当前位置： 首页 > news >正文

学习嵌入式的第三十八天

news 2025/8/27 5:52:20

文章目录

  • 天气查询
    • 1.实现原理和实现目标
      • 1.原理
      • 2.目标
      • 3.实现方法
        • 1.头文件
        • 2.界面函数
        • 3.输出函数
        • 4.主函数
      • 附：使用cjson分割

天气查询

1.实现原理和实现目标

1.原理

  • 利用TCP协议连接到api.k780.com网站中查询信息并打印到终端

2.目标

  • 用户输入想要查询的城市，再输入想要查询的日期
  • 打印出对应的天气情况
  • 对于历史天气不支持查询

3.实现方法

1.头文件
#ifndef _HEAD_H_
#define _HEAD_H_#include<stdio.h>
#include<stdlib.h>
#include<string.h>
#include<unistd.h>
#include<arpa/inet.h>
#include<pthread.h>
#include<sys/types.h>
#include<sys/socket.h>
#include<signal.h>
#include<sys/wait.h>
#include<fcntl.h>
#include<errno.h>
#include<time.h>
#include<netinet/in.h>extern void get_local_info(char *ptmp);
extern char* menu_show(void);
extern int menu_select(void);
extern void what_day(void);
extern char* log_in(char *addr);
extern int get_future_weather(char *ptmp);#endif
2.界面函数

  • 展示出应用界面，引导用户输入

  • 将用户输入的城市名和查询方式拼接到URL中

    代码实现：

    #include"head.h"char* menu_show(void){static char addr[1024] = {0};char name[20] = {0};printf("******************************\n");printf("*         天气查询系统       *\n");printf("*     请输入你要查询的城市   *\n");printf("*        输入0退出系统       *\n");printf("******************************\n");scanf("%s",name);if(strcmp(name,"0") == 0){return "quit";}sprintf(addr,"&weaid=%s&appkey=77265&sign=6856d5882decbc6dcd42d8181fd613fc&format=json HTTP/1.1\r\nHost: api.k780.com\r\n\r\n",name);return addr;
}
void what_day(void){printf("******************************\n");printf("*         天气查询系统       *\n");printf("*     输入编号查询对应天气   *\n");printf("*     输入0退出此界面        *\n");printf("*     1.查询当天天气         *\n");printf("*     2.查询未来天气         *\n");printf("*     3.查询历史天气(未开放) *\n");printf("******************************\n");return;
}
int menu_select(void){int select = 0;scanf("%d",&select);switch(select){case 0:return 0;break;case 1:return 1;break;case 2:return 2;break;case 3:return 3;break;}
}
3.输出函数

  • 将拼接好的URL接入到网站中，并将网站返回的信息返回

  • 根据查询方式输出

    代码实现：

    #include"head.h"char* log_in(char *addr){int fd;char tmp[4096] = {0};static char buf[4096] = {0};fd = socket(AF_INET, SOCK_STREAM, 0);if (fd < 0) {perror("socket");return NULL;}struct sockaddr_in seraddr;seraddr.sin_family = AF_INET;seraddr.sin_port = htons(80);seraddr.sin_addr.s_addr = inet_addr("103.205.5.249");if(connect(fd, (struct sockaddr *)&seraddr, sizeof(seraddr))<0){perror("fail to connect");return NULL;}strcpy(tmp,addr);if(strcmp(tmp,"quit") == 0){close(fd);return NULL;}write(fd,tmp, strlen(tmp));int n = read(fd,buf,sizeof(buf)-1);if(n > 0) buf[n] = '\0';close(fd);return buf;
}void get_local_info(char *ptmp){char buf[4096] = {0};char *p = NULL;printf("今日天气预报：\n");printf("-------------------------\n");strcpy(buf,ptmp);p = strstr(buf,"citynm");p += 9;strtok(p,"\"");printf("城市：%s\n",p);strcpy(buf,ptmp);p = strstr(buf,"temperature");p += 14;strtok(p,"\"");printf("今日温度：%s\n",p);strcpy(buf,ptmp);p = strstr(buf,"temperature_curr");p += 19;strtok(p,"\"");printf("现在温度：%s\n",p);strcpy(buf,ptmp);p = strstr(buf,"weather");p += 10;strtok(p,"\"");printf("天气：%s\n",p);strcpy(buf,ptmp);p = strstr(buf,"wind");p += 7;strtok(p,"\"");printf("风向：%s\n",p);strcpy(buf,ptmp);p = strstr(buf,"winp");p += 7;strtok(p,"\"");printf("风速：%s\n",p);printf("-------------------------\n");return;
}
int get_future_weather(char *ptmp) {char *q = ptmp;char info[1024] = {0};char buf[4096] = {0};char *p = NULL;printf("未来几天天气预报：\n");printf("-------------------------\n");while ((q = strstr(q, "\"weaid\":")) != NULL) {q += 8;sscanf(q, "%[^}]", info);strcpy(buf, info);p = strstr(buf, "days");if (p) {p += 7;strtok(p, "\"");printf("%s\n", p);}strcpy(buf, info);p = strstr(buf, "week");if (p) {p += 7;strtok(p, "\"");printf("%s\n", p);}strcpy(buf, info);p = strstr(buf, "citynm");if (p) {p += 9;strtok(p, "\"");printf("城市：%s\n", p);}strcpy(buf, info);p = strstr(buf, "temperature");if (p) {p += 14;strtok(p, "\"");printf("温度：%s\n", p);}strcpy(buf, info);p = strstr(buf, "humidity");if (p) {p += 11;strtok(p, "\"");printf("湿度：%s\n", p);}strcpy(buf, info);p = strstr(buf, "weather");if (p) {p += 10;strtok(p, "\"");printf("天气：%s\n", p);}strcpy(buf, info);p = strstr(buf, "wind");if (p) {p += 7;strtok(p, "\"");printf("风向：%s\n", p);}strcpy(buf, info);p = strstr(buf, "winp");if (p) {p += 7;strtok(p, "\"");printf("风速：%s\n", p);}printf("-------------------------\n");q++;}return 0;
}
4.主函数

代码实现：

#include"head.h"int main(void){int num = 0;char *addr;char type[20];char req[4096];char *tmp = NULL;while(1){addr = menu_show();if(strcmp(addr,"quit") == 0){printf("感谢使用，再见！\n");break;}what_day();num = menu_select();switch(num){case 0:break;case 1:strcpy(type,"today");sprintf(req,"GET /?app=weather.%s",type);strcat(req,addr);tmp = log_in(req);get_local_info(tmp);break;case 2:strcpy(type,"future");sprintf(req,"GET /?app=weather.%s",type);strcat(req,addr);tmp = log_in(req);get_future_weather(tmp);break;case 3:printf("功能未开放，敬请期待！\n");break;}
}return 0;
}

附：使用cjson分割

  • 也可以使用cjson分割网站返回的信息

  • 需要加上cjson自带的cJSON.h和cJSON.c函数

  • 获取这两个函数可以访问GitHub上的网址

    https://github.com/DaveGamble/cJSON

  • 把函数加上之后只需要修改输出函数即可

    #include"head.h"
#include"cJSON.h"char* log_in(char *addr){int fd;char tmp[4096] = {0};static char buf[4096] = {0};fd = socket(AF_INET, SOCK_STREAM, 0);if (fd < 0) {perror("socket");return NULL;}struct sockaddr_in seraddr;seraddr.sin_family = AF_INET;seraddr.sin_port = htons(80);seraddr.sin_addr.s_addr = inet_addr("103.205.5.249");if(connect(fd, (struct sockaddr *)&seraddr, sizeof(seraddr))<0){perror("fail to connect");return NULL;}strcpy(tmp,addr);if(strcmp(tmp,"quit") == 0){close(fd);return NULL;}write(fd,tmp, strlen(tmp));int n = read(fd,buf,sizeof(buf)-1);if(n > 0) buf[n] = '\0';close(fd);return buf;
}void get_local_info(char *ptmp){cJSON *root = NULL;char *json_start = strstr(ptmp, "{");json_start = strstr(json_start+1,"{");if (json_start != NULL) {char *json_end = strrchr(json_start,'}');if(json_end != NULL){*(json_end) = '\0';}}root = cJSON_Parse(json_start);if(root == NULL){const char *error_ptr = cJSON_GetErrorPtr();if(error_ptr != NULL){fprintf(stderr,"Error before: %s\n",error_ptr);}return;}cJSON *city_item = cJSON_GetObjectItem(root,"citynm");if(cJSON_IsString(city_item)){printf("城市：%s\n",city_item->valuestring);}cJSON *temperature_item = cJSON_GetObjectItem(root,"temperature");if(cJSON_IsString(temperature_item)){printf("温度：%s\n",temperature_item->valuestring);}cJSON *temperature_curr_item = cJSON_GetObjectItem(root,"temperature_curr");if(cJSON_IsString(temperature_curr_item)){printf("当前温度：%s\n",temperature_curr_item->valuestring);}cJSON *weather_item = cJSON_GetObjectItem(root,"weather");if(cJSON_IsString(weather_item)){printf("天气：%s\n",weather_item->valuestring);}cJSON *wind_item = cJSON_GetObjectItem(root,"wind");if(cJSON_IsString(wind_item)){printf("风向：%s\n",wind_item->valuestring);}cJSON *winp_item = cJSON_GetObjectItem(root,"winp");if(cJSON_IsString(winp_item)){printf("风速：%s\n",winp_item->valuestring);}return;
}
int get_future_weather(char *ptmp) {cJSON *root = NULL;char *json_end;char *json_start;int i = 0;for(i = 0;i<7;i++){printf("--------------------------------------\n");if(i == 0){json_start = strstr(ptmp, "{");json_start = strstr(json_start+1,"{");if (json_start != NULL) {json_end = strstr(json_start,"}");if(json_end != NULL){*(json_end+1) = '\0';}}json_end ++;json_end ++;}else{json_start = json_end;//printf("json_start = %s\n",json_start);if (json_start != NULL) {json_end = strstr(json_start,"}");if(json_end != NULL){*(json_end+1) = '\0';}}json_end ++;json_end ++;}root = cJSON_Parse(json_start);if(root == NULL){const char *error_ptr = cJSON_GetErrorPtr();if(error_ptr != NULL){fprintf(stderr,"Error before: %s\n",error_ptr);}return -1;}cJSON *date_item = cJSON_GetObjectItem(root,"days");if(cJSON_IsString(date_item)){printf("日期：%s\n",date_item->valuestring);}cJSON *week_item = cJSON_GetObjectItem(root,"week");if(cJSON_IsString(week_item)){printf("星期：%s\n",week_item->valuestring);}cJSON *city_item = cJSON_GetObjectItem(root,"citynm");if(cJSON_IsString(city_item)){printf("城市：%s\n",city_item->valuestring);}cJSON *temperature_item = cJSON_GetObjectItem(root,"temperature");if(cJSON_IsString(temperature_item)){printf("温度：%s\n",temperature_item->valuestring);}cJSON *humidity_item = cJSON_GetObjectItem(root,"humidity");if(cJSON_IsString(humidity_item)){printf("当前湿度：%s\n",humidity_item->valuestring);}cJSON *weather_item = cJSON_GetObjectItem(root,"weather");if(cJSON_IsString(weather_item)){printf("天气：%s\n",weather_item->valuestring);}cJSON *wind_item = cJSON_GetObjectItem(root,"wind");if(cJSON_IsString(wind_item)){printf("风向：%s\n",wind_item->valuestring);}cJSON *winp_item = cJSON_GetObjectItem(root,"winp");if(cJSON_IsString(winp_item)){printf("风速：%s\n",winp_item->valuestring);}}return 0;
}
http://www.dtcms.com/a/351239.html

相关文章：

  • 【网络安全】XSS漏洞——PortSwigger靶场-DOM破坏
  • 常见的 Loader 和 Plugin？
  • 观察者模式 (Observer Pattern)与几个C++应用例子
  • Visual Basic 数据类型应用示例
  • EasyExcel 3.x 导出动态表头，动态sheet页
  • 国产化Excel开发组件Spire.XLS教程：Python 读取 CSV 文件，从基础到进阶指南
  • C shell 学习
  • AI出题人给出的Java后端面经（二十仨）（不定更）
  • 线性代数中矩阵等价与离散数学中关系的闭包之间的关联
  • dapo：开源大规模llm强化学习系统的突破与实现
  • AI提示词30天入门培训计划
  • STM32物联网项目---ESP8266微信小程序结合OneNET平台MQTT实现STM32单片机远程智能控制---MQTT篇（三）
  • 【密集目标检测】停车场车辆（车位）识别数据集：12k+图像，yolo标注
  • 从GPT-5发布来分析LLM大模型幻觉收敛（一）
  • 广告网站与Coze智能体集成
  • 节能率的图表组件的选择
  • MT** 时间指标全景图：从可靠性到可维护性的度量体系
  • PEFT 模型解析（59）
  • Linux 详谈库制作与原理
  • python中生成器
  • 解决qt5.9.4和2015配置xilinx上位机报错问题
  • 学习游戏制作记录（保存装备物品技能树和删除存档文件）8.26
  • 【软考论文】论静态测试方法及其应用
  • 系统设计中的幂等性
  • QPSK调制解调通信仿真程序调试与分析
  • UbuntuV24.04安装mpdecimal库（libmpdec），从源码编译
  • 广告推荐模型3：域感知因子分解机（Field-aware Factorization Machine, FFM）
  • 机器人 - 无人机基础(6) - 状态估计(ing)
  • 1 线性模型
  • 支持向量机（SVM）