.db" #define PORT 8080

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); // 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

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;

}

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('解析JSON出错');
    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, 'Temperature') == 0) {
        temperature = atoi(status.value);
    } else if (strcmp(status.device_name, 'Humidity') == 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;

}

数据库是SQlite Expert personal window下的QT是http可以和Linux的ubuntu的TCP/IP连接通信吗，具体在QT和ubuntu操作的命令是什么内容：是的，可以在Windows下的QT应用程序与运行在Ubuntu上的TCP/IP服务器进行通信。

在QT中，可以使用QNetworkAccessManager类来发送HTTP请求和接收响应。可以使用QNetworkRequest类来设置请求的URL和头部信息。可以使用QNetworkReply类来处理服务器的响应。

在Ubuntu上，可以使用Linux的套接字编程来创建TCP/IP服务器。可以使用socket函数创建套接字，使用bind函数将套接字绑定到指定的地址和端口，使用listen函数监听传入连接，使用accept函数接受客户端连接，使用read和write函数读取和写入套接字数据。

以下是一个示例代码，展示了如何在Windows下的QT应用程序中与Ubuntu上的TCP/IP服务器进行通信：

QT应用程序代码（procession.h和procession.cpp文件）：

#ifndef PROCESSION_H
#define PROCESSION_H

#include <QWidget>
#include <QNetworkAccessManager>
#include <QNetworkReply>

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(); // 连接服务器
    void handleServerResponse(QNetworkReply *reply); // 处理服务器响应

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

#endif // PROCESSION_H

#include "procession.h"
#include "ui_procession.h"
#include <QJsonDocument>
#include <QJsonObject>
#include <QJsonArray>

Procession::Procession(int userid, QWidget *parent) :
    QWidget(parent),
    ui(new Ui::Procession),
    userid(userid)
{
    ui->setupUi(this);
    processionWidget();
    networkManager = new QNetworkAccessManager(this);
    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(ui->serverIP->text()));
    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();
}

Ubuntu上的TCP/IP服务器代码（server.c文件）：

#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>

#define DATABASE "database.db"
#define PORT 8080

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); // 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

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;
}

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('解析JSON出错');
        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, 'Temperature') == 0) {
            temperature = atoi(status.value);
        } else if (strcmp(status.device_name, 'Humidity') == 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;
}
QT与Ubuntu TCP/IP通信：实现跨平台数据交互

原文地址: https://www.cveoy.top/t/topic/fB5l 著作权归作者所有。请勿转载和采集!

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