int MsgProxy::Connect( const char* pClientName ) { mWorkerName += pClientName; mMyName += pClientName; mMyName += "2"; mMyName += mServName.c_str(); CBaseWorker *pClientWorker = NULL; pClientWorker = WorkerManager::GetInstance()->GetProxyWorker( mWorkerName.c_str() ); mpClient = new FdbClient( mMyName.c_str(), pClientWorker ); mNotifyCb.Init(this); mpClient->RegNotifyCallback( &mNotifyCb ); mpClient->enableReconnect(true); mpClient->connect( mServName.c_str()); return 0; }

no matching function for call to ‘QObject::connect(QCoreApplication*, const char [15], main(int, char**)::<lambda()>)’ });

这个错误通常是因为 QObject::connect() 函数的参数不匹配导致的。该函数的第一个参数是发送信号的对象，第二个参数是信号的名称，第三个参数是接收信号的对象，第四个参数是槽函数的名称。在此错误中，由于第三个...

#include <WiFi.h> #include <WiFiClientSecure.h> #include #define MQTT_PORT (1883) const char ssid = "17group";//你的WiFi名称 const char password = "hhj20011019";//你的WiFi密码 const char mqttServer = "39.106.6.44"; const int mqttPort = 1883; const char mqttUser = "17group"; const char mqttPassword = "hhj20011019"; WiFiClient espClient; PubSubClient client(espClient);//espClient是一个WiFi客户端对象 void setup_wifi() { Serial.begin(9600); WiFi.begin(ssid, password);//链接网络 while (WiFi.status() != WL_CONNECTED) { delay(500); Serial.print("."); } Serial.println("WiFi connected!"); } void callback(char topic, byte* payload, unsigned int length) { Serial.print("Message arrived in topic: "); Serial.println(topic); Serial.print("Message:"); for (int i = 0; i < length; i++) { Serial.print((char)payload[i]); } Serial.println(); Serial.println("-----------------------"); } void reconnect() { while (!client.connected()) { Serial.println("Connecting to MQTT..."); String clientId = "esp32-" + String(random(0xffff), HEX); if (client.connect(clientId.c_str(), mqttUser, mqttPassword)) { Serial.println("Connected"); } else { Serial.print("Failed with state "); Serial.print(client.state()); delay(2000); } } } void setup() { Serial.begin(9600); setup_wifi(); client.setServer(mqttServer, mqttPort);//参数是服务器IP地址和端口 client.setCallback(callback); } void loop() { if (!client.connected()) { reconnect(); } client.loop(); char topic[100] = "test"; char payload[100] = "hello world"; //定义变量 Serial.print("Publish message: "); Serial.println(payload); //输出信息 client.publish(topic, payload); delay(1000); } 为什么连不上MQTT，该如何修改代码

2. 检查WiFi连接是否成功，可以在串口输出中查看WiFi连接状态； 3. 尝试使用WiFiClientSecure替换WiFiClient，在MQTT连接时使用secureConnect()方法，确保连接是安全的； 4. 尝试使用其他MQTT客户端库，例如Adafruit...

#include <WiFi.h> #include <WiFiClientSecure.h> #include #define MQTT_PORT (1886) const char ssid = "17group"; //你的WiFi名称 const char password = "hhj20011019"; //你的WiFi密码 const char mqttServer = "39.106.6.44"; const int mqttPort = 1886; const char mqttUser = "17group"; const char mqttPassword = "hhj20011019"; //构造函数创建对象 WiFiClient espClient; PubSubClient client(espClient) ; //espClient在这里是一个WiFi客户端对象 void setup_wifi() { Serial.begin(9600); WiFi.begin(ssid, password); //连接网络 while (WiFi.status() != WL_CONNECTED) //等待网络连接成功 { delay(500); Serial.print("."); } Serial.println("WiFi connected!"); } //定义回调函数接收信息 //回调函数，topic是主题，payload就是收到的信息 void callback(chartopic, byte* payload, unsigned int length) { Serial.print("Messagearrived in topic: "); Serial.println(topic); Serial.print("Message:"); for (int i = 0; i< length; i++) { Serial.print((char)payload[i]); } Serial.println(); Serial.println("-----------------------"); } //调用connect()函数连接云端服务器 void reconnect(){ while(!client.connected()){ Serial.println("Connectingto MQTT..."); //请将cs202112345后面的数字替换成自己的学号，这里代表客户端id if (client.connect("cs225150340",mqttUser, mqttPassword )) { Serial.println("connected"); }else { Serial.print("failedwith state "); Serial.print(client.state()); delay(2000); } } } void setup(){ Serial.begin(9600); setup_wifi();//调用setup_wifi() //补齐信息 client.setServer(mqttServer,mqttPort);//参数是服务器IP地址和端口号 client.setCallback(callback); } void loop() { if (!client.connected()) { reconnect(); } client.loop(); char topic[100] = ""; char payload[100] = ""; //定义变量 Serial.print("Publish message: "); Serial.println(payload); //输出信息 client.publish (topic,payload); }有什么错误吗？如何改进

void callback(char* topic, byte* payload, unsigned int length) { Serial.print("Message arrived in topic: "); Serial.println(topic); Serial.print("Message:"); for (int i = 0; i ; i++) { Serial....

#include<Wire.h> #include<DHT.h> #include<BH1750.h> #include<WiFi.h> #include #define sensorpin 34 #define DHTPIN 2 BH1750 lightMeter; DHT dht(DHTPIN,DHT11); char* ssid ="地生小姐你带我走吧"; const charpassword = "lzwgllhmdwx233"; const charmqttServer = "39.106.6.44"; const int mqttPort =1886; const charmqttUser = "iotlab"; const charmqttPassword = "iot20121013"; WiFiClient espClient; PubSubClient client(espClient); char msg[50]; void callback(chartopic, byte payload, unsigned int length) { Serial.print("Messagearrived in topic: "); Serial.println(topic); Serial.print("Message:"); for (int i = 0; i< length; i++) { Serial.print((char)payload[i]); } Serial.println(); Serial.println("-----------------------"); } void setup() { Serial.begin(115200); WiFi.begin(ssid,password); while (WiFi.status()!= WL_CONNECTED) { delay(500); Serial.println("Connectingto WiFi.."); } Serial.println("Connectedto the WiFi network"); client.setServer(mqttServer,mqttPort); client.setCallback(callback); while (!client.connected()){ Serial.println("Connectingto MQTT..."); if (client.connect("cs225150320",mqttUser, mqttPassword )) { Serial.println("connected"); }else { Serial.print("failedwith state "); Serial.print(client.state()); delay(2000); } } client.subscribe("sub225150320"); { Serial.begin(115200); //Initialize the I2C bus (BH1750 library doesn't do this automatically) Wire.begin(); //On esp8266 you can select SCL and SDA pins using Wire.begin(D4,D3); //For Wemos / Lolin D1 Mini Pro and the Ambient Light shield use //Wire.begin(D2,D1）； lightMeter.begin(); } } void loop() { client.loop(); float hum = dht.readHumidity() ; float temp = dht.readTemperature(); int lux = lightMeter.readLightLevel(); int soildhum = analogRead(sensorpin); snprintf(msg,50,"%.2f,%.2f,%d,%d",hum,temp,lux,soildhum); Serial.println(msg); client.publish("pub225150320", msg); delay(1000);

这段代码是一个基于 ESP8266 的物联网应用程序，使用 DHT11 温湿度传感器、BH1750 光强度传感器、土壤湿度传感器和 Wi-Fi 连接到 MQTT 服务器。其中，DHT11 和 BH1750 的数据通过串口打印输出，同时发送到 MQTT ...

下面函数第四个参数是什么意思， char https_request(const char url, const char payload, const char cert_path, const char key_path, const char ca_path) { SSL_library_init(); SSL_load_error_strings(); OpenSSL_add_all_algorithms(); // 加载 CA 证书 X509_STORE store = X509_STORE_new(); X509_LOOKUP lookup = X509_STORE_add_lookup(store, X509_LOOKUP_file()); X509_LOOKUP_load_file(lookup, ca_path, X509_FILETYPE_PEM); // 加载客户端证书和私钥 SSL_CTX ctx = SSL_CTX_new(TLS_method()); if (ctx == NULL) { perror("SSL_CTX_new"); return ("A"); } // 设置支持的协议版本为 TLSv1.2 SSL_CTX_set_min_proto_version(ctx, TLS1_2_VERSION); SSL_CTX_set_max_proto_version(ctx, TLS1_2_VERSION); //SSL_CTX ctx = SSL_CTX_new(TLSv1_2_client_method()); SSL_CTX_use_certificate_file(ctx, cert_path, SSL_FILETYPE_PEM); SSL_CTX_use_PrivateKey_file(ctx, key_path, SSL_FILETYPE_PEM); // 创建 SSL 连接 SSL ssl = SSL_new(ctx); // 解析 URL char host[256]; char path[4096]; int port = 443; if (sscanf(url, "https://%255[^/]/%4095s", host, path) != 2) { fprintf(stderr, "Error: Invalid URL\n"); return NULL; } // 创建 TCP 连接 int sockfd = socket(AF_INET, SOCK_STREAM, 0); struct sockaddr_in dest_addr; dest_addr.sin_family = AF_INET; dest_addr.sin_port = htons(port); dest_addr.sin_addr.s_addr = inet_addr(host); // 建立连接 connect(sockfd, (struct sockaddr )&dest_addr, sizeof(dest_addr)); // 将 SSL 连接和 TCP 连接关联 SSL_set_fd(ssl, sockfd); // 进行 SSL 握手 SSL_connect(ssl); // 发送 HTTPS 请求 char request[8192]; snprintf(request, sizeof(request), "POST %s HTTP/1.1\r\n" "Host: %s\r\n" "Content-Type: application/json\r\n" "Content-Length: %zu\r\n" "\r\n" "%s", path, host, strlen(payload), payload); SSL_write(ssl, request, strlen(request)); // 接收 HTTPS 响应 char buf[8192]; int bytes; size_t response_size = 0; char *response_buf = NULL; while ((bytes = SSL_read(ssl, buf, sizeof(buf))) > 0) { response_buf = realloc(response_buf, response_size + bytes + 1); memcpy(response_buf + response_size, buf, bytes); response_size += bytes; } response_buf[response_size] = '\0'; // 关闭 SSL 连接 SSL_shutdown(ssl); // 释放资源 SSL_free(ssl); close(sockfd); SSL_CTX_free(ctx); X509_STORE_free(store); ERR_free_strings(); return response_buf; }

在一些安全性要求较高的场景中，客户端需要提供自己的身份证明以便服务端进行验证。客户端证书一般由 CA 机构签发，证明了客户端的身份和可信性。该函数中使用 SSL_CTX_use_certificate_file 和 SSL_CTX_use_Private...

#include <QtWidgets> class MainWindow : public QMainWindow { Q_OBJECT public: MainWindow(QWidget parent = nullptr) : QMainWindow(parent) { QPushButton selectButton = new QPushButton("选择文件", this); connect(selectButton, &QPushButton::clicked, this, &MainWindow::selectFile); QVBoxLayout layout = new QVBoxLayout; layout->addWidget(selectButton); QWidget centralWidget = new QWidget(this); centralWidget->setLayout(layout); setCentralWidget(centralWidget); } private slots: void selectFile() { QString filePath = QFileDialog::getOpenFileName(this, "选择文件", "", "DWG Files (.dwg)"); // 处理所选文件的逻辑 } }; int main(int argc, char argv[]) { QApplication app(argc, argv); MainWindow window; window.show(); return app.exec(); } 加一个判断导入成功return ture; 导入失败 return false;

int main(int argc, char *argv[]) { QApplication app(argc, argv); MainWindow window; window.show(); return app.exec(); } #include "main.moc" 在上述代码中，我添加了一个名为importFile的函数来...

int WinsockMatTransmissionServer::socketConnect(int PORT) { WORD wVersionRequested; WSADATA wsaData; int err; wVersionRequested = MAKEWORD(1, 1); err = WSAStartup(wVersionRequested, &wsaData); if (err != 0) { return -1; } if (LOBYTE(wsaData.wVersion) != 1 || HIBYTE(wsaData.wVersion) != 1) { WSACleanup(); return -1; } SOCKET sockSrv = socket(AF_INET, SOCK_STREAM, 0); SOCKADDR_IN addrSrv; addrSrv.sin_addr.S_un.S_addr = htonl(INADDR_ANY); addrSrv.sin_family = AF_INET; addrSrv.sin_port = htons(PORT); bind(sockSrv, (SOCKADDR)&addrSrv, sizeof(SOCKADDR)); listen(sockSrv, 5); SOCKADDR_IN addrClient; int len = sizeof(SOCKADDR); sockConn = accept(sockSrv, (SOCKADDR)&addrClient, &len); int nRecvBuf = 1024 * 1024 * 10; setsockopt(sockConn, SOL_SOCKET, SO_RCVBUF, (const char*)&nRecvBuf, sizeof(int));详细解释

2. 创建一个基于IPv4协议的流式套接字。 3. 绑定套接字到指定的IP地址和端口号上。 4. 开始侦听连接请求，最多允许5个等待连接的客户端。 5. 接受客户端的连接请求，建立连接，并返回一个新的套接字描述符。 6. 设置...

char https_request(const char url, const char payload, const char cert_path, const char key_path, const char ca_path) { printf("test Register.vin "); printf("test Register.vin "); printf("test Register.vin "); printf("test Register.vin "); printf("test Register.vin "); SSL_library_init(); SSL_load_error_strings(); OpenSSL_add_all_algorithms(); // 加载 CA 证书 X509_STORE store = X509_STORE_new(); X509_LOOKUP lookup = X509_STORE_add_lookup(store, X509_LOOKUP_file()); X509_LOOKUP_load_file(lookup, ca_path, X509_FILETYPE_PEM); printf("test Register.vin "); // 加载客户端证书和私钥 SSL_CTX ctx = SSL_CTX_new(TLS_method()); if (ctx == NULL) { perror("SSL_CTX_new"); return ("A"); } printf("test Register.vin "); // 设置支持的协议版本为 TLSv1.2 SSL_CTX_set_min_proto_version(ctx, TLS1_2_VERSION); SSL_CTX_set_max_proto_version(ctx, TLS1_2_VERSION); //SSL_CTX ctx = SSL_CTX_new(TLSv1_2_client_method()); SSL_CTX_use_certificate_file(ctx, cert_path, SSL_FILETYPE_PEM); SSL_CTX_use_PrivateKey_file(ctx, key_path, SSL_FILETYPE_PEM); printf("test Register.vin "); // 创建 SSL 连接 SSL ssl = SSL_new(ctx); // 解析 URL char host[256]; char path[4096]; int port = 443; if (sscanf(url, "https://%255[^/]/%4095s", host, path) != 2) { fprintf(stderr, "Error: Invalid URL\n"); return NULL; } // 创建 TCP 连接 int sockfd = socket(AF_INET, SOCK_STREAM, 0); struct sockaddr_in dest_addr; dest_addr.sin_family = AF_INET; dest_addr.sin_port = htons(port); dest_addr.sin_addr.s_addr = inet_addr(host); // 建立连接 connect(sockfd, (struct sockaddr )&dest_addr, sizeof(dest_addr)); // 将 SSL 连接和 TCP 连接关联 SSL_set_fd(ssl, sockfd); // 进行 SSL 握手 SSL_connect(ssl); // 发送 HTTPS 请求 printf("test Register.vin "); char request[8192]; snprintf(request, sizeof(request), "POST %s HTTP/1.1\r\n" "Host: %s\r\n" "Content-Type: application/json\r\n" "Content-Length: %zu\r\n" "\r\n" "%s", path, host, strlen(payload), payload); SSL_write(ssl, request, strlen(request)); // 接收 HTTPS 响应 char buf[8192]; int bytes; size_t response_size = 0; char *response_buf = NULL; while ((bytes = SSL_read(ssl, buf, sizeof(buf))) > 0) { response_buf = realloc(response_buf, response_size + bytes + 1); memcpy(response_buf + response_size, buf, bytes); response_size += bytes; } response_buf[response_size] = '\0'; // 关闭 SSL 连接 SSL_shutdown(ssl); // 释放资源 SSL_free(ssl); close(sockfd); SSL_CTX_free(ctx); X509_STORE_free(store); ERR_free_strings(); printf("test Register.vin : %s\n", response_buf); return response_buf; } 怎么调用上面的函数，给出示例

char payload[] = "{\"name\":\"John Doe\",\"age\":30}"; char cert_path[] = "/path/to/client/cert.pem"; char key_path[] = "/path/to/client/key.pem"; char ca_path[] = "/path/to/ca/cert.pem"; char *...

char url = "https://otaapi-sit.lotuscars.com.cn/v50/vehicle/api/register"; char escaped_url = urlencode(url); char request = (char )malloc(strlen(escaped_url) + 100); sprintf(request, "GET %s HTTP/1.1\r\nHost: %s\r\n\r\n", escaped_url, escaped_url); //发送HTTP请求 //... free(escaped_url); free(request);上面的c代码是不是需要调整如果用https通信的话

SSL_CTX *ctx = SSL_CTX_new(TLSv1_2_client_method()); // 创建SSL套接字 int sockfd = socket(AF_INET, SOCK_STREAM, 0); struct sockaddr_in serveraddr = {0}; serveraddr.sin_family = AF_INET; serveraddr....

#define sensorpin 34 #define DHTPIN 2 #include <BH1750.h> BH1750 lightMeter; #include <Wire.h> #include <DHT.h> DHT dht(DHTPIN, DHT11); #include<WiFi.h> #include char* ssid ="17group";//此处需要改成你的wifi名称 const charpassword = "hhj20011019"; //你的wifi密码 //以下四行参数勿动 const charmqttServer = "39.106.6.44"; const int mqttPort =1886; const charmqttUser = "iotlab"; const charmqttPassword = "iot20121013"; WiFiClient espClient; PubSubClient client(espClient); char msg[50]; //用于存储向外发送的消息 //回调函数，topic是主题，payload就是收到的信息 void callback(chartopic, byte payload, unsigned int length) { Serial.print("Messagearrived in topic: "); Serial.println(topic); Serial.print("Message:"); for (int i = 0; i< length; i++) { Serial.print((char)payload[i]); } Serial.println(); Serial.println("-----------------------"); } void setup() { Serial.begin(115200); WiFi.begin(ssid,password); while (WiFi.status()!= WL_CONNECTED) { delay(500); Serial.println("Connectingto WiFi.."); } Serial.println("Connectedto the WiFi network"); client.setServer(mqttServer,mqttPort); client.setCallback(callback); while (!client.connected()){ Serial.println("Connectingto MQTT..."); //请将cs202112345后面的数字替换成自己的学号 if (client.connect("cs225150340",mqttUser, mqttPassword )) { Serial.println("connected"); }else { Serial.print("failedwith state "); Serial.print(client.state()); delay(2000); } } client.subscribe("sub225150340");//请将后面的数字替换成自己的学号 { Serial.begin(115200); // Initialize the I2C bus (BH1750 library doesn't do this automatically) Wire.begin(); // On esp8266 you can select SCL and SDA pins using Wire.begin(D4, D3); // For Wemos / Lolin D1 Mini Pro and the Ambient Light shield use // Wire.begin(D2, D1); lightMeter.begin(); } } void loop() { client.loop();//此句为循环监测是否有消息过来，勿删 //以下是发送一组数据的例子,实际场景替换成读取的传感器数值 float hum = dht.readHumidity(); float temp = dht.readTemperature(); float lux = lightMeter.readLightLevel(); int soilhum =analogRead(sensorpin); snprintf(msg,50,"%.2f,%.2f,%.1f,%d",hum,temp,lux,soildhum); Serial.println(msg); //这行只是为了调试用 client.publish("pub225150430", msg); //请将后面的数字替换成自己的学号 delay(1000); } 如何接收 #define sensorpin 34 int svalue; void setup(){ Serial.begin(9600); } void loop(){ svalue=analogRead(sensorpin); Serial.println(svalue); delay(1000); } 上的数据

void callback(char* topic, byte* payload, unsigned int length) { Serial.print("Message arrived in topic: "); Serial.println(topic); Serial.print("Message:"); for (int i = 0; i ; i++) { ...

本关的编程任务是完成客户端的代码编写，补全右侧代码片段localsocket_test中Begin至End中间的代码，具体要求如下：首先建立一个命名 socket ，指定地址为./socket_test；连接 socket 成功后，发送消息(发送内容为 localsocket_test 中的参数 buffer)到服务端；接收从服务端来的消息。关闭 socket ；如果接收成功返回 0，接受失败返回 -1。#include <stdio.h> #include <unistd.h> #include <string.h> #include <sys/types.h> #include <sys/socket.h> #include <sys/un.h> int localsocket_test(const char buffer, char recv_buff, int length) { /***begin*/ /end******/ }

int localsocket_test(const char *buffer, char *recv_buff, int length) { int sockfd = socket(AF_UNIX, SOCK_STREAM, 0); if (sockfd ) { perror("Error opening socket"); return -1; } struct sockaddr_...

解释一下这段代码char address = "tcp://127.0.0.1:1234"; char client_id = "MQTT_FX_Client2"; char topic = "PHM/Topics/WaveData/111"; std::string strResult; strResult = writer.write(root); const int time_out = 10000; int rv; int QOS = 1; MQTTClient client; MQTTClient_connectOptions conn_opts = MQTTClient_connectOptions_initializer; MQTTClient_message publish_msg = MQTTClient_message_initializer; MQTTClient_message publish_msg1 = MQTTClient_message_initializer; MQTTClient_deliveryToken token; conn_opts.keepAliveInterval = 60; conn_opts.cleansession = 1; MQTTClient_create(&client, address, client_id, MQTTCLIENT_PERSISTENCE_NONE, nullptr); if ((rv = MQTTClient_connect(client, &conn_opts)) != MQTTCLIENT_SUCCESS) { printf("MQTTClient_connect failure:%s\n", strerror(errno)); return 0; } publish_msg1.qos = QOS; publish_msg1.retained = 0; while (1) { printf("enter the message you want to send\n"); publish_msg1.payload = (void)strResult.c_str(); publish_msg1.payloadlen = strResult.size(); MQTTClient_publishMessage(client, topic, &publish_msg1, &token); //客户端应用程序调用此函数来将主线程的执行与消息的完成发布同步 rv = MQTTClient_waitForCompletion(client, token, time_out); printf("Message with delivery token %d delivered\n", rv); printf("%s\n", strResult.c_str()); sleep(3); }

const int time_out = 10000; 设置等待消息发布完成的超时时间（以毫秒为单位）。 c++ int rv; int QOS = 1; 定义变量用于存储函数返回值和消息的服务质量等级。 c++ MQTTClient client; MQTTClient...

// 若对方发送方式是字节流，则会进入此函数 void mqMsgHandleByte(const char* data, int size) { //监听飞仿发送的遥测数据包 if (size == sizeof(struct FlySARCtrlStatus)) { MqMessage::getMqMessageInstance().setFlyCtrStatus((FlySARCtrlStatus)data); } void MqMessage::setFlyCtrStatus(FlySARCtrlStatus flyControlStatus) { this->flyControlStatus = flyControlStatus; } FlySARCtrlStatus MqMessage::getFlyCtrStatus() { return this->flyControlStatus; } QTime time; QTimer* tim; tim = new QTimer(this); tim->setInterval(100); tim->start(); connect(tim, SIGNAL(timeout()), this, SLOT(ChangeStateFly())); void load_radar::ChangeStateFly() { //QString::number(str_fly.flyheight)将 str_fly.flyheight 转换为字符串类型 //获取到飞行状态信息 //结构体类型对象 FlySARCtrlStatus str_fly = MqMessage::getFlyMqMessage().getFlyCtrStatus(); ui.labShowPlaneSpeed->setText(QString::number(str_fly.groundspeed) + "Km/h"); }有问题请修改

void mqMsgHandleByte(const char* data, int size) { // 监听飞仿发送的遥测数据包 if (size == sizeof(struct FlySARCtrlStatus)) { FlySARCtrlStatus flyControlStatus = *(FlySARCtrlStatus*)data; // ...

下面的代码修改一下需要支持https双向认证int https_post(const char cert_path, const char url, const char body, char response) { int sockfd, len; struct sockaddr_in dest; struct hostent host; SSL_CTX ctx; SSL ssl; char request[MAX_BUF_SIZE], buf[MAX_BUF_SIZE]; // 初始化OpenSSL库 SSL_library_init(); SSL_load_error_strings(); OpenSSL_add_all_algorithms(); // 解析主机名 //printf("66666666 %s\n", url); char hostname[2560]; getHostFromURL(url, hostname); host = gethostbyname(hostname); if (host == NULL) { perror("gethostbyname"); return -1; } // 创建套接字 sockfd = socket(AF_INET, SOCK_STREAM, 0); if (sockfd < 0) { perror("socket"); return -1; } // 设置目标地址 bzero(&dest, sizeof(dest)); dest.sin_family = AF_INET; dest.sin_port = htons(443); dest.sin_addr.s_addr = (long)host->h_addr; // 连接服务器 if (connect(sockfd, (struct sockaddr)&dest, sizeof(dest)) != 0) { perror("connect"); return -1; } ctx = SSL_CTX_new(TLS_method()); // 设置支持的协议版本为 TLSv1.2 SSL_CTX_set_min_proto_version(ctx, TLS1_2_VERSION); SSL_CTX_set_max_proto_version(ctx, TLS1_2_VERSION); if (ctx == NULL) { perror("SSL_CTX_new"); return -1; } // 加载证书 if (SSL_CTX_load_verify_locations(ctx, cert_path, NULL) != 1) { perror("SSL_CTX_load_verify_locations"); return -1; } // 创建SSL ssl = SSL_new(ctx); if (ssl == NULL) { perror("SSL_new"); return -1; } // 将套接字绑定到SSL SSL_set_fd(ssl, sockfd); // SSL握手 if (SSL_connect(ssl) == -1) { perror("SSL_connect"); return -1; } // 构造HTTP请求 char *escaped_url = urlencode(url); sprintf(request, "POST / HTTP/1.1\r\n" "Host: %s\r\n" "Content-Type: application/json\r\n" "Content-Length: %d\r\n" "\r\n" "%s", escaped_url, strlen(body), body); // 发送HTTP请求 SSL_write(ssl, request, strlen(request)); // 接收HTTP响应 len = SSL_read(ssl, buf, MAX_BUF_SIZE); printf("response %s\n", buf); // 关闭SSL和套接字 SSL_free(ssl); close(sockfd); // 处理响应 strncpy(response, buf, len); printf("Child process created with PID %d\n", 60909); response[len] = '\0'; printf("Child process created with PID %d\n", 70909); // 清理OpenSSL库 SSL_CTX_free(ctx); EVP_cleanup(); printf("Child process created with PID %d\n", 909); free(escaped_url); return 0; }

int https_post(const char *cert_path, const char *key_path, const char *url, const char *body, char *response) { int sockfd, len; struct sockaddr_in dest; struct hostent *host; SSL_CTX *ctx; SSL ...

根据myData::myData() { //数据库的打开就可以了 int res = sqlite3_open("./data/user.db", &this->mydb); if (res == SQLITE_OK) { cout << "数据库打开success" << endl; this->creatData(); } else { cout << sqlite3_errmsg(this->mydb); } } 、myData* myData::getMyData() { if (myData::intence == nullptr) { myData::intence = new myData;//懒汉模式：需要的时候才准备的 } return myData::intence; } void myData::creatData() { char errmsg = nullptr; char sql[] = "create table if not exists user (account text not null,password text not null);" "create table if not exists car (cpn text not null,time text not null);"; int ret = sqlite3_exec(this->mydb, sql, NULL, NULL, &errmsg); if (ret == SQLITE_OK) { cout << "exec ok" << endl; } else { cout << "exec error" << endl; cout << sqlite3_errmsg(this->mydb); sqlite3_free(errmsg); } }、void myData::getData_exec(const char sql, int& row, int& col, char**& qress) { char* errmsg = nullptr; int res = sqlite3_get_table(this->mydb, sql, &qress, &row, &col, &errmsg); if (res == SQLITE_OK) { } else { cout << sqlite3_errmsg(this->mydb); sqlite3_free(errmsg); } }修改void CTool::load_data_from_db() { // 连接数据库 db = new Database("localhost", "root", "password", "mydb"); db->connect(); // 读取数据 vector<Record> data = db->query("SELECT * FROM mytable"); // 填充控件 for (auto ctrl : ctrlArry) { if (ctrl->getType() == CtrlType::TEXTBOX) { // 如果是文本框，设置文本内容 dynamic_cast<TextBox>(ctrl)->setText(data[0].getString("textbox_value")); } else if (ctrl->getType() == CtrlType::COMBOBOX) { // 如果是下拉框，添加选项 for (auto option : data[0].getStringList("combobox_options")) { dynamic_cast<ComboBox>(ctrl)->addItem(option); } } else if (ctrl->getType() == CtrlType::LISTBOX) { // 如果是列表框，添加行数据 for (auto row : data) { dynamic_cast(ctrl)->addRow(row.getString("listbox_value")); } } } // 断开数据库连接 db->disconnect(); delete db; }

这段代码涉及到了数据库的操作，原来的代码使用了sqlite3库进行操作，而修改后的代码使用了一个名为Database的类进行操作。具体来说，原来的代码中myData类的构造函数打开了名为user.db的数据库，并在其中创建了两张...

指出下面代码的问题运行出现了段错误 #include <openssl/ssl.h> #include <openssl/bio.h> #include <stdio.h> #include <stdlib.h> #include <unistd.h> #include <string.h> #include <netinet/in.h> #include <netdb.h> #include <sys/socket.h> #include <openssl/err.h> void parse_url(char url, char protocol, char domain, char path) { char ptr; if (strncmp(url, "http://", 7) == 0) { strcpy(protocol, "http"); ptr = url + 7; } else if (strncmp(url, "https://", 8) == 0) { strcpy(protocol, "https"); ptr = url + 8; } else { strcpy(protocol, ""); ptr = url; } char domain_end = strstr(ptr, "/"); if (domain_end == NULL) { strcpy(domain, ptr); strcpy(path, ""); } else { int len = domain_end - ptr; strncpy(domain, ptr, len); domain[len] = '\0'; strcpy(path, domain_end); } } int https_communication(char url, char message, char response) { int sockfd, err; struct sockaddr_in serv_addr; struct hostent server; SSL_CTX ctx; SSL ssl; char buf[1024]; printf("test1111 " ); // 创建socket sockfd = socket(AF_INET, SOCK_STREAM, 0); if (sockfd < 0) { perror("ERROR opening socket"); return -1; } // 获取主机信息 server = gethostbyname(url); printf("test1111 " ); if (server == NULL) { perror("ERROR, no such host"); return -1; } // 设置服务地址 printf("test1111 " ); bzero((char ) &serv_addr, sizeof(serv_addr)); serv_addr.sin_family = AF_INET; bcopy((char )server->h_addr, (char )&serv_addr.sin_addr.s_addr, server->h_length); serv_addr.sin_port = htons(443); printf("test222 " ); // 连接服务器 if (connect(sockfd,(struct sockaddr ) &serv_addr,sizeof(serv_addr)) < 0) { perror("ERROR connecting"); return -1; } // 初始化SSL SSL_library_init(); ctx = SSL_CTX_new(TLS_method()); if (ctx == NULL) { perror("SSL_CTX_new"); return (-1); } // 设置支持的协议版本为 TLSv1.2 SSL_CTX_set_min_proto_version(ctx, TLS1_2_VERSION); SSL_CTX_set_max_proto_version(ctx, TLS1_2_VERSION); //ctx = SSL_CTX_new(TLSv1_2_client_method()); if (ctx == NULL) { perror("ERROR creating SSL context"); return -1; } printf("test1111 " ); // 创建SSL套接字 ssl = SSL_new(ctx); SSL_set_fd(ssl, sockfd); // SSL握手 err = SSL_connect(ssl); if (err < 0) { perror("ERROR performing SSL handshake"); return -1; } printf("test1111 " ); // 发送消息 char request[1024]; sprintf(request, "GET %s HTTP/1.1\r\nHost: %s\r\n\r\n", message, url); err = SSL_write(ssl, request, strlen(request)); if (err < 0) { perror("ERROR writing to socket"); return -1; } printf("test1111 " ); // 接收响应 bzero(buf, sizeof(buf)); err = SSL_read(ssl, buf, sizeof(buf)-1); if (err < 0) { perror("ERROR reading from socket"); return -1; } printf("test1111999999999 " ); strcpy(response, buf); // 关闭SSL套接字 SSL_free(ssl); SSL_CTX_free(ctx); // 关闭socket close(sockfd); return 0; } int main() { //char url = "https://otaapi-sit.lotuscars.com.cn/v50/vehicle/api/register"; //char protocol[10], domain[100], path[1000]; //parse_url(url, protocol, domain, path); //printf("protocol: %s\n", protocol); //printf("domain: %s\n", domain); //printf("path: %s\n", path); char url = "otaapi-sit.lotuscars.com.cn"; //const char cert_path="/home/pi/Cdaima/certDHU.pem"; char payload= "{"timestamp":1685523498,"sdkVersion":"1.0.30_1","vin":"LJUBMSA24PKFFF198","sign":"696c3034f04f2bd80c8929089a0deea8cf4812574b002a555f8af663e500c4ce"}"; char *response=NULL; //https_request(cert_path,payload,url) ; //gethostbyname(url); https_communication(url, payload, response); return 0; }

2. parse_url函数中的path参数类型应该是字符数组类型而不是字符类型。 3. parse_url函数中的domain_end变量应该是字符指针类型而不是字符类型。 4. parse_url函数中的path参数应该使用strcpy函数而不是赋值操作。...

补全这段代码#include <sys/socket.h> #include <netinet/in.h> /* 创建一个套接字 / int socket(int domain, int type, int protocol); / 绑定套接字到指定地址和端口 / int bind(int sockfd, const struct sockaddr addr, socklen_t addrlen); /* 监听来自客户端的连接 / int listen(int sockfd, int backlog); / 接受客户端的连接请求 / int accept(int sockfd, struct sockaddr addr, socklen_t addrlen); /* 发送数据 / ssize_t send(int sockfd, const void buf, size_t len, int flags); /* 接收数据 / ssize_t recv(int sockfd, void buf, size_t len, int flags); /* 关闭套接字 / int close(int fd); / 连接到指定的服务器 / int connect(int sockfd, const struct sockaddr addr, socklen_t addrlen);

int main(int argc, char *argv[]) { int sockfd, connfd; struct sockaddr_in servaddr, cliaddr; socklen_t cliaddr_len; char buffer[MAX_MSG_SIZE]; // 创建套接字 sockfd = socket(AF_INET, SOCK_STREAM...

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